JPH10332522A - Detection system for water leak occurrence position - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the water leak occurrence position detection system which can precisely detect respective breakage places even if a water shield film is broken at those places. SOLUTION: One linear electrode on one side of the water shield film 10 is selected and connected to one side of an AC power source 11 and another linear electrode is selected on the other side, but other linear electrodes except the linear electrode on one side are all connected to the other side of the AC power source 11. Currents flows between the one linear electrode connected to one side of the AC power source 11 and all other linear electrodes, but a current detector 13 measures the current of only one linear electrode selected on the other side. Consequently, the current is measured while limited to nearby the intersection of the one linear electrode on one side connected to the one side of the AC power source 11 and the one linear electrode on the other side where the current measurement is taken.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a position where a water leak has occurred in a controlled final disposal site constructed by laying a waterproof film such as a synthetic resin or synthetic rubber sheet or asphalt.

[0002]

2. Description of the Related Art Conventionally, in an artificially controlled terminal treatment plant using a water impermeable film, the water impermeable film may be damaged such as cracks, and contaminated liquid in the disposal site may leak. If water leakage occurs, groundwater pollution and pollution problems will occur. Therefore, it is necessary to inspect the water barrier film periodically and, if the water barrier film is damaged, detect the water leak location and perform appropriate repairs.

[0003] In order to detect the location of such a water-impervious film leak, the following detection method is employed. In this detection method, a plurality of linear electrodes are laid in parallel at a predetermined interval below the water-impermeable film, and a plurality of linear electrodes are arranged above the water-impermeable film at a predetermined interval in a direction intersecting the lower electrode. An electrode arrangement in which electrodes are laid in parallel is used. In such an electrode arrangement configuration, one of the upper and lower linear electrodes is selected from the water impermeable film, and an AC power supply is applied between the upper and lower linear electrodes to detect a current flowing between the upper and lower linear electrodes. , Phase detection is performed using a signal synchronized with the phase of the applied voltage. Then, the position where the water leak has occurred is detected by comparing the output voltages of the phase detection circuits at the intersections of the upper and lower linear electrodes.

[0004] An example of the water leakage occurrence position detection method will be described below with reference to FIG. In this example, the linear electrodes A1 to A5 are arranged above the water shielding film 10 and the linear electrodes B1 to B5 are arranged below the water shielding film 81 in a direction crossing the linear electrodes A1 to A5, respectively. Have been. The output of the AC power supply 81 is power-amplified by the power amplifier circuit 82. The power-amplified output is passed through a current detection circuit 83, through a first electrode selector 84 that selects one of the upper linear electrodes A1 to A5, from among the upper linear electrodes A1 to A5 of the water barrier film 10. Of 1
Applied to the book. The selected one of the lower linear electrodes B <b> 1 to B <b> 5 is connected to the power amplifier circuit 82 via the second electrode selector 85.

According to such a configuration, a selected one of the upper linear electrodes A1 to A5 and the lower linear electrodes B1 to B5 are selected.
The selected one of the five is connected to an AC power supply 81 via a current detection circuit 83. The phase detection circuit 86 performs phase detection of the current detection circuit 83 with a phase synchronized with the applied voltage of the AC power supply 81. This phase detection output is supplied to the A / D converter 8
The digital signal is converted into a digital signal at 7 and supplied to a computer 88 such as a personal computer.

In such a configuration, if there is no breakage in the water barrier film 10, the current flowing between the linear electrodes selected above and below the water barrier film 10 becomes the current flowing through the capacitance component of the water barrier film 10. , The absolute value of the current becomes a small value, and becomes a leading phase with respect to the phase of the applied voltage of the AC power supply 81. On the other hand, when the water barrier film 10 is damaged, a current easily flows between the linear electrodes selected above and below the damaged portion.
From this, when the combined intersection of the upper and lower linear electrodes of the water-blocking film 10 is close to the damaged point, the absolute value of the current tends to increase and approach the phase of the applied voltage. From this, it is possible to detect a broken portion of the water barrier film 10 by measuring the current at each intersection of the upper and lower linear electrodes.

[0007] A phase detection circuit 86 is used for current measurement in the conventional detection method, and phase detection is performed on the output of the current detection circuit 83 at a phase synchronized with the applied voltage of the AC power supply 81, and the in-phase of the AC power supply 81 is detected. The components are extracted.

