KR101190325B1 - Seawater Intrusion Monitoring Apparatus and Method Thereof - Google Patents

Abstract

Apparatus and method for monitoring seawater penetration are disclosed. The groundwater mixer of the seawater penetration monitoring apparatus mixes groundwater having a multi-layered structure according to salinity, and the sensor unit includes at least one sensor that senses water quality information of the groundwater mixed by the groundwater mixer, and the storage unit is sensed by the sensor unit. Water quality information can be stored.

Description

Seawater Intrusion Monitoring Apparatus and Method Thereof}

The present invention relates to a seawater penetration monitoring device and method, and more particularly, to a seawater penetration monitoring device and method that can determine whether or not seawater has penetrated groundwater using at least one water quality sensor.

If the population living in the coastal area increases, the economic activity and industrial facilities in the coastal area will increase, and accordingly, the demand for water, such as living water and agricultural water, will increase in the coastal area. However, if there is a shortage of water supply facilities in the sea area, the water in the sea area will depend on coastal groundwater. Coastal groundwater is divided into brine with high salinity due to the inflow of seawater and freshwater adjacent to land. Most living water is supplied from freshwater in coastal groundwater.

Excessive use of coastal groundwater in contact with seawater causes seawater infiltration into the freshwater layer, and saltwater with high salinity flows into the freshwater layer used as coastal groundwater, preventing coastal groundwater from being used for living and agricultural water. . One technique introduced to prevent this problem is to monitor seawater penetration.

Conventional techniques for monitoring seawater infiltration use electrical conductivity measurement. For example, the conventional conductivity measurement method measures the salt concentration by putting an conductivity sensor in the observation well. However, this method of measurement involves the burden of inserting heavy sensor probes and cables into the observation well and changing the depth of field. In addition, since one conductivity sensor is used, conductivity of various depths cannot be measured.

Another method of measuring the conductivity is to install a plurality of conductivity sensors per depth of field in the observation well, and connected to the ground monitoring device to measure the position of the interface and the change in position. The location of the interface is the boundary between the freshwater and transition layers, and the boundary between the transition and sea layers. However, since the measurement method only measures the penetration of seawater to the location where the sensors are installed, it is difficult to accurately determine the thickness of each layer as well as the interface between fresh water and seawater existing between the sensor and the sensor. Difficulty in injury and increased costs due to multiple sensors.

The present invention to solve the above problems, by using at least one sensor to measure the water quality of the groundwater, based on the measured water quality information to determine the thickness of each layer in the groundwater, to determine whether the seawater infiltration It is an object of the present invention to provide an apparatus and method for monitoring seawater penetration.

According to one embodiment of the invention, the groundwater mixer for mixing the groundwater existing in the observation well; A sensor unit including at least one sensor for sensing the water quality information of the ground water mixed by the ground water mixer; And a determination unit determining whether seawater has infiltrated on the basis of the stored water quality information.

It further includes a storage unit for storing the water quality information sensed by the sensor unit.

The storage unit may be provided in a remote terminal unit (RTU) for transmitting the stored water quality information to a central controller.

Standard water quality information of the mixed water-the water quality information that is sensed by mixing the ground water in advance-and the database in which the thickness of at least one of the brine layer, fresh water layer and the transition layer of the ground water is mapped and stored; The determination unit may determine whether the seawater penetrates by referring to the water quality information sensed by the sensor unit and the reference water quality information stored in the database.

The reference water quality information may also be mapped to and stored in at least one of a temperature at which the reference water quality information is sensed and a total volume of groundwater in which the reference water quality information is sensed.

The sensor unit further includes a temperature sensor for measuring the temperature of the groundwater.

The groundwater mixer, the air pump for injecting air from the land; An diffuser provided in the groundwater, the diffuser providing a movement path of the air injected by the air pump; And a nozzle provided in the bottom layer of the ground water and discharging air moving through the diffuser in a bubble form, wherein the bubble-type air discharged from the nozzle may mix the ground water.

The groundwater mixer further includes a sensor for measuring the thickness of the groundwater.

On the other hand, according to another embodiment of the present invention, the step of mixing the groundwater in the observation well using the groundwater mixer; Sensing water quality information of the mixed groundwater using at least one sensor; And storing the sensed water quality information.

And determining whether seawater infiltrates based on the stored water quality information.

The determining may include determining whether the seawater is infiltrated by referring to the sensed and stored water quality information and the reference water quality information stored in the database, and the reference water quality information stored in the database is previously sensed by mixing the groundwater. to be.

