Abstract
This study investigates community-based landslide mitigation planning. The combination of a landslide susceptibility index (LSI) model, landslide inventory datasets, and field work is used to identify hazard-prone areas in Maolin District, Taiwan. Furthermore, to identify the challenges and opportunities affecting the sustainable development of mountain communities, a pilot survey was conducted in three such communities (Dona Village, Wanshan Village, and Maolin Village). The results reveal that there are two types of significant mass movement in such areas: debris avalanche and debris flow. The results also show that the LSI map and multi-temporal landslide inventory datasets correlate with landslide locations. Meander is identified as an important factor in landslide activity. The questionnaire results show that the residents of the study area lack awareness of and access to information related to landslide activity. Similarly, the local residents favor increased environmental protection, working within their community, and additional government spending in regard to managing geohazards. To increase the resilience of the community, an improved landslide susceptibility map is proposed based on the output of the results. Thus, this research improves upon the process of identifying, supporting, and bettering the management of communities prone to landslides.
Highlights
There are two categories of natural disasters that affect Taiwan: climatic-related disasters, such as typhoons and floods, and geological hazards, which include mass movements or slope failures and earthquakes
The questionnaire results show that there is a need to further develop the flow of information available to the local residents of Maolin District
This study revealed that the residents demonstrated a lack of faith in non-local nongovernmental organizations and government departments alike
Summary
There are two categories of natural disasters that affect Taiwan: climatic-related disasters, such as typhoons and floods, and geological hazards, which include mass movements or slope failures and earthquakes. The historical records reveal that from 1958 to 2007, 270 natural disaster events occurred in Taiwan, including typhoons (71.1%), flooding (15%), earthquakes (8.5%), torrential rainfall (2.2%), windstorms (1.5%), mountain flooding (0.7%), and landslides (0.7%) [1]. Typhoon-induced landslides pose the greatest threat to southern Taiwan [2]. Typhoons are common meteorological events during the summer and fall months in Taiwan. 30 tropical cyclones form annually, with an average of 4.5 events affecting Taiwan and an average of 1.8 making landfall [4]. Heavy rainfall persists even after a typhoon leaves Taiwan [7]. Typhoons often engage in tremendous changes in motion and structure when approaching or moving across an island [8,9], making their paths difficult to forecast
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