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首页> 外文期刊>Asian Journal of Agricultural Extension, Economics & Sociology >Evaluation of Ground Water Resources in Mymensingh Sadar Upazilla, Bangladesh
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Evaluation of Ground Water Resources in Mymensingh Sadar Upazilla, Bangladesh

机译：孟加拉国Mymensingh Sadar Upazila地下水资源评估

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A study was conducted to make an overall assessment of aquifer, groundwater resources, and its optimum utilization as well as the potentiality of groundwater abstraction in Mymensingh sadar upazilla. The subsurface lithology was investigated from the collected data of twelve borelogs in the study area. The subsurface formation of the study area was stratified with clay, sandy clay and fine sand at the upper part while medium sand, coarse sand at the lower part of subsurface lithology. The thickness of clay and silty or sandy clay layers ranging from 6 m to 58 m having an average thickness of 33.8 m existed below the ground surface. The thickness of composite aquifer varied from 13 m to 75 m having average thickness of 27.6 m. Main aquifer or exploitable aquifer thickness varied from 23 m to 61 m having average thickness of 43.8 m. Transmissibility of the aquifer found by applying Jacob’s time-drawdown method was 1037 m2/day to 4430 m2/ day and the average is 3154 m2/day. The static water level started rising from the month of April and continued to rise up to the month of September or October The water level started to deplete from September to October and continued up to April. Average specific draw-down was 114.8 m/cumec and average specific capacity was 4.7x10-4 cumec/m obtained by multi-step pumping test method. The recharge and depletion characteristics were found to be almost in equilibrium condition. The long-term trend of ground water level was found to be in declining position in the recent years.
机译：进行了一项研究，以对Mymensingh sadar upazilla中的含水层，地下水资源及其最佳利用以及提取地下水的潜力进行总体评估。地下岩性是从研究区域的十二个井筒的采集数据中调查的。研究区的地下地层上部为粘土，砂质粘土和细砂分层，地下岩性下部为中砂，粗砂。地表以下存在厚度为6 m至58 m的粘土和粉质或沙质粘土层，平均厚度为33.8 m。复合含水层的厚度从13 m到75 m不等，平均厚度为27.6 m。主含水层或可利用含水层的厚度在23 m至61 m之间变化，平均厚度为43.8 m。应用雅各布（Jacob）的跌落法测得的含水层的透过率为1037 m 2 /天至4430 m 2 /天，平均为3154 m 2 /天。静态水位从4月开始上升，并一直上升到9月或10月。从9月到10月，水位开始下降，一直持续到4月。通过多步泵送试验法获得的平均比重为114.8 m / cumec，平均比容为4.7x10 -4 cumec / m。发现充电和耗尽特性几乎处于平衡状态。近年来，地下水位的长期趋势被发现在下降。

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