Many Low Impact Developments (LIDs) have recently been developed as a sustainable integrated strategy for managing the quantity and quality of stormwater and surrounding amenities. Previous research showed that green ...Many Low Impact Developments (LIDs) have recently been developed as a sustainable integrated strategy for managing the quantity and quality of stormwater and surrounding amenities. Previous research showed that green roof is one of the most promising LIDs for slowing down rainwater, controlling rainwater volume, and enhancing rainwater quality by filtering and leaching contaminants from the substrate. However, there is no guideline for green roof design in Malaysia. Hence, Investigating the viability of using green roofs to manage stormwater and address flash flood hazards is urgently necessary. This study used the Storm Water Management Model (SWMM) to evaluate the effectiveness of green roof in managing stormwater and improving rainwater quality. The selected study area is the multistory car park (MSCP) rooftop at Swinburne University of Technology Sarawak Campus. Nine green roof models with different configurations were created. Results revealed that the optimum design of a green roof is 100 mm of berm height, 150 mm of soil thickness, and 50 mm of drainage mat thickness. With the ability to reduce runoff generation by 26.73%, reduce TSS by 89.75%, TP by 93.07%, TN by 93.16%, and improved BOD by 81.33%. However, pH values dropped as low as 5.933 and became more acidic due to the substrates in green roof. These findings demonstrated that green roofs improve water quality, able to temporarily store excess rainfall and it is very promising and sustainable tool in managing stormwater.展开更多
This manuscript is an attempt to demonstrate effectiveness of nature-based solutions (NBS) and measures to reduce risk of flooding and environmental impact in urban settings. The nature-based solutions (NBS) were asse...This manuscript is an attempt to demonstrate effectiveness of nature-based solutions (NBS) and measures to reduce risk of flooding and environmental impact in urban settings. The nature-based solutions (NBS) were assessed as scenarios from experience of urban storm drainage and sewerage systems based on practices that improve urban water management through modelling using urban stormwater management model (SWMM). The model has been applied in a typical urban environment in the second city in Botswana, the City of Francistown, which has a population of more than one hundred thousand. By considering the 2-yr and 10-year storm events in a calibrated SWMM, NBS scenarios from a mix of low impact and drainage measures were considered. The considered NBS scenarios were used to determine their effectiveness in terms of reducing and controlling peak runoff, flood volumes, infiltration and evapotranspiration in the study area, which are vital in assessing the opportunity and challenge for sustainable management of water resources and associated tradeoff of investments in the urban contexts. The study demonstrates the usefulness of implementing effective measures for achieving NBS in urban context and possibility of outscaling at basin and regional levels.展开更多
受全球气候变暖的影响,我国西北干旱半干旱地区夏季暴雨发生的频率和强度逐年提高。选取该地区排水系统完善但具有洪涝风险的坡地校园,应用暴雨洪水管理模型(Storm Water Management Model,SWMM)分析暴雨情景下校园淹没情况,并据此制定...受全球气候变暖的影响,我国西北干旱半干旱地区夏季暴雨发生的频率和强度逐年提高。选取该地区排水系统完善但具有洪涝风险的坡地校园,应用暴雨洪水管理模型(Storm Water Management Model,SWMM)分析暴雨情景下校园淹没情况,并据此制定海绵化改造方案。研究发现,暴雨情景下学校地表径流主要分布在3条南北干道上。根据模型分析结果可知,设计长历时降雨情景下,超载管段数量为52个;设计短历时降雨情景下,超载管段数量最多为194个,潜在洪涝风险很大。秉持“源头控制、客水引流、中途滞蓄、末端排放”的基本思路制定海绵化改造方案,包括设计屋顶花园21处、雨水花园19处、植草沟14处、透水铺装34处和下沉式绿地38处。海绵化改造方案在长历时降雨情景下能够达到83.02%的年径流总量控制率,预期降低洪涝危害显著。研究结果可为西北坡地校园海绵化改造实践与雨水生态景观构建提供参考。展开更多
文摘Many Low Impact Developments (LIDs) have recently been developed as a sustainable integrated strategy for managing the quantity and quality of stormwater and surrounding amenities. Previous research showed that green roof is one of the most promising LIDs for slowing down rainwater, controlling rainwater volume, and enhancing rainwater quality by filtering and leaching contaminants from the substrate. However, there is no guideline for green roof design in Malaysia. Hence, Investigating the viability of using green roofs to manage stormwater and address flash flood hazards is urgently necessary. This study used the Storm Water Management Model (SWMM) to evaluate the effectiveness of green roof in managing stormwater and improving rainwater quality. The selected study area is the multistory car park (MSCP) rooftop at Swinburne University of Technology Sarawak Campus. Nine green roof models with different configurations were created. Results revealed that the optimum design of a green roof is 100 mm of berm height, 150 mm of soil thickness, and 50 mm of drainage mat thickness. With the ability to reduce runoff generation by 26.73%, reduce TSS by 89.75%, TP by 93.07%, TN by 93.16%, and improved BOD by 81.33%. However, pH values dropped as low as 5.933 and became more acidic due to the substrates in green roof. These findings demonstrated that green roofs improve water quality, able to temporarily store excess rainfall and it is very promising and sustainable tool in managing stormwater.
文摘This manuscript is an attempt to demonstrate effectiveness of nature-based solutions (NBS) and measures to reduce risk of flooding and environmental impact in urban settings. The nature-based solutions (NBS) were assessed as scenarios from experience of urban storm drainage and sewerage systems based on practices that improve urban water management through modelling using urban stormwater management model (SWMM). The model has been applied in a typical urban environment in the second city in Botswana, the City of Francistown, which has a population of more than one hundred thousand. By considering the 2-yr and 10-year storm events in a calibrated SWMM, NBS scenarios from a mix of low impact and drainage measures were considered. The considered NBS scenarios were used to determine their effectiveness in terms of reducing and controlling peak runoff, flood volumes, infiltration and evapotranspiration in the study area, which are vital in assessing the opportunity and challenge for sustainable management of water resources and associated tradeoff of investments in the urban contexts. The study demonstrates the usefulness of implementing effective measures for achieving NBS in urban context and possibility of outscaling at basin and regional levels.
文摘受全球气候变暖的影响,我国西北干旱半干旱地区夏季暴雨发生的频率和强度逐年提高。选取该地区排水系统完善但具有洪涝风险的坡地校园,应用暴雨洪水管理模型(Storm Water Management Model,SWMM)分析暴雨情景下校园淹没情况,并据此制定海绵化改造方案。研究发现,暴雨情景下学校地表径流主要分布在3条南北干道上。根据模型分析结果可知,设计长历时降雨情景下,超载管段数量为52个;设计短历时降雨情景下,超载管段数量最多为194个,潜在洪涝风险很大。秉持“源头控制、客水引流、中途滞蓄、末端排放”的基本思路制定海绵化改造方案,包括设计屋顶花园21处、雨水花园19处、植草沟14处、透水铺装34处和下沉式绿地38处。海绵化改造方案在长历时降雨情景下能够达到83.02%的年径流总量控制率,预期降低洪涝危害显著。研究结果可为西北坡地校园海绵化改造实践与雨水生态景观构建提供参考。
