Reduced‐complexity flow routing models for sinuous single‐thread channels: intercomparison with a physically‐based shallow‐water equation model
Reduced‐complexity flow routing models for sinuous single‐thread channels: intercomparison with a physically‐based shallow‐water equation model
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蜿蜒单线程通道的降低复杂性的流路模型：与基于物理的浅水方程模型的相互比较
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发表时间：
2009
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通讯作者：
A. Nicholas
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作者：
A. Nicholas
简化的河流过程模型使用简单的规则，忽略了许多潜在的控制物理。这种方法是合理的潜力，使用这些模型来调查长期和/或基本的河流行为。然而，很少有人注意到简化过程参数化的有效性或现实性，尽管这些方法中固有的假设可能会限制阐明天然河流行为的潜力。这项研究提出了两个新的降低复杂性的流量路由计划，专门为应用在单线河流。将两种方案的输出与求解深度平均浅水方程的更复杂模型的输出进行比较。这种比较首次证明了使用简单的流量路由方案推导河道内流深、单位流量、能量斜率和单位水流功率的现实预测的潜力。它还强调了模拟单位流功率，剪切应力或泥沙输运能力作为当地河床坡度的函数的不足之处，这是以前许多降低复杂性模型的常见做法。版权所有© 2009约翰威利父子有限公司。
Reduced‐complexity models of fluvial processes use simple rules that neglect much of the underlying governing physics. This approach is justified by the potential to use these models to investigate long‐term and/or fundamental river behaviour. However, little attention has been given to the validity or realism of reduced‐complexity process parameterizations, despite the fact that the assumptions inherent in these approaches may limit the potential for elucidating the behaviour of natural rivers. This study presents two new reduced‐complexity flow routing schemes developed specifically for application in single‐thread rivers. Output from both schemes is compared with that from a more sophisticated model that solves the depth‐averaged shallow water equations. This comparison provides the first demonstration of the potential for deriving realistic predictions of in‐channel flow depth, unit discharge, energy slope and unit stream power using simple flow routing schemes. It also highlights the inadequacy of modelling unit stream power, shear stress or sediment transport capacity as a function of local bed slope, as has been common practice in a number of previous reduced‐complexity models. Copyright © 2009 John Wiley & Sons, Ltd.