[0008]

However, in the above-described conventional water leakage occurrence position detection method, when a plurality of breaks occur in the water barrier film 10, the measurement result of the first break point is the second break point.
Affected by the damaged part. Further, the second damaged part is also affected by the first damaged part. Therefore, the water barrier film 1
In the case where a plurality of breaks occur in the zero, there is a disadvantage that the accuracy of specifying the broken portion is reduced.

In particular, if a square formed by two upper and lower adjacent linear electrodes is defined as one unit of measurement range, the adjacent measurement range may be damaged or the adjacent measurement range may be damaged. In this case, there is a disadvantage that accuracy is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a water leakage occurrence position detecting method capable of detecting each damaged portion with high accuracy even when a plurality of damages occur in the water barrier film.

[0011]

According to the present invention, in a controlled type final treatment plant constructed by laying a water-impervious film, a plurality of water-absorbent films are arranged at predetermined intervals in parallel above the water-impervious film. A linear electrode, a plurality of linear electrodes arranged at predetermined intervals so as to intersect the upper linear electrode in parallel with the lower side of the water blocking film, an AC power supply, and the upper plurality of lines. While selecting one of the linear electrodes, selecting one of the lower plurality of linear electrodes, connecting only one of the selected upper or lower linear electrodes to one of the AC power supplies, All the linear electrodes are selectively connected means for connecting to the other of the AC power supply, and a water impervious between a linear electrode connected to one of the AC power supply and one selected linear electrode on the opposite side. A current detection circuit for detecting a current flowing through the film, and receiving an output of the current detection circuit to perform detection. A plurality of linear electrodes on the upper side and the lower side of the impermeable film are sequentially selected, and when a combination of linear electrodes close to the water leakage occurrence position due to breakage of the impermeable film is formed, And a processing circuit for detecting a water leak occurrence position based on the output rising or falling below the value of another electrode combination.

[0012] According to the present invention, a plurality of linear electrodes arranged at predetermined intervals in parallel on the upper side of the water-impervious film in a managed type final treatment plant constructed by laying a water-impervious film; A plurality of linear electrodes arranged at a predetermined interval so as to intersect the upper linear electrodes in parallel with the lower side of the water-impervious film, an AC power supply, and a plurality of upper linear electrodes adjacent to each other; And selecting three adjacent ones of the lower plurality of linear electrodes, and selecting one of the selected upper three or lower three linear electrodes at the center of one side. Only one connecting means is connected to one side of the AC power source, and all other linear electrodes are connected to the other side of the AC power source.Selective connecting means, the center linear electrode connected to one side of the AC power source, and the other side are selected. Of the three linear electrodes that have flowed through the impermeable membrane between them and the central linear electrode. A current detection circuit for detecting,
A detecting means for receiving the output of the current detecting circuit to perform detection, sequentially selecting a plurality of linear electrodes on the upper and lower sides of the water-impervious film, and detecting a linear electrode close to a position where water leakage occurs due to breakage of the water-impervious film; And a processing circuit for detecting a water leak occurrence position because the output of the detection means rises or falls below the value of the other electrode combination when the combination of the water leak occurrence position is detected. Provided.

In any of the above inventions, the detection means may be realized by performing phase detection of the output of the current detection circuit with reference to the applied voltage of the AC power supply.

Further, the processing circuit receives the output of the current detection circuit and performs phase detection at the same phase as the applied voltage of the AC power supply, and receives the output of the current detection circuit. A second phase detection circuit that performs phase detection with a phase leading by 90 degrees from the applied voltage of the AC power supply, and dividing the output value of the first phase detection circuit by the output value of the second phase detection circuit. And a division circuit for performing the division, when the linear electrodes on the upper side and the lower side of the water-impervious film are sequentially selected and a combination of linear electrodes close to the position where water leakage occurs due to breakage of the water-impervious film, The leak occurrence position may be detected based on the output of the circuit rising or falling below the value of another linear electrode combination.

