Results in Earth Sciences最新文献_第6页

Flood susceptibility mapping in Kali River Basin, Southern India: A GIS-based analytical hierarchy process modelling 印度南部Kali河流域洪水易感性制图：基于gis的分析层次过程模型

Results in Earth Sciences Pub Date : 2025-03-08 DOI: 10.1016/j.rines.2025.100079

Ananda Krishnan , S.G. Dhanil Dev , S. Arjun , V. Deepchand , Yogendra Singh , E. Shaji , P.K. Krishnaprasad

{"title":"Flood susceptibility mapping in Kali River Basin, Southern India: A GIS-based analytical hierarchy process modelling","authors":"Ananda Krishnan , S.G. Dhanil Dev , S. Arjun , V. Deepchand , Yogendra Singh , E. Shaji , P.K. Krishnaprasad","doi":"10.1016/j.rines.2025.100079","DOIUrl":"10.1016/j.rines.2025.100079","url":null,"abstract":"<div><div>Across the globe, floods are always a matter of concern for everyone due to the uncertainty of their occurrence and place. Though their prediction is still in the progress stage, there are enough methods available to identify the areas that have the potential to experience any specific kind of hazard. The present study is focused on an area located in the Uttara Kannada district of Karnataka and the South Goa district in Goa, which experienced a natural hazard for the first time in the form of the Kali River flood in 2019. The study aims to develop flood susceptibility maps for selected subbasins of the Kali River using integrated remote sensing techniques with the analytical hierarchy process system. Detailed analyses of numerous causative factors, i.e., elevation, slope, distance from the river, precipitation, flow accumulation, stream density, soil types, water ratio index, land use land cover, topographic wetness index, and stream power index, were carried out. The result shows that the area can be categorized into five zones ranging from very low to very high susceptibility to flooding. The prevalence of flooding in the study area can be attributed to increased sediment deposition, anthropogenic disturbances, land use and land cover patterns, gentle slopes, elevated soil moisture levels, reduced stream capacity, and limited soil infiltration capacity. The accuracy of the result was assessed using the receiver operating characteristic (ROC) method and confirmed the predictive capability of the generated map. Approximately 30 % of the study area falls within the highly susceptible zone. The outcome of the study provides valuable insights for urban planners and policymakers, assisting them in formulating strategies to mitigate the impact of future flood hazards and minimize the damages, particularly in southwest coast India.</div></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"3 ","pages":"Article 100079"},"PeriodicalIF":0.0,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geochemistry of podiform chromitite and host rocks within the Buem Structural Unit, Northwestern Benin Republic: Implications for the geodynamic evolution of the Dahomeyide orogenic belt 贝宁共和国西北部Buem构造单元中足状铬铁矿及其承载岩的地球化学特征：对Dahomeyide造山带地球动力学演化的启示

Results in Earth Sciences Pub Date : 2025-03-08 DOI: 10.1016/j.rines.2025.100080

Daniel N. Kouagou N’Dah , Samuel B. Olobaniyi , Luc C. Adissin Glodji , Sory I.M. Konate , Elhadji Mory Traore , Daniel Kwayisi , Clement B. N’Satta , Ibrahim S. Yerima

{"title":"Geochemistry of podiform chromitite and host rocks within the Buem Structural Unit, Northwestern Benin Republic: Implications for the geodynamic evolution of the Dahomeyide orogenic belt","authors":"Daniel N. Kouagou N’Dah , Samuel B. Olobaniyi , Luc C. Adissin Glodji , Sory I.M. Konate , Elhadji Mory Traore , Daniel Kwayisi , Clement B. N’Satta , Ibrahim S. Yerima","doi":"10.1016/j.rines.2025.100080","DOIUrl":"10.1016/j.rines.2025.100080","url":null,"abstract":"<div><div>The paper presents the geochemistry, origin and geodynamic setting of podiform chromitite and host rocks from the Buem Structural Unit (BSU) in the northwestern Benin Republic. Qualitative Scanning Electron Microscopy (SEM), quantitative Electron probe Micro Analysis (EPMA), and whole-rock geochemical investigation have been conducted on BSU chromite and mafic-ultramafic rocks. The BSU is the westernmost unit of the Dahomeyide orogenic belt. It consists mainly of metamorphosed mafic-ultramafic rock and clastic sedimentary rocks. Chromitites units are exposed within the mafic-ultramafic rocks. Qualitative SEM analyses indicated that chromitite is mainly composed of chromite and serpentine minerals. The qualitative EPMA data shows that Cr<sub>2</sub>O<sub>3</sub> and MnO contents (wt%) of spinel of the BSU varying from 35.91 to 44.53 and from 0.05 to 0.16, respectively and are typical primary Cr-spinel. The calculated parental composition of melts (13.71–16.67 wt% Al<sub>2</sub>O<sub>3</sub> and FeO/MgO values in the range 0.15–0.30) from which the BSU chromitites precipitated is very similar to MORB-type magma. The chemical composition of BSU chromites and its host rocks shows that these chromites were most likely crystallized from MORB. The magma originated as a partial melt that occurred in a Mid Ocean Ridge environment, probably during the early stage of the Pan-African orogeny at the margin of the West African Craton.</div></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"3 ","pages":"Article 100080"},"PeriodicalIF":0.0,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identifying robust precursor regions of driving parameters affecting the Accumulated Cyclone Energy in the North Indian Ocean using the Causal Effect Network 利用因果效应网络识别影响北印度洋气旋能量累积的驱动参数的强前兆区

