Jurnal Meteorologi dan Geofisika最新文献

{"title":"COMPARING BIAS CORRECTION METHODS TO IMPROVE MODELLED PRECIPITATION EXTREMES","authors":"Y. Sarvina, T. Pluntke, C. Bernhofer","doi":"10.31172/JMG.V19I2.449","DOIUrl":"https://doi.org/10.31172/JMG.V19I2.449","url":null,"abstract":"This study aims to analyze and improve modelled extreme precipitation. It was conducted in the German Federal State of Saxony using the WEREX V data set. WEREX V is a model that statistically downscales Global Circulation Model (GCM) data. Inputs for the WEREX V model included GCMs ECHAM 5, HadCM3C and HadGEM2 (sometimes downscaled with Regional Climate Models RCMs REMO, RACMO and CCLM), SRES scenarios A1B and E1, and different model runs. The output of analysis was shown by a boxplot since the WEREX V data set has 120 future projections of precipitation. The model results were verified against observed data obtained from representative meteorological stations, and systematical deviations or biases were identified. To improve the model results, two bias correction methods were applied with special emphasis given to the reproduction of precipitation extremes. Empirical quantile mapping and gamma quantile mapping methods were applied. The ability of the WEREX V ensemble to capture extreme precipitation values varied; this was described in terms of biases. All of the identified correction methods were capable of reducing the bias related to the intensity of extreme precipitation occurrence during the calibration period. The performance of empirical quantile mapping is better than gamma quantile mapping to reduce biases (median value) and uncertainty (inter quartile range value). Penelitian ini bertujuan untuk mengoreksi bias curah hujan ekstrim keluaran model. Wilayah kajian dalam penelitian ini adalah negara bagian Saxony, German sedangkan data model yang digunakan adalah data WEREX V. Dataset WEREX V adalah data GCM yang yang didownscale secara statistic. Adapun GMC yang digunakan adalah ECHAM 5, HadCM3, HadGem2 dan beberapa RCM (REMO, RAMCO, dan CCLM) dengan menggunakan skenarios SRES A1B and E1. Karena dataset WEREX V terdiri dari 120 data model, maka boxplot digunakan untuk menggambarkan hasil analisis baik untuk identifikasi maupun koreksi bias. Hasil keluaran model dibandingkan dengan data pengamatan (observasi) dari stasiun meteorologi. Dari hasil perbandingan ini, bias akan dideteksi. Untuk meningkatkan akurasi model, bias dikoreksi menggunakan dua metode yaitu Emperical quantile mappinh (EQM) dan Gamma quatile mapping (gamma). Kemampuan model (data WEREX V) untuk menggambarkan curah hujan ekstrim berbeda antar stasiun hal ini digambarkan dengan nilai bias yang berbeda. Metode EQM dan Gamma mampu mengurangi bias maupun ketidakpastian model (uncertainty). Performa EQM lebih baik dibandingkan Gamma. Secara umum EQM mampu mengurangi bias maupun ketidakpastian model.","PeriodicalId":32347,"journal":{"name":"Jurnal Meteorologi dan Geofisika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77925784","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":"PEMANFAATAN SATELIT ALTIMETRI UNTUK VERIFIKASI TINGGI GELOMBANG SIGNIFIKAN OCEAN FORECAST SYSTEM (OFS) – MODEL BMKG","authors":"Eko Supriyadi","doi":"10.31172/JMG.V19I2.586","DOIUrl":"https://doi.org/10.31172/JMG.V19I2.586","url":null,"abstract":"Model OFS-BMKG yang sudah beroperasi sejak akhir tahun 2016 belum banyak dilakukan verifikasi secara menyeluruh di perairan Indonesia.  Penelitian kali ini melakukan kajian verifikasi tinggi gelombang laut signifikan (SWH) hasil pemodelan OFS menggunakan pengamatan satelit altimetri untuk periode Januari 2017. Verifikasi dilakukan dengan menyesuaikan posisi SWH yang diperoleh dari lintasan satelit terhadap kontur model menggunakan grid yang sama.  