| 摘要: |
| 根据2001 年4 月10-13 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5.45*106t, 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。 |
| 关键词: 长江口北支, 现场观测, 净盐通量 |
| DOI： |
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| 基金项目:上海市/ 重点学科建设项目0 、上海市水务局、上海市原水股份有限公司联合资助项目, 2001 年 |
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| MEASUREMENT AND CALCULATION OF NET SALT FLUXES FROM THE NORTH BRANCH INTO SOUTH BRANCH IN THE CHANGJIANG RIVER ESTUARY |
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MAO Zh-i Chang1,2, SHEN Huan-Ting1,2, CHEN Jing- Shan1,2
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1.State Key Lab of Estuarine and Coastal Research, Institute of Estuarine and Coastal Research, East China Normal University;2.School of Resources and Environment Science, East China Normal University
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| Abstract: |
| 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 theNorth 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*106t. 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. |
| Key words: North Branch of Changjiang River estuary, Field measurements,Net salt fluxes |
