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|Title: ||石門水庫集水區颱風事件下之山崩、土壤沖蝕及泥沙遞移特性;Landslide, soil erosion and sediment delivery under different typhoon events in the Shihmen reservoir catchment basin|
|Authors: ||吳沛恩;Wu, Pei-En|
|Issue Date: ||2018-08-31 15:05:56 (UTC+8)|
;In order to evaluate the impact of landslide on downstream sediment transport, this study takes the Shimen Reservoir catchment area as the study area. I estimates the amount of landslide from landslide inventories of several typhoon events in the past years. I also estimates the total sediment load of each year and several typhoon events by the sediment content which recorded by the downstream hydrological stations. Two of these were quantified and compared to each other to understand the contribution of landslide to downstream sediment transport.
In this study, the suspended load was continuously observed and recorded during the typhoon. Compared with other studies, which used the methods of rating curve or the numerical hydraulic model, this study get better results in estimating total sediment load. After calculation and analysis, it is found that there is a good linear relationship between the amount of suspended load during typhoon and the amount of typhoon induced landslide .
Sediment transport has variability in time and space. During the time scale of a year and a typhoon, through the data of the eight years after typhoon Aere, it is found that the amount of sediments in the downstream Shimen reservoir generally greater than the upstream landslide amount. It shows that there is sufficient source of sediments upstream, which include not only the landslide occurred in the year but also the sediment deposited on the hill slope and riverbed. From 2004 to 2015, total sediment yield of the catchment is very close to total sediment discharge at the time scale of 12 years. It is inferred that the sediment products at first three years continuously provided sediments to the downstream. So that even typhoon event induced few of landslide, there is still a lot of sediment in the downstream.
|Appears in Collections:||[應用地質研究所] 博碩士論文|
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