GroMoPo Metadata for Zhangye Basin SWMM-GSFLOW model

In semi-arid and arid areas with intensive agriculture, surface water-groundwater (SW-GW) interaction and agricultural water use are two critical and closely interrelated hydrological processes. However, the impact of agricultural water use on the hydrologic cycle has been rarely explored by integrated SW-GW modeling, especially in large basins. This study coupled the Storm Water Management Model (SWMM), which is able to simulate highly engineered flow systems, with the Coupled Ground-Water and Surface-Water Flow Model (GSFLOW). The new model was applied to study the hydrologic cycle of the Zhangye Basin, northwest China, a typical arid to semi-arid area with significant irrigation. After the successful calibration, the model produced a holistic view of the hydrological cycle impact by the agricultural water use, and generated insights into the spatial and temporal patterns of the SW-GW interaction in the study area. Different water resources management scenarios were also evaluated via the modeling. The results showed that if the irrigation demand continuous to increase, the current management strategy would lead to acceleration of the groundwater depletion, and therefore introduce ecological problems to this basin. Overall, this study demonstrated the applicability of the new model and its value to the water resources management in arid and semi-arid areas. (C) 2014 Elsevier Ltd. All rights reserved.

在农业集约化的半干旱与干旱地区，地表水-地下水（Surface Water-Groundwater, SW-GW）交互作用与农业用水是两类关键且紧密关联的水文过程。然而，采用集成SW-GW模型探究农业用水对水文循环影响的研究尚少，在大型流域中尤为匮乏。本研究将可模拟高度人工化径流系统的暴雨管理模型（Storm Water Management Model, SWMM）与地下水-地表水耦合流模型（Coupled Ground-Water and Surface-Water Flow Model, GSFLOW）进行耦合，并将该新型模型应用于中国西北张掖盆地的水文循环研究——该区域是兼具典型干旱-半干旱特征且灌溉规模显著的流域。经成功率定后，该模型全面揭示了农业用水对水文循环的影响机制，并为研究区SW-GW交互作用的时空分布特征提供了科学认知。研究还通过模型模拟评估了多套水资源管理方案，结果表明：若灌溉需水量持续增长，现行管理策略将加剧地下水超采态势，进而给该流域带来一系列生态问题。总体而言，本研究验证了该新型耦合模型的适用性，及其在干旱半干旱地区水资源管理中的应用价值。©2014 Elsevier有限公司 保留所有权利。