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Predictive techniques for river channel evolution and maintenance

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Abstract

Predicting changes in alluvial channel morphology associated with anthropogenic and natural changes in flow and/or sediment supply is a critical part of the management of riverine systems. Over the past few years, advances in the understanding of the physics of sediment transport in conjunction with rapidly increasing capabilities in computational fluid dynamics, have yielded new approaches to problems in river mechanics. Techniques appropriate for length scales ranging from reaches to bars and bedforms are described here. Examples of the use of these computational approaches are discussed for three cases: (1) the design of diversion scenarios that maintain channel morphology in steep cobble-bedded channels in Colorado, (2) determination of channel maintenance flows for the preservation of channel islands in the Snake River in Idaho, and (3) prediction of the temporal evolution of deposits in lateral separation zones for future assessment of the impacts of various dam release scenarios on lateral separation deposits in the Colorado River in Grand Canyon. With continued development of their scientific and technical components, the methodologies described here can provide powerful tools for the management of river environments in the future.

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  1. U.S. Geological Survey, Water Resources Division-National Research Program, Box 25046, 80225, Lakewood, Colorado

    J. M. Nelson

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  1. J. M. Nelson
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Nelson, J.M. Predictive techniques for river channel evolution and maintenance. Water Air Soil Pollut 90, 321–333 (1996). https://doi.org/10.1007/BF00619292

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  • DOI: https://doi.org/10.1007/BF00619292

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