Further, the processing circuit receives the output of the current detection circuit and performs phase detection at the same phase as the applied voltage of the AC power supply, and receives the output of the current detection circuit. A second phase detection circuit that performs phase detection with a phase lead of 90 degrees from the applied voltage of the AC power supply, and a square that receives the output of the first phase detection circuit and squares the output of the first phase detection circuit Circuit, including a division circuit that divides the output value of the square circuit by the output value of the second phase detection circuit, sequentially selects the upper and lower linear electrodes of the impermeable film. When the combination of linear electrodes close to the position where a water leak occurs due to breakage of the water blocking film, the output of the division circuit rises or falls below the value of the other linear electrode combination, so that the position where a water leak occurs is detected. You may do it.

[0016]

In the above detection method, one of the linear electrodes on one side of the water-blocking film is selected and connected to one of the AC power supplies.
All other linear electrodes are configured to be connected to the other of the AC power supplies. As a result, a current flows between one linear electrode on one side connected to one of the AC power supplies and all the other linear electrodes, but the current measurement is selected on the opposite side via the water barrier film. This is a configuration performed only for one linear electrode. For this reason, unlike the detection method used in the conventional method, it was limited to the vicinity of the intersection of the linear electrode on one side connected to one side of the AC power supply and the linear electrode on the opposite side where the current measurement was performed. Since the current measurement is performed, it is possible to improve the accuracy of detecting breakage of the water barrier film.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of a water leakage occurrence position detecting method according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention. As in the prior art, the linear electrodes A1 to A5 are arranged above the water-blocking film 10, and the linear electrodes B1 to B5 are arranged below the water-blocking film 10 in a direction crossing the linear electrodes A1 to A5, respectively. Will be described.

In this embodiment, the first electrode selector 1
As 4, when one of the linear electrodes A <b> 1 to A <b> 5 (the linear electrode A <b> 3 in FIG. 1) is selected, an electrode selector having a function of connecting all the other linear electrodes in common is used. The same applies to the second electrode selector 15.

The output of the two-phase AC power supply 11 is
The power is amplified at 2. Between the two-phase AC power supply 11 and the upper linear electrodes A1 to A5 and the lower linear electrodes B1 to B5,
The first and second electrode selectors 14 and 15 are connected as follows. Referring also to FIG. 6, in the upper linear electrode, one linear electrode A3 selected by the first electrode selector 14 is connected to one of the AC power supplies, and the remaining linear electrodes A1 and A2 are connected. , A4, A5 are all connected to the other of the AC power supplies. In the lower linear electrode, one linear electrode B3 selected by the second electrode selector 15 is connected to the other of the AC power supplies via the current detection circuit 13, and the other linear electrodes B1, B2 , B4, B5 are all connected directly to the other of the AC power supplies.

As a result, a current flows between the upper linear electrode A3 and all the remaining linear electrodes. In the current detecting circuit 13, the upper linear electrode A3 and the lower linear electrode A3 are selected. Only the current flowing between B3 is detected.

Next, a processing circuit for processing the detection result of the current detection circuit 13 will be described. In the present embodiment, the processing circuits are the first and second phase detection circuits 16 and 17, the square circuit 1
8, a division circuit 19, an A / D converter 20, and a computer 21 such as a personal computer.

In the current measurement, the first phase detection circuit 16 performs first phase detection synchronized with the phase of the two-phase AC power supply 11, and the second phase detection circuit 17 detects the phase from the two-phase AC power supply 11. A second phase detection synchronized with the phase advanced by 90 degrees is performed. The division circuit 19 includes the first phase detection circuit 1
6, the output of the squaring circuit 18 for performing the square operation and the output of the second phase detection circuit 17
8 is divided by the output of the second phase detection circuit 17.
The calculation result of the division circuit 19 is converted into a digital signal by an A / D converter 20 and supplied to a computer 21. Note that such a processing circuit is disclosed in Japanese Patent Application No. Hei.
Since it is shown in No. 4, description of the operation principle is omitted.

If there is no breakage in the water barrier film 10, the water barrier film 10
Since the current flowing between the upper and lower linear electrodes becomes a current flowing through the capacitance component of the water barrier film 10, the absolute value of the current becomes a small value and advances with respect to the phase of the applied voltage of the two-phase AC power supply 11. Phase. On the other hand, when the water-blocking film 10 is damaged, the current easily flows in the damaged portion. Therefore, when the combined intersection of the upper and lower linear electrodes of the water-blocking film 10 is close to the damaged portion, the absolute value of the current is large. And the leading phase with respect to the phase of the applied voltage of the two-phase AC power supply 11 tends to approach the applied voltage. From this, the first and second phase detection circuits 1
6, 17 and the square circuit 18 and the division circuit 19, the current is measured at each of the intersections of the selected upper and lower linear electrodes. It is possible to accurately detect a damaged portion.

