Experimental and numerical investigation on runoff reduction and water stress of green roofs with varying soil depth and saturated water content under dry–wet cycles

• Autorzy: Ma Ming , Wang Jun , Garg Ankit , Mei Guoxiong

Identyfikatory

DOI

10.1007/s11600-022-00918-0

• Języki publikacji: EN

Abstrakty

EN

The soil layer is the most important structure for green roof runoff reduction and vegetation growth. The mechanisms of runoff reduction and water content of green roofs with varying soil depth and saturated water content (θs) under dry–wet cycles are not well understood. Field and numerical methodologies were adopted for investigation in this study. The green roof drainage and water content were observed for a given period (i.e., August 2020 to July 2021). A numerical model was calibrated and validated for the analysis of annual runoff reduction and water stress with different θs and soil depths. Based on climate in southern China, the green roof's annual runoff reduction rate (ARR) (100 mm soil) was 33%, and the annual water stress was 168 days. With an increase in θs by 0.1 mm3 /mm3 , the ARR of green roofs increased by an average of 5% while the water stress was reduced by an average of 32 days. With an increase in soil depth by 100 mm, the average ARR increased by 4%, whereas the average water stress was reduced by 6 days. It was shown that the runoff reduction is enhanced with an increasing θs and soil depth during a longer antecedent dry weather period, but it had no significant effect on runoff reduction during back-to-back rainfall events. Increasing soil depth had no significant improvement in runoff reduction and water stress beyond a certain point. Consequently, the optimal structural configuration of green roofs was considered as a soil depth of 200 mm (θs of 0.5 mm3 /mm3 ).

Słowa kluczowe

EN

green roofs; stormwater management; runoff reduction; water stress; HYDRUS-1D

PL

zielone dachy; Zarządzanie deszczówką; redukcja spływu; stres wodny; HYDRUS-1D

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2023
• Tom: Vol. 71, no. 2
• Strony: 893--903
• Opis fizyczny: Bibliogr. 34 poz.

Twórcy

autor

Ma Ming

• Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

autor

Wang Jun

• Key Laboratory of Disaster Prevention and Structural Safety of a Ministry of Education, Guangxi Key Laboratory of Disaster Prevention and Structural Safety, Guangxi Laboratory On the Study of Coral Reefs in the South China Sea, College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China

autor

Garg Ankit

• Key Laboratory of Disaster Prevention and Structural Safety of a Ministry of Education, Guangxi Key Laboratory of Disaster Prevention and Structural Safety, Guangxi Laboratory On the Study of Coral Reefs in the South China Sea, College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
• Guangdong Engineering Center for Structure Safety and Health Monitoring, Shantou University, Shantou 515063, China

autor

Mei Guoxiong

• Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).