Effect of land use change on storm runoff simulation using a simple distributed hydrological model
Land-use change is the most remarkable symbol of the earth landscape evolution,also one of the main factors which accelerate regional and even global change.The impact of land-use change on storm runoff is a hot topic in hydrologic research and is often assessed by hydrological model through designed land-use scenarios.In this study,a simple distributed hydrological model is introduced and improved to make model scheme more close to the practical processes and integrate with more remote sensing data.The improved model is tested with six representative and isolated storm events and gained a good performance.All the relative errors of storm runoff depth are less than 18％ and the peak discharge errors are within 20％.Although the flood peak of all storm take place one or two hours in advance,but the Nash efficiency are approving,not less than 81％.The investigation of land-use change effect through 4 designed landuse scenarios reveal that land cover with forest corresponds to large interception and woody savanna corresponds to small interception.The croplands have almost the same interception as in actual land-use.Runoff depth decreases in forest land and increases in woody savannas and croplands.Peak discharges have the same variation as runoff depth.Croplands make peak discharge increase more than 20％,at the same time,return period of flood become shorten.However,the time to flood peak are changeless in every land-use scenarios due to the small study area probably.
Land-use change Storm runoff Distributed hydrological model LAI Land-use scenarios
Xianghu Li Liliang Ren Bang Yang
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing,Jiangsu Province,China,210098
国际会议
第16届国际地理信息科学与技术大会(16th International Conference on GeoInformatics and the Joint Conference)
广州
英文
2008-06-28（万方平台首次上网日期，不代表论文的发表时间）