KR20230109967A - Apparatus For Measuring Quality Of Water By Depth And Measuring Method - Google Patents

Abstract

The present invention relates to a water quality measuring device for measuring water quality by depth and a water quality measuring method using the same, and more particularly, to a water quality sensor for measuring water quality; a cable connected to one end of the water quality sensor and having a predetermined length for transmitting data measured by the water quality sensor; and a winch accommodating the cable, wherein a tension adjusting function is provided so that the tension of the cable is maintained within a predetermined range.

Description

Apparatus For Measuring Quality Of Water By Depth And Measuring Method

The present invention relates to an apparatus for measuring water quality at different depths and a method for measuring water quality using the same, and more particularly, to a water quality measuring apparatus at different depths capable of real-time and unattended tracking and observation of a change in water quality at each depth of groundwater and a saltwater interface, and a water quality measuring method using the same.

The brackishwater interface is the interface formed by the concentration difference between freshwater and seawater in the ground. It has characteristics that change in real time due to artificial or natural changes such as rainfall, groundwater pumping, weir opening, or seawater increase.

Existing methods for observing the freshwater interface include a method of observing electrical conductivity over time by installing a sensor at a specific depth or observing a change in vertical electrical conductivity at a specific time. This method has a problem in that there is no way to respond when the freshwater boundary surface is different from the location where the sensor is installed. The method to deal with this problem has the disadvantage that the manager has no choice but to visit the site and manually find the changed saltwater interface.

Korean Patent Publication No. 2019-0045538

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a water quality measurement device for each depth that can accurately measure and observe the water quality for each depth even if the water quality for each depth changes due to various external factors and a method for measuring water quality using the same.

In addition, an object of the present invention is to provide a water quality measuring device by depth and a water quality measuring method using the same, which can check the water level and change at the brackish water boundary from a distance without an observer visiting the site.

In addition, an object of the present invention is to provide a water quality measuring device for each depth capable of raising and lowering a cable connected to a water quality sensor at a constant speed and a water quality measuring method using the same.

A water quality measuring device for measuring water quality by depth of the present invention to solve the above problems includes a water quality sensor 100 for measuring water quality; a cable 200 connected to one end of the water quality sensor 100 and having a predetermined length for transmitting data measured by the water quality sensor 100; and a winch 300 accommodating the cable 200, characterized in that a tension adjusting function is provided so that the tension of the cable 200 is maintained within a predetermined range.

In addition, in the water quality measuring device for measuring water quality by depth according to the present invention, the tension adjusting function is performed by a cable drum 330 connected to one end of the cable 200 for winding or unwinding, and a roller 340 located in front of the cable drum 330 and supporting a predetermined portion of the cable 200 and sensing the tension of the cable 200.

In addition, in the water quality measuring device for measuring water quality by depth according to the present invention, the roller 340 is characterized in that it includes a first roller 341 having a predetermined outer diameter, one or more second rollers 342 positioned near the outer edge of the first roller 341, and a third roller 343 positioned at a predetermined distance from the first roller 341 and equipped with a tension measuring sensor.

In addition, in the water quality measuring device for measuring water quality by depth according to the present invention, the cable 200 is mounted to move between the first roller 341 and the second roller 342, the third roller 341, and the cable drum 330 in this order.

In addition, in the water quality measuring device for measuring water quality by depth according to the present invention, the first roller 341 and the cable drum 330 are characterized in that they are provided with a function for measuring the rotational speed, respectively.

In addition, in the water quality measuring device for measuring water quality by depth according to the present invention, a first drive motor 391 is connected to the first roller 341, and a second drive motor 392 is connected to the cable drum 330. Characterized in that it is connected.

In addition, in the water quality measuring device for measuring water quality by depth according to the present invention, a path changing unit 370 for changing the moving path of the cable 200 is further provided between the third roller 341 and the cable drum 330.

In addition, in the water quality measuring device for measuring water quality by depth according to the present invention, an exhaust fan 350 for removing moisture attached to the cable 200 is further provided inside the winch 300.

