利用声学悬沙浓度剖面仪（AcP-1）和Endeco流速仪、双频测深仪等对长江口南港底沙再悬浮的浓度、流速和盐度、水深等进行连续14h定点同步观测。对长江口南港底沙再悬浮特征及其影响因子进行综合分析，结果表明：转流阶段再悬浮频率较小，强度较大；涨（落）急阶段，再悬浮频率较大，强度较小；过渡阶段，再悬浮频率和强度随流速同相变化；底沙再悬浮浓度的主要影响因子是盐度、流速、水深和悬沙粒径.再悬浮浓度与流速、盐度、水深和悬沙粒径的线性回归关系显著，相关系数达0.91，且流速、水深和粒径与之呈正相关，盐度与之呈负相关。

对长江口南槽底部水样中的含沙量、悬沙粒径以及水相和悬浮相重金属含量进行测试分析，探讨重金属的吸附规律及底沙再悬浮对水体自净能力的影响。依据长江口南槽底层悬浮相8种重金属元素的相关显著性分析，将重金属元素分为3类，分析表明，重金属元素在该水域进行的是选择性置换吸附。同时，主成分分析表明，第一主成分与第二主成分的累积贡献率达到89.3，两主成分已能较好地反映该水域重金属元素的变化，其中第一主成分的贡献率为7O.4，主要反映第一类元素cu、zn、As、Cd，说明这4种元素对长江口南槽重金属污染的影响最大。含沙量与元素吸附量的相关分析表明，随着泥沙含量的增加，单位质量悬浮泥沙吸附重金属元素的能力下降，总吸附量上升，但南槽底沙较强的再悬浮作用影响了相关显著性。水相中重金属浓度与底沙再悬浮作用强度有关，依据浓度剖面ACP图像，涨、落急阶段再悬浮作用强，泥沙含量高，重金属浓度一般较转流阶段低。

利用文献中的泥沙起动流速公式，推导出非均匀细颗粒泥沙起动流速近似估算公式。采用长江口南槽定点测量涨落潮过程中水深、水面以下1m的流速与近底床悬沙粒径d95资料，拟合该近似估算公式。估算结果表明：近底床悬沙粒径d95小于0106mm的细颗粒泥沙起动流速值大于已有水槽实验值。

Large jellyfish blooms have occurred in the East China Sea (ECS) during the last decade, a period also characterized by increasing fishing pressure, eutrophication, and changing climatic conditions. As large jellyfish bloomsmay have detrimental effects on fishery resources and ecosystem functioning it is desirable to understand the factors leading to jellyfish blooms. Therefore an Ecopath model covering the whole territorial waters of the ECS has been developed to address a number of questions about the impact and control mechanism of large jellyfish blooms on trophic structure and energy flows in the ECS. Model data collection for the ECS is based on records from 1997 to 2000. Forty-five functional groups are defined in the model including 32 fish (19 single species and 10multispecies), 2 benthic and 1 for each of the following: mammals, sea birds, sea turtles, primary producers, large jellyfish, cephalopods, shrimp, crabs, zooplankton, heterotrophic bacteria and detritus. The average trophic level of fishery catch in the ECS ecosystem for the period 1997-2000 was 2.71 while the mean value for all groups was 2.87. Analysis of the trophic interactions as identified a possible positive pelagic feedback loop allowing large jellyfish blooms to develop as a result ofmutual competition and predation between large jellyfish and Stromateoidae. This could be initiated by exploitation of Stromatidae. The pelagic pathway of the ecosystem will be disrupted at the initial stage of a large jellyfish bloom.

文章就潮滩一词探索其定义，明确其研究范围，以长江口--上海市潮滩、湿地为例，论述其基本特点，及其对长江来水来沙条件的响应，可开发的强度以及对湿地保护的要求，并就长江河口不同类型的潮滩分别阐述它们的发展过程、现状与趋势，对不同潮滩和湿地的合理开发、动态保护、生态修复提出具体意见，从发展要求提出应对近海水域空间开发进行研究的建议。