Method for positioning constructed wetland blocked region through composite profiling apparent resistivity curves

The invention discloses a method for positioning a constructed wetland blocked region through composite profiling apparent resistivity curves. A composite profiling apparent resistivity measuring device is arranged on a constructed wetland and performs measuring point by point in an apparent resistivity profiling mode, a power supply positive electrode A, a power supply positive electrode B, a measuring electrode M and a measuring electrode N of the measuring device are arranged symmetrical about a measuring point O, measuring is performed between A and O by the selection of two electrode distances, and an 'infinitely distant' electrode C is arranged perpendicular to the measuring line. A measured apparent resistivity pAS and a measured apparent resistivity pBS which are obtained according to AO=H/3 and AO=H are used for drawing the composite profiling apparent resistivity curves in a full line and an imagery line respectively. If the measuring line is blocked, the composite profiling apparent resistivity curves will have the characteristic of a high-resistance negative intersection point, and the transverse position of the blocked region can be determined according to the position of the high-resistance negative intersection point; according to the characteristics of the apparent resistivity curves of the two electrode distances, the longitudinal distribution position of the blocked region is roughly judged, and namely the spatial distribution of the blocked region on the measuring line is determined.