Hasil analisis statistika menunjukkan nilai koefisien korelasi SWH antara hasil model dengan pengamatan satelit  tergolong baik, yaitu sebesar 0.64.  Sedangkan untuk uji bias, RMSE, dan SI masing-masing bernilai 0.41, 0.89, dan 0.52.  Secara umum bila dilihat dari plot time series dan sebaran data setiap waktu pengamatan umumnya hasil model lebih tinggi dibandingkan pengamatan satelit. Sehingga dibutuhkan penyesuaian untuk hasil model agar sesuai dengan pengamatan sebenarnya. The OFS-BMKG system has been operating since the end of 2016 but has not been verified in Indonesian waters. This system was developed from the WaveWatch III (WW3) model. This study was conducted to verify OFS Significant Wave Height (SWH) against satellite altimetry measurements for the period of January 2017. The verification was performed by adjusting the position of SWH obtained from the altimetry satellite path to the contour of the WW3 model for the same grids. The results showed that the OFS SWH had good accordance with the satellite measurement. The correlation coefficient was 0,64 while bias, RMSE, and SI values were 0,41; 0,89; and 0,52, respectively. The time series and data distribution showed that OFS SWH, in general, had higher values than that measured by altimetry satellite. Adjustments or fine-tuning therefore are required for the WW3 model results to match actual observations.","PeriodicalId":32347,"journal":{"name":"Jurnal Meteorologi dan Geofisika","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86955021","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 PROFIL VERTIKAL PADA SIKLON TROPIS CEMPAKA DAN DAHLIA","authors":"Eka Fibriantika","doi":"10.31172/JMG.V19I2.589","DOIUrl":"https://doi.org/10.31172/JMG.V19I2.589","url":null,"abstract":"Siklon Tropis Cempaka dan Dahlia yang terbentuk di wilayah Tropical Cyclone Warning Center (TCWC) Jakarta pada akhir bulan November 2017 telah mengakibatkan banjir dan tanah longsor di sebagian besar Pulau Jawa. Posisi kedua siklon tersebut yang sangat dekat dengan Pulau Jawa mempengaruhi kondisi tropospher atas dan stratosphere bawah di Pulau Jawa. Pada penelitian ini dilakukan  analisis profil vertikal atmosphere di Pulau Jawa dengan menggunakan data Radiosonde pada tiga stasiun pengamatan radiosonde, yaitu Stasiun Meteorologi Cengkareng, Stasiun Meteorologi Cilacap, dan Stasiun Meteorologi Juanda. Penelitian  ini bertujuan mengetahui kondisi profil vertikal pada saat terjadi Siklon Tropis Cempaka dan Siklon Tropis Dahlia. Data yang digunakan adalah data radiosonde pada Desember-Februari (DJF) tahun 2013-2017 di Stasiun Meteorologi Cengkareng dan Juanda, DJF tahun 2017 di Stasiun Meteorologi Cilacap, serta data pada ketiga stasiun saat terjadi siklon tropis. Nilai rerata parameter cuaca dan indeks stabilitas a tmosphere yang diperoleh melalui software RAOB versi 6.5 menunjukan Siklon Tropis Cempaka memiliki pengaruh yang lebih signifikan terhadap kondisi profil vertikal atmosfer di Pulau Jawa dibandingkan dengan Siklon Tropis Dahlia. Equatorial Undercurrent (EUC) plays an important role in the dynamic of the eastern Indian Ocean. EUC supplies water masses with high salinity into Indonesian waters. This article examines the EUC and its water mass characteristics at 90°E across 2°S - 2°N on 1st - 3rd March 2017 which is part of the Initiative on Maritime Observation and Analysis Expedition (Indonesian Prima 2017). The analysis of temperature, salinity, and sigma-t data obtained from conductivity, temperature and depth (CTD) instruments at five stations (CTD11-CTD14) and current profiles of Shipboard Acoustic Doppler Current Profiles (SADCP) indicate the presence of high-speed water column flowing the Arabian Sea High