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Dhaka

Dhaka, the capital and largest city of Bangladesh, is the ninth largest city in the world. A population of 8.9 million residents live in the city limits, and over 21 million reside within the Greater Dhaka Area.

Dhaka is the financial, commercial, and entertainment capital of Bangladesh, accounting for up to 35% of Bangladesh's economy.

The city is divided into 130 wards and 725 mohallas (districts).

Dhaka 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 City-region 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 City-region 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 Dhaka)

Extreme heat                                                - High
Wildfire                                                          - High
Water scarcity                                              - Medium
River flood                                                    - High
Urban flood                                                  - High
Coastal flood                                                - High
Cyclone                                                          - High
Tsunami                                                         - No data
Landslide                                                       - Low
Earthquake                                                   - Medium
Volcano                                                         - No data



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_Dhaka_Pop1km_2015.



Population change map

(coming soon)


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_Dhaka_Flood_1km_2015


Climate projections: river flooding

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_Dhaka_Riverine_Flood_2080

Climate projections: temperature effects

Top six images show annual, summer, and winter temperature, and precipitation changes. Bottom left shows projected temperature changes for a range of scenarios by 2100. Centre bottom shows daily temperature events within the top 0.1% recorded local temperatures from 1979 to 2017. Bottom right shows the 2010 forest cover.

Dhaka climate projections temp effects

Sources:

IPCC-WG1 2016

NOAA

Global Forest Watch

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