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《Geographical Research》 2004-03
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A study of landform morphologic relationships between hillslopes and gullies:taking small catchment of Wangjiagou in west Shanxi as a case

CHEN Hao 1 , Y Tsui 2 , CAI Qiang guo 1 , L G Tham 2 , HU Wen sheng 1 , Z O Yue 2 ,HUANG Jian guo 3 (1 Institute of Geographic Sciences and Natural Resources Research, CAS,Beijing 100101, China; 2 Department of Civil Engineering,Hong Kong University, Hong Kong, China; 3 College of Resources and Environment,Southwest Agriculture University, Chongqing 400716,China)  
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 indicators D r and L e decrease with the increase of inter gullied land area.Catchment dissected extent is synthetically affected by fluvial erodibility under conditions of varying gradients of inter gullies and gullies and their interactions. The evolution mechanism of slope and gully landforms of gully catchment can be explained via synthetic effect of slope and gully fluvial energy landform indicators and their interactions.According to erosional characteristics of slope and gully landforms, to elevate erosional basement level is the key link for controlling modern gully head advancement and hillslope expansion rate of the catchment basins. Priorities should be given to soil and water conservation management of gully catchment area of 0 1 km 2.
【Fund】: 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 )
【CateGory Index】: P512.2
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