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The Transport of Gravels in Boulder-Bed Streams
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...

Thresholds for Gravel and Cobble Motion
Flows necessary to initiate motion of rocks on a lateral bar along the Gunnison River in Black Canyon of the Gunnison National Monument are observed. Gravel and cobbles are painted and...

An Approach to the Calculation Method of Mean Sediment Size
Mean sediment size is an important parameter expressing the characteristics of sediment. Several calculation methods of mean sediment size which are popular at present almost have some...

Step-Pool Streams: An Adjustment to Maximum Flow Resistance
An experiment was conducted to study the maximum flow resistance of step pool streams and the morphology of the steps formed from clastic materials. The step pool formation was qualitatively...

A General Theory of Channel Adjustment in High Gradient Streams
The paper presents a theory of channel adjustment in high gradient streams. This theory states that given sufficient energy, stream channels will adjust their dimensions and flow hydraulics...

Step Pool Geometry and Flow Characteristics in Low-Sediment-Storage Channel Beds
Data from two small ephemeral streams in Israel indicate that step pool geometry in bedrock channels is similar, in its salient features, to that in alluvial channels. For steep (>0.10)...

Analysis of blocking phenomena in bifurcated channels found in mountainous rivers
The paper presents an analysis of blocking phenomena in bifurcated channels found in mountain rivers. A change of channels may be caused by deposition of sediments which blocks the entrance...

Estimating Local Bed Shear Stress in Large Gravel-Bed Rivers
The local bed shear stress ?_o1 cannot be directly measured and is typically estimated using flow observations in various theoretical or empirical...

Turbulent Velocities in a Mountain River
A weighted, electronic Pitot tube was deployed in the swift, boulder-bed Waiho river during a 46 m³/s flow and a 214 m³/s...

On Habitat Simulation in Mountain Rivers
Mountain rivers are quite different from other rivers and one of the characteristics that distinguish them from others is the large variation in velocities with time, with location in...

Coarse Sediment Transport and the Maintenance of Fish Habitat in the Upper Colorado River
An analysis of the relation between discharge and boundary shear stress is presented for an alluvial reach of the Colorado River near Grand Junction, CO. The analysis indicates that the...

Palaeohydraulic reconstruction of floods in upland UK bedrock streams: progress, problems and prospects
Palaeoflood evidence from five small upland Pennine catchments in the UK is used with the HEC-2 flow routine to simulate Holocene peak discharges. Even allowing for uncertainty, sensitivity...

Streamflow Related to Channel Geometry in Northern New England
Channel geometry measurements can be used to estimate various streamflow characteristics at ungaged stream locations. Channel cross section dimensions and sediment size distributions were...

Historic-Flood Evaluation and Research Needs in Mountainous Areas
An evaluation of historic flood estimates in mountainous areas in Colorado was made to assess their accuracy. The purpose of this evaluation is to enhance awareness of the need to assess...

PSF-PM Verification of 3D Free Surface Flow Models
This paper reports an application of the Prescribed Solution Forcing (PSF) and Physical Modeling (PM) to the development of a systematic procedure for the verification of three-dimensional...

3D Free Surface Flow Model Verification - A Panel Discussion on Test Cases
This paper is to briefly present the objectives and approaches of the Panel Discussion on test cases to be developed for 3d free surface flow model verifications, so that professionals...

A Physically-Based Model of Channel Widening
The application of many existing models of river channel morphology is limited by their inability to account for bank erosion and changing channel width through time. This paper outlines...

Theoretically-Derived Regime River Width
The governing equations describing the motion of fluid and non-cohesive sediment particles in alluvial channels are combined to analytically determine the equilibrium surface width of...

Boundary Shear in the Vicinity of River Banks
Some experimental data are presented concerning the distribution of boundary shear stresses in trapezoidal open channels for both inbank and overbank flows. The local shear stresses on...

Expansion and Contraction of Powder River Between Moorhead and Broadus, MT: Geomorphic Observations and Numerical Modeling
Sixteen years of annual surveys demonstrate that the channel of Powder River expands at high flows and contracts at low flows. Channel contraction is associated with the formation of benches...

 

 

 

 

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