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Study on riparian shading envelope for wetlands to create desirable urban bioclimates

Mohammed Shahjahan, Abu Taib and Ahmed, Khandaker Shabbir and Said, Ismail (2020) Study on riparian shading envelope for wetlands to create desirable urban bioclimates. Atmosphere, 11 (12). p. 1348. ISSN 2073-4433


Official URL: http://dx.doi.org/10.3390/atmos11121348


Climate change and rapid urbanization are adversely affecting the urban environment by exacerbating the widely reported urban heat island effect in Dhaka, Bangladesh. Two wetland areas with variable riparian shadings in the warm-humid conditions of urban Dhaka were investigated through field campaigns on microclimatic parameters for their cooling potential on the surrounding urban fabric. It was observed that an inversion layer of fully saturated air develops over the water surface of wetland, suppressing evaporation from the wetland water surface layer, which was effectively reducing the heat exchange between the water surface and the air layer above it through its action as an insulating vapor blanket. Due to this effect, the wetland was unable to render as a source of coolth for the surrounding overheated urban area. This effect of the inversion layer was more pronounced in the urban wetland without riparian shading either by the urban form or tree canopy. A multiphysics simulation study conducted on the selected urban wetlands indicates the effect of differential shading pattern on the relation between fetch and inversion layer thickness. This research hypothesizes that the wetland can act as an urban adaption measure against the urban heat island effect by potentially transforming them into an urban cooling island (UCI) towards a favorable urban bioclimate.

Item Type:Article
Uncontrolled Keywords:Inversion layer, Riparian shading
Subjects:G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions:Built Environment
ID Code:93042
Deposited By: Widya Wahid
Deposited On:07 Nov 2021 13:59
Last Modified:07 Nov 2021 13:59

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