Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Water Quality Simulation at Mulgeum of the Nakdong River using Zooplankton Community Data

동물플랑크톤 군집자료를 이용한 낙동강 물금지점의 수질모의

  • Lee, Sangho (Division of Civil Engineering, Pukyong National University) ;
  • Choi, Jung-Min (Korea Land & Housing Corporation, Land & Housing Institute) ;
  • Jeong, Kwang-Seuk (Department of Biology, Pusan National University)
  • 이상호 (부경대학교 건설공학부) ;
  • 최정민 (한국토지주택공사 토지주택연구원) ;
  • 정광석 (부산대학교 생물학과)
  • Received : 2009.02.11
  • Accepted : 2009.10.21
  • Published : 2009.11.30
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Abstract

Since construction of the estuarine barrage at the mouth of the Nakdong River, eutrophication and increased abundance of phytoplankton have occurred mainly due to the increased retention time in the reach. However, during the spring, there is a decrease in chlorophyll-a, as a result of an increase in zooplankton number, which preys upon phytoplankton and affects the value of chlorophyll-a. In order to emphasize the importance of zooplankton data in water quality simulation, zooplankton community data were used to simulate water quality and eutrophication at Mulgeum located in 27 km upstream from the barrage. WASP 7.2 was used as the water quality model for the river, using a monthly data set from 2003 to 2005 for model calibration and verification. The results showed that chlorophyll-a, DO, and total nitrogen in the river were simulated well during the verification period. The results of water quality simulation using zooplankton community data in the model were better than those with phytoplankton death rate, in terms of the absolute value of percent bias, root mean square error, and Nash-Sutcliffe efficiency. Those results indicate the use of zooplankton data provides more accurate simulation results for chlorophyll-a and eutrophication.

Keywords

Acknowledgement

Grant : 생태모형의 주요 변수 추출 및 생물 분류군의 관계 해석과 장․단기 예측에 관한 연구

Supported by : 낙동강 물환경연구소

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