The Relationship Between Sound Field and Bottom-Reflection-Loss in Homogeneous Shallow Water

An approximate method is suggested to calculate the transmission loss of sound field in homogeneous shallow water with sea bottom,the reflection loss of which is arbitrary monotonely increasing function of angle.The shallow water layer is considered as angular filter with beamwidth,varying with distance.An "equivilent rectangular filter" method is suggested and a simple relation between angular function of bottom-reflection-loss and range dependence of transmission loss of sound field is found.For the case of approximation in linear segments,the "transition ranges" of sound field correspond to the turning points of bottom-reflection-loss curve.The angular dependence of bottom-reflection-loss can be easily calculated from the transmission loss data.Results are compared with "three-parameter-model" as a special case.