Physical parameterization and sensitivity of urban hydrological models: Application to green roof systems

Jiachuan Yang, Zhihua Wang

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Rapid urbanization has emerged as the source of many adverse environmental effects and brings cities to a vulnerable situation under future climate challenges. Green roofs are proven to be an effective solution to alleviate these effects by field observations under a wide range of climate conditions. Recent advances in modeling urban land-atmosphere interactions provide a useful tool in capturing the dynamics of coupled transport of water and energy in urban conies, thus bridge the gap of modeling at city to regional scales. The performance of urban hydrological models depends heavily on the accurate determination of the input parameter space, where uncertainty is ubiquitous. In this paper, we use an advanced Monte Carlo approach, viz. the Subset Simulation, to quantify the sensitivity of urban hydrological modeling to parameter uncertainties. Results of the sensitivity analysis reveal that green roofs exhibit markedly different thermal and hydrological behavior as compared to conventional roofs, due to the modification of the surface energy portioning by well-irrigated vegetation. In addition, statistical predictions of critical responses of green roofs (extreme surface temperature, heat fluxes, etc.) have relatively weak dependence on climatic conditions. The statistical quantification of sensitivity provides guidance for future development of urban hydrological models with practical applications such as urban heat island mitigation.

Original languageEnglish (US)
Pages (from-to)250-263
Number of pages14
JournalBuilding and Environment
Volume75
DOIs
StatePublished - 2014

Fingerprint

Parameterization
Roofs
roof
parameterization
heat
climate
uncertainty
energy
quantification
urbanization
hydrological modeling
heat island
surface energy
climate conditions
Interfacial energy
environmental effect
Sensitivity analysis
modeling
heat flux
Environmental impact

Keywords

  • Green roof
  • Hydrological model
  • Monte carlo simulations
  • Parameter uncertainty
  • Sensitivity
  • Urban heat island

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Environmental Engineering
  • Geography, Planning and Development
  • Building and Construction

Cite this

Physical parameterization and sensitivity of urban hydrological models : Application to green roof systems. / Yang, Jiachuan; Wang, Zhihua.

In: Building and Environment, Vol. 75, 2014, p. 250-263.

Research output: Contribution to journalArticle

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