Water level correction device, method, and program

Abstract

This system provides a water level correction system that is not limited by installation location and can calculate weather-corrected water level information from measured water level data. [Solution] This water level correction system comprises an information acquisition unit that acquires water level information measured by a water level sensor and weather data measured by a weather sensor; a judgment unit that identifies the start of flooding from flood judgment information; a storage unit that stores weather data at the start of flooding as initial information; and a calculation unit that uses the initial information to correct the water level information for weather conditions. This system enables accurate measurement by detecting flooding at the installation site and correcting the water level for weather conditions while the site is flooded.

Description

Technical Field

[0001] The present invention relates to a water level measuring device for real-time measurement of the flooding situation of buildings such as houses flooded by water disasters, and the waterlogging levels of underpasses, underground shopping arcades, etc., and a correction system therefor.

Background Art

[0002] In recent years, due to guerrilla heavy rain and typhoons, a large amount of rainwater that the drainage function cannot catch up with falls, so before external water flooding occurs, damage caused by internal water flooding such as flooding of buildings, underpasses, and underground shopping arcades has been reported. In particular, regarding the damage caused by waterlogging, since the ground is not waterlogged and it is thought that the underpasses and underground shopping arcades are not waterlogged, there are also secondary damages caused by entering, so there is a need for a water level measuring device that can be installed in places other than the waterside of rivers, etc. and can measure the water level in real time.

[0003] In addition, when a building such as a house suffers flood damage, the height of the flood water level may be used as a criterion for the magnitude of the damage. For example, an insurance company may calculate the amount of insurance money paid based on the height of the water level from the ground in a flooded building, and a method for accurately and quickly grasping the flood water level is desired.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0005] The water-sensing sensor described in Patent Document 1 uses a water battery capable of generating an electromotive force in reaction with water, and receives power from the water battery to output a water-sensing signal to the outside indicating that water has reached the sensor location. However, the water-sensing sensor only measures when the water level reaches the sensor location and cannot determine the actual water level. While it is possible to measure water levels in stages by arranging multiple water-sensing sensors, the measurement interval depends on the spacing between the water level sensors, and many water-sensing sensors are required when measuring water levels in increments of a few centimeters.

[0006] The flood level calculation system described in Patent Document 2 calculates the flood level from the floor by photographing the wall surface including the flood line and then analyzing the image data with a computer. However, in order to photograph the image data for analysis, workers need to go to the installation site which has been damaged by floods, and although the flood line is an indication that the water level was maintained at that level for a certain period of time, the peak water level may not be maintained until the time the flood line is etched, so there was a possibility of inaccuracies in the flood level calculation.

[0007] Furthermore, the aforementioned flood level calculation system calculates the flood level based on the height of a reference object. While it is possible to calculate the flood level by setting up a reference object in advance and observing it continuously with cameras, etc., if the reference object is knocked over or submerged in water due to flooding, it becomes impossible to measure the water level. Therefore, there was a major challenge in performing real-time water level measurement.

[0008] As a method for measuring water levels in real time and to within a few centimeters, pressure-type water level gauges are widely used for measuring water levels in rivers and other bodies of water. Patent document 3 describes a method for accurately measuring water levels using a pressure-type water level gauge that can perform atmospheric pressure correction using an atmospheric pressure release tube, and a method for accurately measuring water levels using an atmospheric pressure correction system with an inexpensive pressure-type water level gauge that does not have an atmospheric pressure release tube.

[0009] However, pressure-type water level gauges are susceptible to measurement errors due to the accumulation of dirt and sediment on the pressure-receiving surface. When intended for use on land, such as to measure the flooding status of buildings, dust and debris tend to accumulate on the pressure-receiving surface, potentially preventing accurate measurement of water levels during flooding. Furthermore, they require frequent maintenance, such as checking for the presence of accumulated debris, negating the advantage of pressure-type water level gauges, which are generally cheaper to install than other types of water level gauges.

[0010] As a countermeasure against the adhesion of dirt to the pressure-receiving surface, Patent Document 4 proposes a groundwater level gauge that has a measuring pipe with an open lower end and a measuring pressure sensor attached to the upper end of the measuring pipe in an airtight manner. However, this groundwater level gauge has the problem that it can only be used in environments where there is a constant water level, the inside of the pipe is sealed, and initial information inside the pipe can be determined, and it cannot be used in buildings or along roads where there is no constant water level and initial information inside the pipe cannot be determined. [Means for solving the problem]

[0011] The present invention provides a water level correction system that can obtain highly accurate water level information by acquiring water level information in real time, without being limited by installation location, and performing correction processing based on meteorological data.

[0012] In other words, the water level correction system according to the present invention is characterized by comprising: an information acquisition unit that acquires water level information measured by a water level sensor and meteorological data measured by a meteorological sensor; a first storage unit that stores flood judgment information which serves as a reference value for determining the start of flooding; a judgment unit that identifies the start of flooding from the flood judgment information; a second storage unit that stores meteorological data at the time of flooding onset as initial information; and a calculation unit that uses the initial information to correct the water level information for meteorological reasons.

