Accession Number : ADA299151

Title :   Dredging-Induced Near-Field Resuspended Sediment Concentrations and Source Strengths.

Descriptive Note : Final rept.,

Corporate Author : SOUTHERN METHODIST UNIV DALLAS TX SCHOOL OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s) : Collins, Michael A.

PDF Url : ADA299151

Report Date : AUG 1995

Pagination or Media Count : 232

Abstract : Dredging in riverine, lacustrine, and estuarine environments introduces bottom sediments into overlying waters because of imperfect entrainment and incomplete capture of sediments resuspended during the dredging process and the spillage or leakage of sediments during subsequent transportation and disposal of the dredged sediments. Resuspension of bottom sediments and resulting dispersal may pose water quality problems in waters near dredging operations. Interest in this issue increases when the sediment being dredged is highly contaminated. Resuspension of sediments by dredging is affected by dredge characteristics, dredge operating conditions, properties of bottom and suspended sediments, and site-specific conditions such as bottom topography, ambient current, and depth. This report summarizes field studies conducted by the U.S. Army Corps of Engineers to assess the suspended sediment concentrations in the water column in the vicinity of various dredge types. These concentration data are combined with conceptual models for resuspended sediment source strength geometries and velocity patterns to estimate sediment source strengths for cutterhead and clamshell dredges. Although unverified, these models provide a starting point for a more thorough analytical evaluation of the entire resuspension, transport, and deposition process. (AN)

Descriptors :   *SUSPENDED SEDIMENTS, *WATER QUALITY, *DREDGING, VELOCITY, MATHEMATICAL MODELS, QUANTITATIVE ANALYSIS, COMPARISON, TURBULENCE, TOPOGRAPHY, REGRESSION ANALYSIS, DEPOSITION, SEDIMENT TRANSPORT, TIDAL CURRENTS, CORRELATION, WATER POLLUTION, FLOW FIELDS, CONCENTRATION(COMPOSITION), DATA ACQUISITION, ARMY CORPS OF ENGINEERS, COASTAL ENGINEERING, DREDGED MATERIALS, BOTTOM, NEAR FIELD, HARBORS, ENTRAINMENT, ESTUARIES, RIVER CURRENTS.

Subject Categories : Civil Engineering
      Water Pollution and Control
      Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE