摘要
在对黄土高原吕二沟流域1982—2005年侵蚀产沙资料统计计算的基础上,从流域尺度上,以次降雨径流产沙为主要研究对象,分析该地区不同降雨强度及不同土地利用情况下降雨量—径流量、径流量—输沙量的相互关系特征,并模拟相应的数学表达式。结果表明:吕二沟流域同一土地利用情况下,场降雨量和场径流量之间存在指数函数相关关系,场径流量和场产沙量之间存在幂函数相关关系;相同降雨量条件下,同样的径流量,土地利用结构得到改善的土地利用模式3能有效地减少大降雨强度条件下的土壤侵蚀量,同样的径流量,降雨强度越大,场产沙量越大。从长远来看,改善流域土地利用结构,改变流域下垫面的情况,增加森林植被覆盖度是控制黄土高原水土流失的根本措施。
This paper describes a developed methodology based on the statistical analyses on sediment yield and runoff volume for individual rainfall events during 1982 - 2005 of the Lu＇ ergou watershed, located at the Ganshu Province, in the Loess Plateau. These analysis evaluated the relationships between timely runoff- rainfall and timely sediment runoff for different rainfall intensity and different land use patterns. For the relationships between timely, power and exponential functions were found regarding runoff-rainfall and sediment yield-runoff, respectively. This paper also presents the influences of land use variation on soil erosion under the circumstance of different rainfall intensity of the watershed. The results show that from the long run that is necessary to adjust the land use structure in order to improve the rate of forest land of the watershed. In addition, it is also needed to increase the vegetation cover of the watershed to control soil erosion in Loess Plateau.
出处
《中国水土保持科学》
CSCD
2009年第1期8-12,共5页
Science of Soil and Water Conservation
基金
国家自然科学基金项目“黄土高原多尺度耦合流域土地利用/覆被对水循环的影响及水文生态响应研究”(40871136)
关键词
降雨强度
输沙量
土地利用变化
黄土高原
rainfall intensity
sediment runoff
land use variation
Loess Plateau
