长江科学院院报2019，Vol.36Issue(12)：10-15,6.DOI:10.11988/ckyyb.20180673
长江源区河流地貌及水沙特性
Landform and Characteristics of Flow and Sediment of Rivers in Source Region of Yangtze River
摘要
Abstract
Characterized by various types of valley landscape, the source region of Yangtze River is densely covered by river networks, most of which are still in the process of natural evolution. In this paper, landform in the source region of Yangtze River is investigated based on SRTM3 DEM data of some representative river reaches, inclusive of Chumaer River, Tuotuo River, Dangqu River, Tongtian River, Buqu River, and Gaer River. Water and sediment characteristics are also analyzed from the observed data. According to the river valley shape and river landform, the river channel in the source region can be divided into three types: alluvial plateau, hilly valley, and alpine valley, among which the alluvial plateau is mostly featured by wandering or multiple branches, the hilly valley by single or branching plane form, and the alpine valley by single channel. Among the three source rivers, i. e. the south, north, and due sources, the discharge of Dangqu River (the south source) is the largest, and that of Chumaer Riv-er is the smallest; sediment discharge of Tuotuo River is the largest, followed by that of Chumaer River and Dangqu River in sequence. Moreover, suspended sediment in all the wandering river reaches, which is coarser and more u-niform, is larger in amount than in straight, curved, or branched river reaches; the width of river channel is posi-tively correlated with the sediment concentration of water flow, which preliminarily explains the causes of alluvial river formation.关键词
长江源区/河流地貌/水沙特性/游荡河型/泥沙特征/河流形态Key words
source region of Yangtze River/river landform/flow and sediment characteristics/wandering river/sedi-ment characteristics/fluvial morphology分类
建筑与水利引用本文复制引用
闫霞,周银军,姚仕明..长江源区河流地貌及水沙特性[J].长江科学院院报,2019,36(12):10-15,6.基金项目
国家自然科学基金项目(51609015,91647117) （51609015,91647117）
