Wide-range underground water flow velocity and direction testing device and method

Abstract

The invention belongs to the field of hydrogeological parameter testing, and specifically relates to a wide-range underground water flow velocity and direction testing device and method. The device comprises an underground water flow velocity measuring module based on the thermal disturbance technology; an underground water flow velocity measuring module based on a fluid mechanics model; and a boxbody which is used for fixing the underground water flow velocity measuring module based on the thermal disturbance technology and the underground water flow velocity measuring module based on the fluid mechanics model. The method comprises the steps: obtaining the data through the underground water flow velocity measuring module based on the thermal disturbance technology, measuring a flow velocity value Vs according to the obtained data, wherein the measurement range of the flow velocity value Vs is 10<-7> m / s< Vs <10<2> m / s; obtaining the data through the underground water flow velocity measuring module based on the fluid mechanics model, measuring a flow velocity value Vs according to the obtained data, wherein the measurement range of the flow velocity value Vs is 10<-2> m / s< Vs <10<2> m / s. The device and method can achieve the integrated testing of the wide-range underground water flow velocity and direction.

Description

technical field [0001] The invention belongs to the field of hydrogeological parameter testing, and in particular relates to a wide-range groundwater flow velocity and flow direction testing device and method. Background technique [0002] Groundwater seepage has a wide demand in many fields of hydrogeology, engineering geology, and environmental geology. Groundwater seepage is analogized to the constitutive equation of hydrogeological science, which is the focus of groundwater scientific research. Groundwater seepage is often the main cause of geological disasters in the field of engineering geology, such as landslides, debris flows, ground subsidence, and dam foundation piping leakage. Groundwater seepage causes soil solute migration and water-soluble pollutants to diffuse, and is also an influencing factor for soil and groundwater pollution remediation. As mentioned above, as the main characteristic parameters describing the groundwater seepage field, the real-time moni...

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Problems solved by technology

Its disadvantages are: 1. The compatibility with other monitoring methods is poor, and automatic data collection and secondary development cannot be carried out; 2. The physical meaning of the groundwater flow rate obtained through the statistical average of microscopic particles is not clear. Whether the cross-scale application is equivalent to the macroscopic The average velocity of groundwater is still debatable; 3. The scope of application is limited, suitable for harsh conditions of laminar flow, extremely slow groundwater velocity, and relatively stable groundwater flow direction

Simple structure, low cost, no pollution to the environment, and good for long-term operation, but the problem is: the flow rate test range is limited, not suitable for measuring the low flow rate of groundwater; secondly, in the traditional technical solution, the photosensitive element LED is used to measure the horizontal direction of the pendulum ball Displacement, the accuracy is poor, which limits the practical application of the method

Chinese patent CN105676308B is based on the improvement of the test method, using more than 3 pressure sensors to test the displacement and azimuth angle, which solves the problem of poor horizontal displacement test accuracy, but the problem that the test range is not suitable for low flow rate measurement is still not well resolved

Predecessors have developed and tried groundwater flow rate and flow monitoring devices based on different working principles, but they still cannot meet the actual engineering applications: the method based on ion velocity measurement- pollutes the underground environment, the system compatibility is general, and it has been rarely used

The second method based on micrographic determination is especially suitable for ultra-low flow rates, and the test range is suitable for 10 -5 m / s, but the system compatibility is poor, and the monitoring data is not conducive to the secondary development and integration; the third method based on the energy field disturbance test has a moderate test range and is suitable for 10 -7 ~10 -2 m / s, which basically satisfies the measurement of groundwater flow velocity under normal conditions, and uses temperature sensors, conductivity sensors, pressure sensors, etc. to test with high precision, good repeatability, and good system compatibility; the method based on the principles of mechanics and kinematics is suitable for flow velocity Larger cases (10 -2 ~10 2 m / s), suitable for groundwater bedrock fissure flow, karst cave pipeline flow, pressurized water jet flow, etc.

[0009] As mentioned above, there are two main defects in the existing groundwater flow rate and direction monitoring device: one is the limited test range, and the test methods with different working principles have segmental test range and limited scope of application; secondly, the monitoring system integration Long-term in-situ monitoring, automatic transmission, and secondary development and utilization of monitoring data are the focus of engineering requirements and the development direction of future monitoring technology, while the methods based on ion velocity measurement and photomicrography measurement have varying degrees of system integration defects , which is not conducive to remote automatic transmission and secondary development and utilization of monitoring data

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