JP3210105B2 - Measuring device for groundwater flow - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groundwater flow measuring device which is buried in a borehole such as a borehole and measures the flow direction, flow velocity, and water quality of groundwater.

[0002]

2. Description of the Related Art Recently, in the fields of groundwater preservation, environmental pollution impact investigation, groundwater treatment measures in construction work, etc., it has become necessary to accurately grasp the state of groundwater, and various groundwater flow measuring devices have been developed. It has been proposed. For example, a groundwater sensor installed in a borehole is provided with a groundwater circulation section through which groundwater flows from the surroundings, and a special electrode and a large number of electrodes are arranged with a distilled water injection mechanism connected to the groundwater circulation section, A groundwater flow measuring device that injects a fixed amount of distilled water into the flowing groundwater in the groundwater flowing section at the same pressure, detects the potential difference between the electrodes, and measures the flowing direction and flow velocity of the groundwater (Japanese Patent Laid-Open No. 62-147342). Official Gazette) and a transparent plate and an observation part formed by a collar surrounding the periphery and protruding downward are installed in the borehole, and the observation part is filled with pressurized gas and the bottom surface is filled with groundwater. Forming, discharging tracer such as plastic particles on the water surface, observing the moving state of the tracer with a TV camera placed above the observation section, measuring the direction of flow of groundwater, and measuring the flow of groundwater Location (JP 63-106589 JP) have been proposed have been developed.

[0003]

In the conventional apparatus for measuring the flow of groundwater, distilled water is injected into the groundwater flowing through the groundwater flow section provided in the groundwater sensor as described above, and disposed in the groundwater flow section. The measurement mechanism that detects the potential difference between the electrodes requires a complicated injection mechanism that injects a certain amount of distilled water into the flowing groundwater at the same pressure, and the measurement requires skill and the potential difference between the electrodes is detected. The measurement accuracy and reliability of the system have their own limits, and there is a problem that the groundwater flow cannot be observed visually.

A measuring mechanism that fills the observing section with a pressurized gas to form a groundwater surface at the lower end thereof and observes the movement of the tracer discharged to the water surface with a television camera is to visually check the groundwater flow. Although observable, the formation of the water surface of groundwater by pressurized gas, the arrangement of the tracer in the water surface, etc. require troublesome operation and skill, and the movement of the tracer varies significantly depending on the soil condition of the water surface. There are issues such as limitations on measurement accuracy and reliability.

The present invention has been developed in order to solve the above-mentioned problems, and the object thereof is to inject a coloring agent into the flowing groundwater in the groundwater flowing section, and to distribute the flowing groundwater using an optical fiber. Providing a groundwater flow measurement device that improves measurement performance and reliability of groundwater flow by simplifying the mechanism and reduces costs by transmitting measurement light in the direction of the azimuth, image processing by the light-receiving image processing device, and cleaning the groundwater circulation unit. To be.

[0006]

SUMMARY OF THE INVENTION The present invention provides a groundwater sensor buried in a borehole provided with a groundwater circulation section through which groundwater flows from the surroundings, and a coloring agent injection mechanism for coloring the flowing groundwater at the center of the groundwater circulation section. A light source for measurement is provided in the groundwater circulation section, and a large number of water detection optical fibers that transmit colored groundwater and light / dark measurement light are continuously installed in the entire area to distribute each water detection optical fiber. By connecting to the groundwater light receiving image processing device, the coloring groundwater is colored by its colorant injection mechanism, the measuring light (coloring and light / dark) of the flowing groundwater in the groundwater flowing part is transmitted by the optical fiber for each water detection, and the light receiving image The image processing by the processing unit enables visual observation and observation of the flowing groundwater, thereby improving the measurement performance and reliability of the groundwater flow.

[0007] Further, an orientation detector is provided in the groundwater sensor, a measurement light source is provided in the orientation detector, and a plurality of orientation detection optical fibers for transmitting measurement light in the orientation are connected in series.
By connecting each direction detecting optical fiber to the light receiving image processing device, the measurement light (direction) of the groundwater sensor is transmitted by each direction detecting optical fiber and the ground light sensor is processed by the image processing by the light receiving image processing device. Visualization and observation of the azimuth are possible, and the measurement accuracy of the flowing direction of the flowing groundwater is further improved. In addition, by connecting the washing water supply mechanism to the groundwater circulation section, it is possible to wash the groundwater circulation section at any time, and further improve the measurement accuracy,
The measurement efficiency and performance are further enhanced by facilitating repeated measurement.

