Assessment of flood risks in Pearl River Delta due to levee breaching

Zhang, Li Min; Xu, Yao; Liu, Yi

doi:10.1080/17499518.2013.790733

Cited by 21 publications

(14 citation statements)

References 7 publications

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“…Effective management of landslide risks requires the provision of breaching parameters such as breach size, peak outflow rate and breaching initiation time (e.g., Zhang, 2012b,c, 2013a,b;Zhang et al, 2013;Courage et al, 2013) and the evaluation of the effectiveness of risk mitigation measures (e.g., Peng et al, 2014). Therefore, more quantitative studies are required to understand the mechanisms of cascading dam breaching, quantify the influences of geometric, hydraulic and geological factors on dam breaching parameters, and identify critical conditions of overlapping effects.…”

Section: Introductionmentioning

confidence: 99%

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

Shi

Guan

Peng

et al. 2015

Engineering Geology

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Section: Introductionmentioning

confidence: 99%

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

Shi

Guan

Peng

et al. 2015

Engineering Geology

Self Cite

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“…For example, Typhoon Morakot hit Taiwan in 2009, causing severe river embankment failures and numerous deaths. Several mechanisms may lead to river embankment failure during flooding periods, including overtopping, toe scouring of the foundation, seepage, or piping and slope sliding of river embankments [1][2][3][4]. To reduce the risk of riverbank failure disasters, studies on river embankment failures that involve considering different failure mechanisms are required.…”

Section: Introductionmentioning

confidence: 99%

Predicting River Embankment Failure Caused by Toe Scour Considering 1D and 2D Hydraulic Models: A Case Study of Da-An River, Taiwan

Chang

Chen

Guo

et al. 2020

Water

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Physically based numerical models can predict scour depth at embankments located in bend reaches. However, methodologies for utilizing these numerical models to assess the risk of reinforced concrete embankment failure are rarely investigated. Therefore, a new assessment methodology is proposed to predict the riverbank failure caused by bend scour. The methodology is primarily based on a bend scour simulation model that integrates a one-dimensional (1D) hydraulic model, a two-dimensional (2D) hydrodynamic finite-volume model, and an empirical equation of bend scour prediction. The model was first applied to the Shuiwei Embankment located in a river bend reach of Da-An River in Taiwan and verified against results from the 1D hydraulic model and field data. The model was then used to simulate 2D flow field and the temporal evolution of bend scour depth under different return period flood events to examine the relationships between river discharge, water level, shear stress, and bend scour depth. The influence of shear stress on the stability of toe protections was also investigated. The field data (from two events) and numerical solutions (four scenarios) were assessed to conceive two empirical equations for predicting shear stress and bend scour depth. A new assessment methodology was proposed using these two equations to predict the risk of river embankment failure during flood periods. The proposed methodology can be easily applied in other disaster-prone regions to mitigate the effects of disasters caused by bend scouring.

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“…In general, embankment failure occurs during a flood as the result of several possible factors: (1) overtopping of the embankment crest; (2) scouring at the toe; (3) piping or internal erosion; and (4) toe or slope sliding of the embankment [1][2][3][4]. These potential mechanisms can result in the breaching or failure of embankments, which can occur as a single mechanism or a combination of different mechanisms.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Simulation Method for Flood-Induced Bend Scour—A Case Study Near the Shuideliaw Embankment on the Cho-Shui River

Guo

Hong

Chen

et al. 2017

Water

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Abstract:The modeling of flood-induced bend scour near embankment toes can provide important information for river engineering, embankment safety warnings, and emergency action management. During the rainy seasons, short-term general scour and bend scour are the most common causes for the failure of reinforced concrete embankments in Taiwan. To gain a deeper understanding of the scouring process near embankment foundations, this study proposed a straightforward and practical method for bend scour simulation. The proposed simulation method is subdivided into three stages: two-dimensional flow simulation, general scour estimation, and bend scour estimation. A new bend scour computation equation is proposed and incorporated into a two-dimensional hydraulic finite-volume model for simulating the evolution of bend scour depth around embankment toes. The proposed method is applied to simulate the temporal evolution of bend scouring near the Shuideliaw Embankment on the Cho-Shui River in Taiwan, where serious failure occurred during the June 2012 monsoon. Field data were gathered using the numbered-brick technique at the Shuideliaw Embankment to demonstrate the accuracy of the proposed method. The results of the bend scour simulations compared reasonably well with field measurements, indicating close agreement in terms of water levels and bend scour depths near the Shuideliaw Embankment. The proposed method was found to quickly estimate the maximum short-term general scour and bend scour depths for further enhancement of the safety of the embankment toe.

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Assessment of flood risks in Pearl River Delta due to levee breaching

Cited by 21 publications

References 7 publications

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

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

Predicting River Embankment Failure Caused by Toe Scour Considering 1D and 2D Hydraulic Models: A Case Study of Da-An River, Taiwan

A Simplified Simulation Method for Flood-Induced Bend Scour—A Case Study Near the Shuideliaw Embankment on the Cho-Shui River

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