| Abstract |
| According to the analysis on previous studies of numerical modeling and evaluation of ground water effects, most of them focused on mediating variables, rather than a grid size. The first setting for modeling is a proper grid size of an area to analyze. Therefore, this study used the three-dimensional numerical analysis model MODFLOW to vary a grid size, to estimate an observation level and a calculation level, and to compare the characteristics of ground water. As a result, when the optimal mediating variable with the grid size of 50m×50m was estimated for the initial mediating variable, Mean error was 0.159, Mean absolute error 1.072, Root mean squared error 1.489. Therefore, the target area had applicability of numerical model. In the condition where the optimal mediating variable was fixed and a grid size varied, the model was applied. As a result, just as the value of observation level, the value of determination coefficient was 0.999. It indicated that mediating variable was more sensitive to ground water modeling than a grid size. Nevertheless, in the case of modeling for wells density area or for precision, each grid size was analyzed to be determined according to well in order for more accurate analysis. Therefore, it was found that it was necessary to set a proper grid size and assign each grid size to each well in order to increase accuracy of modeling. |
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| Key Words |
| MODFLOW, Groundwater, Groundwater Level, 3D Modeling, Grid size |
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