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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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长江口水沙入海通量的观测与分析
DOI: 10.11821/xb200601004, PP. 35-46
Keywords: 径流量,悬沙浓度,ADCP,潮流,长江口
Abstract:
在长江口用声学多普勒流速剖面仪(ADCP)进行走航式断面观测，结果表明，采集水样获取的悬沙浓度与ADCP记录的声学信号(后向散射强度)之间存在显著相关关系，因此可据ADCP声学数据获得沿观测断面的高时空分辨率的悬沙浓度剖面。分析结果表明，在徐六泾附近断面以往复流占优势，大潮期间单位时间最大水、悬沙通量值出现于涨潮期，落潮历时较长，落潮期水、悬沙通量分别大于涨潮期水、悬沙通量，净通量向海。长江口南槽拦门沙外侧主要为旋转流，涨潮期间内的水、悬沙通量均分别大于落潮期间的水、悬沙通量。2003年11月12日的观测结果表明，潮周期内通过徐六泾断面向海输运的水与悬沙通量分别为109m3和108kg量级；径流量与悬沙输运率分别为104m3/s和103kg/s量级。1998年以来徐六泾ADCP流量观测数据与同时间的大通径流量之间存在着显著的相关关系，故可由大通径流量估算徐六泾径流量，作为长江入海径流量，以作为历史资料整编的一种手段。结果表明，长江入海年径流总量略大于大通年径流总量；而在枯水期间入海径流量小于大通径流量。
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