长江下游上河口段北岸无凝聚性砂岸的变形破坏规律

长江下游上河口段北岸,属南通市城港口范围,岸线在平面上是反“S” 型,大部分处于凹岸的顶冲区,尽管江岸的演变受诸如河型,迳流、潮汐、科氏力等主要因素的影响,但其变形破坏规律恰受以细粉砂层为主体的这一江岸介质条件的制约。文中分析了发生于近数十年来江岸的各种变形破坏形式和规律。对是否存在砂体的渗透变形问题,据水位观测,室内渗透变形试验和现场调查所得,亦作了较详细的分析。

THE DEFORMATION AND DESTRUCTIVE LAW OF THECOHESIONLESS SAND BANK OF THE HIGHERRIVER MOUTH IN THE LOWER REACHOF THE YANGTZE RIVER

The northern bank of the higher river mouth of the Yangtze River's lower reach is a part of the port city-Nantong,its water front tooks like anti-"s" shape, and it mostly belongs to the swash area of out bank. The deformational and destructive law of the bank is restricted by the factors, such as river shape, runoff, tide and Coriolis force etc. Not only the deformational and destructive forms and laws have been studies in the recent ten years, but also the detailed analysis of the problem whether there is permeability and deformation in the sandy soil has been made in this paper.