Salinity Water (ASHSW) as characterized by maximum salinity (35.15 - 35.2 PSU) in the temperature range of 18 ° C - 23 ° C and density of 23 - 25 kg / m3. ASHSW is carried by EUC from the western Indian Ocean at the upper thermocline layer. It was found that EUC during this study tended to be asymmetrically stronger to the north of the equator. The analysis shows a maximum speed of 94 cm/sec and a transport estimated of EUC water masses based on salinity contour 35.15 and 35.2 PSU respectively of 3.4 Sv and 1.4 Sv, while at salinity 35.00 - 35.10 PSU of 8.7 Sv. The total estimated EUC mass transport calculated in this study is 13.5 Sv.","PeriodicalId":32347,"journal":{"name":"Jurnal Meteorologi dan Geofisika","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77131878","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":"EVALUASI DATA GRAVITASI TERESTRIAL DAN PERBANDINGANNYA DENGAN DATA GRAVITASI SKALA REGIONAL DAN MODEL GEOPOTENSIAL GLOBAL: STUDI KASUS ZONA SESAR CIMANDIRI DI SEKITAR PELABUHANRATU","authors":"Ilham Arisbaya, Lina Handayani, Yayat Sudrajat","doi":"10.31172/JMG.V19I1.399","DOIUrl":"https://doi.org/10.31172/JMG.V19I1.399","url":null,"abstract":"Dalam rangka mempelajari karakteristik Zona Sesar Cimandiri (ZSC), telah dilakukan pengukuran metode gravitasi di sekitar Pelabuhanratu. Kegiatan ini menghasilkan 53 data pengukuran baru dengan interval jarak 750-1500 meter (selanjutnya disebut GCG16). Untuk menggambarkan tingkat kualitas data yang dihasilkan, GCG16 dievaluasi dengan cara dibandingkan dengan dataset gravitasi skala regional dan global terpublikasi. Secara visual peta GCG16 memperlihatkan pola anomali gravitasi yang sama dengan data gravitasi regional (GRAV-P3G), model geopotensial global data satelit (EIGEN-6S2 dan GO_CONS_GCF_2_DIR_R5), serta model geopotensial global kombinasi (EGM2008 dan EIGEN-6C4). Dataset GRAV-P3G yang juga merupakan hasil pengukuran terestrial menunjukkan tingkat kesesuaian paling tinggi dengan GCG16. Sementara model potensial global kombinasi menunjukkan tingkat kesesuaian yang lebih baik jika dibandingkan dengan model geopotensial data satelit. Keenam dataset memperlihatkan pola Anomali Bouguer tinggi di bagian selatan area penelitian, mengindikasikan kontribusi dari frekuensi rendah. Variasi anomali tinggi di sekitar Sungai Cimandiri tidak teramati pada data gravitasi satelit, diinterpretasikan sebagai kontribusi dari frekuensi tinggi (berkorelasi dengan kondisi bawah permukaan lebih dangkal). Oleh karena itu untuk mempelajari struktur dangkal CFZ perlu dilakukan pemisahan anomali residual dari anomali regionalnya. Analisis First Horizontal Derivative (FHD) dan First Vertical Derivative (FVD)  tidak menunjukkan kehadiran ZSC pada segmen timur GCG16, dan mengindikasikan ZSC sebagai sistem sesar yang tersegmentasi. To study the characteristics of the Cimandiri Fault Zone (CFZ), gravity method measurement has been done around Pelabuhanratu. This activity resulted in 53 new measurement data with intervals of 750-1500 meters (hereafter referred to as GCG16). To illustrate the quality level of resulted data, GCG16 was evaluated by comparing with published regional and global scale gravity datasets. Visually, GCG16 maps show the same gravity anomalies pattern with regional gravity data (GRAV-P3G), global geopotential model of satellite data (EIGEN-6S2 and GO_CONS_GCF_2_DIR_R5), as well as combined global geopotential model (EGM2008 and EIGEN-6C4). GRAV-P3G dataset, which is also a result of terrestrial measurement, shows the highest agreement level to GCG16. The six datasets show a high Bouguer Anomaly pattern in the southern part of the research area, indicating the contribution of low frequencies. High anomaly variations around the