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Hydrological impact of a reservoir network in the upper Gan River Basin, China

机译：赣江上游流域水库网络的水文影响

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摘要

A few relatively large reservoirs, hundreds of small reservoirs, and numerous farm dams were built in the upper Gan River Basin, China. The operation of such a reservoir network can serve as a significant source of variability in the local hydrological regime and should be included in research to better understand the interaction between multiple hydrological processes and watershed management. In this study, a reservoir network module that included reservoirs of multiple sizes was developed and fully integrated into the coupled land surface and distributed hydrologic model system (CLHMS), for a detailed description of the hydrological impact of a reservoir network. A generalized release scheme was employed to determine the outflow of both large and small reservoirs. The integrated model was then evaluated against observations and reanalysis data, which indicate that the model can reasonably reconstruct the reservoir operation, streamflow, and other hydrological variables. Results quantitatively demonstrate that a reservoir network can result in an increased streamflow in dry seasons, a decreased streamflow in wet seasons, a generally larger groundwater discharge, higher groundwater level, a slightly damper soil condition, and a larger amount of evapotranspiration at the basin level. With the integrated model, it is feasible to achieve more sustainable watershed planning and management.
机译：在中国赣江上游地区建造了一些相对较大的水库，数百个小型水库和许多农场水坝。这种水库网络的运行可以作为当地水文情势变化的重要来源，应该纳入研究以更好地理解多种水文过程与流域管理之间的相互作用。在这项研究中，开发了包括多种大小水库的水库网络模块，并将其完全集成到耦合的陆面和分布式水文模型系统（CLHMS）中，以详细描述水库网络的水文影响。采用通用释放方案来确定大型和小型水库的流出量。然后，根据观测值和再分析数据对集成模型进行了评估，这表明该模型可以合理地重构水库运行，水流和其他水文变量。结果定量地表明，一个水库网络可导致干旱季节的水流量增加，潮湿季节的水流量减少，地下水流量通常更大，地下水位更高，土壤状况略微潮湿以及盆地水平上的较大蒸散量。 。使用集成模型，可以实现更可持续的流域规划和管理。

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