Results in Earth Sciences Pub Date : 2025-02-27 DOI: 10.1016/j.rines.2025.100078

Akshay Kumar Sagar , Arun Chakraborty , Abhishek Kumar , Pankaj Kumar

{"title":"Identifying robust precursor regions of driving parameters affecting the Accumulated Cyclone Energy in the North Indian Ocean using the Causal Effect Network","authors":"Akshay Kumar Sagar , Arun Chakraborty , Abhishek Kumar , Pankaj Kumar","doi":"10.1016/j.rines.2025.100078","DOIUrl":"10.1016/j.rines.2025.100078","url":null,"abstract":"<div><div>There are significant variations in tropical cyclone (TC) activity every year and related casualties. The mitigation of human and property losses brought on by TCs depends heavily on the realistic forecasting of TC intensities at longer lead times. In this regard, Accumulated Cyclone Energy (ACE) is the most appropriate measure to access cyclone energy. The study examines the association between ACE and other driving parameters influencing its variability and identifies the robust precursor regions using modern-day machine learning techniques. Initially, the correlation between ACE and driving variables (vertical wind shear, sea surface temperature, specific humidity, tropical cyclone heat potential, relative vorticity, and total column water vapor availability) is assessed. The analysis demonstrates a significant robust association between ACE and associated driving factors over the main cyclogenesis regions. Subsequently, an innovative K-means clustering process and the Causal Effect Network (CEN) based technique employing the PCMCI algorithm are utilized to investigate the relationship among the clustered regions of variables and ACE. Finally, the main contributing regions (MCR) accountable for affecting the changes in the ACE values in the basin are identified. The causal and cluster graphs illustrate the MCRs that exert direct or indirect substantial influence on ACE value. These fluctuations results are caused by the variations of atmospheric and oceanic parameters. These methods may be useful for policymakers and researchers in precise prediction, tracking cyclones, and identifying areas that affect future cyclogenesis.</div></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"3 ","pages":"Article 100078"},"PeriodicalIF":0.0,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrated aeromagnetic and airborne radiometric analysis for structural mapping and mineralisation potential in the Naraguta Area, North-Central Nigeria 尼日利亚中北部Naraguta地区构造测绘和矿化潜力的综合航空磁和航空辐射分析

Results in Earth Sciences Pub Date : 2025-02-24 DOI: 10.1016/j.rines.2025.100077

Mubarak Umar Faruk, Solomon Nehemiah Yusuf, Raymond Ishaya Daspan

{"title":"Integrated aeromagnetic and airborne radiometric analysis for structural mapping and mineralisation potential in the Naraguta Area, North-Central Nigeria","authors":"Mubarak Umar Faruk, Solomon Nehemiah Yusuf, Raymond Ishaya Daspan","doi":"10.1016/j.rines.2025.100077","DOIUrl":"10.1016/j.rines.2025.100077","url":null,"abstract":"<div><div>This research provides insights into the structural settings and geochemically altered zones within Naraguta and its environs. Various enhancement techniques were employed to identify the edges of structures controlling the magnetic field direction, the location, and the morphology of causative bodies. Source parameter imaging was used to analyse the depth of magnetic sources. Radiometric data processing was performed to identify alteration zones. Maps such as the K/Th and K/U, as well as the U/Th and U/K ratio maps, and a normalised ternary map were generated. From the magnetic analysis. Intrusions such as the Neil's Valley granite porphyry and Naraguta quartz pyroxene-fayalite-porphyry were delineated, along with rhyolites and pyroclastics. The study area’s structures predominantly trend northeast-southwest, with additional orientations reflecting Pan-African orogeny structures, which may be linked to hydrothermal deposits. In addition, these could be related to different geological processes, such as faulting, jointing, or regional stress patterns. They can lead to structural alignments even in non-orogenic environments like the Younger Granites. The K/Th ratio values of 0.20 % ppm<sup>−1</sup>were identified above the expected background in an acidic environment, implying possible mineralisation such as tin and its associates as well as rare earths. Geochemical alteration zones were present in various parts of the area in alignment with magnetic lines, implying mineralisation potential.</div></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"3 ","pages":"Article 100077"},"PeriodicalIF":0.0,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative analysis of heatwaves and heat stress in six climatic zones of India based on observed data 基于观测资料的印度6个气候带热浪和热应力的比较分析

