Plateau Meteorology

Plateau Meteorology >

2017 , Vol. 36 >Issue 6: 1521 - 1532

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00099

 

Rainstorm and Flood Disaster Characteristics and Analysis of Circulation Background in Main Flood Season in Sichuan

  • DENG Guowei ,
  • SUN Jun ,
  • RUAN Guibin ,
  • MA Zhenfeng
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  • Nanxi District Meteorological Service, Yibin 644100, Sichuan, China;Sichuan Climate Center, Chengdu 610072, Sichuan, China;Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, Sichuan, China;China meteorological Administration Training Centre Sichuan Branch, Chengdu 610071, Sichuan, China

Received date: 2016-03-11

  Online published: 2017-12-28

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Abstract

Using the investigation data of heavy rainstorm-induced economic damage in Sichuan province area during 1984-2010, the characteristics of rainstorm-induced flood disaster in the last 30 years were studied. The population exposure and vulnerability index have been derived and used to do potential analysis of flood and economy damage. The disaster associated rainstorm was analyzed with the gauge stations observed daily rainfall data from China Meteorological Agency (CMA). Then we analyzed the atmospheric circulation for the heavy rainstorm which has caused flood and economic damage for Sichuan province using National Centers for Environmental Prediction (NCEP) reanalysis data from June to September (the main rainfall and rainstorm seasons) during 1981-2010. The results showed that the population affected due to rainstorm and flood disaster was increased during last 30 years. The increasing rate was more significant after the year of 1999. The population and economy potential damage analysis show that Chengdu city has a high exposure index value, but with a low vulnerability index. The exposure index of Ganzi/Aba area was the lowest in the province. The big city has a high population intensity influenced by the flood disaster, while the undeveloped area has a low population disaster intensity. The indices of population vulnerability and economic vulnerability of Sichuan were shown with an oscillation period of 2 years. The impact of heavy rains and flooding on Mianyang and Bazhong city, which was located in the rainstorm center of Sichuan province would be further exacerbated, and the cities, whose indices of population vulnerability and economic vulnerability were among the forefront of the province were mainly located in East Sichuan Area. In addition, circulation background characteristics of heavy rain in main raining seasons was analyzed to show that:South Asian High was "Western-type" and its intensity was weaker than annual average; Subtropical High was showed with a significantly quasi biweekly oscillation from July; Atmospheric circulation of the middle and upper troposphere in East Asia has a low frequency oscillation of 20~30 days in the mid-high latitude; Plateau vortex was showed with about 22 days of the oscillation cycle and Southwest flow in low latitudes was continuously transported to high latitudes. The flood associated heavy rainstorm maybe closely related these atmospheric circulation patterns.

Key words： Rainstorm disaster; exposure; vulnerability; circulation backgrou; oscillation

Cite this article

DENG Guowei , SUN Jun , RUAN Guibin , MA Zhenfeng . Rainstorm and Flood Disaster Characteristics and Analysis of Circulation Background in Main Flood Season in Sichuan[J]. Plateau Meteorology, 2017 , 36(6) : 1521 -1532 . DOI: 10.7522/j.issn.1000-0534.2016.00099

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