Song, Song ; Schmalz, Britta ; Fohrer, Nicola (2017)
Improved structure of vertical flow velocity distribution in natural rivers based on mean vertical profile velocity and relative water depth.
In: Hydrology Research
doi: 10.2166/nh.2017.258
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Logarithmic, power, and parabolic distribution laws were proven to be efficient for the prediction of vertical velocity distribution. Traditionally, the distribution formulas involve the friction velocity (u*) and the depth (y) of the measurement point. The low availability of friction velocity and limitation of real water depth data hindered the promotion and comparison of the available flow velocity formulas. In this paper, we proposed new formula structure adopting a relative flow velocity based on mean vertical velocity (u/ū) and dimensionless relative water depth (y/H). The observations showed that: 1) the substitution of u* and y with u/ū and y/H were reliable and applicable, and parabolic logarithmic and power fitting curves worked well, with an error of 7%, 10%, and 11%, respectively; 2) in water depth direction, the predicted results of the middle depth of the vertical profiles tend to be more reliable and precise. The highest estimated error appeared in the area near the water surface; 3) higher catchment slope resulted in larger coefficients and constants in logarithmic and power fitting; 4) in the rivers with higher width-to-depth ratio, the maximum profile velocity occurred closer to the water surface, and mean profile velocity tended to happened more at the bottom.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Song, Song ; Schmalz, Britta ; Fohrer, Nicola |
| Art des Eintrags: | Bibliographie |
| Titel: | Improved structure of vertical flow velocity distribution in natural rivers based on mean vertical profile velocity and relative water depth |
| Sprache: | Englisch |
| Publikationsjahr: | 21 August 2017 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Hydrology Research |
| DOI: | 10.2166/nh.2017.258 |
| URL / URN: | http://hr.iwaponline.com/content/early/2017/08/21/nh.2017.25... |
| Kurzbeschreibung (Abstract): | Logarithmic, power, and parabolic distribution laws were proven to be efficient for the prediction of vertical velocity distribution. Traditionally, the distribution formulas involve the friction velocity (u*) and the depth (y) of the measurement point. The low availability of friction velocity and limitation of real water depth data hindered the promotion and comparison of the available flow velocity formulas. In this paper, we proposed new formula structure adopting a relative flow velocity based on mean vertical velocity (u/ū) and dimensionless relative water depth (y/H). The observations showed that: 1) the substitution of u* and y with u/ū and y/H were reliable and applicable, and parabolic logarithmic and power fitting curves worked well, with an error of 7%, 10%, and 11%, respectively; 2) in water depth direction, the predicted results of the middle depth of the vertical profiles tend to be more reliable and precise. The highest estimated error appeared in the area near the water surface; 3) higher catchment slope resulted in larger coefficients and constants in logarithmic and power fitting; 4) in the rivers with higher width-to-depth ratio, the maximum profile velocity occurred closer to the water surface, and mean profile velocity tended to happened more at the bottom. |
| Fachbereich(e)/-gebiet(e): | 13 Fachbereich Bau- und Umweltingenieurwissenschaften 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut Wasserbau und Wasserwirtschaft 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut Wasserbau und Wasserwirtschaft > Fachgebiet Ingenieurhydrologie und Wasserbewirtschaftung |
| Hinterlegungsdatum: | 31 Jul 2018 06:45 |
| Letzte Änderung: | 31 Jul 2018 06:45 |
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