And measuring the temperature of the groundwater.

In the mixing of the groundwater, the air injected by the air pump may be moved to the nozzle in the groundwater through the diffuser, and the groundwater may be mixed by discharging the air in the form of bubbles through the nozzle.

According to an embodiment of the present invention, the brine layer, the transition layer and the freshwater layer of groundwater are mixed using air, the water quality information of the mixed groundwater is sensed using at least one sensor, and based on the sensed water quality information. By determining whether seawater penetrates, it is possible to minimize costs and improve the convenience of facilities required for sensing.

In addition, according to an embodiment of the present invention, while adjusting the thickness of the brine layer, transition layer and fresh water layer of the groundwater, the water quality information of the mixed water mixed with the groundwater is databased, and the databased information and the currently detected water quality information By using the water quality information, it is possible to determine the thickness of each layer of the groundwater and the penetration of seawater without complicated calculation process.

In addition, according to an embodiment of the present invention, by accumulating and storing the water quality information and the temperature information sensed by the sensor, and the thickness of each of the salt water layer, fresh water layer and the transition table stored in the database mapped to it, the administrator by the salt water layer In addition, the history of the change in thickness of each freshwater layer and transition zone can be easily identified.

1 is a view for explaining a general observation well and coastal groundwater formed in the coastal area,
2 is a view showing a seawater penetration monitoring apparatus according to an embodiment of the present invention
3A illustrates a nozzle according to an embodiment of the present invention;
3b illustrates a nozzle according to another embodiment of the present invention;
4 is a view showing a seawater penetration monitoring apparatus according to another embodiment of the present invention,
5 is a view for explaining the case where the water level of the groundwater does not change,
6 is a view for explaining a case where the groundwater level is changed, and,
7 is a flowchart illustrating a seawater penetration monitoring method of the seawater penetration monitoring apparatus according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more readily apparent from the following description of preferred embodiments with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In this specification, when an element is referred to as being on another element, it may be directly formed on another element, or a third element may be interposed therebetween. Also in the figures, the thickness of the components is exaggerated for an effective description of the technical content.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms "comprises" and / or "comprising" used in the specification do not exclude the presence or addition of one or more other elements.

Hereinafter, the present invention will be described in detail with reference to the drawings. In describing the specific embodiments below, various specific details have been set forth in order to explain the invention in greater detail and to assist in understanding it. However, those skilled in the art can understand that the present invention can be used without these various specific details. In some cases, it is mentioned in advance that parts of the invention which are commonly known in the description of the invention and which are not highly related to the invention are not described in order to prevent confusion in explaining the invention without cause.

1 is a view for explaining a general observation well and coastal groundwater formed in the coastal area.

Referring to FIG. 1, the coastal region is adjacent to the land and the sea, and a part of the coastal region is formed with an observation well 10. Observation well 10 is for monitoring the groundwater contamination or to observe the groundwater surface, groundwater is introduced. As shown in FIG. 1, the saltwater layer S, the transition layer T, and the freshwater layer F flow into the observation well 10. That is, the groundwater in the observation well 10 includes the saltwater layer S, the transition layer T, and the freshwater layer F. 'Ls' is the thickness of the brine layer (S), 'Lt' is the thickness of the transition layer (T), 'Lf' is the thickness of the freshwater layer (F).

The saltwater with high salinity forms a saltwater layer (S) due to the inflow of seawater in the area adjacent to the sea in the observation well (10), and the freshwater that can be used as general water forms a freshwater layer (F) due to low salinity. do. The transition layer T is a region transitioned from the saltwater layer S to the freshwater layer F and may be an interface between the saltwater layer S and the freshwater layer F. FIG.

According to an embodiment of the present invention, the saltwater layer (S), the transition layer (T) and the freshwater layer (F) in the observation well 10 before measuring the water quality (eg, salinity) of the groundwater using the seawater penetration monitoring device. ) Are often clearly distinguished. On the other hand, when the water quality information is measured using the seawater penetration monitoring apparatus according to an embodiment of the present invention, the groundwater is in a mixed state. That is, the seawater penetration monitoring apparatus may measure the water quality of the mixed water using at least one sensor after mixing the saltwater layer (S), the transition layer (T) and the freshwater layer (F).

2 is a view showing a seawater penetration monitoring apparatus according to an embodiment of the present invention.

Referring to FIG. 2, the seawater penetration monitoring apparatus includes a groundwater mixer 210, a sensor unit 220, and a remote terminal unit (RTU) 230.

