北海银滩海岸冲刷及环境污损原因分析

Causes of Environmental Pollution and Erosion of Yintan Beach in Beihai City of Guangxi

北海银滩位于广西北海市海岸东面 ,目前出现 ,海岸冲刷后退、沙滩变陡萎缩、沙滩表层变“黑”、海域水质污染现象。原因是 :泻湖口门防波堤拦截了西向沿岸的输沙 ,挡浪墙破坏了沙坝滩面的整体性 ,挡浪墙伸入潮间带加剧了墙前冲刷 ,沙滩严重冲刷使滩面变“黑”;生活污水、渔港排污、泻湖内港底质有机污染使海域污染严重。为改良银滩环境 ,建议拆除部分建在潮间带上的建筑物 ,如宾馆、商店、挡浪墙 ;缩短防波堤工程 ,在潮间带上种植林带 ;用机械或人工方法进行泻湖底泥清淤 ;在银滩附近建立污水收集系统。

Yintan beech is located in the east beach of Beihai City,Guangxi,south China It is found that the coastal line backs off,the sand foreshore is getting steep and smaller,the dark layer under surface comes out,the sea water is polluted The causes for these phenomena are that the wave blocked dam in the lagoon jaw blocks the transfer of sands from the westward coast;the wave blocked wall breaks the integration of sand bar and beach face;The extending of the wave blocked wall into tidal zone accelerates the erosion of the sea floor in front of the wall Heavy erosion of sand beach makes the dark layer under surface reveal The city sewage,fishing boat oil,organic pollution of the silt in the bottom of lagoon inner harbor severely polluted the sea area In order to improve the environment of Yintan Park,it is suggested that backouting some of the constructions in tidal zone such as hotels,stores,part of wave blocked wall;shortening wave blocked dam;planting trees in tidal zone;clearing out silt in the bottom of lagoon by machine and manpower;building up sewage collection system near the park