JURNAL SUMBER DAYA AIR最新文献

{"title":"KAJIAN SEBARAN SALINITAS DENGAN MODEL HEC-RAS DI DAERAH IRIGASI TAMBAK SEI TERAS KALIMANTAN TENGAH","authors":"Hanny Adityanta Hermawanto","doi":"10.32679/jsda.v19i2.834","DOIUrl":"https://doi.org/10.32679/jsda.v19i2.834","url":null,"abstract":"ABSTRACTThis study aims to evaluate the distribution of salinity with a mathematical model to enhance advanced aquaculture cultivation. The Sei Teras Fishpond Irrigation Area is one of the aquaculture development areas of the food security program (Food Estate) influenced by tides. Currently, the technology used is simple, and the availability of seeds and feeds depends on nature. The water quality parameters with a specific threshold are needed as an advanced aquaculture requirement to achieve the production level. Vannamei shrimp, as a development commodity, requires a salinity concentration of 15-25 ppt for optimal growth. This study will evaluate the potential of salinity from alternative schemes of introducing gates and normalization against existing conditions using the HEC-RAS program. This program can resolve water quality models with a hydrodynamic simulation procedure through a series of mathematical equations. The simulation results show that the availability of salinity in the two tidal cycles of the spring tide and neap tide could fulfill around 86.7% for 15 days. The normalization has no significant impact on the availability of salinity against existing conditions. The gate influences the longitudinal distribution pattern of salinity. The salinity value above 19 ppt could reach the upstream of the canal up to ± 7 km, while the existing condition could only reach ± 4 km. Therefore, the expected potential of salinity could be achieved.Keywords: salinity, model simulation, distribution, an alternative scheme ABSTRAKKajian ini bertujuan untuk mengevaluasi sebaran salinitas dengan model matematis dalam upaya meningkatkan teknik budidaya akuakultur maju. Daerah Irigasi Tambak Sei Teras merupakan salah satu wilayah pengembangan budidaya perairan dalam program ketahanan pangan (Food Estate) yang dipengaruhi oleh pasang surut air laut. Teknik budidaya saat ini tergolong tradisional dengan benih dari alam. Dalam upaya pengembangan ke level budidaya maju diperlukan parameter kualitas air dengan ambang tertentu agar produksi yang diharapkan dapat tercapai. Udang vaname sebagai komoditas pengembangan membutuhkan konsentrasi salinitas 15-25 ppt untuk tumbuh optimal. Pada kajian ini akan mengevaluasi potensi salinitas dari kondisi eksisting dan beberapa skema alternatif seperti pembangunan pintu air dan normalisasi saluran menggunakan HEC-RAS. Sebuah aplikasi yang dapat digunakan untuk menyelesaikan model kualitas air dengan pendekatan simulasi hidrodinamik melalui serangkaian persamaan matematik. Hasil simulasi eksisting menunjukkan bahwa ketersediaan salinitas pada dua siklus pasang surut spring tide dan neap tide dapat memenuhi sekitar 86,7% selama 15 hari pada dua kondisi pasang surut. Normalisasi saluran tidak berdampak signifikan terhadap ketersediaan salinitas dibanding kondisi eksisting. Adanya pintu air berpengaruh terhadap pola sebaran salinitas secara memanjang. Salinitas dengan nilai tinggi diatas 19 ppt dapat menjangkau hulu saluran ","PeriodicalId":409496,"journal":{"name":"JURNAL SUMBER DAYA AIR","volume":"206 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135927991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"KOMBINASI PREDIKSI VOLUME SEDIMEN MENGGUNAKAN METODE HECRAS-USLE UNTUK MENDUKUNG KONSERVASI DAS LAMBIDARO PALEMBANG, SUMATERA SELATAN","authors":"Masri Nur Sultan, Mohammad Farid, Adi Prasetyo, Muhammad Syahril Badri Kusuma, Dantje Kardana Natakusumah","doi":"10.32679/jsda.v19i2.851","DOIUrl":"https://doi.org/10.32679/jsda.v19i2.851","url":null,"abstract":"ABSTRACT Over the past ten years, flooding has been the most frequent problem in South Sumatra Province, Indonesia. As the capital of South Sumatra Province, Palembang City faces similar problems, where Lambidaro Watershed is the watershed with the highest 25-year potential flood discharge in Palembang City. One of the causes of flooding is the lack of river channel capacity related to land erosion in the watershed. This study aims to learn the prediction of sediment volume and