论文部分内容阅读
横沙通道是长江口南北港之间的横向支汊,近百年来,随着河口沙岛长兴岛与横沙岛发育成形,两岛之间的涨潮沟演变为沟通南、北港的潮汐通道(图1)。鉴于通道走向与长江口潮波传播方向(NW～SE向)基本一致,通道两端潮汐位相差成为河槽稳定的基本条件。目前,横沙通道的平均河宽1100m,0m以下河槽断面积约6350m~2,通道轴线最浅水深1999年5月为8.9m,每个潮周日通过的涨、落潮量达1.53～3.20亿m~3,从北港通过横沙通道进入北槽的净流量为0.26～1.17
The Hengsha Channel is a horizontal branch between the North and South ports of the Yangtze River estuary. Over the past century, with the development of the Changxing Island and Hengsha Island of the estuary sand island, the tidal channel between the two islands has evolved into a tidal channel connecting south and north ports figure 1). In view of the fact that the channel direction is basically consistent with the tidal wave propagation direction (NW ~ SE direction) in the Yangtze River estuary, the difference of tidal position at both ends of the channel has become the basic condition for the stability of the channel. At present, the mean channel width of the Hengsha channel is 1100m, the channel area below 0m is about 6350m ~ 2, the shallowest axis of the channel axis is 8.9m in May 1999, and the up-and-down ebb of each tidal day reaches 1.53 ~ m ~ 3, the net flow from North Harbor into North Slope through Hengsha channel is 0.26 ~ 1.17