Browse > Article

A Sensitivity Analysis of Cell Size on a Distributed Non-Point Source Pollution Model  

Bae, In-Hee (Department of Environmental Science and Engineering, College of Engineering, Ewha Womans University)
Park, Jung-Eun (Department of Environmental Science and Engineering, College of Engineering, Ewha Womans University)
Park, Seok-Soon (Department of Environmental Science and Engineering, College of Engineering, Ewha Womans University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.9, 2005 , pp. 952-957 More about this Journal
Abstract
A sensitivity analysis study was performed to examine the effects of cell size on a distributed non-point source pollution model. The model, AnnAGNPS, whiff is a modified version of USDA's AGNPS, was applied to Eung stream watershed, a tributary of Cheongmi stream located in the South Branch of Han River System. The model components and results, such as channel length, slope, land use, and delivery ratio, were analyzed according to the various cell sizes from 10 to 200 ha. As cell sire increases, channel length decreases due to short-circuiting of meandering creek. The decreased channel length has more significant effects on the model results than any other geomorphological change. When the effects of land use and soil distribution are excluded, sediment delivery loads increase due to shorter time to reach the outlet of the watershed in larger tell size. When those effects are included, however, sediment delivery loads decrease in larger fell size because the variety of land use types can not be inputted. The predominant land use in the applied watershed is forest with very low soil erosion such that the predicted sediment delivery might be much lower than real system. The cell size of 30 ha was determined to produce the most appropriate resolution. Surface runoff and non-point source loads of TN, TP and BOD were predicted and the results agree well with the field measurements. From this study, it was shown that the model results would be very dependent on variations of topography, land use, and soil distribution, as a function of cell size, and the optimum cell size is very important for successful application of distributed non-point source pollution model.
Keywords
Cell Size; Sensitivity Analysis; AnnAGNPS; Distributed Model; Nonpoint Source Pollution;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Sensitivity to space and time resolution of a hydrological model using digital elevation data /
[ Bruneau, P.;Gascuel-Odoux, C.;Robin, P.;Merot, Ph.;Beven, K. ] / Hydrological Processes
2 AnnAGNPS Version 2: User Documentation /
[ Bingner, R.L.;Theurer, F.D ] /
3 Effect of cell size on AGNPS prediction, ASAE Paper No. 89-2662 /
[ Feezor, D.R.;Hirschi, M.C.;Lesikar, B.J. ] /
4 Nonpoint-pollution model sensitivity to grid-cell size /
[ Vieux, B.E.;Needham, S. ] / Journal of Water Resources Planning and Management
5 Effect of spatial variability on basin scale modeling /
[ Mamillapalli, S.;Srinivasan, R.;Arnold, J.G.;Engel, B.A. ] / Proceedings of Third International Conference/Workshop on Integrating GIS and Environmental Modeling
6 Impacts of input parameter spatial aggregation on an agricultural nonpoint pollution model /
[ FitzHugh, T.W.;Mackay, D.S. ] / Journal of Hydrology
7 The prediction of hillslope flow paths for distributed hydrological modeling using digital terrain models /
[ Quinn, P.;Beven, K.;Chevallier, P.;Planchon, O. ] / Hydrological Processes
8 Effects of digital elevation model map scale and data resolution on a topography-based watershed model /
[ Wolock, D.M.;Price, C.V. ] / Water Resources Research
9 Digital elevation model grid size, landscape representation, and hydrologic simulations /
[ Zhang, W.;Montgomery, D.R. ] / Water Resource Research
10 Nonpoint source pollution: a distributed water quality modeling approach /
[ Leon, L.F.;Soulis, E.D.;Kowen, N.;Farquhar, G.J. ] / Water Res.
11 확률론적 방법을 이용한 분포형 비점오염원 모델의 격자크기에 따른 매개변수 민감도 분석 /
[ 유금환;오경미;박희경 ] / 대한환경공학회 '99추계학술대회연구발표회 논문집(I)
12 수문해석을 위한 DEM에 의한 지형의 경사도분석에서 격자크기의 영향 /
[ 양인태;김연준 ] / 한국측지학회지
13 DEM aggregation and smoothing effects on surface runoff modeling /
[ Vieux, B.E. ] / Journal of Computing in Civil Engineering
14 Response of a distributed watershed erosion model to variations in input data aggregation levels /
[ Brown, D.G.;Bian, L.;Walsh, S.J. ] / Computers and Geosciences