JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (9): 1591-1601.doi: 10.11849/zrzyxb.20160868

• Resource Evaluation • Previous Articles     Next Articles

Effects of Urbanization on Precipitation Characteristics

CHEN Xiu-hong1, LIU Bing-jun1, CHEN Gang2   

  1. 1. a. Department of Water Resources and Environment, b. Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen University, Guangzhou 510275, China;
    2. Guangzhou Branch of Hydrology Bureau of Guangdong Province, Guangzhou 510150, China
  • Received:2016-08-11 Revised:2017-02-22 Online:2017-09-20 Published:2017-09-20
  • Supported by:
    National Program on Key Research and Development Project of China, No.2016YFC0401305; National Natural Science Foundation of China, No.91547108 and 91547202; Water Conservancy Science and Technology Innovation Project of Guangdong Province, No.2014-20

Abstract: With the process of urbanization, the changes of surface types and atmospheric layer have affected precipitation in urban areas. Based on the remote sensing data of the year 1980, 1990, 2000 and 2010, the urbanization process of Guangzhou was analyzed. The possible effects of urbanization on precipitation were further investigated using the hourly precipitation data in flood seasons of 1984-2015. Results show that: 1) The urban land has expanded at the rate of 20.3 km2/a since 2000, which suggests Guangzhou is in the period of rapid urbanization. 2) Compare with that in slow urban expanding period, the diurnal variation of short term precipitation in rapidly urban expanding period changed greatly, that the frequency of short-term rainfall events with 1-3 h duration in the afternoon increased by 4.1% and the frequency of rainfall events with 4-6 h duration in night increase by 5.2%. 3) In rapidly urban expanding period, the precipitation intensity in the city strengthened that the average precipitation intensities of rainfall events with 1-3 h and 4-6 h duration improved 7.4% and 10.9% respectively and the percentages of extreme hourly precipitation improved 2.4% and 4.4% respectively. 4) The rainfall pattern of precipitation events with 4-6 h duration evidently changed in rapidly expanding period that the annual mean frequencies of rainfalls with unimodal peak and rainfalls with early or middle peaks increase by 29.1% and 41.9%, respectively.

Key words: diurnal variation, precipitation with different durations, rainfall pattern, urbanization

CLC Number: 

  • P461+.8