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Mapping of Potential Groundwater Recharge Zones in the Kolleru Lake Catchment, India, by Using Remote Sensing and GIS Techniques 认领
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作者 Meena Kumari Kolli Christian Opp Michael Groll 《自然资源(英文)》 2020年第3期127-145,共19页
Water scarcity is the major problem in India where the population has been tremendously increasing, which results in invading natural resources, thus affects on hydrological processes. Because of this, significant sur... Water scarcity is the major problem in India where the population has been tremendously increasing, which results in invading natural resources, thus affects on hydrological processes. Because of this, significant surface water bodies have been disappearing continuously. Therefore, more pressure on groundwater resources is a consequence of that. The integration of remote sensing and geographical information system (GIS), which helps in groundwater research for the investigation of potential groundwater availability, is essential to assess, monitor, and conserve groundwater resources. This analysis reports on the mapping of various potential groundwater resources in the Kolleru Lake catchment, India, by using remote sensing and GIS techniques. For this, a survey of India toposheets and IRC-1C satellite imageries was used to prepare thematic layers of geomorphology, drainage density, lineament, slope, land-use, soil, rainfall, and NDVI converted into raster format in ArcGIS. The raster maps of these thematic layers were assigned to a weight-based factor depending on the catchment characteristics and its topographic influence. The results demonstrated that about 7% of the area is under excellent groundwater potential recharge. Good, moderate, and lower potential conditions are 42%, 38%, and 13%, respectively. The results indicated that the management of groundwater potential zones should be targeted on the middle-catchment region. Further, the results were validated with the borehole data obtained from the Government of Andhra Pradesh-Groundwater Department. These results are useful for better both planning and groundwater management sources in the Kolleru Lake catchment. 展开更多
关键词 Groundwater POTENTIAL ZONES Kolleru LAKE CATCHMENT INDIA Remote Sensing GIS Weighted OVERLAY Analysis
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Delineation of potential groundwater zones based on multicriteria decision making technique 认领
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作者 Dinagarapandi Pandi Saravanan Kothandaraman Mohan Kuppusamy 《地下水科学与工程:英文版》 2020年第2期180-194,共15页
Groundwater is the most prioritized water source in India and plays an indispensable role in India’s economy. The groundwater potential mapping is key to the sustainable groundwater development and management. A hybr... Groundwater is the most prioritized water source in India and plays an indispensable role in India’s economy. The groundwater potential mapping is key to the sustainable groundwater development and management. A hybrid methodology is applied to delineate potential groundwater zones based on remote sensing, geographical information systems(GIS) and analytic hierarchy process(AHP) as on multicriteria decision making. For the purpose of demonstrating field application, Chittar watershed, Tamilnadu, India is studied as an example. The important morphological characteristics considered in the study are lithology, geomorphology, lineament density, drainage density, slope, and Soil Conservation Service–Curve Number(SCS-CN). These six thematic layers are generated in a GIS platform. Based on intersecting the layers, AHP method, the values for adopting the pairwise comparison normalized weight and normalized subclasses weightage were given. The normalized subclass weightage is input into each layer subclass. Then, weighted linear combination method is used to add the data layers in GIS platform to generate groundwater potential Index(GWPI) map. The GWPI map is validated based on the net recharge computed from the differences of measured groundwater levels between the pre-monsoon and post-monsoon in the year 2018. The kappa statistics are used to measure level spatial consistency between the GWPI and net recharge map. The overall average spatial matching accuracy between the two data sets is 0.86, while the kappa coefficient for GWPI with net recharge, 0.78. The results show that in Chittar watershed about 870 km~2 area is divided into high potential zone(i.e. sum of very high and high potential zone), 667 km~2 area, as the moderate one and the rest 105 km~2 area, as the poor zone(i.e. sum of very poor and poor potential zone). 展开更多
