利用抽水资料确定含水层参数的二分法

为了方便准确地利用非稳定流抽水资料确定含水层参数,根据目标函数最优值存在的条件,将最优化问题转化为一个一元非线性方程的求解问题.采用常用、简单、容易实现的二分法求其根,进而由求解结果求出含水层的水文地质参数.该方法克服了各种传统优化方法原理抽象、步骤繁杂及数值计算量大的缺点.最后通过实例分析发现,用该方法计算得到的水文地质参数与实测值十分接近.

Bisection method for determining the hydrogeology parameters of aquifer by means of the unsteady flow pumping data

In order to easily and accurately determine the hydrogeology parameters of aquifer by means of unsteady flow pumping data,according to the existing conditions of the optimal value of an objective function,an optimization problem is transformed into a problem of solving a one-variable nonlinear equation.The equation is solved using the most common and easiest bisection method,and then the parameters of aquifer will be obtained according the solution.This method of solving the hydrogeology parameters of aquifer overcomes the disadvantages of the traditional optimization methods,such as the abstract principle,the complex steps and great computation amount.Finally,the calculation and analysis of an example shows that all the hydrogeologic parameters calculated using this method are very close to measured values.