In addition, in the water quality measuring device for measuring water quality by depth according to the present invention, the air exhaust unit 350 includes a pair of first body parts 351 and a second body part 353 facing each other with the cable 200 interposed therebetween, the first body part 351 having a first accommodation groove 351(a) recessed to a predetermined depth and a first sled located below the first accommodation groove 351(a). A lit 351 (b), a first exhaust fan 352 is accommodated in the first accommodating groove 351 (a), and the second body portion 353 includes a second accommodating groove 353 (a) recessed to a predetermined depth and a second slit 353 (b) positioned above the second accommodating groove 353 (a), and the second accommodating groove 353 (a) includes a second exhaust fan ( 354) is characterized in that it is stored.

In addition, in the water quality measuring device for measuring water quality by depth according to the present invention, a limit sensor 380 for controlling the position of the cable 200 is further provided inside the winch 300.

In addition, in the water quality measuring device for measuring water quality by depth according to the present invention, a sensor trigger 210 is mounted near one end of the cable 200 connected to the water quality sensor 100.

In addition, the method of measuring water quality by depth using the water quality measuring device for measuring water quality by depth of the present invention includes the steps of (S1) lowering the cable 200 connected to the water quality sensor 100 to an observation hole; (S2) measuring the water quality by the water quality sensor 100 and storing the measured water quality result in the controller 320; and (S3) raising the cable 200 connected to the water quality sensor 100 from the observation hole. In the step (S1), the cable 200 is stopped at a predetermined location for a predetermined time and then lowered again.

In addition, in the method for measuring water quality by depth of the present invention, the steps (S1) to (S3) are repeatedly performed a plurality of times at predetermined intervals.

The apparatus for measuring water quality according to the depth of the present invention has a function of constantly adjusting the tension of the cable, and thus has the advantage of being able to accurately measure the distance of the cable going up and down and thus increasing the reliability of the measurement result.

In addition, since the water quality measuring device for each depth of the present invention can be remotely controlled and managed, there is an advantage in that measurement and management costs can be reduced.

In addition, the water quality measuring method using the water quality measuring device for each depth of the present invention has the advantage of not only being able to accurately measure various water qualities at a corresponding depth, but also easily tracking and observing changes in the freshwater interface.

1 is a perspective view of a water quality measuring device according to a preferred embodiment of the present invention viewed from one direction.
2 is a perspective view of a water quality measuring device according to a preferred embodiment of the present invention viewed from the other direction.
Figure 3 is a perspective view of the water quality measurement device according to a preferred embodiment of the present invention viewed from the rear in a state except for a part of the case.
4 is an internal cross-sectional view of a water quality measuring device according to a preferred embodiment of the present invention.
5 is an internal perspective view of a water quality measuring device according to a preferred embodiment of the present invention.
6 is an enlarged perspective view of a control unit of a water quality measuring device according to a preferred embodiment of the present invention.
7 is a view for explaining the operation of the roller in the water quality measuring device according to a preferred embodiment of the present invention.
8 is a view for explaining a driving motor for driving a roller and a cable drum in a water quality measuring device according to a preferred embodiment of the present invention.
9 is an algorithm for explaining how cable tension is controlled by a roller and a cable drum in a water quality measuring device according to a preferred embodiment of the present invention.
10 is an exploded perspective view of the air exhaust unit in the water quality measuring device according to a preferred embodiment of the present invention.
11 is a front view of the body part constituting the exhaust part in the water quality measuring device according to a preferred embodiment of the present invention.
12 is a block diagram of a control unit of a water quality measuring device according to a preferred embodiment of the present invention.
13 is a flowchart illustrating a water quality measuring method using a water quality measuring device according to a preferred embodiment of the present invention.

In this application, terms such as “comprise”, “have” or “have” are intended to designate that the features, numbers, steps, components, parts, or combinations thereof described in the specification exist, but it should be understood that the presence or addition of one or more other features or numbers, steps, operations, components, parts, or combinations thereof is not excluded in advance.

It should be understood that when an element is referred to as being “connected” or “connected” to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle. Other expressions describing the relationship between elements, such as "between" and "directly between" or "adjacent to" and "directly adjacent to", etc., should be interpreted similarly.

Hereinafter, a water quality measuring device and a water quality measuring method for measuring water quality by depth according to the present invention will be described with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and redundant descriptions of the same components are omitted.

1 is a perspective view of a water quality measuring device according to a preferred embodiment of the present invention viewed from one direction, and FIG. 2 is a perspective view of a water quality measuring device according to a preferred embodiment of the present invention viewed from the other direction.

