聚类分析方法在泥沙粒径分级模拟中的应用研究

Application of Clustering Analysis to Simulation Model of Different Sediment Grain Size

以珠江河口八大口门海域为研究区域,选取在伶仃洋采集的174个浅底层泥沙样本,用模糊聚类分析的方法将泥沙分为三级,然后利用平面二维水动力模型和泥沙输运扩散模型进行数值模拟.模拟结果以虎门和磨刀门的泥沙浓度较高,细颗粒泥沙在洪奇沥出口下方和淇澳岛形成了高浓度区,而且细颗粒泥沙的输运距离较远.从水动力及泥沙分布特征分析,模拟结果基本合理.

The Eight Gates of Pearl Estuary are chosen as the study area. The 174 pieces of silt samples that collected on the near bottom in the LingDingYang Estuary are chosen and classified into three groups with the methods of clustering analysis, and then put them into the two dimensional hydrodynamic and sediment transport models. The result is that the concentration of silt is higher in Humen and Modaomen than the others. The silt powder sand and the powder sand are formed a higher concentration area in the inferior of Hongqili and Qiaodao, and the distance that the silt is transported is longer than the larger granule. According to the analysis on the characteristic of hydrodynamic and distributing sediment, it seems that the result of numerical simulation is reasonable.