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Modeling the impact of dam removal on channel evolution and sediment delivery in a multiple dam setting

International Journal of Sediment Research 2019年第6期34卷 537-549页

作者： R.E.Poeppl T.Coulthard S.D.Keesstra M.Keiler Department of Geography and Regional Research University of Vienna School of Environmental Sciences University of Hull Wageningen Environmental Research Team SoilWater and Land Use 4. University of BernInstitute of Geography

Dam removal can generate geomorphic disturbances,including channel bed and bank erosion and associated abrupt/pulsed release and downstream transfer of reservoir sediment,but the type and rate of geomorphic response often are hard to *** situation gets even more complex in systems which have been impacted by multiple dams and a long and complex engineering *** previous studies one-dimensional(1-D) models were used to predict aspects of post-removal channel ***,these models do not consider two-dimensional(2-D) effects of dam removal such as bank erosion processes and lateral *** the current study the impacts of multiple dams and their removal on channel evolution and sediment delivery were modeled by using a 2-D landscape evolution model(CAESAR-Lisflood) focusing on the following aspects:patterns,rates,and processes of geomorphic change and associated sediment delivery on annual to decadal *** current modeling study revealed that geomorphic response to dam removal(i.e.,channel evolution and associated rates of sediment delivery) in multiple dam settings is variable and complex in space and *** in geomorphic system response is related to differences in dam size,the proximity of upstream dams,related buffering effects and associated rates of upstream sediment supply,and emerging feedback processes as well as to the presence of channel stabilization *** types and rates of geomorphic adjustment,using the 2-D landscape evolution model CAESAR-Lisflood,are similar to those reported in previous ***,the use of a 2-D method showed some advantages compared to1-D models,generating spatially varying patterns of erosion and deposition before and after dam removal that provide morphologies that are more readily comparable to field data as well as features like the lateral re-working of past reservoir deposits which further enables the maintenance of sediment delivery downstream.

关键词： reservoir and river management Landscape evolution modeling Sediment pulses river engineering Legacy effects Complexity

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