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Landscape Ecology:Sustainable Urban Landscape Patterns
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The Language of Landscape Ecology
Elements and anatomy• Patches • Edges • Corridors• Mosaics
spatial theory with no distinction between built and natural environments
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Patches
origins of patches:• remnant• introduced• disturbance• resource
protection
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Patch dynamics
large patches have more coredividing a patch creates more edge
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Patch dynamics
large patches have more coredividing a patch creates more edge
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Patch dynamics
a critical mass of interdependent activity is lost when urban cores are segmented
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Patch dynamics
a critical mass of interdependent activity is lost when urban cores are segmented
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Patch dynamics
large patches have higher population and less likelihood of extinction over time
time
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Patch dynamics
large patches have higher population and less likelihood of extinction over time
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Patch dynamics
smaller, under-populated neighborhoods may be lost over time
time
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Patch dynamics
smaller, isolated elements may be lost over time
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Patch dynamics
large patches have more habitat diversity and greater population diversity
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Patch dynamics
large urban areas have more settings, encouraging more diverse populations and activities
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Patch dynamics
large urban areas have more diverse populations
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Patch dynamics
a system of small patches may support a comparable amount of activity, though diverse in type
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Patch dynamics
a network of districts or activities in an urban area may perform competitively with larger ones
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Patch dynamics
Portland, Oregon grid of patches
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Patch dynamics
Portland, Oregon
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Patch dynamics
patches closer to a larger patch will be more likely to maintain their populations; farther patches risk extinction
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Patch dynamics
villages closer to the urban core are more likely to have sustained occupancy and activity
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Edges
characteristics of edges:• cross-section• straight or convoluted• width• vulnerability• transitional• filtering/buffering
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Edges
Abrupt edges encourage parallel movement.
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Edges
Pastureland at forest edge
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Edges
Abrupt edges encourage parallel movement and discourage lateral movement.
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Edges
Suburban to rural sprawl
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Edges
Convoluted edges have more length, and contain coves and lobes, encouraging movement through them.
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Edges
Convoluted edges have more length, and contain coves and lobes, encouraging movement through them.
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Edges
Patterns that relate to CONTACT and EXCHANGE are valid for both built and natural systems
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Edges
Vertical change that is less abrupt has more structural diversity.
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Edges
Vertical change that is less abrupt has more structural diversity.
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Edges
Directional forces (sun, wind) produce wider edges.
rr
r
r
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Edges
Directional forces (microclimate, people) produce wider edges.
rr
r
r
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Edges
Convoluted edges foster more +/- interaction.
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Edges
Convoluted edges foster more +/- interaction.
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Corridors
characteristics of corridors:• connect shrinking patches• allow continuity and movement• may dissect patches• create barriers• filter movement
rivers power lines hedgerows canals roadways bikeways tunnels
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Corridors
Continuity and width influence the function of corridors.
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Biodiversity Corridors
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Biodiversity Corridors
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Pedestrian Corridors
Continuity and width influence the function of corridors.
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Corridors
Oxford Circus (London)
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Corridors
Continuity and width influence the function of corridors, also when they are barriers.
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Corridors
“Stepping stones” may provide most corridor functions.
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Corridors
“Stepping stones” may provide most corridor functions.
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Parallel Corridors
River corridors with vegetation corridors have mutual benefits.
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Parallel Corridors
Road corridors benefit from parallel pedestrian corridors.
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Corridor constraints
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Corridors
(San Antonio, TX)
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Corridors
Austin, TX
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Corridors
Austin, TX
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The case of Thorton Creek
Seattle, WA
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The case of Thorton Creek
Seattle, WA
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The case of Thorton Creek
Seattle, WA
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The case of Thorton Creek
Seattle, WA
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The case of Thorton Creek
680-acre watershed
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The case of Thorton Creek
680-acre watershed
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Corridors of patches
Ladder patterns may be more effective than narrow parallel corridors for streams.
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Corridors
Willamette River
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Corridors-Urban Core
Parallel corridors with street treesmay or may not have mutual benefits.
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Corridors-Urban Core
Ladder patterns may be more effective than narrow parallel corridors for roads.
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Corridors-Urban Core
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Corridors-Urban Core
30 units (sites) for buffer
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Corridors-Urban Core
17 units (sites) for buffer
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Ladder Pattern-Pocket Parks
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Mosaics
characteristics of mosaics:• pattern• scale• connectivity• networks• circuitry• mesh size
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Mosaics
Pattern is created by the arrangement and layering of spatial geometry.