By Benz Kotzen
Environmental Noise Barriers is a special one-stop reference for practitioners, even if acoustical engineers, panorama architects or brands, and for highways departments in neighborhood and principal professionals. This greatly revised re-creation is up-to-date in keeping with united kingdom and european laws and overseas provision of barriers.
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Extra info for Environmental noise barriers: a guide to their acoustic and visual design
Objectives can be set in terms of absolute levels (levels not to exceed 68 dB L A10,18h), relative levels (allow no more than 5 dB increase in noise) or in terms of the signiﬁcance criteria set for the assessment of the scheme. The signiﬁcance criteria are used as part of the ﬁnal assessment of the scheme, but must be known during the design stage in order that the relative importance of the various environmental effects of the scheme can be properly evaluated. Signiﬁcance criteria are deﬁned using descriptors such as minor, moderate and major to describe both the positive and negative effects of the scheme and may take account of the nature of the area affected by these changes.
Here, a viaduct crosses high above the River Aare. Most views to the viaduct are from the surrounding hillsides and the valley below. The strategic nature of the views has been acknowledged by varying the use of barrier materials relative to the visibility of the trafﬁc on the viaduct. Where views of the trafﬁc are less intrusive, a barrier of transparent acrylic sheeting is employed, thereby maintaining the integrity of the form of the viaduct. On the other hand, where views of the trafﬁc are deemed to be undesirable, the barrier is made from opaque perforated aluminium.
Ising and Michalak25 reported that increased stress caused by noise induced communication disturbance results in changes in blood pressure, which in turn can lead to gastro-intestinal disease, hypertension and other heart and circulatory diseases. 26–28 studied the effects of exposure to trafﬁc noise on large samples of men in various cities and reported an increased incidence of a range of heart diseases. Design process The realisation of any road or rail infrastructure project is a complex and iterative process.