TY - JOUR
T1 - Hydrological Performance of Green Roof Systems
T2 - A Numerical Investigation
AU - Kim, Sang Yeob
AU - Na, Wooyoung
AU - Jun, Changhyun
AU - Seo, Hyungjoon
AU - Kim, Yongmin
N1 - Publisher Copyright:
Copyright © 2021 Kim, Na, Jun, Seo and Kim.
PY - 2021/12/8
Y1 - 2021/12/8
N2 - Green roof systems could help reduce peak discharge and retain rainwater in urban areas. The objective of this study was to investigate the hydrological behavior of a green roof system by using the SEEP/W model. The rainfall-runoff relationship within the green roof system was simulated and the results were compared with actual data from a test bed for green roof systems to verify the applicability of SEEP/W. Then, the verified SEEP/W model was used to simulate the green roof system by varying four factors (soil type, rainfall intensity, substrate depth, and green roof slope) to explore the hydrological performance through the peak discharge to rainfall intensity (PD/RI) ratio and the rain water retention rate. The results show that the model presents slightly faster and greater peak time and peak discharge values, respectively, as compared to the observational data. This is attributed to the vegetation conditions in the real green roof system. However, it is also shown that the SEEP/W model can be used to design green roof systems and evaluate their hydrological behavior because of its modeling efficiency. Thus, the SEEP/W model can be used to reliably design and manage green roof systems by further considering the vegetation conditions and water flow dynamics. Furthermore, it would be desirable to consider additional factors, such as vegetation and an insulating pebble layer, in the design and management of green roofs in future work.
AB - Green roof systems could help reduce peak discharge and retain rainwater in urban areas. The objective of this study was to investigate the hydrological behavior of a green roof system by using the SEEP/W model. The rainfall-runoff relationship within the green roof system was simulated and the results were compared with actual data from a test bed for green roof systems to verify the applicability of SEEP/W. Then, the verified SEEP/W model was used to simulate the green roof system by varying four factors (soil type, rainfall intensity, substrate depth, and green roof slope) to explore the hydrological performance through the peak discharge to rainfall intensity (PD/RI) ratio and the rain water retention rate. The results show that the model presents slightly faster and greater peak time and peak discharge values, respectively, as compared to the observational data. This is attributed to the vegetation conditions in the real green roof system. However, it is also shown that the SEEP/W model can be used to design green roof systems and evaluate their hydrological behavior because of its modeling efficiency. Thus, the SEEP/W model can be used to reliably design and manage green roof systems by further considering the vegetation conditions and water flow dynamics. Furthermore, it would be desirable to consider additional factors, such as vegetation and an insulating pebble layer, in the design and management of green roofs in future work.
KW - green roof systems
KW - hydrological performance
KW - rainfall-runoff
KW - SEEP/W model
KW - urban area
UR - http://www.scopus.com/inward/record.url?scp=85121577386&partnerID=8YFLogxK
U2 - 10.3389/fenvs.2021.806697
DO - 10.3389/fenvs.2021.806697
M3 - Article
AN - SCOPUS:85121577386
SN - 2296-665X
VL - 9
JO - Frontiers in Environmental Science
JF - Frontiers in Environmental Science
M1 - 806697
ER -
