Based on the field observations of fog distribution from 1954-2015 at the upper reaches of the Yangtze River, the Mann-Kendall (M-K) and the Moving TTest (MTT) mutation detection methods have been applied to study the characteristics of annually averaged fog days as well as revealing the mutation patterns and period. The occurrence patterns of extreme weather conditions in the research domain were also explored and discussed. The correlation analysis between the fog characteristics and the precipitation, freight volume, port cargo throughput, hydrological conditions indicate that mutation changes of fog conditions in the Chongqing reach shows a clear pattern with short cycles of 8a,16a and long cycles of 20a, 32a. The temporal mutation changes are consistent with the occurrence of regional climatic extreme such as high temperatures and precipitation. The variation of fog distribution has a correlation with the seasonal precipitation and hydrological conditions, positive in spring and summer, negative in autumn. However, the correlation during the winter is not significant. The kappa consistency test indicates that the freight volume was also affected by the fog condition, cause its significance value(P) and kappa value are 0.024, -0.238. Cargo turnover and port cargo throughput are 0.983, 0.309 in P, 0.003, -0.128 in kappa respectively. It is concluded that both cargo turnover and port cargo are not related to annually fog days significantly.
Characteristics and correlation analysis of fog distribution in the upper Yangtze River waterways
2023-08-04
613967 byte
Conference paper
Electronic Resource
English
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