Removal processes of riparian vegetation in gravel bed-braided river
Riparian vegetation removal processes in a gravel bed-braided river
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The gravel bed-braided Tenryu River has been selected to understand the interaction between vegetation removal, hydrodynamic parameter and river morphology. Long term trend of vegetation dynamics performed using satellite image and relate those vegetation change with a series of annual maximum flood flow. Less vegetation invasion has been observed before dam construction when peak flood flow occurred. Then, a 2D flood numerical analysis is performed to quantify the parameter responsible for vegetation removal. Bed shear stress and drag moment found suitable to remove plant vegetation within th...
The gravel bed-braided Tenryu River has been selected to understand the interaction between vegetation removal, hydrodynamic parameter and river morphology. Long term trend of vegetation dynamics performed using satellite image and relate those vegetation change with a series of annual maximum flood flow. Less vegetation invasion has been observed before dam construction when peak flood flow occurred. Then, a 2D flood numerical analysis is performed to quantify the parameter responsible for vegetation removal. Bed shear stress and drag moment found suitable to remove plant vegetation within threshold value. The process then further progressed to validate this parameter in a spatial scale. Validation of various years has reported fairly good agreement but still some misjudgments exist. Possible causes of misjudgment hypothesized as absence of sediment transport process in the numerical simulation and some river management activities done by River managers. Then, the effect of sediment transport process on vegetation removal has been observed. The numerical analysis can simulate 86% of total vegetation removal in comparison with aerial photograph analysis.
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