无定河流域沟谷密度特征及其影响因素分析  

Characteristics of gully density in the Wuding river basin and its influencing factors

作　　者：杨岩岩[1] 刘连友[1] 

机构地区：[1]环境演变与自然灾害教育部重点实验室,北京师范大学,北京100875

出　　处：《干旱区资源与环境》2014年第3期79-85,共7页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金沙漠/黄土过渡带土壤复合可蚀性研究(40771021);沙生植物构型特征抗风蚀机理研究(41071331)资助

摘　　要：利用SRTM DEM和TM数据及Arcgis软件,计算了无定河流域沟谷密度,并分析了其影响因素。结果表明:1)总的沟谷密度(Dn)为D沙漠区<D沙漠-黄土区<D黄土区,分别为0.057km/km2、0.337km/km2、2.537km/km2,过渡性明显;不同区内,除第3级沟谷外,相同等级的沟谷密度(Dni)为D沙漠区i<D沙漠-黄土区i<D黄土区i;同一区,随沟谷等级的增大,沟谷密度在增大。2)沟谷数量(Nn)为N沙漠区<N沙漠-黄土区<N黄土区,其中黄土区沟谷多达49962条;同一区,随沟谷等级的增大,沟谷数量也在增大,而沟谷的平均长度在减小。3)地质因素、降雨量和下垫面性质是影响沟谷密度分布差异性的主要因素。We calculated the gully density in the Wuding River basin and analyzed the influencing factors by using the SRTM DEM,TM and Arcgis software.The results are as follows：①D desertD transitionD loess,the total gully density（Dn） are 0.057km/km2、0.337km/km2、2.537km/km2,respectively,which shows transitional characteristic obviously;and except the class 3,the same class gully density（Dni） is D desertiD transitioniD loessi in the different area.As the increasing of the gully class,the gully density is growing in the same area.②The number of the gully（Nn） is N desertN transitionN loess,the largest number is 49962 in the loess area.In the same area,as the increasing of the gully class,the number and average length are growing too.③The main influencing factors are geologic factor,precipitation and the property of the underlying surface.

关 键 词：无定河流域 沟谷密度 影响因素 

分 类 号：S157[农业科学—土壤学]