2005, Vol.14, No.5

Journal of Environmental Impact Assessment 2023 KCI Impact Factor : 0.51

pISSN : 1225-7184
https://journal.kci.go.kr/kseia

Road traffic noise has increasing broader effects on urban areas as well as rural areas becauseof rapidly increasing traffic volume and newly-constructed roads. 10 sites in buildingdevelopment areas were selected and the noise level were measured by the apartment floorsand by the various block plans of apartment complex. Analysis result, about correction factor, in the case of right angle arrangement, apply －2.5dB(A). In the case of apartment house correlation of each floor apply 1st floors 0dB(A), 2stfloors 1.2dB(A), 3st floors 2.1dB(A), 4st floors 2.6dB(A), 5st floors 2.7dB(A), 6st floors 2.7dB(A),7st floors 2.4dB(A), 8st floors 2.0dB(A), 9st floors 1.6dB(A), 10st floors 1.1dB(A), 13st floors0.2dB(A), 15st floors 0.5dB(A). The level of road traffic noise in the arrangement construction ofright angle was about 3.0dB(A) at N-4 point and 2.1dB(A) at N-6 point lower than that of a plan figure, respectively. The results suggested that application of correction coefficient obtained by the apartment floor and by the arrangement construction can be improved in road traffic noise.

In summer and early autumn, eutrophication occurs occasionally in many reservoirs. Lakeside macrophyte which is one of internal pollutants effects on water quality when it issubmerged during water surface is rising after rainy season. This study include examination ofpollutant load, species of plant, community structure and productivity of macrophyte in unitarea at lakeside. The result of this research will be used as a guideline of water qualitymanagement on reservoir through assessing water quality effect of submerged plant. The arealdistribution, composition of species and submerged area of macrophyte changes according torainfall pattern every year, so it is difficult to calculate nutrient load annually from submergedmacrophyte. In this study, the nutrient load from submerged macrophyte assess fromDaecheong and Juam reservoir in 2001. TN and TP load of submerged macrophyte shows0.043% and 0.069%, respectively, of annual discharge load on Daecheong watershed. At lakeJuam, TN and TP shows 0.64% and 1.28% load, respectively. The reason that nutrient load oflake Juam is greater than that of lake Daecheong is that macrophyte distribution area of lakeJuam is 5 times greater than that of lake Daecheong. Total nutrient load of lake Daecheong is 3times greater than that of lake Juam.

In this study, the major emission procedures and emission characteristics were identified atthe site of sewage treatment plant which is one of the major sources of ammonia. At the sametime the emission factors and emission rates were estimated. In order to calculate the emissionflux, we used a Dynamic Flux Chamber(DFC), which is found to be a proper sampling devisefor area sources such as sewage treatment plant.It was found that the most stable sampling condition was when the stirrer’s speed of DFCwas 120RPM, and it would be the best time to take a sample 60 minutes later after setting thechamber.The relatively higher flux was shown in Autumn compared to summer and winter.Annual ammonia emission rates procedures were calculated as 906.32 mg/activity-ton,1,114.72 mg/activity-ton and 437.53 mg/activity-ton each at the primary settling basin, aerationbasin and the final settling basin, respectively. The ammonia emission rate the highest at in theaeration basin according to this test. This results was due to that the surface of aeration basin orthe final settling basin is relatively wider than the primary settling basin.