关键词 Potential groundwater zone Chittar watershed Analytic hierarchy process Groundwater potential index
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Hydrochemical Evaluation of Molybdenum Content of the Groundwater Aquifer System in Northern Jordan 认领
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作者 Tasneem H Hiasat Omar A. Rimawi Issa M. Makhlouf 《水资源与保护(英文)》 2020年第3期223-239,共17页
The groundwater quality of Wadi Al Arab aquifer, northwest Jordan, was assessed for its high molybdenum concentrations, which reach 1.62 mg/L. This value of Mo-concentration was far beyond the Jordan Institution for S... The groundwater quality of Wadi Al Arab aquifer, northwest Jordan, was assessed for its high molybdenum concentrations, which reach 1.62 mg/L. This value of Mo-concentration was far beyond the Jordan Institution for Standards and Metrology (JISM) and World Health Organization (WHO) guidelines. Hydro-geochemical studies were carried out in order to assess the chemistry of the groundwater quality focusing on identifying the hydrogeochemical processes and mechanisms that are involved in the high Mo concentration. The water quality data of Wadi Al Arab boreholes (1986-2018) was collected, and the dataset analyzed. Interpretation of hydrochemical data showed that the anions are dominated by? ?with abundance order of?, while the main cation is Ca2+, with abundance order of Ca2+ > Mg2+ > Na+ > K+;water type is . The reason is the passage of groundwater through carbonate rocks. The distribution of the sampling points in the Gibbs diagram showed that the majority of samples are plotted within the field of rock weathering, which indicates that the main factor controlling dissolved hydrochemical components of the water samples is the dissolution of the rock-forming minerals. The scattered plot of the Mo with other critical heavy metals shows two different trend lines suggesting initiation of molybdenum to groundwater which is probably derived from oil shale and phosphate. The effects of pH and redox potential on Mo mobility in water are reviewed using the paurbaix diagram. The Mo species of the sampled wells are confined to the field of : anoxic/non-sulfidic condition (Fe reduction) which is located in the unconfined part of the aquifer, and which is sulfidic condition (low and high) in the confined aquifer. 展开更多
关键词 MOLYBDENUM Hydrogeochmistry GROUNDWATER WADI Al-Arab
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Study of the Hydro-Chemical and Bacteriological Well Water Characteristics of M’Bahiakro (Central-Eastern Côte d’Ivoire) 认领
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作者 Hervé A. N’cho Innocent K. Kouame +5 位作者 Kouadio Koff Lazare K. Kouass? Séraphin K. Konan Ruth Ba? Andrei Sandu Ion Sandu 《地球科学和环境保护期刊(英文)》 2020年第4期32-46,共15页
The use of well water by disadvantaged populations in most African cities often presents health risks. The purpose of this study is to determine the physico-chemical and microbiological quality of M’bahiakro well wat... The use of well water by disadvantaged populations in most African cities often presents health risks. The purpose of this study is to determine the physico-chemical and microbiological quality of M’bahiakro well water. A series of physico-chemical, microbiological and piezometric analyses were carried out on the well water in the area. The results of these analyses were processed using Piper and Schoeller-Berkaloff diagrams and the software R 3.1.2 for Principal Component Analysis. Physico-chemical analysis results show that the water has an average temperature of 28&#176C. They are acidic, with a pH that