Disaster prevention of rockfall hazard risk at Laiyi Village, Pingtung County, Taiwan

In recent years, the world due to the impact of global warming, around the world have the case of extreme type of climate also led to mix the rainy season. Slope of the incidence of rockfall hazard was higher effect on the increasing rainfall duration and its intensity. Taiwan is located on the Pacific, and the young fragile geology, typhoon hit higher probability because the climatic characteristics of this island. Slope rockfall hazard not only harmful to people´s safety but also devastating for the crop damage. The Laiyi Village suffered a considerable extent in Morakot typhoon calamity on 2009 and the river and slope near The Laiyi Village were getting serious disaster in Fanapi typhoon calamity on 2010. Under the influence of the super typhoon, the village´s tourism and farming industries suffered severe shock. Due to the extreme rainfall by climate changes, looking many ways for reducing the damage caused by the slope disasters, increasing the safety of local residents and the local economy will be recovery rapidly. Rockfall disaster of slope was the most direct threat to the safety of life. So, if we estimate the path of falling rock stone for the various physical processes and in accordance with the investigations of river channel, we can proposed an effective way to control dangerous slope in the future. This paper is exploring the hydrological and geomorphologic factors, local capacity and analysis of physical and chemical properties for the sediment gradation of river bed by soil samples at the river channel and the resistance for landslide near collapse in the region to conduct field surveys, combined with the Colorado Rockfall Simulation Program(CRSP) to find out the countermeasurements for the hillslope engineering.