efforts to reduce it in the Lambidaro watershed, Palembang City. This study uses two types of modeling, namely numerical models and empirical models. The numerical model uses the HEC-RAS 6.3.1 application, while the empirical model uses the USLE and SDR equations. The input parameters of the numerical model use some data derived from field measurements. The sediment concentration and observation discharge parameters were measured three times in September 2022. The grain size distribution parameters were sampled at three locations each once in August 2022, and the cohesive parameter was sampled at one location twice in August 2022. The result of the prediction of sediment volume by the numerical model is 1,421.86 m3/year. In contrast, the result of the prediction by the empirical model is 476,941.25 m3/year. Efforts to reduce the prediction of sediment volume USLE method are in the form of applying the intercropping method. The results of the conservation study show that the efforts made can reduce the volume of sediment by 17%.Keywords: sediment, flood, conservation, intercropping, Lambidaro, ABSTRAKSelama sepuluh tahun terakhir, banjir telah menjadi masalah yang paling sering terjadi di Provinsi Sumatera Selatan Indonesia. Sebagai ibu kota provinsi Sumatera Selatan, kota Palembang menghadapi masalah serupa. dimana DAS Lambidaro adalah DAS dengan potensi debit banjir kala ulang 25 tahun tertinggi di kota Palembang. Salah satu penyebab banjir adalah penurunan kapasitas alur sungai yang berkaitan dengan erosi lahan di DAS. Penelitian ini bertujuan untuk melakukan kajian prediksi volume sedimen serta upaya pengurangannya di DAS Lambidaro. Penelitian ini menggunakan dua jenis pemodelan yaitu model numerik dan model empirik. Model numerik menggunakan aplikasi HEC-RAS 6.3.1 sedangkan model empirik menggunakan persamaan USLE dan SDR. Parameter input dari model numerik menggunakan beberapa data yang berasal dari pengukuran lapangan. Parameter konsentrasi sedimen dan debit sesaat diukur sebanyak tiga kali pada bulan September tahun 2022. Parameter gradasi butiran diambil sampelnya masing – masing pada tiga lokasi sebanyak satu kali, dan parameter kohesif diambil sampelnya pada satu lokasi sebanyak dua kali pada bulan Agustus tahun 2022. Hasil prediksi sedimentasi dasar sungai model numerik adalah 1.421,86 m3/tahun sedangkan hasil prediksi volume sedimen model empirik adalah 476.941,25 m3/tahun. Upaya mengurangi prediksi volume sedimen metode USLE berupa penerapan metode tumpang-sar","PeriodicalId":409496,"journal":{"name":"JURNAL SUMBER DAYA AIR","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135929266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PEMODELAN TIME-LAPSE MICROGRAVITY UNTUK ESTIMASI PERUBAHAN MUKA AIRTANAH DI BANDUNG, JAWA BARAT","authors":"Eko Januari Wahyudi, Wawan Gunawan A. Kadir, Susanti Alawiyah, Setianingsih Setianingsih, Indra Gunawan, Dadi Abdurrahman","doi":"10.32679/jsda.v19i2.858","DOIUrl":"https://doi.org/10.32679/jsda.v19i2.858","url":null,"abstract":"ABSTRACT Studies related to groundwater monitoring using geophysical methods have been carried out since the 1990s. Surface gavity data with a scheme of relative gravimeter measurements is chosen for monitoring in urban areas because it is quite fast, easy, affordable, and relatively low-impact on the environment. The significance of the time-lapse microgravity method for the target of this study depends on changes in the mass of water in the aquifer layer below the surface. The research area in this study covers the city of Bandung and several surrounding areas with an interpolated grid coverage of (18 x 17) km2. Gravity changes were determined by six repeated surveys at the same observation points from 2010 to 2021. The aim of this research is to develop a method for estimating groundwater table changes based on time-lapse microgravity data modeling. The complexity of subsurface density changes is simplified for two parts related to near surface density changes and density changes in the intermediate aquifer layer. The trend of groundwater table data in 2010 is used as a reference to determine estimates for 2015, 2016 (February and August), 2019, and 2021. Modeling results for intermediate aquifers (confined groundwater system) provide changes in groundwater levels from 