广东雷州电厂近岸沉积特征及泥沙运动

通过对广东雷州电厂海岸动力地貌进行调查,分析研究了厂址及周边海岸冲刷、堆积或平衡等不同地貌形态特征、岸线冲蚀形态、泥沙运动及海岸演变对电厂取排水深的影响。分析结果表明,水下沉积物以粉砂质粘土和粘土质粉砂分布为主,样品的平均中值粒径为0.0102mm,南部区域略粗于北中区域,从沉积物分布特点和趋势看,近岸与河口区物质偏粗,主要受近岸及河流的影响;而距岸不远的沉积泥沙中值粒径均在0.004mm左右,则明显受海向沉积泥沙的影响。由于工程区处于岬角且泥沙来源数量少,受波浪潮流共同作用,电厂工程区水域海床及岸线多年处于冲淤平衡的基本稳定状态。

Sedimentary characteristics and sediment movement in inshore zone of Leizhou Power Plant in Guangdong Province

By dynamic geomorphic investigation on inshore zone of the project,the influences of sediment movement,coastal evolution and various geomorphic types such as coastal erosion,accumulation and equilibrium in the construction site and the area nearby on water depth of water intake and outlet of the Leizhou Power Plant were analyzed in this paper.The analysis results demonstrate that the sediment on the seabed mainly includes silty clay and clayey silt,the mean median grain size of the sample is 0.010 2 mm,the sand in south area is slightly coarser than the one in middle north area.In the view of sediment＇s distribution characteristics and sedimentary trend,the sand in offshore zone and river mouth is coarser due to inshore current and river current. Because of the marine sediment,the sand＇s median size nearby the coast is approximately 0.004 mm.Because the project locates in the cape and the sediment supply is less,under the joint action of wave and tide current,the sea bed and shoreline within the sea area of the power plant are basically stable and on the state of equilibrium between erosion and deposition over the years.