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A Study on the Variation of Groundwater Level in the Han River Estuary (The Effect of the Removing of a Weir)  

Kim, Sang-Jun (Dept. of Civil and Environmental Engineering, Kyungwon University)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.20, no.6, 2008 , pp. 589-601 More about this Journal
Abstract
The variation of groundwater level near the Shingok weir has been analyzed. To consider the soil inhomogeneity, coefficient of effective permeability was computed to be 0.313 m/day in the horizontal direction, and 0.0423 m/day in vertical direction. Anisotropic ratio is 7.19. The river water level drawdown (caused by the removing of the weir) causes the groundwater level drawdown, and 3 months are required for the new steady condition. and groundwater flows from Han river toward Gulpo stream before the removing of the weir, but when the weir removed, the flow direction changes. The groundwater level falls maximum 30 cm in the areas under the influence of Han river, but, in the areas near Kulpo stream, groundwater level falls about 10 cm. The amount of groundwater use in the study area was investigated to be $52m^3/day$ and in this condition, groundwater level falls maximum 1m (before or after the removing of Shingok weir). therefore, the variation of groundwater level caused by the removing of Shingok weir is less than that caused by the usual use of groundwater.
Keywords
Han river estuary; Shingok weir; groundwater level drawdown; groundwater recharge; effective permeability; MODFLOW;
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