Changed topography

The shaping of the landscape topography can be used to form hills, berms or strategically shielded valleys. Earth berms along major infrastructure constitute a well-known application1. The detailing of berms in terms of shape and use of vegetation material can have a substantial effect on performance2.

 

References:
1MTH. Noise control earth berms: Guidelines for the use of earth berms to control highway noise. British Columbia: Ministry of Transportation and Highways, 1997.
2HOSANNA. Novel Solutions for Quieter and Greener Cities. Bandhagen: EU FP7, 2013.