(Abstract) To increase the water in the Nakdonggang Basin, the government installed eight weir as a part of the “four-river refurbishment project” which will also be used to improve the flux and the water quality of the river. But in the case of the weir installed for the increase of water, the chan...
(Abstract) To increase the water in the Nakdonggang Basin, the government installed eight weir as a part of the “four-river refurbishment project” which will also be used to improve the flux and the water quality of the river. But in the case of the weir installed for the increase of water, the change in water quality will differ from region to region, so an over-all improvement of the quality will be difficult. According to this study, the characteristic of Nakdonggang requires different countermeasures for the improvement of each the upper-, middle-, and downstream waters. Therefore, the two analyses (the analysis of the physic-chemical change in water quality of the main stream and the analysis of the cause of green algae formation—possibly caused by the increased detention period due to the new dams) will be used as the basic data for further direction in controlling the water quality of Nakdonggang. The BOD, COD, T-N contents do not appear to show big differences before and after the weir installation. In the case of T-P and Chl-a, except for certain periods, their concentration has decreased after the installation of the weir. The water quality of the main stream between the Hap-Chun weir and the Ham-An weir, the smaller streams, and the tributaries were inspected for the purpose finding cause of green algae formation in Nakdonggang. Comparing the different water qualities of the Hap-Chun weir, Nack-Bon H, and Ham-An weir to the basic living environment standard BOD, the average BOD was 2.2mg/L which falls under the “pretty good” category. In the main stream, the BOD of the water around Ham-An weir was the highest with 2.4mg/L. Furthermore, the result of the assessment of Chl-a loading capacity shows that the loading capacity of the waters near Ham-An weir was larger compared to the waters around Hap-Chun weir, which is the upper stream of the River. For the small streams and the tributary, when the flux was small the effect of the different categories on the loading capacity was high compared to the flow capacity. In order to understand the relationship between the water contamination and the amount of Chl-a concentration, the interrelationship analysis took place using the data arranged by different seasons. The analysis shows that through all seasons BOD and COD affects Chl-a which therefore affects green algae. Multiple regression analysis related to the Chl-a concentration was enforced based on the data of the interrelation analysis, which will later enable to measure the Chl-a concentration with only an independent variable. Changing the water temperature of the mainstream using multiple regression, it was analyzed that the Chl-a changes are sensitive to the water temperature. Also, the Chl-a concentration increased in the shape of a sector.
(Abstract) To increase the water in the Nakdonggang Basin, the government installed eight weir as a part of the “four-river refurbishment project” which will also be used to improve the flux and the water quality of the river. But in the case of the weir installed for the increase of water, the change in water quality will differ from region to region, so an over-all improvement of the quality will be difficult. According to this study, the characteristic of Nakdonggang requires different countermeasures for the improvement of each the upper-, middle-, and downstream waters. Therefore, the two analyses (the analysis of the physic-chemical change in water quality of the main stream and the analysis of the cause of green algae formation—possibly caused by the increased detention period due to the new dams) will be used as the basic data for further direction in controlling the water quality of Nakdonggang. The BOD, COD, T-N contents do not appear to show big differences before and after the weir installation. In the case of T-P and Chl-a, except for certain periods, their concentration has decreased after the installation of the weir. The water quality of the main stream between the Hap-Chun weir and the Ham-An weir, the smaller streams, and the tributaries were inspected for the purpose finding cause of green algae formation in Nakdonggang. Comparing the different water qualities of the Hap-Chun weir, Nack-Bon H, and Ham-An weir to the basic living environment standard BOD, the average BOD was 2.2mg/L which falls under the “pretty good” category. In the main stream, the BOD of the water around Ham-An weir was the highest with 2.4mg/L. Furthermore, the result of the assessment of Chl-a loading capacity shows that the loading capacity of the waters near Ham-An weir was larger compared to the waters around Hap-Chun weir, which is the upper stream of the River. For the small streams and the tributary, when the flux was small the effect of the different categories on the loading capacity was high compared to the flow capacity. In order to understand the relationship between the water contamination and the amount of Chl-a concentration, the interrelationship analysis took place using the data arranged by different seasons. The analysis shows that through all seasons BOD and COD affects Chl-a which therefore affects green algae. Multiple regression analysis related to the Chl-a concentration was enforced based on the data of the interrelation analysis, which will later enable to measure the Chl-a concentration with only an independent variable. Changing the water temperature of the mainstream using multiple regression, it was analyzed that the Chl-a changes are sensitive to the water temperature. Also, the Chl-a concentration increased in the shape of a sector.
주제어
#낙동강 보 수질
※ AI-Helper는 부적절한 답변을 할 수 있습니다.