The groundwater mixer 210 is a device for mixing groundwater in the observation well 10, and the groundwater in the observation well 10 may have multiple layers formed according to salinity. The multilayer of groundwater includes the brine layer, transition layer and fresh water layer described with reference to FIG. 1.

Groundwater mixer 210 may include an air pump 211, diffuser 212, and nozzle 213.

The air pump 211 injects air from the land into the observation well 10, ie, groundwater. The air pump 211 may be installed on the ground surface.

One side of the diffuser 212 is connected to the air pump 211 and the other side is connected to the nozzle 213. The diffuser 212 provides a path of movement of the air injected from the air pump 211, so that a portion of the diffuser 212 may be provided on the ground surface and the remainder in the groundwater.

The nozzle 213 is provided at the bottom of the observation well 10, that is, the lower part of the groundwater, and one side is connected to the other side of the diffuser 212 to receive air. The nozzle 213 may discharge air moved from the air pump 211 through the diffuser 212 in the form of bubbles. Bubble-type air is discharged from the water so that the groundwater having multiple layers can be mixed. That is, the brine layer, the transition layer and the fresh water layer of groundwater are mixed by bubble of bubble form, and groundwater becomes mixed water.

3A illustrates a nozzle according to an embodiment of the present invention, and FIG. 3B illustrates a nozzle according to another embodiment of the present invention.

Referring to FIG. 3A, the air moved through the diffuser 212 may discharge a plurality of outlets provided in the nozzle 213 to groundwater (eg, salt water layer) in the observation well 10. As the discharged air rises, mixed layers of groundwater can be mixed to form mixed water.

Referring to FIG. 3B, the nozzle 213 may be provided with a sensor 214 for measuring the thickness of groundwater. When the nozzle 213 reaches the bottom of the observation well 10 or reaches a position close to the bottom to discharge air, the sensor 214 is the distance from the sensor 214 (or from the nozzle 213) to the surface of the groundwater. That is, the thickness of the groundwater can be measured.

The sensor 214 may measure the thickness of the groundwater using a time of flight (TOF) method. In the TOF method, the sensor 214 emits ultrasonic waves to the surface of the groundwater, and measures the thickness of the groundwater in consideration of the speed of the ultrasonic waves and the time until the ultrasonic waves are reflected from the surface to reach the sensor 214 again.

Alternatively, the sensor for measuring the thickness of the ground water, that is, the water level, measures the water pressure at the point where the sensor is provided, and the remote terminal 230 may obtain the thickness of the ground water based on the measured water pressure. In this case, the sensor for measuring the water level may be provided in the shallow depth of the groundwater, that is, directly below the groundwater. Since the method of obtaining the water level using water pressure is a well-known technique, detailed description thereof will be omitted.

The sensor 214 may provide the remote terminal 230 with thickness information of the groundwater measured by being electrically connected to the remote terminal 230 to be described later. The measured groundwater thickness may be used together with the water quality information sensed from the mixed water to determine the volume of the groundwater and the thickness of each layer. In the present embodiment, the point sensor is used to measure the thickness, but the level sensor may be installed on the side of the observation well 10 to measure the thickness.

Referring back to FIG. 2, the sensor unit 220 includes at least one water quality sensor 221 that senses water quality information of groundwater mixed by the groundwater mixer 210. When the mixed water is produced by the groundwater mixer 210, the remote terminal 230 may instruct the water quality sensor 221 to sense the water quality (eg, salinity) information of the mixed water.

The water quality sensor 221 may sense the water quality information of the mixed water and provide the sensing result to the remote terminal 230. The water quality sensor 221 may measure the salinity of the mixed water using an electrical conductivity measurement method. In general, the electrical conductivity measurement method is used to measure salinity, which is the salinity of coastal groundwater, and the electrical conductivity increases in a certain proportion as the salinity increases, so it is frequently used for salinity measurement.

The sensor unit 220 may further include a temperature sensor 222. The temperature sensor 222 may measure the temperature of the groundwater or the mixed water at which the multilayer is formed. This is because the electrical conductivity of groundwater or mixed water changes depending on the water temperature of the groundwater or mixed water. Accordingly, the water quality sensor 221 and the temperature sensor 222 may sense the water quality information and the temperature at the same time or with a predetermined time difference.

