Keats Island Shoreline Mapping

Extracted text (beginning)

1 Km
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DATE:  February 21, 2013
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)
structurally altered*
KEATS ISLAND:  
1.5 Km (9%) 
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
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 Keats Island shoreline is largely rock-controlled and resistant to erosion, except for some sections of cobble and sand shoreline where either the 
backshore is comprised of unconsolidated materials, or sediment has collected in depositional pocket beach environments.  The south side of Keats Island 
is protected on the southwest and south side by Bowen Island as well as a group of small islands (ie: Popham, Hermit and Pasley Islands) that effectively 
break	up	storm-generated	waves	moving	across	Georgia	Strait.			the	northeast	side	of	Keats	Island	is	exposed	to	northeasterly	outflow	winds	that	flow	
down Howe Sound, but again largely protected from storm waves by Gambier Island.  So although Keats Island is located at the mouth of Howe Sound, the 
shoreline	is	a	relatively	low-energy	shoreline	from	a	wave	and	sediment	movement	perspective.		However,	wind	is	likely	a	significant	factor	affecting	both	
the north and south shorelines.
*Shorelines modified by facility development, principally 
boat ramps,  seawalls, riprap, landfills, dykes, piers, 
groynes, or breakwaters.
KEATS ISLAND
MAP 1 of 3:   Distribution of Shoreline Types

1 Km
/
DATE:  February 21, 2013
Refer to Islands Trust Report “Gulf Islands Shoreline Mapping - Project Methodology” July, 2011 for detailed map information. 
SEASONAL 
NORTHEASTERLY
OUTFLOW WINDS
LEGEND:
Very Low
Low
Medium
High
Wave Exposure:
Watershed Sediment Inputs to 

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