Cimandiri River were not observed in satellite gravity data and interpreted as high frequencies contribution (correlated with more superficial subsurface conditions). Therefore, to study the shallow structure of the CFZ, it is necessary to separate the residual anomaly from the regional anomaly. First Horizontal Derivative (FHD) and First Vertical Derivative (FVD) analysis do not show the presence of CFZ in the eastern segment of ","PeriodicalId":32347,"journal":{"name":"Jurnal Meteorologi dan Geofisika","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84638204","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":"AIR-SEA INTERACTION MECHANISMS IN THE GENERATION OF PERSISTENCE LOW PRESSURE AREA OVER THE EASTERN INDIAN OCEAN SOUTHWEST SUMATERA OBSERVED DURING THE INDONESIA PRIMA 2017 FIELD CAMPAIGN","authors":"S. Siswanto, E. Kusmanto, Sri Puji Rahayu","doi":"10.31172/JMG.V19I1.523","DOIUrl":"https://doi.org/10.31172/JMG.V19I1.523","url":null,"abstract":"Pengamatan laut bawah permukaan sampai kedalaman 1000m telah dilakukan selama Expedisi Indonesia PRIMA 2017 dengan meluncurkan instrumen Conductivity Temperature Depth (CTD). Terdapat tujuh stasiun CTD yang terletak di jalur ArusKatulistiwaSelatan (South Equatorial Current, SEC). Pengamatan atmosfer telah dilakukan dengan pelepasan balon radiosonde hingga ketinggian 17 km dan pengamatan meteorologisinoptiktiap jam di atas kapal. Makalah ini membahas analisis data kelautan bawah permukaan (suhu dan salinitas)serta konvektifitas atmosfer yang diperoleh pada saat etape I expedisi menuju 12LS 85BT untuk menyelidiki kemungkinan terusan massa air Arus Lintas Indonesia(ARLINDO) di Samudra Hindia dan kaitannya dengan dinamika pusat tekanan rendah atmosfer di Samudera Hindia barat daya Sumetera. Analisis menunjukkan bahwa terdapat interaksi timbal balik laut-atmosfer pada saat berkembangnya daerah tekanan rendah di Samudera Hindia barat daya Sumatera yaitu keberadaan kolam air yang lebih panas (>28C) dari sekitarnya yang berasosiasi dengan pusat tekanan rendah atmosfer di atasnya. Kolam air hangat berasal dari massa air intrusif yang diduga berkaitan dengan penetrasi massa air ARLINDO di Samudera Hindia. Sea sub-surface observations down to 1000m depth have been done during Expedition Indonesia PRIMA 2017 Indonesia by launching Conductivity Temperature Depth (CTD) instrument. There are seven CTD stations located on the South's Equatorial Current (SEC) pathway. Observations of the atmosphere have been done by releasing radiosonde balloons up to a height of 17 km and the hourly synoptic meteorological observation on board. This paper discusses the analysis of sub-surface marine data (temperature and salinity) as well as atmospheric convectivity obtained at the ship time of Stage I of the Expedition towards 12S 85E to investigate the possibility of Indonesia Throughflow (ITF) water masses penetration in the Indian Ocean and its relation to the dynamics of the atmospheric low-pressure center in the Indian Ocean southwest of Sumatera. The analysis shows that there is an air-sea interaction at the time of the development of the low-pressure-area in the region i.e. the presence of a warm pool region (> 28°C) associated with a low-pressure atmospheric center. The warm pool is possible came from intrusive water masses suspected to be associated with ITF's water mass penetration in the Indian Ocean.","PeriodicalId":32347,"journal":{"name":"Jurnal Meteorologi dan Geofisika","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76382524","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":"KARAKTERISTIK PASANG SURUT DI PERAIRAN PAMEUNGPEUK, BELITUNG, DAN SARMI BERDASARKAN METODE ADMIRALTY","authors":"Eko Supriyadi, S. Siswanto, Widodo S Pranowo","doi":"10.31172/JMG.V19I1.518","DOIUrl":"https://doi.org/10.31172/JMG.V19I1.518","url":null,"abstract":"Penentuan konstanta harmonik pasang surut, datum dan tipe pasang surut air laut sangat dipengaruhi oleh lokasi, posisi bulan dan matahari yang mempunyai nilai periode tersendiri setiap waktunya. Penelitian ini mengunakan data observasi pasang surut perairan Pamengpeuk, Belitung dan Sarmi bulan Juni 2016 yang diperoleh dari Badan Informasi Geospasial (BIG). Dalam artikel ini, konstanta harmonik pasang surut dihitung menggunakan metode Admiralty.  