When the ground water is mixed, the remote terminal 230 may determine whether the seawater infiltrates on the basis of the mixed ground water (hereinafter referred to as 'mixed water') and the water quality information and temperature information of the mixed water. Infiltration of seawater into groundwater increases the salinity as the thickness of the brine layer (i.e. the amount of brine) increases, and consequently the electrical conductivity. When the water quality information (that is, salinity) is changed compared to previously measured water quality information, the remote terminal 230 may know whether the seawater infiltration and the height change of the saltwater layer and the freshwater layer according to the infiltration of the seawater. To this end, the remote terminal 230 may include a storage unit 231, a database (DB) 232, a determination unit 233, and a display unit 234.

The storage unit 231 may store the water quality information of the mixed water sensed by the water quality sensor 221 of the sensor unit 220. In addition, the storage unit 231 may store temperature information of the mixed water sensed by the temperature sensor 222. The storage unit 231 may be a data logger that stores digital signals for water quality information and temperature information.

The DB 232 may map and store the reference water quality information of the mixed water and the thickness of at least one of the brine layer, the fresh water layer, and the transition layer of the ground water.

In detail, the DB 232 maps a first lookup table in which the reference water quality information sensed while adjusting the thicknesses of the saltwater layer, the freshwater layer, and the transition layer is mapped to the adjusted thicknesses of the saltwater layer, the freshwater layer, and the transition layer. Can be stored. The reference water quality information may be water quality information previously sensed by mixing groundwater whenever the thickness of the brine layer, the freshwater layer, and the transition layer is adjusted. That is, the designer may create a mixed water while changing the thickness of at least one of the saltwater layer, the transition layer, and the freshwater layer, and measure the water quality information of the mixed water to prepare a first lookup table as shown in [Table 1].

The reference water quality information stored in the first lookup table is reference data used by the seawater intrusion monitoring apparatus to determine whether seawater is infiltrated, and is information previously learned / investigated. Table 1 shows an example of the first lookup table. When the groundwater mixer 210 does not have the temperature sensor 222, the remote terminal 230 may determine whether seawater infiltrates using the first lookup table.

Standard water quality information of mixed water (E _cp ) Thickness of the brine layer
(L _s ) Thickness of the transition layer
(L _t ) Thickness of freshwater layer
(L _f ) E _cp1 L _s1 L _t1 L _f1 E _cp2 L _s2 L _t2 L _f2 E _cp3 L _s3 L _t3 L _f3 ... ... ... ...

Referring to [Table 1], E _cp refers to the groundwater mixer 210 when the saltwater layer, the transition layer, and the freshwater layer are L _s , L _t , and L _f , respectively. After mixing using the mixture to create a mixed water, the mixed water may be measured electrical conductivity. For example, E _cp1 is a mixture of the brine layer, the transition layer and the fresh water layer using the groundwater mixer 210 when the thickness of the brine layer, the transition layer and the freshwater layer is L _s1 , L _t1 , and L _f1 , respectively. It is the electrical conductivity of the mixed water measured after. Alternatively, E _cp may be an average value of water quality information measured in each of the brine layer, the transition layer, and the freshwater layer when the thickness of the saltwater layer, the transition layer, and the freshwater layer is L _s , L _t , and L _f , respectively.

Alternatively, the DB 232 maps the reference water quality information sensed while adjusting the thickness of the saltwater layer, the freshwater layer, and the transition layer in advance by the adjusted thicknesses of the saltwater layer, the freshwater layer, and the transition layer, and the reference water quality information is sensed. The second lookup table that further maps the temperature of the viewpoint may be stored. This is because the reference water quality information may change depending on the temperature of the groundwater. Table 2 shows an example of the second lookup table. When the ground water mixer 210 is provided with a temperature sensor 222 to sense the temperature of the ground water, the remote terminal 230 may determine whether seawater infiltrates using the second lookup table. In addition, when the water level in the observation well 10 does not change even when seawater is infiltrated, the remote terminal 230 may determine whether seawater has infiltrated using the first lookup table or the second lookup table.

Temperature (T) Standard water quality information of mixed water (E _cp ) Thickness of the brine layer
(L _s ) Thickness of the transition layer
(L _t ) Thickness of freshwater layer
(L _f )
T1≤T <T2
E _cp11 L _s11 L _t11 L _f11 E _cp12 L _s12 L _t12 L _f12 E _cp13 L _s13 L _t13 L _f13 ... ... ... ...
T2≤T <T3

E _cp21 L _s21 L _t21 L _f21 E _cp22 L _s22 L _t22 L _f22 E _cp23 L _s23 L _t23 L _f23 ... ... ... ...
T3≤T <T4

E _cp31 L _s31 L _t31 L _f31 E _cp32 L _s32 L _t32 L _f32 E _cp33 L _s33 L _t33 L _f33 ... ... ... ... ... ... ... ... ...

