Prediction of the overtopping-induced breach process of the landslide dam

Zhong, Qiming; Chen, Shengshui; Shan, Yibo

doi:10.1016/j.enggeo.2020.105709

Cited by 35 publications

(19 citation statements)

References 25 publications

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“…Once the landslide dam forms, emergency response normally requires rapid prediction of the breach flow discharge and breach size evolution (Chen et al, 2020). A numerical method that rapidly predicts the dam breach process is proposed based on the model of Zhong et al (2020a).…”

Section: Methodsmentioning

confidence: 99%

“…Where k sm is the correction coefficient of tail water (Fread, 1984), m is the ratio of breach slope (horizontal/vertical); c 1 and c 2 are the correction coefficients. Here, c 1 = 1.7 m 0.5 /s, c 2 = 1.1 m 0.5 /s (Zhong et al, 2020a). b is the breach bottom width, z b is the breach bottom elevation and H = z s -z b is the breach water depth.…”

Section: Methodsmentioning

confidence: 99%

“…Section "Numerical Method" introduces the numerical method that rapidly predicts the dam breach process. According to the grain size distribution of each layer and the breach mechanism, improvements are made based on the numerical model of Zhong et al (2020a). The breach processes of three representative landslide dams are simulated to verify the proposed method in section "Case Studies".…”

Section: Structure Of This Articlementioning

confidence: 99%

“…Most landslide dams have large length-width aspect ratios, so the analysis should focus on the change in dam geometry along the river during dam breaching as well as breach development at the dam crest and downstream slope. Many studies have examined the breach mechanism and process of overtopping-induced landslide dams (Zhong et al, 2020a). Through small-scale physical model tests (Zhang et al, 2010;Niu et al, 2012;Zhou et al, 2019), it was determined that landslide dam erosion primarily manifests as surface erosion during dam collapse.…”

Section: Landslide Dam Breach Mechanisms and Processesmentioning

confidence: 99%

“…Sensitivity analysis showed that, if the breach developed to the dam foundation, the peak discharge would have been approximately 5 times greater than the measured value . Consequently, due to the wide gradation of landslide dam deposits and variations in soil erodibility with dam depth (Chang and Zhang, 2010;Chang et al, 2011), traditional dam breach models should not be applied any longer (Zhong et al, 2020a).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Grain Size Distribution on Landslide Dam Breaching—Insights From Recent Cases in China

et al. 2021

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Landslide dams are common geological features in mountainous areas, which may have serious consequences due to sudden breaching of the dam. An effective emergency response requires rapid and accurate forecasts regarding the landslide dam breach process. However, most existing models use physical, mechanical, and erosion properties of the mean or characteristic grain sizes to represent the landslide deposits. The grain size distribution and variations in soil erodibility with the depth in the landslide dam are not considered, resulting in an incorrect estimation of the breach flow hydrograph. In this paper, a simplified landslide dam classification is presented based on the formation mechanism and grain size distribution of landslide dams. Additionally, the influences of grain size distribution on the residual dam height and breach process of landslide dams are analyzed. This paper proposes a numerical method to rapidly obtain the breach hydrographs and breach morphology evolution of landslide dams. The new method can quickly classify landslide dams according to geological survey data and predict the landslide dam breach process. Three types of representative landslide dams in China are simulated to validate the proposed method. The breach flow discharge is significantly affected by spillway excavation. This contribution can provide rapid prediction of the landslide dam breach process and can be used for the emergency response planning before dam breaching.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Structure Of This Articlementioning

confidence: 99%