The Study on Sediment Budget and Delivery Ratio In the Shihmen Reservoir Watershed
Date Issued
2010
Date
2010
Author(s)
Lin, Chien-Hung
Abstract
Sedimentation is a big problem in the reservoir in Taiwan. Most of sediment source can apart from soil erosion and landslide which bring into river during typhoon events. In recent years, frequently extreme hydrological events were observed in Taiwan corresponding with the effect of global climate change. The rainfall characteristics and pattern were also temporally variant. In the past, lots of studies used a geologic regression to stand for each watershed’s capacity to show the characteristic of sediment transport. However, long-term average result can’t apply in watershed management. We select Shihmen reservoir as an example. Through the concept of sediment budget, we confer sediment delivery ratio in different time and spatial scale. This study calculate sediment budget and delivery ratio from 2004 to
2008.
There are 6,228 tons sediments from landslide after Alle typhoon in 2004. The sediment source from landslide is 56% and soil erosion is 44%. There are lots of sediment deposited in the slope and river bed, it might raise the risk of disaster.
To simulate the output sediment from each watershed, we choose HSPF model to simulate during 2004 to 2008. In this case, we find sediment delivery ratio changing base on annual hourly-maximum rain intensity. Sediment delivery ratio in the Shihmen reservoir is between 1% to 40%. To application in watershed management, we try to regress sediment delivery ratio and rain intensity in the power rule. Base on the result we can represent each watershed’s sediment transport behavior to support
decision makers to make strategies.
Subjects
landslide
soil erosion
delivery ratio
sediment budget
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-99-R97521325-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):a241c9a59ed01c95a3cec37c73381373