PROGRESS IN GEOGRAPHY ›› 2015, Vol. 34 ›› Issue (9): 1156-1166.doi: 10.18306/dlkxjz.2015.09.008

• Orginal Article • Previous Articles     Next Articles

Spatiotemporal patterns of droughts based on SWAT model for the Weihe River Basin

Anzhou ZHAO1,2,3(), Xianfeng LIU1,2, Xiufang ZHU1,2*, Yaozhong PAN1,2, Yizhan LI1,2   

  1. 1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
    2. College of Resources Science & Technology, Beijing Normal University, Beijing 100875, China
    3. College of Resources, Hebei University of Engineering, Handan 056038, Hebei, China
  • Online:2015-09-25 Published:2015-09-25


Drought is a complex natural hazard that is difficult to define and assess. By considering the hydrological cycle of river basins, a drought evaluation model SWAT-PDSI was constructed based on the Palmer Drought Severity Index(PDSI) and simulated results of SWAT (Soil and Water Assessment Tool) in the Weihe River Basin. Moreover, characteristics of the spatiotemporal distribution and frequency of drought hazard in the basin were analyzed. Results showed that: (1) The calibrated and validated SWAT model can be used to predict the hydrological process in the Weihe River Basin since it results in similar simulated trend of change as the observed data; (2) The SWAT-PDSI model based on SWAT and PDSI well describes the characteristics of drought in the Weihe River Basin as verified by the drought indices in 1995; (3) Temporally, the Weihe River Basin, Weihe River mainstream, and Jinghe River Basin showed a drying trend and the Beiluohe River Basin showed a wetter trend, but these were not statistically significant at the 0.05 confidence level; (4) Spatially, the annual average of SWAT-PDSI was between -1 and 1 in most subbasins; (5) High frequency drought areas were mainly distributed in the upstream of the Beiluohe River Basin and the Jinghe River Basin.

Key words: SWAT model, PDSI, drought assessment, the Weihe River Basin