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河口环流和盐水入侵Ⅱ-径流量和海平面上升的影响 被引量:10

Estuarine Circulation and Saltwater Intrusion Ⅱ: Impacts of River Discharge and Rise of Sea Level
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摘要 本文利用本序列上篇论文建立的理想河口数值模式,研究径流量和海平面上升对河口环流和盐水入侵的影响.在径流量增大的情况下,口门内表层向海的流速增大,底层向陆的密度流减弱,滞流点下移.口门外侧向口门的密度流增大,上升流趋于增强.口门内盐水入侵减弱,口外盐度减小、冲淡水扩展范围增大.在口门上游北岸底层盐度下降明显,口门处南岸表层盐度下降明显.径流量变化对盐水入侵影响十分巨大.在海平面上升的情况下,拦门沙区域向陆的密度流增强,滞流点上移,表层向海的流动增大.口门内盐水入侵增强,口外盐度增大,冲淡水扩展范围减小.海平面上升对盐水入侵影响十分明显,北岸底层盐度增大尤为特出. By using the idealized estuary numerical model described in part Ⅱ of this series study, the impacts of river discharge and rise of sea level on estuarine circulation and saltwater intrusion are studied in this paper. In the case of river discharge increase, the current speed at the surface layer within the mouth increases, the land ward density induced current at the bottom layer reduces, and the point of no current moves downstream. The mouth ward density induced current outside the mouth becomes larger, and the upwelling tends to increase. The salinity intrusion within the mouth reduces, the salinity becomes lower and the area of diluted water increases outside the mouth. The salinity drops remarrably at the bottom layer and the upstream north coast of the mouth, and at the surface layer and the south coast at the mouth. The variation of river discharge has a huge influence on the saltwater intrusion. In the case of sea level rise , the land ward density induced current at the sand bar increases, the point of no current moves upstream, and the current speed becomes larger at the surface layer. The salinity intrusion within the mouth increasts, the salinity becomes higher and the area of the diluted water reduces outside the mouth. The rise of sea level has an obvious impact on the salinity intrusion, especially at the bottom layer and the north coast.
作者 胡松 朱建荣 傅得健 吴辉 Hu Song\ Zhu Jianrong\ Fu Dejian \ Wu Hui(State Key Lab. of Estuarine and Coastal Research, East China Normal University, Shanghai 200062,China)
机构地区 华东师范大学
出处 《青岛海洋大学学报:自然科学版》 CSCD 北大核心 2003年第3期 337-342,共6页 Journal of Ocean University of Qingdao
基金 上海市青年科技启明星计划,上海市教委"曙光计划",高等院校骨干教师基金
关键词 河口环流 盐水入侵 径流量 海平面上升 ECOM模式 数值试验 动力机制 estuarine circulation saltwater intrusion river discharge rise of sea level numerical experiment
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