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How sediment composition and flow rate influence downstream channel morphodynamics upon dam removal
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2021-07-05 , DOI: 10.1002/esp.5187 Joanna Crowe Curran 1 , Kristen Cannatelli Coveleski 2
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2021-07-05 , DOI: 10.1002/esp.5187 Joanna Crowe Curran 1 , Kristen Cannatelli Coveleski 2
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The process of dam removal establishes the channel morphology that is later adjusted by high-flow events. Generalities about process responses have been hypothesized, but broad applicability and details remain a research need. We completed laboratory experiments focused on understanding how processes occurring immediately after a sediment release upon dam removal or failure affect the downstream channel bed. Flume experiments tested three sediment mixtures at high and low flow rates. We measured changes in impounded sediment volume, downstream bed surface, and rates of deposition and erosion as the downstream bed adjusted. Results quantified the process responses and connected changes in downstream channel morphology to sediment composition, temporal variability in impounded sediment erosion, and spatial and temporal rates of bedload transport.
中文翻译：
沉积物成分和流速如何影响大坝拆除后下游河道的形态动力学
大坝拆除过程建立了随后由高流量事件调整的渠道形态。已经假设了关于过程响应的一般性，但广泛的适用性和细节仍然是研究需要。我们完成了实验室实验，重点是了解大坝拆除或破坏后沉积物释放后立即发生的过程如何影响下游河床。水槽实验在高流速和低流速下测试了三种沉积物混合物。随着下游河床的调整，我们测量了蓄水沉积物体积、下游河床表面以及沉积和侵蚀速率的变化。结果量化了过程响应，并将下游河道形态的变化与沉积物成分、蓄水沉积物侵蚀的时间变异性以及底物运输的空间和时间速率相关联。
更新日期：2021-07-05
中文翻译：
沉积物成分和流速如何影响大坝拆除后下游河道的形态动力学
大坝拆除过程建立了随后由高流量事件调整的渠道形态。已经假设了关于过程响应的一般性，但广泛的适用性和细节仍然是研究需要。我们完成了实验室实验，重点是了解大坝拆除或破坏后沉积物释放后立即发生的过程如何影响下游河床。水槽实验在高流速和低流速下测试了三种沉积物混合物。随着下游河床的调整，我们测量了蓄水沉积物体积、下游河床表面以及沉积和侵蚀速率的变化。结果量化了过程响应，并将下游河道形态的变化与沉积物成分、蓄水沉积物侵蚀的时间变异性以及底物运输的空间和时间速率相关联。
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