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Dynamic Modeling of Sediment Production and Transport at Watershed Level
Landslides;Soil erosion;Sediment transport;Shihmen Reservoir watershed
|Issue Date: ||2015-04-29T04:12:13Z
Sediment production and transport triggered by typhoon precipitation are critical issues in Taiwan. These natural phenomena usually cause direct damages on the human's life and properties and change river bedform threaten the hydraulic and water resources facilities. To evaluate the dynamic of sediment production and transport triggered, an integrated model was developed which couples landslide susceptibility, sediment production from landslides and soil erosion, and sediment transport models. The model first used soil water index from tank model as a triggering factor of logistic regression to model the landslide susceptibility.
Second, sediment production from landslides was simulated based on the landslide susceptibility and an empirical relation of landslide volume-area, and the Universal Soil Loss Equation was used to calculate the soil erosion rate. Third, the sediment transports induced by the forces of water and gravity was simulated based on the runoff from tank model and Hunt's model. Then, the model was applied and tested in the Shihmen Reservoir watershed. The results show acceptable performances in predicting the landslide susceptibility (AUC = 0.74~0.79), runoff (coefficient of efficiency = 0.82), and sediment discharge. Under an extreme rainfall scenario, landslides are the major source of sediment resulting approximately 2~5 m of sediment accumulation occurred on the upstream. The test confirmed that the model is capable of modeling the dynamic of sediment production and transport at watershed level and providing the useful information for evaluating the sedimentation in reservoir and river.
|Appears in Collections:||[地理學系] 會議論文|
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