ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 48 Issue 10 > 2022,48(10):1321-1332. DOI:10.7519/j.issn.1000-0526.2022.072202 Prev Next
Cause of the Geological Hazards Induced by Rainstorm in Enshi Autonomous Prefecture
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Abstract:
Geological hazards such as landslides and debris flows are usually caused by severe precipitation directly, so analyzing the correlation between geological hazards and severe precipitation is of great significance. In this paper, four continuous severe rainfall processes in July 2020 responsible for geological disaster events in Enshi Autonomous Prefecture, southwestern Hubei Province are analyzed, the relationships between rainfall intensity and duration are investigated, and the geological disasters and the disaster-caused background in recent years are compared. Based on the potential dangerous 〖JP2〗degree and regional vulnerability 〖JP〗degree of geological disasters and combined with multi-source quantitative precipitation estimation (QPE) with 5 km spatial resolution and 24 h temporal resolution, the land-surface hydrological model is driven to simulate the runoff and soil moisture characteristics during the disaster process. The causes of cluster-occurring geological disasters induced by the fourth rainfall process from 15 to 19 July are emphatically analyzed. The results reveal that most areas of Enshi Autonomous Prefecture are of high potential dangerous degree but have low degree of vulnerability. The rainfall processes with accumulated precipitation over 100 mm, daily accumulated rainfall over 50 mm, or hourly rainfall with 10-30 mm can possibly trigger geological disasters in this region. The land-surface hydrological simulation can better represent the occurrence and development of disasters, while the I-D curve established in this paper can be used as an indicator for early warning in the concerned area.
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