长江三角洲与苏北海岸动态类型划分及侵蚀危险度研究

利用统计分析模型对长江三角洲与苏北海岸动态类型及海岸侵蚀灾害危险度进行了初步研究。首先根据形态一致性将该区域海岸划分为21个岸段,选取年平均高潮位、潮滩宽度、潮滩平均坡度、平均高潮位以上潮滩滩高、0－5m海水年平均含沙量,年淤进率,年蚀退率,年下蚀率,年积高率和潮滩年沉积量等10个变量描述海岸潮滩动力、形态和演变特片,利用因子分析和聚类分析,提取共通性变量,综合反映潮滩的自然特征,对海岸进行定量化类型划分,并根据各岸段主成分得分评价各岸段海岸侵蚀的危险度。

Determination of classification and risk in the coastal zone of Yangtze Delta and North Jiangsu

By using a mathematic model, the determination of classification and risk degree in the coastal zone of Yangtze Delta and North Jiangsu was studied in this paper. At first, the whole coastal line are subdivided into 21 stretches. Each of which was described by ten variables : the average high tide, the with of tide flat, the average slope of tide flat, the elevation of the backshore, the sand amount in water between 0-5m. The mean accretion rate, the mean retreat rate, the erosion rate, the deposit rate, and the amount of deposition which described the characteristic of hydrodynamic, morphological feature and evolutionary trend. The matrix of the variables was pro- cessed using factor analysis and cluster analysis. The results of this investigation enable us to group similar coastal tracts. This in turn allowed us to classify the coastal zones and to attribute a degree of risk to the coastal erosion.