The method for selecting the linear electrodes is to reverse the linear electrodes above and below the water-blocking film 10, that is, the linear electrodes A in FIG.
Needless to say, the same measurement accuracy can be obtained even when the current 3 is detected by the current detection circuit 13.

FIG. 2 is a block diagram showing the configuration of the second embodiment of the present invention. 1 are denoted by the same reference numerals. Also in this embodiment, the linear electrodes A1 to A5 are provided above the water-blocking film 10, and the linear electrodes are provided below the water-blocking film 10. Linear electrodes B1 to B5 in directions intersecting A1 to A5
5 are arranged.

In this embodiment, the first electrode selector 2
As 4, three adjacent linear electrodes A <b> 1 to A <b> 5 (linear electrodes A <b> 2 to A <b> 4 in FIG. 2) are selected, and a central linear electrode among the selected three electrodes (FIG. The linear electrode A3) is selected, and the remaining linear electrodes A2 and A4 all use an electrode selector having a function of commonly connecting.
The same applies to the second electrode selector 25, which selects three adjacent electrodes (linear electrodes B2 to B4 in FIG. 2) and selects a central linear electrode (line in FIG. 2) among the three selected electrodes. The linear electrode B3) is selected, and the remaining linear electrodes B2 and B4 are all connected in common.

The output of the AC power supply 22 is power-amplified by a power amplifier circuit 23. AC power supply 22 and upper linear electrodes A1 to
The first and second electrode selectors 24 and 25 connect between A5 and the lower linear electrodes B1 to B5 as follows. In the upper linear electrode, one of the AC power supplies is connected to the central linear electrode A3 of the three selected by the first electrode selector 24, and the remaining linear electrodes A2 and A4 are all connected to the AC power supply. Connected to the other of In the lower linear electrode, the central linear electrode B3 of the three selected by the second electrode selector 25 is connected to the other of the AC power supply via the current detection circuit 13, and the remaining linear electrode Electrodes B2, B4
Are all connected directly to the other side of the AC power supply.

As a result, a current flows between the upper linear electrode A3 and the linear electrodes A2, A4, and B2, B3, B4. In the current detection circuit 23, the current flows between the upper linear electrode A3 and the lower side. Only the current flowing between the selected central linear electrode B3 is detected.

A processing circuit for processing the detection result of the current detection circuit 26 includes a detection circuit 27, an A / D converter 20, and a computer 21.

If there is no breakage in the water barrier film 10, the water barrier film 10
Since the current flowing between the upper and lower linear electrodes becomes a current flowing through the capacitance component of the water barrier film 10, the absolute value of the current becomes a small value, and the phase is advanced with respect to the phase of the applied voltage of the AC power supply 22. . On the other hand, if a break occurs in the water-blocking film 10, the current easily flows through the broken portion, so when the intersection of the upper and lower linear electrodes of the water-blocking film 10 is close to the broken portion, the absolute value of the current increases, In addition, the leading phase with respect to the phase of the applied voltage of the AC power supply 22 tends to approach the applied voltage. Thus, by measuring the current at each of the intersections of the upper and lower linear electrodes, it is possible to accurately detect the damaged portion of the water barrier film 10 from the output of the detection circuit 27 indicating the absolute value of the current. .

The processing circuit shown in FIG. 2 can be used as the processing circuit in the embodiment shown in FIG.

FIG. 3 is a block diagram showing the configuration of the third embodiment of the present invention. This embodiment is different from the second embodiment in the processing circuit in the phase detection circuit 28, and the following is all the same. Therefore, only the operation of the processing circuit will be described. In this embodiment, phase detection synchronized with the phase of the AC power supply 22 is performed by the phase detection circuit 28.