2010 with estimates reached ±23 meters, while the results of modeling at near surface (shallow groundwater level) indicate a groundwater level change of approximately ±8 meters from the year 2010.Keywords: microgravity, groundwater, modeling, hydrology, aquifer. ABSTRAKStudi terkait pemantauan airtanah dengan metode geofisika telah dilakukan sejak tahun 1990-an. Data gravity di permukaan dengan skema pengukuran gravimeter relatif dipilih pada pemantauan di area perkotaan karena cukup cepat, mudah, murah, dan relatif tidak merusak lingkungan. Signifikansi metode time-lapse microgravity pada target studi ini bergantung pada perubahan massa air pada lapisan akuifer di bawah permukaan. Area penelitian pada studi ini mencakup Kota Bandung dan beberapa area di sekitarnya dengan cakupan luasan interpolasi grid (18 x 17) km2. Perubahan gravitasi ditentukan oleh enam kali survei berulang pada beberapa titik pengamatan yang sama sejak 2010 sampai 2021. Tujuan dari penelitian ini adalah mengembangkan metode untuk mengestimasi perubahan muka airtanah berdasarkan pemodelan data time-lapse microgravity. Kompleksitas perubahan densitas di bawah permukaan disederhanakan untuk dua bagian terkait perubahan densitas dekat permukaan dan perubahan densitas pada lapisan akuifer menengah. Kecenderungan dari data muka airtanah pada tahun 2010 digunakan sebagai acuan untuk menentukan estimasi pada tahun 2015, 2016 (Februari dan Agustus), 2019, dan 2021. Hasil pemodelan pada akuifer menengah (sistem airtanah tertekan) memberikan perubahan muka airtanah dari tahun 2010 dengan estimasi mencapai ±23 meter, sedangkan hasil pemodelan pada kedalaman yang lebih dangkal (muka airtanah dangkal) menunjukkan peruba","PeriodicalId":409496,"journal":{"name":"JURNAL SUMBER DAYA AIR","volume":"42 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135929106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RESPON MODEL HBV DAN MODEL TANGKI TERHADAP ESTIMASI DEBIT ALIRAN DI DAS BOGOWONTO, JAWA TENGAH","authors":"Fitri Yusti Andini, Bambang Dwi Dasanto, I Putu Santikayasa","doi":"10.32679/jsda.v19i2.830","DOIUrl":"https://doi.org/10.32679/jsda.v19i2.830","url":null,"abstract":"ABSTRACT The scarcity of discharge data compared to rainfall data have driven the development of the rainfall-runoff model, such as the HBV and Tank models. This research aims to apply the rainfall-runoff model in the Bogowonto watershed and to assess the model outputs. The research consisted of two main stages: 1) model calibration and validation; 2) model evaluation which assesses the model performance based on the Nash-Sutcliffe Efficiency (NSE) index and the coefficient of determination (R2). The results showed that the pattern of the simulation discharge was in accordance with the observed discharge pattern; indicating performance of both models was good (NSE > 0.7 and R2 > 0.65). However, the performance of both models in the daily simulation, particularly at the beginning of the simulation period, is still not satisfactory as the simulated discharge does not match the observed discharge. In the next simulation period, the discharge of the model results were in accordance with the observed discharge; this means the performance of the model was better. In the monthly simulation, the performance of both models is not yet satisfactory during the wet season, but it is good during the dry season. Based on the results of the daily and monthly simulations, both models demonstrate good performance under low precipitation conditions, but their performance declines under high precipitation conditionsKeywords: Bogowonto watershed; HBV; rainfall-runoff model; simulation; tank ABSTRAKKelangkaan data debit dibandingkan data curah hujan memacu perkembangan model hujan-limpasan, seperti model HBV dan model Tangki. Tujuan penelitian ini adalah menerapkan model hujan-limpasan pada DAS Bogowonto dan menilai luaran hasil model tersebut. Penelitian ini terdiri dari dua tahap. Tahap pertama adalah kalibrasi dan validasi model. Tahap kedua mengevaluasi model, yaitu menilai kinerja model berdasarkan status indeks NSE dan nilai koefisien determinasi. Hasil penelitian menunjukkan bahwa secara umum pola debit simulasi telah sesuai dengan pola debit observasi, ini berarti kinerja kedua model adalah baik (NSE > 0,7 dan R2 > 