generally varies from 4 to 6. M’bahiakro well waters are highly mineralized, with an average electrical conductivity of 369.1 μS/cm and 984.1 μS/cm and pass from sodium and potassium chlorinated facies in the dry season (February) to sodium chlorinated facies in the rainy season (October) with K+, Na+ and NO3- ions dominating. These ions would be the result of soil rainfall and the intervention of anthropogenic activities in the pollution of shallow groundwater. Bacteriological results exploitation shows that the well waters studied host high densities of enteritis bacteria (E. coli, Fecal streptococcus, and Clostridium perfringens) during the rainy period (October). M’Bahiakro’s well water is of poor quality and unsuitable for human consumption without prior treatment. However, they deserve particular attention and would require further treatment in rainy periods. 展开更多
关键词 WELL GROUNDWATER HYDROCHEMISTRY MICROBIOLOGY
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Modelling Nitrate Pollution Vulnerability in the Brussel’s Capital Region (Belgium) Using Data-Driven Modelling Approaches 认领
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作者 Marnik Vanclooster Sébastien Petit +1 位作者 Patrick Bogaert Arlette Lietar 《水资源与保护(英文)》 2020年第5期416-430,共15页
Groundwater vulnerability for nitrate pollution of groundwater in the Brussel’s Capital Region was modelled using data-driven modelling approaches. The land use in the study area is heterogeneous. The South South-Eas... Groundwater vulnerability for nitrate pollution of groundwater in the Brussel’s Capital Region was modelled using data-driven modelling approaches. The land use in the study area is heterogeneous. The South South-Eastern part of the region is forested, while the remaining part is urbanised. Groundwater nitrate concentration data were determined at 48 measurement stations distributed over the study area. In addition, oxygen and nitrogen isotope concentration of the nitrates were determined. The data show that the groundwater body is degraded, particularly in the urbanised part of the study area. The contamination with nitrates at degraded stations is slightly decreasing, while the opposite is true for the nitrate contamination at the less degraded stations. We modelled the contamination and trends of nitrate contamination using linear and non-linear statistical modelling techniques. In total, we defined 23 spatially distributed proxy variables that could explain nitrate contamination of the groundwater body. These proxy variables were defined at the grid size of 10 m, and averaged over the influence zone of each measurement station. The influence zones were identified using a simplified particle tracking algorithm from the groundwater piezometric map. The calculated influence zones were consistent with results obtained from a detailed numerical groundwater flow and transport model. Stepwise regression allowed explaining 56% of the observed variability of nitrate contaminations, while non-linear artificial neural network modelling allows explaining nearly 60% of the variability. The dominant explaining variables are the percentage of impermeable surface, the percentage of the sewage system that is in a degradation state, the number of urban infrastructure construction permits with a high pollution risk, the size of the influence zone, and the depth of the groundwater sampling. These results illustrate the important role of urban infrastructure on groundwater degradation and are consistent with the isotopic signat 展开更多
关键词 NITRATE CONTAMINATION Groundwater VULNERABILITY Machine Learning NITRATE ISOTOPE TRACING
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Influence of Land Use Land Cover Change on Groundwater Recharge in the Continental Terminal Area of Abidjan, Ivory Coast 认领
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作者 Kouakou Koffi Abdelaziz Yalo Nicaise +5 位作者 Luc Séguis Isma?la Ouattara Ouédraogo Moussa Kouamé Auguste Bamory Kamagaté Koné Diakaria 《水资源与保护(英文)》 2020年第5期431-453,共23页
