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Sediment transport distribution along developing sand dunes

机译：沉积物运输分布沿着开发沙丘

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Dunes are the most common bed forms in lowland river channels consisting of sand and gravel, generated by divergences and convergences of sediment over the bed. They act as roughness to the flow leading to increasing water levels. To be able to model dune evolution and dune dimensions adequately, knowledge on flow and sediment transport processes are crucial. Sediment is transported as bed load and suspended load, of which a part can be wash load. Wash load is fine sediment that is transported in permanent suspension and therefore less important for morphological development of bed forms. Despite the dominance of suspended load in sand bed rivers (Kostaschuk et al., 2009), it is often assumed that bed load is the dominant transport mechanism in generating and migrating dunes. Suspended load is then neglected in modeling dune morphology and evolution for flood management purposes (Jerolmack et al., 2005; Paarlberg et al., 2009). However, several theoretical as well as field studies have shown significant difference in dune mechanisms under bed load and suspended load dominant transport regimes.
机译：DUNES是由砂和砾石组成的低地河流渠道中最常见的床形式，由床上的沉积物分歧和沉积物的收敛产生。它们充当流量的粗糙度，导致水平增加。为了能够充分模拟Dune Evolution和Dune尺寸，有关流动和沉积物运输过程的知识至关重要。沉积物作为床载荷和悬浮载荷，其中一部分可以是洗涤载荷。洗涤载荷是在永久悬浮液中运输的细沉积物，因此对床形式的形态学发育不太重要。尽管砂床河流悬浮载荷的主导地位（Kostaschuk等，2009），但常常认为床载是产生和迁移沙丘的主导运输机制。然后忽略了悬浮的载荷，在模拟DONE形态和洪水管理目的演变中（Jerolmack等，2005; Paarlberg等，2009）。然而，若干理论和现场研究表明了床载荷下的沙丘机制和悬挂式主导运输制度的显着差异。

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