Referring to FIGS. 1 and 2 , the water quality measuring device according to the present invention includes a water quality sensor 100 , a cable 200 and a winch 300 .

First, the water quality sensor 100 may be a salinity recorder sensor for groundwater quality, for example, electrical conductivity and water temperature, or a sensor capable of checking the salinity concentration at each water depth by simultaneously measuring the water depth.

The cable 200 transmits the data measured by the water quality sensor 100 in a wired manner and supports the water quality sensor 100, and the water quality sensor 100 is connected to one end and the winch 300 is connected to the other end.

Here, the cable 200 may be a copper wire or an optical cable, preferably an optical cable. In the present invention, the cable 200 to which the water quality sensor 100 is connected can reach hundreds of meters in length to be observed, and therefore, when an optical cable is used, it has less energy loss than a copper wire, making it suitable for long-distance transmission, and a large amount of information that can be transmitted. In addition, it has the advantage of not receiving electrical or magnetic interference from nearby cables.

On the other hand, it is preferable that a sensor trigger 210 is provided near one end of the cable 200 connected to the water quality sensor 100 to help confirm the elevated position of the water quality sensor 100, and will be described later in this regard.

3 is a perspective view of the water quality measuring device according to a preferred embodiment of the present invention as seen from the rear side except for a part of the case, FIG. 4 is an internal cross-sectional view of the water quality measuring device according to a preferred embodiment of the present invention and FIG.

1 to 5, the winch 300 is intended to rise or lower the cable 200 at a constant speed in the observatory installed at the point where the groundwater measurement is required, and the case 310, the controller 320, the cable drum 330, the roller 340, the bowl part 350, the guide plate 360, the path change unit (360) 370), the limit sensor 380, and the drive motor.

In more detail, the case 310 having a predetermined shape is to protect various parts provided therein from external impact, and in particular, a handle 311 is provided on the upper surface of the case 310 so that the operator can easily grip and move it. It is preferable to provide.

The control unit 320 functions to transmit the data transmitted from the cable 200 to the control center while the operator directly manipulates the operation of various parts constituting the cable 200 and the winch 300 remotely or at a short distance. It is mounted in a state exposed to the outside of the case 310. Of course, the control unit 320 controls only the operation of the cable 200 and the winch 300, and it is also possible to provide a separate data transmission unit for transmitting the collected data.

Referring to FIG. 6, which is an enlarged perspective view of the control unit of the water quality measuring device according to a preferred embodiment of the present invention, in more detail, the control unit 320 having the above-described functions includes a POWER button 321, a Manaul button 322, a joystick switch 323, an IoT indicator light 324, a Data indicator light 325, and terminals 326, for example, a FAN terminal 326 (a), a control terminal 326 ( b)), a debug terminal 326 (c)), an LTE terminal 326 (d), a sensor terminal 326 (e), and a GPS antenna terminal 326 (f).

The POWER button 321 is made of a power switch and a light emitting diode (LED) that displays the power-on state, and the Manaul button 322 is a manual mode when the manager manually operates the winch 300 at the observation site. It is a button for switching.

In addition, the joystick switch 323 is used to lower or raise the water quality sensor 100 in manual operation mode, and the IoT indicator light 324 blinks when requesting transmission to the IoT wireless network, while it is displayed in a lit state when connected to the IoT wireless network.

Data indicator 325 is to check whether data is transmitted through the IoT wireless network, and is turned on during transmission.

On the other hand, the FAN terminal 326 (a) is a connection terminal connected when a fan heater is placed outside the winch 300 to maintain the inside of the winch 300 in a constant temperature and humidity state.

The debug terminal 326(c) is an interface for manufacturing convenience to accurately grasp the state of the control board, and the LTE terminal 326(d) is a terminal for connecting a wireless antenna for accessing an IoT wireless network. In addition, when the winch 300 is installed outdoors, the sensor terminal 326 (e) is for checking the open/closed state of the door of the enclosure (not shown) for protecting the winch 300, and the GPS antenna terminal 326 (f) is a terminal to which a GPS antenna is connected so that accurate location information of the winch 300 can be grasped by GPS.

Referring again to FIGS. 1 to 5, continuing the description, the cable drum 330 is connected to one end of the cable 200, the cable 200 is usually wound up, and when measuring water quality, the water quality sensor 100 operates to wind or unwind the cable 200 so that it can reach a desired position. Here, reference numeral 331 is a drum embankment having an 'H' cross-sectional shape to prevent the cable 200 from escaping from the cable drum 330.

