Towards a generic rainfall-runoff model for green roofs.
A simple conceptual model for green roof hydrological processes is shown to reproduce monitored data, both during a storm event, and over a longer continuous simulation period. The model comprises a substrate moisture storage component and a transient storage component. Storage within the substrate represents the roof's overall stormwater retention capacity (or initial losses). Following a storm event the retention capacity is restored by evapotranspiration (ET). However, standard methods for quantifying ET do not exist. Monthly ET values are identified using four different approaches: analysis of storm event antecedent dry weather period and initial losses data; calibration of the ET parameter in a continuous simulation model; use of the Thornthwaite ET formula; and direct laboratory measurement of evaporation. There appears to be potential to adapt the Thornthwaite ET formula to provide monthly ET estimates from local temperature data. The development of a standardized laboratory test for ET will enable differences resulting from substrate characteristics to be quantified.
Kasmin
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H
Department of Civil and Structural Engineering, The University of Sheffield, Mappin Street, Sheffield S13JD, UK. h.kasmin@sheffield.ac.uk
Stovin
V R
VR
Hathway
E A
EA
D001108:Architecture; D004739:England; D004784:Environmental Monitoring / Q000379:methods; D018526:Plant Transpiration / Q000502:physiology*; D006109:Poaceae; D011891:Rain; D012621:Seasons; D013227:Steam / Q000032:analysis; D014495:Universities; D014872:Water Movements
D013227:Steam