Author(s): Jiahong Liu, Jinjun Zhou, Weiwei Shao, Hao Wang, Zhentao Cong
Linked Author(s): Jiahong Liu
Keywords: Urban hydrology, water consumption, dualistic water cycle, mechanism model, evapotranspiration
Abstract: Water balance analysis showed that the intensity of water consumption in urban units was significantly higher than that in suburban areas. In this study, the city area is divided into different water consuming units based on the prototype observation of water consumption and the characteristics of the underlying surface of the city, and the mechanism of urban water consumption was analyzed. A mathematical model was built to simulate the water consumption processes in cities with complicated underlying surfaces. For example, the water consumption intensity (WCI) of each unit was calculated in Beijing city. Beijing's urban water consumption intensity was 850 mm in 2014, which was verified by water balance analysis based on observation datasets. The breakdown results show that the WCI of residential buildings depend on the residents living and work habits. The WCI of municipal square and road is determined by precipitation characteristics and runoff coefficients of the underlying surface. The WCI of water and green land depends on temperature, solar radiation, precipitation and other meteorological factors like wind speed, humidity, etc. The amount of water consumption for one kind of urban unit is the product of WCI and area of the urban unit. In the study area, the amount water consumption of residential buildings is the largest contributor for the urban water consumption, followed by that of green land. In urban areas, residential buildings, roads and municipal squares greatly enhance the water consumption intensity, and their contributions to total amount water consumption are greater than that of green land and water
Year: 2017