The process by which rainfall reaches the aquifer in a sedimentary area is infiltration. This process could be affected quantitatively or qualitatively by the changes in the land use land cover (LULC) as a result of a... The process by which rainfall reaches the aquifer in a sedimentary area is infiltration. This process could be affected quantitatively or qualitatively by the changes in the land use land cover (LULC) as a result of anthropogenic activities which could affect groundwater reserves. This study focuses on the influence of LULC change on groundwater recharge in the context of urbanization and population growth. Four weather stations data and satellite image data were used in order to evaluate water infiltration which is the amount of water that reaches the piezometric surface from 1990 to 2016. The spatial-temporal LULC change in relation to urbanization sprawl was assessed based on a series of Landsat images for 1990, 2000 and 2016. The maximum likelihood pixel-based on classification method was used to analyze the spatial-temporal LULC dynamics. The Thiessen polygon method was used for the mean area precipitation computation. The recharge was determined using water balance method after determining the runoff based on the Soil Conservation Service curve number method. The results show an increase in built-up and agricultural land, while the forest and shrub areas declined with water body remaining unchanged over the period 1990-2016. The decline in forest could be imputed to the demographic and socio-economic growth as expressed by the expansion of agriculture and urbanization. Groundwater recharge and runoff results are respectively 34%, 20% in 1999;21%, 46% in 2000 and 26%, 14% in 2016 of rainfall and show their strong dependence on precipitation and LULC change. 展开更多
关键词 Groundwater RECHARGE RUNOFF LULC SCS Curve Number CONTINENTAL Terminal ABIDJAN
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Impact of Agricultural Inputs on Groundwater Pollution in Off-Season Rice Farming in the Pic of Sindou Perimeter in Burkina Faso 认领
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作者 Bama Nati A?ssata Delphine Barké Guida Habiba +2 位作者 Koita Mahamadou Niang Dial Yacouba Hamma 《水资源与保护(英文)》 2020年第5期381-388,共8页
Burkina Faso, an 80% agricultural country, today copes the massive use of agricultural inputs to boost productivity. However, these pesticides are sources of pollution of water resources. This is how, the objective of... Burkina Faso, an 80% agricultural country, today copes the massive use of agricultural inputs to boost productivity. However, these pesticides are sources of pollution of water resources. This is how, the objective of this work was to take stock of the inputs used on the Pic of Sindou rice perimeter and to characterize the vulnerability of the aquifer to these products. The study took place from February to September 2019, where two hundred farmers of the perimeter were investigated on the type and quantity of fertilizers and pesticides used in off-season rice farming activities. The DRASTIC method was used to map the vulnerability of the groundwater resource to these pollutants. Producers use NPK and Urea at 90% and 10% to the organic manure as fertilizers, and herbicides and insecticides with the actives ingredient are Glyphosate, Dimethoate and 2.4 D amine salt. The vulnerability to agricultural pollution of the aquifer remains low, but the risk of contamination from pesticides remains possible. 展开更多
关键词 Groundwater PESTICIDE HERBICIDE Pollution Off Season RICE Growing
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论抽水的降落漏斗范围、影响半径与环境影响范围 认领
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作者 王军辉 王峰 《水利学报》 EI CSCD 北大核心 2020年第7期827-834,共8页
针对降落漏斗范围、影响半径与环境影响范围等3个既有联系又有区别的水文地质问题,从其科学性和实用性两个角度,开展了系统研究工作。首先,针对降落漏斗范围,通过一般的数学模型进行了深入的理论研究,研究结论得到了Dupuit模型和Theis... 针对降落漏斗范围、影响半径与环境影响范围等3个既有联系又有区别的水文地质问题,从其科学性和实用性两个角度,开展了系统研究工作。首先,针对降落漏斗范围,通过一般的数学模型进行了深入的理论研究,研究结论得到了Dupuit模型和Theis模型等2个成熟井流模型的验证。然后,针对影响半径,在国内外经典文献基础上,以地下水动力学发展史为主线,对其理论基础进行了科学分析,着重分析了其模型基础和几何意义,梳理了其理论上的不足和主要存在争议之处,进而分析了其适用性和实用性,同时对非Thiem模型中的广义影响半径也进行了类似研究,得到了关于各类井流模型影响半径的一般共性认识。最后,结合抽水的环境风险评估和环境监测的需要,提出了“抽水环境影响范围”概念(包括一、二类环境影响范围)和一般求解方法,并根据实际应用需要,提出了Theis模型环境影响范围的解析解,其科学性和实用性得到了一个实际典型案例的验证。 展开更多
关键词 地下水 井流 降落漏斗 影响半径 Dupuit公式 Theis公式 环境影响
