Freak Waves in the Linear Regime: A Microwave Study

被引:198
作者
Hoehmann, R. [1 ]
Kuhl, U. [1 ]
Stoeckmann, H.-J. [1 ]
Kaplan, L. [2 ]
Heller, E. J. [3 ,4 ]
机构
[1] Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany
[2] Tulane Univ, Dept Phys, New Orleans, LA 70118 USA
[3] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
[4] Harvard Univ, Dept Chem & Chem Biol, Cambridge, MA 02138 USA
关键词
DISTRIBUTIONS; STATISTICS; MEDIA;
D O I
10.1103/PhysRevLett.104.093901
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Microwave transport experiments have been performed in a quasi-two-dimensional resonator with randomly distributed conical scatterers. At high frequencies, the flow shows branching structures similar to those observed in stationary imaging of electron flow. Semiclassical simulations confirm that caustics in the ray dynamics are responsible for these structures. At lower frequencies, large deviations from Rayleigh's law for the wave height distribution are observed, which can only partially be described by existing multiple-scattering theories. In particular, there are "hot spots'' with intensities far beyond those expected in a random wave field. The results are analogous to flow patterns observed in the ocean in the presence of spatially varying currents or depth variations in the sea floor, where branches and hot spots lead to an enhanced frequency of freak or rogue wave formation.
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页数:4
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