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標題: The Rain Gauge Planning for Debris Flow Monitoring Using Spatial Statistics and Weight Factor Method
作者: 洪勝雄
Sheng-Hsiung Hung
Shin-Ping Lee
Hui-Chung Yeh
Yi-Chu Su
關鍵字: 土石流;克利金法;雨量站網評估;Debris flow;Kriging;Rain gauge network
Project: 水土保持學報, Volume 47, Issue 3, Page(s) 1465-1486.


Due to the geographical environment conditions, Taiwan frequently suffers from severe typhoons and rainfall events. These events cause not only flooding disasters in the plain area but also the debris flow disasters in mount ainous areas. Climate change further changes the rainfall patterns. Therefore, a reliable rainfall gauge observation network is important to support disaster prevention works. This study researches on improving rainfall gauge observation network. An experimental semi-variogram is used to fit different types of theoretical variogram models using collected rainfall data of typhoon and rainfall events from 1998 to 2013 in Taipei area. The appropriate theoretical variogram model is determined with the KAE and KRMSE methods. The analysis result shows that the observation range of rain gauge is about 5 km. Through the foregoing results and reviewing the number of rain gauges in Taipei area. After generating 5 by 5 km grids for Taipei area, we found 38 grids which have potential debris flow risk but lack of rain gauges. In order to assess the priority of rain gauges establishment, this research applies the sequential algorithm with the spatial property and weighting factors to evaluate the benefits for each potential new rain gauges. Kriging variance and spatial analysis are adopted for this assessment. After assessment, the distance between the potential debris flow area and rain gauge nearby can be less than 5 km. Furthermore, the results show that the value of kriging variance will decrease and also have better benefits when 10 rain gauges are established.
Appears in Collections:第47卷 第03期

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