Physical modeling into outflow hydrographs and breach characteristics of homogeneous earthfill dams failure due to overtopping

Kouzehgar, Kamran; Hassanzadeh, Yousef; Eslamian, Saeid; Fard, Mikaeil Yousefzadeh; Amini, Alireza Babaeian

doi:10.1007/s11629-020-6177-1

Cited by 9 publications

(3 citation statements)

References 51 publications

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“…Portions at chainage 3+705 leading to the spillway channel was eroded due to the axial load imposed by the moving vehicles. Kouzehgar et al (2021) indicate that embankment dams are usually earth-filled and that due to large footprint and lower stresses in the dam foundation, the foundation requirements for embankment dams are less stringent than those for concrete dams.…”

Section: Pulima Irrigation Scheme Assessment Head Work: the Dam Wall ...mentioning

confidence: 99%

An evaluation of small-scale irrigation schemes infrastructure

Bowan,

Anzagira,

Issahaku

et al. 2023

JGhIE

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The development and management of irrigation in many developing countries have been characterized by many challenges, which have led to irrigation capacity utilization on some existing schemes being very low. This study assesses small-scale irrigation scheme infrastructure in the Upper West Region of Ghana, using Yeleyiri irrigation scheme in the Wa West District and Pulima irrigation scheme in the Sissala West District as case studies. The focus of the assessment was on the status and an analysis of the rehabilitation requirements of the two schemes. In conducting the evaluation, transect walks, topographic surveys, field observation, field measurement, interviews, focused group discussions, and questionnaire surveys were the approaches and methodology adopted. The results showed that the head works, slopes, inlet and outlet structures, water distribution systems, and drainage in both schemes were in a deplorable state and thus, required maintenance to ensure the optimization of the utilization of both schemes. In addition, the absence of a farmhouse and storage facilities in both schemes made the effective management of the schemes a major challenge. The study, therefore, proposes some interventions for the rehabilitation and efficient optimization of the two small-scale irrigation schemes.

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Section: Pulima Irrigation Scheme Assessment Head Work: the Dam Wall ...mentioning

confidence: 99%

An evaluation of small-scale irrigation schemes infrastructure

Bowan,

Anzagira,

Issahaku

et al. 2023

JGhIE

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“…K and Babaeian Amini, A. (2021) [17] carried out a dam-break physical model test due to overtopping considering a homogeneous earth-fill dam to establish a regression equation for peak outflow hydrograph and breach geometry. Ashraf, M. [18] studied the large-scale physical model to establish the relationship between breach parameters considering the breach opening, outflow peak, and breaching time through statistical methods using a regression model.…”

Section: Of 24mentioning

confidence: 99%

Potential Dam Breach Flood Hazard Assessment of Kulekhani Reservoir Rock Fill Dam Using 2D Diffusion and Full Dynamic Shallow Water Equation Defining Coriolis Effect

Pandey,

Knoblauch,

Zenz

2023

Preprint

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Dam breaches have catastrophic consequences, causing severe property damage, life loss, and environmental impact. The Kulekhani reservoir rockfill dam break was studied to evaluate the downstream impact. The appropriate breaching parameter of MacDonald and Langridge (1984) regression equations was selected based on the sixteen observed dam failure cases and cross-sectional geometry of the existing dam of Kulekhani. The 2D Diffusion Wave and Full Dynamic Wave Equation were applied for downstream flood assessment, Full Dynamic Wave was able to capture the physical flow phenomena like river bend effects resulting in higher flow velocity at the outer bend, and formation of eddies considering losses. The application of a Full Dynamic Equation was found to be appropriate for rapidly varying unsteady flow considering steep slopes, and sudden changes in channel geometry. Flood mapping of water depth, flow velocity, flood intensity, and arrival time were carried out for flood hazard assessment classified by the American Society of Civil Engineers (ASCE). Flow depth and extension of the flow area were compared to identify the affected area, higher flow depth and larger extension were observed using a Full Dynamic Wave Equation as a result of less flow velocity considering the losses. Almost 17 minutes of the arrival time of peak difference at the Bagmati River confluence was evaluated between the models which plays an important role in decision-making for selection of the flood model. Flood mitigation with river diversion works through a hydraulic measure of Levee was suggested to protect the highly affected households of Ranche, Nagmar, Khanikhet, and Debaltar towns. Most of the household was found to be safe after the construction of the Levee except for eleven houses that lie along the river below flood elevation of 1269.6 m.a.s.l. This signifies the importance of room for the rivers and the human settlement near the river might be life-threatening.

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“…The failure modes of dams generally include overtopping, piping, and slope failure (Okeke and Wang, 2016;Rifai et al, 2017;Zhu et al, 2020;Kouzehgar et al, 2021). These modes are affected by many factors such as construction materials, geometry of the dam, upstream flow, and channel bed conditions (Gregoretti et al, 2010;Chen et al, 2015;Jiang et al, 2020a).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Failure Modes and Progressive Failure Process of Earthen Check Dam Triggered by Upstream Flow

Zhu

Yang

et al. 2022

Front. Earth Sci.

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The progressive failure of earthen check dams triggered by upstream flow is common in loess gullies on the Loess Plateau of China. However, studies on the formation mechanism of progressive failure are still unclear. To investigate the failure modes and progressive failure process of earthen check dams, a physical model test on an earthen dam influenced by upstream flow was conducted by monitoring and analyzing hydrologic and mechanical parameters, including water content, pore water pressure, soil stress, and displacement. The test results indicate that the progressive failure process of earthen dams is induced by seepage water discharged on the downstream slope, including slope slide and overtopping. Continuous seepage results in the occurrence of creep at the toe, gradually driving the deformation and sliding of the dam slope. The progressive failure begins in the downstream slopes, and this study focuses on analyzing the initiation mechanism of slope slide. The slope failure presents retrogressive sliding, including four repeated slip failures, and each sliding presents a long-time progressive process. This physical model test reproduces the entire life cycle of earthen check dams and reveals the traction sliding mechanism of dams, which is consistent with field observation. The aforementioned results provide an important reference for understanding the failure mechanism of earthen check dams triggered by upstream flow.

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Physical modeling into outflow hydrographs and breach characteristics of homogeneous earthfill dams failure due to overtopping

Cited by 9 publications

References 51 publications

An evaluation of small-scale irrigation schemes infrastructure

An evaluation of small-scale irrigation schemes infrastructure

Potential Dam Breach Flood Hazard Assessment of Kulekhani Reservoir Rock Fill Dam Using 2D Diffusion and Full Dynamic Shallow Water Equation Defining Coriolis Effect

Experimental Investigation on Failure Modes and Progressive Failure Process of Earthen Check Dam Triggered by Upstream Flow

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