The modern change and evolution tendency of sand coast in the eastern area of Liaodong Gulf

Ｔｈｅ　ｍｏｄｅｒｎ　ｃｈａｎｇｅ　ａｎｄ　ｅｖｏｌｕｔｉｏｎ　ｔｅｎｄｅｎｃｙ　ｏｆ　ｓａｎｄ　ｃｏａｓｔ　ｉｎ　ｔｈｅ　ｅａｓｔｅｒｎ　ａｒｅａ　ｏｆ　Ｌｉａｏｄｏｎｇ　ＧｕｌｆＭｉａｏＦｅｎｇｍｉｎ；ＢｉＺｈａｏｑｉ；ＬｉＳｈｕｙｕａｎ；Ｘｉａ...

The modern change and evolution tendency of sand coast in the eastern area of Liaodong Gulf

In studying sand beach erosion and protection tactics in Liaoning Province, the authors calculated the wavedata of 27 a Period (1963-1991) at Bayuquan Observation Station in Liaodong Gulf. Together with the beach levellingsand some simple marking stakes monitoring and by having the aid of local annals, the paper analysed the present situationsof the coastline and the causes of sand coastal recession and serious consequences, and then discussed the dynamic processof alongshore sand transport. Simultaneously, based on alongshore sand transport model, oneline cut-and-fill theory anddynamical water model(sea level rise), the authors preliminary estimated beach process for the future in the area.Recently, the coastline is being eroded and 2/3 of the sand coast is subjected to erosion, which the recession rate ofthe individual sector exceed 7. 0 m/a. Coastal erosion has threatened villages, roads, factories and tourist resources. Sealevel rises and the decreasing amount of materials by rivers discharged into the sea and the activities of man, made coast line recession rate accelerate, and cause a great loss of land in the area.