[0013] The aforementioned initial information may include atmospheric pressure and / or temperature.

[0014] The water level measuring device comprises the water level correction system, a water level sensor that measures the water level and transmits the water level information to an information processing unit, a weather sensor that measures weather data, and the water level measuring system, wherein the water level sensor may have a transmission unit that transmits the water level information to the information processing unit, a determination unit that identifies the start of flooding from flooding determination information, and a control unit that changes the time interval for transmitting the water level information to the information processing unit when flooding is determined.

[0015] The water level measuring device according to the present invention includes a storage unit that identifies the start of flooding from flooding judgment information and stores meteorological data at the time of the flooding judgment as initial information, making it possible to accurately record the initial information inside the water level sensor. Furthermore, by installing the information processing device in a location different from the water level sensor and acquiring information via wireless communication, it becomes possible to obtain water level measurement data without workers having to go to the site affected by floods or other water-related disasters.

[0016] Furthermore, the inclusion of a judgment unit that identifies the start of flooding based on flood assessment information solves the problem with conventional pressure-type water level gauges, which cannot be installed in locations where there is not a certain amount of water to seal the cylindrical part in order to identify initial information for water level correction. This makes it possible to install the gauge in locations where there is no water level to measure at the installation stage, such as along buildings and roads.

[0017] By creating a water level correction program that enables a computer to function as a water level correction system, which performs information processing to acquire water level information measured by water level sensors and weather data measured by weather sensors, storage processing to store weather data for the time when flooding is determined as initial information, and calculation processing to correct the water level information for weather conditions using the aforementioned conditions, it becomes possible to check the flooding status of water level sensor installation locations anywhere in the country.

[0018] Further, the water level measuring device according to the present invention includes a water level sensor, a management unit that records and manages information transmitted from the water level sensor, and an external terminal that accesses the management unit and can confirm the information of the water level sensor. The water level sensor includes a weather sensor that acquires weather information around the water level sensor, a determination unit that determines flooding, a storage unit that stores various information such as a reference value for determining flooding and an initial value of the water level sensor, and a calculation unit that calculates a corrected water level using the information stored in the storage unit. It is characterized by this.

[0019] With the water level measuring device, it is possible to obtain a corrected water level that is meteorologically corrected only by the water level sensor, and if the external terminal is possessed, it is possible to confirm the flooding situation at the installation position of the water level sensor anywhere in the country.

Brief Description of Drawings

[0020] [Figure 1] It is a diagram showing an embodiment of the water level measuring device according to the present invention. [Figure 2] (a) A front view showing an embodiment of the water level sensor in FIG. 1, (b) A longitudinal sectional view of the connecting portion between the cylindrical portion and the main body portion is shown respectively. [Figure 3] It is a flowchart showing an example of the processing procedure of the water level sensor. [Figure 4] It is a flowchart showing an example of the processing procedure of the information processing device. [Figure 5] It is a diagram showing a second embodiment of the water level measuring device according to the present invention. [Figure 6] It is a flowchart showing an example of the processing procedure of the water level sensor in the second embodiment.

Mode for Carrying Out the Invention

[0021] Regarding the embodiment of the present invention, water level information is acquired from a water level sensor installed at an arbitrary position, and meteorological correction of the water level information is performed using the current meteorological data and the meteorological data when a certain water level is detected.

[0022] The embodiment of the present invention will be specifically described based on the drawings. Figure 1 shows an embodiment of the water level measuring device according to the present invention. The water level measuring device 1 can be installed at any location, such as along the exterior wall of a building such as a house, and consists of a water level sensor 2 that measures the water level at the installation location, an information processing device 4 that receives and manages data from the water level sensor 2, and a weather sensor 3 that provides the information processing device with weather data for the area where the water level sensor is installed. The water level sensor 2 also includes a first storage unit 6 that stores flood judgment information and a judgment unit 7 that identifies the start of flooding using the flood judgment information, and the information processing device 4 includes an information acquisition unit 5 that acquires information from the water level sensor 2 and the weather sensor 3, a second storage unit 8 that stores weather information at the start of flooding as initial information, and a measurement unit 9 that corrects the water level information acquired from the water level sensor 2 using the initial information.

[0023] In the aforementioned water level measuring device 1, the water level sensor 2 and the weather sensor 3 are separate, but the weather sensor 3 may be integrated into the water level sensor 2. Furthermore, the method of acquiring weather data is not limited to the weather sensor 3; weather data may be acquired from a weather observation system such as AMeDAS without installing the weather sensor 3.

