Studies of outdoor sound over complex terrain

摘要

The efficiency of screens of various designs and of earth berms should be estimated not only in a still atmosphere but also taking into account the effect of wind. Downwind may severely reduce the insertion loss and this fact should be taken into account in the design phase. A design is only suitable if it provides a relatively high insertion loss under downwind conditions as well as in a still atmosphere. In an attempt to address this problem, scale model results showing the influence of a screen and an earth berm under different wind-conditions will be presented along with theoretical calculations based upon parabolic equation methods.