Spatial and Temporal Characteristics of Meteorological Disasters in Ningxia during Qing Dynasty
In this paper,through the collection and quantitative processing of disaster historical data in Ningxia region,using mathematical statistics and wavelet analysis methods,with the help of Matlab,ArcGIS and SPSS software tools,the frequency characteristics,spatio-temporal distribution and correlation of five major meteorological disasters,including drought,flood,frost and snow,hail and wind and sand,were investigated and studied in Ningxia in the Qing Dynasty(1644-1911 AD).The results show that the frequency of major meteorological disasters in Ningxia region during Qing Dynasty was flood,hail,drought,frost and snow,wind and sand respectively;the temporal distribution of the occurrence of various types of meteorological disasters as a whole showed an upward trend of fluctuation with a low-high-low-high frequency distribution pattern.Morlet wavelet analysis showed that there was a strong and significant 59a long change cycle of meteorological disasters in Ningxia during Qing Dynasty;in the spatial distribution,drought and hail disasters showed a distribution trend of less in the south and less in the north,and flood disasters are mostly distributed in the yellow-introducing area of the northern plains,while the distribution characteristics of frost,snow and sand disasters were less obvious;there was a highly significant positive correlation between floods and hailstorms in the meteorological disaster system,in addition,frost,snow,hail and drought disasters also showed a certain positive correlation between the three types of disasters,namely frost,snow and sand,which is very important for the development of meteorological disaster systems.
Ningxia regionmeteorological disastersspatial and temporal variabilitycorrelation analysisQing dynasty
NETL
NSTL
万方数据
