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Urban floods have large impacts particularly in terms of economic and social losses. Flood risk is commonly thought of as being a combination of the probability and the consequences of flooding. To analyse flooding requires a basic understanding of the hydrology of cities. The paper provides an overview of the consequences of urbanisation on the hy...
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... fairly constant over time. The hydrological cycle is driven by the solar energy and gravitation that cause continuous interrelated processes such as evaporation solar energy and gravitation that cause continuous interrelated processes such as evaporation and transpiration, condensation, precipitation, infi ltration and run off (see also on Fig. 4.). and transpiration, condensation, precipitation, infi ltration and run off (see also on Fig. 4.). In contrast to the global hydrological cycle, in urban areas there is in practice almost never a In contrast to the global hydrological cycle, in urban areas there is in practice almost never a closed hydrological cycle. Many cities ...
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... that cause continuous interrelated processes such as evaporation solar energy and gravitation that cause continuous interrelated processes such as evaporation and transpiration, condensation, precipitation, infi ltration and run off (see also on Fig. 4.). and transpiration, condensation, precipitation, infi ltration and run off (see also on Fig. 4.). In contrast to the global hydrological cycle, in urban areas there is in practice almost never a In contrast to the global hydrological cycle, in urban areas there is in practice almost never a closed hydrological cycle. Many cities depend on water resources from surrounding rural areas closed hydrological cycle. Many cities depend on ...
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Flood assessment in urban catchments is usually addressed through the combination of Geographic Information Systems (GIS) and stormwater models. However, the coupled use of these tools involves a level of detail in terms of hydrological modelling which can be beyond the scope of overall flood management planning strategies. This research consists o...
Citations
... With the development of global urbanization, the variation of urban hydrological processes has become increasingly prominent, and the mechanism of urban water cycle has undergone profound changes, resulting in increasing water risks and water environmental problems, such as frequently happened storm, shortage of water resources and deterioration of water quality (Mrekva et al., 2012;Wang et al., 2014;Sang and Yang, 2017). These disasters have caused huge economic losses and threaten the safety of infrastructure and human lives (Yang et al., 2021). ...
While urbanization’s strong effect on local precipitation has been widely documented, knowledge of how urbanization affects isotopic composition in precipitation is still lacking. In the present study, deuterium-excess (d-excess) served to quantify the contribution of recycled vapor to precipitation in Chengdu city (China) and a nearby rural area. Precipitation from the urban and rural areas showed no significant difference in δ¹⁸O values (p > 0.05). The rural area had significantly higher d-excess (24.29 ± 7.39‰) than the urban (12.71 ± 4.88‰) through the seasons due to higher evapotranspiration flux in the rural area. In summer, however, urban precipitation amount was higher than that of the rural area. Based on d-excess model, the average ratio of recycled vapor was 8.2% in Chengdu, which was lower than in the rural area (36.1%). This highlights the effect of urbanization in decreasing the proportion of vapor from local evapotranspiration contributing to precipitation but blocked much advected moisture. This also implied that precipitation taken in cities were used to represent upwind advected vapor or used as referenced isotopic records for paleoclimate reconstruction based on tree rings or stalagmites sampled in rural area may be erroneous as the effect of urbanization on precipitation vapor. Further studies are needed to explore the effect of urbanization on vapor source of precipitation under different climatic zones.
