Gambier Island Shoreline Mapping

Extracted text (beginning)

0   1,000   2,000   3,000500
Met er s
DRAFT
DATE:  October 17, 2011
Refer to Islands Trust Report “Gulf Islands Shoreline Mapping - Project Methodology” July, 2011 for detailed map information. 
/
1 Km
Rock (Hard) ShorelinesSediment (Soft) Shorelines
PEBBLE/SANDBOULDER/COBBLEBLUFFLOW ROCK/BOULDERSEA CLIFF
• rocky shore with 
low slopes
• 31% of shoreline   
(25 Km)
• stable or accreting 
pebble-sand (or shell) 
beaches (may be 
eroding where sediment 
supply is interrupted).
• 4% of shoreline             
(3 Km)
• rocky shore with 
steep slopes
• 52% of shoreline    
(42 Km)
• boulder - cobble 
cover on beach  (often 
indicates eroding 
shoreline)
• 11% of shoreline        
(9 km)
• moderate to high 
slopes of sediment 
(often eroding)
• Gambier Island has no 
bluff shores
MARSH/FINE SEDIMENT
• low energy shorelines 
with sediment inputs 
from watersheds 
nearby
• 1% of shoreline          
(2 Km)
01,0002,0003,000500
Met er s
*Shorelines 
modified 
by facility 
development, 
principally boat 
ramps,  seawalls, 
riprap, landfills, 
piers, groynes, or 
breakwaters.
GAMBIER ISLAND: 
1.1 Km (1.4%) of 
Structurally Altered  
Shoreline
Sections of shoreline 
with significant 
structural alterations 
(>30% altered)
LEGEND: 
structurally altered*
boulder / cobble
marsh/fine sediment
low rock/boulder
Watershed Boundaries
Drainage Conveyance Zones      
(wetlands, creeks & moist soil areas)
sea cliff
pebble / sand
Islands Trust
Preserving island communities, culture and environment
MAPPING PRODUCTS PRODUCED BY:    Murdoch de Greeff Inc. (Project Lead) | Coastal and Ocean Resources Inc. | Archipelago Marine Research Ltd. | Land & Water Inc.             IN PARTNERSHIP WITH:    UBC School of Architecture and Landscape Architecture  and the  Islands Trust.
PROJECT FUNDING GENEROUSLY PROVIDED BY:  
The Gambier Island shoreline is largely bedrock and resistant to erosion. There are a few sand and shell pocket beaches 
which are very important recreationally.  Gambier Island is protected east and west by steep terrain surrounding 
Howe Sound, by Anvil Island to the north, and by Bowen and Keats Islands to the south.  Gambier Island is occasionally 
exposed to south westerly storm winds and waves through Collingwood and Shoal Channels, and occasionally exposed 
to northerly outflow winds in Howe Sound.  There is a fine sediment flat at the head of Port Graves.  No salt marsh was 
mapped in the c. 1990 ShoreZone dataset, and could not be determined with certainty on the Islands Trust air photo. 
GAMBIER Is.
MAP 1 of 3:   Distribution of Shoreline Types

0   1,000   2,000   3,000500
Met er s
DRAFT
DATE:  October 17, 2011
Refer to Islands Trust Report “Gulf Islands Shoreline Mapping - Project Methodology” July, 2011 for detailed map information. 
/
1 Km
SEASONAL WAVES
LEGEND:
Very Low
Low
Medium
High
Wave Exposure:
Watershed Sediment Inputs to Shoreline System
Localized Sediment Movement Direction (Small Scale)
Predominant Direction of Wave Energy
Sediment Movement:
W

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