TY - JOUR
T1 - Physical Determinants and Reduced Models of the Rapid Cooling of Urban Surfaces During Rainfall
AU - Omidvar, Hamidreza
AU - Bou-Zeid, Elie R.
AU - Chiaramonte, Maurizio
N1 - Funding Information:
This work is supported by the Army Research Office under contract W911NF‐15‐1‐0003 (program Manager Julia Barzyk), by the US National Science Foundation through ICER 1664091 and CBET1444758 (The Urban Water Innovation Network Sustainability Research Network), and by the Princeton Environmental Institute through the Mary and Randall Hack'69 Research Fund. The Broadmead atmospheric data were collected and provided to the authors by James A. Smith and Mary Lynn Baeck. The codes for both the full and reduced models are hosted at GitHub and can be accessed online (https://github.com/ hamidrezaomidvar/Runoff_pavement_ heat_transfer).
Funding Information:
This work is supported by the Army Research Office under contract W911NF-15-1-0003 (program Manager Julia Barzyk), by the US National Science Foundation through ICER 1664091 and CBET1444758 (The Urban Water Innovation Network Sustainability Research Network), and by the Princeton Environmental Institute through the Mary and Randall Hack'69 Research Fund. The Broadmead atmospheric data were collected and provided to the authors by James A. Smith and Mary Lynn Baeck. The codes for both the full and reduced models are hosted at GitHub and can be accessed online (https://github.com/hamidrezaomidvar/Runoff_pavement_heat_transfer).
Publisher Copyright:
©2019. The Authors.
PY - 2019/5
Y1 - 2019/5
N2 - Using a detailed model, sensitivity analyses are conducted to identify the leading physical determinants and heat fluxes that control energy exchange between surface runoff and urban pavements during rainfall. These analyses confirm that pavement characteristics, such as albedo and thermal effusivity, strongly influence the initial temperature of the pavement before rain starts. Moreover, this sensitivity propagates to the runoff and pavement temperatures as well as to sensible heat and evaporation fluxes during and after rainfall. Heat transfer inside the runoff and pavement during rainfall is also very sensitive to the rain temperature and is the leading process in surface cooling (the classically important sensible and latent heat fluxes to the atmosphere are minor contributors). Finally, based on the findings from the sensitivity analyses, using a bulk energy approach, a reduced version of the full model is proposed. This simple model uses the spatially averaged temperatures of the runoff and pavement and can predict their temperatures and the associated energy fluxes almost as accurately as the full model. The reduced model has the added advantages of computational efficiency and simplicity of implementation in coarse earth system models.
AB - Using a detailed model, sensitivity analyses are conducted to identify the leading physical determinants and heat fluxes that control energy exchange between surface runoff and urban pavements during rainfall. These analyses confirm that pavement characteristics, such as albedo and thermal effusivity, strongly influence the initial temperature of the pavement before rain starts. Moreover, this sensitivity propagates to the runoff and pavement temperatures as well as to sensible heat and evaporation fluxes during and after rainfall. Heat transfer inside the runoff and pavement during rainfall is also very sensitive to the rain temperature and is the leading process in surface cooling (the classically important sensible and latent heat fluxes to the atmosphere are minor contributors). Finally, based on the findings from the sensitivity analyses, using a bulk energy approach, a reduced version of the full model is proposed. This simple model uses the spatially averaged temperatures of the runoff and pavement and can predict their temperatures and the associated energy fluxes almost as accurately as the full model. The reduced model has the added advantages of computational efficiency and simplicity of implementation in coarse earth system models.
KW - earth surface temperature
KW - rain temperature
KW - runoff-pavement heat transfer
KW - surface cooling
KW - urban pavements
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U2 - 10.1029/2018MS001528
DO - 10.1029/2018MS001528
M3 - Article
AN - SCOPUS:85065739694
SN - 1942-2466
VL - 11
SP - 1364
EP - 1380
JO - Journal of Advances in Modeling Earth Systems
JF - Journal of Advances in Modeling Earth Systems
IS - 5
ER -