Method for measuring deep groundwater flow rate

Abstract

The invention discloses a method for measuring deep groundwater flow rate. A hole is drilled in a measuring area, and if water appears in the borehole, drilling is stopped. A measuring device is placed into the borehole from the center of a casing through a measuring tube step-by-step. A collecting device is turned on. The falling position of the measuring tube is observed through a visual camera.When water flow is found, falling is stopped. A rotary centralizer is arranged at the top of the ground to keep the measuring tube in the vertical direction. The direction of the water flow is observed through the visual camera. If the water flow direction is parallel to the measuring device, the measuring tube is rotated, and the value of the flow rate is observed and collected. The steady maximum is the flow direction of the water flow. The upper end of the measuring tube is fixedly on the upper port of the casing through hard connection. The measured water flow is monitored in real time. Due to the convenience of the Dopod principle, a measuring element protruding into an overflowing tube can measure the instantaneous flow rate and the average flow rate. The method provided by the invention can measure deep groundwater and can determine the specific direction of the water flow.

Description

Technical field [0001] The invention relates to the technical field of measuring deep underground fluid data, in particular to a method for measuring the velocity of deep underground water. Background technique [0002] Doppler flow meter has just emerged in our country, and it is not widely used to measure the flow direction of groundwater flow. Since there is no suitable borehole that can be applied to the probe device to measure the size and direction of the fluid using sound waves, its application Conditional judgment still needs to solve many technical problems. If these problems are solved, the Doppler velocity measurement instrument will have higher velocity measurement accuracy, larger velocity measurement range, and stronger anti-interference ability. [0003] Application number: 201610997859.3 discloses an intelligent underground water level measuring instrument, which includes a measuring device casing, connecting wires, a wire sealing cover, a water pressure sensor and ...

AI Technical Summary

Problems solved by technology

[0009] Static water level logging method, accuracy 0.01, non-recoverable, the main principle is Darcy's law, the operation of this method is cumbersome, and the accuracy is not high

Its own limitations are relatively large, and the requirements for geological structure, drilling equipment, and flow velocity are too high. At the same time, it faces negative effects such as low precision, large engineering workload, long measurement cycle, and damage to underground structures caused by the number of drilling wells.

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