ACCURATE CALCULATION OF SURFACE DISPLACEMENT INDUCED BY SINGLE WELL WITHDRAWAL OF NONSTEADY PERMEABLE FLOW OF GROUNDWATER IN RADIAL DIRECTION
Liu Dingwen and Lu Jiazhen (Institute of Seismology, State Seismological Bureau, Wuhan 430071) Song Wenyao and Zhang Ya (Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077)
With the help of Theis's theory on nonsteady flow of underground water, the analytic expressions of surface displacement induced by single well withdrawal of nonsteady radial radiant permeable flow on groundwater are derived, and the calculational scheme corresponding to these expressions is discussed. Then the calculation programmes of numerical integration using Hermite's integral formula with 20 nodal points are carried out. And some simulated calculation examples are given too. So the methods in this paper can be used in considering quantitatively the changes of crustal deformation induced by groundwater drainage while the high precise dynamic geodetic measurement is done in the area of underground nonsteady flow field.
【CateGory Index】： P542