A modeling study of the interflow in the green roof

Autor: Haowen Xie, Jun Liu
Rok vydání: 2020
Předmět:
Zdroj: Urban Forestry & Urban Greening. 54:126760
ISSN: 1618-8667
DOI: 10.1016/j.ufug.2020.126760
Popis: Green Roofs (GRs) are a form of sustainable, low impact development. They can reduce peak stormwater runoff and improve the quality of the runoff from buildings and developments. The water captured by the GRs can be used as a resource for irrigation and domestic water by installing rainwater tanks under the drainpipe of the roof. However, few studies have focused on the relationship between GRs modelling and the management or design for rainwater tanks to avoid roof runoff. In this study, in order to give some useful advices to optimize the management or design of rainwater tanks, the three models were tested to get the one that best reflects the truth of GRs. In this part, a one-reservoir conceptual interflow model (CI-MODEL) considering the interflow of the GRs was used to predict the performance of GRs, and been compared by the Storm Water Management Model (SWMM), and the physical process model (HYDRUS-1D) based on observed rainfall and runoff data. After the comparison from 0.4 to 2.0 mm/min rainfall intensities, it was concluded that the CI-MODEL is a useful tool in modelling GRs. According to those conclusions of CI-MODEL, some advices could been given to affect the management and design of rainwater tanks to limit the waste of runoffs that can be reused. (1) When it rains, the runoff start time is short. So that, the wisest thing is to empty rainwater tanks before it rains. If this is difficult, it is acceptable to empty it within 25 min of the onset of rain; (2) The volume of the rainwater tanks is better larger than 0.045 m3 for per unit area (m2) of GRs. Besides, this value is calculated by the area and depth of the GRs in this study.
Databáze: OpenAIRE
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