Referring to Table 2, T is the temperature of the groundwater, E _cp11 is the thickness of the saltwater layer, transition layer and freshwater layer L _s11 , L _t11 , and L _f11 , respectively, and the temperature of the ground water is between T1 and T2 The electrical conductivity of mixed water mixed with salt, brine, transition and fresh water layers.

Alternatively, the DB 232 may include a third lookup table that maps previously sensed reference water quality information to the adjusted thickness of the saltwater layer, the freshwater layer, and the transition layer, the temperature at the sensed time point, and the total volume of groundwater at the sensed time point. Can be stored. This is because the reference water quality information may change depending on the groundwater temperature as well as the total volume of the groundwater. Table 3 shows an example of the third lookup table. When the seawater penetrates and the water level in the observation well 10 changes, the remote terminal 230 may determine whether seawater has infiltrated using the third lookup table.

underground water
Volume (V) Temperature (T) Standard water quality information of mixed water (E _cp ) Saline
Thickness (L _s ) Transitional
Thickness (L _t ) Freshwater
Thickness (L _f )






V1






T1≤T <T2
E _cp11 L _s11 L _t11 L _f11 E _cp12 L _s12 L _t12 L _f12 E _cp13 L _s13 L _t13 L _f13 ... ... ... ...

T2≤T <T3
E _cp21 L _s21 L _t21 L _f21 E _cp22 L _s22 L _t22 L _f22 E _cp23 L _s23 L _t23 L _f23 ... ... ... ...

T3≤T <T4
E _cp31 L _s31 L _t31 L _f31 E _cp32 L _s32 L _t32 L _f32 E _cp33 L _s33 L _t33 L _f33 ... ... ... ... ... ... ... ... ...





V2







T1≤T <T2
E _cp41 L _s41 L _t41 L _f41 E _cp42 L _s42 L _t42 L _f42 E _cp43 L _s43 L _t43 L _f43 ... ... ... ...

T2≤T <T3 E _cp51 L _s51 L _t51 L _f51 E _cp52 L _s52 L _t52 L _f52 E _cp53 L _s53 L _t53 L _f53 ... ... ... ...

T3≤T <T4 E _cp61 L _s61 L _t61 L _f61 E _cp62 L _s62 L _t62 L _f62 E _cp63 L _s63 L _t63 L _f63 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...

Referring to [Table 3], V is the total volume of the mixed water at the time the basic water quality information is sensed, E _cp11 is the thickness of the salt layer, transition layer and fresh water layer L _s11 , L _t11 , and L _f11 , respectively. If the temperature of the ground water is between T1 and T2, and the total volume of the mixed water (or ground water) is V1, it is the electrical conductivity of the mixed water. The total volume V can be known from the water level sensed by the sensor 214. For example, since the initial water level and the initial volume of the groundwater are known, the changed total volume V can be obtained by comparing the thickness information sensed by the sensor 214 with the initial water level and the initial volume.

The determination unit 233 may determine whether seawater has penetrated by referring to the water quality information sensed by the sensor unit 220 and the reference water quality information stored in the DB 232.

In detail, the determination unit 233 may check the reference water quality information corresponding to the water quality information currently sensed by the sensor unit 220 from the DB 232. When all of the first to third lookup tables are stored in the DB 232, the determination unit 233 may use any one lookup table set to be used among the first to third lookup tables. For example, when the second lookup table is set to be used, the determination unit 233 may determine reference water quality information most similar to the currently sensed water quality information when the same reference water quality information as the currently sensed water quality information does not exist in the second lookup table. It can be confirmed from the second lookup table. The determination unit 233 may determine, from the second lookup table, the thickness of at least one of the saltwater layer, the freshwater layer, and the transition zone mapped to the identified reference water quality information. When the reference water quality information determined by the determination unit 233 is E _cp11 , the thicknesses of the saltwater layer, the freshwater layer, and the transition zone are L _s11 , L _t11, and L _f11, respectively.

On the other hand, if there is no reference water quality information identical to the currently sensed water quality information in the second lookup table, the determination unit 233 checks whether there is the same reference water quality information from the first and third lookup tables, and if not, the second lookup table. You can also find the most similar standard water quality information at.

