Ivakin Anatoliy N, Sessarego Jean-Pierre
Applied Physics Laboratory, University of Washington, Seattle, Washington 98105, USA.
J Acoust Soc Am. 2007 Nov;122(5):EL165-71. doi: 10.1121/1.2784534.
Sound backscattering from water-saturated granular sediments at frequencies from 150 kHz to 8 MHz at oblique incidence was studied in controlled laboratory conditions. Two kinds of sediments, medium and coarse sands, were degassed, and their surface was flattened. In these conditions, the sediment granular structure can be considered as a controlling mechanism of backscattering. Comparison of frequency dependencies of backscatter for the two sediments with different mean grain size shows the existence of a persistent scaling effect that allows description of the backscattering strength as a function of one parameter, the mean grain size/wavelength ratio.
在可控的实验室条件下，研究了频率范围为150千赫至8兆赫的斜入射情况下，水饱和颗粒沉积物的声反向散射。对两种沉积物，即中砂和粗砂进行了脱气处理，并将其表面弄平。在这些条件下，沉积物颗粒结构可被视为反向散射的控制机制。对两种平均粒径不同的沉积物的反向散射频率依赖性进行比较，结果表明存在一种持续的标度效应，该效应使得可以将反向散射强度描述为一个参数（平均粒径/波长比）的函数。
