Turbulent flow over a dune: Green River, Colorado

被引:72
|
作者
Venditti, JG
Bauer, BO
机构
[1] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA
[2] Univ British Columbia, Dept Geog, Vancouver, BC V6T 1Z2, Canada
[3] Univ So Calif, Dept Geog, Los Angeles, CA 90089 USA
关键词
fluvial bedforms; dunes; spectral analysis; turbulence; Strouhal number;
D O I
10.1002/esp.1142
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Detailed echo-sounder and acoustic Doppler velocimeter measurements are used to assess the temporal and spatial structure of turbulent flow over a mobile dune in a wide, low-gradient, alluvial reach of the Green River. Based on the geometric position of the sensor over the bedforms, measurements were taken in the wake, in transitional flow at the bedform crest, and in the internal boundary layer. Spatial distributions of Reynolds shear stress, turbulent kinetic energy, turbulence intensity, and correlation coefficient are qualitatively consistent with those over fixed, two-dimensional bedforms in laboratory flows. Spectral and cospectral analysis demonstrates that energy levels in the lee of the crest (i.e. wake) are two to four times greater than over the crest itself, with minima over the stoss slope (within the developing internal boundary layer). The frequency structure in the wake is sharply defined with single, dominant peaks. Peak and total spectral and cross-spectral energies vary over the bedform in a manner consistent with wave-like perturbations that 'break' or 'roll up' into vortices that amalgamate, grow in size, and eventually diffuse as they are advected downstream. Fluid oscillations in the lee of the dune demonstrate Strouhal similarity between laboratory and field environments, and correspondence between the peak frequencies of these oscillations and the periodicity of surface boils was observed in the field. Copyright (c) 2005 John Wiley D Sons, Ltd.
引用
收藏
页码:289 / 304
页数:16
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