摘要
运用经验公式法、双累积曲线法和不同系列对比法计算出岔巴沟、大理河与无定河流域在20世纪70年代水土保持综合措施的平均减水效益分别为14.47%、20.22%和20.78%,平均减沙效益为64.97%、43.62%和47.26%。对计算结果进行分析发现,用3种方法对岔巴沟、大理河与无定河流域水土保持综合措施减水减沙效益的计算结果之间的关系没有尺度效应。引进"减水效率"和"减沙效率"的概念来表示水土保持措施减水减沙作用的能力,然后通过对3个流域水土保持综合措施减水效率和减沙效率的分析发现:①无论是小流域还是中、大流域,水土保持综合措施减沙效率都大于减水效率,小流域的减沙减水效率比大于中、大流域的减沙减水效率比,尺度效应明显,后两者减沙减水效率比都各自趋于一致,尺度效应不明显;②小流域水土保持综合措施减水效率要低于中、大流域的减水效率,而小流域水土保持综合措施减沙效率远高于中、大流域的减沙效率,尺度效应明显,中、大流域减水减沙效率都各自趋于一致,尺度效应亦不明显。
The study of runoff and sediment reduction benefits of soil and water conservation measures has been improved at different scales separately;however,there are relatively few studies on the scale effect of runoff and sediment reduction benefits of soil and water conservation measures in basins of different scales.In this study for Chabagou,Dalihe and Wudinghe basins,runoff and sediment reduction benefits of soil and water conservation measures in the 1970s are calculated by three methods： rainfall-runoff and rainfall-sediment statistical model（R-RSM）,double accumulative curve method（DACM） and time series contrasting method（TSCM） accordingly.As a result,average runoff reduction benefits are 14.47%,20.22% and 20.78% respectively and average sediment reduction benefits are 64.97%,43.62% and 47.26% respectively.The results show that there is no scale effect in the results from the three methods when they are applied separately to calculate runoff and sediment reduction benefits in basins of three scales.Runoff reduction efficiency（RRE） and sediment reduction efficiency（SRE） indicating the ＂efficiency＂ of the runoff and sediment reduction benefits are introduced,and after analyzing the relationship between runoff reduction efficiency and sediment reduction efficiency of basins of three scales,several conclusions are obtained.（1） Sediment reduction efficiency is always greater than runoff reduction efficiency in basins of three scales,however,the ratio of sediment reduction efficiency to runoff reduction efficiency of small scale basin is greater than that of middle and large scale basins and there is no scale effect of the ratio between middle and large scale basins.（2） Sediment reduction efficiency of small scale basin is lower than that of middle and large scale basins,while runoff reduction efficiency of small scale basin is greater,and runoff reduction efficiency and sediment reduction efficiency of middle and large scale basins are so close that there is no scale effect.
出处
《地理科学进展》
CSCD
北大核心
2011年第1期95-102,共8页
Progress in Geography
基金
国家重点基础研究发展计划(973)项目(2007CB407207)
国家基金委员会重点基金项目(40635027)
关键词
水文法
减水效益
减沙效益
减水效率
减沙效率
水土保持措施
rainfall-runoff and rainfall-sediment statistical model
runoff reduction benefits
sediment reduction benefits
soil and water conservation measures
runoff reduction efficiency
sediment reduction efficiency
