长江泥沙的来源,输移和沉积特性分析

本文依据大量原型观测资料和分析研究成果,论述了长江泥沙的来源、输移及沉积特性。文中对影响流域产沙的气候条件、下垫面条件及人类活动等项主要因素进行了分析,并根据近期资料统计,长江流域的土壤侵蚀总量为22.39亿t。流域产沙具有泥沙输移比小和产沙地区集中两个基本特征。河流泥沙的沉积主要为水库淤积、湖泊沉积和河床的冲淤。

Characteristic Analyses of Sediment Yielding, Transportation and sedimentation in Yangtze River

Based on a large amount of prototype observations and scientific payoffs , this paper discusses the characteristics on source, transportation and sedimentation of the Yangtze River Sediment. In this paper , main factors for the conditions of climate , underlying surface and human activities affecting sediment yielding within catchment have been analyzed . According to statistical data in recent period, the volume of soil erosion in this basin is 2. 239 billion tons . Sediment yielding within catchment features small transport ratio and concentration on region. The deposition for river sediment is mainly reservoir sedimentation, accretion in lake and aggradation and degradation on river bed .