Results in Earth Sciences Pub Date : 2025-02-22 DOI: 10.1016/j.rines.2025.100076

Priyankar Kumar, Arun Chakraborty

{"title":"Comparative analysis of heatwaves and heat stress in six climatic zones of India based on observed data","authors":"Priyankar Kumar, Arun Chakraborty","doi":"10.1016/j.rines.2025.100076","DOIUrl":"10.1016/j.rines.2025.100076","url":null,"abstract":"<div><div>The global phenomenon of climate change has led to the increasing occurrence of heatwaves, significantly escalating heat stress and discomfort. Presently, heatwaves are intensifying in terms of frequency, duration, and severity, causing adverse effects such as increased illnesses, human mortality, and forest fires, both in India and globally. This study investigates six climatic zones in India—Arid, Semi-arid, Montane, Humid subtropical, Tropical wet, and Tropical wet & dry—over 31 years (1990–2020), focusing on the summer season. Daily maximum temperature, relative humidity, wind speed, and solar radiation were used to analyze heatwaves, while the Universal Thermal Climate Index (UTCI) and Humidity Index (HD) measured heat stress and discomfort. Our study shows heatwaves are most prevalent in Semi-arid, Montane, and Humid subtropical zones. These zones exhibited a respective increase of (10.94 %, 21.35 %, and 7.03 %), (11.62 %, 22.03 %, and 7.70 %), and (11.76 %, 22.16 %, and 7.84 %) of heatwave events compared to the Arid, Tropical wet, as well as Tropical wet and dry zones respectively. In April 2010, India experienced widespread heatwaves, except tropical wet zone. The Tropical wet zone experienced minimal heat waves, with individuals facing moderate discomfort and heat stress. Thermal stress impacts were greater in the eastern coastal regions of the Tropical wet and dry climates, with notable instances of great discomfort, strong and very strong stress, and dangerous conditions, potentially leading to heat stroke. However, similar stress levels were also observed in the Arid, Semi-arid, and Humid subtropical zones, particularly in May, June, and July.</div></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"3 ","pages":"Article 100076"},"PeriodicalIF":0.0,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolution of Char lands in the Padma River in Bangladesh and its impacts on planform morphology of the river 孟加拉国帕德玛河中查尔土地的演变及其对河流平面形态的影响

Results in Earth Sciences Pub Date : 2025-02-18 DOI: 10.1016/j.rines.2025.100075

MD. Raihanul Islam, Shovon Mohonto, Fahmida Noor

{"title":"Evolution of Char lands in the Padma River in Bangladesh and its impacts on planform morphology of the river","authors":"MD. Raihanul Islam, Shovon Mohonto, Fahmida Noor","doi":"10.1016/j.rines.2025.100075","DOIUrl":"10.1016/j.rines.2025.100075","url":null,"abstract":"<div><div>This paper examines the morphological evolution of the Char lands of the Padma River and its impact on planform morphology of the Padma. Drivers of the morphological evolution are also investigated. The study utilizes geospatial data derived from remotely sensed images taken between 1962 and 2022. Development through huge accretion and erosion in the Harirampur Char, repeated movement of Amirabad Char from the left bank to the right bank, and straight geomorphological connectivity between Paler Char and Chhitar Char were the main occurrences in the Char lands of the Padma. The morphological changes in Char lands are seen to enforce changes in the banklines around them and, in some cases, in the other co-existing Char lands. The expansion rate of Harirampur Char and the erosion rate in the banks around the Char were mutually related in a half-decadal delay mode. Due to this enforcement, the cyclic evolutions of Char lands contributed to the repeating channel pattern of the Padma. The dynamics of the Ganges-Jamuna confluence enhanced the morphological changes of the Padma, particularly in the upstream segment. High-magnitude floods contributed to making the morphological pattern of the Padma unstable.</div></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"3 ","pages":"Article 100075"},"PeriodicalIF":0.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Source identification and geochemical characteristics of surface and groundwater from Larji-Rampur window, Himachal Himalaya: Implications for socio-environmental perspectives 喜马偕尔-喜马拉雅地区Larji-Rampur窗口地表水和地下水的来源识别和地球化学特征：社会环境视角的影响