If there is no breakage in the water barrier film 10, the water barrier film 10
Since the current flowing between the upper and lower linear electrodes becomes a current flowing through the capacitance component of the water barrier film 10, the absolute value of the current becomes a small value, and the phase of the applied voltage of the Become. On the other hand, if a break occurs in the water-blocking film 10, the current easily flows through the broken portion, so when the intersection of the upper and lower linear electrodes of the water-blocking film 10 is close to the broken portion, the absolute value of the current increases, In addition, the leading phase with respect to the phase of the applied voltage of the AC power supply 22 tends to approach the applied voltage. As described above, by measuring the current at each intersection of the upper and lower linear electrodes using the phase detection circuit 28, it is possible to accurately detect the damaged portion of the water barrier film 10 from the current having the same phase component as the AC power supply 22. Becomes possible.

The processing circuit of FIG. 3 can also be used as the processing circuit in the embodiment of FIG.

FIG. 4 is a block diagram showing the configuration of the fourth embodiment of the present invention. This embodiment uses a main part of the processing circuit of the first embodiment instead of the processing circuit of the second embodiment. Therefore, FIGS. 1 and 2
The same parts as in FIG. The processing circuit according to the present embodiment includes first and second phase detection circuits 16 and 17, a division circuit 30, an A / D converter 20, and a computer 21.

In the processing circuit, the first phase detection circuit 16 performs first phase detection synchronized with the phase of the two-phase AC power supply 11, and the second phase detection circuit 17 calculates the phase of the two-phase AC power supply 90 by 90%. Second phase detection synchronized with the leading phase is performed. Receiving the output of the first phase detection circuit 16 and the output of the second phase detection circuit 17, the division circuit 29
Divides the output value of the first phase detection circuit 16 by the output value of the second phase detection circuit 17.

If there is no breakage in the water barrier film 10, the water barrier film 10
Since the current flowing between the upper and lower linear electrodes becomes a current flowing through the capacitance component of the water barrier film 10, the absolute value of the current becomes a small value and advances with respect to the phase of the applied voltage of the two-phase AC power supply 11. Phase. On the other hand, if a break occurs in the water-blocking film 10, the current easily flows through the broken portion, so when the intersection of the upper and lower linear electrodes of the water-blocking film 10 is close to the broken portion, the absolute value of the current increases, In addition, the leading phase with respect to the phase of the applied voltage of the two-phase AC power supply 11 tends to approach the applied voltage. For this reason, by using the first and second phase detection circuits 16 and 17 and the division circuit 29 and measuring the ratio of the current phase component at each intersection of the upper and lower linear electrodes,
It is possible to accurately detect a damaged portion of the water barrier film 10 from both the current value and the phase change.

This processing circuit can be used in place of the processing circuit in the first embodiment.

FIG. 5 is a block diagram showing the configuration of the fifth embodiment of the present invention. This embodiment uses the processing circuit of the first embodiment instead of the processing circuit of the second embodiment. Therefore, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.

In this processing circuit, as explained in FIG. 1, the two-phase AC power
The first phase detection synchronized with the first phase and the second phase detection synchronized with the phase advanced by 90 degrees from the phase of the two-phase AC power supply 11 by the second phase detection circuit 17 are performed. The division circuit 19 receives the output of the first phase detection circuit 16 and performs the square operation on the output of the square circuit 18 and the second phase detection circuit 17.
, The output value of the squaring circuit 18 is divided by the output value of the second phase detection circuit 17.

If there is no breakage in the water barrier film 10, the water barrier film 10
Since the current flowing between the upper and lower linear electrodes becomes a current flowing through the capacitance component of the water barrier film 10, the absolute value of the current becomes a small value and advances with respect to the phase of the applied voltage of the two-phase AC power supply 11. Phase. On the other hand, if a break occurs in the water-blocking film 10, the current easily flows through the broken portion, so when the intersection of the upper and lower linear electrodes of the water-blocking film 10 is close to the broken portion, the absolute value of the current increases, In addition, the leading phase with respect to the phase of the applied voltage of the two-phase AC power supply 11 tends to approach the applied voltage. Therefore, by measuring the current at each intersection of the upper and lower linear electrodes using the first and second phase detection circuits 16 and 17, the squaring circuit 18 and the division circuit 19, the current value and the phase change are measured. It is possible to accurately detect a damaged portion of the water barrier film 10 from both.

FIG. 6 is a diagram showing a current path common to the first to fifth embodiments of the present invention. There is waste on the upper side of the water-impervious membrane 10, and the electric current flowing through the disposal site by the voltage applied between one linear electrode and the other linear electrode selected on the upper side of the water-impervious membrane 10. Is a combined current of the current flowing through the waste and the current flowing through the water barrier film 10.

