Noise Lecture2-2 Types of Noise And Environmental
Description: Noise Lecture2-2 Types of Noise And Environmental Noise Propagation Ass.Prof. Shatha AJ Ibrahim Environmental Engineering Department College of Engineering University of Al-Mustansiriyah Ground Effects Sound reflected by the ground
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slide1. Noise Lecture2-2 Types of Noise And Environmental Noise Propagation Ass.Prof. Shatha AJ Ibrahim
Environmental Engineering Department
College of Engineering
University of Al-Mustansiriyah<br>
slide6. Ground Effects
Sound reflected by the ground interferes with the directly propagated sound. The effect of the ground is different for acoustically hard (e.g., concrete or water), soft (e.g., grass, trees or vegetation) and mixed surfaces. Ground attenuation is often calculated in frequency bands to take into account the frequency content of the noise source and the type of ground between the source and the receiver. Precipitation can affect ground attenuation. Snow, for example, can give considerable attenuation, and can also cause high, positive temperature gradients. Regulations often advise against measuring under such conditions.<br>
Environmental Engineering Department
College of Engineering
University of Al-Mustansiriyah<br>
slide6. Ground Effects
Sound reflected by the ground interferes with the directly propagated sound. The effect of the ground is different for acoustically hard (e.g., concrete or water), soft (e.g., grass, trees or vegetation) and mixed surfaces. Ground attenuation is often calculated in frequency bands to take into account the frequency content of the noise source and the type of ground between the source and the receiver. Precipitation can affect ground attenuation. Snow, for example, can give considerable attenuation, and can also cause high, positive temperature gradients. Regulations often advise against measuring under such conditions.<br>