Analisis menghasilkan 8 konstanta harmonik yang selanjutnya digunakan untuk menentukan bilangan Form dan datum muka air perairan tersebut.  Karakterisasi bilangan Form menunjukkan bahwa wilayah perairan Pamengpeuk dan Sarmi memiliki tipe pasang surut campuran condong harian ganda sedangkan perairan Belitung memiliki tipe pasang surut harian tunggal. Sedangkan karakterisasi datum menggunakan analisis elevasi tinggi muka laut didapatkan hasil pada perairan Pamengpeuk. Belitung, dan Sarmi masing-masing memiliki tinggi muka air tertinggi pada saat pasang purnama yaitu 2,14 m; 3,56 m; dan 3,59 m.  Tinggi muka air terendah pada saat surut purnama masing-masing memiliki nilai 0,32m; 0,39; dan 1,70 m.","PeriodicalId":32347,"journal":{"name":"Jurnal Meteorologi dan Geofisika","volume":"79 4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87944414","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 PENGARUH SIKLON TROPIS CEMPAKA TERHADAP CURAH HUJAN DI WILAYAH JAWA","authors":"M. Habibie, Sri Noviati, Hastuadi Harsa","doi":"10.31172/jmg.v19i1.542","DOIUrl":"https://doi.org/10.31172/jmg.v19i1.542","url":null,"abstract":"","PeriodicalId":32347,"journal":{"name":"Jurnal Meteorologi dan Geofisika","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89707302","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":"Fast Marching Method Aplication for Forward Modelling of Seismic Wave Propagation","authors":"W. Srigutomo, Ghany Hanifan Muslim","doi":"10.36435/JGF.V16I3.107","DOIUrl":"https://doi.org/10.36435/JGF.V16I3.107","url":null,"abstract":"One of the classical problem in seismology is to determine time travel and ray path of seismic wave betweentwo points at a given heterogeneous media. This problem is expressed by eikonal equation and can be seen as a propagation of a wavefront and interface evolution. One of methods to solve this problem is Fast Marching Method abbreviated as FMM. This method is used to produce entropy-satisfying viscosity solution of eikonal equation. FMM combines viscosity solution of Hamilton-Jacobi equation and Huygen's Principle that centered on min-heap data structure to determine the minimum value at every loop. In this study, FMM is applied to determine time travel and raypath of seismic wave. FMM also is used to determine the location of wavesource using simple algorithm. From our forward modeling schemes, it is found that FMM is an accurate, robust, and effcient method to simulate seismic wave propagation. For further study, FMM also can be used to be a part of passive seismic inverse scheme to locate hypocenter location.","PeriodicalId":32347,"journal":{"name":"Jurnal Meteorologi dan Geofisika","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87858793","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":"Aquifer Area Investigation Using Resistivity Method in Cikopomayak, West Java, Indonesia","authors":"J. Sihotang, Rodrigo Osvaldus, Danny Bona Tua Munte, Nasib Priono, F. Mohamad","doi":"10.36435/JGF.V16I3.375","DOIUrl":"https://doi.org/10.36435/JGF.V16I3.375","url":null,"abstract":"Administratively, the research area is located in around Cikopomayak Village, Jasinga, Bogor, West Java,Indonesia. Based on