Improved flood forecasting using geomorphic unit hydrograph based on spatially distributed velocity field

Wen-chuan Wang; Yan-wei Zhao; Kwok-wing ChauDong-mei XuChang-jun Liu

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Improved flood forecasting using geomorphic unit hydrograph based on spatially distributed velocity field

机译：Improved flood forecasting using geomorphic unit hydrograph based on spatially distributed velocity field

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摘要

This paper presents an energy model for determining the overland flow velocity in order to improvethe low accuracy problem in flow concentration simulation. It furnishes a novel idea for studying flowconcentration in ungauged basins. The model can be widely applied in analysis of spatial velocityfield, extraction of instantaneous geomorphic unit hydrograph and development of distributedhydrological model. A distributed flood-forecasting model is constructed for Lianyuan Basin in HunanProvince of China. In the proposed method, gravitational potential energy is transformed into kineticenergy via an analysis of energy distribution of water particles in the basin. Based on the kineticenergy equation, the overland flow velocity simulating the geomorphic unit hydrograph is computed.Rainfall-runoff simulation is then performed by integrating with runoff yield and concentration model.Results indicate that the model based on energy conversion leads to more accurate results. Themodel has the following advantages: firstly, the spatial distribution of the velocity field is appropriate;secondly, the model has only one parameter, which is easily determined; and finally, flow velocityresults can be used for the computation of river network flow concentration.

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来源
《Journal of hydroinformatics》 |2021年第4期|724-739|共16页
作者
Wen-chuan Wang; Yan-wei Zhao; Kwok-wing ChauDong-mei XuChang-jun Liu;
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作者单位

College of Water Resources, Henan Key Laboratoryof Water Resources Conservation and IntensiveUtilization in the Yellow River Basin,North China University of Water Resources andElectric Power,Zhengzhou 450046,China;

Department of Civil and EnvironmentalEngineering,The Hong Kong Polytechnic University,Hung Hom, Kowloon, Hong Kong,China;

China Institute of Water Resources andHydropower Research,Beijing 100038,China;

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收录信息美国《科学引文索引》(SCI);
原文格式 PDF
正文语种英语
中图分类水文科学（水界物理学）;
关键词
distributed hydrological model; flood forecasting; geomorphic unit hydrograph; hydrodynamic energy; spatially distributed velocity field;

Improved flood forecasting using geomorphic unit hydrograph based on spatially distributed velocity field

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