摘要
探讨径流曲线法(SCS—CN法)在不同土地利用方式中的适用性,为该方法评价水保措施提供一定参考。选择东北半干旱区径流小区监测资料,采用同时率定径流曲线数(CN)与初损率(λ)的方法,分析SCS—CN法在评价水保措施与耕作方式的可行性。结果表明:(1)干旱情况下(AMC1),最优λ值为0.05时,不同土地利用方式模拟不理想;利用改正潜在蓄水能力(S)方法得到的裸地、等高沟垄和顺坡垄作结果较为理想,对应CN1值分别为87.54,68.49和60.46,最优λ值为0.40。(2)水平槽、地埂植物带和水平梯田结果不理想,当实测径流量>10mm时,计算值过大,利用径流系数比改正后,模拟精度有较大提高,是适合水保措施的改正方法。(3)正常(AMC2)与湿润(AMC3)情况下数据量有限,保持最优λ值不变,改正S值,模拟效果较为理想,是适合干旱地区的估算方法。
The applicability of the Curve Number Method(SCS-CN)in different land use patterns was discussed to provide some references for the evaluation of water and soil conservation measures by this method.Based on the monitoring data of runoff plots in semi-arid areas of Northeast China,the feasibility of SCS-CN method in evaluating soil and water conservation measures and tillage methods was analyzed by the methods of simultaneously calibrating of runoff curve number(CN)and the initial loss ratio.The results showed that:(1)Under the drought(AMC1)condition,the optimal value ofλwas 0.05,but the simulation results of different land use patterns was not ideal,while the results of bare land,contour ridge and ridge along slope simulated by the modified method of the potential maximum retention(S)were better,and the corresponding CN 1 values were 87.54,68.49 and 60.46,respectively,and the optimal value ofλwas 0.40.(2)The results of horizontal troughs,vegetation belts and terraces were not ideal,and the calculated values were too large when the measured runoff was more than 10 mm.The simulation accuracy was greatly improved through correcting by runoff coefficient ratio,which was recommended as a suitable correction method for water conservation measures.(3)Under normal(AMC2)and wet(AMC3)conditions,the amount of data was limited,keeping the optimum value ofλremained,correcting S value,the simulation r esult was ideal,and it was a suitable estimation method for arid areas.
作者
许秀泉
范昊明
李刚
XU Xiuquan;FAN Haoming;LI Gang(College of Water Conservancy,Shenyang Agricultural University,Shenyang 100866;Water Conservancy Service Center of Fumeng County,Liaoning Province,Fuxin,Liaoning 123100)
出处
《水土保持学报》
CSCD
北大核心
2019年第4期52-57,共6页
Journal of Soil and Water Conservation
基金
国家重点研发计划项目(2016YFE0202900)
国家自然科学基金项目(41807062)
关键词
水土保持措施
初损率
CN值
改正
soil and water conservation measures
initial loss ratio
curve number values
correction
