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Typhoon Morakot;Landslides;Soil erosion;Sediment discharge
|Issue Date: ||2015-04-29T04:09:49Z
Due to the fragile geological conditions of watersheds in Taiwan, heavy torrential rains induced by typhoons often inflict natural disasters such as landslides and debris flow. Meanwhile, the deposited sediment in the river channel may induce large damages in the next typhoon-induced flood. As a result, it is vital to reasonably estimate the sediment discharge for sediment simulation. This study focused on Linpian Creek Watershed. First, the areas of landslides are indentified by using the satellite images and the depths of landslides are estimated by empirical equations. The soil erosion on the hillsides is also estimated. The sediment discharge from landslides and soil erosion is then estimated by the delivery rate multiplying the volume of sediment of landslides and soil erosion. The above mentioned sediment discharge is treated as lateral sediment discharge. The sediment discharge of Hsinpei Station and sediment transport simulations are performed by the HEC-RAS. The results are compared with that estimated by the rating curve of discharge and suspended load of Hsinpei Station accompanying empirical relations.
|Appears in Collections:||[地理學系] 會議論文|
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