Multi-scale characteristics of flood disasters and its response to precipation in Weinan region from 1600 to 1900
Purposes—To study the multi-scale characteristics of flood disasters in Weinan region from 1600 to 1900 and their response to precipitation,and to provide a theoretical basis for under-standing the occurrence mechanism of flood disasters and the law of climate change in historical peri-ods in this region.Methods—Based on historical documents such as Collection of 3 000 Meteorological Records of China,ensemble empirical mode decomposition(EEMD)and morlet wavelet analysis were used for above-mentioned purposes.Results—From 1600 to 1900,the flood disasters in Weinan region had significant inter-annual changes of quasi-3 a and 6 a,quasi-12 a,15 a,28 a and 57 a,and quasi-125 a and 208 a.El Nino and Pacific decadal oscillations may be the main causes of flooding in the re-gion.The variance contribution rate of flood disasters on the interannual scale(68.34％)was greater than that on the interdecadal and centennial scales(24.0％and 2.92％),which may imply that the in-terannual oscillation signal of flood disasters in this region is stronger than that of the interdecadal and centennial scale.Conclusions—The flood disaster in Weinan region from 1600 to 1900 has significant interannual,interdecadal and centennial oscillation,and had a good response to the precipitation in Huashan mountain and North-Central China.
Weinan regionflood disastersclimate changeinterannual-centennial time scale
万方数据
维普
