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DigitalCommons@USU
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A natural decline in the population of yellow-cedar (Clla~mecyparis nmthtensis) is occurring in pristine southeast Alaska forests and may be the most S~Icant forest decline in the western United States. The frequency of landslides in cedar decline...
1998-01-01
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The prediction of sediment transport in gravel-bed rivers is essential to the management of land, water, and ecological resources in mountain regions. Dividing the bed sediment into two populations—sand and gravel—permits realistic and useful...
1998-01-01
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Reservoir releases may be specified to flush interstitial fine sediment from gravel beds in the river downstream. Choice of an effective flow depends on trade-offs among discharge, flow duration, and pool dredging as they determine rates of bed...
1998-01-01
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The Calvert Cliffs, Chesapeake Bay, Maryland, USA, erode by direct wave undercutting or by freeze/thaw erosion accompanied by wave removal of slope debris. Directly undercut slopes recede more rapidly, with long-term rates exceeding 1.0 m/yr;...
1998-01-01
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The mass and size distribution of grain entrainment per unit bed area may be measured by replacing a volume of the bed with tracer gravels and observing the mass difference before and after a transport event. This measure of spatial entrainment is...
1997-01-01
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We present the results of three laboratory experiments in which longitudinally sorted deposits were formed by feeding poorly sorted sediment at the upstream end of a narrow, 45-m-Iong channel. The input sediment had a median size of 6 mm and...
1997-01-01
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The growing public awareness that human activities can harm rivers is leading to rapid growth in efforts to restore river channels to some acceptable, if not natural, state. There is a corresponding increase in criticism from the scientific...
1997-10-01
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The critical shear stress of individual fractions "rci in unimodal and weakly bimodal sediments shows little variation with grain size and depends only on the mean grain size bf the mixture. For strongly bimodal sediments, ~'ci increases with...
1993-01-01
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Two standard modes of laboratory sediment transport flume operation are sediment‐feed and recirculating. In the case of uniform sediment, the final equilibriums achieved in the two modes are equivalent and independent of initial conditions, even...
1995-03-01
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There has long been debate about the relative importance of abrasion versus selective deposition of the coarsest clasts in causing downstream fining of sediment in river systems. Although high fining rates observed in many natural rivers seem to...
1992-01-01
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The largest grains found in samples of transported sediment are commonly used to estimate flow competence. With samples from a range of flows, a relationship between the flow and the largest mobile grain can be derived and used to estimate the...
1992-01-01
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Most agree that there is room for improvement in the science and engineering basis for stream restoration. There is also a bewildering array of methods and models, the application of which requires a diverse range of expertise and effort with...
2006-01-01
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The transported load in many fluvial systems consists of a significant component of fine- grained sediment. In these systems river morphology is largely determined by deposition of fine sediment on the bed and banks. Existing models for suspended...
2005-01-01
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The transported load in many fluvial systems consists of a significant component of fine- grained sediment. In these systems river morphology is largely determined by deposition of fine sediment on the bed and banks. Existing models for suspended...
2005-01-01
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A successful stream restoration design must be able to transport the sediment supplied to it with the available flow. Although this guidance is widely cited, only water supply is routinely incorporated in a consistent manner in restoration design....
2004-01-01
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In boulder-bed streams, gravel is typically found in isolated pockets protected by local flow obstructions. The deposition and entrainment of these gravels depend strongly on the local geometry of boulders and banks, which control the flow and...
1994-01-01
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Replicate velocity observations using conventional equipment under typical field conditions are used to evaluate the precision of different methods for estimating local boundary shear stress from velocity measurements. The bed shear velocity u,...
1994-01-01
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Flushing flows are high flow releases designed to remove fine sediment accumulated in river gravels downstream of reservoirs. These releases must be designed to maximize transport of sand-sized (and finer) sediment, whilst minimizing transport of...
1993-01-01
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We present the results of three laboratory experiments in which longitudinally sorted deposits were formed by feeding poorly sorted sediment at the upstream end of a narrow, 45-m-Iong channel. The input sediment had a median size of 6 mm and...
1992-01-01
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