Cascading breaching of the Tangjiashan landslide dam and two smaller downstream landslide dams

Shi, Zhenming; Guan, Sheng Gong; Peng, Ming; Zhang, Li Min; Zhu, Yan; Cai, Qipeng

doi:10.1016/j.enggeo.2015.05.021

Cited by 59 publications

(54 citation statements)

References 21 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where Q is the discharge flow rate; C 1 is discharge coefficient ranging from 1.3-1.7 m 0.5 /s [25]; C 2 is correction coefficient; B is breach bottom width; H is water level in front of the dam; h is water depth in the breach; z is breach bottom height; The coefficient C 1 and C 2 are determined according to experience in general [6,[15][16][17]. However, to improve the accuracy of the simulation, through tuning the value of C 1 and C 2 and matching the simulative relationship curve between the discharge per unit width (Q/B) and the head (H−z) to the measured data based on Equation 1, the coefficients C 1 and C 2 can be calibrated for this numerical model [23].…”

Section: Dam-break Outflowmentioning

confidence: 99%

“…The key to the calculation of vertical erosion is to establish the relationship between erosion rate and shear stress. Shear stress along solid boundaries triggered by water flow can be solved according to the equations of open channel flow as in Equation (6).…”

Section: Vertical Erosion Of the Breachmentioning

confidence: 99%

“…It is obvious that the process of flood routing slowed the arrived time of the upstream dam-break flood for about 3 h. In this way, the discharge capacity of downstream reservoir can be adjusted in advanced according to the flood warnings from upstream reservoir, so that the sequential dam-break could be delayed. However, the process of flood routing would be ignored sometimes due to the short distance between the upstream and downstream reservoir such as the case study in [6], which would definitely accelerate the rising process of the water level in front of the downstream reservoir and cause calculation errors. It is obvious that the process of flood routing slowed the arrived time of the upstream dam-break flood for about 3 h. In this way, the discharge capacity of downstream reservoir can be adjusted in advanced according to the flood warnings from upstream reservoir, so that the sequential dam-break could be delayed.…”

Section: Flood Routing In the Middle Riverwaymentioning

confidence: 99%

“…However, these parameters are very difficult to preset when lacking measured data. Shi et al [6] simulated the cascading dam breaching of the Tangjiashan landslide dam and two smaller virtual dams downstream based on the Dam Breach Analysis model (DABA), and evaluated the influences of geometric factors on the breaching process. However, the process of flood regulation in reservoirs and the flood routing in the riverway were ignored in this study, and it would greatly influence the simulating results.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical Simulation and Risk Assessment of Cascade Reservoir Dam-Break

Yang

et al. 2020

Water

View full text Add to dashboard Cite

Despite the fact that cascade reservoirs are built in a large number of river basins nowadays, there is still an absence of studies on sequential embankment dam-break in cascade reservoirs. Therefore, numerical simulations and risk analyses of cascade reservoir dam-break are of practical engineering significance. In this study, by means of contacting the hydraulic features of upstream and downstream reservoirs with flood routing simulation (FRS) and flood-regulating calculation (FRC), a numerical model for the whole process of cascade reservoir breaching simulation (CRBS) is established based on a single-embankment dam-break model (Dam Breach Analysis—China Institute of Water Resources and Hydropower Research (DB-IWHR)). In a case study of a fundamental cascade reservoir system, in the upstream Tangjiashan barrier lake and the downstream reservoir II, the whole process of cascade reservoir dam-break is simulated and predicted under working schemes of different discharge capacities, and the risk of cascading breaching was also evaluated through CRBS. The results show that, in the dam-break of Tangjiashan barrier lake, the calculated values of the peak outflow rate are about 10% more than the recorded data, which are in an acceptable range. In the simulation of flood routing, the dam-break flood arrived at the downstream reservoir after 3 h. According to the predicted results of flood-regulating calculations and the dam-break simulation in the downstream reservoir, the risk of sequential dam-break can be effectively reduced by setting early warnings to decrease reservoir storage in advance and adding a second discharge tunnel to increase the discharge capacity. Alongside the simulation of flood routing and flood regulation, the whole process of cascade dam-break was completely simulated and the results of CRBS tend to be more reasonable; CRBS shows the great value of engineering application in the risk assessment and flood control of cascade reservoirs as an universal numerical prediction model.

show abstract

Section: Dam-break Outflowmentioning

confidence: 99%

Section: Vertical Erosion Of the Breachmentioning

confidence: 99%

Section: Flood Routing In the Middle Riverwaymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Simulation and Risk Assessment of Cascade Reservoir Dam-Break

Yang

et al. 2020

Water

View full text Add to dashboard Cite

show abstract

“…Many scholars have carried out model experiments on landslide dam failure [15][16][17][18]. In addition to experimental research, physically-based mathematical models have been established for practical uses [19][20][21][22][23]. The application of these models and methods are useful in disaster prevention, mitigation, and risk assessment of floods caused by the failure of landslide dams.…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Study of the Failure Modes and Process of Landslide Dams Due to Upstream Flow

Zhu

Peng

Cheng

et al. 2019

Water

View full text Add to dashboard Cite

In the process of mineral development, large-scale flash floods (or debris flows) can be induced by the failure of landslide dams formed by the disorganized stacking of mine waste. In this study, the modes and processes of mine waste dam failures were explored using 13 experimental tests based on the field investigation of landslide dams in the Xiaoqinling gold mining area in China. Our 13 mine waste dam experiments exhibited three failure modes: (i) Piping, overtopping, and erosion; (ii) overtopping and soil collapse; and (iii) overtopping and erosion. In addition, the failure processes of the landslide dams included impoundment, seepage, overtopping, and soil erosion. Different experimental conditions would inevitably lead to different failure processes and modes, with the failure modes being primarily determined by the seepage characteristics. Overtopping was the triggering condition for dam failure. The landslide dam failure process was determined based on the particle size of the mine waste and the shape of the dam. These findings will provide a scientific reference for the prevention and mitigation of natural hazards in mining areas.

show abstract

Breaching and Flood Routing Simulation of the 2018 Two Baige Landslide Dams in Jinsha River

Peng

Shen

et al. 2020

Dam Breach Modelling and Risk Disposal

View full text Add to dashboard Cite

Cascading breaching of the Tangjiashan landslide dam and two smaller downstream landslide dams

Cited by 59 publications

References 21 publications

Numerical Simulation and Risk Assessment of Cascade Reservoir Dam-Break

Numerical Simulation and Risk Assessment of Cascade Reservoir Dam-Break

A Preliminary Study of the Failure Modes and Process of Landslide Dams Due to Upstream Flow

Breaching and Flood Routing Simulation of the 2018 Two Baige Landslide Dams in Jinsha River

Contact Info

Product

Resources

About