Topographic correction for the initial rainfall factor for landslide prediction

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publication29th Asian Conference on Remote Sensing 2008, ACRS 2008
Pages705-709
Number of pages5
StatePublished - 1 Dec 2008
Event29th Asian Conference on Remote Sensing 2008, ACRS 2008 - Colombo, Sri Lanka
Duration: 10 Nov 200814 Nov 2008

Publication series

Name29th Asian Conference on Remote Sensing 2008, ACRS 2008
Volume2

Conference

Conference29th Asian Conference on Remote Sensing 2008, ACRS 2008
CountrySri Lanka
CityColombo
Period10/11/0814/11/08

Keywords

  • Geohazards
  • Landslide Susceptibility
  • Remote sensing
  • Typhoon Mindulle

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  • Cite this

    Liu, J. K., Liao, Z. Y., & Shih, T-Y. (2008). Topographic correction for the initial rainfall factor for landslide prediction. In 29th Asian Conference on Remote Sensing 2008, ACRS 2008 (pp. 705-709). (29th Asian Conference on Remote Sensing 2008, ACRS 2008; Vol. 2).