长江口澄通河段床沙粒度特征分析

为了进一步研究长江口水土资源和岸线开发利用工作对该段河床演变和水动力变化的影响，根据2012年及2013年枯水期长江口澄通河段两次大范围床沙取样监测成果，分析了各主支汊床沙的物质组成，粒度分布及丰枯水年粒度特征。结果表明：澄通河段主槽砂粒粗，浅滩砂粒细；主汊砂粒粗，支汊砂粒细；总体上，从上游向下游床沙粒度逐渐变细；主槽及主汊区域床沙类型主要为细砂及粉砂质砂，支汊及浅滩区域床沙类型主要为砂质粉砂及黏土质粉砂；2012年，全河段床沙的粒度组成表现为，砂含量大于粉砂含量，粉砂含量大于黏土含量。

Characteristics analysis of particle size of bed material at Chengtong reach of Yangtze River estuary

To further analyze the influence of water and soil resources utilization in Yangtze River estuary and the coastal line development on river bed evolution and hydrodynamics variation, on the basis of the result of two large-scale sampling investigation during the dry season of 2012 and 2013, we analyzed the bed material composition, particle size distribution and characteristics of particle size in flood and dry season respectively at Chengtong reach of Yangtze River estuary. The result indicated that the particle size in the main channel is thicker than that on the shoal and in the branch; the particle size decreases from upstream to the downstream generally. The major types of bed materials in the main channel area are fine sand and silt sand while the bed materials are sand silt and clayey silt on the shoal and in branch channel area; in 2012, the content of sand is the largest at this reach, followed by silt and clay.