When there is no breakage in the water barrier film 10, there is a current flowing through the waste, but the current flowing through the water barrier film 10 flows through the capacitance component of the water barrier film 10, so that it is relatively small. It becomes a current. In the current measurement, a current flowing through one selected linear electrode below the water-impervious film 10 is measured. Therefore, if the water-impervious film 10 is not damaged, a very small current is detected in the measurement result. Will be.

FIG. 7 shows the processing circuit of FIG. 1 or FIG.
FIG. 5 is a diagram illustrating an example of a measurement result when the processing circuit illustrated in FIG. 4 is used. Even when there are two breaks in the water barrier film 10, the current values tend to increase at each of the break locations, and the two breaks in the water barrier film are clearly separated.

[0045]

As is clear from the above description, in the present invention, a plurality of linear electrodes intersecting above and below the water-impervious film in the controlled type wastewater treatment plant are installed, and An electrode is selected and connected to one of the AC power sources, and at least three linear electrodes on both sides of the linear electrode and at least three linear electrodes below the water-impermeable film are connected to the other of the AC power source, By measuring the current component flowing through the center electrode of at least three linear electrodes below the membrane, the current path flowing through the water-blocking membrane is connected to one of the AC power sources above the water-blocking membrane. The center is limited to the width of the linear electrodes on both sides, and the current measurement is also performed on the lower side of the impermeable film centering on one linear electrode selected from the linear electrodes connected to the other of the AC power supply. Because the width is limited to the width of the linear electrodes on both sides, multiple It is possible to eliminate the mutual impact of the damage.

Further, in the present invention, since the linear electrode for measurement is installed near the water-impermeable film, the difference in electrical characteristics depending on the type of waste to be treated in the disposal site and the depth of the burial are determined by the detection accuracy. There is also an effect that does not affect.

Therefore, the method of detecting a water leak position according to the present invention not only has a great effect economically, but also has a great effect that a water leak occurrence position can be detected at an early stage and environmental destruction can be minimized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration of a third exemplary embodiment of the present invention.

FIG. 4 is a diagram illustrating a configuration of a fourth exemplary embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a fifth embodiment of the present invention.

FIG. 6 is a diagram for explaining a current path common to the embodiments of FIGS. 1 to 5;

FIG. 7 is a diagram showing an example of a measurement result in the processing circuit according to the present invention.

FIG. 8 is a configuration diagram showing an example of a conventional water leakage occurrence position detection method.

[Explanation of symbols]

 Reference Signs List 11 two-phase AC power supply 12 power amplifier circuit 13 current detection circuit 14 first electrode selector 15 second electrode selector 16 first phase detection circuit 17 second phase detection circuit 18 square circuit 19, 29 division circuit 20 A / D converter 21 Computer

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Ken Arai 2-3-5 No. 507, Shiki-shi, Saitama 507

Claims (8)

