Browsing by Author "Lo, Wen-Chun"

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Applying GIS and Remote Sensing to Simply Estimate Landslide Volume of Typhoon Events in a Watershed
(2011-01-01)
Lin, Bor-Shiun
;
Leung, Wai-Yi
;
Chi, Shu-Yeong
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Lo, Wen-Chun
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交大名義發表
Landslide volume induced by typhoons is prone to be estimated by empirical formula. Its advantage is only needed fewer parameters and simpler assumption. The input parameters can be obtained from field surveys or remote sensing interpretation on GIS platform that would help engineers with practical design and implement emergency action when encountering geohazards. Therefore, this study aimed to develop typical, reliable, and simple empirical formula to estimate landslide volume from typhoon events in a watershed. Collection of complete landslide inventory and precise precipitation is a priority task. Based on the above, rational studies can be conducted for reduce risk of sediment disaster and implementation on of soil and water conservation works.
Building vulnerability to debris flows in Taiwan: a preliminary study
(2012-12-01)
Lo, Wen-Chun
;
Tsao, Ting-Chi
;
Hsu, Chih-Hao
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土木工程學系
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Department of Civil Engineering
In quantitative risk analyses for natural hazards, vulnerability can be expressed as the ratio of reconstruction, replacement or reproduction expenses due to a damage caused by a certain process intensity and the original value of the element at risk exposed. To discuss the building vulnerability under debris flow events, the ratio is mostly related to debris flow inundation height, building materials and building values. Different types of buildings would resist to the impact of debris flows differently, resulting in different damage levels even under the same inundation height. After debris flow events, the damages to a building include the content loss and the structure loss, which is also variable due to the individual building conditions. This study proposes a flowchart to establish building vulnerability curves through estimating the damages to buildings after debris flow hazards. The losses of content and structure are firstly calculated separately to obtain the loss ratios with respect to original buildings. Secondly, by combining the content and structure loss ratio, the building vulnerability function is derived. In this paper, the original building content value was obtained from governmental statistic records and was based on the market price, and the structure value was received from a regional architecture office. The losses resulting from debris flow impacts were synthetically derived following field surveys. To combine the content and structure losses, a unit building with a floor area of 60 m(2) was assumed. The result shows that due to a higher percentage of content value compared with the total building value, the loss ratio resulting from debris flows in Taiwan is higher compared with European studies, in particular with respect to high-frequency but low-magnitude events. The concept of obtaining building vulnerability is particularly suitable for regions where well-documented building loss records are unavailable.