Observations of low-frequency temporal and spatial coherence in shallow water.
Measurements of temporal and spatial coherence are most always confounded by the presence of multipath interference. Here, two sets of data are presented that allow separation of arrivals from individual propagating modes and then unambiguous computations of temporal and spatial coherence free of multipath effects. A consistent finding for surface reflected bottom reflected (SRBR) modes is that lower order mode are more coherent in both time and space than higher order (steeper) modes. Also, SRBR paths are much more coherent than refracted bottom reflected mode groups that cannot be separated in time and are affected by multi-mode interference.
DeFerrari
Harry A
HA
Division of Applied Marine Physics, RSMAS-University of Miami, Miami, Florida 33149, USA. hdeferrari@rsmas.miami.edu