冬、夏季北黄海悬浮物分布特征

Sediment distribution features in the North Yellow Sea during Summer and Winter

利用国家908专项ST02区块(北黄海)水体专项调查2007年夏、冬资料,应用浊度观测资料对悬浮物质量浓度进行线性拟合,得到较好的反演结果。在北黄海海域选取了具有代表性的9个断面,利用反演的悬浮物质量浓度,综合温度、盐度等水文要素,辅以冬、夏季山东半岛沿岸流、北黄海冷水团和黄海暖流的季节变化特征,着重分析了冬、夏季北黄海悬浮物分布特征、形成原因以及季节变化。研究结果表明,冬、夏山东半岛北部沿岸、成山头海域和老铁山水道以及旅顺湾附近海域始终为高悬浮物浓度区,呈现出近岸高,离岸低,底层高,表层低的态势。夏季,水体垂向层结显著,受北黄海冷水团以及沿岸流的作用,老铁山水道附近及山东半岛北部沿岸的高悬浮物浓度值区基本不能进入北黄海,只能沿岸分布,并且由于海底底质为粘土质以及沿岸流的共同作用,成山头附近海域悬浮物浓度值很高,但基本为局地再悬浮,没有向外输送的趋势。冬季受强劲东北风的影响,水体垂向混合均匀,悬浮物浓度值比夏季高得多,悬浮物的分布受黄海暖流、沿岸流以及地形的影响,特别是成山头附近海域,存在一个显著的高悬浮物浓度值区,并具有向南输送的特征。

According to the data in summer and winter from the project named National Coastal Sea Comprehensive Investigation and Evaluation（908ST02）,it could be concluded a good linear fitting relationship between the sediment and the turbidity.There are 9 sections selected in North Yellow Sea in order to study the sediment distribution features,the reasons and the seasonal variations,which are combined with the temperature and salinity elements.Shandong peninsula coastal current,cold water mass and seasonal variation features are also considered.It shows that the high sediment concentration regions are always at Shandong peninsula coast,Chengshantou region,Laotieshan channel and Lvshun Bay.It indicates that the sediment concentration is high near the shore,low at the centre,high at the bottom,low at the surface in summer and winter.In summer,the vertical stratification is quite strong.The high sediment concentration regions in Laotieshan channel and Shandong peninsula north coast could not enter to the centre of North Yellow Sea due to the cold mass in North Yellow Sea and coastal currents.The highest concentration region is around the Chengshantou because of the lutaceous bottom and the coastal current,though it does not have the tendency to transport to outside and it is almost local resuspension in this area.In winter,due to the strong northeast wind,the vertical mixing is uniform.The sediment concentration in winter is much higher than that in summer.The distribution of sediment concentration is affected by the warm current,coastal currents and terrain of the Yellow Sea,specially around the Chengshantou area where exists a high concentration region with the feature transporting to south.