Experimental Study on Velocity Profiles with Different Roughness Elements in a Flume

• Autorzy: Wang X.-K. , Ye Ch. , Wang B.-J. , Yan X.-F.

Identyfikatory

DOI

10.1515/acgeo-2015-0063

• Języki publikacji: EN

Abstrakty

EN

The classical log law for velocity profile is applied to engineering practice. Field observations indicate that the composition of the bed materials obviously influences the shape of vertical velocity distribution. To clearly understand the roughness effect, six types of materials were laid separately at various depths for the investigation of the effects of roughness elements on the vertical velocity distribution. A down-looking 3D acoustic Doppler velocimeter was used to measure the velocity profiles. The experimental results showed that the curve characteristics of velocity profiles are strongly dependent on the roughness scale and related flow parameters. If d/R, Fr, and Re are larger than 0.15, 0.47, and 60 000, respectively, the velocity distribution may resemble an S-shape profile. The inflexion position Z*/H for a given S-shape profile was empirically deduced as Z*/H = -0.4481d/R + 0.3225. Otherwise, the velocity profile agrees well with the logarithmic law. The findings of this study are useful in engineering practice (i.e., depth-averaged velocity and flow rate estimate).

Słowa kluczowe

EN

velocity profiles; acoustic Doppler velocimeter; roughness elements; logarithmic law; curve

PL

profile prędkości; przepływomierz dopplerowski akustyczny; chropowatość; prawo logarytmiczne; krzywa

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2015
• Tom: Vol. 63, no. 6
• Strony: 1685--1705
• Opis fizyczny: Bibliogr. 64 poz., rys., wykr. tab.

Twórcy

autor

Wang X.-K.

• State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China

autor

Ye Ch.

• State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China

autor

Wang B.-J.

• State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China

autor

Yan X.-F.

• Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, China

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