长江口北槽南导堤越堤输沙运动的时空变化特征研究

The temporal and spatial variations of the sediment flux overtopping the South Leading Jetty in the North Passage of the Changjiang Estuary

通过现场观测对长江口北槽南导堤越堤输沙运动的时空变化特征进行的研究表明:(1)南导堤沿程各测点各涨落潮过程单宽越堤净输沙量存在良好的线性相关关系;(2)S4-S7和S2-S3区段越堤输沙强度大,是主要输沙通道;(3)南导堤年平均越堤净输沙量约为296.6Mt,其中洪季、枯季分别占年均越堤净输沙量的62.24%和37.76%。

The temporal and spatial variations of the net sediment flux overtopping the South Leading Jetty in the North Passage of the Changjiang Estuary are studied based on the field measured data. The results show that： （1） timely varying unit width net overtopping sediment flux has a good linear relationship at each field measuring stations along the South Leading Jetty （2） sections of S4 to S7 jetty and S2 to S3 jetty are the leading sediment overtopping channel with extreamly high sediment transportation rate and（3） Annual averaged net sediment flux overtopping the South Leading Jetty is about 296. 6Mr, 62. 24% of which happens in the flood season and 37. 76M does in the dry season.