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Melbourne

Greater Melbourne contains 31 municipalities, in an affluent multi-cultural metropolis, doubling in size in 30 years.

Large suburban-peri-urban areas are scattered, car dependent, vulnerable to drought and wildfire, and in certain areas river flooding. Social polarization and middle class vulnerability may be on the increase. Peri-rural areas suffer from out-migration, dependency on agriculture and corporate landholdings, declining services.

Climate hazards generally include wildfires and all forms of flooding. Coastal areas are at risk from sea level rise and coastal storm hazards on critical infrastructure.

Melbourne region

(The map here shows circles of 20, 40 & 60km radius, a rough approximation to the gravity field).

Peri-urban-climate scoping

Using visual thinking for the deeper complexity of peri-urban-climate interactions, here are two images. The first is a flip-chart sketch and overview of the problem. The second is a 'causal mapping' from the Peri-cene Framework, with basic problems and pathways. For more see the Melbourne pathways:

System scoping drawing

System scoping diagram


Causal analysis

This puts the mapping above into an analytic for with a summary table. For more see the Melbourne analysis:

(In advance of consultation this version is a comparison of our two detailed case studies).

Policy lab - causal effects


Climate Hazard

(World Bank data profile for Victoria)

Extreme heat                                                - Medium
Wildfire                                                          - High
Water scarcity                                              - Low
River flood                                                    - High
Urban flood                                                  - High
Coastal flood                                                - High
Cyclone                                                          - Low
Tsunami                                                         - High
Landslide                                                       - Medium
Earthquake                                                   - Medium
Volcano                                                         - Medium



Spatial mapping

The Peri-cene takes a practical approach to the complexity of peri-urban-climate interactions. The base-maps here build on the JRC-GHSL (Global Human Settlements Layer) system of urban mapping with 1 km2 cells http://ghsl.jrc.ec.europa.eu . In this way the peri-urban definition and mapping is not a final answer, but the start of the discussion. For more on the questions of 'where is the peri-urban?' and 'how is it changing?' download the D3-1 report.


Population density map

This shows three population density bands: 0-50, 50-125, and 125-300 persons/km2: (transparent for open land, and then green and yellow cells). These are in different proximities to the main urban centres, for the moment defined by distances (from the urban centre), of 0-20, 20-40, and 40-60km: titled 'near-urban', 'near-urban: further urban: and ex-urban / peri-rural'.

GHSL_Melbourne_Pop1km_2015


Population change map

This shows the effects of peri-urban change and urban expansion, from 1990 to 2015.

  • 'Peri-urbanization': moving from rural to peri-urban
  • 'Densification': moving from peri-urban to urban
  • 'Urbanization': moving from rural directly to urban

GHSL_Melbourne_Pop_change_1990-2015


Climate projections: coastal flooding

Including sea level rise, tidal, and storm surge effects, this is a 'reasonable worst case scenario' for 2080, with reduced policy and pessimistic modelling. This is based on the mapping from www.climate-central.org

GHSL_Melbourne_Coastal_FloodRisk_2080



Climate projections: temperature effects

(Top & middle parts include):

(Lower part includes):

Melbourne climate projections temp effects larger

Sources:

IPCC-WG1 2016

NOAA

Global Forest Watch

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