0,65). Namun, kinerja kedua model dalam simulasi harian, khususnya pada waktu awal simulasi, masih belum baik karena debit simulasi tidak sesuai dengan debit observasi. Pada periode simulasi selanjutnya, debit hasil model telah sesuai dengan debit observasi; artinya, kinerja model telah semakin baik. Dalam simulasi bulanan, saat musim basah kinerja kedua model masih belum baik tetapi saat musim kering kinerja kedua model menunjukkan hasil yang baik. Berdasarkan hasil simulasi harian dan bulanan, kedua model menunjukkan kinerja yang baik saat hujan rendah tetapi saat hujan tinggi kinerja model mengalami penurunan.Kata Kunci: DAS Bogowonto; HBV; model hujan-limpasan; simulasi; tangki","PeriodicalId":409496,"journal":{"name":"JURNAL SUMBER DAYA AIR","volume":"101 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135927861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PENGARUH KEBERADAAN BENDUNGAN LEUWIKERIS DAN BENDUNGAN MATENGGENG TERHADAP ALOKASI AIR DAERAH ALIRAN SUNGAI (DAS) CITANDUY","authors":"Yusanuari Alaniri, Yadi Suryadi","doi":"10.32679/jsda.v19i2.857","DOIUrl":"https://doi.org/10.32679/jsda.v19i2.857","url":null,"abstract":"ABSTRACT The Citanduy watershed service area, which is located in Cilacap Regency, Ciamis Regency, Pangandaran Regency and Banjar City, is currently experiencing an increase in population growth, residential facilities, and the number of immigrants, so that the demand for raw water in these areas is increasing. On the other hand, the availability of water in the area is decreasing, so it is necessary to study potential sources of raw water to determine the solutions to be taken in order to meet the demand for raw water supply and develop potential water resources in the study area. The purpose of this study is to simulate water allocation using the WEAP (Water Evaluation And Planning) software in the Citanduy watershed area. In the data analysis section, two water balance simulation scenarios were created based on the various suggestions to be recommended for developing the potential of water resources in the study area. From the two scenarios that were implemented, a recommendation emerged to build a new irrigation area of 18.800 ha, the Leuwikeris Reservoir with a volume of 69,56 million m3 and the Matenggeng Reservoir with a volume of 500 million m3. With the plan to meet these water needs, it is necessary to conduct a feasibility study of water allocation in order to find out how technically feasible both the Citanduy River and the Leuwikeris Dam are in meeting the water needs as previously planned. Given the strategic location of West Java and Central Java Provinces and the many irrigation areas located within them, the need for and demand for water services will continue to increase over time.Keywords : simulation of water allocation, Citanduy watershed, Leuwikeris reservoir, Matenggeng reservoir. ABSTRAKDaerah layanan DAS Citanduy, yang terdapat di Kabupaten Cilacap, Kabupaten Ciamis, Kabupaten Pangandaran dan Kota Banjar saat ini terus mengalami peningkatan pertumbuhan jumlah penduduk, fasilitas pemukiman, dan jumlah pendatang, sehingga kebutuhan air baku di wilayah tersebut semakin meningkat. Di sisi lain ketersediaan air di wilayah tersebut semakin berkurang, sehingga diperlukan adanya suatu studi potensi sumber air baku untuk menentukan solusi yang akan diambil dalam rangka memenuhi kebutuhan penyediaan air baku dan pengembangan potensi sumber daya air di wilayah studi. Tujuan dari studi ini adalah melakukan simulasi alokasi air dengan menggunakan perangkat lunak WEAP (Water Evaluation And Planning) di wilayah DAS Citanduy. Pada bagian analisis data, dibuat dua skenario simulasi neraca air berdasarkan berbagai usulan yang ingin direkomendasikan untuk mengembangkan potensi sumber daya air di wilayah studi. Dari kedua skenario yang dijalankan, muncul sebuah rekomendasi untuk membangun daerah irigasi baru seluas 18.800 Ha, Waduk Leuwikeris dengan volume 69,56 juta m3 dan Waduk Matenggeng dengan volume 500 juta m3. Dengan rencana pemenuhan kebutuhan air tersebut, maka diperlukan adanya suatu kajian kelayakan alokasi air guna mengetahui seb","PeriodicalId":409496,"journal":{"name":"JURNAL SUMBER DAYA AIR","volume":"126 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135929421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OPTIMASI