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1、第27卷第2期水土保持通报Vol.27,No.22007年4月BulletinofSoilandWaterConservationApr.,2007WEPP模型坡面版在黄土丘陵沟壑区的适用性评价以坡长因子为例1,21,223王建勋,郑粉莉,江忠善,张勋昌(1.西北农林科技大学资源环境学院,陕西杨凌712100;2.中科院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100;3.美国农业部农业研究局草场实验室,俄克拉荷马州埃尔里诺73036)摘要:利用安塞试验站19851992年的气象观测数据和野外坡长径流小区径流量和土
2、壤侵蚀量监测资料,评价了WEPP模型在黄土丘陵沟壑区不同坡长条件下的适用性。结果表明,在10,20,30和40m这4个坡长条件下,WEPP模型对次降雨、年平均和多年平均径流量的模拟结果略差;而WEPP模型对次降雨和年平均土壤侵蚀量模拟结果较好,无论是模拟值在不同坡长之间的差值,还是模拟值随坡长变化趋势均与实测值接近。WEPP模型对次降雨和年平均径流量模拟的NashSutcliffe有效性ME分别为0.915和0.879;对次降雨和年平均土壤侵蚀量模拟的NashSutcliffe有效性ME分别为0.853和0.758。WEPP对多年平均径流量和侵蚀量的模拟效
3、果可满足要求。I30对WEPP模型模拟次降雨径流量有重要影响,当I30大于0.92mm/min,模型模拟误差较大。WEPP模型对次降雨土壤侵蚀量的模拟与PI30密切相关,当2PI30大于129mm/min时,模型模拟误差较大。PI30对WEPP模型模拟年平均径流量和侵蚀量有重要2影响,当PI30大于150mm/min时,模拟精度明显下降,且PI30对径流模拟的影响明显大于对土壤侵蚀模拟的影响。关键词:WEPP;土壤侵蚀;坡长;适用性;黄土高原文献标识码:A文章编号:1000288X(2007)02005006中图分类号:S157Assessm
4、entofWEPPModelApplicability(HillslopeVersion)onHillgullyRegionoftheLoessPlateauACaseStudyinSlopeLengthFactor1,21,223WANGJianxun,ZHENGFenli,JIANGZhongshan,ZHANGXunchang(1.CollegeofResourceandEnvironment,NorthwestAgricultureandForestryUniversity,Yangling,Shaanxi712100,China;2.
5、TheStateKeyLaboratoryofSoilErosionandDrylandFarmingonLoessPlateau,InstituteofSoilandWaterConservation,ChineseAcademyofSciencesandMinistryofWaterResources,Yangling,Shaanxi712100,China;3.USDAARSGrazinglandsResearchLaboratory,EIReno,Oklahoma73036,U.S.)Abstract:Basedonobservedmeteorolo
6、gicaldataandmeasuredsoillossdatafromfieldrunoffplotsin19851992atAnsaiComprehensiveExperimentalStation,theapplicabilityofWEPPmodeltodifferentslopelengthsonhillgullyregionoftheLoessPlateauwasassessed.Resultsshowedthatsimulatedvaluesofeventrunoff,annualrunoff,andaverageannualrunoffby
7、WEPPmodelwerenotdesirablefortheslopelengthsof10m,20m,30mand40m.However,thesimulatedvaluesofeventsoillossandannualsoillossbyWEPPmodelweredesirablefortheslopelengthsof10m,20m,30mand40m,respectively.Thedifferencesofsimulatedvaluesbetweenslopelengthsandincreasingtrendwithincreaseofslope
8、lengthwereclosetoob
