Numerical Modeling of Overtopping-Induced Breach of Landslide Dams

Shen, Guangze; Su, Jinbao; Xiang, Yan; Zhong, Qiming; Yang, Dongwen

doi:10.1061/(asce)nh.1527-6996.0000362

Cited by 18 publications

(4 citation statements)

References 24 publications

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“…This issue is strongly intertwined with the assumption of uniform flow on the downstream face of the dam (Equation ). Although widespread (e.g., Cai et al., 2022; Macchione, 2008; Shen et al., 2020), this assumption remains an intrinsic limitation of simplified models, while a spatially distributed (e.g., in 2D) approach would be needed to properly capture the complex flow processes involved in dam breach hydraulics.…”

Section: Resultsmentioning

confidence: 99%

Global Sensitivity Analysis of a Dam Breaching Model: To Which Extent Is Parameter Sensitivity Case‐Dependent?

Schmitz

Arnst

Abderrezzak

et al. 2023

Water Resources Research

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With the surge of extreme meteorological events and intensification of urbanization downstream of hydraulic structures, the need for predicting failure of dams and dikes has become of paramount importance for establishing emergency response procedures (Zhong et al., 2021). To this end, numerical models are instrumental tools for simulating the embankment breaching process. Existing models can be classified into three categories. First, statistical (or parametric) models are based solely on regression analysis of data from past events or laboratory campaigns. They describe some breaching parameters (e.g., final breach width, failure duration or maximum breach discharge) as a function of dam or reservoir properties. These simple, computational-efficient models may lack generality because they entirely rely on data from specific cases without considering underlying physics (Chen et al., 2019;De Lorenzo & Macchione, 2014;Lee, 2019). Conversely, distributed physically based models can describe the phenomenon in greater detail, as they solve the flow and sediment governing equations using a computational mesh of the domain. Their results may be accurate but only if reliable data is available and if physical processes are numerically well represented, for example, erosion of non-homogeneous dam material, slope failure or 3D-flow patterns (Cantero-Chinchilla et al., 2019;Onda et al., 2019;Pheulpin et al., 2020;Shimizu et al., 2020). Additionally, the time required to run distributed physically based models can be substantial (ASCE, 2011). Simplified physics-based models offer a good trade-off (Wu, 2013). Without spatially distributing the flow description nor the embankment morphology, they enable simulating hydraulic and dam breach variables (e.g., time-evolution of breach discharge and dimensions) by describing selected physical processes (

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Section: Resultsmentioning

confidence: 99%

Global Sensitivity Analysis of a Dam Breaching Model: To Which Extent Is Parameter Sensitivity Case‐Dependent?

Schmitz

Arnst

Abderrezzak

et al. 2023

Water Resources Research

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show abstract

“…In this section, three typical simplified physically based modes for landslide dam breaching, such as DABA (DAm Breach Analysis) (Chang and Zhang, 2010;Peng et al, 2014;Shi et al, 2015b;Zhang et al, 2019;Chen C. et al, 2020), DB-IWHR (Dam Breach-China Institute of Water Resources and Hydropower Research) (Chen Z. Y. et al, 2015;Wang G. H. et al, 2016;Chen Z. Y. et al, 2020), and DB-NHRI (Dam Breach-Nanjing Hydraulic Research Institute) (Zhong et al, 2018;Zhong et al, 2020a;Zhong et al, 2020b;Shen et al, 2020b;, are introduced in Table 6. Although the simplified physically based landslide dam breach models have shortcomings, they are computationally efficient and have considered the necessary breach mechanisms.…”

Section: Simplified Physically Based Modelsmentioning

confidence: 99%

Review on risk assessments of dammed lakes

Zhong

Wang²,

Shan³

et al. 2023

Front. Earth Sci.

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As one type of natural disaster, dammed lakes pose a serious threat to the safety of lives and properties downstream. Scientific risk assessments of dammed lakes are key for pre-disaster prevention and post-disaster rescue. However, due to the lack of basic information and uncertainty surrounding materials and loads, risk assessments of dammed lakes are more complex than those of artificial reservoir dams, and comprehensive assessment methods are lacking. Based on the evolution of dammed lake hazard chains, starting with the concept of a dammed lake risk assessment, this paper focused on six aspects: worldwide dammed lake databases, hazard assessments for landslide dams, breach mechanisms and breach processes, flood routing after landslide dam breaching, loss assessments, and risk mitigation measures. A comprehensive review was conducted on the qualitative and quantitative risk assessment methods around the world, as well as future outlooks.

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“…The empirical models are easy to use, allowing for rapid prediction of the consequences due to landslide dam failure. In contrast, physically based numerical models have the advantage of reflecting the dam breach mechanisms and failure processes, and can provide the breach morphology evolution processes and the breach flow hydrographs (Zhong et al, 2018;Shen et al, 2020b;Mei et al, 2022). The physically based numerical models can be further divided into simplified and detailed physically based models.…”

Section: Introductionmentioning

confidence: 99%

Centrifugal model tests and numerical modeling on overtopping-induced breach processes of landslide dams

Zhang

Zhong²,

Yang³

et al. 2023

Front. Earth Sci.

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This study used the 400 g-ton geotechnical centrifuge model test system at the Nanjing Hydraulic Research Institute (NHRI) to investigate the breach evolution characteristics and hydrograph process of overtopping-induced breaching of landslide dams. It was achieved by taking advantage of the “time-space amplification” effect created by high-speed rotation using a centrifuge overweight force field. The effects of dam height, slope ratio, and soil gradation on the overtopping failure process of landslide dams were investigated by centrifugal model tests for the first time. In addition, a detailed physically-based dam breach model was developed to simulate the overtopping failure of landslide dams. Results show that the breach process of a landslide dam can be divided into four stages based on the measured breach morphology evolution process and the abrupt variations of breach flow discharge: initial scour on the downstream slope, retrogressive erosion to the dammed lake, erosion along the breach channel, and breach stabilization. Moreover, the peak breach flow is most sensitive to the dam height, followed by the average particle size; the time to peak is mainly affected by the slope ratio, and the relative residual dam height is primarily susceptible to the average particle size. In practice, the calculated results are consistent with the measured results. This study provides a scientific reference for the cognition of the overtopping-induced breach mechanism of landslide dams.

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Numerical Modeling of Overtopping-Induced Breach of Landslide Dams

Cited by 18 publications

References 24 publications

Global Sensitivity Analysis of a Dam Breaching Model: To Which Extent Is Parameter Sensitivity Case‐Dependent?

Global Sensitivity Analysis of a Dam Breaching Model: To Which Extent Is Parameter Sensitivity Case‐Dependent?

Review on risk assessments of dammed lakes

Centrifugal model tests and numerical modeling on overtopping-induced breach processes of landslide dams

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