Booming urbanization due to a fast-growing population results in more impervious areas, less infiltration,and hence greater flood peak and runoff. Clear understanding of flood responses in regions with different level...Booming urbanization due to a fast-growing population results in more impervious areas, less infiltration,and hence greater flood peak and runoff. Clear understanding of flood responses in regions with different levels and expansions of urbanization is of great importance for regional urban planning. In this study, comparison of flooding responses to urbanization processes in terms of flood peak and runoff volume in the upper, middle,and lower Xiang River Basin(XRB), China, was carried out using the Hydrologic Engineering Center-Hydrologic Modeling System(HEC-HMS) model. From 2005 to 2015, urbanization level and intensity were higher in the lower XRB compared to the upper and middle XRB, and the overall expansion rate of urban areas was 112.8%.Modeling results by the HEC-HMS model indicate elevated flood peak discharges and volumes due to fast urbanization in the XRB from the 1980 s to 2015. This rapid increase is particularly the case in the lower XRB. The study also revealed different hydrological responses of flood regimes—urbanization tends to have larger impacts on peak flood flow rather than on flood volume in the lowerXRB, which further corroborated urbanization-induced intensifying flood processes in terms of peak flood flow.Urbanization has increasing impacts on flood volume from the upper to the lower XRB, which can be attributed to accumulated runoff down the river system. This study provides a reference for basin-wide land use and urban planning as well as flood hazard mitigation.展开更多
蒸散发作为水文循环中的重要变量,也可以成为水文模型参数率定中替代实测径流的重要变量。研究基于SWAT模型,以湘江流域中上游为例,通过对比基于实测径流和基于蒸散发两种率定方案所得到的模拟日径流,探究了MODIS(Moderate Resolution I...蒸散发作为水文循环中的重要变量,也可以成为水文模型参数率定中替代实测径流的重要变量。研究基于SWAT模型,以湘江流域中上游为例,通过对比基于实测径流和基于蒸散发两种率定方案所得到的模拟日径流,探究了MODIS(Moderate Resolution Imaging Spectroradiometer)中分辨率成像光谱仪蒸散发产品(MOD16A2)、GLEAM(Global Land Evaporation Amsterdam Model)和GLDAS(Global Land Assimilation Data System)蒸散发产品在模型参数率定中的适用性及其对径流模拟的影响,并分别对比湘江中游和上游两个水文站的模拟效果以分析不同流域所造成的差异。研究结果表明基于GLEAM、GLDAS和MOD16的参数率定能够获得比较好的径流模拟效果,尤其是在流域中游的衡阳站。在率定期,其在双牌站的NSE均能达到0.50以上,在衡阳站的NSE均能达到0.70以上,与基于实测径流率定的日径流模拟效果相当。在验证期,其在双牌站得到的径流NSE皆高于0.58,与基于实测径流率定所得到的NSE(0.60)相当;而在衡阳站,基于蒸散发参数率定所得到的径流模拟效果略好于基于实际径流的,其中基于GLDAS和MOD16的径流模拟NSE可达到0.72,明显高于基于实际径流率定得到的NSE(0.60)。研究验证了遥感蒸散发数据在水文模型参数率定中具有的巨大潜力,且在面积更大的流域可能具有更好的适用性。研究可推广应用至其流域,可为解决无资料地区的水文模拟提供思路。展开更多
基金supported by the Open Fund of State Key Laboratory of Remote Sensing Science(Grant No.OFSLRSS201720)the National Natural Science Foundation of China(Grant No.41401097+1 种基金 41771536)National Key Research and Development Program Project:Development of the Platform for Dynamic Early Warning and Risk Assessment of Mountain Torrents Disaster(2017YFC1502505)
文摘Booming urbanization due to a fast-growing population results in more impervious areas, less infiltration,and hence greater flood peak and runoff. Clear understanding of flood responses in regions with different levels and expansions of urbanization is of great importance for regional urban planning. In this study, comparison of flooding responses to urbanization processes in terms of flood peak and runoff volume in the upper, middle,and lower Xiang River Basin(XRB), China, was carried out using the Hydrologic Engineering Center-Hydrologic Modeling System(HEC-HMS) model. From 2005 to 2015, urbanization level and intensity were higher in the lower XRB compared to the upper and middle XRB, and the overall expansion rate of urban areas was 112.8%.Modeling results by the HEC-HMS model indicate elevated flood peak discharges and volumes due to fast urbanization in the XRB from the 1980 s to 2015. This rapid increase is particularly the case in the lower XRB. The study also revealed different hydrological responses of flood regimes—urbanization tends to have larger impacts on peak flood flow rather than on flood volume in the lowerXRB, which further corroborated urbanization-induced intensifying flood processes in terms of peak flood flow.Urbanization has increasing impacts on flood volume from the upper to the lower XRB, which can be attributed to accumulated runoff down the river system. This study provides a reference for basin-wide land use and urban planning as well as flood hazard mitigation.
文摘蒸散发作为水文循环中的重要变量,也可以成为水文模型参数率定中替代实测径流的重要变量。研究基于SWAT模型,以湘江流域中上游为例,通过对比基于实测径流和基于蒸散发两种率定方案所得到的模拟日径流,探究了MODIS(Moderate Resolution Imaging Spectroradiometer)中分辨率成像光谱仪蒸散发产品(MOD16A2)、GLEAM(Global Land Evaporation Amsterdam Model)和GLDAS(Global Land Assimilation Data System)蒸散发产品在模型参数率定中的适用性及其对径流模拟的影响,并分别对比湘江中游和上游两个水文站的模拟效果以分析不同流域所造成的差异。研究结果表明基于GLEAM、GLDAS和MOD16的参数率定能够获得比较好的径流模拟效果,尤其是在流域中游的衡阳站。在率定期,其在双牌站的NSE均能达到0.50以上,在衡阳站的NSE均能达到0.70以上,与基于实测径流率定的日径流模拟效果相当。在验证期,其在双牌站得到的径流NSE皆高于0.58,与基于实测径流率定所得到的NSE(0.60)相当;而在衡阳站,基于蒸散发参数率定所得到的径流模拟效果略好于基于实际径流的,其中基于GLDAS和MOD16的径流模拟NSE可达到0.72,明显高于基于实际径流率定得到的NSE(0.60)。研究验证了遥感蒸散发数据在水文模型参数率定中具有的巨大潜力,且在面积更大的流域可能具有更好的适用性。研究可推广应用至其流域,可为解决无资料地区的水文模拟提供思路。
