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《Journal of Hainan Normal University(Natural Science)》 2018-01
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An Improved Method of Calculating Roughness Coefficient for FloodArea

LUO Zunhua;LIN Guangfa;ZHANG Rongyan;ZHANG Wenfu;Institute of Geography,Fujian Normal University;Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters;Research Center for National Geographical Condition Monitoring and Emergency Support in the Economic Zone on the West Side of the Taiwan Strait;Fujian Climate Center;Xiamen Great Power Geo Corporation,State Grid Information and Telecommunication Group;  
The space roughness coefficient is an important parameter in FloodArea,which is a two-dimensional GIS hydrodynamic evolution model. The coefficient has a significant influence on the flow velocity in the simulation process. The algorithm of FloodArea and definition of roughness coefficient in the model,both regarding grids as the slope,do not distinguish the river area and the slope area. Besides,rules of overland flow and channel flow are both defined by Manning formula. In addition,based on land cover type,roughness coefficient is usually staticly set. However,in the simulation,the process of confluence or flood often leads to lower roughness of the underlying surface,which makes the roughness of thesimulation higher than the reality,and causes the lower flow rate in result. Aiming at the problems mentioned above,the method of setting up the roughness by differential treatment of the river area and the slope area is put forward based on the type of land cover and DEM. Taking the river between Xianyou hydrologic station and Lanxi hydrologic stations as study area,which is in the middle and lower reaches of Mulanxi river in Fujian province,this paper used the improved roughness coefficient and completed the flood simulation experiment by FloodArea based on the actually measured data. The results show that the calibration process is simplified and the accuracy of the simulation is improved. In addition,the method does not require additional data and is comparatively suitable to the flood hydrological process simulation and flood disaster warning in the area with lack of data.
【Fund】: 国家重点研发计划重点专项(2016YFC0502905);; 福建省公益类科研院所专项(2015R1034-1);; 福建省测绘地理信息局科技基金(2017JX03)
【CateGory Index】: P208;P336
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