Urban Impacts on Extreme Monsoon Rainfall and Flooding in Complex Terrain
Urban Impacts on Extreme Monsoon Rainfall and Flooding in Complex Terrain
复制标题
城市对复杂地形极端季风降雨和洪水的影响
DOI：
10.1029/2019gl083363
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Niyogi, Dev
中科院分区：
文献类型：
--
作者：
Yang, Long;Smith, James;Niyogi, Dev
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.
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