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DigitalCommons@USU
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Migrating bed forms strongly influence hydraulics, transport, and habitat in river environments. Their dynamics are exceedingly complex, making it difficult to predict their geometry and their interaction with sediment transport. Acoustic...
2011-01-01
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There has been a global, 30-year increase in surface mining (1), which is now the dominant driver of land-use change in the central Appalachian ecoregion of the United States (2). One major form of such mining, mountaintop mining with valley fills...
2010-01-01
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Rivers with poorly-sorted bed sediment create their own stratigraphy as they deposit sediment. Prediction of the subsequent river degradation into its own deposit requires knowledge of the spatial structure of the grain size variation of the...
2010-01-01
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As a river-carrying sediment mixture aggrade, it creates a stratigraphic signature that records this evolution. This stratigraphy is characterized by the vertical/horizontal variation of substrate grain size distribution. If a river degrades, it...
2010-01-01
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M. Gordon Wolman, known to all as “Reds,” died at his home in Baltimore, Md., on 24 February 2010. He was 85. His career was defined by fundamental contributions to scientists' understanding of rivers, pioneering work in developing...
2010-01-01
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There is clear evidence that the Minnesota River is the major sediment source for Lake Pepin and that the Le Sueur River is a major source to the Minnesota River. Turbidity levels are high enough to require management actions. We take advantage of...
2009-01-01
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This primer accompanies the release of BAGS, software developed to calculate sediment transport rate in gravel-bed rivers. BAGS and other programs facilitate calculation and can reduce some errors, but cannot ensure that calculations are accurate...
2009-01-01
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Despite decades of work on implementing best management practices to reduce the movement of excess nitrogen (N) to aquatic ecosystems, the amount of N in streams and rivers remains high in many watersheds. Stream restoration has become...
2008-01-01
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Studying river processes in the laboratory offers important advantages, particularly the opportunity for precise experimental control and the ability to isolate specific processes. There is, however, a key trade-off. To control essential variables...
2008-01-01
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Earlier measurements of stream channel geometry on 19 reaches were repeated to provide a longitudinal study of stream channel adjustment over 13 years (1987-2000) in the urbanizing Gwynns Falls, Maryland watershed. We observed both enlargement and...
2007-01-01
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We examine relations for hydraulic geometry of alluvial, single-thread gravel bed rivers with definable bankfull geometries. Four baseline data sets determine relations for bankfull geometry, i.e., bankfull depth, bankfull width, and down-channel...
2007-01-01
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Mountain gravel-bed rivers typically display a surface layer that is armored. That is, the surface layer visible at low flow is coarser than both the substrate and mean annual bedload transported. The surface layer is difficult to sample at the...
2006-01-01
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In a series of flume experiments using constant discharge, flow depth, and gravel feed rate, sand feed rates were varied from 0.16 to 6.1 times that of gravel. The bed slope decreased with increasing sand supply, indicating that the gravel could...
2005-01-01
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Channel responses to flow depletions in the lower Duchesne River over the past 100 years have been highly complex and variable in space and time. In general, sand-bed reaches adjusted to all perturbations with bed-level changes, whereas the...
2004-01-01
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We present a transport model for mixed sand/gravel sediments. Fractional transport rates are referenced to the size distribution of the bed surface, rather than subsurface, making the model completely explicit and capable of predicting transient...
2003-01-01
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Gravel budgets developed from changes in river morphology have emerged as an important tool for exploring stream dynamics and sediment transport. In many cases, old aerial photographs are the only data available by which to evaluate past...
2003-01-01
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Geomorphic models are increasingly used to support public policy and natural resources management. We present five examples of the interaction between models and managers and consider factors that influence their success or failure. Essential...
2003-01-01
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Old-growth forests experiencing widespread decline of yellow-cedar (Chamaecyparis nootkatensis) in southeast Alaska have a 3.8-fold increase in the frequency of landslides. We report here on an investigation of the cause of this increased slope...
2002-01-01
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Estimates of sediment transport rates in gravel-bed rivers are typically developed from formulae or from a sampling campaign. The former are notoriously inaccurate; the latter require a large effort and may still not achieve acceptable accuracy. A...
2001-01-01
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This is the second of two papers about experiments on downstream fining of gravel. Here we briefly summarize the complete series of runs described in the first paper, where the influence of sediment feed rate was evaluated in a narrow channel. We...
2000-01-01
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