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The Processes Surrounding Channel Evolution following a Partial Dam Removal on the Coastal Plain of Virginia

机译:弗吉尼亚沿海平原局部坝拆除后围绕通道演变的过程

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The physical changes to a newly forming river in a slow draining reservoir following partial dam removal are the focus of this investigation. Past research on the effects of dam removal have focused on changes to the morphology of the downstream channel. This research evaluates the independent parameters controlling channel evolution in the draining reservoir. This research uses a case study to determine the controlling parameters in the channel evolution post dam removal and to develop a conceptual model that is applicable to draining reservoirs on the coastal plain where there is high cohesive sediment content. A partial dam breach on a tributary of the James River (VA) has led to slow draining of the reservoir. Data collection included suspended and bedload sediment, discharge rates, bank material samples, and cross sections at twenty-meter increments every four months for two years. A complete documentation of channel adjustments was performed, including the identification and classification of forms and processes observed and the quantification of the dominant processes of channel formation. Data from the study site is to test the accuracy of current methods of predicting channel behavior following a dam break and to develop a conceptual model describing channel formation in draining reservoirs in the coastal plain.
机译:在局部坝拆除后缓慢排放水库的新成型河流的物理变化是这项调查的重点。过去对坝移除效应的研究重点是对下游通道形态的变化。该研究评估了排水储层中控制渠道演进的独立参数。该研究使用案例研究来确定渠道演进后坝拆除的控制参数,并开发概念模型,适用于沿海平原上的排水水库,在那里存在高粘性沉积物含量。詹姆斯河(VA)支流上的部分坝违约导致水库减缓了排水。数据收集包括暂停和床单沉积物,排放率,银行材料样品,并每四个月以二十米的增量横截面两年。进行了完整的渠道调整文件,包括观察到的形式和过程的鉴定和分类以及渠道形成的主要过程的定量。研究现场的数据是测试在大坝休息后预测通道行为的当前方法的准确性,并开发描述沿海平原排放水库中的渠道形成的概念模型。

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