Design of Manning's-Rougness-Coefficient Study in New York State
Field-collected hydraulic data can be used to compute roughness coefficients for channels with different hydraulic characteristics. Suggested criteria for the design of a roughness-coefficient...
An Analysis of Flow Velocity Profiles, Stream Bed Roughness, and Resistance to Flow in Natural Gravel Bed Streams
The characteristics of 82 flow velocity profiles were analyzed from nine different gravel bed stream reaches. A statistical test of the linearity of flow velocity profiles indicates that...
Study of Friction Factors in the Upper Reaches of the Rio Grande
The purpose of this study is to investigate the determination of Manning's roughness in the upper Rio Grande river basin and compare results to other studies where Darcy Weisbach friction...
Floodflow Effects on Riparian Vegetation in Arizona
A relation for estimating changes in the condition of riparian vegetation as a function of stream power was developed for stream channels in central Arizona. Flood and vegetation data...
Roughness Coefficients for High-Gradient Channels in New York State
Manning's roughness coefficients (n values) were computed for a range of flows at six streams in New York State (USA) that have high energy gradients (greater than 0.002) and large median...
Supercritical Flows Versus Subcritical Flows in Natural Channels
Many analysts model large discharges and/or high-gradient reaches as supercritical flow. While this assumption may be valid for man-made channels of smooth, non erosive materials, and...
Critical and Supercritical Flows in two Unstable, Mountain Rivers, Toutle River System, Washington
Critical and supercritical flows are generally considered to be rare occurrences in natural river channels. This paper presents data and results pertaining to the existence of measured...
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...
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...
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...
Hydraulics and Sediment Transport Processes in a Pool-Riffle Rocky Mountain Stream
Sediment transport processes related to varying channel-bed morphology were investigated from April to November, 1993 along a 1 km pool-riffle and step-pool reach of North Saint Vrain...
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...
Velocity Control Rings for RC Pipe on Steep Slopes
This paper discusses the use of internal concrete rings to reduce velocity and concrete erosion for reinforced concrete pipes on steep slopes in the Southern California area....
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...
Air Entrainment and Bubble Behavior in Plunge Pools
This study analyzes air entrainment by falling nappes and bubble behavior in plunge pools, using an experimental-analytical-numerical method. The experimental work was done at the Tennessee...
Macro-Roughness Effects on Stream Reaeration
The gas transfer coefficient is key to modeling dissolved oxygen levels in streams. Engineers commonly predict it as a function of mean flow depth, velocity, and slope. Large errors are...
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