Evaluation of barrier lake breach floods: Insights from recent case studies in China

Chen, Zuyu; Zhang, Qiang; Chen, Shujing; Lin, Wei; Zhou, Xingbo

doi:10.1002/wat2.1408

Cited by 16 publications

(3 citation statements)

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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%

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%

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

et al. 2021

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“…Many efforts have been made on the two slides since their occurrences. Except for a news report by Liang et al (2019), the other papers focused respectively on topics as dam-breaching flood prediction or modeling (Zhang et al 2019a;Chen et al 2020;Fan et al 2020), slope Fig. 1 Geographical location of the Baige landslides deformation history through remote sensing techniques (Fan et al 2019;Ouyang et al 2019;Yang et al 2019;Li et al 2020aLi et al , 2020bLiu et al 2020), the monitoring techniques and data during emergency response, and the mechanism and dynamics of the two slides (Zhang et al 2019b;Li et al 2019;Wang et al 2019a;Wu et al 2019;Tian et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Kinematic process and mechanism of the two slope failures at Baige Village in the upper reaches of the Jinsha River, China

Chen

Gao

Zhao

et al. 2021

Bull Eng Geol Environ

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The two landslides are located in the upper reaches of the Jinsha River and both dammed the river. Immediately since the slides, the authors have been working on the slides and help disaster reduction. Based on the data collected by April 2020, this paper is aimed at clarifying the geological condition of the slides and at explaining why the slides occurred and what the whole sliding process was. Conclusions are summarized as follows. First, the two landslides occurred in the suture belt of the Jinsha River and the rocks are composed of tectonic mélange slices of mainly gneiss intermingled with carboniferous slate and marble and with intruded serpentine and granite porphyry. The gneiss generally bears a schistosity plane with an averaged attitude of N47°W/47°, dipping into the slope. Secondly, long-term geomorphological evolution of the bank slope due to river incision contributed to the progressive slope deformation for the development of the "10.10" rockslide. No preferential joints exist in the slope, but alteration and weathering played important roles in its occurrences. Rainfall and earthquakes may also accelerate its deformation. Thirdly, the "10.10" rockslide is of high-speed wedge-like slope failure with a high-position and a high-shear outlet. Its sliding and deposition process demonstrate special features as initial speed, collision between debris, surging waterjet, and second slipping. Fourthly, the whole process of the "10.10" rockslide can be divided into 6 steps, i.e., startup of the major sliding and sliding resistance zones, sliding initiation of the trailing zone, formation of debris-eroded zones, collision of debris and triggering waterjet and mist, secondary slip of the landslide dam, and surface flush in the deposition area. The estimated speed may reach as high as 67 m/s. Fifthly, the "11.3" rockslide follows a different mode, i.e., wedge cleaving effect. And finally, the cracked zones still have the risk to constitute a potential landslide and to dam the river again.

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“…网络版彩图)溃决洪水分析"南科院模型"(图中相关符号意义参见文献[10~14]) Color online) Dam breach analytical approaches for DB-NHRI (the significance of parameters in the figure see refs [10][11][12][13][14]…”

mentioning

confidence: 99%

Back analysis of the breach flood of the “11.03” Baige barrier lake at the Upper Jinsha River

Lin¹,

Chen²,

Zhang³

et al. 2020

Sci. Sin.-Tech.

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Evaluation of barrier lake breach floods: Insights from recent case studies in China

Cited by 16 publications

References 50 publications

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

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

Kinematic process and mechanism of the two slope failures at Baige Village in the upper reaches of the Jinsha River, China

Back analysis of the breach flood of the “11.03” Baige barrier lake at the Upper Jinsha River

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Evaluation of barrier lake breach floods: Insights from recent case studies in China

Cited by 16 publications

References 50 publications

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

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

Kinematic process and mechanism of the two slope failures at Baige Village in the upper reaches of the Jinsha River, China

Back analysis of the breach flood of the &ldquo;11.03&rdquo; Baige barrier lake at the Upper Jinsha River

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Back analysis of the breach flood of the “11.03” Baige barrier lake at the Upper Jinsha River