PEMBERIAN AIR IRIGASI TANAMAN MELON (Cucumis Melo L.) PADA SISTEM POCKET FERTIGATION DENGAN ALGORITMA GENETIKA","authors":"Abdul Malik, Chusnul Arif","doi":"10.32679/jsda.v19i1.825","DOIUrl":"https://doi.org/10.32679/jsda.v19i1.825","url":null,"abstract":"ABSTRACT Irrigating and fertilizing (known as fertigating) should be applied more effectively and efficiently. Pocket fertigation technology as an alternative fertigation was developed to achieve those purposes. The main challenge applied to the technology is to determine the optimum irrigation water. The objective of the study is to optimize irrigation water of the pocket fertigation, particularly in determining the optimal soil moisture during the growth stage by genetic algorithms. The method was developed based on one planting season of melon (Cucumis Melo L) cultivation under two different emitter of pocket fertigation with two different water irrigation regimes as well as the control. The treatments were pocket fertigation with textile layer emitter and wet irrigation (PK-H), textile layer emitter and dry irrigation (PK-L), emitter without layer and wet irrigation (PT-H), emitter without layer and wet irrigation (PT-L), and control with wet irrigation (PC-H) and dry irrigation (PC-L), respectively. The genetic algorithms model was developed with the objective function to achieve optimum fruit fresh weight and sweetness level. As the results, the optimum soil moisture is 0.34; 0.32; 0.31; 0.30; 0.26; 0.30; and 0.29 m3/m3 for every 9 days during the planting period. This value is thought to produce optimum fruit with a weight of 1115 g, a sweetness value of 8.6 brix, and increased water productivity of 27-46%. In addition, the pocket fertigation increased water productivity by 14,17% compared to without the pocket fertigation. Keywords: irrigation water,  genetic algorithm, pocket fertigation, water productivity. abstrakIrigasi dan pemupukan (atau dikenal dengan fertigasi) perlu dilakukan lebih efektif dan efisien. Pocket fertigation merupakan teknologi alternatif yang dikembangkan dalam upaya mencapai hal tersebut. Tantangan utama dalam penerapan teknologi tersebut adalah penentuan pemberian air irigasi yang optimal. Penelitian ini bertujuan untuk menentukan pemberian air irigasi yang optimal pada pocket fertigation yang direpresentasikan dengan nilai kelembapan tanah optimal selama periode tanam dengan menggunakan Algoritma Genetika. Untuk mencapai tujuan tersebut, uji coba satu musim tanam dilakukan pada budidaya melon (Cucumis melo L) dengan dua desain emiter pocket fertigation, dua sistem irigasi dengan perlakuan kontrol. Secara detail perlakuan tersebut adalah pocket fertigation dengan penggunaan kain tekstil pelapis emiter dan irigasi basah (PK-H), dengan irigasi kering (PK-L), emiter tanpa kain dengan irigasi basah (PT-H), dan irigasi kering (PT-L) dan dua perlakuan kontrol tanpa emiter dengan irigasi basah (PC-H), dan irigasi kering (PC-L). Model optimasi algoritma genetika memiliki fungsi tujuan untuk mencapai bobot buah dan kemanisan optimum. Hasil optimasi menunjukkan nilai kelembapan tanah optimal sebesar 0,34; 0,32; 0,31; 0,30; 0,26; 0,30; dan 0,29 m3/ m3 pada setiap 9 harian selama periode musim tanam. Dengan kondisi Kelembapan","PeriodicalId":409496,"journal":{"name":"JURNAL SUMBER DAYA AIR","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124238253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANALISIS KARAKTERISTIK CURAH HUJAN PENYEBAB BANJIR BERDURASI PANJANG (STUDI KASUS: BANJIR TAHUN 2019 DI BALEENDAH, JAWA BARAT)","authors":"Yogi Sahat Maruli Simanjuntak, Rusmawan Suwarman, Riawan Edi","doi":"10.32679/jsda.v19i1.821","DOIUrl":"https://doi.org/10.32679/jsda.v19i1.821","url":null,"abstract":"ABSTRACT In 2019, Baleendah experienced flooding with a duration of ± 30 days, this can be seen from the water level which is above the critical point from February 9th – March 12th, 2019, which identified the occurrence of flooding. Based on the spatio-temporal analysis of rainfall in the upstream Citarum watershed that drains to Baleendah, there were differences in the timing of rainfall between northern, southern, and eastern regions, and a semi-diurnal pattern. This study aims to look at the rainfall pattern that causes long-duration flooding in Baleendah. Based on that point, we conducted hydrological simulations using the Hydrologic Engineering Center’s Hydrologic Model System (HEC-HMS) with the assumption that the volume of rainfall is constant.  