洋山深水港海域水环境的周年变化

Annual Variation of Water Environment at the Sea Area of Yangshan Deep-Water Port

洋山深水港是上海国际航运中心的枢纽港，港口建设及外来船舶增加将对洋山深水港海域的水环境产生重要影响，因此，有必要对洋山深水港海域的水环境特征进行调研。2008年对洋山深水港海域的水环境因子进行了周年的调查研究。方差分析结果表明，洋山深水港海域表层水温、溶解氧、pH、盐度，电导率及悬浮物含量均存在明显的季节性变化（p〈0．01），季风和海流在洋山深水港海域水环境变化中具有重要的作用湘关分析结果显示，悬浮物含量与盐度之间没有显著相关性，长江口外泄泥沙的直接扩散，对洋山海区水体含沙量的影响较小。洋山深水港海域含沙量的大小，主要取决于波浪、潮汐及海流对当地浅滩的掀扬及输送。

Yangshan Deep-Water Port is the hub of Shanghai international shipping centre. The port construction and the increase in shipping vessel coming in and out will significantly influence the water environment at the sea area of the port. Water factors at Yangshan Deep-Water Port were investigated monthly in 2008 in order to illustrate characteristics of the water environment and its temporal variation. Results showed that monsoon and ocean current played important roles in significant seasonal changes of the water environment there （P 〈 0.01 by the variance analysis） in terms of superficial water temperature, dissolved oxygen, pH value, salinity, conductivity and suspended solids. There was no significant correlation between suspended solids and salinity according to the correlation analysis. It indicated that the direct diffusion of silt carried via Yangtze estuary affected a little to the silt content in the waters of the port, whereas the effects of waves, tides and ocean currents were important factors on the raise and transport of suspended solids from local shallows.