摘要
根据 2 0 0 1年 4月 1 0— 1 3日长江口大潮期 5个潮周期 3条测量船的同步连续观测资料 ,计算了长江口北支进入南支的净盐通量为 5 4 5× 1 0 6 t,这一结果为预测长江口南支及青草沙水源地的咸潮入侵强度和开发利用长江口淡水资源提供了重要数据。
Since the late 1950s, decreased discharge into the North Branch of the Changjiang estuary, combined with strengthened tidal current function and the gradual swallowing of the channel, has resulted in the North Branch transforming from an ebb dominated channel to a flood dominated channel. After the flooding of 1998, sedimentation rate in the upper reaches of the North Branch increased as did the tidal range. Under similar discharge conditions at Datong Station, chlorinity increased due to saltwater intrusion from the North Branch to the South Branch. A main reason for the rise of chlorinity in the South Branch and upstream regions of the South and North Channel(including the Qingcaosha water area)is the saltwater intrusion from the North Branch into the South Branch. From measurements of water depth, chlorinity, flow velocity and direction during five spring tidal cycles in April 10—13, 2001, net salt fluxes from the North Branch into the South Branch were calculated to be around 5 45×10 6t. This research provides the necessary data for prediction of the intensity of saltwater intrusion in the South Branch and Qingcaosha water area plus basis for utilization of the freshwater resources in the Changjiang estuary.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2004年第1期30-34,共5页
Oceanologia Et Limnologia Sinica
基金
上海市"重点学科建设项目"
上海市水务局
上海市原水股份有限公司联合资助项目20 0 1年