the Hydrogeological and Groundwater Basin Map, this research area was classied to non-potential groundwater basin. In addition, when the summer comes, the lack of water will be happened around the area. Consequently, the water reserve wasn't enough to fulll the necessity of freshwater. Thus, the research about identifying aquifer location was needed. This research aims to determine the depth and thickness of aquifer for the alternative ways to overcome the problem, particularly, for the Cikopomayak Village. Theresearch used the geophysical method by modeling the several data such as Geoelectric 1-D to know the aquifer location based on the section of medium resistivity value. Then, the geoelectric data was correlated to the borehole drilling data that is Gamma Ray (GR) Log, Spontaneous Potential (SP) Log, Resistivity Log, and the cutting data. Commonly, the most suitable lithology for an aquifer is sandstone because of its good characteristic of permeability and porosity. Logging data result will show the small value of GR log, SP Log lean-ing to the right, and low-value resistivity for indicating the aquifer zone. Based on geoelectric data, the research zone has 3 groups of resistivity value and lithology that are shaly clay-stone and siltstone with low-value resistivity (0-50 ohm.m), sandy claystone, medium sandstone, and coarse sandstone with medium value resistivity (50-150 ohm.m), fine sand-stone, sandy claystone, and andesite with high-value resistivity (> 150ohm.m). The aquifer system in the research area was classied into 3 groups that are aquifer, aquitard, andaquiqlud.","PeriodicalId":32347,"journal":{"name":"Jurnal Meteorologi dan Geofisika","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73482956","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":"Identification of Leaching Zone in Pasirimpun Dump Station, West Java, Indonesia Using Resistivity and Induced Polarization Method","authors":"Alfin Ari Nugraha, A. A. Ilmanto, J. Jonathan, R. M. Rashad, S. Maghrifa","doi":"10.36435/JGF.V16I3.379","DOIUrl":"https://doi.org/10.36435/JGF.V16I3.379","url":null,"abstract":"The presence of dump stations around resident's houses besides resulting air pollution, it is also affectingthe cleanliness of water used by society to meet their daily needs. Location where we researched is at ex-Pasirimpun Dump Station, Karang Pamulang Village, Kecamatan Cicadas, Bandung. Although Pasirimpun Dump Station has been closed and turned function into Taman Abdi Negara, it is feared that there is a water pollution caused by leach zone. Geophysical measurements by geoelectric method are performed to prove the leaching zone. This study aims to determine the depth of the leaching zone, its position against the groundwater level, and what potential harm can caused by the leaching zone. The methodology that is used are direct observation, interviews, and literature studies. Our measurements is done by using schlumberger conguration and Induced Polarization (IP) method on morphology that tend to be at with a length of 141 meters stretch and a spaceof 3 meters. Groundwater faces are mapped to be correlated with the depth of the existing leaching zone. From the results of literature studies, there is a leaching zone in the area with a depth of about 30 meters. By knowing this leaching zone, we hope that there will be cooperation between government and society to avoidthe impacts of leaching zone on the water which they consumed. One way to know, is to drill deeper water level from the leach zone.","PeriodicalId":32347,"journal":{"name":"Jurnal Meteorologi dan Geofisika","volume":"189 6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84457533","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}