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潍坊南部山区地下水赋存规律及地电特征研究 认领
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作者 马健 《水文》 CSCD 北大核心 2020年第1期7-12,共6页
通过对潍坊南部山区水文地质条件进行详细研究,根据研究区地下水赋存特征,将地下水类型划分为第四系孔隙水、碳酸盐岩类裂隙岩溶水和基岩裂隙水三类。根据研究区地貌类型,孔隙水划分为山前坡洪积扇和近山前冲洪积平原两种类型;根据研究... 通过对潍坊南部山区水文地质条件进行详细研究,根据研究区地下水赋存特征,将地下水类型划分为第四系孔隙水、碳酸盐岩类裂隙岩溶水和基岩裂隙水三类。根据研究区地貌类型,孔隙水划分为山前坡洪积扇和近山前冲洪积平原两种类型;根据研究区岩溶发育类型,岩溶水划分为岩性接触溶蚀带型、层状岩溶裂隙带型及岩溶溶蚀破碎带型;根据研究区含水裂隙成因,裂隙水划分为风化裂隙水、构造裂隙水和成岩裂隙水三类。本文对研究区内各类地下水的赋存规律进行研究,初步总结了各类地下水的地电特征,为区内地下水资源的合理开发利用提供科学依据。 展开更多
关键词 地下水 水文地质 地下水赋存规律 地电特征
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塔里木河下游荒漠河岸林地下水蒸散发 认领
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作者 孙海涛 陈亚鹏 +2 位作者 陈亚宁 张颖 何振磊 《干旱区研究》 CSCD 北大核心 2020年第1期116-125,共10页
通过对塔里木河下游4个观测点地下水位的监测和地下水蒸散发的估算,分析荒漠河岸林地下水位月和日的波动、地下水蒸散发(ET_g)的时空变化及其主要影响因素。结果表明:①在生态输水前(7月21日至8月12日),4个观测点地下水位呈整体下降趋势... 通过对塔里木河下游4个观测点地下水位的监测和地下水蒸散发的估算,分析荒漠河岸林地下水位月和日的波动、地下水蒸散发(ET_g)的时空变化及其主要影响因素。结果表明:①在生态输水前(7月21日至8月12日),4个观测点地下水位呈整体下降趋势;而生态输水后,水位保持稳定上升趋势。在整个观测期内,地下水位都表现出明显的昼夜波动现象。②ET_g均呈现出单峰变化特征,08:00开始快速增加,在12:00-16:00维持在一个较高水平上,18:00以后快速下降,最高值出现在当地时间14:00。③ET_g随着植被类型、覆盖度的不同而存在显著差异,同时又受地下水位埋深的影响。④太阳辐射、温度和饱和水气压差是影响塔里木河下游地下水蒸散发日变化的主要因素,风速对其无显著影响。 展开更多
关键词 地下水 蒸散发 地下水位 荒漠河岸林 塔里木河下游
Groundwater Flow Modeling for Qushtapa Plain Unconfined Aquifer in Southern Erbil Basin, Kurdistan Region, Iraq 认领
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作者 Shwan Seeyan 《地球科学和环境保护期刊(英文)》 2020年第3期116-132,共17页
Increasing population growth and water demand for various purposes such as irrigation, domestic and industrial production in many parts of the Kurdistan Region is causing deficit in fresh water and rising groundwater ... Increasing population growth and water demand for various purposes such as irrigation, domestic and industrial production in many parts of the Kurdistan Region is causing deficit in fresh water and rising groundwater dependence. Drilling many deep wells in the area unsystematically and continuously increased pumping water from groundwater reservoirs results in lowering of water table. Therefore, it is essential to assess the management of water resources. The study focuses on the groundwater modeling for the Qushtapa District plain area in particular under steady state flow conditions. The aquifer was simulated under unconfined condition and is represented by a single layer of 100 m thickness. MODPATH was used to measure contamination track lines and travel times. This approach involved the introduction of particles at sources of contaminants in the wells and the recharge area, then the identification of the path lines and the determination of the special distribution of contaminants through steady state flow conditions. The simulation of the groundwater head shows that the groundwater head starts from the northeastern part of the plain and decreases towards Lesser Zab River in the south of the plain from 420 m to 140 m above sea level. The modeled layer was calibrated under steady state conditions using hydraulic parameters obtained from observation and pumping wells. The calibrated model is effective in producing steady-state groundwater head distribution and good compliance with observed data. The standard error was estimated as 4.88 m, the normalized root mean square error is 8.3% and the residual mean is 15.79 m. The results of the forward tracking show the source of potential pollutants from the recharge area after different travel time, the particles released at the northern boundary travels to the center and the western part toward the pollution sources. The results of the backward tracking show that the particles located in the extraction wells moved toward the recharge area in the north and northeastern 展开更多
关键词 Unconfined AQUIFER GROUNDWATER Model STEADY-STATE Flow Conditions Kurdistan REGION
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西北地区地下水水量-水位双控指标确定研究——以民勤盆地为例 认领
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作者 王晓玮 邵景力 +2 位作者 王卓然 崔亚莉 张秋兰 《水文地质工程地质》 CAS CSCD 北大核心 2020年第2期17-24,共8页