The rainfall scenarios used were 1) a diurnal scenario where there is a difference in the timing of rainfall between the north, south, and east regions, 2) rainfall scenarios with diurnal and semidiurnal variations, and 3) the semidiurnal scenario is getting closer (the timing between rainfall in the morning and in the night is getting closer) in the north, south, and east regions. The results of this study show that floods are longer in duration and peak discharge is higher when a diurnal pattern occurs. Rainfall is initiated in the eastern and southern regions and a lag in timing rainfall occurred in the northern region.Keywords:      Baleendah, Long duration flood, rainfall time difference, variation of diurnal and semidiurnal, and short semidiurnal ABSTRAK Baleendah pada tahun 2019 mengalami banjir dengan durasi ± 30 hari, terlihat bahwa tinggi muka air berada di atas titik kritis mulai tanggal 9 Februari – 12 Maret 2019 yang mengidentifikasikan kejadian banjir. Berdasarkan analisis pola spasio-temporal curah hujan di seluruh DAS Citarum Hulu yang bermuara ke Baleendah, terdapat hujan yang terjadi secara bersamaan, hujan beda waktu antara wilayah utara, selatan, dan timur, serta terdapat hujan dengan 2 puncak dalam satu hari. Penelitian ini bertujuan untuk menentukan pola curah hujan yang menyebabkan banjir berdurasi panjang di Baleendah. Berdasarkan hal tersebut dilakukan simulasi hidrologi dengan menggunakan Hidrologic Engineering Center’s Hidrologic Model System (HEC-HMS) dengan asumsi volume hujan adalah sama. Adapun skenario yang digunakan adalah 1) skenario diurnal dimana terdapat beda waktu hujan antara wilayah Utara, Selatan dan Timur, 2) skenario hujan dengan variasi semidiurnal dan diurnal, serta 3) skenario semidiurnal mendekat (jarak waktu hujan sore dan pagi semakin dekat) di wilayah utara, selatan dan wilayah timur. Hasil dari penelitian ini menunjukkan bahwa banjir akan berdurasi lebih lama serta debit puncak akan semakin besar apabila terjadi dengan pola diurnal dimana hujan diinisiasi di wilayah timur dan selatan serta wilayah utara mengalami jeda waktu hujan.Kata kunci: Baleendah, Banjir berdurasi lama, beda waktu hujan, variasi diurnal dan semidiurnal, semidiurnal mendekat","PeriodicalId":409496,"journal":{"name":"JURNAL SUMBER DAYA AIR","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130109824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MONITORING DAN EVALUASI PENERAPAN TEKNOLOGI MODIFIKASI CUACA DI DAS WADUK KASKADE - CITARUM, JAWA BARAT","authors":"Isnan Fauzan Akrom, Muhammad Fauzi","doi":"10.32679/jsda.v19i1.811","DOIUrl":"https://doi.org/10.32679/jsda.v19i1.811","url":null,"abstract":"ABSTRACT The 2020 drought led to a reduction in the water supply of the Citarum cascade reservoirs (Saguling, Cirata, and Juanda) due the lowering intensity of rainfall in the catchments of the three reservoirs. Rainfall in late 2020 through February 2021 was much lower than the predicted and historical averages. This caused the water level of the Citarum cascade reservoirs fell to be below normal at the end of December 2020. To meet the water demand, an increase in inflow enhancement is needed, hence the implementation of Weather Modification Technology (WMT) which was carried out on March 12th - April 21st, 2021 in the Citarum watershed, West Java Province. WMT is applied for increasing or decreasing the amount of rainfall by intervening in the cloud growth process, which is carried out by seeding NaCl powder on clouds using an airplane. The purpose of monitoring and evaluation (M&E) of WMT implementation is to collect data, analyze, and evaluate the hydrological conditions of the Citarum cascade reservoirs during WMT implementation. The purpose of M&E is to assess the success of additional reservoir volume due to rainfall during WMT implementation. The M&E is conducted by collecting daily data of the rainfall, water level, and hydrological data of the reservoirs. The data collected each day is used as the basis for the seeding strategy on that day. After the WMT implementation activities are completed, an