A Structure Analysis of Runoff and Recharge of Unconfined Groundwater by the Storage Model

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  • 貯留モデルによる不圧の地下水のかん養と流出の構造解析
  • チョリュウ モデル ニヨル フアツ ノ チカスイ ノ カンヨウ ト リュウシュ

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Abstract

The results obtained through the further study on the subject are described hereunder.<BR>An unconfied aquifer model as shown in Fig. 1 has been clarified to be a depletion model of exponential function type as given by the following equation;h (t)=h(O)e-(α/λ)/t (7).<BR>A slope of depletion part of semilogarithmic time-series plot of groundwater head, A, is defined to beA=α/λ (8).<BR>Thus the real depletion coefficient, α, can be known when the specific yield, λ, becomes clear.<BR>The specific yield of a basin can be known through a proper pumping test. Otherwise an approximation may be made by an apparent depletion coefficient, A, and rainfall depth within a period. The manner of approximation are given in the equations (9) to (15).<BR>When the α and λ are properly defined a recharge other than from rainfall may be evaluated.<BR>Some of representative models under various hydrogeological conditions are illustrated in Fig. 3. One of time-series plots of observed and simulated hydrographs made for a verification purpose of a model is given in Fig. 4.<BR>Excluding major exceptions, the α and λ concentrate an order of n×10-4 day-1 and several percents respectively.<BR>Two kinds of recharge structure are described through the model adopted to a coral island that there are a slow structure for usual input and a rapid one for input in high intensity.

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