Accession Number:

ADA402532

Title:

Guadalupe River, California, Sedimentation Study. Numerical Model Investigation

Descriptive Note:

Final rept. Dec 2000-Nov 2001

Corporate Author:

ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICSLAB

Personal Author(s):

Report Date:

2002-05-01

Pagination or Media Count:

72.0

Abstract:

A numerical model study was conducted to evaluate the potential impact that the Guadalupe River flood-control project would have on channel stability in terms of channel aggradation and degradation. Potential sedimentation problems were determined by evaluating existing data and using the HEC-6W one-dimensional numerical sedimentation model. The numerical sedimentation study quantified the effects of proposed project features on potential aggradation and degradation in the project reach and compared those effects with those calculated for existing conditions. Sedimentation effects were determined for several flood hydrographs and a long-term hydrograph. Data were insufficient to develop a calibrated numerical model that could be used to produce reliable quantified predictions of channel response. However, sensitivity of the numerical model predictions to boundary conditions were determined so that channel responses with and without the project could be compared with confidence. Specific areas of concern were a sediment deposition downstream from bypass inlets during flood events b increased degradation in the channel downstream from bypass inlets where relatively sediment-free flow would be returned to the channel and c increased degradation in reaches where bypasses would not reduce channel flows. Due to limited resources, the study was conducted using available data.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Soil Mechanics
  • Operations Research

Distribution Statement:

APPROVED FOR PUBLIC RELEASE