Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
권호 표지
DOI QR코드

DOI QR Code

Evaluation of Applicability of the ESTIMATOR Model for the Analysis of Nutrient Load Characteristics

  • Shin, Yong-Chul (Department of Agriculture Engeering, Kangwon National University) ;
  • Heo, Sung-Gu (Department of Agriculture Engeering, Kangwon National University) ;
  • Lim, Kyoung-Jae (Environmental Research Center, Kangwon National University) ;
  • Choi, Joong-Dae (Department of Agriculture Engeering, Kangwon National University)
  • Published : 2005.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

It has been well-known that the Nonpoint Source (NPS) pollutions are the primary contributors to water quality degradation in the receiving water bodies as well as the Point Source (PS) pollutions. To develop an effective management practice for water quality improvement, pollutant loads must be first estimated. In many studies, the Numeric Integration (NI) method has been used because of its ease of application, irrespective of the total number of samples collected for each storm event. Thus, there have been needs for more accurate pollutant load estimation with a limited number of water quality samples. In this study, NI method and regression method using the USGS ESTIMATOR model were comparatively used to calculate the pollutant loads for the Wolgokri watershed, Gangwon Province. The $NO_{3}$-N, T-N, and T-P loads using NI method and ESTIMATOR model were 13.85 kg/ha, 45.92 kg/ha, and 1.887 kg/ha, and 11.93 kg/ha,43.20 kg/ha, and 1.650 kg/ha, respectively. The estimated loads using ESTIMATOR model were lower than those using NI method by $86\%$, $94\%$, and $87\%$. These discrepancies in the estimated loads using a different load estimation method could be explained in that the total number of samples were not sufficient enough for NI method. Thus, ESTIMATOR model is recommended for the frequently stream discharge and less frequently measured water quality data.

Keywords

References

  1. Choi, J. D., 1997, Effect of rural watershed management on the discharge of NPS pollutants to streams. Journal of Rural Development, 1, pp. 91-107
  2. Choi, J. D., Lee, C. M., and Choi, Y. H., 1999. Effect of land use on the water quality of small agricultural watersheds in Kangwon-do. Korea Water Resources Association, 32(4), pp. 501-510
  3. Choi, J. D., 2003. Pollutant load reduction effect analysis by environmentally sound agricultural managements. 40-91, Hanam, Gyeonggi: Han River Basin Environmental Office
  4. 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 https://doi.org/10.1029/WR025i005p00937
  5. Cohn, T. A., Caulder, D. L., Gilroy, E. J., Zynjuk, L. D., and Summers, R. M., 1992. 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 https://doi.org/10.1029/92WR01008
  6. Ferguson, R. I., 1986. River loads underestimated by rating curves. Water Resources Research, 22, pp. 74-76 https://doi.org/10.1029/WR022i001p00074
  7. Haggard, B. E., Soerens, T. S., Green, W. R., and Richards, R. P., 2003. Using regression methods to estimate stream phosphorus loads at the Illinois river, Arkansas, American Society of Agricultural Engineers, 19(2), pp. 187-194
  8. Koch, R. W., and Smillie, G. M., 1986. Bias in hydrologic prediction using log-transformed regression models. Water Resources Bulletin, 22, pp, 717-723 https://doi.org/10.1111/j.1752-1688.1986.tb00744.x
  9. Magette, W. L., T. H., Wood, J. D., Weismiller, R. A., and Lessley, B. V., 1989. Indian town best management pratices demonstration farm: Summary of hydrologic and water quality monitoring 1986-1988. Unpublished Report to the Maryland Department of Agriculture, Agricultural Engimeering Department, University of Maryland, Maryland
  10. 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
  11. Shin, Y. C., Choi, J. D., Lim, K. J., Shim, H. H., Lyou, C. W., Yang, J. E., and Yoo, K. Y., 2005. Pollutant load characteristics from a small mountainous agricultural watershed in the North Han river basin. J Korean Society of Agricultural Eng. 47(6), pp. 83-92 https://doi.org/10.5389/KSAE.2005.47.6.083
  12. Yaksich, S. M., and Verhoff, F. H., 1983. Sampling strategy for river pollutant transport. J Environ. Eng. 109, pp. 219-231 https://doi.org/10.1061/(ASCE)0733-9372(1983)109:1(219)