evaluation of the overall WMT implementation results is continued, which includes analyzing rainfall data, river water level, as well as the inflow, volume, and water level of the reservoir. The results of this study show that WMT implementation could not raise the water level of the three reservoirs to the Normal Operating Limit, but it has succeeded in increasing the reservoir volume by approximately 270 million m3 for Saguling, 201 million m3 for Cirata, and 59 million m3 for Juanda.Keywords:   Reservoir, Citarum, Weather, Modification, Technology ABSTRAKKemarau tahun 2020 mengakibatkan berkurangnya pasokan air waduk kaskade Citarum (Saguling, Cirata, dan Juanda) akibat berkurangnya intensitas air hujan yang jatuh pada daerah aliran sungai ketiga waduk. Curah hujan pada akhir 2020 hingga Februari 2021 jauh lebih rendah dari rata-rata historis dan prediksinya. Hal tersebut mengakibatkan kondisi muka air waduk kaskade Citarum turun hingga dibawah Normal pada akhir Desember 2020. Untuk memenuhi kebutuhan air dibutuhkan peningkatan inflow, melalui penerapan Teknologi Modifikasi Cuaca (TMC) yang telah dilaksanakan pada 12 Maret – 21 April 2021 di DAS Citarum, Provinsi Jawa Barat. TMC diterapkan untuk menambah atau mengurangi curah hujan dengan melakukan intervensi pada proses pertumbuhan awan, yang dilakukan dengan penyemaian serbuk NaCl pada awan menggunakan pesawat. Maksud dilakukannya monitoring dan evaluasi (Monev) terhadap penerapan TMC adalah untuk pengumpulan data, analisis, dan evaluasi kondisi hidrologi waduk kaskade Citarum selama pel","PeriodicalId":409496,"journal":{"name":"JURNAL SUMBER DAYA AIR","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130337534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANALISIS KEKERINGAN METEOROLOGI DENGAN MENGGUNAKAN METODE STANDARDIZED PRECIPITATION INDEX DI KUPANG – NUSA TENGGARA TIMUR","authors":"D. Krisnayanti, Mirnawati S Pasoa, Remigildus Cornelis","doi":"10.32679/jsda.v19i1.793","DOIUrl":"https://doi.org/10.32679/jsda.v19i1.793","url":null,"abstract":"ABSTRACT Kupang City and Kupang Regency have semiarid climatological conditions where annual rainfall ranges from an average of 1,250 mm/year. Kupang City and Kupang Regency experience long days without rain, which potentially causes meteorological drought. The study aims to determine the value and distribution of the drought index in Kupang City and Kupang Regency. This study uses the Standardized Precipitation Index (SPI) method using rainfall data for 21 years (1998-2018) from 12 rainfall stations, while the mapping uses ArcGIS Software. The results obtained from this study are the extreme level of drought in Kupang Regency and Kupang City occurred in 2015-2016. A 1-month SPI Kupang City experienced the highest drought in January 2004 at -3.48, while Kupang Regency occurred in November 2015 at -3.06.  The 3-month SPI Kupang City experienced the highest drought in January 2016 at -3.85, while Kupang Regency occurred in December 2012 at -4.13. The 6-month SPI of  Kupang City experienced the highest drought in January 2016 at -4.04, while Kupang Regency occurred in November 2015 at -4.82.  The 12-month SPI Kupang City experienced the highest drought in March 2016 at -3.76, while Kupang Regency occurred in April 2016 at -3.36. The 6-month SPI tends to fluctuate more in value than the 1-month SPI, 3-month SPI, and 12-month SPI. The drought years that occurred in 2015 – 2016 triggered forest and land fires in Kupang City. Besides that,  the Meteorological drought must be anticipated by setting appropriate cropping patterns to avoid food insecurity. Keywords: Drought, semiarid, land fires, mapping ABSTRAKKota Kupang dan Kabupaten Kupang merupakan daerah yang memiliki kondisi klimatologi semi-ringkai dimana curah hujan tahunan berkisar rata-rata 1.250 mm/Tahun. Kota Kupang dan Kabupaten Kupang mengalami hari tanpa hujan yang panjang sehingga berpotensi menyebabkan kekeringan meteorologis. Studi ini bertujuan untuk mengetahui nilai dan hasil sebaran indeks kekeringan di Kota Kupang dan Kabupaten Kupang. Analisis ini menggunakan Metode Standardized Precipitation Index (SPI) dengan menggunakan data curah hujan selama 21 tahun (1998-2018) dari 12 pos hujan, sedangkan pemetaan menggunakan Software ArcGIS. Hasil yang didapatkan adalah tingkat kekeringan