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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Mobile bed simulations on river scouring and deposition - a case study of dajia river, taiwan
Mobile bed simulations on river scouring and deposition - a case study of dajia river, taiwan
Author : SHIH DONG-SIN(1), LIAO YUAN-YA(2)
ABSTRACT
This research is focused on the process of local scouring and its deposition of river bed during the flash flood in Dajia
River, Taiwan. The Dajia River is selected to study since it is labeled as one of most severe river in Taiwan due to its
varied morphology. The river has not only steep slope, but fragile bed with heterogeneous gravels along the river. In order
to better understand its local scoring process, we combined mobile bed simulation model and local field investigations to
study its temporal variability of river bed during flood. We first established a mobile river modeling system and calibrate
simulations via experimental data. The system was tested on the circumstances of river scouring and deposition. It
revealed a reasonable result on model calibration. And our simulation system is further modeled using extreme typhoon
events. Two extreme cases were implemented to evaluate model performance with checking observed river stages and
bed variations. The results revealed that our modeling system can fairly match the pattern of selected flash flood. This
established mobile bed system was then applied to simulate the circumstances of different return periods of discharges
and the scenarios of remove dams on channel. It shows that the local scours on some cross sections are extreme deep.
As compared the modeling results to the reality, it implies that the selected sediment formula and river deposition
mechanism may be further modified. In order to address above problem, we propose a method to combine the mobile bed
simulations and field measurements to reconstruct the temporal variability of local scoring and bed deposition. The
simulation shows that proposed approach can reasonably catch changeable river bed on Dajia River for extreme event.
File Size : 1,238,078 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 28/08/2015
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