The determination unit 233 may determine the penetration of seawater by comparing the thicknesses of the currently identified saltwater layer, the freshwater layer, and the transition layer with the thicknesses of the saltwater layer, the freshwater layer, and the transition zone. For example, if the currently identified saltwater layer is higher than the previously identified saltwater layer, the determination unit 233 may determine that the seawater has penetrated into the observation well 10. Or, if the heights of the entire identified saltwater, freshwater and transition layers and the heights of the previously identified saltwater, freshwater and transition layers are the same, determine if the currently identified salinity is higher than the previously identified salinity The unit 233 may determine that seawater has penetrated into the observation well 10.

The storage unit 231 may accumulate and store the thickness, sensed water quality information, and temperature information of each of the saltwater layer, the freshwater layer, and the transition table identified by the determination unit 233. Thus, the manager can easily grasp the history of changes in the thickness of each of the saltwater, freshwater and transition zones.

The display unit 234 shows the result determined by the determination unit 233 so that the manager can monitor the seawater infiltration result in the field.

4 is a view showing a seawater penetration monitoring apparatus according to another embodiment of the present invention.

Referring to FIG. 4, the seawater penetration monitoring apparatus includes a groundwater mixer 210, a sensor unit 220, a remote terminal 240, and a central controller 400. The groundwater mixer 210 and the sensor unit 220 shown in FIG. 4 perform the same functions as the groundwater mixer 210 and the sensor unit 220 shown in FIG. Since it is described with reference to 2, it is omitted.

The groundwater mixer 210 may include an air pump 211, an diffuser 212, and a nozzle 213, and the nozzle 213 may have a shape described with reference to FIG. 3A or 3B.

The sensor unit 220 may include a water quality sensor for sensing the water quality information of the mixed water in which the brine layer, the transition layer, and the fresh water layer of the ground water are mixed, and the temperature sensor 222 for sensing the temperature of the mixed water.

When the groundwater is changed into the mixed water, the remote terminal 230 stores the water quality information of the mixed water sensed by the water quality sensor 221 and the temperature information sensed by the temperature sensor 222, and centralizes the stored water quality information and the temperature information. It may transmit to the control device 400. To this end, the remote terminal 240 may include a storage unit 241, a control unit 242 and a communication unit 243.

The storage unit 241 transmits at least one of water quality information of the mixed water sensed by the sensor unit 220, temperature information, and thickness information sensed by the sensor 214 to the remote terminal 240 and the central controller 400. You can save according to the case set in. The storage unit 241 may be a data logger that stores digital signals for water quality information, temperature information, or volume information.

In detail, the first case assumes that the groundwater level does not change even when seawater infiltrates, and the central controller 400 determines whether seawater infiltrates in consideration of the water quality information of the mixed water. In the case of the first case, the storage unit 241 may store the water quality information of the mixed water sensed by the water quality sensor 221 of the sensor unit 220.

In addition, the second case is a case in which the groundwater level does not change even if seawater infiltrates, and the central control unit 400 determines whether seawater infiltrates in consideration of water quality information and temperature information of the mixed water. In the case of the second case, the storage unit 241 may store the water quality information of the mixed water sensed by the water quality sensor 221 and the temperature information of the mixed water sensed by the temperature sensor 222.

In addition, the third case is a case in which the groundwater level is changed by the infiltration of seawater, and the central control unit 400 determines whether the seawater infiltrates in consideration of water quality information and temperature information of the mixed water. In the case of the third case, the storage unit 241 is the water quality information of the mixed water sensed by the water quality sensor 221, the temperature information of the mixed water sensed by the temperature sensor 222 and the sensor 214 Information about the total volume of the mixed water can be stored.

The controller 242 may control the communication unit 243 to transmit at least one of water quality information, temperature information, and volume information stored in the storage unit 241 to the central controller 400. That is, when the first case is set, the control unit 242 transmits the water quality information, when the second case is set, the control unit 242 transmits the water quality information and the temperature information, and when the third case is set, the control unit 242 The water quality information, the temperature information and the thickness information can be transmitted.

The communication unit 243 may communicate with the central control unit 400 by a wireless communication method or by wire such as a coaxial cable.

The central control unit 400 may determine whether seawater penetrates based on data provided from the remote terminal 240, that is, water quality information. When the temperature information is also provided from the remote terminal 240, the central controller 400 may further determine the infiltration of seawater by further considering the temperature of the mixed water. To this end, the central control unit 400 may include a communication unit 410, a DB 420, a determination unit 430, a memory 440, and a display unit 450.

The communication unit 410 may communicate with the remote terminal 240 by a wireless communication method or by wire such as a coaxial cable. The communication unit 410 may receive at least one of water quality information, temperature information, and volume information of the mixed water from the remote terminal 240. Hereinafter, a case in which the second case is set in the remote terminal 240 and the central controller 400 will be described as an example. Therefore, the communication unit 410 receives the water quality information and the temperature information of the mixed water from the remote terminal 240 and outputs it to the determination unit 430.