[0008]

[Function] A groundwater sensor is buried in a borehole, groundwater is circulated from the surroundings to the groundwater circulation part of the groundwater sensor, and a colorant is injected into the central part of the groundwater circulation part by a colorant injection mechanism, thereby detecting a large amount of water. The measuring fiber of distribution groundwater and light / dark measurement light are transmitted from the whole area of the groundwater circulation part by the optical fiber, and each measurement light is image-processed and imaged as coloration and light / dark light data of distribution groundwater by the light receiving image processing device. The flow direction, flow velocity, water quality, etc. of the flowing groundwater can be visually observed with the video, and excellent measurement performance and reliability of the groundwater flow can be obtained.

Also, a plurality of azimuth detecting optical fibers transmit azimuth measurement light of an azimuth detector provided in the groundwater sensor, and each of the measurement lights is subjected to image processing as light data of the azimuth of the groundwater sensor by a light receiving image processing device. The orientation of the groundwater sensor, that is, the flow direction of the flowing groundwater, is further improved in measurement accuracy. Further, the groundwater circulation section can be washed at any time by the washing water supply mechanism, and the measurement accuracy can be further improved, and the measurement efficiency and performance can be further improved by performing repeated measurement and long-term measurement.

[0010]

1 and 2 show an embodiment of a groundwater flow measuring apparatus according to the present invention, and FIG. 3 shows an embodiment of a groundwater flow measuring method using the same. In the figure, 1 is a groundwater sensor buried in a well 31 such as a borehole, 2 is a groundwater circulation section provided in the groundwater sensor, and 6 and 7 are a colorant injection pipe 6 and a colorant supply section 7 on the ground side. A colorant injection mechanism, 8 is a light source for measurement of the groundwater flow section 2, 9 is a water detection optical fiber connected to the whole area of the groundwater flow section, 10 is a direction detector (direction magnet) disposed in the groundwater sensor, 11 Is a measuring light source of the azimuth detector 10, 12 is an azimuth detecting optical fiber provided in the azimuth detector 10, 13 and 14 are cleaning water supply mechanisms including a cleaning water injection pipe 13 and a ground-side cleaning water supply unit 14, 15 and 16 are the codes of the measurement light sources 8 and 11, 1
7 is a ground-side power supply connected to cords 15 and 16;
Is a light receiving image processing apparatus on the ground side connected to each of the optical fibers 9 for detecting water and the optical fibers 12 for detecting azimuth;
In the illustrated embodiment, a groundwater sensor 1 buried in a borehole 31 is provided with a groundwater circulation unit 2 through which groundwater flows from the surroundings, and a coloring agent injection mechanism 6 for coloring the distribution groundwater in the center of the groundwater circulation unit 2. 7, a light source 8 for measurement is provided in the underground water circulation section 2, and a number of water detection optical fibers 9 for transmitting measurement light for coloring and light and dark of the distribution groundwater are continuously provided in the whole area. Optical fiber 9 is used for light receiving image processing device 1
8 is connected to a groundwater flow measuring device.

[0011] In the groundwater flow measuring device,
The groundwater sensor 1 is provided with an azimuth detector 10, the azimuth detector 10 is provided with a measurement light source 11, and a plurality of azimuth detection optical fibers 12 for transmitting azimuth measurement light are connected in series,
The azimuth detecting optical fiber 12 is connected to a light receiving image processing device 18 to form a groundwater flow measuring device. Furthermore, in the underground water flow measuring device, the underground water flow measuring device in which the washing water supply mechanisms 13 and 14 are connected to the underground water circulation unit 2 is provided.

More specifically, the groundwater sensor 1 comprises:
The groundwater sensor 2 is formed of plastic or stainless steel so as not to impair the function of the direction detector (direction magnet) 10 disposed therein. , A space filling material (glass ball, gravel, etc.) 4 is filled, and a mesh mesh 5 is provided around the spacer, so that groundwater can freely flow from the entire circumference. In addition, a mechanism for freely flowing in each direction is provided. The colorant injection mechanism 6,
Reference numeral 7 denotes a colorant injection pipe 6 with an electromagnetic on-off valve (not shown) and a colorant injection section 7 on the ground side, which are connected to the central portion on the upper surface side of the groundwater flow section 2 and controls opening and closing of the electromagnetic on-off valve. A predetermined amount of a colorant (for example, ink) is injected into the central part of the groundwater circulation part 2 by the pump function of the colorant injection part 7 and mixed into the groundwater flowing therethrough. Further, a large number of measurement light sources 8 arranged on the lower surface side of the groundwater circulation unit 2 emit light (for example, red light) over the entire area of the circulation groundwater in the groundwater circulation unit 2, and the upper surface side of the groundwater circulation unit 2. A large number of optical fibers 9 for water detection are connected to each other and serve as a mechanism for transmitting the measurement light of the coloring and lightness / darkness of the whole groundwater flowing in the groundwater flowing part 2.

