Coupling the Xinanjiang model to a kinematic flow model based on digital drainage networks for flood forecasting |
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| Authors: | Jintao Liu Xi Chen Jiabao Zhang Markus Flury |
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| Institution: | 1. State Key Laboratory of Hydrology‐Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, People's Republic of China;2. State Experimental Station of Agro‐Ecosystem in Fengqiu, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China;3. Department of Crop and Soil Science, Center for Multiphase Environmental Research, Washington State University, Pullman, WA 99164‐6420, USA |
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| Abstract: | The Xinanjiang model, which is a conceptual rainfall‐runoff model and has been successfully and widely applied in humid and semi‐humid regions in China, is coupled by the physically based kinematic wave method based on a digital drainage network. The kinematic wave Xinanjiang model (KWXAJ) uses topography and land use data to simulate runoff and overland flow routing. For the modelling, the catchment is subdivided into numerous hillslopes and consists of a raster grid of flow vectors that define the water flow directions. The Xinanjiang model simulates the runoff yield in each grid cell, and the kinematic wave approach is then applied to a ranked raster network. The grid‐based rainfall‐runoff model was applied to simulate basin‐scale water discharge from an 805‐km2 catchment of the Huaihe River, China. Rainfall and discharge records were available for the years 1984, 1985, 1987, 1998 and 1999. Eight flood events were used to calibrate the model's parameters and three other flood events were used to validate the grid‐based rainfall‐runoff model. A Manning's roughness via a linear flood depth relationship was suggested in this paper for improving flood forecasting. The calibration and validation results show that this model works well. A sensitivity analysis was further performed to evaluate the variation of topography (hillslopes) and land use parameters on catchment discharge. Copyright © 2009 John Wiley & Sons, Ltd. |
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| Keywords: | kinematic wave method runoff infiltration drainage network digital elevation model land use Xinanjiang model |
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