Effect of Pier Geometry on Scour in Graded Gravels
This paper summarizes the results of laboratory tests performed on clear water scour around circular and rectangular cross section bridge piers, embedded in a non-uniform coarse sediment...

Is Bedform Development Chaotic?
A qualitative analysis of a model for the partially specified bedform development system is presented. The study rests on the use of technique of loop analysis and the connection of the...

Contaminant Fate and Transport Model in Pool-and-Riffle Streams
The complex nature of solute transport and transformation processes in natural streams has been investigated using numerical solution of a proposed mathematical model. This model is based...

Monitoring and Modeling the Transport of Coarse Single Particles in Mountain Rivers
The dynamics of single cobbles was studied in the alpine river Lainbach using the Magnetic Tracer Technique (MATT) and radiotransmitters (PETSY = PEbble Transmitter SYstem). Our measurements...

Roughness Coefficient in Mountain Rivers
River discharge estimations require an evaluation of the river flow resistance that generally is related with Manning's roughness coefficient. The literature suggests different ways of...

An Alternative Equation for the Mean Velocity in Gravel-Bed Rivers and Mountain Torrents
Including new field data in the slope range of torrents up to 63%, an empirical equation is developed to express the mean flow velocity in terms of the flow rate, the slope and a characteristic...

Flow-Bed Interaction and Energy Loss in Torrents

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...

Bias in Regression Estimates of Manning's n
Selected equations for estimating roughness for gravel-bed streams were tested using a composite data set containing much of the data used to define the equations. All equations tested...

Bed Load Roughness in Supercritical Flow
A supercritical concrete channel has been proposed for Mission Creek located in Santa Barbara County, California. The proposed channel could transport gravels and cobbles as bed load during...

Fluvial Hydraulics of Streams and Mountain Rivers with Mobile Bed
The local hydraulic conditions concerning the incipient motion of the bed material in mountain streams are considered. Results of measurements carried out by using the radioisotope tracer...

Energy Losses in Steep Tributary Streams at Flows Near The Threshold of Bedload Entrainment
The flow patterns in mountain tributary streams that depends on the channel morphology, cobbles, boulders and debris that protrude along the channel and bank height cause energy losses...

Monitoring Gravel Movement Using Radio Transmitters
Radio transmitters were used to track the movement of coarse sediment particles in a mountain river during a period of high flow and high bed mobility. Transport was characterized by episodes...

Some Benefits of Grid by Number Sampling
Describing the overall sediment composition of gravel-bed river reaches and depositional bars is a difficult problem due to spatial variations in the sediment size. Past research has focused...

Effects of Particle Shape on Bedload Transport
The effects of particle shape on bedload transport in gravel-bed streams are examined using a similarity approach and fractional transport analysis for data from Piceance Creek, Colorado,...

Bed Load Prediction in Steep Mountain Rivers
The characteristics of the stream channel morphologies in a very steep mountain ravine are explained by the data obtained through the longterm field observation. The bed load transportation...

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)...

Estimating Local Bed Shear Stress in Large Gravel-Bed Rivers
The local bed shear stress τo1 cannot be directly measured and is typically estimated using flow observations in various theoretical or empirical...

Particle Dynamics and Bed Level Adjustments in a Mountain Stream
The focus of the study was the interaction of coarse bedload sheets with a near-static bed. At a critical discharge bed sediment was transported from upstream sources through the study...

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...

 

 

 

 

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