The azimuth detector 10 is preferably constructed by arranging an azimuth magnet or the like as shown in the groundwater sensor 1, and a plurality of measurement light sources 11 are arranged below the azimuth detector 10. A plurality of azimuth detecting optical fibers 12 are connected to each other above the azimuth detecting optical fibers 1.
2 transmits the measurement light of the direction of the groundwater sensor 1. The washing water supply mechanisms 13 and 14 are composed of a washing water injection pipe 13 with a plurality of electromagnetic opening / closing valves (not shown) and a washing water supply unit 14 on the ground side, which are connected to the upper surface of the groundwater circulation unit 2. A predetermined amount of washing water is injected into the groundwater circulation unit 2 by remote control of the on-off valve and the pump function of the washing water supply unit 7 to wash the interior as needed, thereby enabling repeated measurement.

Further, a light receiving image processing device 18 is connected to each of the optical fibers 9 for detecting water and each of the optical fibers 12 for detecting azimuth, and is used for coloring and transmitting underground water transmitted by the optical fibers 9 and 12. Receiving each measurement light of dark and light and each measurement light of the azimuth of the groundwater sensor 1, digitizing the change of each measurement light, calculating and processing the image, the azimuth image 20 of the groundwater sensor 1 as shown in FIG. Of the measurement images 21a, 21b, and 21c of the colored and light and dark areas, and the flow direction, the flow velocity, and the water quality of the groundwater in the groundwater flow section 2, that is, the groundwater in the stratum are calculated by the calculation. It has a mechanism (display, recorder) that also has the function of a recorder that records data.

The underground water flow measuring device is used, for example, by burying it in a bowling hole 31 excavated by a boring machine 30 as shown in FIG. That is, FIG.
As shown in (B), the groundwater sensor 1 is placed in the bowling hole 31.
And place the groundwater flow section 2 in the portion of the stratum G to be measured, and place a filter (sand or gravel, etc., not shown) or a packer (rubber seal, air packer, etc.) around the groundwater sensor 1 as necessary. 3), the casing pipe 32 of the borehole 31 is pulled out and removed as shown in FIG. 3 (C), and the groundwater sensor 1 is buried, and as shown in FIG. The coloring agent supply unit 7 is connected, the power supply 17 is connected to the cords 15 and 16, the washing water supply unit 14 is connected to each washing water supply pipe 13, and further, each water detection optical fiber 9 and each direction detection optical fiber 12 are connected. The light receiving image processing apparatus 18 is connected to the apparatus, and the groundwater in the formation G is set as shown in FIG.

When set as shown in FIG. 1 (A), first, washing water is injected into the groundwater flow section 2 through the washing water supply section 14 and the plurality of washing water injection pipes 13 to perform washing, and an initial measurement is attempted. After that, the flow of the groundwater flowing through the groundwater flow section 2 is left for a suitable period of time until there is no disturbance, and the flow is normalized, and then the light sources 8 and 11 for measurement are turned on by the power supply 17 and the cords 15 and 16 (for example, red). And the like, and emits light to the distribution groundwater in the groundwater distribution unit 2 and the direction detector 10, and at the same time, a predetermined amount of colorant is supplied into the central part of the groundwater distribution unit 2 by the colorant supply unit 7 and the colorant injection pipe 6. inject. As the colorant, ink that mixes with the groundwater without settling, appropriately blocks the above-mentioned light emission, and easily changes color or darkness of the passing light, etc. is preferably used, and water quality can be detected as necessary. Various coloring chemicals are applied.