地下水是西北内陆河流域干旱半干旱地区重要的供水水源、生态因子和环境因子。当前缺乏针对西北干旱半干旱地区特点的地下水水量和水位双控管理指标确定方法研究,无法为西北地区开展流域水资源管理生态保护提供技术支撑。本研究基于地... 地下水是西北内陆河流域干旱半干旱地区重要的供水水源、生态因子和环境因子。当前缺乏针对西北干旱半干旱地区特点的地下水水量和水位双控管理指标确定方法研究,无法为西北地区开展流域水资源管理生态保护提供技术支撑。本研究基于地下水可持续利用和生态保护的原则,提出了一套确定西北地区地下水水量-水位双控指标的技术方案。采用“以位定量”的思路,依据指标监测井代表的不同地下水功能区的地下水管理水位,确定水位指标区间值;将通过天然植被排泄的地下水量作为不可袭夺的排泄项,以数值模拟方法预报求解满足水位指标约束的地下水开采量,计算水量指标区间值。以民勤盆地为研究区开展示例研究,依据技术方案计算得到水位指标的下限阈值为埋深5.00~49.37 m,上限阈值为埋深0.00~5.00 m,水量指标上限为6000×104 m 3/a,下限为10000×104 m 3/a。采用2012—2016年区内实际开采量和监测水位变化趋势进行验证,当开采量在水量指标区间内运行时,水位也基本在水位指标区间内变化。该技术方法可以为西北地区开展双控管理提供一定的技术支撑。 展开更多
关键词 西北地区 地下水位 双控指标 地下水数值模型 民勤盆地
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基于Visual MODFLOW地下水位预测研究 认领
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作者 常翠 马超 郑金城 《四川建材》 2020年第2期175-177,共3页
地基基础设计中,地下水是最活跃、复杂且难把握的因素。地下水受季节、环境影响较大,在建筑物的使用年限内地下水位是波动的,较大的地下水位变化可能引起地基失稳、基础破坏,从而预测地下水位、了解地下水位变化情况对地基基础设计、保... 地基基础设计中,地下水是最活跃、复杂且难把握的因素。地下水受季节、环境影响较大,在建筑物的使用年限内地下水位是波动的,较大的地下水位变化可能引起地基失稳、基础破坏,从而预测地下水位、了解地下水位变化情况对地基基础设计、保障建筑物的使用安全是十分必要的。Visual MODFLOW是国际上较为成熟的地下水数值模拟软件,通过其建立数值模型,输入相关数据可对地下水位进行预测,为研究地下水位对地基基础的影响提供了重要的工具。 展开更多
关键词 地基基础 地下水 VISUAL MODFLOW 地下水位预测
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A Comparative Investigation of Groundwater Contamination in Typical Dumpsites and Cemetery Using Ert and Physicochemical Analysis of Water in Benin Metropolis, Nigeria 认领
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作者 Osabuohien Idehen 《地球科学和环境保护期刊(英文)》 2020年第1期72-85,共14页
This paper investigated the comparative analysis of groundwater contamination in Third Cemetery and Costain Dumpsite in Benin Metropolis, South South of Nigeria, using Electrical Resistivity Tomography (ERT) and Physi... This paper investigated the comparative analysis of groundwater contamination in Third Cemetery and Costain Dumpsite in Benin Metropolis, South South of Nigeria, using Electrical Resistivity Tomography (ERT) and Physicochemical analysis of water. The implications of land utilization for burial of dead human bodies in the form of cemeteries, many cases associated with coffin and caskets used for interment of remains and the location of refuse dump have received no consideration in Nigeria. Interment of bodies in cemeteries and dumping of refuse in dumpsites remain widespread practice and the only alternative endpoint to dead bodies and disposal of wastes in Nigeria. In Nigeria, this practice had not been perceived as having a significant potential contaminant effect in the environment and especially the groundwater component as search of literature attracted no such study to the country. In Benin City and Nigeria in general, the major cemeteries and dumpsites are located close to human residential areas and virtually all the populace within this locality depends on groundwater as the primary water source for various domestic purposes. Res2Dinv was employed in both sites as the geophysical method. The investigation of cemeteries is always difficult and challenging task in geoforensic prospective. Most researchers assess the impact of interment on the environment by comparing study results from cemeteries with data from reference sites. This study is based on this premise. The 2-D Geological Models showed that both Third Cemetery and Costain Dumpsite contained leachate plumes of various degrees as indicated by the low resistivity values, which infiltrated into the groundwater. The values of Water Quality Index (WQI) of groundwater samples in Third Cemetery and Costain Dumpsite were found to be 13.40 and 21.58 respectively which indicated that the quality of water at both Third Cemetery and Costain Dumpsite were good for drinking and other domestic purposes though with some degrees of contamination. 展开更多
关键词 Dumpsite CEMETERY Contamination 2-D GEOELECTRIC Model PHYSICOCHEMICAL Groundwater
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Piezometric Behavior in the Amazonian Lateritic Plateaus: Implications of Climate Changes to the Recharge of the Alter do Ch&atilde;o Aquifer System 认领
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作者 Júlio Henrichs de Azevedo José Eloi Guimar?es Campos André Walczuk Gomes 《水资源与保护(英文)》 2020年第2期102-119,共18页
