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JOURNAL OF HYDROELECTRIC ENGINEERING ›› 2017, Vol. 36 ›› Issue (12): 28-38.doi: 10.11660/slfdxb.20171204

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Characteristics of meteorological drought in Jing-Jin-Ji area and cause analysis

  

  • Online:2017-12-25 Published:2017-12-25

Abstract: Jing-Jin-Ji or Beijing-Tianjin-Hebei area, located in the north of North China Plain, is one of the most arid regions in the North China Plain. In this study, annual and seasonal values of standardized precipitation evapotranspiration index (SPEI) are calculated using meteorological data at 16 gauge stations over this area to analyze the coverage rate and occurrence frequency of drought. We demonstrate the spatial and temporal evolution of drought and its relationship with El Nino-Southern Oscillation (ENSO) in the area in recent 34 years. The results show that in this period, the SPEI values of this area was decreased gradually at a speed of -0.065/10a, and that except for winter season, its drought coverage rates in different time scales showed different increasing rates. And decadal variability in the spatial distribution over Jing-Jin-Ji area was prominent. In the 1980s, its drought coverage rate and occurrence frequency of drought grew in its northwest part; in the 1990s, the growth concentrated on its middle and northeast parts; but in the 2000s, the whole area showed tremendous variations. These drought events are closely related with the ENSO.

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