Denman Island Shoreline Mapping

Extracted text (beginning)

01,000   2,000   3,000500
Meters
DRAFT
1 Km
/
DATE:  October 14, 2011
Refer to Islands Trust Report “Gulf Islands Shoreline Mapping - Project Methodology” July, 2011 for detailed map information. 
Rock (Hard) ShorelinesSediment (Soft) Shorelines
PEBBLE/SANDBOULDER/COBBLEBLUFFLOW ROCK/BOULDERSEA CLIFF
• rocky shore with 
low slopes
• 35% of shoreline   
(18 Km)
• stable or accreting 
pebble-sand (or shell) 
beaches (may be 
eroding where sediment 
supply is interrupted).
• 18% of shoreline         
(9 Km)
• rocky shore with 
steep slopes
• 3% of shoreline     
(1.6 Km)
• boulder - cobble 
cover on beach (often 
indicates eroding 
shoreline)
• 29% of shoreline       
(14.7 Km)
• moderate to high 
slopes of sediment 
(often eroding)
• 9% of shoreline         
(4.6 Km)
MARSH/FINE SEDIMENT
• low energy shorelines 
with sediment inputs 
from watersheds 
nearby
• 5% of shoreline         
(2.8 Km)
marsh/fine sediment
01,0002,0003,000500
Meters
structurally altered*
*Shorelines 
modified 
by facility 
development, 
principally boat 
ramps,  seawalls, 
riprap, landfills, 
piers, groynes, or 
breakwaters.
DENMAN ISLAND: 
1 Km (2%) of 
Structurally 
Altered  Shoreline
Sections of shoreline 
with significant 
structural alterations 
(>30% altered)
LEGEND: 
low rock/boulder
boulder / cobble
pebble / sand
Watershed Boundaries
Drainage Conveyance Zones      
(wetlands, creeks & moist soil areas)
sea cliff
bluff
The Denman Island shoreline has three main morphologies: low rock/boulder or wave-cut platforms resistant to 
erosion, boulder/cobble lag deposits from eroding unconsolidated shorelines and sand/pebble/shell hash bars and 
tidal flats from re-worked fine sediments. The southeast side of Denman Island is exposed to southeasterly storm 
wind and waves, and the northeast side of Denman Island is exposed to northwesterly winds and waves.   
Significant areas of fine sediments, mudflats, or protected estuaries of low water circulation are present on 
the Denman shoreline, including Sandy Island and Seal Islets in the sand bar/wave-cut platform complex off the 
northern tip of the island.  There are lag deposits of boulder/cobble just below the high waterline from 
eroding unconsolidated shorelines on both east and west sides of the north section of Denman Island. 
There are also several areas of saltmarsh, and a bluff that serves as a critical source of sediment for the 
fine sediment shorelines, to the north of the island.
DENMAN I  s.
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:  
MAP 1 of 3:   Distribution of Shoreline Types

01,000   2,000   3,000500
Meters
DRAFT
1 Km
/
DATE:  October 14, 2011
Refer to Islands Trust Report

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