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Earth Science Informatics

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10.09.2021 | Research Article

Validation of double averaged velocity method in a variable width river

verfasst von: Ehsan Shahiri Tabarestani, Hossein Afzalimehr, Quoc Bao Pham

Erschienen in: Earth Science Informatics | Ausgabe 4/2021

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Abstract

Comprehensive preview of flow characteristics and bedforms in rivers is one of the imperative purposes of river restoration projects. This study aimed to assess the application of double averaged technique for estimating the flow velocity and shear velocity in gravel bedforms by field research throughout the Babolroud River in north of Iran. Also, quadrant analysis carried out to investigate the turbulence structure over a pool-riffle bedforms. Based on data collected in a 95 m reach with variable width and using Acoustic Doppler Velocimeter (ADV), a double averaged velocity profile was obtained. This method validation was conducted by logarithmic law and also boundary layer characteristics method for shear velocity estimation within the bedform. The results demonstrate that the double averaged velocity profile was fitted on the logarithmic law in the inner layer and deviated from it in the outer layer, as was expected. On the other hand, the calculated shear velocity by two methods of logarithmic law and boundary layer characteristics was consistent and had small discrepancies, which indicates the double averaged method validity. The results of quadrant analysis illustrated the ejections and sweeps, as a dominant bursting event near the bed and water surface in the pool center, respectively.

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Titel: Validation of double averaged velocity method in a variable width river
verfasst von: Ehsan Shahiri Tabarestani
Hossein Afzalimehr
Quoc Bao Pham
Publikationsdatum: 10.09.2021
Verlag: Springer Berlin Heidelberg
Erschienen in: Earth Science Informatics / Ausgabe 4/2021
Print ISSN: 1865-0473
Elektronische ISSN: 1865-0481
DOI: https://doi.org/10.1007/s12145-021-00692-5

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