落石灾害防治——以台湾屏东县来义村为例

Rockfall Hazard Prevention in Laiyi Vllage of Pingdong County,Taiwan

本文使用科罗拉多落石仿真程序(CRSP),判断来义村遭受到落石冲撞的危险性,并依据2005～2010年来义村集水区所发生的天然灾害事件,探讨日雨量与降雨强度等水文资料与灾害发生之间的关系,最后根据现场土壤采样,使用统一土壤分类法判断当地土砂是否适宜用于工程建造;从落石仿真程序的仿真结果,可以得知来义村上边坡处落石的发生机率相当高,需在边坡设置防护设施保护村落安全;根据土壤分析结果,来义村的周遭河床底质属于优良级配的含砂砾石,可就地取材,配合防灾工程的实施,由水文分析得知,降雨强度为诱发来义村集水区发生灾害与否的主要因素。

By using Colorado Rockfall Simulation Program （CRSP）, it is determined the villages suffered the risk of rockfall hazard and discussed the relationships between hydrological data （ daily rainfall and rainfall intensity） in ac- cordance with the natural disaster~ events from 2005 to 2010. Finally, based on the results of soil field sampling soil, by using the united soil classification method, it is determined whether or not the local materials can be offering for the disaster prevention works. Form the simulation results, it is learned that probability of rockfall at the slope of Laiyi Vil- lage is high that it is necessary to set up the facilities to protect the village. In accordance with the soil analysis result, the silt content gravel on the riverbed around the Laiyi Village belongs to the excellent grade, that is suitable to be used for the construction of the disaster prevention project. From the hydrological analysis, it is recognized the rainfall inten- sity is the key factors for disaster in this area.