摘要
在洋山港内和航道水域进行沉积柱状取样,对这些沉积柱状样品分别进行沉积物粒度、210Pb和137Cs分析。结果表明,港内水域沉积物粒度总体较粗,砂和粉砂的含量平均近80%,粘土含量平均20%,平均粒径为5.62～6.22φ。航道和附近水域沉积物粒度比港内水域略细,砂和粉砂含量平均为75%,粘土含量平均为25%。210Pb和137Cs年代测年表明,港内水域的沉积速率为每年0.93～1.56cm,航道水域的平均沉积速率为每年0.66cm,航道南部水域沉积速率为每年2.71cm,北部水域平均沉积速率为每年1.77cm,局部地区处于冲刷侵蚀状态。总体来说,该海区沉积环境较为稳定,水动力作用较强,沉积速度缓慢,处于基本冲淤平衡的状态。
Cores in the Yangshan harbor and its sea-route areas including granularity, ^(210)Pb, and ^(137)Cs are sampled and analyzed. According to the results, the sediment granularity in the harbor area is generally coarse, the average content of sands and silts is 80%, the average content of clays is 20% and the average grain diameter is 5.62～6.22φ. The sediment granularity in the sea-route area is finer than that in the harbor area, the average content of sands and silts is 75%, and the average content of the clays is 25%. According to the age determination of ^(210)Pb and ^(137)Cs, the average sediment rate is 0.93～1.56 cm/a in the harbor area, 0.66 cm/a in the sea-route area, 2.71 (cm/a) in the south area of the sea-route and 1.77 cm/a in the north area of the sea-route with a part of the area being eroded. Generally, the sediment environment is relatively stable, the hydrodynamic force is relatively strong, the sediment rate is slow, the erosion and the accumulation are in the state of equilibrium on the whole.
出处
《海洋工程》
CSCD
北大核心
2005年第2期77-81,共5页
The Ocean Engineering
