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U.S. Geological Survey Bedload Sampling Policy
During the late 1960's, the U.S. Geological Survey's (USGS) Water Resources Division (WRD) developed the Helley-Smith bedload sampler. Since then, the USGS and the Technical Committee...

Incipient Motion in Gravel-Bed Rivers
Incipient motion processes are reviewed for bed material in gravel-bed rivers. Prediction difficulties are identified. Research results are reported for field and flume studies to investigate...

Sediment Budgets in Gravel Bed Streams
A sediment budget/mass balance technique is presented for use in assessment of sediment transport by river reach in gravel bed streams. Selection of appropriate gravel bed transport equations,...

Extreme Events and Coastal Wetlands
Temporal ecosystem behavior in tidal wetlands can be static, dynamically stable, progressively changing, or subject to catastrophic change during extreme events. Catastrophic change in...

A Model of Mixing in a Stratified Tidal Flow
We will describe a simple model of vertical mixing in a stratified tidal flow that might be observed in shallow estuary like San Francisco Bay. The model flow is driven by a specified...

Yolo Bypass Wetlands?Impact Investigation
Approximately 20 square kilometers of wetland facilities are proposed to be installed within the Yolo Bypass of the Sacramento River Flood Control Project. A hydraulic impact investigation...

Weaver Bottoms Backwater Rehabilitation
Navigation channel dredge material was used to construct closure structures and islands in lower pool 5 on the Upper Mississippi River in 1986. Primary objectives included aquatic habitat...

Flow and Scour Near an Abutment
Laboratory experiments were used in conjunction with a two-dimensional depth-averaged numerical flow model, RBFVM-2D, to investigate the relationship between flow velocity distribution...

The Fallacy of Local Abutment Scour Equations
Existing laboratory model studies for quantifying local abutment scour deviate significantly from conditions typically found in the field. This has resulted in predictive local abutment...

Scour Prediction Model at Bridge Abutments
A model to predict local abutment scour is presented. The model is based on a large number of laboratory experiments over the past half century. The dependent variable, a ratio that includes...

Bridge Abutment Scour in a Floodplain
Recent bridge failures due to pier and abutment scour have reinforced the need for better methods of scour prediction. This paper addresses the problem of prediction of clear-water scour...

Bridge Abutment Scour in Compound Channels
Experiments are reported which quantify the effect of channel geometry on local scour at abutments for bridges crossing compound river channels. The channel geometry effects are represented...

Plans for a Sensitivity Analysis of Bridge-Scour Computations
Plans for an analysis of the sensitivity of Level 2 bridge-scour computations are described. Cross-section data from 15 bridge sites in Texas are modified to reflect four levels of field...

Computational Hydraulics?The Systems Approach
This paper introduces two modern computational hydraulic computer programs that combine the calculated subcritical and supercritical water surface profiles and pressure gradients in open...

Computer Aided Design and Cost Estimation of Gabion Lined Channels
Rivers are a dynamic part of the hydrologic cycle. Changes in discharge, flow depth, water velocity, and meander patterns contribute to this dynamic nature. As a result, portions of a...

Water Surface Profile Computations?How Many Sections do I Need?
One-dimensional streamflow models, including standard-step models, require a sufficient number of cross sections to satisfy two needs. First, a sufficient number of cross sections must...

Simulation of River Bed Evolution Below Tsengwen Reservoir in Taiwan
An uncoupled, one-dimensional river model, capable of simulating bed evolution, hydraulic sorting and armoring under unsteady flow conditions is presented in this paper. This unsteady...

On the Applicable Ranges of Kinematic and Diffusion Models in Open Channels
The kinematic and diffusion models using simplified momentum equations of the full dynamic equation have been frequently used for numerical flow simulations, because they have several...

Predicting Water Quality at Municipal Water Intakes?Part I: Application to the Contra Costa Canal Intake
The factors affecting water quality at a municipal surface water intake in the Sacramento-San Joaquin Delta are discussed. A model is developed that successfully predicts the seawater...

Predicting Water Quality at Municipal Water Intakes Part 2: Application to the Southern Sacramento-San Joaquin Delta
Work in progress on developing methodologies for predicting water quality at Municipal intakes in the Sacramento-San Joaquin Delta is discussed. Principal sources of salinity are identified...

 

 

 

 

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