수질오염총량제 시행 이후 낙동강수계 41개 지점의 BOD와 T-P의 목표수질과초과율의 공간변화 분석

Abstract

The objective of this study was to assess spatial variation of the target water quality criteria and excess rate in Nakdong river basin after the TotalMaximum Daily Loads (TMDLs). For this, 41 total water quality monitoring stations were selected BOD and T-P data were collected from 2003 to2019. The annual average water quality of BOD and T-P were calculated and compared with the target water quality for each stations by peroid. Asa result of analyzing the BOD, Kumho A, Nakbon F, Namgang D, Miryang B, Wicheon B and Hoecheon A exceeded the target water quality criteriafor two consecutive times. For T-P, Nakbon N, Naeseung B, Miryang A, Hwanggang A and Hoecheon A exceeded the target water quality criteriatwice in a row. In the case of T-P, the target water quality excess rate was relatively low after the TMDLs implementation compared to before theTMDLs implementation. However, in the case of BOD, there was no difference in the target water quality excess rate before and after TMDLs. Asa result, the overall annual average water quality shows a decreasing trend, but it is necessary to manage the water quality for the Nakdong river basinthat exceed the target water quality.