Device and method for measuring flow velocity and flow direction and geological parameters of groundwater through cross holes of deep wells

A method for measuring a flow velocity and a flow direction and geological parameters of groundwater through cross holes of deep wells, comprises the following steps:

• step (1):
• measuring a correspondence between a conductivity and a concentration of a tracer solution at different temperatures in a laboratory;
• step (2):
• selecting boreholes, wherein the number of the boreholes is at least two;
• step (3):
• geologically cataloging lithology of the boreholes, and selecting a target aquifer section;
• step (4):
• selecting two target boreholes, placing detectors in the target aquifer section in the hole, and testing a conductivity background value and a temperature value;
• step (5):
• with respect to the two target boreholes in step (4), using one of the boreholes as a detection hole for placing the detectors, and using the other borehole as a hole for throwing the tracer source for placing a device for throwing the tracer source;
• using the device for throwing the tracer source to place the tracer solution in the hole for throwing the tracer source, and using the detectors to measure a water conductivity and temperature in the detection hole, to obtain a distribution curve of a tracer solution solubility with time;
• step (6):
• after the test is completed, interchanging the detection hole and the hole for throwing the tracer source, performing cross-test, and testing the conductivity background value once again before the test;
• and
• step (7):
• using the obtained distribution curve of the tracer solution solubility with time to calculate the seepage flow velocity and flow direction of groundwater in the hole.