[Claims] In a controlled type final treatment plant constructed by laying a water-blocking film, a plurality of linear electrodes arranged at predetermined intervals in parallel above the water-blocking film; A plurality of linear electrodes arranged at predetermined intervals so as to intersect the upper linear electrodes in parallel with the lower side, an AC power source, and selecting one of the upper linear electrodes; One of the plurality of lower linear electrodes is selected, and only one of the selected upper or lower linear electrodes is connected to one of the AC power supplies, and all other linear electrodes are connected to the other of the AC power supplies. Selective connection means for connecting, a linear electrode connected to one side of an AC power supply, and a linear electrode selected on the opposite side for detecting a current flowing through a water-blocking film. And a detecting means for receiving the output of the current detecting circuit and detecting the current. When a plurality of upper and lower linear electrodes are sequentially selected and a combination of linear electrodes close to the position where water leakage occurs due to breakage of the water barrier film, the output of the detection means is higher than the values of other electrode combinations. And a processing circuit for detecting a water leak occurrence position from rising or falling. 2. The water leakage occurrence position detection method according to claim 1, wherein said detection means performs phase detection of an output of said current detection circuit with reference to an applied voltage of said AC power supply. Water leak position detection method. 3. The method according to claim 1, wherein the processing circuit receives the output of the current detection circuit and performs phase detection at the same phase as the applied voltage of the AC power supply. A second phase detection circuit that receives an output of the current detection circuit and performs phase detection with a phase lead of 90 degrees from an applied voltage of the AC power supply; and outputs the output value of the first phase detection circuit to the second phase detection circuit. A dividing circuit that performs division by an output value of the phase detection circuit of (2), and sequentially selects upper and lower linear electrodes of the water-impervious film and a line closer to a water leakage occurrence position due to breakage of the water-impervious film. A water leakage occurrence position detection method wherein the output of the division circuit rises or falls below the value of another linear electrode combination when a combination of linear electrodes is formed. 4. The method according to claim 1, wherein the processing circuit receives the output of the current detection circuit and performs phase detection at the same phase as the applied voltage of the AC power supply. A second phase detection circuit that receives an output of the current detection circuit and performs phase detection with a phase leading by 90 degrees from an applied voltage of the AC power supply; and receives an output of the first phase detection circuit, A squaring circuit for squaring the output of the first phase detection circuit, and a division circuit for dividing the output value of the squaring circuit by the output value of the second phase detection circuit, When the linear electrodes on the lower side are sequentially selected and a combination of linear electrodes close to the position where water leakage occurs due to breakage of the water barrier film, the output of the division circuit is higher than the values of other linear electrode combinations. Detecting the location of water leak occurrence from rising or falling Leak occurrence position detection method according to claim. 5. In a controlled type final treatment plant constructed by laying a water-impervious film, a plurality of linear electrodes arranged at predetermined intervals in parallel above the water-impervious film; A plurality of linear electrodes arranged at predetermined intervals so as to intersect the upper linear electrodes in parallel to the lower side, an AC power source, and three adjacent linear electrodes of the upper linear electrodes are selected. At the same time, three adjacent ones of the plurality of lower linear electrodes are selected, and only the central linear electrode on one side of the selected upper three or lower three electrodes is connected to the AC power source. Selective connection means for connecting to one side and all other linear electrodes to the other side of the AC power supply, a central linear electrode connected to one side of the AC power supply, and three selected on the opposite side To detect the current flowing through the impermeable film between the center of the linear electrodes and the linear electrode A current detection circuit, and a detection means for receiving the output of the current detection circuit to perform detection, and sequentially selecting a plurality of linear electrodes on the upper and lower sides of the water-impervious film, and detecting a water leakage occurrence position due to breakage of the water-impervious film. And a processing circuit for detecting a leak occurrence position because the output of the detection means rises or falls below the value of the other electrode combination when the combination of the linear electrodes becomes close to Occurrence position detection method. 6. The water leakage occurrence position detection system according to claim 5, wherein said detection means performs phase detection of an output of said current detection circuit with reference to an applied voltage of said AC power supply. Water leak position detection method. 7. The water leakage occurrence position detection method according to claim 5, wherein the processing circuit receives the output of the current detection circuit and performs phase detection at the same phase as the applied voltage of the AC power supply. A second phase detection circuit that receives an output of the current detection circuit and performs phase detection with a phase lead of 90 degrees from an applied voltage of the AC power supply; and outputs the output value of the first phase detection circuit to the second phase detection circuit. A dividing circuit that performs division by an output value of the phase detection circuit of (2), and sequentially selects upper and lower linear electrodes of the water-impervious film and a line closer to a water leakage occurrence position due to breakage of the water-impervious film. A water leakage occurrence position detection method wherein the output of the division circuit rises or falls below the value of another linear electrode combination when a combination of linear electrodes is formed. 8. The method according to claim 5, wherein the processing circuit receives the output of the current detection circuit and performs phase detection at the same phase as the applied voltage of the AC power supply. A second phase detection circuit that receives an output of the current detection circuit and performs phase detection with a phase leading by 90 degrees from an applied voltage of the AC power supply; and receives an output of the first phase detection circuit, A squaring circuit for squaring the output of the first phase detection circuit, and a division circuit for dividing the output value of the squaring circuit by the output value of the second phase detection circuit, When the linear electrodes on the lower side are sequentially selected and a combination of linear electrodes close to the position where water leakage occurs due to breakage of the water barrier film, the output of the division circuit is higher than the values of other linear electrode combinations. Detecting the location of water leak occurrence from rising or falling Leak occurrence position detection method according to claim.