人类活动对地球系统的影响，已由“局部”进入到“全球”。河口是一个复杂的自然综合体，在地球系统中能体现全球的变化，也能敏感地响应流域的自然变化和人类的作用。由于资源开发和人工控制增强，第三驱动力在长江河口过程中已经和将要发挥越来越重要的作用。因此,如何体现人与自然的和谐，河口怎样才能健康地发展，将是河口研究的重要理论和实践问题。文中以长江河口为例，探讨它的自然演变与自然适应、发展中的人工控制、自然资源的开发以及涉及河口当前的悬念问题，并就人与自然的和谐提出建议。

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.

The response of subaqueous dunes to the variation of riverine sediment supply in an estuary is rarely reported. Five sets of field measurements of bed sediments and topography were made in the Changjiang estuary, China during dry and flood seasons for the past 9 years. Results show that dunes were mainly three-dimensional (3D) during flood seasons and two-dimensional (2D) dunes during dry seasons. Dunes were also much larger in flood seasons. Dunes mainly occurred within the main channels of the estuary although they extended 11.7 km seaward of their normal extent in the South Channel during dry seasons from 2002 to 2006. This extension of the dune field is likely due to a sharp decline of sediment discharge caused by large reservoirs such as Three Gorges.

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。

通过2004和2005年对崇明岛前缘（大潮时水深3-5m）分别进行了2个航次的水深测量，分析水下韵律地形发育对水深的影响。结果显示，（1）崇明岛前缘发育有高度约0.2m工m-0.75m、长度约100m-630m的脊槽型韵律地形，且自陆向海剖面上冲淤变化显著.冲淤厚度可达0.2-0.6m.这些脊槽型韵律地形及其快速冲淤变化是近岸小型航行器械及其安全以及工程设施是一种较大的灾害隐患