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Evaluation of LOADEST Model Applicability for NPS Pollutant loads Estimation from Agricultural Watershed  

Shin, Min hwan (Geum-River Environment Research Laboratory)
Seo, Ji yeon (Division of Agricultural Engineering, Kangwon National University)
Choi, Yong hun (Division of Agricultural Engineering, Kangwon National University)
Kim, Jonggun (Division of Agricultural Engineering, Kangwon National University)
Shin, Dongsuk (Geum-River Environment Research Laboratory)
Lee, Yeoul-Jae (Geum-River Environment Research Laboratory)
Jung, Myung-Sook (Han-River Environment Research Laboratory)
Lim, Kyoung Jae (Division of Agricultural Engineering, Kangwon National University)
Choi, Joongdae (Geum-River Environment Research Laboratory)
Publication Information
Journal of Korean Society on Water Environment / v.25, no.2, 2009 , pp. 212-220 More about this Journal
Abstract
In many studies, the Numeric Integration (NI) method has been widely used to calculate pollutant loads from the watershed because it is easy to apply. However, there have been many needs for more accurate pollutant loads estimation method with the restricted number of water quality samples. However, the ESTIMATOR model does not allow the users to define the regression model to explain the measured flow and water quality relationship, indicating the ESTIMATOR model is not flexible. The LOADEST model allows the user to choose the model type from 11 predefined general forms of regression equations. Annual loads of T-N and T-P with the LOADEST model were 0.70 times and 0.84 times of those by NI method, respectively. The coefficient of determination ($R^2$) of the LOADEST regression for the T-N and T-P were 0.92 and 0.72, respectively. This indicates that the load estimation regression model with the LOADEST for the study watershed explains the relationship between the observed flow and water quality data well reasonably well. Based on these findings, we suggest that the LOADEST model estimated regression equation could be used to estimate pollutant loads using the measured flow data for the study watershed.
Keywords
ESTIMATOR model; LOADEST model; Numeric IntegrationI method; Pollutant loads;
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Times Cited By KSCI : 3  (Citation Analysis)
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1 Cohn, T. A. (2005). Estimating Contaminant Loads in Rivers : An Application of Adjusted Maximum Likelihood to Type I Censored Data. Water Resources Research, 41(8), pp. 13   DOI   ScienceOn
2 Gilroy, E. J., Hirsch, R. M. H., and Cohn, T. A. (1990). Mean Square Error of Regression-Based Constituent Transport Estimates. Water Resources Research, 26(9), pp. 2069-2077   DOI
3 최중대, 이찬만, 최예환(1999). 토지이용이 농업소유역의 수질에 미치는 영향. 한국수자원학회논문집, 32(4), pp. 501-510   과학기술학회마을
4 Cohn, T. A., Caulder, D. L., Gilroy, E. J., Zynjuk, L. D., and Summers, R. M. (1992a). The validity of a simple log-linear model for estimating fluvial constituent loads: An empirical study involving nutrient loads entering Chesapeake Bay. Water Resources Research, 28(9), pp. 2353-2363   DOI
5 Shin, Y. C., Heo, S. G., Lim, K. J., and Choi, J. D. (2005b). Evaluation of Applicability of the ESTIMATOR Model for the Analysis of Nutrient Load Characteristics. Journal of the Korean Society of Agricultural Engineers, 47(7), pp. 67-75   DOI
6 Donato, M. M. and MacCoy, D. E. (2005). Scientific Investigations Report Phosphorus and Suspended SedimentLoad Estimates for the Lower Boise River, Idaho, 1994~2002. Scientific U.S. Geological Survey, Reston, Virginia
7 환경부(2008). 수질오염총량관리제. 고시.훈령.규정집
8 Shin, Y. C., Heo, S. G., Lim, K. J., and Choi, J. D. (2005a). Analysis of Pollutant load Characteristics from Small Agricultural Watershed using ESTIMATOR Model. Journal of Environmental Research (Kangwon Univ.), 2, pp. 37-41
9 노상덕, 김장현, 이대근, 김선주, 손병용, 전양근, 횡성호 (2006). 유역의 비강우시 및 강우시 오염물질 유출특성. 수질보전 한국물환경학회지, 22(4), pp. 695-705
10 Haggard, B. E., Soerens, T. S., Green, W. R., and Richards, R. P. (2003). Using regression methods to estimate stream phosphorous loads at the Illinois river. American Society of Agricultural Engineers, 19(2), pp. 187-194
11 환경부(2006). 물환경관리 기본계획
12 신민환, 신용철, 허성구, 임경재, 최중대(2007). 농업 및 산림유역의 강우유출수 유량가중평균농도 분석. 한국농공학회지, 49(6), pp. 3-9   과학기술학회마을   DOI
13 Cohn, T. A., DeLong, L. L., Gilroy, E. J., Hirsh, R. M., and Wells, D. K. (1989). Estimating constituent loads. Water Resources Research, 25(5), pp. 937-942   DOI
14 환경부(1996). 환경부제정 수질공정시험법
15 Roman-Mas, A., Stogner, R. W., Doyle, U. H., and Klaine, S. J. (1994). Assessment of agricultural non-point source pollution and Best Management Practices for the Beaver Creek watershed, west Tennessee. In G. L. Pederson (ed.) Proceedings, American Water Resources Association National Symposium on Water Quality, Nashville, TN, April 17-20, 1994. American Water Resources Association, Bethesda, MD
16 Cohn, T. A., Gilroy, E. J., and Baier, W. G. (1992b). Estimating fluvial transport of trace constituents using a regression model with data subject to censoring. Proceedings of the Joint Statistical Meeting, Boston, pp. 142-151
17 Runkel, R. L., Crawford, C. G., and Cohn, T. A. (2004). Load estimator (LOADEST): A FORTRAN program for estimating constituent loads in streams and rivers: U.S. Geological Survey Techniques and Methods, Book 4, Chapter A5, pp. 69