Derivation of Typhoons Accumulated Rainfall Distribution in Taiwan Area by Using SSM/I Data
Since multi-scale interactions with the typhoons development, movement, and structure, it is still an ongoing challenge to accurately predict its evolution. Taiwans Central Mountain Range (CMR) is extremely complex and unique, due to its steepness (an average elevation of 3000 m and a dimension of 300 km by 100 km) and near north-south orientation. The fact that Taiwan is surrounded by ocean and often situated in the path of typhoons makes more difficult to predict the significant mesoscale variations in the rainfall of typhoons. The Tropical Rainfall Potential (TRAP) technique is a simple concept that serves as a useful tool for forecasters in predicting the accumulated rainfall from typhoons. However, the original TRaP technique could only retrieve a graphical representation of the accumulated rainfall from typhoons for both oceans and fiat land areas. Taiwans CMR may influence the rainfall distribution during typhoon landfalls. This research seeks to propose an algorithm in improving the TRaPs accuracy in a typhoons accumulated rainfall pattern in Taiwan by using SSM/I data and the automatic rain gauge stations over Taiwan. After considering Taiwans terrain effect, the results in this study shows that the accuracy in a typhoons accumulated rainfall estimation in Taiwan is seen to further improve. However, it is believed further improvements can still be achieved in future studies. This includes collecting more typhoon cases and producing an even more comprehensive typhoon categorization by taking into account more typhoon tracks, along with the radius size and wind speed. In addition, the change in the typhoons structure and shape should also be considered during the TRaP calculation.
tropical rainfall potential technique accumulated rainfall Taiwans terrain
Chung-Chih Liu Sung-Ching Chi Hsin-Chia Yang
Minghsin University of Science and Technology, Hsin-Chu 30401, Taiwan, China
国际会议
2009 International Conference on Earth Science and Technology(2009地球科学与技术国际学术讨论会)
北京
英文
70-73
2009-05-14（万方平台首次上网日期，不代表论文的发表时间）