A Study on Similarity Law of Distorted River Models With Alternate Bar Beds

Uchijima, Kunihide; Hayakawa, Hiroshi

doi:10.2208/jscej.1993.479_71

Cited by 3 publications

(5 citation statements)

References 15 publications

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“…Model scales, subscript R, refer to the ratio of prototype to model conditions. Because of laboratory space constraints, we adopted the distorted model channel experimental method [10], with a difference in the ratio of horizontal and vertical scale between the prototype and the model. This method focuses on the reproducibility of bed forms during the examination of moving riverbed fluctuations.…”

Section: Experimental Overviewmentioning

confidence: 99%

“…Due to laboratory space constrains, the horizontal scale ration of the channel width B is set to B R = B P /B M = 200 and a grain diameter of d M = 0.59 (mm) is used due to the requirement not to form sand ripples on the bed waves; this meets the similarity conditions shown in Table 1. Moreover, the scale ratio of the flow rate Q R is as indicated in the following equation [10].…”

Section: Experimental Overviewmentioning

confidence: 99%

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Self-Adjustment Process of Flow Pathway in a Narrow Curved Channel

2018

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This study focuses on river bed fluctuation of the curved channel with channel width narrowing, where is located in the inlet of the old meandering river with 30 (m) width from straightened one with 80 (m) in the Kushiro Wetland. From field survey, in response to change in water and sediment discharges, significant streamwise variation in water flow width in the curved channel adjusts in order to establish the dynamic equilibrium. Along the outer bank of curved channel, the secular bed deposit beside the outer bank is increasing, and as a result, the main streamline flows into the old river along the inner bank as left bank. Moreover, this narrowing curved channel easily leads to overspill some flood water including rich suspended sediment and to deposit some fine sand near channel side flood plain. We intend to explain above significant bed variations by using movable bed experiments with the distorted model. As a result, we suggest, though qualitatively, that the existence of the sandbar upstream of the curved channel causes the autonomous specification of the flow path width in the curved channel with a narrowing width, and that this flow path is formed.

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Section: Experimental Overviewmentioning

confidence: 99%

Section: Experimental Overviewmentioning

confidence: 99%

Self-Adjustment Process of Flow Pathway in a Narrow Curved Channel

2018

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“…(29)-(35), which ware obtained according to Eqs. (27), (28), (7), (8) and the Manning-Strickler formula (U/u * = 6.0 (h/d) 1/6 ), are also listed in Table 1 (detailed information about the derivation refers to Uchijima, K. and H. Hayakawa, 1993).…”

Section: Eqations and Their Solutions For Similarity Conditionsmentioning

confidence: 99%

“…For this reason, it is necessary for a distorted river model with a movable bed to develop new similarity laws that are easy to use and do not have the drawbacks mentioned above. As a result, Uchijima derived similarity laws by assuming that the values of the dual dimensionless parameters of Sukegawa's regime-criterion diagram for the bars (Sukegawa, 1972) of the model were equal to those of a prototype (Uchijima et al, 1993;Uchijima, 1995). Furthermore, satisfactory verification results were obtained by performing several distorted-model experiments (Uchijima et al, 1995(Uchijima et al, , 1997.…”

Section: Introductionmentioning

confidence: 99%

Prediction of bed variation during a flood by distorted model experiments with a movable bed

Wei

Xun

Xiao

et al. 2010

2010 3rd International Congress on Image and Signal Processing

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Theoretical backing of the similarity laws obtained from the dual dimensionless parameters of the bed-form classification diagram is given by solving the equations of similarity conditions that are obtained from the 1-dimensional equation of motion, the continuity equation, the bed deformation equation, and the formula of bed-load transport. Furthermore, a distorted model experiment was conducted to predict the bed variation during a flood in the Chubetsu River (a tributary of the Ishikari fiver in Hokkaido, Japan). The usefulness of the similarity laws of a distorted model was ascertained, and it was found that the maximum scour depth occurs during a recession of the flood hydrograph.

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“…For this reason, it is necessary for a distorted river model with a movable bed to develop new similarity laws, which are easy to use and do not have the drawbacks mentioned above. Then Uchijima derived similarity laws by assuming that the values of the dual dimensionless parameters of Sukegawa's regime-criterion diagram for the bars (Sukegawa, 1972) of the model are equal to those of a prototype (Uchijima et al, 1993, Uchijima, 1995. Furthermore, satisfactory verification results were obtained by performing several distorted model experiments (Uchijima et al, 1995(Uchijima et al, , 1997.…”

Section: Introductionmentioning

confidence: 99%

Similarity Laws of Distorted Model with a Movable Bed and its Validity

Wei

Xun

Xiao

et al. 2011

AMR

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The theoretical backing of the similarity laws obtained from dual dimensionless parameters of the bed-form classification diagram is given by solving the equations of similarity conditions which is obtained from 1-Dimensional equation of motion, continuity equation, bed deformation equation and the formula of bed load transport. Secondly, the validity of the similarity laws is confirmed by comparing the bed form of distorted model experiment with that of undistorted model experiments performed by Hokkaido Development Bureau (H.D.B.). And also the fact that the height of bar in a gentle curved river channel can be estimated by the result of distorted model of straight flume is found.

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A Study on Similarity Law of Distorted River Models With Alternate Bar Beds

Cited by 3 publications

References 15 publications

Self-Adjustment Process of Flow Pathway in a Narrow Curved Channel

Self-Adjustment Process of Flow Pathway in a Narrow Curved Channel

Prediction of bed variation during a flood by distorted model experiments with a movable bed

Similarity Laws of Distorted Model with a Movable Bed and its Validity

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