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首页> 外文期刊>Environmental earth sciences >Exploring hydrogeology and groundwater dynamics in a lateritic terrain of West Bengal, India, under limited data conditions
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Exploring hydrogeology and groundwater dynamics in a lateritic terrain of West Bengal, India, under limited data conditions

机译：在有限的数据条件下探索印度西孟加拉邦红土地形中的水文地质和地下水动力学

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摘要

This study aimed at investigating hydrogeology and groundwater dynamics in a lateritic terrain of West Bengal, India, under limited data conditions. A field setup was developed comprising six observation wells, two on-farm reservoirs and three artificial excavations. Ground water levels, groundwater quality and water levels of surface water bodies were monitored during 2003-2005 period. Regression and correlation analyses of groundwater levels with rainfall and surface water levels were performed to study rainfall-ground water dynamics and surface water-ground water interaction. Depth-wise geologic samples of six sites were subjected to grain-size analysis (GSA) and stratigraphy analysis. Hydraulic conductivities (K) of subsurface formations at different depths were estimated by three GSA models, and finally groundwater recharge was estimated. Stratigraphy analyses revealed that besides shallow aquifers, deep confined aquifers of 5-16 m thickness exist at 54-96 m depths in the study area. Significant correlation of groundwater levels with the water levels in excavations and the 'potential recharge' of 1.90-2.99 cm/day from excavations indicate that the excavations can serve as promising low-cost recharge structures for augmenting groundwater resources. Nitrate concentration in the groundwater beyond maximum permissible limit at most sites renders it unsuitable for drinking purpose. Furthermore, the Hazen, Harleman, and Alyamani and Sen models yielded reasonable K values of subsurface formations. Average hydraulic conductivity and transmissivity values of the deep aquifer system vary from 3 to 129 and 27 to 1161 m(2)/day, respectively, which suggest significant aquifer heterogeneity. Seasonal groundwater recharge in the study area was found to be in the range of 4.32-15.24 cm.
机译：这项研究旨在在有限的数据条件下调查印度西孟加拉邦红土地形中的水文地质和地下水动力学。开发了一个野外设置，包括六个观察井，两个农场水库和三个人工开挖。在2003-2005年期间监测了地下水位，地下水水质和地表水体的水位。进行了地下水位与降雨和地表水位的回归分析和相关性分析，以研究降雨-地下水动力学和地表水-地下水相互作用。对六个地点的深度地质样品进行了粒度分析（GSA）和地层分析。通过三种GSA模型估算了不同深度地下地层的水导率（K），最后估算了地下水补给量。地层学分析表明，研究区除浅层含水层外，在54-96 m深度处还存在厚度为5-16 m的深层承压含水层。地下水位与开挖中的水位之间的显着相关性以及开挖产生的1.90-2.99 cm /天的“潜在补给量”表明，该开挖可作为有前途的低成本补给结构，以增加地下水资源。在大多数地方，地下水中的硝酸盐浓度超过最大允许限值，使其不适合饮用。此外，Hazen，Harleman，Alyamani和Sen模型产生了合理的地下地层K值。深层含水层系统的平均水力传导率和透射率值分别从3到129和27到1161 m（2）/天不等，这表明明显的含水层非均质性。研究区域的季节性地下水补给量在4.32-15.24厘米之间。

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