基于ERA-Interim再分析资料的南沙海域风、浪场特征分析

Characteristics analysis of wind and wave in the Nansha Aera based on ERA-Interim reanalysis data

基于ERA-Interim再分析资料,统计分析了南沙海域的风场、海浪场的时空特征,并进一步研究了风浪成长关系,建立了适用于南沙海域的风浪模型。月平均场分析结果表明:在季风期,南沙海域的月平均有效波高与风场的时空分布特征有良好的对应关系,位于中南半岛的东南部存在一个风速和有效波高的大值中心,冬季强于夏季,中心位置随季节转换稍向下风向移动。频率分析结果表明:南沙海域全年以4级以内风力和3级以内海浪出现的频率最高,6级以上大风和5级以上海浪主要出现在冬季风期间;全年最大风速和浪高出现在10、11月,最大风速达到8级,最大有效波高可达6级,但频率非常小;整个海域风速和浪高最小的时期是4—5月。

Based on the ERA-Interim reanalysis data, the spatial and temporal characteristics of wind and wave fields in Nansha areas are statistically analyzed in this article. The wind-wave growth relation is further studied and a wind-wave model suitable for the Nansha areas is established. The analysis of spatial and temporal distribution shows a good correspondence between monthly mean significant wave height (Hs) and wind field in the monsoon period. In the southeast of Indo-China Peninsula, there is a high value center of both wind speed and Hs. The center is stronger in winter than that in summer, and the location moves slightly down the wind along with seasonal transition. The frequency analysis shows that wind below category 4 and wave under class 3 occur most frequently in the Nansha area. The wind force scale above category 6 and waves above class 5 mainly appear in winter. The maximum wind speed and wave height in the whole year appears in October and November with the maximum wind speed up to category 8 and the maximum Hs up to class 6, although the probability is extremely low. The minimum wind speed and wave height appears in April and May.