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단계양수시험 해석시 우물상수 산정 방법이 우물효율에 미치는 영향
정상용 ( Sang Yong Chung ),김병우 ( Byung Woo Kim ),김규범 ( Gyoo Bum Kim ),권해우 ( Hae Woo Kweon ) 대한지질공학회 2009 지질공학 Vol.19 No.1
Step-drawdown tests were conducted at four pumping Wells, two in porous media and two in fractured rocks, respectively. In general, P = 2.0 suggested by Jacob (1947) is applied to porous media and fractured rocks in terms of drawdowns of step-drawdown test. In an attempt to review problems of linear model (Jacob`s graphic method) in interpreting the step-draw down test, the outcomes of well parameters (aquifer loss coefficient (B), well loss coefficient (C) and well loss exponent (P)) calculated from linear and nonlinear model (Labadie and Helweg`s leastsquares method) were compared and analyzed. The values of C and P calculated from linear and nonlinear models differed according to permeability of aquifer and the conditions of pumping well. The value C obtained from nonlinear models in porous media and fractured rocks is about 100~10-2 and 10-3~10-6 times lower than in their linear models, respectively. The value P of porous media obtained from nonlinear model ranged from 2.123 to 2.775, while it ranged from 3.459 to 5.635 for fractured rocks. In case of nonlinear model, well loss highly depends on the value P. At this time, well efficiencies calculated from linear and nonlinear models were 1.56~14.89% for porous media and 8.73~24.71% for fractured rocks, showing a significant error according to chosen models. In nonlinear model, it was found that the regression analysis using the least squares method was very useful to interpret stepdrawdown test in all aquifer.
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