海平面上升与地面沉降对黄河三角洲影响初步研究

EFFECT OF SEALEVEL RISE AND LAND SUBSIDENCE ON THE HUANGHE RIVER DELTA

沿海的黄河三角洲地势低淦,广大面积海拔不足2m,下一世纪海平面上升,加上地面沉降,大片低地将被海潮吞没,同时海水渗入内陆,农业将受巨大影响,必须及时采取有效措施,加以防范。

The Holocene Huanghe River Delta,with an area of 25,000km^2,is one of the largest deltas in the world.The paper focusses on its coastal plain,including 3 younger deltas,i.e.,the delta near Tianjin,the modern delta and the aban- doned delta.In the first two deltas,land subsidence,both natural and man- induced,is serious and recent sealevel rise is mainly relative and a result of land subsidence.The major direct impacts of relative sealevel rise on the Huanghe River Delta are submergence and salinity increase.As a great part of the three younger deltas is less than 2m above sealevel,with a rising sealevel,the da- nger of submergence is great,especially during the storm surge.With a rising sea level,low-lying coastal plain will increasingly suffer from salt water int- rusion and drainage will be more difficult.Decisive action is urgently needed to avert or mitigate adverse effects.