貯留モデルによる不圧の地下水の涵養と流出の構造解析

概要

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The results obtained through the further study on the subject are described hereunder. 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(0)e^<-(α/λ)/t> (7). A slope of depletion part of semilogarithmic time-series plot of ground water head, A, is defined to be A=α/λ (8). Thus the real depletion coefficient, α,can be known when the specific yield, λ, becomes clear. 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). When the α and λ are properly defined a recharge other than from rainfall may be evaluated. Some of representative models under various hydrographs made for a verification purpose of a model is given in Fig. 4. Excluding major exceptions, the α and λ concentrate an order of n×10^< -4> day^<-1> and several percents respectively. 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.
一般社団法人日本応用地質学会の論文
1982-03-30