The DB 420 may store at least one of the first to third lookup tables described with reference to FIG. 2. Since information stored in the first to third lookup tables has been described with reference to [Table 1] to [Table 3], a detailed description thereof will be omitted.

The determination unit 430 may check the water quality information of the mixed water input from the communication unit 410 and the reference water quality information corresponding to the temperature information from the second lookup table. The determination unit 430 may check the thicknesses of the saltwater layer, the freshwater layer, and the transition table mapped to the identified reference water quality information from the second lookup table. For example, when it is confirmed that the water quality information of the mixed water is the same as or most similar to E _cp11 of the second lookup table, the determination unit 430 determines the thickness of the saltwater layer, the fresh water layer, and the transition table stored in the E _cp11 phosphorus. Check from the lookup table. Therefore, the thicknesses of the identified brine layer, fresh water layer and transition layer are L _s11 , L _t11 and L _f11, respectively. Since the detailed operation of the determination unit 430 is the same as the determination unit 233 described with reference to FIG. 2, a detailed description thereof will be omitted.

The determination unit 430 may determine the penetration of seawater by comparing the thicknesses of the identified saltwater layer, the freshwater layer, and the transition layer, and the thicknesses of the saltwater layer, the freshwater layer, and the transition zone, respectively. For example, if the currently identified saltwater layer is higher than the previously identified saltwater layer, the determination unit 233 may determine that the seawater has penetrated into the observation well 10.

The memory 440 may accumulate and store the thicknesses of the saltwater layer, the freshwater layer, and the transition zones identified by the determination unit 430, and the water quality information and the temperature information received from the remote terminal 240. Accordingly, since the previously identified thicknesses of the saltwater layer, the freshwater layer, and the transition zone are sequentially stored in the memory 440, the administrator may easily grasp the history of the thickness change of the saltwater layer, the freshwater layer, and the transition zone. .

The display unit 450 is a monitor that shows the result determined by the determination unit 233 to the administrator.

5 is a view for explaining the case where the water level of the groundwater does not change.

In FIG. 5, 't1' represents a time point before seawater penetrates into the observation well 10, and 't2' represents a time point after seawater penetrates into the observation well 10. Comparing the thickness (L _s1) to the thickness (L _s2) of the brine layer (S2) at t2 in the brine layer (S1) at t1, brine layer by the penetration of water becomes deeper at t2. In addition, when comparing the thickness (L _f1) and the thickness (L _f2) of the fresh water layer (F2) at t2 in the fresh water layer (F1) at t1, hayeoteumeuro assumed that the ground water level change, brine by the infiltration of seawater Although the thickness L _s2 of the layer S2 increases, the thickness of the freshwater layer L _f2 decreases.

6 is a view for explaining the case where the water level of the groundwater is changed.

In FIG. 6, 't3' indicates a time point before seawater penetrates into the observation well 10, and 't4' indicates a time point after seawater penetrates into the observation well 10. Comparing the thickness (L _s3) to the thickness (L _s4) in the brine layer (S4) at t4 in the brine layer (S3) at t3, brine layer by the penetration of water becomes deeper at t4. In addition, when comparing the thickness (L _f3) and the thickness (L _f4) of the fresh water layer (F4) at t4 of fresh water layer (F3) at t3, hayeoteumeuro assumed that the ground water level change, the brine layer (S4) As the thickness increases, the thickness of the freshwater layer F4 also increases.

7 is a flowchart illustrating a seawater penetration monitoring method of the seawater penetration monitoring apparatus according to an embodiment of the present invention.

The seawater penetration monitoring method to be described with reference to FIG. 7 may be performed by the seawater penetration monitoring apparatus described with reference to FIG. 2 or 4.

 In operation S710, the seawater penetration monitoring apparatus may generate mixed water by mixing groundwater in the observation well. The seawater penetration monitoring apparatus may mix the brine layer, the transition layer, and the freshwater layer of the groundwater using the groundwater mixer as shown in FIG. 2. The groundwater mixer may move the air injected by the air pump to the nozzle in the groundwater through the diffuser, and discharge the air in the form of bubbles through the nozzle to mix the groundwater.

In operation S720, the seawater penetration monitoring device may sense the water quality information and the temperature of the mixed water. The water quality information may be, for example, an electrical conductivity representing the salinity of the mixed water.