Results in Earth Sciences Pub Date : 2025-02-15 DOI: 10.1016/j.rines.2025.100074

Shruti Rana , Shubham Choudhary , Sameer K. Tiwari , Jairam Singh Yadav , Rajesh Sharma

{"title":"Source identification and geochemical characteristics of surface and groundwater from Larji-Rampur window, Himachal Himalaya: Implications for socio-environmental perspectives","authors":"Shruti Rana , Shubham Choudhary , Sameer K. Tiwari , Jairam Singh Yadav , Rajesh Sharma","doi":"10.1016/j.rines.2025.100074","DOIUrl":"10.1016/j.rines.2025.100074","url":null,"abstract":"<div><div>Understanding water quality and its interaction with the litho-units is essential for human activity and socio-environmental development. This study focused on surface, groundwater, and thermal springs water in the Larji-Rampur Window (LRW), Himachal Himalaya, with results revealing that the water was alkaline with an average pH of 7.91. The TDS ranged from 16.38 to 367.92 mg/L, while electrical conductivity (EC) varied between 26 and 584 µS/cm. Calcium (Ca<sup>2 +</sup>) dominated the major cations (208–2424 µE), followed by magnesium (Mg<sup>2+</sup>), sodium (Na<sup>+</sup>), and potassium (K<sup>+</sup>), with bicarbonate (HCO₃⁻) being the main anion (200–3000 µE). Mixing diagrams, Gibbs plot, and ionic ratios indicated carbonate weathering as the primary factor, with contributions from silicate weathering. The first factor of principal component analysis (PCA) explains 66.44 % of the variance, indicating carbonates as the primary source of dissolved loads in the basin, with contribution from silicate weathering. The isotopic analysis (δ<sup>18</sup>O and δD) showed the samples’ alignment along the Global Meteoric Water Line (GMWL), with a slight compositional shift due to water-rock interactions. The δ<sup>13</sup>C values (-13.7 to −3.6 ‰), suggested their derivation from associated carbonate rocks. Lithium (Li), strontium (Sr), and iron (Fe) were identified at higher-than-permissible limits in groundwater and thermal springs of Garsah and Parvati Valley. Arsenic levels in geothermal springs reached 48.79 ppb, exceeding WHO guidelines. This study underscores the presence of hazardous elements threatening human health and emphasizes the importance of geological influences on water quality. This work further advocates the need for regular monitoring and management strategies to mitigate risks associated with trace element contamination.</div></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"3 ","pages":"Article 100074"},"PeriodicalIF":0.0,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel PFG-NMR method to determine CO2 solubility in geological carbon storage 一种新的PFG-NMR方法来测定二氧化碳在地质碳储存中的溶解度

Results in Earth Sciences Pub Date : 2025-02-15 DOI: 10.1016/j.rines.2025.100071

Heng Wang , Shouchuan Wang , Yunfei Li , Zuhao Kou , Linghong Fan , Zemin Ji , Vladimir Alvarado , Lei Wang

{"title":"A novel PFG-NMR method to determine CO2 solubility in geological carbon storage","authors":"Heng Wang , Shouchuan Wang , Yunfei Li , Zuhao Kou , Linghong Fan , Zemin Ji , Vladimir Alvarado , Lei Wang","doi":"10.1016/j.rines.2025.100071","DOIUrl":"10.1016/j.rines.2025.100071","url":null,"abstract":"<div><div>Solubility is a dominant trapping mechanism for geological carbon storage (GCS). CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> dissolution into aquifer water, mainly affected by formation pressure, temperature and salinity, which in turn regulate water molecules self-diffusion coefficient(D<span><math><msub><mrow></mrow><mrow><mn>0</mn></mrow></msub></math></span>). Here we measured CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> solubility in DI water, in 50 kppm and 100 kppm NaCl solutions at different pressures and temperatures. Then, a self-diffusion coefficient experiment, using the pulsed-field gradient nuclear magnetic resonance (PFG-NMR) technique, was conducted to investigate how the different conditions affect CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> dissolution. Results show that the diffusion coefficient in aqueous phase containing dissolved CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> increases with temperature, and decreases inversely with pressure, due to increased CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> dissolution. Additionally, clear, well-defined correlations between D<span><math><msub><mrow></mrow><mrow><mn>0</mn></mrow></msub></math></span> and the CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> dissolved fraction were found in all experiments. These correlations gave rise to a novel method to assess CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> solubility by measuring D<span><math><msub><mrow></mrow><mrow><mn>0</mn></mrow></msub></math></span> via PFG-NMR. This method is fast and provides an assessment of solubility trapping during GCS site screening or storage processes.</div></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"3 ","pages":"Article 100071"},"PeriodicalIF":0.0,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geotechnical and geological characterization of the Meskani Mine Complex, Yazd Block, Central Iran: A multidisciplinary study 伊朗中部亚兹德区块梅斯卡尼矿区的岩土工程和地质特征：多学科研究

