[1]WU Xiaopiao,ZHOU Zhongfa,ZHU Meng,et al.Spatiotemporal Characteristics of Drought in Different Geomorphic Types in Typical Karst Cluster Areas[J].Research of Soil and Water Conservation,2023,30(01):336-347.[doi:10.13869/j.cnki.rswc.2023.01.011]
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Spatiotemporal Characteristics of Drought in Different Geomorphic Types in Typical Karst Cluster Areas
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 01
Page number:
336-347
Column:
Public date:
2023-01-10
- Title:
- Spatiotemporal Characteristics of Drought in Different Geomorphic Types in Typical Karst Cluster Areas
- CLC:
- P426.6
- DOI:
- 10.13869/j.cnki.rswc.2023.01.011
- Abstract:
- In order to explore the spatial and temporal characteristics of drought in different geomorphic types in the typical karst cluster areas in southwest China, Guizhou Province was selected as the study area. Based on the meteorological data of 19 meteorological stations in Guizhou Province from 1951 to 2020, we studied the changes of precipitation and temperature at different time scales in recent 70 years and discussed the coupling characteristics of annual and seasonal spatiotemporal scales of drought in different geomorphic regions through the methods of SPI index, M-K mutation test and so on. The results showed that:(1)the average annual precipitation in Guizhou in recent 70 years showed a slow downward trend, the temperature showed an upward trend;(2)drought conditions differed significantly in different geomorphic subregions; among them, drought under the background of non-karst and peak cluster depression landforms showed a slight upward trend, while drought in other subregions showed a downward trend;(3)the drought indexes of all subregions showed a decreasing trend in summer and autumn, while an increasing trend was found in winter; except for the karst plateaus and karst faulted basins, droughts in other geomorphological regions in spring was intensifying; the biggest drought intensification degree occurred in spring and autumn of karst valley and summer and winter of karst tectonic basin; the least drought intensification degree occurred in summer and autumn of non-karst areas and winter and spring of karst plateau areas;(4)the mean values of SPI12 in karst valley areas and non-karst areas had no obvious mutation points; the SPI12 values of karst valley changed abruptly in 1987; the SPI12 values of karst plateaus and peak cluster depressions jumped significantly around 2002 and 2019, respectively; The SPI12 values of karst faulted basins suddenly changed three times within the confidence range. In conclusion, these research results can provide a certain reference for disaster prevention and mitigation of the same type of drought.
- References:
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Last Update:
2023-01-10