Short-Span Bridge Solutions
Large bridges get most of the headlines, but the nation's huge network of small bridges (many with spans of less than 25 ft) may be more in need of replacement. Age, corrosion,...
Sediment Yields from a Watershed in Taiwan
Characteristics of suspended sediment load were investigated for Shih-Men Reservoir watershed in Taiwan. Results of the investigation showed that annual suspended sediment load was correlated...
Hydraulic Desiltation for Noncohesive Sediment
Sedimentation reduces the useful life of a reservoir. The physical processes of flushing sediment are not well-understood. Flushing processes can be classified into two categories: local...
Optimization Modeling for Sedimentation in Alluvial Rivers Considering Uncertainties
A nonlinear optimization model is formulated for determining optimal reservoir releases to minimize channel bed aggradation and degradation in downstream rivers. The model is based upon...
Fundamental Principles of Tidal Wetland Restoration
Recognition of the vital role of tidal wetlands for sustaining migratory bird life, for indigenous animal habitat, and for the fishery of contiguous waters has stimulated efforts to restore...
Disaster Reduction in Dam and Reservoir Design
Disaster reduction for small- and medium-sized reservoir projects is considered for two specific types of dam failure: 1) during extremely high floods, and 2) when severe reservoir silting...
Total Sediment Loads of Tropical Rivers
Unmeasured and total sediment discharges were computed for 107 sets of data from the Amazon and Orinoco Rivers and their major tributaries. Unmeasured loads were generally small except...
Sedimentation and Flood Protection for the Lower Yellow River
The Lower Yellow River is known for its disastrous floods in the past. After 4 decades without major floodings, rapid economic and population growths along the River have drew concerns...
Development of the Lake Okeechobee Watershed Phosphorus Transport Model
The Lake Okeechobee watershed phosphorus model was developed to route flows and phosphorus loadings associated with point and nonpoint sources through a watershed transport system, and...
Surface Flows Over Intertidal Marshes
A marsh-flow measuring device has been designed to quantify the flow across the marsh surface. The fluorometric technique by tracking the visible substance (Rhodamine red dye) applied...
Current Legal Issues in Sedimentation
This paper represents the updating of Chapter 7 for Manual 54. There has been considerable change in legal rulings and precedent law since the first edition of Manual 54. Many of these...
Updating Chapter II?Sediment Transportation Mechanics
Chapter II, the most comprehensive chapter of the Sedimentation Engineering Manual, has aged. The manual prepared by the Task Committee for the Manual on Sedimentation was published by...
Computational Modeling of Sedimentation Processes
The Committee on Computer modeling is a part of the task force on updating ASCE Manual 54, `Sedimentation Engineering.' The task will require a new chapter since computer...
Scour Analysis at Highway Structures
ASCE Manual 54 entitled, `Sedimentation Engineering' is being revised. In the revision, a chapter on `Scour at Highway Bridges' will be included. This paper will describe in general terms...
Modeling the Fate and Transport of Toxic Heavy Metals in South San Francisco Bay
A two-dimensional vertically-averaged finite element model for the fate and transport of cohesive sediments and associated toxic heavy metals was utilized to predict the spatial and temporal...
Relationships Between Flow and Benthic Communities
Current flows can affect directly factors critical to the survival of benthic communities, including the availability of food and nutrients, the chemical quality of water surrounding benthic...
Economic Aspects of the Bureau of Reclamation Safety of Dams Program
The paper briefly examines economic aspects of the Bureau of Reclamation (Reclamation) Safety of Dams (SOD) program evaluation process. Procedures described include the downstream damage...
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,...
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