Water quantity investigation of simulated green roofs in a tropical climate: influence of vegetation composition

E&S Engineering and Science Pub Date : 2019-07-17 DOI:10.18607/ES201988046

Thaisa Camila Vacari, Jocilan Rodrigues Lara, Z. M. Lima, E. B. Morais

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引用次数: 3

Abstract

Green roofs are recognized as a sustainable infrastructure to improve the environmental quality of cities. Among many benefits, green roofs reduce the rate and volume of runoff helping to improve rainwater management. This study investigated the runoff retention capacity of three pilot extensive green roof assemblies with different vegetation (grass, shrub and intercropping of the two plants). Rainwater runoff data were collected for 18 rainfall events that ranged from a minimum of 1.6 mm to a maximum of 157.9 mm. Average precipitation event retention efficiencies were 46.7, 59.7 and 61.6% for intercropped, shrub and grass green roofs, respectively, while the annual runoff retention rates were 43.8, 57.3 and 59.7%. The difference in retention rates for the green roofs with different vegetation was not statistically significant. The rainfall intensity influenced the retention rates, with the highest retentions for small events (<10.0 mm) followed by medium (10.0-24.9 mm). Retention was found to correspond significantly to rainfall depths. On the other hand, regression analysis failed to provide a relationship between retention and antecedent dry weather period (ADWP). The organic soil used as substrate appears to be the deciding factor for rainwater retention.

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热带气候下模拟绿化屋顶水量调查:植被组成的影响

绿色屋顶被认为是一种可持续的基础设施，可以改善城市的环境质量。在许多好处中，绿色屋顶减少了径流的速度和体积，有助于改善雨水管理。本研究调查了三种不同植被(草、灌木和两种植物的间作)的试点广泛绿色屋顶组件的径流保留能力。收集了18次降雨事件的雨水径流数据，最小降雨量为1.6 mm，最大降雨量为157.9 mm。间作、灌丛和草木绿化屋顶的平均降水事件保留效率分别为46.7%、59.7%和61.6%，年径流保留率分别为43.8%、57.3%和59.7%。不同植被对绿化屋顶的保留率差异无统计学意义。降雨强度对滞留率有影响，小事件(<10.0 mm)的滞留率最高，其次是中事件(10.0 ~ 24.9 mm)。截留量与降雨深度显著相关。另一方面，回归分析未能提供保墒与前期干旱期(ADWP)之间的关系。作为基质的有机土壤似乎是蓄雨的决定性因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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E&S Engineering and Science

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