Design frequently involves making tradeoffs to obtain the“optimal”solution to a design problem,often using intuition or past experience as a guide.Since vegetated roofing is a relatively complex and comparatively ne...Design frequently involves making tradeoffs to obtain the“optimal”solution to a design problem,often using intuition or past experience as a guide.Since vegetated roofing is a relatively complex and comparatively new technology to many practitioners,a rational,explicit method to help organize and rank the tradeoffs made during the design process is needed.This research comprises the creation of a framework diagramming the decision process involved in the selection of vegetated roofi ng systems.Through literature review,case studies and interviews with experts,the available knowledge is captured and organized to determine the critical parameters affecting design decisions.Six important evaluative categories are identifi ed and parameters within these categories are addressed in the context of a decision support system for green roof designers.A summation of the total importance of the advantages represented by each alternative is used to determine the most feasible green roof system for a particular project.The framework is demonstrated and compared with green roof designers’decision-making processes and conclusions are drawn regarding its effectiveness.展开更多
Now in its first official year of operation,Philadelphia’s“Green City,Clean Waters”program addresses the problem of stormwater flow into sewer systems that then overflow,polluting streams and rivers.Four institutio...Now in its first official year of operation,Philadelphia’s“Green City,Clean Waters”program addresses the problem of stormwater flow into sewer systems that then overflow,polluting streams and rivers.Four institutional projects by SaylorGregg Architects are useful case studies of stormwater management techniques in urban buildings.Subsurface storage beds,extensive and intensive vegetated roofs,and other effective means of capturing stormwater and reducing heat islands in urban development are discussed.展开更多
The German FLL Guidelines for green roofs are designed to inform about state-of-the-art performance expectations for green roofs.North America is experiencing steady growth in the green roof market and has no single-s...The German FLL Guidelines for green roofs are designed to inform about state-of-the-art performance expectations for green roofs.North America is experiencing steady growth in the green roof market and has no single-source set of standards or guidelines;therefore there is a need to identify what type of guidance may be lacking.Seven domains of knowledge from the FLL Guidelines are compared to similar areas of content in North American documents.It was found that although there are several North American green roof guidelines in use,compared to the FLL Guidelines there are areas where knowledge is lacking:guidance for compatibility of system components,slope application,filter fabrics,root barriers,surface and subsurface drainage,growth media,and erosion control,as well as standards or postconstruction testing requirements for fabrics,bulk density of growth media,root barrier performance,drainage media,and growth media.A case study of the Chicago City Hall green roof examines its content compliance with FLL performance standards.Recommendations for further advancement of North American guidelines include the need for more collaborative research and development in efforts to advance existing and new guidelines across ecoregions.展开更多
Background:A green roof is a man-made ecosystem created when a rooftop is covered with substrate and vegetation.Although green roof ecosystems(GREs)are able to provide ecosystem services,there is currently no assessme...Background:A green roof is a man-made ecosystem created when a rooftop is covered with substrate and vegetation.Although green roof ecosystems(GREs)are able to provide ecosystem services,there is currently no assessment tool available to specifically evaluate this.Therefore,the aim of this study was to develop a rapid assessment checklist(RAC)to assess GRE services(GRES),which was developed and tested on 10 green roofs in Bangkok,Thailand.Results:The RAC consisted of 46 proxy indicators(33 qualitative and 13 quantitative indicators)encompassing various aspects of GRESs.The GRES values or scores varied according to structural differences in the green roofs.The average score(from a maximum of 100)of total ecosystem services was 61±7,which could be inferred as a good performance in ecosystem service provision.The highest scores were obtained from the regulating services at 68±7.The lowest average score was 53±11 from the provisioning services.Conclusions:The RAC was able to evaluate the levels of GRES provided by the selected green roofs,enabling the meaningful comparison of their potential capability to provide GRES.Therefore,this RAC could be an innovative tool for evaluation of four categories of GRES.展开更多
文摘Design frequently involves making tradeoffs to obtain the“optimal”solution to a design problem,often using intuition or past experience as a guide.Since vegetated roofing is a relatively complex and comparatively new technology to many practitioners,a rational,explicit method to help organize and rank the tradeoffs made during the design process is needed.This research comprises the creation of a framework diagramming the decision process involved in the selection of vegetated roofi ng systems.Through literature review,case studies and interviews with experts,the available knowledge is captured and organized to determine the critical parameters affecting design decisions.Six important evaluative categories are identifi ed and parameters within these categories are addressed in the context of a decision support system for green roof designers.A summation of the total importance of the advantages represented by each alternative is used to determine the most feasible green roof system for a particular project.The framework is demonstrated and compared with green roof designers’decision-making processes and conclusions are drawn regarding its effectiveness.
文摘Now in its first official year of operation,Philadelphia’s“Green City,Clean Waters”program addresses the problem of stormwater flow into sewer systems that then overflow,polluting streams and rivers.Four institutional projects by SaylorGregg Architects are useful case studies of stormwater management techniques in urban buildings.Subsurface storage beds,extensive and intensive vegetated roofs,and other effective means of capturing stormwater and reducing heat islands in urban development are discussed.
文摘The German FLL Guidelines for green roofs are designed to inform about state-of-the-art performance expectations for green roofs.North America is experiencing steady growth in the green roof market and has no single-source set of standards or guidelines;therefore there is a need to identify what type of guidance may be lacking.Seven domains of knowledge from the FLL Guidelines are compared to similar areas of content in North American documents.It was found that although there are several North American green roof guidelines in use,compared to the FLL Guidelines there are areas where knowledge is lacking:guidance for compatibility of system components,slope application,filter fabrics,root barriers,surface and subsurface drainage,growth media,and erosion control,as well as standards or postconstruction testing requirements for fabrics,bulk density of growth media,root barrier performance,drainage media,and growth media.A case study of the Chicago City Hall green roof examines its content compliance with FLL performance standards.Recommendations for further advancement of North American guidelines include the need for more collaborative research and development in efforts to advance existing and new guidelines across ecoregions.
基金This research was supported by the 90th Anniversary of Chulalongkorn University,Rachadapisek Sompote Fund(GCUGR1125603028D No.25)RP was financially supported by the Development and Promotion of Science and Technology Talents Scholarship.
文摘Background:A green roof is a man-made ecosystem created when a rooftop is covered with substrate and vegetation.Although green roof ecosystems(GREs)are able to provide ecosystem services,there is currently no assessment tool available to specifically evaluate this.Therefore,the aim of this study was to develop a rapid assessment checklist(RAC)to assess GRE services(GRES),which was developed and tested on 10 green roofs in Bangkok,Thailand.Results:The RAC consisted of 46 proxy indicators(33 qualitative and 13 quantitative indicators)encompassing various aspects of GRESs.The GRES values or scores varied according to structural differences in the green roofs.The average score(from a maximum of 100)of total ecosystem services was 61±7,which could be inferred as a good performance in ecosystem service provision.The highest scores were obtained from the regulating services at 68±7.The lowest average score was 53±11 from the provisioning services.Conclusions:The RAC was able to evaluate the levels of GRES provided by the selected green roofs,enabling the meaningful comparison of their potential capability to provide GRES.Therefore,this RAC could be an innovative tool for evaluation of four categories of GRES.