Meanwhile, reference numeral 380 is a limit sensor 380 and is a sensor that detects the position of the sensor trigger 210 connected to the cable 200 .

7 is a view for explaining the operation of the roller in the water quality measuring device according to a preferred embodiment of the present invention, FIG. 8 is a view for explaining a drive motor for driving the roller and the cable drum in the water quality measuring device according to a preferred embodiment of the present invention, and FIG. 9 is an algorithm for explaining how the cable tension is controlled by the roller and the cable drum in the water quality measuring device according to a preferred embodiment of the present invention.

7 to 9 will be described in relation to cable tension control.

When measuring the water quality by depth using the water quality measuring device of the present invention, the cable 200 must be descended to a depth of several tens of meters or more through a pipe layer, and since the cable 200 contacts water, a significant load is applied to the cable 200 and it is easy to slip.

Therefore, in the present invention, a tension adjusting function capable of adjusting the tension of the cable 200 within a certain range is provided to cope with the above-mentioned problems, and this function can be implemented by the above-described cable drum 330 and roller 340.

The roller 340 is located in front of the cable drum 330 to support a predetermined portion of the cable 200 and to sense the tension of the cable 200, and may be composed of a total of three rollers, such as a first roller 341, a second roller 342, and a third roller 343.

Specifically, the first roller 341 is located at a predetermined distance from the cable drum 330 and has a smaller outer diameter than the cable drum 330 .

The second roller 342 may be composed of two, and is positioned to face each other at the top of the outer edge of the first roller 341 . Here, the first roller 341 and the second roller 342 are separated by a predetermined distance so that the cable 200 can pass between the first roller 341 and the second roller 342 in a state of close contact, that is, in an engaged state.

The third roller 343 is a roller equipped with a sensor (not shown) for measuring tension while maintaining tension in the cable 200. A depression is formed in the center of the circumferential surface so that the cable 200 does not escape, and is located slightly apart from the first roller 341 by a predetermined distance.

Referring to the arrangement of the cable 200 with reference to FIG. 7, while one side is connected to the water quality sensor and the other side is connected to the cable drum 330, a predetermined portion is seated on top of the first roller 341, and is in close contact with a pair of second rollers 342 facing each other.

In addition, the cable 200 toward the cable drum 330 passes through the third roller 343 and is disposed toward the cable drum 330 . Here, the cable 200 is arranged to move in an approximate 'S' direction by the cable drum 330 and the third roller 343, and it is preferable that a guide plate 360 for guiding the movement path of the cable 200 and a path changer 370 for changing the path of the cable 200 are further provided near the cable drum 330 and the roller 340.

Meanwhile, the first roller 341 and the cable drum 330 can be rotated in one direction or both directions by a pair of drive motors 390, specifically, the first roller 341 and the cable drum 330 can be rotated by the second drive motor 392, and the first roller 341 and the cable drum 330 have sensors such as an encoder and a tachometer that can measure the rotational speed. may be provided. Of course, sensors (not shown) capable of measuring their rotational speed may be separately installed near the first roller 341 and the cable drum 330 .

A method of adjusting tension when winding a cable through the cable drum 330 and the roller 340 will be described with reference to FIG. 9 .

First, the operator inputs the winding speed of the first roller 341 and the tension value of the third roller 343. Then, the first drive motor 391 rotates in conjunction so that the first roller 341 can wind the cable 200 at the set speed, and the second drive motor 392 rotates in conjunction with the cable drum 330 so as to correspond to the set tension value.

Of course, it is obvious that it can be driven according to the above-described operating principle even when the cable is unwound.

Here, the first driving motor 391 and the second driving motor 392 are preferably micro stepping motors to enable precise driving and control, but are not limited thereto.

10 is an exploded perspective view of the air exhaust unit in the water quality measuring device according to a preferred embodiment of the present invention, and FIG. 11 is a front view of the body constituting the air exhaust unit in the water quality measuring device according to a preferred embodiment of the present invention.

Referring to FIGS. 10 and 11, the air exhaust unit 350 is described. Moisture adheres to the cable 200 introduced into the observation hole to measure water quality, and the air exhaust unit 350 is configured to remove such moisture.

