Accession Number:

AD1103256

Title:

Hydrodynamics of a Recently Restored Coastal Wetland: Hamilton Wetlands, California

Descriptive Note:

Technical Report

Corporate Author:

ERDC Vicksburg United States

Report Date:

2020-07-01

Pagination or Media Count:

117.0

Abstract:

Hamilton Wetlands is a recently restored tidally influenced basin located along the northwest coast of San Pablo Bay, California. Instruments to measure waves, currents, and wind were deployed for a period of up to 2 years shortly after tidal flow was re-introduced to the wetland to examine the sediment and hydrodynamic response. The results indicate that local re-suspension is relatively rare owing to the weak interior tidal currents and the limited fetch within the 3 km long basin. Asymmetries in the acoustic backscatter intensity combined with the much higher flow speeds measured at the entrance suggest a net import of fine sediment. The basin also experiences a distinct seasonal variation that likely contributes to sediment re-distribution. During the summer months, higher wind speeds correlate with turbidity suggesting local re-suspension of fines that are distributed by winds. Overall, the measurements suggest that the sediment dynamics in this shallow water system are controlled by two main factors 1 net sediment import through the inlet entrance and 2 mixing of interior sediment through a combination of intermittent wind and wave stirring.

Subject Categories:

  • Ecology
  • Hydrology, Limnology and Potamology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE