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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Developing a new stream metric for comparing stream function using a bank-floodplain sediment budget: A case study of three Piedmont streams
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Developing a new stream metric for comparing stream function using a bank-floodplain sediment budget: A case study of three Piedmont streams

机译：使用河滩漫滩沉积物预算开发一种新的河流度量标准以比较河流功能：以三个皮埃蒙特河流为例

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A bank and floodplain sediment budget was created for three Piedmont streams tributary to the Chesapeake Bay. The watersheds of each stream varied in land use from urban (Difficult Run) to urbanizing (Little Conestoga Creek) to agricultural (Linganore Creek). The purpose of the study was to determine the relation between geomorphic parameters and sediment dynamics and to develop a floodplain trapping metric for comparing streams with variable characteristics. Net site sediment budgets were best explained by gradient at Difficult Run, floodplain width at Little Conestoga Creek, and the relation of channel cross-sectional area to floodplain width at Linganore Creek. A correlation for all streams indicated that net site sediment budget was best explained by relative floodplain width (ratio of channel width to floodplain width). A new geomorphic metric, the floodplain trapping factor, was used to compare sediment budgets between streams with differing suspended sediment yields. Site sediment budgets were normalized by floodplain area and divided by the stream's sediment yield to provide a unitless measure of floodplain sediment trapping. A floodplain trapping factor represents the amount of upland sediment that a particular floodplain site can trap (e.g. a factor of 5 would indicate that a particular floodplain site traps the equivalent of 5 times that area in upland erosional source area). Using this factor we determined that Linganore Creek had the highest gross and net (floodplain deposition minus bank erosion) floodplain trapping factor (107 and 46, respectively) that Difficult Run the lowest gross floodplain trapping factor (29) and Little Conestoga Creek had the lowest net floodplain trapping factor (-14, indicating that study sites were net contributors to the suspended sediment load). The trapping factor is a robust metric for comparing three streams of varied watershed and geomorphic character, it promises to be a useful tool for future stream assessments.
机译：为切萨皮克湾的三个支流皮埃蒙特河建立了河岸和漫滩沉积物预算。每条河流的分水岭的土地利用情况各不相同，从城市（艰难行进）到城市化（小康涅斯托加河）再到农业（林加诺尔河）。这项研究的目的是确定地貌参数与沉积物动力学之间的关系，并建立洪泛区诱集指标，以比较具有可变特征的河流。可以通过以下方式来最好地解释站点的净沉积物预算：困难运行时的坡度，Little Conestoga Creek的漫滩宽度以及Linganore Creek的河道截面积与漫滩宽度的关系。所有河流的相关性表明，用相对洪泛区宽度（河道宽度与洪泛区宽度之比）可以最好地解释净沉积物收支平衡。一种新的地貌度量标准，洪泛区捕获因子，用于比较具有不同悬浮泥沙产量的河流之间的泥沙预算。用洪泛区面积对场地泥沙预算进行归一化，再除以河流的泥沙产量，以提供无单位的洪泛区泥沙捕获量度。洪泛区捕获因子表示特定洪泛区站点可以捕获的陆地沉积物的数量（例如，因子5表示特定洪泛区站点捕获的能量相当于高地侵蚀源区面积的5倍）。使用该因子，我们确定Linganore Creek的总洪涝和净洪灾（洪泛平原沉积量减去河岸侵蚀）最高（分别为107和46），Difficult Run的洪泛平原总捕获因子最低（29），Little Conestoga Creek最低洪泛区净捕获因子（-14，表明研究地点是悬浮泥沙负荷的净贡献者）。诱集因子是比较流域和地貌特征不同的三个流的可靠指标，它有望成为未来流评估的有用工具。

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