Linear And Nonlinear Two Flow Analytical Solution Of The Unsteady Well Flow On The Coexistence Of Regional Research

This thesis is divided into five chapters:(1) Introduction.(2) The analytical solution of two-regime about unsteady well flow on two kinds of common hydraulic laws.(3) Further more researchs on the problems of two-regime about unsteady well flow.(4) The type curves of two-regime about unsteady well flow and the simplifications of the well functions.(5) Conclusions .In the first chapter,the history and present situations, the new results and the existing questions of researchs on unsteady well flow problems are introducted. Further more , the questions to be researched in this thesis are outlined.In the second chapter, the specific discharges ,the drawdowns and the well functions are derived on two-regime well flow problems about two kinds of common seepage laws.In order to research the two-regime well flow problems more accurately, in the third chapter, the analytical solutions have been derived in the situations as follows: ① the nonlinear exponent has been discussed in details according to the separations of nonlinear domain.② the nonlinear exponent is a function of the radial distance from the pumping well. ③ the two-regime well flow problems being in the steady state.In the fourth chapter, the problems of two-regime well flow have been discussed concentrating on a kind of special seepage law. The type curves are caculated and graphed. The well functions are simplified and the values of well functions in common use are caculated. As an example, the aquifer parameters are determined according to the type curve method.In the fifth chapter, reviewing all the works in the thesis, some conclusions are given.