长江口浮泥层“适航水深”初步研究

Study on the Nautical Depth Utilizing Fluid Mud Layer of the Changjiang Estuary

长江口入海航道７米挖槽开挖以后，洪季挖槽内出现１２米的浮泥层，引起了生产部门和研究机构的高度重视。本文介绍了长江口浮泥的一般情况，讨论了浮泥层变化的某些规律、探讨了在长江口测量浮泥层底板水深制作海图、充分利用浮泥层作为通航水深，在理论上和实践上都取得了一定的成绩。

m depth of the waterway flowing into the sea of the Changjiang Estuary is succeeded by the dredging since the mid 1970s. However fluid mud is appeared in the dredged channel during the flood season. Fluid mud is the turbidity water, its unit weight is 1.04-1.259/cm3. This paper describes the specific gravity, the clay mineral construction, the rheological behavior and discusses the distribution feature, the law of various periodic changes of fluid mud of the Changjiang Estuary. In order to reduce the dredging cost,it is important to study the nautical depth. Base on the experiences of other countries in studying fluid mud, and the nature of movements of fluid mud in the Changiiang Estuary, it is proposed that the fluid mud layer which the unit weight is 1.25g/cm3 can be regarded as a critical limit for the nautical depth of the Changiiang Estuary. Some experiences are gotten in the practise.