| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 98 === Taiwan is located at the center of Circumpacific belt. Many faults and the fracture of geological conditions are need considering due to the Philippine Sea and the Eurasia plate action. When the typhoon season coming during June to Oct., the rainfall intensity is plentiful to concentrate and could be caused the different slope hazards. Practically, the hazard of debris flow will cause large range damages and impact at short duration.
In recent years, due to climate changing, the frequency of extreme climate condition is double. To order to find out the relationship between extreme climate induce rainfall intensity and influence zone of debris flow, the program of FLO-2D is adopted to simulate the two-dimensional floods, and the influence zone and accumulation depth of debris flows.
The study areas are five potential debris flow torrent, which located at Chen-Yu-Lan River in Nantou County. The rainfall data of Typhoon Mindulle, Toraji and Morakot are collected. All of these typhoons caused many times of debris flow and serious disaster. From the analysis of the properties of rainfall, we can indicate the main reason of Toraji typhoon induce-damage is highly rainfall intensity large than 100mm per hour. And Mindulle typhoon and Morakot typhoon induce damage are caused by huge accumulated rainfall. From the results with rainfall properties and watershed area, it could find the influence area and accumulation depth of debris flow are much correlated with rainfall intensity and watershed area. It also can find that the rainfall intensity effect is indistinct to a large watershed area.
|
|---|
