珠江口附近海域波浪场的数值计算与特征分析

本文以WRF模式输出结果作为风场驱动条件,采用SWAN和WAVEWATCHIII相嵌套的方法,对珠江口附近海域进行20年(1991-2010年)的波浪场数值计算。根据计算结果,分析了珠江口海域波高和周期的空间、时间变化特征。结果显示:珠江入海口及近岸Hs较小,外海Hs较大,大部分海域年均Hs在0.4m以上;珠江口附近海域和近海地区年均Te偏小,在2s^3s之间,外海最大可达5s。珠江海域有效波高(Hs)的季节分布呈现出春夏季较小,秋冬季较大的特点。从概率学角度分别统计20年中前5%和10%的Hs及Te,可知:珠江口近海区域Hs,5%在1~2m,大万山群岛处可达Hs,5%2m;在珠江口附近Hs,10%为1.5m,万山海域Hs,10%在2.5m以上;计算海域Te,5%和Te,10%多在4s以上。

Numerical Calculation and Characteristic Analysis of Wave Ffield in the Sea Area Near the Pearl River Estuary

In this paper, the output of WRF model is used as the driving condition of wind field. The SWAN and WAVE WATCH Ⅲ nested wave modes are used to calculate the wave field of the sea near Pearl River Estuary for a total of 20 years (1991--2010). According to the calculation results, In this paper, we analyzed the spatial and seasonal variation characteristics of wave height and periodn the Pearl River Estuary, The results showed that the Hs of the Pearl River estuary and its nearshore are small, and the Hs of the offshore is relatively large, with an annual average Hs of over 0. 4m in most areas. The annual average Te in the sea area near the Pearl River estuary and the offshore area is small, between 2 s and 3 s, and the Te of the outer sea is 5 s. The seasonal distribution of significant wave height ( Hs) in the Pearl River Sea area is smaller in spring and summer and larger in autumn and winter. From the perspective of probability, statistics of the 5% and 10% of Hs and Te in 20 years indicate that Hs,5% is between 1 and 2min the coastal area of the pearl river estuary, and Dawanshan islands can reach 2m;Hs,10% is 1. 5min the coastal area of the pearl river estuary, and Hs,10% is more than 2. 5minthe sea area of wanshan. Te, 5% and Te, 10% are more than 4s in the sea.