南海台风特征及台风场数值改进研究

Typhoon characteristics and numerical improvement of typhoon field of the South China Sea

通过搜集南海台风资料,对近10 a南海台风的规律进行了总结。利用Ueno台风风场模型和改进的藤田公式,引入压差修正系数和后报风场数据,构建了1330和1409号台风风场,并应用测站观测资料对模拟数据进行对比与误差分析。结果表明:西北太平洋移入南海的热带气旋整体上比南海生成的热带气旋数量多、强度大;南海海域生成的登陆台风在我国登陆较少,多在越南登陆。改进的模型风场极值相对误差小;引入后报数据后,合成风场数据相关性更好,误差更小。

Based on the data collected from the South China Sea, the regularity of the typhoon in the past ten years was summarized. Wind fields of typhoon 1330 and 1409 were reconstructed by using Ueno typhoon wind field model and the improved Fujita formula. The correction coefficient of pressure difference and the hindcast wind data were introduced. By comparing and evaluating simulation results with observation data of survey stations, the main conclusions are as follows： The amount of typhoon from the Northwest Pacific is large and the wind speed is much higher. The landing times of landfall typhoon from the South China Sea in Vietnam are more than in our country. The extreme relative error of the improved simulated typhoon is lower. After the introduction of hindcast data, syn- thetic wind field data has better correlation and less error.