The exhaust unit 350 is composed of a pair of first and second body parts 351 and 353 facing each other with the cable 200 interposed therebetween, and a first fan 352 and a second fan 354 mounted on the first body part 351 and the second body part 353, respectively.

First, the first body portion 351 is provided with a first accommodating groove 351 (a) recessed to a predetermined depth and a first slit 351 (b) located below the first accommodating groove 351 (a), and the first fan 352 is located in the first accommodating groove 351 (a). Also, in the case of the second body portion 353, a second accommodating groove 353 (a) recessed to a predetermined depth and a second slit 353 (b) positioned above the second accommodating groove 353 (a) are provided, and the second fan 354 is accommodated in the second accommodating groove 353 (a).

In this way, the first fan 352 and the second fan 354 are positioned diagonally from each other with a predetermined distance apart, which is to prevent the winds generated by the first fan 352 and the second exhaust fan 354 from colliding with each other.

On the other hand, a pair of inclined surfaces facing each other are located in the first accommodating groove 351 (a) and the second accommodating groove 353 (a) spaced apart from each other by a predetermined distance, so that the wind from the first fan 352 and the second fan 354 can be intensively supplied toward the cable 200, thereby increasing drying efficiency.

In addition, a plurality of bars are provided in the first slit 351 (b) and the second slit 353 (b), which is to prevent the cable 200 from protruding through the slit even if the wind generated by the fan is strong.

12 is a block diagram of a control unit of a water quality measuring device according to a preferred embodiment of the present invention.

As shown in FIG. 12, the controller includes a data processing unit that transmits observation data, an OP unit that reads manual/automatic selection control commands and displays status with LEDs, a winch control unit that controls motor driving and tension for cable lifting and lowering motion, a DC power supplied from a solar power generation set required for driving a winch. A power management unit that converts DC power required by the system, a data logger that stores and manages observation data in memory, a GPS location detector, transmits observation data and receives control commands. It can be composed of a wireless modem unit that does.

13 is a flowchart illustrating a water quality measuring method using a water quality measuring device according to a preferred embodiment of the present invention.

As shown in FIG. 13, the water quality measurement method according to the present invention includes (S1) lowering the cable 200 connected to the water quality sensor 100 to the observation hole; (S2) measuring the water quality by the water quality sensor 100 and storing the measured water quality result in the controller 320; and (S3) raising the cable 200 connected to the water quality sensor 100 from the observation hole.

First, in relation to step (S1), it is a step of lowering the cable 200 into an observation hole where water quality measurement is required. At this time, after determining the depth in advance, the cable 200 is lowered until the depth is reached, or the cable 200 is lowered to a depth corresponding to a predetermined condition, for example, the saltwater interface.

Here, the depth position corresponding to the saltwater interface can be determined from whether it falls within the preset reference value range while continuously measuring the electrical conductivity, etc., but is not limited thereto, and continues to drop if it does not fall within the reference value range. It is obvious.

Step (S2) is a step of recording and storing various information such as measurement time, water quality measurement value, and cable length in the data logger. At this time, it is preferable that the elevation and descent are stopped for a predetermined period at the corresponding depth so that accurate water quality measurement for each depth is possible.

Meanwhile, after water quality measurement at a specific depth is completed, (S1) may be performed again to measure water quality at a different depth.

Step (S3) includes measuring the water quality by depth while recovering the cable 200 after the water quality measurement is completed, or moving the cable 200 up and down, or tracking the brackish water interface.

For example, when the depth at step S2 corresponds to the lowest depth, the water quality can be measured for each predetermined depth while raising the cable 200 .

In addition, when the measured value in step (S2) corresponds to the salt water area, the location corresponding to the salt water interface may be searched for by moving the cable 200 up and down to find the fresh salt water interface.

Meanwhile, steps (S1) to (S3) as described above may be repeatedly performed a plurality of times.

As a specific part of the present invention has been described in detail above, to those skilled in the art, these specific techniques are only preferred embodiments, and the scope of the present invention is not limited thereby, and within the scope and spirit of the present invention, it is obvious to those skilled in the art that various changes and modifications are possible, and it is natural that these variations and modifications fall within the scope of the appended claims.

