Characteristics of Meteorological Drought-Hydrological Drought Propagation Process and Its Influencing Factors-Taking Guizhou Qianzhong Water Conservancy Project Area as An Example
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Characteristics of Meteorological Drought-Hydrological Drought Propagation Process and Its Influencing Factors-Taking Guizhou Qianzhong Water Conservancy Project Area as An Example
ZHANG Lang, HE Zhonghua, YANG Mingke, et al. Characteristics of Meteorological Drought-Hydrological Drought Propagation Process and Its Influencing Factors-Taking Guizhou Qianzhong Water Conservancy Project Area as An Example[J]. 2022, 36(1): 142-152.
DOI:
ZHANG Lang, HE Zhonghua, YANG Mingke, et al. Characteristics of Meteorological Drought-Hydrological Drought Propagation Process and Its Influencing Factors-Taking Guizhou Qianzhong Water Conservancy Project Area as An Example[J]. 2022, 36(1): 142-152. DOI: 10.13870/j.cnki.stbcxb.2022.01.020.
Characteristics of Meteorological Drought-Hydrological Drought Propagation Process and Its Influencing Factors-Taking Guizhou Qianzhong Water Conservancy Project Area as An Example
In order to explore the characteristics of the propagation process of meteorological drought to hydrological drought in karst region
the SPI and SRI standardization indexes were used to identify regional drought
and methods of cross wavelet
wavelet coherence and state transition probability were used to explore the drought propagation characteristics such as propagation intensity and response rate. The results showed that: (1) The duration of meteorological drought and hydrological drought in the 60 s and 70 s of the last century was shorter
while the regional droughts in the 80 s of the last century and the early 21st century lasted longer. There was a significant positive correlation between SPI and SRI
and the process of meteorological drought tended to hydrological drought took 1.5 months. (2) The transmission intensity of drought DPI in the karst area was greater than 1 and the response rate was relatively high. Hydrological drought was extremely sensitive to the occurrence of meteorological drought
especially in areas where the cutting depth of the surface was relatively shallow and the karst development was relatively strong. (3) The propagation process was mainly affected by the cutting depth of the surface. The influence degree of each underlying surface condition to the drought propagation process was sequenced as surface cutting depth> karst development intensity> elevation> topography and landforms
among them the characteristics of drought propagation was significantly negatively correlated with the depth of surface cutting
and positively correlated with the intensity of karst development
elevation
and topography. In the areas with shallow cut
medium cut
or low altitude and strong karst development
the transfer of DPI and Rr between each grade was more active. On the whole
the propagation characteristics showed an increasing trend in 57 years. The results could provide a theoretical basis for drought prevention and monitoring in karst areas
especially for the sustainable development planning of ecologically fragile areas.
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Related Author
YOU Man
PI Guining
ZHANG Lang
HE Zhonghua
YANG Mingke
PI Guining
YANG Mingke
YOU Man
Related Institution
College of Geography and Environmental Sciences, Guizhou Normal University
National Karst Rocky Desertification Prevention Engineering Technology Research Center. Guizhou Normal University
Heihe Water Resources and Ecological Protection Research Center
Yellow River Conservancy Commission, Yellow River Institute of Hydraulic Research
School of Surveying and Land Information Engineering, Henan Polytechnic University