terparah terjadi di Kabupaten Kupang dan Kota Kupang terjadi tahun 2015-2016. Untuk perhitungan SPI-1, Kota Kupang mengalami kekeringan tertinggi pada bulan Januari tahun 2004 sebesar -3,48, sedangkan Kabupaten Kupang terjadi pada bulan November tahun 2015 sebesar -3,06. Pada perhitungan SPI 3, Kota Kupang mengalami indeks kekeringan tertinggi pada bulan Januari tahun 2016 sebesar -3,85, sedangkan Kabupaten Kupang terjadi pada bulan Desember tahun 2012 sebesar -4,13. Pada perhitungan SPI-6, Kota Kupang mengalami indeks kekeringan tertinggi pada bulan Januari tahun 2016 sebesar -4,04, sedangkan Kabupaten Kupang terjadi pada bulan November tahun 2015 sebesar -4,82. Pada perhitungan SPI-12, Kota Kupang mengalam","PeriodicalId":409496,"journal":{"name":"JURNAL SUMBER DAYA AIR","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125601842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PENGARUH DINAMIKA PASANG SURUT TERHADAP DAERAH IRIGASI RAWA PANTAI KABUPATEN KAPUAS PROVINSI KALIMANTAN TENGAH","authors":"Asril Zevri","doi":"10.32679/jsda.v19i1.803","DOIUrl":"https://doi.org/10.32679/jsda.v19i1.803","url":null,"abstract":"ABSTRACTThe food crisis caused by the Covid-19 pandemic has caused the level of hunger to increase to a chronic level that is almost experienced by the whole world, including Indonesia. The increase in population with extreme climate change is a serious problem to overcome the food crisis in the next few years. The impact of climate change with changes in land use results in limited water availability in the development of irrigated land. One solution to overcome the availability of water for the development of irrigated land is to rehabilitate and improve the network of swamp irrigation areas that utilize the dynamics of tidal water levels. Pantai Swamp Irrigation Area is one of the potential lands to be developed into agricultural cultivation land. The study aims to determine the effect of tidal water level elevation on irrigated land based on hydro-topography. The study was conducted in the Pantai Swamp Irrigation Area with the water source coming from the tidal Kapuas Murung River. The method was conducted quantitatively using HEC-RAS software based on tidal data, cross-section and length of the channel, and surface elevation of irrigated land. The results showed that the influence of the tidal dynamics of the Kapuas Murung River is very dominant in irrigating the land with an average tidal water level elevation of + 1.57 m with hydro-topographic dominance included in categories B and C with an area of B 604.5 Ha and C 1201. 5 Ha.Keywords: Tides, Swamps, Hydro-topography, Sungai, Kapuas ABSTRAKKrisis pangan yang diakibatkan oleh pandemic Covid-19 mengakibatkan tingkat angka kelaparan meningkat hingga mencapai angka kronis yang hampir dialami oleh seluruh dunia termasuk Indonesia. Pertambahan jumlah penduduk dengan perubahan iklim yang sangat ekstrem menjadi permasalahan yang cukup serius untuk mengatasi krisis pangan dalam beberapa tahun kedepan. Dampak perubahan iklim dengan perubahan tata guna lahan mengakibatkan jumlah ketersediaan air terbatas dalam pengembangan lahan irigasi. Salah satu solusi untuk mengatasi ketersediaan air untuk pengembangan lahan irigasi yaitu dengan rehabilitasi dan peningkatan jaringan daerah irigasi rawa yang memanfaatkan dinamika muka air pasang surut. Daerah Irigasi Rawa Pantai menjadi salah satu lahan yang berpotensi untuk dikembangkan menjadi lahan budidaya pertanian. Penelitian bertujuan untuk mengetahui pengaruh elevasi muka air pasang surut terhadap lahan irigasi yang ditinjau berdasarkan hidro-topografi. Kajian dilakukan di Daerah Irigasi Rawa Pantai dengan sumber air berasal dari pasang surut Sungai Kapuas Murung. Metode dilakukan secara kuantitatif menggunakan Software HEC-RAS berdasarkan data pasang surut, tampang melintang dan memanjang saluran, dan elevasi permukaan lahan irigasi. Hasil penelitian menunjukan pengaruh dinamika pasang surut Sungai Kapuas Murung sangat dominan dalam mengairi lahan dengan elevasi muka air rata-rata pasang berada di ketinggian + 1.57 m dengan dominasi hidro-topografi terma","PeriodicalId":409496,"journal":{"name":"JURNAL SUMBER DAYA AIR","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127272441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}