지양호의 오염원 및 수질 조사 = A Study on the Water Polution Sources and Quality of the Chinyang Lake

다국어 초록 (Multilingual Abstract)

The upper area of the Chinyang Lake was devided into four segments, the Gyeongho River, the Yangcheon River, the Deokcheon River and the vicinity of the Chinyang Lake. The water pollution sources and the water quality of four segments were investigated and evaluated. This region was composed of a Dong in a city and 141 Ries in 6 Guns except for Yurunggun and Namwongun. Population density is low in all area except for Hamyang Up and Sancheong Up. Population is 84.903(58%) in the vicinity of the Gyeongho River, 26,093(18%) in the Yangcheon River, 23,039(16%) in the Deokcheon River and 11,468(8%) in the Chinyang Lake.
Total occurance of BOD in the upper area of the Chinyang Lake was 45,493 ㎏/day, whose 66% was generated from domestic animals, 17% from the land and 26% from human wastes, respectively. The occurance of BOD in the views of segments analysis showed that 57.1% originated from the vicinity of the Gyeongho River, 28.4% from that of the Yangcheon River, 9.8% from that of the Deokcheon River and 4.8% from that of the Chinyang Lake. The most amount of BOD was discharged to the Gyeongho River, the second to the Deokcheon River and the least to the Chinyang Lake.
Total occurance of SS in the upper area of the Chinyang Lake was 137,445 ㎏/day. The most amount of SS was discharged to the Gyeongho River, the second to the Yangcheon River, and the least to the Chinyang Lake.
The waste of domestic animal produced the 66% of BOD and the 92% of SS in their total occurance and the 31% of BOD and the 76% of SS in their total discharge. It is concluded that the waste of domestic animal is the important pollution sources, which greatly impact the water quality of the Chinyang Lake.
Total nitrogen and phosphorous content in the water of the upstream of the Chinyang Lake were very high. The water quality of the Yangcheon and the Deokcheon River was classified as 4 grade by high pH and numbers of coliform group especially. The high nitrogen content in the upstream of the Gyeongho and the Yangcheon River implies that much nitrogen is originated from the farm land. It is found that the Chinyang Lake is in the process of the eutrophication.