Topographic correction for the initial rainfall factor for landslide prediction

Jin King Liu*, Zu Yi Liao, Tian-Yuan Shih

*此作品的通信作者

研究成果: Conference contribution同行評審

摘要

Usually, rainfall intensity of a location is interpolated by the rainfalls of weather stations in the neighborhood, not taking topographic effect into account. In this paper, a new method named as rainfall-vector projection is proposed for making the topographic correction. A rainfall vector is composed of a wind speed vector and a terminal velocity of rain drops. The projection of rainfall vector onto the ground surface is the amount for topographic correction. Wind speed vector can be deduced from wind records of standard weather stations. Terminal velocity of rain drops can be obtained by either its relationship to rain drop distribution recorded by disdrometer or on basis of an inference of the specific rainfall pattern of the dedicated rainfall event. Subsequently, a digital terrain model is employed for computing each grid cell of the projected amount of rainfall-vectors. The original rainfall distribution in the area is then adjusted by this correction. A study site in Central Taiwan is selected for demonstrating the topographic correction. The significance of this correction can be concluded by the correction amount of up to 11% of the original rainfalls.

原文English
主出版物標題29th Asian Conference on Remote Sensing 2008, ACRS 2008
頁面705-709
頁數5
出版狀態Published - 11月 2008
事件29th Asian Conference on Remote Sensing 2008, ACRS 2008 - Colombo, Sri Lanka
持續時間: 10 11月 200814 11月 2008

出版系列

名字29th Asian Conference on Remote Sensing 2008, ACRS 2008
2

Conference

Conference29th Asian Conference on Remote Sensing 2008, ACRS 2008
國家/地區Sri Lanka
城市Colombo
期間10/11/0814/11/08

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