Movement Characteristics of Typhoon Rainstorm-Triggered Debris Flow in Qinglong Gully Based on Massflow Model
Typhoon Lekima made landfall on August 10,2019,causing a massive typhoon rainstorm-triggered debris flow in Qinglong Gully located in the middle and low mountainous area of southern Anhui.To deeply explore the movement characteristics of the typhoon rainstorm-triggered debris flow,this study identif...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Pearl River
2023-01-01
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| Series: | Renmin Zhujiang |
| Subjects: | |
| Online Access: | http://www.renminzhujiang.cn/thesisDetails?columnId=47642604&Fpath=home&index=0 |
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| Summary: | Typhoon Lekima made landfall on August 10,2019,causing a massive typhoon rainstorm-triggered debris flow in Qinglong Gully located in the middle and low mountainous area of southern Anhui.To deeply explore the movement characteristics of the typhoon rainstorm-triggered debris flow,this study identifies the characteristics,formation conditions,and source distribution of Qinglong Gully.On this basis,it builds a high-precision three-dimensional model of the study area to calculate two working conditions of the non-typhoon rainstorm and typhoon rainstorm.In addition,Massflow,the software for surface-process dynamic numerical analysis,is employed for numerical simulation and comparative analysis of debris-flow movement characteristics.The results show that the typhoon rainstorm-triggered debris flow has a faster forward speed compared with the non-typhoon rainstorm-triggered debris flow.It moves to the monitoring points j1—j5 at 600 s,100 s,1500 s,1 600 s,and 1 900 s,respectively,and the front can cause damage to the channels and buildings along the way in a short time.Three main accumulation areas are formed in the outbreak of the debris flow.The maximum accumulation thickness of the typhoon rainstorm-triggered debris flow is 3.08 m,3.80 m,and 7.75 m,and the accumulation area is 36 324.4 m<sup>2</sup>,3 700.4 m<sup>2</sup>,and 32 279.5 m<sup>2</sup>,respectively.The debris flow has the characteristics of a large height and plane range of influence,which is more likely to cause serious life and property damage to engineering buildings and residents. |
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| ISSN: | 1001-9235 |