摘要
利用一个三重水平结构、双向嵌套的台风数值模式，以１９９２年８月２９日１２时为初始场，根据模式中地形插值时遇到的问题，设计了实际海岸线与扩展海岸线两种方案，对９２１６号登陆台风及其暴雨进行了对比模拟试验。结果表明：地形动力抬升形成的对流降水是台风暴雨增幅的一个重要原因。暴雨中心随海岸线的扩展而移动，可发生在“扩展陆地”上。较低的地形扩展对台风路径的影响甚微，但对台风强度及偏东急流有一定的影响；由于地形坡度削弱会引起地形性降水减少，从而使台风暴雨幅度有所减弱，因此，在模式中需要对地形进行慎重的处理。
By employing a numerical typhoon model with a horizontally three layer overlapped and two way nested structure, two numerical experiments with true sealine and with extended sealine in the southeast of China have been carried out to investigate the effect of distribution of the sealine on the amplifying of the torrential rain of the landing tyhoon 9216. The results show that the convective precipitation caused by the dynamic lifting of the orography plays an important role in the amplifying of the rainstorm of the landing typhoon. The centre of the rainstorm moves with the extended sealine and the rainstorm can occur on the extended land. The lower extention of the sealine has little effect on the path of typhoon but has some effects on the intensity and the easterly jet of typhoon. The amplitude of the rainstorm weakens due to the decreasing of the orographic precipitation resulted from the weakening of the orographic acclivity. Therefore, the dealing of the orography in the model must be careful considering the probable amplifying of the rainstorm of typhoon caused by the small modification of the orography.
出处
《热带气象学报》
CSCD
1996年第4期304-313,共10页
Journal of Tropical Meteorology
关键词
海岸线分布
台风
暴雨
增幅
数值研究
Distribution of the sealine The torrential rain of typhoon Amplify