Results in Earth Sciences Pub Date : 2025-02-14 DOI: 10.1016/j.rines.2025.100072

Ahmad Adib , Pooria Kianoush

{"title":"Geotechnical and geological characterization of the Meskani Mine Complex, Yazd Block, Central Iran: A multidisciplinary study","authors":"Ahmad Adib , Pooria Kianoush","doi":"10.1016/j.rines.2025.100072","DOIUrl":"10.1016/j.rines.2025.100072","url":null,"abstract":"<div><div>The Meskani Mine Complex in Central Iran presents significant challenges due to its complex geological and geotechnical characteristics, which can impact mining operations and structural integrity. This study aims to provide a comprehensive geotechnical and geological assessment of the site, focusing on soil and rock properties, seismicity, and hydrogeological conditions. The primary objective is to develop a geotechnical zoning map that incorporates parameters such as unconfined compressive strength (UCS), porosity, permeability, and resistance to inform safe and efficient mining practices. To achieve this, 15 boreholes were drilled to a depth of 15 m, and various geotechnical tests—including UCS, direct shear, and permeability tests—were conducted. The results revealed significant variability in soil and rock properties—with UCS values ranging from 1.25 MPa to 17 MPa—indicating areas that may require reinforcement. The study also identified low-permeability mudstones and marls—which can lead to increased pore water pressure and potential slope instability—particularly during heavy rainfall events. Seismic analysis indicated that the site is located in a region with a peak ground acceleration (PGA) of 0.30 g for a 475-year return period, which necessitates the incorporation of seismic design principles in construction. The findings underscore the importance of tailored foundation designs, with allowable bearing capacities estimated at 200 kPa for competent strata, along with recommendations for deep foundations in weaker areas. This research contributes valuable insights into the geotechnical and geological characteristics of the Meskani Mine Complex, offering a foundation for future mining operations and environmental management.</div></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"3 ","pages":"Article 100072"},"PeriodicalIF":0.0,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Morphological changes and their impact on the resident’s livelihood patterns of Char Munshi, lower Meghna estuary, Bangladesh 孟加拉国梅克纳河河口下游查蒙什的形态变化及其对居民生计模式的影响

Results in Earth Sciences Pub Date : 2025-02-11 DOI: 10.1016/j.rines.2025.100073

Anika Haque, Syeda Ayshia Akter, Md Ashir Morshed Pial, Abdul Kadir , Zia Ahmed

{"title":"Morphological changes and their impact on the resident’s livelihood patterns of Char Munshi, lower Meghna estuary, Bangladesh","authors":"Anika Haque, Syeda Ayshia Akter, Md Ashir Morshed Pial, Abdul Kadir , Zia Ahmed","doi":"10.1016/j.rines.2025.100073","DOIUrl":"10.1016/j.rines.2025.100073","url":null,"abstract":"<div><div>This study investigates the morphological changes in Char Munshi, located along the lower Meghna River, Bangladesh, over the past 34 years (1989–2023) and their impact on the livelihoods of the local population. Analysis of Landsat satellite imagery, combined with social surveys, reveals that despite ongoing land erosion, significant land accretion has occurred during this period. A notable event in 1999 saw the highest erosion rate, resulting in a 25.14 km<sup>2</sup> land loss. Over the study period, the island's area expanded approximately 42-fold, from an initial 2.44 km<sup>2</sup> in 1989 to its current size. The accretion of land positively impacted livelihood by increasing the farmland. On the other hand, frequent riverbank erosion displaced the people, damaged their property, and reduced their long-term economic stability and social security. The findings reveal that the livelihoods of people living in the Charland are primarily dependent on agriculture and fishing. However, challenges such as erosion and cyclones disrupt their way of life, pushing many into secondary or alternative jobs. These hardships also contribute to increased school dropouts, early marriages among girls, and a rise in crime and violence, which are closely linked to economic constraints and the lack of sufficient job opportunities. This study underscores the critical need for targeted economic support, crop and land insurance, and robust erosion control measures, which are essential for bolstering the resilience of Char Munshi's vulnerable population and promoting the sustainable development of its communities.</div></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"3 ","pages":"Article 100073"},"PeriodicalIF":0.0,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0