In step S730, the seawater penetration monitoring device stores the water quality information and temperature information of the sensed mixed water.

In operation S740, the seawater penetration monitoring apparatus may check reference water quality information corresponding to the water quality information of the sensed or stored mixed water in the database. The database may store the water quality information of the mixed water previously learned / sensed for various thicknesses of the saltwater layer, the transition layer, and the freshwater layer. For example, data described with reference to [Table 1] to [Table 3] may be stored in a database.

In operation S750, the seawater penetration monitoring apparatus may check the thickness of the saltwater layer, the freshwater layer, and the transition zone mapped to the reference water quality information identified in operation S740 from the data surface.

In operation S760, the seawater penetration monitoring apparatus may determine the penetration of seawater by comparing the thicknesses of the saltwater layer, the freshwater layer, and the transition layer identified in operation S750 with the thicknesses of the saltwater layer, the freshwater layer, and the transition zone previously identified. . For example, if the currently identified saltwater layer is higher than the previously identified saltwater layer, the seawater penetration monitoring device may determine that the seawater has penetrated into the observation well.

In operation S770, the seawater penetration monitoring apparatus may process the determination result so that the administrator can easily identify the displayed result on the screen.

While the present invention has been described with reference to the particular embodiments and drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

210: groundwater mixer 211: air pump
212: diffuser 213: nozzle
220: sensor unit 221: water quality sensor
222: temperature sensor 230, 240: remote terminal
400: central control unit

Claims (16)

An groundwater mixer for mixing the groundwater present in the observation well;
A sensor unit including at least one sensor for sensing the water quality information of the ground water mixed by the ground water mixer; And
Determination unit for determining whether the infiltration of sea water based on the stored water quality information; Seawater penetration monitoring apparatus comprising a. The method of claim 1,
And a storage unit for storing the water quality information sensed by the sensor unit. The method of claim 2,
The storage unit is a seawater penetration monitoring device, characterized in that provided in the remote terminal (RTU: Remote Terminal Unit) for transmitting the stored water quality information to the central control unit. The method of claim 1,
And a database in which reference water quality information of mixed water, which is water quality information sensed by mixing the ground water in advance, and a thickness of at least one of the brine layer, the fresh water layer, and the transition layer of the ground water are mapped and stored.
The determination unit, the seawater penetration monitoring apparatus characterized in that it determines whether the seawater infiltrates by referring to the water quality information sensed by the sensor unit and the reference water quality information stored in the database. The method of claim 4, wherein
And the reference water quality information is mapped to and stored at a temperature at which the reference water quality information is sensed. The method of claim 5,
And the reference water quality information is mapped to and stored in the entire volume of the groundwater where the reference water quality information is sensed. The method of claim 1,
The sensor unit further comprises a temperature sensor for measuring the temperature of the groundwater seawater penetration monitoring device. The method of claim 1,
The groundwater mixer,
An air pump for injecting air from the ground;
An diffuser provided in the groundwater, the diffuser providing a movement path of the air injected by the air pump; And
And a nozzle provided in the lower layer of the groundwater and discharging air moving through the diffuser in the form of bubbles.
Air in the form of bubbles discharged from the nozzle is characterized in that the seawater penetration monitoring device. 9. The method of claim 8,
The groundwater mixer,
Seawater penetration monitoring device further comprises; a sensor for measuring the thickness of the ground water. Mixing groundwater in the observation well using a groundwater mixer;
Sensing water quality information of the mixed groundwater using at least one sensor; And
And storing the sensed water quality information. The method of claim 10,
Determining whether seawater infiltrates on the basis of the stored water quality information; Seawater penetration monitoring method further comprising. The method of claim 11,
The determining step,
Determining whether the seawater infiltrates by referring to the sensed and stored water quality information and the reference water quality information stored in the database,
The reference water quality information stored in the database is seawater penetration monitoring method, characterized in that the water quality information sensed by mixing the groundwater in advance. The method of claim 12,
The reference water quality information is also mapped to the temperature of the time when the reference water quality information is stored in the database, characterized in that stored in the database. The method of claim 13,
The reference water quality information is also mapped to the total volume of the groundwater sensed the reference water quality information is stored in the database, characterized in that stored in the database. The method of claim 10,
Measuring the temperature of the groundwater; Seawater penetration monitoring method further comprising. The method of claim 10,
Mixing the groundwater,
Sea water penetration monitoring method characterized in that the air injected by the air pump is moved to the nozzle in the groundwater through the diffuser, the air is discharged in the form of bubbles through the nozzle to mix the groundwater.

Images