Study on riparian shading envelope for wetlands to create desirable urban bioclimates
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 campaig...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2020
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| Online Access: | http://eprints.utm.my/93042/1/IsmailSaid2020_StudyonRiparianShadingEnvelopeforWetlands.pdf |
| _version_ | 1796865543690518528 |
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| author | Mohammed Shahjahan, Abu Taib Ahmed, Khandaker Shabbir Said, Ismail |
| author_facet | Mohammed Shahjahan, Abu Taib Ahmed, Khandaker Shabbir Said, Ismail |
| author_sort | Mohammed Shahjahan, Abu Taib |
| collection | ePrints |
| description | 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. |
| first_indexed | 2024-03-05T20:58:37Z |
| format | Article |
| id | utm.eprints-93042 |
| institution | Universiti Teknologi Malaysia - ePrints |
| language | English |
| last_indexed | 2024-03-05T20:58:37Z |
| publishDate | 2020 |
| publisher | MDPI AG |
| record_format | dspace |
| spelling | utm.eprints-930422021-11-07T05:59:43Z http://eprints.utm.my/93042/ Study on riparian shading envelope for wetlands to create desirable urban bioclimates Mohammed Shahjahan, Abu Taib Ahmed, Khandaker Shabbir Said, Ismail GE Environmental Sciences 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. MDPI AG 2020 Article PeerReviewed application/pdf en http://eprints.utm.my/93042/1/IsmailSaid2020_StudyonRiparianShadingEnvelopeforWetlands.pdf 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 http://dx.doi.org/10.3390/atmos11121348 |
| spellingShingle | GE Environmental Sciences Mohammed Shahjahan, Abu Taib Ahmed, Khandaker Shabbir Said, Ismail Study on riparian shading envelope for wetlands to create desirable urban bioclimates |
| title | Study on riparian shading envelope for wetlands to create desirable urban bioclimates |
| title_full | Study on riparian shading envelope for wetlands to create desirable urban bioclimates |
| title_fullStr | Study on riparian shading envelope for wetlands to create desirable urban bioclimates |
| title_full_unstemmed | Study on riparian shading envelope for wetlands to create desirable urban bioclimates |
| title_short | Study on riparian shading envelope for wetlands to create desirable urban bioclimates |
| title_sort | study on riparian shading envelope for wetlands to create desirable urban bioclimates |
| topic | GE Environmental Sciences |
| url | http://eprints.utm.my/93042/1/IsmailSaid2020_StudyonRiparianShadingEnvelopeforWetlands.pdf |
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