Experiment for the Destructive Mechanism of the Overflow Levee and Flooding Area at the Chiyoda Experimental Channel

Shimada, Tomonori; Yokoyama, Hiroshi; Hirai, Yasuyuki; Miyake, Hiroshi

doi:10.2208/jscejhe.67.i_841

Cited by 4 publications

(7 citation statements)

References 1 publication

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“…The main items for observation are shown in Table 2. Equipment and techniques used for the observation were those that had been verified for their usefulness in preliminary experiments 6) . The details of the chronological changes in discharge were discussed in a previous report 6) .…”

Section: Outline Of the Experimentsmentioning

confidence: 99%

“…As shown in Fig. 1, the Chiyoda Experimental Flume 2),3) allows field-scale levee breach experiments to be conducted 4),5), 6) , using the lateral overflow from the channel that is seen on actual rivers. By using the Chiyoda Experimental Flume, it is possible to observe the process of levee breach and flooding following such breach by flooding after the occurrence of lateral overflow by conducting field-scale experiments.…”

Section: Introductionmentioning

confidence: 99%

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Quantification of Levee Breach Volume Based on Levee Breach at the Chiyoda Experimental Flume

et al. 2014

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In recent years, disasters caused by typhoons, localized downpours, and other phenomena have occurred frequently, and concern over the risk of large-scale water damage caused by river flooding has risen. Although damage resulting from levee breach is particularly serious, there is a lack of technical data on the mechanism behind that phenomenon. Accordingly, this mechanism needs to be clarified to reduce the risk of flood damage. We examined the relationship between the quantification of the levee breach volume and hydraulic parameters. In the widening stage of levee breach, the breach phenomenon can be described in terms of the traction of soil masses from the levee body as a result of flood flow. It was also found that the relationship between the extent of dimensionless levee collapse and dimensionless traction force around the mouth of the breach can be expressed in a form similar to that of the bed load formula.

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Section: Outline Of the Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantification of Levee Breach Volume Based on Levee Breach at the Chiyoda Experimental Flume

et al. 2014

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“…Previous studies on levees can be grouped into three research trends: (1) investigations of the mechanism of overflow-induced levee breach and infiltration characteristics of different levee materials [5][6][7][8][9][10][11][12], (2) analysis of seepage and breach behaviors by inserting sensors into a levee [13][14][15][16], and (3) stability analysis of levees with different combinations of reinforcing materials [17,18].…”

Section: Introductionmentioning

confidence: 99%

Biopolymer-Reinforced Levee for Breach Development Retardation and Enhanced Erosion Control

Kang

2020

Water

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This study proposes an earthen levee reinforcement method with a new biopolymer-based material to prevent levee scour and breach. It is an eco-friendly method that can efficiently protect the levee slope as it enhances soil strength, even at a very low concentration of biopolymer, and has high resistance to surface runoff in addition to promoting vegetation growth. The function and effectiveness of this method were demonstrated through an overflow-based semi-scale experiment in a previous study. In this study, we examined the effect of biopolymer-mixed soil layer on levee stability against an overflow-induced breach. In these experiments, biopolymer-mixed soils were sprayed on the crest and land-side levee surface. Two full-scale tests were conducted (2.5–2.7 m high and 14 m wide on bottom). Case 1 (control case) consisted of bare sand without any treatment, while Case 2 consisted of a 1.0% biopolymer-mixed soil sprayed on the crest and landside slope of the levee and turf put on it. By applying an image analysis technique, we analyzed the breach phenomenon and breach retardation effect of the levee treated with a biopolymer and covered with vegetation. In this experiment, the slope loss rate of Case 2 was retarded 1.5 to 2.3 times over time as compared to Case 1. During the experiment, we observed that soil erosion followed through the narrow water channel formed by the stripped turfs. This means that the grasses did not root firmly enough to protect the surface. In this regard, although the experimental results may seem unsatisfactory, the biopolymer was found to help improve erosion retardation. In 2020, we will conduct more experiments with different compositions and concentrations of the biopolymer regardless of levee vegetation. With this research, we expect to confirm that the new technology of using biopolymer-treated soils is promising for solving the levee overflow breach problem.

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“…In the experimental studies, bed deformations in both model and real scales were measured to understand the mechanism of dike erosion processes 1), 2) and levee breach widening 3), 4), 5), 6) . Schmocker and Hager 1) investigated the dike breaching processes for various types of model scale and discussed test repeatability, side wall effect, and scale effects.…”

Section: Introductionmentioning

confidence: 99%

“…3), 5), 6) carried out a real scale experiment at the Chiyoda experimental channel. However, the sectional conditions of embankment were limited in the experimental studies, and the dike breaching process in arbitrary sections could not be examined.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Dike Erosion Process Due to Overtopping Flow

et al. 2014

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Dike failures due to overtopping flows have recently occurred during floods. It is of great importance to understand the mechanism of dike failure processes and to predict dike erosion accurately for disaster mitigation. In this study, a numerical model to simulate dike breaching is developed based on a three-dimensional flow model in porous media and density function methods, and a non-equilibrium sediment transport model. Infiltration into a dike is also considered in the simulation. First, a numerical model is applied to flows over a solid embankment in order to validate the flow model. Then, dike erosion processes are simulated. Compared with the previous experimental results, it is shown that the numerical model can reproduce overflows and dike failure processes reasonably.

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Experiment for the Destructive Mechanism of the Overflow Levee and Flooding Area at the Chiyoda Experimental Channel

Cited by 4 publications

References 1 publication

Quantification of Levee Breach Volume Based on Levee Breach at the Chiyoda Experimental Flume

Quantification of Levee Breach Volume Based on Levee Breach at the Chiyoda Experimental Flume

Biopolymer-Reinforced Levee for Breach Development Retardation and Enhanced Erosion Control

Numerical Simulation of Dike Erosion Process Due to Overtopping Flow

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