Blue Green Toolkit

Analysis of benefit distribution in Blue Green Cities: A spatial toolkit

Dr Lan Hoang

Department of Engineering

LAA meeting, Newcastle25 November 2014

Centre forSustainable Development

Outline

How the Blue-Green Cities project explores flood risks and the multiple benefits of flood risk strategies to cities

Multiple benefits from Sustainable Urban Drainage SystemsGreen Infrastructure

Project Aim: Develop and rigorously evaluate strategies for managing flood risk that deliver multiple benefits as part of urban planning and renewal

Department of EngineeringCentre for Sustainable Development

Water Sensitive Cities


Multiple Benefits of Green Infrastructure


Grey versus Green Solutions (Portland , Oregon)


The three point approach


Grey versus Green Solutions

Urban interdependencies

Functional Complexity: the linkages across

the urban components which can influence

their primary function

Source: OTAK

Relational Complexity: the governance

linkages across the corresponding planning

and management agencies

Source: eastpdxnews.com

Functional Complexity (Physical)•Reduces heat island effect•Reduces temperature in building•Protects roofing material•Increases biodiversity•Retains stormwater, relieves downstream sewers•Sequesters CO2

•More maintenance

Relational Complexity (organizational)•Local and distant effects•Temporal effects affecting planning•Who benefits?•Who manage the benefits/disbenefits?•Agency and owner interactions

Green Roofs



Interactions with the Urban System

Implications

Soil Moisture Low High SaturationAir temperature Low High Low High Low HighWater storage

capacity++ +++ + ++ - -

Pollutant trap ++ ++ +++ +++ + +Thermal building

insulation ++ ++ ++ ++ + +

Thermal exchange + ++ + +++ - +

Carbon sequestration

+ + ++ +++ - -

Noise attenuation +++ +++ ++ ++ + +

Biodiversity Cold and drought resistant

ecosystem

Drought resistant

ecosystem

Cold resistant ecosystem

Multiple species

- -

Visual amenity + ++ +++ +++ - -

Potential functions of green roofs under different conditions.+, ++, +++ denote the potential level of functions from low to high; - denotes small or zero functioning



Benefit intensity- based on the cumulative spatial distribution of benefits

Developing benefit profiles and overall benefit intensity


Case Study, Johnson Creek Portland, Oregon USA


Foster Road Floodplain Restoration - Before


Foster Road Floodplain Restoration - After


Spatial distribution of benefits in a GIS tool

Project extent

Avoided floodAccessibility to green space


Traffic impacts


Noise propagation

LANDSAT-based analysis

Summer Winter

Cooler micro-climate

Warmer micro-climate

Time-slide example: 2013


Overlay of physical benefits of site

Location of benefit occurrences

Intensity of benefit occurrences

Beneficiaries


Other functions

•Visualise EPA SWMM model

•Run SWMM model and display

results in QGIS


Conclusion

•Multiple potential Green Infrastructure benefits

•Toolkit based on existing tools can be used to analyse spatial and temporal

distribution of those benefits

• Next step:

•Fully integrate functions into the toolkit

•Analyse GI benefits under the blue and green conditions

•Analyse GI benefits for different scales

•Use Multi-criteria Analysis to aggregated the benefits

Thank You for Listening

Blue Green Toolkit

Environment

Transcript of Blue Green Toolkit