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《Yangtze River》 2018-12
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Impact of river channel characteristic data on flood forecast of small and medium sized watershed based on Liuxihe Model

QIN Jiangming;CHEN Yangbo;LI Mingliang;WANG Huanyu;School of Geography and Planning,Sun Yat-sen University;Bureau of Hydrology and Water Resources of Ganzhou City;  
In this paper,a flood forecast model of small and medium sized watershed based on Liuxihe Model is established for the Qinjiang River Basin and the impacts of the river channel characteristic data including the cross-section shape,cross-section size and channel levels on the flood forecast accuracy are quantitatively evaluated. The results show that the more the river channel level is,the higher the simulated flood peak flow is,the larger the runoff coefficient is,the earlier the peak flow occurs,and the better simulated result it gets. When constructing the Liuxihe model,assuming the river channel cross-section shape as rectangular and estimating the cross-section size with satellite remote sensing image are feasible and the simulated accuracy of flood process meets the required real-time flood forecast accuracy. Generalizing the basin river system as 3 levels is proposed,which would have a better performance in small and medium sized watershed flood simulation with the revised Liuxihe model.
【Fund】: 国家自然科学基金项目(51479033);; 江西水利科技项目(KT201407);; “十二五”国家科技支撑计划项目(2012BAK10B06-04);; 广东省科技计划项目(2013B020200007)
【CateGory Index】: TV122
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