Hydrological performance of modular-tray green roof systems for increasing the resilience of mega-cities to climate change

Loiola, Claudia; Mary, Wellington; Silva, Luciene Pimentel da

doi:10.1016/j.jhydrol.2018.01.004

Cited by 52 publications

(34 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Productive and intensive substrates showed no statistically significant differences between vegetated and non-vegetated modules. Our results do not coincide with some recent research in tropical climates in which non-vegetated GRs were observed to be more efficient than vegetated GRs [44].…”

Section: Effect Of Hydrological Variables On Water Retention Efficiencycontrasting

confidence: 99%

Effect of Green Roof Configuration and Hydrological Variables on Runoff Water Quantity and Quality

Ferrans

Rey

Pérez

et al. 2018

Water

View full text Add to dashboard Cite

Green roofs (GRs) are a feasible solution for mitigating increased runoff volumes in urban areas. Though many studies have focused their analysis on the quantity and quality of GR runoff, with respect to the relevance of specific site conditions in GR performance, the information gathered for the tropical Andes is not sufficient. This study assessed the hydrological performance and runoff water quality of 12 green roof modular systems located at the Universidad de los Andes campus (Bogotá, Colombia). Based on 223 rainfall events spanning a 3-year period, average rainfall retention was 85% (coefficient of variation = 29%). t-tests, the Welch Test, multiple linear regressions, and correlation analysis were performed in order to assess the potential effect of air temperature, substrate type, vegetation cover, relative humidity, antecedent dry weather period (ADWP), rainfall duration, and rainfall maximum intensity. In some cases, GR design variables (i.e., substrate type and vegetation cover) were found to be significant for describing rainfall retention efficiencies and, depending on the GR type, some hydrological variables were also correlated with rainfall retention. Rainfall and GR runoff from 12 rainfall events were also monitored for total Kjeldahl nitrogen (TKN), nitrates, nitrites, ammonia, total phosphorus (TP), phosphates, pH, total dissolved solids (TDS), total suspended solids (TSS), color, turbidity, biological oxygen demand (BOD), chemical oxygen demand (COD), total coliforms, metals (i.e., zinc, copper, nickel, lead, selenium, aluminum, barium, boron, calcium, strontium, iron, lithium, magnesium, manganese, potassium, sodium), and polyaromatic hydrocarbons (PAHs). The results obtained confirmed that GR systems have the ability to neutralize pH, but are a source of the rest of the aforementioned parameters, excluding PAHs (with concentrations below detection limits), ammonia, TSS, selenium and lithium, where differences with control cases (rainfall and plastic panel runoff) were not statistically significant. Substrate type, event size, and rainfall regime are relevant variables for explaining runoff water quality.

show abstract

Section: Effect Of Hydrological Variables On Water Retention Efficiencycontrasting

confidence: 99%

Effect of Green Roof Configuration and Hydrological Variables on Runoff Water Quantity and Quality

Ferrans

Rey

Pérez

et al. 2018

Water

View full text Add to dashboard Cite

show abstract

“…This is confirmed by several studies showing that the fraction of water retained decreases as the event sum precipitation increases [21,26,27] and that retention increases as substrate initial moisture decreases [28]. Significant improvements in detention performance are also found at lower initial substrate moistures [29], mainly due to the effect of initial losses by retention, but possibly also affected by the fact that hydraulic conductivity increases as soil moisture content increases.…”

Section: Climatesupporting

confidence: 69%

Detention and Retention Behavior of Four Extensive Green Roofs in Three Nordic Climate Zones

Johannessen

Muthanna

Braskerud

2018

Water

View full text Add to dashboard Cite

Climate change coupled with increasing urbanization has made extensive green roofs, both for retrofitting and new developments, an attractive way to bring nature back to cities, while managing stormwater. This study has investigated extensive green roof retention and detention performance based on 3-8 years of field data from four Norwegian locations representing typical cold and wet Nordic climates, also comparing several different commercial configurations. Accumulated retention was found to be 11-30% annually and 22-46% in May through October. The performance was found to be strongly dependent in evapotranspiration and less dependent on material storage capacities. Estimates for available storage capacities for precipitation events larger than 5 mm are given and can be useful for design purposes. Median observed peak attenuation compared to the precipitation ranged from 65 to 90% depending on locations and configurations. The event-based approach for evaluating detention was found to be challenging due to the nature of the precipitation in the studied locations. An alternative approach using flow duration curves based on the observed time series was tested and found to give valuable information on runoff patterns from green roofs and to be useful for evaluating green roof performance in relation to local requirements.

show abstract

“…Productive and intensive substrates showed no statistically significant differences between vegetated and non-vegetated modules. Our results do not coincide with some recent research in tropical climates in which non-vegetated GR were observed to be more efficient than vegetated GR [37].…”

Section: Effect Of Vegetation On Water Retention Efficiencycontrasting

confidence: 99%

Effect of Green Roof Configuration and Hydrological Variables on Runoff Water Quantity and Quality

Ferrans¹,

Rey²,

Pérez³

et al. 2018

Preprint

View full text Add to dashboard Cite

This study assessed the hydrological performance and runoff water quality of 12 green roof (GR) modular systems located at the Universidad de los Andes campus (Bogotá, Colombia). Based on 223 rainfall events spanning a 3-year period, average rainfall retention was 85% (SD = 25%). T-tests, Welch Test, multiple linear regressions and correlation analysis were performed in order to assess the potential effect of air temperature, substrate type, vegetation cover, relative humidity, antecedent dry weather period (ADWP), rainfall duration and rainfall maximum intensity. In some cases, GR design variables (i.e. growing media and type of vegetation) were found to be significant for describing rainfall retention efficiencies and, depending on the GR type, some hydrological variables were also correlated with the rainfall retention. Rainfall and GR runoff were monitored for Total Kjeldahl Nitrogen (TKN), Nitrates, Nitrites, Ammonia, Total Phosphorus (TP), Phosphates, pH, Total Dissolved Solids (TDS), Total Suspended Solids (TSS), Color, Turbidity, Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Coliforms, metals and Poliaromatic Hydrocarbons (PAHs). The results obtained confirmed that GR systems have the ability to neutralize pH, but are source of the rest of the aforementioned parameters, excluding PAHs (with concentrations below detection limits), Ammonia, TSS, Se and Li, where differences with reference values (rainfall and plastic panel runoff) were not statistically significant. Substrate type, event size and rainfall regime are relevant variables for explaining runoff water quality.

show abstract

Hydrological performance of modular-tray green roof systems for increasing the resilience of mega-cities to climate change

Cited by 52 publications

References 18 publications

Effect of Green Roof Configuration and Hydrological Variables on Runoff Water Quantity and Quality

Effect of Green Roof Configuration and Hydrological Variables on Runoff Water Quantity and Quality

Detention and Retention Behavior of Four Extensive Green Roofs in Three Nordic Climate Zones

Effect of Green Roof Configuration and Hydrological Variables on Runoff Water Quantity and Quality

Contact Info

Product

Resources

About