长江口北槽挖槽段泥沙淤积特性研究

A Study on Sedimentation in the North Trench of Yangtze River Estuary

本文通过近几年的大量实测资料分析北槽挖槽段泥沙淤积特性，并解释其产生的原因。研究表明：北槽挖槽段泥沙淤积呈三峰型，其主要淤积部位在２６４－２７１灯浮区，南槽、北港水沙与北槽交换的影响使得北槽拦门沙位置上移。三峰型淤积机理各不相同，桃汛时泥沙主要在３＾＃测点附近集中淤积，洪汛时泥沙在北槽全槽淤积，汛后期泥沙在挖槽段内淤积，实质是洪汛北槽下段的淤积泥沙在时间和空间上的调整。

The Characteristics and the mechanism of sedimentation in the North Trench of Yangtz River Estuary were analyzed by the available hydragrophic data measured in the past few years.The rusults show that there is a three-peaks type of full year sedimentation in North Trench and between 264-271 navigation mark is the major area for sedimentation.The exchanges of water and sediment among South Trench,North port and North Trench make the sand bar of North Trench moving forward to the inside of the estuary.The mechanism of each sedimentation peak in full year process is different,in which,the first sedimentation peak occurs at 3#mea-surement location in spring season,the second one,sedimentation in full North Trench occrs in flood season and the last one is formed by the rearrangement of the sedimented in low watr season.