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Urban Impacts on Extreme Monsoon Rainfall and Flooding in Complex Terrain
Geophysical research letters, 2019-06, Vol.46 (11), p.5918-5927
[Peer Reviewed Journal]
2019. American Geophysical Union. All Rights Reserved. ;ISSN: 0094-8276 ;EISSN: 1944-8007 ;DOI: 10.1029/2019GL083363
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Title:
Urban Impacts on Extreme Monsoon Rainfall and Flooding in Complex Terrain
Author:
Yang, Long
;
Smith, James
;
Niyogi, Dev
Subjects:
Anomalies
;
Arizona
;
Atmospheric circulation
;
Central business districts
;
complex terrain
;
Computer simulation
;
extreme rainfall
;
Extreme weather
;
flood
;
Flood hydrology
;
Flood peak
;
Flooding
;
Floods
;
Hydrologic models
;
Hydrology
;
Hydrometeorology
;
land‐atmosphere interaction
;
Monsoon floods
;
Monsoon rainfall
;
Monsoons
;
Outflow
;
Rain
;
Rainfall
;
Rainfall anomalies
;
Rainfall simulators
;
Storms
;
Surface roughness
;
Terrain
;
Urban areas
;
urban impact
;
Urbanization
;
Watersheds
Is Part Of:
Geophysical research letters, 2019-06, Vol.46 (11), p.5918-5927
Description:
Hydrometeorological impacts due to urbanization for cities close to complex terrain are poorly understood due to the complexities of terrain‐related circulation and urban perturbations of atmospheric flow. In this study, we examine urban impacts on extreme monsoon rainfall and the resultant flooding over central Arizona based on high‐resolution atmospheric and hydrological model simulations. Strong positive rainfall anomalies at the urban‐rural interface downwind of the city are mainly related to dynamic effects (increased surface roughness) on convective outflow boundaries. Urban‐related thermodynamic disturbances slightly increase rain rates over the downtown core of Phoenix. Contrasting rainfall anomalies for two consecutive storm episodes highlight the importance of flow regime analysis in understanding urban impacts on extreme rainfall in complex terrain. Urban‐induced rainfall anomalies result in amplification of flood peak magnitudes by as much as a factor of 2 for Phoenix watersheds. Our results highlight the urban impacts on regional flood hydrology through land‐atmosphere interactions. Key Points Contrasting rainfall anomalies for two consecutive storm episodes in the Phoenix metropolitan region show a strong dependence on flow regime The dynamic perturbation to terrain‐related circulations dominates urban‐induced rainfall anomalies in complex terrain The impacts of urban‐induced rainfall anomalies on flood response are assessed through hydrological modeling experiments
Publisher:
Washington: Blackwell Publishing Ltd
Language:
English
Identifier:
ISSN: 0094-8276
EISSN: 1944-8007
DOI: 10.1029/2019GL083363
Source:
Wiley Blackwell AGU Digital Library
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