Abstract:

In recent years，with sea levels rising and sediment reducing，the Yangtze River Delta region is facing the threat of coastal erosion.This paper applied fuzzy comprehensive assessment method to evaluate the coastal erosion in the Yangtze River Delta.The assessment factors were sealevel rise rate，ground subsidence rate，average high tides，offshore sea water sediment，tidal slope，tidal width and coastal line change rate.8 coastal segments in the Yangtze River Delta were selected as the object of study.It applied Fuzzy method and CVI model into studying the Yangtze River Delta Coastal Erosion vulnerability，combined with GIS and then depicted the coastal vulnerability map.The results showed that the Yangtze River Delta coastal vulnerability profiles revealed clear regional differences.And the CVI result had great relevance to the Costal erosion status in the Yangtze River Delta.It indicated that fuzzy comprehensive assessment of coastal vulnerability was an effective way to study the Yangtze River Delta coastal erosion risk.Finally，it predicted that the Yangtze River Delta coast had a  trend to the high vulnerability in the next several years according to evaluation results.And the trend of silt up will be slower，while the erosion will be intensifier，and high vulnerability coastal sections will increase.〖