Underground water monitoring device for preventing underground water cross contamination and monitoring method thereof

Abstract

The invention relates to the technical field of hydrogeological survey, and is to provide an underground water monitoring device and method for preventing underground water cross contamination. The device comprises a monitoring pipe and a water seepage port. The monitoring pipe comprises a water taking part and a water stop part; cavities are formed in the water taking part at intervals along theheight direction of the monitoring pipe; the water stop part is annular and wraps and is fixed to the side face of the water taking part; horizontal screw rods are rotationally connected to the positions, corresponding to the upper ends of the cavities, of the two sides of the water taking part; each screw rod is in threaded connection with a stop block, and the screw rod and the stop block are located in the water stop part; outlets allowing the stop blocks to penetrate out are formed in the positions, right opposite to the stop blocks, of the side face of the water stop part; and before monitoring, the monitoring pipe is located in the drill hole, and when the stop block slides to the end, away from the water taking part, of the corresponding screw rod, the stop block is exposed out of the outlet and extrudes the drill hole. The method has the advantages that cross contamination of underground water is reduced, and meanwhile, stratified water pumping and sampling are conducted on theaquifers of different depth sections in the drilled holes with the same hole diameter.

Description

technical field [0001] The invention relates to the technical field of hydrogeological survey and survey, in particular to a groundwater monitoring device and a monitoring method for preventing cross-contamination of groundwater. Background technique [0002] At present, the rapid development of industry has brought groundwater pollution. The monitoring of pollutants in groundwater is an important work in the field of environmental monitoring, and it also provides guidance for site risk assessment and soil remediation. [0003] The existing groundwater monitoring generally adopts the method of layered pumping and sampling test. In the same borehole, different depths of aquifers are constructed into boreholes with different diameters, and water-stopping treatment is carried out in steps by using water-stopping pipes. [0004] In the process of borehole drilling and sampling, the upper pollution often moves down to the depth of the borehole along with the circulating medium d...

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Problems solved by technology

[0004] In the process of borehole drilling and sampling, the upper pollution often moves down to the depth of the borehole along with the circulating medium drilled in the borehole and the annular gap channel of the borehole, polluting other uncontaminated formations or hole sections, Cross-contamination of groundwater has been caused, leading to an increase in the scope of pollution, deepening of pollution depth, and increase in pollution degree, which adds great difficulty to investigation, assessment, monitoring, treatment and restoration

[0005] Groundwater cross-contamination also directly leads to a decrease in the accuracy of groundwater pollution investigations, making it impossible to accurately assess water and soil pollution sources, pollution channels, pollution characteristics, pollution degrees, and pollution scopes.

At the same time, groundwater cross-contamination adds too much uncertainty to the subsequent pollution repair and treatment, resulting in reduced repair efficiency, prolonged repair time, increased repair costs, and even difficulty in effectively carrying out repair work

[0006] The above-mentioned existing technical solutions have the following defects: cross-contamination is prone to occur during the drilling and sampling process of groundwater, resulting in deterioration of the pollution situation, and at the same time, it increases the difficulty of investigation, evaluation, monitoring, treatment and restoration

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