Hou Yule, Liu Rui, ZhaoJingbo. Characteristics of Flood Disasters in Dry-Hot Valley of Dadu River in Hanyuan County, Sichuan Province in Qing Dynasty[J]. Bulletin of Soiland Water Conservation, 2019, 39(1): 271-277.
DOI:
Hou Yule, Liu Rui, ZhaoJingbo. Characteristics of Flood Disasters in Dry-Hot Valley of Dadu River in Hanyuan County, Sichuan Province in Qing Dynasty[J]. Bulletin of Soiland Water Conservation, 2019, 39(1): 271-277. DOI: 10.13961/j.cnki.stbctb.2019.01.043.
Characteristics of Flood Disasters in Dry-Hot Valley of Dadu River in Hanyuan County, Sichuan Province in Qing Dynasty
[Objective] To analyze the characteristics and causes of flood disasters in Hanyuan County
Sichuan Province in Qing Dynasty
in order to provide scientific support for disaster preventions and mitigations. [Methods] The flood disaster data of Hanyuan County in Qing Dynasty was collected. Mathematical statistics analysis methods were used to study the level
frequency
period and causes of the flood disasters in Qing Dynasty. [Results] There were 55 flood disasters with an average frequency of once per 4.87 years in Hanyuan County in the Qing Dynasty. Mild floods
moderate floods
major floods and catastrophic floods accounted for 14.55%
60.00%
21.82% and 3.64% of the total flood disasters
respectively
with moderate floods being the main events. Flood disasters showed a fluctuated increasing trend and obvious stages. The periods during 1644-1739 and 1770-1809 were the stage of frequent flood disasters
the periods during 1740-1769 and 1810-1911 were the stage of high-risk flood disasters
and there were five major flood events. The flood disasters in Hanyuan County in Qing Dynasty were marked by a shock period of about 5 years and 10 years
and the flood frequency was high. [Conclusion] There is a high probability of flood disasters in the extreme years of the sunspot
the prosperity period of India summer monsoon and the year of the ENSO events. The rapid of population growth
agricultural reclamation
forest destruction and human-made disorderly development aggravated the frequency and severity of flood disasters.
Zhao Y, Shi J, Shi S, et al. Tree-ring latewood width based July-August SPEI reconstruction in South China since 1888 and its possible connection with ENSO[J]. Journal of Meteorological Research, 2017,31(1):39-48.