Potentiometric and pluviometric datasets were evaluated to understand the behavior of aquifer recharge in the bauxite plateaus in the Porto Trombetas region, Pará, Northern Brazil. The datasets are originated fro... Potentiometric and pluviometric datasets were evaluated to understand the behavior of aquifer recharge in the bauxite plateaus in the Porto Trombetas region, Pará, Northern Brazil. The datasets are originated from three monitoring wells and an automatic climatological station. The local groundwater is related to the Alter do Chao Aquifer System, which despite being unconfined in valley regions, is semiconfined in the plateaus areas. The aquifer recharge occurs by direct infiltration and by leakage from the aquitard in the unconfined and semiconfined portions, respectively. Precipitation declined by 27% between 2002 and 2017. The rains accumulated between February and April are the most important for the recharge processes since this period is marked by higher absolute precipitation (up to 300 mm/month) and less deviation from the historical pattern. The recharge measured by the annual fluctuation of the water table also declined significantly in the 2010-2016 period. Statistical analysis demonstrates that in the case of a permanent climate change, expressed by rainfall reducing, the aquifer recharge would diminish at a non-linear rate, which is also expected for the base flow rates. In addition, data evaluation reveals that deforestation intensely decreases the recharge rates, as observed in the Aviso Plateau mining site. The results demonstrate that the water table fluctuations must be considered when modeling Global Climate Changes since the maintenance of surface flow rates (springs, lakes and streams) depends on aquifers baseflow. The result of the statistical analysis can be also applied to regions where climate patterns are strong seasonal, as the Savannah of Central Brazil. 展开更多
关键词 Groundwater ALTER DO Ch?o Aquifer System Amazon Region Climate Change
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Assessing Groundwater Contamination Risk and Detection of Unknown Sources Using a Multi-Component Reactive Transport Model 认领
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作者 Haniel Torres 《地球科学和环境保护期刊(英文)》 2020年第5期132-158,共27页
One of the most serious and important environmental issues related to the mining sector in Central Queensland is the contamination of abandoned mine sites. Representative of this issue is the abandoned Mount Morgan go... One of the most serious and important environmental issues related to the mining sector in Central Queensland is the contamination of abandoned mine sites. Representative of this issue is the abandoned Mount Morgan gold mine. The potential dispersal of acid mine drainage (AMD), a product of more than 100 million tons of sulphide-rich waste rock, into the surrounding environment, is the most challenging environmental problem currently facing this abandoned mine site. The abandoned Mount Morgan gold mine has multiple pollutant species that involve complex geochemical processes. The present study simulated the flow and transport processes founded on hydrological and geochemical conditions of the real-life field at the mine site. To assess the groundwater contamination risk and detect unknown pollution sources, few chemical species such as Iron and Sulphur were considered as the contaminants. The flow model was simulated using the computer code MODFLOW, and PHT3D was used for the simulation of advection, dispersion and chemical reactions of constituents dissolved in this groundwater system, and to mimic the reactive chemical transport processes in the polluted groundwater. To improve on results from other studies (Datta et al., 2017;Scotney, 2016;Doyle, 2016), a calibrated model was a main focus for this study. Field concentration measurements were matched with the flow simulation outcomes to calibrate the model. The results obtained showed a great potential to model transport of contaminants in the groundwater system using a real-world situation. 展开更多
关键词 GROUNDWATER CONTAMINATION Source Characterization PHT3D Chemically REACTIVE Transport Simulation Mine Site CONTAMINATION
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Evaluation of Temporal Changes in Deep Well Water Quality in Igabi Local Government Area of Kaduna State 认领
