TITLE:
Characteristics Analysis on Short-Time Heavy Rainfall during the Flood Season in Shanxi Province, China
AUTHORS:
Xiaoting Tian, Dongliang Li, Jinhong Zhou, Yaqing Zhou, Zexiu Zhang
KEYWORDS:
Flood Season, Short-Time Heavy Rainfall, Temporal and Spatial Distribution, Shanxi Province
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.7 No.3,
March
29,
2019
ABSTRACT: In order to provide a reference for the correct forecasting of short-term heavy
rainfall and better disaster prevention and mitigation services in Shanxi
Province, China, it is very important to carry out systematic research on
short-term heavy precipitation events in Shanxi Province. Based on hourly
precipitation data during the flood season (May to September) from 109 meteorological
stations in Shanxi, China in 1980-2015, the temporal and spatial
variation characteristics of short-time heavy rainfall during the flood season
are analyzed by using wavelet analysis and Mann-Kendall test. The results
show that the short-time heavy rainfall in the flood season in Shanxi Province
is mainly at the grade of 20 - 30 mm/h, with an average of 97 stations having
short-time heavy rainfall each year, accounting for 89% of the total stations.
The short-time heavy rainfall mainly concentrated in July and August, and
the maximal rain intensity in history appeared at 23 - 24 on June 17, 1991 in
Yongji, Shanxi is 91.7 mm/h. During the flood season, the short-time heavy
rainfalls always occur at 16 - 18 pm, and have slightly different concentrated
time in different months. The main peaks of June, July and August are at 16,
17 and 18 respectively, postponed for one hour. Short-time heavy rainfall
overall has the distribution that the south is more than the north and the east
less than the west in Shanxi area. In the last 36 years, short-time heavy rainfall
has a slight increasing trend in Shanxi, but not significant. There is a clear
4-year period of oscillation and inter-decadal variation. It has a good correlation
between the total precipitation and times of short-time heavy rainfall
during the flood season.