A large number of water detecting optical fibers 9 connected to the groundwater circulation unit 2 transmit the measurement light of the coloring and light / dark from the entire area of the groundwater flowing in the groundwater circulation unit 2. The plurality of azimuth detecting optical fibers 12 connected to the azimuth detector 10 transmit measurement light of the azimuth of the azimuth detector provided in the groundwater sensor, and the light reception image processing device 18
Each measurement light is input, the change of each measurement light is digitized, calculated and image-processed, and the azimuth image 20 of the groundwater sensor 1 as shown in FIG. In addition to displaying the images as the measurement images 21a, 21b, and 21c, the flow direction and flow velocity of the groundwater flowing in the groundwater flowing unit 2, that is, the groundwater in the stratum G, and the water quality are calculated and recorded. Each measurement image 21a, 21b, 21c
In the case where there is no influence of the colorant, the light source color of the measurement light source 8, that is, a red image is obtained, and the measurement images 21 a, 21 b, and 21 are formed on the downstream side of the distribution groundwater due to the mixing of the colorant.
In the order of c, light and dark image changes are caused, and while visually observing the image of the light receiving image processing device 18, the direction of the image change and the flow direction of the flowing groundwater in the groundwater flowing unit 2 are determined by the measurement. The flow velocity can be accurately grasped, and the quality of the water can be inspected by selecting the colorant and changing its color.

When the above measurement is completed, the inside of the underground water circulation unit 2 is washed by pouring washing water as required, and the measurement is repeated after the underground water in the underground water circulation unit 2 is stabilized, and the groundwater sensor 1 is raised. Then, the measurement can be repeated on the next formation layer, and the measurement can be repeated again, so that excellent measurement performance and reliability can be obtained.

In the above measurement, when the geological layer to be measured is shallow, the direction of the groundwater sensor 1 can be determined and buried on the ground, and the measurement of the direction is unnecessary. In addition, by installing a washing mechanism, it is possible to measure regularly over a long period with the groundwater sensor buried.

[0020]

According to the present invention, a groundwater sensor is buried in a wellbore constructed as described above, and groundwater is circulated from the surroundings to a groundwater circulating section provided in the groundwater sensor. When the colorant is injected into the central part of the groundwater, a large number of optical fibers for water detection transmit colored groundwater and light / dark measurement light from the whole area of the groundwater circulation section. The image data is processed as light and dark light data, and the flow direction, flow velocity, and water quality of the flowing groundwater can be visually observed to greatly improve the groundwater measurement performance and reliability.

Also, measurement light of the direction of the direction detector provided in the groundwater sensor is transmitted by a large number of direction detection optical fibers, and each measurement light is imaged as light data of the direction of the groundwater sensor by the light receiving image processing device. The accuracy of measurement of the direction of the groundwater sensor, that is, the flow direction of flowing groundwater, has been further improved. Further, the inside of the groundwater circulation unit is washed at any time by the washing water supply mechanism, so that the measurement accuracy is further improved, and the measurement efficiency and performance are further improved by enabling repeated measurement and long-term measurement.

Further, the device of the present invention has such features that the mechanism is remarkably simplified, compact, and provided at low cost.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing an embodiment of the present invention (A).
(B)

FIG. 2 is an image front view of the light receiving image processing apparatus.

FIG. 3 is a side view mechanism diagram (A) to (D) of each step showing a method of measuring a groundwater flow.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 groundwater sensor 2 groundwater circulation unit 6, 7 colorant injection mechanism 8, 11 light source for measurement 9 optical fiber for water detection 10 azimuth detector 12 optical fiber for azimuth detection 12 13, 14 washing water supply mechanism 18 light receiving image processing device 31 Well

Claims (3)

(57) [Claims] An underground water sensor buried in a borehole is provided with a groundwater circulation section through which groundwater flows from the surroundings, and a coloring agent injection mechanism for coloring the flowing groundwater is provided at the center of the groundwater circulation section so as to be connected to the groundwater circulation section. A light source for measurement is provided in the section, and a large number of water detection optical fibers that transmit colored groundwater and light / dark measurement light are connected to the whole area, and each water detection optical fiber is connected to the light receiving image processing device. Characteristic groundwater flow measuring device. 2. The groundwater flow measuring device according to claim 1, wherein the groundwater sensor is provided with an azimuth detector, the azimuth detector is provided with a measuring light source, and a plurality of azimuth detecting lights for transmitting azimuth measuring light. An underground water flow measuring device, comprising a plurality of fibers connected to each other, and each direction detecting optical fiber connected to a light receiving image processing device. 3. The underground water flow measuring device according to claim 1, wherein a washing water supply mechanism is connected to the underground water flowing part.