Leak detection method of coastal intake and drainage facilities based on radon isotope

Abstract

The radon isotope-based leak detection method for coastal intake and drainage sluice facilities provided by the present invention has the following steps: according to the shape of the freshwater water area near the inside of the sluice, evenly divide the grid of measuring points; collect water samples, and collect the same The radon activity of the water sample is measured in real time, the radon activity distribution map of the inlet and outlet sluices is drawn, the grid of the radon activity variation area is selected, and the water samples are collected vertically at a certain depth interval at the actual coordinates. At the same time, the seawater outside the sluice and the groundwater near the inflow and drainage sluice were collected for comparison of radon activity, so as to comprehensively identify the three-dimensional coordinates of the leakage point and the leakage path. The technical principle of this detection method has a complete physical mechanism, and the operation route is clear and clear. The detection step uses the high-resolution grid to synthesize multi-source information to identify the three-dimensional coordinates of the leakage point and the leakage path; it can quantitatively distinguish the seawater at the leakage point Intrusion and groundwater leakage, the detection process is simple and fast, achieving the effect of non-destructive testing.

Description

technical field [0001] The invention belongs to the field of leakage detection of water conservancy projects, in particular to a method for detecting leakage of coastal intake and drainage sluice facilities based on radon isotopes. Background technique [0002] The reclamation and development of coastal tidal flat land is an important part of comprehensive land improvement. New reclamation areas are often threatened by seawater intrusion, resulting in soil salinization and reduction in the area of ​​farmland in reclamation areas. To prevent seawater intrusion into new reclamation areas, the widespread leakage of intake and drainage facilities must be solved. At present, there are few studies on the leakage detection of sluices in coastal reclamation areas, and it is difficult to distinguish the amount and path of seawater intrusion and groundwater leakage, which greatly hinders the development of related engineering or non-engineering restoration measures. Traditional metho...

AI Technical Summary

Problems solved by technology

Resistivity method and radar geophysical method detect the surface and internal defects of hydraulic structures to determine the location of the leakage, but this detection method generally needs to drain the reservoir water, which requires a huge workload and large detection errors; The pseudo-random flow field method uses the current density field to fit the abnormal flow velocity field distribution caused by piping leakage, the detection depth is limited, and the results are uncertain

Images