Coastal Engineering & Shoreline Erosion

Presidio Parkway Project | City of San Francisco, California

Aerial View of the Project Site
Aerial View of the Project Site
Client:
Caltrans District 4, Presidio Trust and Golden Link Partners
Project Description:
The existing south access road to the iconic Golden Gate Bridge, known as Doyle Drive or US 101, is structurally and seismically deficient and must be replaced. Doyle Drive has been re-envisioned as the Presidio Parkway, which will replace the existing corridor with a new six-lane facility including bridge structures, viaducts, tunnels, and at-grade roadways.

For this project, WRECO is performing tidal and tsunami analyses, which is a key aspect of design due to the close proximity of the project to the San Francisco Bay. The tailwater elevations adopted for the study considered tidal water surface elevations, tsunami wave runup water surface elevations, and potential sea level rise due to global warming.

WRECO researched previous tidal hydrology studies and tsunami prediction reports. WRECO also performed a frequency analysis using the Automated Coastal Engineering System (ACES) program, which was developed by the United States Army Corps of Engineers to estimate tidal and tsunami water surface elevations. Tidal data was collected from the National Oceanic and Atmospheric Administration's (NOAA) database. Tsunami wave runup data was obtained from NOAA's World Data Center for Geophysics and Marine Geology website. The estimated water surface elevations for each source were then projected to a future year, assuming sea level rise for the design service life of the bridge. Two references were utilized to estimate sea level rise with low and high values for each source. Because the project is located in a tidal area, the project considered both the 100- and 500-year return periods.

Additionally, WRECO is working on the drainage and stormwater treatment design for the project.

Key Tasks:
Bridge Hydraulic Studies, Tidal and Tsunami Analyses, Drainage Design and Stormwater Treatment Design
Southbound Battery Tunnel
Southbound Battery Tunnel
To request more information regarding WRECO's coastal engineering and shoreline erosion projects, email us at marketing@wreco.com.

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