Abstract
The study was conducted to examine noise levels influenced by differences of altitudes and elevation from ground level. The results of the study indicated that when the noise (102 db) was created at the upper part of a steep slope area, the noise levels measured at the altitudes of 5 and 10 m were 70 and 62.1 db (R$^2$=0.9533), respectively, and that when the noise (102 db) was created at the lower part of the area, the noise levels levels measured at the altitudes of 5 and 10 m were 74.6 and 71.8 db (R$^2$=0.8519), respectively. When noise was created on a nat area, the noise levels at 10, 20 and 50 meter-ranges were 76.2, 65.9 and 55.3 db (R2 =0.9854), respectively, in which the longer distances from the noise source reduced the noise levels than the shorter and especially the noise was tremendously reduced within 10 meter-range.
지형의 고저별 및 평지에서의 거리에 따른 소음도 크기변화 조사에서 급경사(상 $\longrightarrow$ 하)시 소음도는 발생지점에서 102dB, 고도 5m 하부지점에서 70.1dB, 10m 지점 62.1dB, $R^2$＝ 0.9533 였고 급경사(하 $\longrightarrow$ 상)시 소음도는 고도 5m 상부지점에서 74.6dB, 10m 지점 71.8dB, $R^2$＝ 0.8519였으며 평지에서는 발생지점에서 102dB, 10m 지점 76.2dB, 20m 지점 65.9dB, 50m 지점 55.3dB, $R^2$ = 0.9854로 거리에 따라 소음 감쇠현상이 컸으며 특히 10m 이내 지점에서의 감쇠폭이 컸다.
