- Tytuł:
- The Simultaneous Occurrence of Logarithmic and S-Shaped Velocity Profiles in Gravel-Bed River Flows
- Autorzy:
-
Franca, M. J.
Lemmin, U. - Powiązania:
- https://bibliotekanauki.pl/articles/241179.pdf
- Data publikacji:
- 2009
- Wydawca:
- Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
- Tematy:
-
field measurements
gravel-bed river flows
velocity profiles - Opis:
- Based on Acoustic Doppler Velocity Profiler (ADVP) field measurements, we discuss velocity profiles observed in two shallow gravel-bed rivers with low relative submergence. In these flows, log-shaped profiles and s-shaped profiles simultaneously exist, indicating the possibility of 3D flow inside the roughness layer. A quasi-2D layer is generally found in an intermediate region of the flow above the roughness layer. Therefore a best-fit log-law approach may lead to estimates of a roughness parameter which are reasonably correlated with the local flow resistance. However, above a certain limit of the ratio roughness/water depth (∼0.6 from our measurements), the velocity distribution in the lower regions predominantly corresponds to an s-shaped profile.
- Źródło:
-
Archives of Hydro-Engineering and Environmental Mechanics; 2009, 56, 1-2; 29-41
1231-3726 - Pojawia się w:
- Archives of Hydro-Engineering and Environmental Mechanics
- Dostawca treści:
- Biblioteka Nauki
Artykuł