Super Bulkhead Wharf: Seismic Adaptation Measure

Example of piles installed to support new wharf structure ©SGH


SHORELINE STABILIZATION:
TYPE: Structural

SHORELINE LOCATION:
Nearshore


DESIGN LIFE
ADAPTABILITY
IMPACT ON THE WATERFRONT
CONSTRUCTION COST
75+ Years
Medium
Minor Intervention
High


SEISMIC HAZARDS MITIGATED:SEISMIC PERFORMANCE IMPROVED:
Lateral Spreading
Liquefaction
StructuresUtilities & Transportation


MEASURES COMPATIBILITY:
Flood
Seismic
Raised Marine Structures


Liquefaction Mitigation

Utility Retrofit


DESCRIPTION:
New robust wharf structure that would replace an existing wharf. This would be strong enough and stiff enough to buttress the adjacent liquefiable fill and thus reduce ground displacements that would otherwise damage the Embarcadero, the promenade, the light rail, and utilities.


CONSIDERATIONS:
ADVANTAGES:
DISADVANTAGES:
  • The quantity and diameter of the piles would be defined by the depth of the Young Bay Mud which varies along the waterfront.
  • Measure is not effective in areas of medium to deep Young Bay Mud.


  • Less construction impact to the Embarcadero and promenade compared to landside shoreline stabilization measures.
  • Replaces deteriorated wharf structures. Can elevate wharf for future sea level rise protection.


  • Construction would require closure of waterfront buildings and relocation of tenants when the work occurs at an occupied pier.
  • Construction duration likely longer than other shoreline stabilization measures.
  • Does not mitigate liquefaction-induced settlements.
  • Pile driving through rock dike can be noisy.



CONSTRUCTION IMPACTS TO THE PUBLIC:
SEA LEVEL RISE ADAPTATION OPPORTUNITIES:
  • Construction would require temporary relocation of waterfront buildings to allow demolition and reconstruction of the wharf below. • Impacts would be most noticeable to the occupants of the affected pier.
  • Most construction work would be done from the water-side of the seawall.
  • Impacts to users of the promenade and the Embarcadero would be limited.
  • New wharf could be placed at a higher elevation and could support a flood barrier at the wharf edge.



DESIGN CONSIDERATIONS:

  • The quantity and diameter of the piles would be defined by the depth of the Young Bay Mud which varies along the waterfront.
  • Measure is not effective in areas of medium to deep Young Bay Mud.

SITE-SPECIFIC CONSIDERATIONS:

  • This measure is likely limited to the Fisherman's Wharf area and the northern end of the Embarcadero where the Young Bay Mud is shallow.

URBAN DESIGN CONSIDERATIONS:

  • Rebuilt wharf structures can be designed with improved materials and uses.

HISTORICAL RESOURCE CONSIDERATIONS:

  • Historic pier-supported buildings would need to be removed temporarily during construction and replaced once the work is complete.

INSTALLATION AND CONSTRUCTABILITY CONSIDERATIONS:

  • Driving large steel piles through rock dike may require pre-drilling.


Download the Super Bulkhead Wharf Factsheet.

Learn about other types of measures from our Measures Explorer page.


Example of piles installed to support new wharf structure ©SGH


SHORELINE STABILIZATION:
TYPE: Structural

SHORELINE LOCATION:
Nearshore


DESIGN LIFE
ADAPTABILITY
IMPACT ON THE WATERFRONT
CONSTRUCTION COST
75+ Years
Medium
Minor Intervention
High


SEISMIC HAZARDS MITIGATED:SEISMIC PERFORMANCE IMPROVED:
Lateral Spreading
Liquefaction
StructuresUtilities & Transportation


MEASURES COMPATIBILITY:
Flood
Seismic
Raised Marine Structures


Liquefaction Mitigation

Utility Retrofit


DESCRIPTION:
New robust wharf structure that would replace an existing wharf. This would be strong enough and stiff enough to buttress the adjacent liquefiable fill and thus reduce ground displacements that would otherwise damage the Embarcadero, the promenade, the light rail, and utilities.


CONSIDERATIONS:
ADVANTAGES:
DISADVANTAGES:
  • The quantity and diameter of the piles would be defined by the depth of the Young Bay Mud which varies along the waterfront.
  • Measure is not effective in areas of medium to deep Young Bay Mud.


  • Less construction impact to the Embarcadero and promenade compared to landside shoreline stabilization measures.
  • Replaces deteriorated wharf structures. Can elevate wharf for future sea level rise protection.


  • Construction would require closure of waterfront buildings and relocation of tenants when the work occurs at an occupied pier.
  • Construction duration likely longer than other shoreline stabilization measures.
  • Does not mitigate liquefaction-induced settlements.
  • Pile driving through rock dike can be noisy.



CONSTRUCTION IMPACTS TO THE PUBLIC:
SEA LEVEL RISE ADAPTATION OPPORTUNITIES:
  • Construction would require temporary relocation of waterfront buildings to allow demolition and reconstruction of the wharf below. • Impacts would be most noticeable to the occupants of the affected pier.
  • Most construction work would be done from the water-side of the seawall.
  • Impacts to users of the promenade and the Embarcadero would be limited.
  • New wharf could be placed at a higher elevation and could support a flood barrier at the wharf edge.



DESIGN CONSIDERATIONS:

  • The quantity and diameter of the piles would be defined by the depth of the Young Bay Mud which varies along the waterfront.
  • Measure is not effective in areas of medium to deep Young Bay Mud.

SITE-SPECIFIC CONSIDERATIONS:

  • This measure is likely limited to the Fisherman's Wharf area and the northern end of the Embarcadero where the Young Bay Mud is shallow.

URBAN DESIGN CONSIDERATIONS:

  • Rebuilt wharf structures can be designed with improved materials and uses.

HISTORICAL RESOURCE CONSIDERATIONS:

  • Historic pier-supported buildings would need to be removed temporarily during construction and replaced once the work is complete.

INSTALLATION AND CONSTRUCTABILITY CONSIDERATIONS:

  • Driving large steel piles through rock dike may require pre-drilling.


Download the Super Bulkhead Wharf Factsheet.

Learn about other types of measures from our Measures Explorer page.