JOURNAL OF NATURAL RESOURCES ›› 2015, Vol. 30 ›› Issue (6): 951-962.doi: 10.11849/zrzyxb.2015.06.006

• Resource Evaluation • Previous Articles     Next Articles

The Characteristics of Drought-Flood Variation and Its Influence Factors in Beijing during 1960-2013

LI Shuang-shuang1,2, YANG Sai-ni1,2, LIU Xian-feng1,3   

  1. 1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;
    2. Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China;
    3. College of Resource Science and Technology, Beijing Normal University, Beijing 100875, China
  • Received:2014-05-18 Revised:2014-10-15 Online:2015-06-20 Published:2015-06-20

Abstract:

Using the daily precipitation data of 34 meteorological stations in Beijing and its surrounding areas, this paper attempts to describe the variation trends of drought-flood in Beijing in different seasons during 1960-2013. Based on Standardized Precipitation Index (SPI), correlation analysis, Morlet wavelet analysis and other climate diagnosis method, we analyzed the influence factors of drought-flood variations. It is found that the number of minor drought-flood events decreased, while that of the severe drought- flood events increased during that period, which indicates that drought and flood events were becoming more extreme. At short- time scales, SPI fluctuated greatly, which means that drought and flood alternated frequently. At long-time scales, droughts and floods alternated frequently before the 1980s; after the middle of 1980s, SPI was going down, so that the number of flood disasters decreased, while the number of drought disasters increased gradually. Since there was little precipitation during 1999- 2008, the continuous drought occurred during the past decade. The urbanization process had obvious effect on the intensity of droughts and floods, but it did not affect the interdecadal variation. The relationship between drought-flood and El Niño-Southern oscillation (ENSO) is unstable. During the El Niño before 1980s, precipitations in summer showed a decreasing trend, leading to a severe drought in Beijing. With the emergence of the anomalous convection over the western North Pacific after the 1980s, the relationship became weak. The western Pacific subtropical high and East Asian summer monsoon showed relatively stable relationship with the variation of droughts and floods in Beijing: when the East Asian summer monsoon was stronger than normal and the western Pacific subtropical high went more northward, continuous droughts occurred in Beijing, whereas the reverse would cause flood.

Key words: SPI, climate change, Beijing, drought-flood variation

CLC Number: 

  • P426.616