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作者 John Jiya Musa Otuaro Ebierni Akpoebidimiyen +2 位作者 Mohammed Tanimu Musa Pius Olusegun Olufemi Dada Elijah Tsado Musa 《环境保护(英文)》 2020年第1期22-33,共12页
The research work was carried out in Igabi Local Government of Kaduna State. Thirty water samples from boreholes were randomly collected within the major towns in November to April (Dry), and May to October (Rainy sea... The research work was carried out in Igabi Local Government of Kaduna State. Thirty water samples from boreholes were randomly collected within the major towns in November to April (Dry), and May to October (Rainy season). The samples were analyzed for physical, chemical, and bacteriological parameters and to observe any changes in the groundwater quality of the area. Analysis of variance (ANOVA), Pearson Correlation were performed on the data obtained using SPSS 10.0 for a window for significant variations and inter-element relationship. High mean turbidity was recorded in boreholes in Danfili (12.2 NTU), Kwarau (6.2 NTU). Mean turbidity of 4.3 NTU was recorded in Dry season for wells with Rigachikun having 5.1 NTU. It was observed that a negative correlation exists between well depth and heavy metal concentration. There was also a linear relationship of 0.686 between well distance and nitrate (faecal contaminant). Mean value for Fluoride (0.22 mg/l), Sodium (20.78 mg/l), Calcium (15.7 mg/l), Iron (0.013 mg/l), Nitrate (3.69 mg/l), Cadmium (0.00102 mg/l) Chloride (22.107 mg/l) recorded for sampled wells were all within WHO standard. A high value of 24 mg/l and 25 mg/l for Nitrate was recorded in Saminaka Road and Danfili. An indication of contamination during the rainy season indicates surface-groundwater intrusion (influx). The results of the bacteriological analysis indicated that most wells sampled have a range of 1 cfu/100 ml to 7 cfu/100 ml with Danfili Mani having the highest value (7 cfu/100 ml) which make it unsaved (not Potable). 展开更多
关键词 TEMPORAL CHANGE Analysis GROUNDWATER Physiochemical Bacteriological Quality
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典型草原露天煤矿区地下水-湖泊系统演化 认领 被引量:1
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作者 夏蔓宏 董少刚 +4 位作者 刘白薇 李铱 李政葵 王超 周雨泽 《湖泊科学》 EI CAS CSCD 北大核心 2020年第1期187-197,共11页
由于气候干旱、大量疏排地下水导致草原露天煤矿区普遍存在着水文循环失调、土壤沙化、草地退化等环境地质问题.本研究以呼伦贝尔草原伊敏露天煤矿为研究对象,在对矿区地下水湖泊系统调查分析的基础上,结合水文、气象及遥感影像等数据,... 由于气候干旱、大量疏排地下水导致草原露天煤矿区普遍存在着水文循环失调、土壤沙化、草地退化等环境地质问题.本研究以呼伦贝尔草原伊敏露天煤矿为研究对象,在对矿区地下水湖泊系统调查分析的基础上,结合水文、气象及遥感影像等数据,应用水均衡原理构建矿区地下水位湖泊面积响应机制的数学模型,并利用此模型预测分析矿区开发对伊敏盆地内湖泊面积的影响.结果表明:煤矿开采35年来,伊敏盆地湖群数量由开采前(1982年)的5个变为如今(2017年)的2个,湖泊总面积由原来的6.94 km^2萎缩到1.12 km^2;矿区地下水湖泊关系由自然状态下的地下水补给湖泊型向湖泊补给地下水型演化;本文建立的地下水湖泊耦合数学模型可较好地对湖泊面积进行预测,在气候因素波动不大、矿山开发稳定的状况下,该矿闭矿时(2045年)研究区湖泊面积将萎缩至0.56 km^2. 展开更多
关键词 露天煤矿 地下水 湖泊面积 地下水湖泊耦合模型
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C市地下水水质及污染来源分析 认领
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作者 刘姝媛 李云祯 +2 位作者 王涛 高程 于茵 《绿色科技》 2020年第16期9-11,共3页
结合C市不同区域的水质监测资料,运用多种统计方法,对该市的地下水主要水质指标进行了分析研究。结果表明:该市地下水水质指标除pH值以外,变异系数均较大,空间异质性明显。地下水中超标的水质指标有NH4+、Fe2+和Mn2+,超标率分别为5%、5%... 结合C市不同区域的水质监测资料,运用多种统计方法,对该市的地下水主要水质指标进行了分析研究。结果表明:该市地下水水质指标除pH值以外,变异系数均较大,空间异质性明显。地下水中超标的水质指标有NH4+、Fe2+和Mn2+,超标率分别为5%、5%和15%。该市的地下水水质是原生地质条件、工业生产、农业活动和日常生活等多种影响因素共同作用的结果。 展开更多
关键词 地下水 水质 污染来源
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基于同位素技术的且末车尔臣河流域地下水补给来源分析 认领
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作者 王旭东 李升 +1 位作者 郭新 王璐 《中国农村水利水电》 北大核心 2020年第2期23-28,33共7页
为了更加合理地利用及开发塔里木盆地南部且末县车尔臣河流域地下水资源,利用和田及乌鲁木齐2个监测站点多年大气降水同位素数据,拟合出当地大气降水线LMWL:δD=7.5δ18O+5.9(n=178,R2=0.9526)。通过不同地貌单元地表水与地下水同位素(... 为了更加合理地利用及开发塔里木盆地南部且末县车尔臣河流域地下水资源,利用和田及乌鲁木齐2个监测站点多年大气降水同位素数据,拟合出当地大气降水线LMWL:δD=7.5δ18O+5.9(n=178,R2=0.9526)。通过不同地貌单元地表水与地下水同位素(δD、δ18O、T)变化特征及Cl-δ18O相对变化规律,结合当地水文地质条件,探究了且末县车尔臣河流域地下水补给来源。研究表明:沿河流方向,研究区不同地貌单元地下水均受到冰川雪融水及高山降雨补给,补给源区为南部高山区。此外,灌区人为修建水渠、机民井等节水设施,地表水与浅层地下水发生混合,地下水还受到了河水、农田灌溉水渗漏补给;绿洲带承压水δD、δ18O、T值均偏低,反映地下水受到高海拔水源的早期补给且更新较慢;在沙漠一带地下水T值偏低,δD、δ18O值接近当地大气降水线,推测此段地下水还受到了局部大气降水补给。 展开更多
关键词 车尔臣河流域 地下水 同位素 地下水补给来源 干旱半干旱区
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