100: water quality sensor
200: cable
210: sensor trigger
300: winch
310: case 311: handle
320: control unit
321: POWER button 322: Manaul button
323: joystick switch 324: IoT indicator
325: Data indicator
326: terminal
326(a): FAN terminal 326(b): Control terminal
326(c): Debug terminal 326(d): LTE terminal
326(e): Sensor terminal 326(f): GPS antenna terminal
330: cable drum
331: drum embankment
340: roller
341: first roller 342: second roller
343: third roller
350: exhaust part
351: first body part
351 (a): first receiving groove 351 (b): first slit
352: first fan
353: second body
353 (a): second receiving groove 353 (b): second slit
354: second fan
360: guide plate
370: route change unit
380: limit sensor
390: drive motor
391: first drive motor 390: second drive motor

Claims (13)

As a water quality measuring device for measuring water quality by depth,
A water quality sensor 100 for measuring water quality;
a cable 200 connected to one end of the water quality sensor 100 and having a predetermined length for transmitting data measured by the water quality sensor 100; and
Including a winch 300 for accommodating the cable 200,
A water quality measuring device for measuring water quality by depth, characterized in that a tension adjusting function is provided so that the tension of the cable 200 is maintained within a predetermined range.
According to claim 1,
The tension adjusting function is performed by a cable drum 330 connected to one end of the cable 200 for winding or unwinding, and a roller 340 positioned in front of the cable drum 330 and supporting a predetermined portion of the cable 200 and sensing the tension of the cable 200. Water quality measuring device for measuring water quality by depth, characterized in that.
According to claim 2,
The roller 340 includes a first roller 341 having a predetermined outer diameter, one or more second rollers 342 positioned near the outer edge of the first roller 341, and a third roller 343 positioned at a predetermined distance from the first roller 341 and equipped with a tension measuring sensor.
According to claim 3,
The cable 200 is mounted to move between the first roller 341 and the second roller 342, the third roller 341, and the cable drum 330 in that order.
According to claim 4,
The first roller 341 and the cable drum 330 are water quality measuring devices for measuring water quality by depth, characterized in that each equipped with a function for measuring the rotational speed.
According to claim 5,
A water quality measuring device for measuring water quality by depth, characterized in that a first drive motor 391 is connected to the first roller 341 and a second drive motor 392 is connected to the cable drum 330.
According to claim 4,
A water quality measuring device for measuring water quality by depth, characterized in that a path changing unit 370 for changing the moving path of the cable 200 is further provided between the third roller 341 and the cable drum 330.
According to claim 1,
Inside the winch 300, a water quality measuring device for measuring water quality by depth, characterized in that further provided with a vent 350 for removing moisture attached to the cable 200.
According to claim 8,
The air exhaust unit 350 includes a pair of first body parts 351 and a second body part 353 positioned facing each other with the cable 200 interposed therebetween,
The first body part 351 includes a first accommodating groove 351 (a) recessed to a predetermined depth and a first slit 351 (b) positioned below the first accommodating groove 351 (a), and a first exhaust fan 352 is accommodated in the first accommodating groove 351 (a),
The second body part 353 includes a second accommodating groove 353(a) recessed to a predetermined depth and a second slit 353(b) positioned above the second accommodating groove 353(a), and a second exhaust fan 354 is accommodated in the second accommodating groove 353(a).
According to claim 1,
A water quality measuring device for measuring water quality by depth, characterized in that a limit sensor 380 for controlling the position of the cable 200 is further provided inside the winch 300.
According to claim 1,
A water quality measuring device for measuring water quality by depth, characterized in that a sensor trigger 210 is mounted near one end of the cable 200 connected to the water quality sensor 100.
In the method for measuring water quality by depth using the water quality measuring device according to any one of claims 1 to 11,
(S1) descending the cable 200 connected to the water quality sensor 100 to the observation hole;
(S2) measuring the water quality by the water quality sensor 100 and storing the measured water quality result in the controller 320; and
(S3) raising the cable 200 connected to the water quality sensor 100 from the observation hole; including,
In the step (S1), the method of measuring water quality by depth using a water quality measuring device, characterized in that the water quality measuring device is lowered again after stopping for a predetermined time at a predetermined position.
According to claim 12,
The method of measuring water quality by depth using a water quality measuring device, characterized in that the steps (S1) to (S3) are repeatedly performed a plurality of times at predetermined intervals.

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