摘要
本文在以前一系列研究的基础上,把长江河口最大浑浊带视作一个系统,对它形成的环境背景、时空变化规律、泥沙来源、絮凝作用对悬沙落淤的影响、浮泥的特性与分布、悬沙的富集机制等进行了较系统的综合分析,并指出了需要深入研究的问题。
Turbidity Maximum widely exists in various estuaries. It is a typical phenomenon reflecting the transporting process of fine sediments in estuaries. In the processes of estuarine sedimentation it play an important role in aggregation and sedimentation of fine particles. It also significantly affects the chemical behavior of heavy metal elements and organic materials as well as their transportation and deposition.
As early as the early 1960's the Chinese sci ntists have paid attentions to the problems related to the Turbidity Maximum in the Changjiang Estuary. However, it is not until the 1970's that the specific studies began to be carried out. On the basis of previous studies, this paper considers the Turbidity Maximum as a system and therefore makes a systematic and comprehensive study on its environmental background, patterns of temporal and spatial variation, sediment source, the effect of flocculation on sedimentation of suspended sediments, the characteristics and distribution of fluid-mud and enrichment mechanism of suspended sediments. Problems that require further study have been proposed at the same time, such as a quantitative analysis of sediments with different sources, the relative importance of each mechanisms for the development of Turbidity Maximum and its temporal-spatial variation, the mechanism of deposition and re-suspension of medium to fine-grained sediments in the system of suspended sediments, fluid-mud and bottom sediments, the mineral composition and structure of fluid-mud, its rheological characteristics, application, flux as well as its behavior in the estuarine biogeochemical processes. The improvement of waterway associated with the study of Turbidity Maximum, especially the water depth and the practical approaches, are also important problems to be further studied.
出处
《地理学报》
EI
CSSCI
CSCD
北大核心
1992年第5期472-479,共8页
Acta Geographica Sinica
基金
国家自然科学基金资助项目研究成果之一。
关键词
河口
环流
浑浊带
研究
Estuary
Turbidity maximum
Estuarine circulation
Flocculation
Fluid-mud
Sand bar
