沟道流域坡面与沟谷侵蚀演化关系——以晋西王家沟小流域为例  

A study of landform morphologic relationships between hillslopes and gullies:taking small catchment of Wangjiagou in west Shanxi as a case

作　　者：陈浩[1] Y.Tsui 蔡强国[1] L.G.Tham 胡文生[1] Z.Q.Yue 黄建国[3] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101 [2]香港大学土木工程系 [3]西南农业大学资源环境学院,重庆400716

出　　处：《地理研究》2004年第3期329-338,共10页Geographical Research

基　　金：香港特区政府研究资助局支持项目 (HKU 70 17/ 0 1E);国家基金委和黄河水利委员会重点基金项目( 5 0 2 390 80 );中科院地理科学与资源研究所知识创新工程领域前沿项目(CX10G A0 0 0 5 0 2 )

摘　　要：以往坡、沟侵蚀关系研究主要限于水沙关系的探讨 ,有关原型尺度小流域坡、沟地貌侵蚀演化关系的定量研究甚少 ,尤其是坡、沟地貌特征对流域切割程度的综合影响与交互作用的定量研究尚属空白。本文在 3S技术支持下 ,根据晋西王家沟小流域 196 7年 1∶5 0 0 0正摄影像图 (DOM )、高程数字化模型 (DEM )和同期、同比例尺地形图 ,利用正交多项式回归分析方法 ,定量分析了坡、沟地貌特征对流域切割程度的影响与交互作用。研究表明 ,沟谷地在流域地貌演化及地表切割程度中起主导作用 ,在沟间地面积相同时 ,沟谷地面积约为0 1km2 是影响流域切割裂度侵蚀演化强度最大的区域 ,流域面积愈小影响流域地表破碎的程度最大。其沟道流域坡、沟地貌演化机制可用坡。Previous studies on relationships between hillslope and gully erosion are mainly concentrated on exploration of water and silt relations, few on quantitative studies of evolution relationships between hillslope and gully landform erosion in small catchments of original scales Quantitative studies on synthetic impact and interactions of hillslope and gully geomorphologic characteristics on catchment dissected extent are still a blank in particular This paper, supported by 3S techniques, based on 1∶5000 digital orthophotomap (DOM), digital elevation model (DEM) and topographic map of the same period and of the same scale, quantitatively analysed the impact and interactions of hillslope and gully geomorphologic characteristics on catchment dissected extent by using orthogonal polynomial regression analysis Research results indicated that gullies play a leading role in the catchment morphologic evolution and ground surface dissected extent When inter gully areas are the same, the 0 1 km 2 gully area is the maximum area affecting erosive evolution intensity of the catchment dissected extent The smaller the catchment area is, the greater the affecting extent of catchment surface fragmentation would be The geomorphologic evolution mechanism of channel slopes and gullies can be explained with synthetic impact of geomorphologic indicator of slope and gully fluvial energy Gullied land plays the leading role in affecting catchment dissected extent indicators of D r and L e , when inter gullied land area ( A p ) is constant, there exists maximum value of the dissected extent indicator L e and critical gully catchment area, the catchment dissected extent is the greatest when gully catchment area is about 0 1 km 2. The smaller the gully catchment area is, the greater the gully density would be. When inter gullied land area increases, the dissected extent indicators D r and L e decrease. When gullied land area ( A g ) keeps constant, the catchment dissected extent indicat

关 键 词：坡面与沟谷侵蚀 小流域 黄土高原 

分 类 号：P512.2[天文地球—地质学]