Acoustic Investigations of Tidal Bores in Qiantang River

Motlagh, Masoud Bahreini; Kawanisi, Kiyoshi; Zhu, Xiao‐Hua

doi:10.2208/jscejhe.71.i_139

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…Experimental and numerical analyses showed some transient flow reversal next to the bed and close to the bore passage (Docherty & Chanson, 2012;Khezri & Chanson, 2012b;Koch & Chanson, 2009;Leng & Chanson, 2017a, 2017bLubin et al, 2010); however, this occurrence is relatively weak and related to flow separation and recirculation due to the upward deviation of the main flow at the foot of the bore (Liu et al, 2015;Lubin et al, 2010). In the case of a tidal bore, in which also the bulk flow velocity at the head of the front actually reverses (Furgerot et al, 2016;Masoud et al, 2015;Simpson et al, 2004), the reverse flow is typically much stronger. This is a very important aspect that must be considered in the experimental study of the characteristics of a tidal bore front, in order to properly assess the enhanced mixing and erosion processes related to the flow reversal at the bore passage.…”

Section: 1029/2018wr022937mentioning

confidence: 99%

Consideration of the Mechanisms for Tidal Bore Formation in an Idealized Planform Geometry

Viero

Defina

2018

Water Resources Research

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A tidal bore is a positive wave traveling upstream along the estuary of a river, generated by a relatively rapid rise of the tide, often enhanced by the funneling shape of the estuary. The swell produced by the tide grows and its front steepens as the flooding tide advances inland, promoting the formation of a sharp front wave, that is, the tidal bore. Because of the many mechanisms and conditions involved in the process, it is difficult to formulate an effective criterion to predict the bore formation. In this preliminary analysis, aimed at bringing out the main processes and parameters that control tidal bore formation, the degrees of freedom of the problem are largely reduced by considering a rectangular channel of constant width with uniform flow, forced downstream by rising the water level at a constant rate. The framework used in this study is extremely simple, yet the problem is still complex, and the solution is far from being trivial. From the results of numerical simulations, three distinctive behaviors emerged related to conditions in which a tidal bore forms, a tidal bore does not form, and a weak bore forms; the latter has a weakly steep front and after the bore formed it rapidly vanishes. Based on these behaviors, some criteria to predict the bore formation are proposed and discussed. The more effective criterion, suitably rearranged, is checked against data from real estuaries, and the predictions are found to compare favorably with the available data.

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Section: 1029/2018wr022937mentioning

confidence: 99%

Consideration of the Mechanisms for Tidal Bore Formation in an Idealized Planform Geometry

Viero

Defina

2018

Water Resources Research

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“…One of the main obstacles in utilizing acoustic instruments for the river discharge measurements, either FATS or ADCP, is the attenuation of acoustic waves [14]. The energy of an acoustic wave is evidently attenuated by increasing the distance from the source, due to the energy absorption by water molecules and the suspended particles.…”

Section: Introductionmentioning

confidence: 99%

Influence of Suspended Sediment Concentration and Particle Sizes on the Sound Attenuation of the Fluvial Acoustic Tomography Technique

Bahreinimotlagh¹,

Kawanisi

Kavousi³

et al. 2020

J. of Wat. & Envir. Tech.

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Fluvial Acoustic Tomography System (FATS) as an advanced technology acquires continuous streamflow data in rivers and estuaries even during floods. However, the acoustic signals are dramatically attenuated by suspending sediments which this problem is a new field of study. In this study, we propose a new equation to estimate the maximum applicable measurement distances (MAMDs). It is based on the cross-sectional suspended sediment concentration () and the particle sizes on the 30-kHz FATS. Our study results show that MAMD might be 2,380 m in the clear water. Moreover, the streamflow monitoring can be perfectly done while is less than 12.67 kg/m 3 with the particle radii of 3 μm, when the horizontal distance between two acoustic stations is 100 m. Also, the acoustic signals are not decayed if the particle radii equal to 20 mm and the maximum is 6.6 kg/m 3. This study highlights the performance of FATS in the presence of high and provides a better perspective of applying FATS in different rivers with high variability of .

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Continuous streamflow monitoring in shared watersheds using advanced underwater acoustic tomography system: a case study on Zayanderud River

Bahreinimotlagh¹,

Kawanisi

Sawaf

et al. 2019

Environ Monit Assess

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Acoustic Investigations of Tidal Bores in Qiantang River

Cited by 4 publications

References 17 publications

Consideration of the Mechanisms for Tidal Bore Formation in an Idealized Planform Geometry

Consideration of the Mechanisms for Tidal Bore Formation in an Idealized Planform Geometry

Influence of Suspended Sediment Concentration and Particle Sizes on the Sound Attenuation of the Fluvial Acoustic Tomography Technique

Continuous streamflow monitoring in shared watersheds using advanced underwater acoustic tomography system: a case study on Zayanderud River

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