期刊
HYDROGEOLOGY JOURNAL
卷 30, 期 6, 页码 1899-1910出版社
SPRINGER
DOI: 10.1007/s10040-022-02527-z
关键词
Groundwater development; Transboundary aquifer; Water resources management; India; Nepal
资金
- World Bank
This study presents a model-based analysis of the impacts of groundwater withdrawal on dry-period streamflow in the Kosi Fan region of India and Nepal. The simulations show that the current groundwater withdrawal has minimal effect on the dry-season flow of the rivers. Under a high-reduction scenario, the groundwater withdrawal only has a slight reduction in the dry-season baseflow, which is mitigated by the pumping-induced increase in rainfall recharge.
The Kosi Fan region of India and Nepal hosts a productive aquifer system. Regional hydrology is highly seasonal, and both groundwater and surface water are used for irrigation. Groundwater depletion is not currently occurring, but there is concern that plans to increase groundwater irrigation will reduce river baseflow, potentially affecting downstream water users. This study presents a model-based analysis of the impacts of groundwater withdrawal on dry-period streamflow and evaluation of management alternatives. A sensitivity analysis was performed in which a range of model parameters were tested around a best-estimate, base-case scenario. A high-reduction scenario was then developed which combined the factors that produced the greatest pumping-induced reduction in dry-season baseflow. Management strategies for 2.5, 5, and 10-km no-pumping buffers around the rivers were tested for the base-case and high-reduction scenarios. Simulations show that groundwater withdrawal equivalent to 30% and 60% of dry-season streamflow for the Kosi and Mahananda rivers, respectively, reduces the current dry-season flow by less than 4%. In the base-case scenario, simulated dry-season baseflow reduction is 1.8% and 2.6% for the rivers, respectively; these reduce to similar to 1% with a 2.5-km buffer zone. For the high-reduction scenario, dry-season baseflow reductions are 4.7% and 7.0% with no buffer; these reduce to 1.3% and 0.9% with a 5-km buffer for the Kosi and Mahananda rivers, respectively. The small reductions in baseflow relative to the total amount of pumping are due to a pumping-induced increase in rainfall recharge, thus the effects of additional pumping are mitigated.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据