Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/nhess-2016-332
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
04 Jan 2017
Review status
This discussion paper is under review for the journal Natural Hazards and Earth System Sciences (NHESS).
Tangjiaxi Landslide and Impulse Wave Analysis in Zhexi Reservoir of China by Granular Flow Coupling Model
Bolin Huang1, Yueping Yin2, Shichang Wang1, Guangning Liu1, and Jianmin Tan1 1Wuhan Centre of China Geological Survey, Wuhan, China, 430205
2China Institute for Geo-Environment Monitoring, Beijing, China, 100081
Abstract. Rocky granular flow usually forms after rocky bank slopes are failed and rushes into rivers at a high velocity, causing impulse wave disasters. Currently, the granular mass/water coupling study is an important trend in the field of landslide-induced impulse wave. In the paper, a full coupling numerical model for landslide-induced impulse wave is built based on non-coherent granular flow equation. In this model, Mih equation for continuous non-coherent granular flow controls the movement of sliding mass, two-phase flow equation regulates the interaction between sliding mass and water, Re-Normalisation Group (RNG) turbulence model governs the movement of water body. Taking Tangjiaxi landslide as an example, which is located at Zhexi Reservoir in Hunan Province, China, the motion characteristics of Tangjiaxi landslide and the following impulse wave process were analyzed by the coupling model, and the validity of this model was checked. On July 16, 2014, rocky blocks debris flow was formed after the failure of Tangjiaxi landslide, damming Tangjiaxi stream and thus causing an impulse wave disaster with which left three persons dead and nine persons missing. The full coupling numerical analysis showed that after the failure of Tangjiaxi rockslide, rocky granular flows impacted the water at the maximum velocity of about 22.5 m/s, with waves propagating at the maximum celerity of up to 12 m/s. The deposited topographic modeled is similar to that accumulated in the actual situation. The maximum run-up calculated is 21.8 m, close to the value of 22.7 m obtained in the field survey. A series of run-up values in the field survey matches well with the calculated values. Therefore, the full coupling numerical model built in this study can be used to simulate impulse waves generated by rocky granular flows.

Citation: Huang, B., Yin, Y., Wang, S., Liu, G., and Tan, J.: Tangjiaxi Landslide and Impulse Wave Analysis in Zhexi Reservoir of China by Granular Flow Coupling Model, Nat. Hazards Earth Syst. Sci. Discuss., doi:10.5194/nhess-2016-332, in review, 2017.
Bolin Huang et al.
Bolin Huang et al.
Bolin Huang et al.

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