Effects of urbanization and functional relief on evaporation in Beijing

LIU Jiahong; LIU Chuang; ZHOU Jinjun; SHAO Weiwei

doi:10.16511/j.cnki.qhdxxb.2021.26.035

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Journal of Tsinghua University(Science and Technology) ›› 2022, Vol. 62 ›› Issue (12) : 1964-1971. DOI: 10.16511/j.cnki.qhdxxb.2021.26.035

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Effects of urbanization and functional relief on evaporation in Beijing

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Abstract

Rapid urbanization has changed the structure of urban land use which has led to changes in evaporation rates in urban areas. Evaporation mechanisms include the common evaporation from the underlying urban surface as well as evaporation inside buildings. Urban surfaces can be divided into road, green spaces, water surfaces and buildings. This paper analyzes evaporation rates for the urbanization levels in six Beijing districts during 2000, 2015 and 2018. Both natural evaporation and the water dissipation inside buildings are considered to analyze the impact of urbanization and non-capital functions relief on the urban regional evaporation. The results show that urbanization significantly enhances the evaporation from urban construction land and the population density is the key factor affecting the evaporation. The deconstruction of the non-capital function reduces the urban social water use and the urban regional evaporation. This analysis of the contributions from the various underlying surfaces to the regional evaporation shows that buildings and green spaces provide most of the evaporation.

Key words

urbanization / evaporation / urban water dissipation / land use type / Beijing districts

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LIU Jiahong, LIU Chuang, ZHOU Jinjun, SHAO Weiwei. Effects of urbanization and functional relief on evaporation in Beijing[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(12): 1964-1971 https://doi.org/10.16511/j.cnki.qhdxxb.2021.26.035

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