INFLUENCE OF RADAR RAINFALL HORIZONTAL RESOLUTION ON HYDROLOGICAL SIMULATION-A CASE STUDY OF XITIAOXI WATERSHED
GAO Yu-fang
CHEN Yao-deng
PENG Tao
Abstract：Weather radar rainfall is one of the important information for runoff simulation and flood forecasting. Because each grid point rainfall value is susceptible to error, and radar rainfall error decreases as the temporal and spatial scales increase, high resolution does not necessarily equate to higher accuracy in applications such as hydrological simulation. In this paper, the Fractions Skill Score (FSS) and HEC-HMS (Hydrologic Engineering Center's Hydrologic Modeling System) are used to analyze the influence of radar rainfall horizontal resolution on hydrological simulation. In the two summer events from 2010 to 2011 in the Xitiaoxi River basin, FSS can achieve the target precision value at minimum effective horizontal scale of approximately 2—8 km with different radar rainfall threshold. Radar rainfall at the horizontal resolution of 2, 4, 6 and 8km is used as input data in the HEC-HMS model. Analysis of the simulation results reveals that the results of runoff simulation based on different horizontal resolution radar rainfall are basically consistent with the measured runoff data, and the influence of radar rainfall horizontal resolution at 2, 4, 6 and 8 km on hydrological simulation is not obvious.
Keywords：applied meteorologyradar rainfallFSS methodrunoffhorizontal resolution
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 347-352 )