南麂岛重现期波高空间分布特征分析

Characteristics of wave height spatial distribution with different return periods in Nanji Island

运用第三代海浪模式SWAN,建立浙江沿海波浪传播模型,选取1949—2016年68 a对平阳县南麂岛影响严重的118场台风进行计算,得到南麂岛周围海域年极值海浪场,经P-Ⅲ曲线拟合分析后得到不同重现期海浪空间分布场。结果表明:南麂岛西北方向的波高明显小于东南方向的波高。从海浪角度考虑,南麂岛马祖岙、国姓岙海域的波高明显小于其他海域的波高,是南麂岛开展渔业养殖的最佳地点。

Using the third-generation wave model SWAN,a coastal wave propagation model is established for the Zhejiang coastal area.A total of 118 typhoons that severely affected Nanji Island in Pingyang County from 1949 to 2016 are selected to calculate the annual extreme waves around Nanji Island.The P-Ⅲcurve fitting analysis is performed to obtain the spatial distribution of ocean waves with different return periods.The results show that the wave height northwest of Nanji Island is significantly smaller than that in the southeast area.From the perspective of ocean waves,the wave heights in the Mazuao and Guoxingao sea areas are significantly smaller than those in the other sea areas of Nanji Island,making them the best places for fishery and aquaculture in Nanji Island.