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Keyword: sediment transport

Surface particle sizes on armoured gravel streambeds: Effects of supply and hydraulics

Publications Posted on: August 01, 2018
Most gravel-bed streams exhibit a surface armour in which the median grain size of the surface particles is coarser than that of the subsurface particles. This armour has been interpreted to result when the supply of sediment is less than the ability of the stream to move sediment. While there may be certain sizes in the bed for which the supply is less than the ability of the stream to transport these particles.

Measuring mountain river discharge using seismographs emplaced within the hyporheic zone

Publications Posted on: May 11, 2018
Flow and sediment transport dynamics in fluvial systems play critical roles in shaping river morphology, in the design and use of riverine infrastructure, and in the broader management of watersheds. However, these properties are often difficult to measure comprehensively. Previous work has suggested the use of proximal seismic signals resulting from flow and bed load transport to construct more complete records of these fluvial processes.

A sediment transport model for incision of gullies on steep topography

Publications Posted on: May 12, 2016
We have conducted surveys of gullies that developed in a small, steep watershed in the Idaho Batholith after a severe wildfire followed by intense precipitation. We measured gully length and cross sections to estimate the volumes of sediment loss due to gully formation. These volume estimates are assumed to provide an estimate of sediment transport capacity at each survey cross section from the single gully-forming thunderstorm.

Sediment transport data and related information for selected coarse-bed streams and rivers in Idaho

Publications Posted on: May 12, 2016
This report and associated web site files provide sediment transport and related data for coarse-bed streams and rivers to potential users.

Tenderfoot Creek Experimental Forest fluvial sediment transport data

Datasets Posted on: August 27, 2015
This data publication contains average daily sediment transport data recorded at eight locations in the Tenderfoot Creek Experimental Forest watershed from 1994 to 2014. Four sediment samplers were placed at the bottom of four sub-watersheds flowing into Tenderfoot Creek. These sub-watersheds are Spring Park Creek, Sun Creek, Stringer Creek and Bubbling Creek.

Monitoring the effects of the High Park fire

Documents and Media Posted on: January 23, 2015
The High Park fire burned over 350 km2 of wildland in the mountains west of Fort Collins, Colorado. It has since become the third-largest wildfire in Colorado’s history, during a particularly devastating 2012 fire season. Fire is a powerful and enduring force that has had, and will continue to have, a profound influence on National Forest land.   Document Type: Briefing Papers

Sediment transport in the West

Projects Posted on: January 21, 2015
Sediment transport through rivers creates and maintains aquatic habitat. In order to understand sediment transport, hydrology and geomorphology of an aquatic ecosystem must be considered.

Modeling the effects of pulsed versus chronic sand inputs on salmonid spawning habitat in a low-gradient gravel-bed river

Publications Posted on: March 12, 2014
It is widely recognized that high supplies of fine sediment, largely sand, can negatively impact the aquatic habitat quality of gravel-bed rivers, but effects of the style of input (chronic vs. pulsed) have not been examined quantitatively. We hypothesize that a continuous (i.e.

A probabilistic approach for channel initiation

Publications Posted on: July 24, 2006
The channel head represents an important transition point from hillslope to fluvial processes. There is a nonlinear threshold transition across the channel head with sediment transport much larger in channels than on hillslopes. Deterministic specific catchment area, a, thresholds for channel initiation, sometimes dependent on slope, S, in the form of aSα ≥ C, have been suggested.

A general power equation for predicting bed load transport rates in gravel bed rivers

Publications Posted on: July 24, 2006
A variety of formulae has been developed to predict bed load transport in gravel bed rivers, ranging from simple regressions to complex multiparameter formulations. The ability to test these formulae across numerous field sites has, until recently, been hampered by a paucity of bed load transport data for gravel bed rivers.