Sonic Characterisation of Water Surface Waves
This paper discusses the development of an acoustic device to estimate the dynamic surface profile of channel flow. The work builds on previous observations by Cooper et al. (2006) which suggest that the response of the scattered acoustic signal from a water surface is related to hydraulic conditions by energy losses within the flow. Temporal analysis of reflected acoustic intensity is used to estimate the scale of dynamic surface features, while analysis of excess attenuation spectra is developed as a potential method of describing the statistical shape of time-averaged spatially-variant surface features. The temporal analysis shows a strong trend between the range of surface movement. and the range of reflected acoustic intensity. Analysis of excess attenuation spectra is shown to estimate the size of static surface features with little error for a given range of surface features per unit length with geometry analogous to a water surface. This suggests that the method can be used to capture the static component of water surfaces. Such an achievement will allow for remote and inexpensive measurement and monitoring of real channel flows, and may facilitate deductions of flow parameters such as flow rate, depth, turbulence and bed topography among others.
A.Nichols K.Horoshenkov S.Shepherd K.Attenborough S.Tait
School of Engineering, University of Bradford, UK Acoustic Research Group, Open University, UK
国际会议
南京
英文
40-47
2010-09-13（万方平台首次上网日期，不代表论文的发表时间）