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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Bed waves at the basin scale: implications for river management and restoration
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Bed waves at the basin scale: implications for river management and restoration

机译：流域规模的基波：对河流管理和恢复的影响

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An extensive literature about fluvial sediment waves, slugs or pulses has emerged in the past 20 years. The concept has been useful in many respects, but has been applied to diverse phenomena using a variety of definitions. Moreover, inferred linkages between channel-bed changes and sediment loads are often not justifiable. This paper reviews concepts of large fluvial sediment waves at scales extending to several tens of kilometres. It points out constraints on the inferences that can be made about sediment loads based on changes in channel-bed elevation at this scale where channel sediment interacts with storage in floodplain and terrace deposits. The type area of G. K. Gilbert's initial sediment-wave concept is re-examined to show that neither wave translation nor dispersion occurred in the simple manner commonly assumed. Channel aggradation and return to graded conditions provide an alternative theory explaining Gilbert's observed bed-elevation changes. Recognizing the evidence and implications of the former passage of a large-scale bed wave is essential to the accurate diagnosis of catchment conditions and the adoption of appropriate river restoration goals or methods. Sediment loads, water quality, channel morphologic stability and aquatic ecosystems often reflect changes in sediment storage long after the channel bed has returned to grade. Copyright (c) 2006 John Wiley & Sons, Ltd.
机译：在过去的20年中，涌现出大量有关河流沉积物波，或脉动的文献。该概念在许多方面都很有用，但已使用各种定义将其应用于各种现象。而且，推断河床变化与沉积物负荷之间的联系通常是不合理的。本文回顾了大型河流沉积物波的概念，其规模可扩展到几十公里。它指出了在基于该规模的河床高度变化的基础上可以对泥沙负荷进行推断的约束条件，在该尺度上，河床沉积物与洪泛区和阶地沉积物的存储相互作用。重新检查了吉尔伯特（G. K. Gilbert）最初的泥沙波概念的类型区域，以显示波平移和弥散都不会以通常假定的简单方式发生。渠道凝结和恢复坡度条件提供了另一种理论，解释了吉尔伯特观察到的床高变化。认识到以前大规模流床通过的证据和意义对于准确诊断集水条件和采用适当的河流恢复目标或方法至关重要。在河床层恢复坡度很久之后，沉积物负荷，水质，河道形态稳定性和水生生态系统通常反映了沉积物储量的变化。版权所有（c）2006 John Wiley＆Sons，Ltd.

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