[0024] Figure 2(a) shows one embodiment of the water level sensor 2. The water level sensor 2 comprises a rectangular box-shaped main body 21 and a cylindrical part 22, with the cylindrical part 22 attached to the lower part of the main body 21, with its longitudinal direction oriented vertically. Specifically, a joint 211 is provided at the lower part of the main body 21, and the upper end of the cylindrical part 22 is joined to this joint 211, thereby integrally forming the main body and the cylindrical part.

[0025] The cylindrical portion 22 is formed by a joint 211, an upper pipe member 221A, a lower pipe 221B, and a pipe joint 211, and the inside of the cylindrical portion 22 has a hollow portion 212 that penetrates from the lower end of the pipe to the joint.

[0026] In this embodiment, the upper pipe member 221A and the lower pipe 221B are joined by a pipe joint 223 to form a single cylindrical portion 22. However, the cylindrical portion 22 may be formed using a single pipe, or it may be formed by joining three or more pipes with a pipe joint 223.

[0027] The material and shape of the cylindrical portion 22 are not limited, but in this embodiment it is a long cylindrical body made of synthetic resin, and is made of ASA resin. The cylindrical portion 22 is made of a round pipe with an outer diameter of 30 mm, and the upper pipe 221A and the lower pipe 221B are joined by a pipe joint 223 to form a cylindrical body with a length of 3.0 m in the vertical longitudinal direction. The lower part of the cylindrical portion 22 is configured to have multiple small openings rather than a large opening corresponding to the inner diameter of the cylindrical portion 22, and is equipped with a mesh cap 222 that has a filter to prevent debris from entering the inside of the cylinder when it is submerged in water, etc.

[0028] The material and shape of the mesh cap 222 are not limited, but in this embodiment, it is a bottomed cylindrical cap made of synthetic resin, and like the cylindrical part 22, it is made of ASA resin. A groove is formed on the opening side into which the cylindrical part 22 can be inserted, and multiple holes are formed in a grid pattern on the top plate that forms the bottom, preventing foreign matter from entering the hollow part 212 and reducing fluctuations in air pressure inside the hollow part 212 due to changes in the flow of water that immerses the cylindrical part 22. The water level sensor 2 is configured to measure only static pressure due to the immersion water level because the cylindrical part 22 is positioned perpendicular to the flow of water. However, in a real-world environment, unlike rivers, the flow of water may change due to buildings such as houses, and dynamic pressure may be applied to the water level sensor. By attaching the mesh cap 222, it is possible to obstruct the flow of water in the direction of dynamic pressure to the cylindrical part 22 and reduce the influence of dynamic pressure. Furthermore, even if the mesh cap 222 becomes blocked or damaged by foreign matter, the mesh cap 222 can be separated from the cylindrical part 22, resulting in high maintainability.

[0029] Figure 2(b) is a longitudinal cross-sectional view of the upper part of the cylindrical section 22 and the joint 211. The main body section 21 is omitted from the longitudinal cross-sectional view in Figure 2(b). The joint 211 is formed as a bottomed cylindrical shape with an open bottom and a closed top, and the gauge pressure sensor 26 is attached so as to penetrate the top plate 211A that forms the bottom of the joint 211.

[0030] The joint 211, the gauge pressure sensor 26, and the cylindrical portion 22 are fixed together without gaps by adhesive bonding, forming a bottomed cylindrical shape. This allows the pressure changes in the hollow portion 212 caused by water pressure from flooding to be measured at the pressure-receiving surface of the gauge pressure sensor 26 without escaping to the outside of the cylinder, thereby reducing measurement errors. The method of fixing the gauge pressure sensor 26 is not limited to adhesive bonding; welding or fitting methods may also be used as long as they can be fixed without gaps.

[0031] Furthermore, although the gauge pressure sensor 26 is mounted so as to penetrate the top plate 221A, the mounting position is not limited as long as it can measure the air pressure inside the hollow section 212, and the gauge pressure sensor 26 may also be mounted inside the main body 21 and connected with a tube or the like.

[0032] In this embodiment, the gauge pressure sensor 26 uses a piezoresistive pressure sensor. The change in resistance due to gauge pressure is output as a change in voltage when current is applied, and the measured voltage value is converted into a measured water level and recorded by the control unit 25. The sensor used for the gauge pressure sensor 26 is not limited to a piezoresistive pressure sensor; other measurement methods such as resistive film methods like metal resistance or ceramic resistance, as well as capacitive or piezoelectric elements, may also be used. Sensors that measure absolute pressure or differential pressure in addition to gauge pressure may also be used.

[0033] The main unit 21 houses a communication unit 23, a power supply 24, and a control unit 25 inside. The control unit 25 receives power from the power supply 24, which is a lithium-ion battery that serves as a primary battery, and controls the communication unit 23 and the gauge pressure sensor 26. The control unit 25 also includes a first storage unit 6 for storing flood detection information and a determination unit 7 for determining the start of flooding based on the flood detection information.

[0034] The control unit 25 records the voltage of the gauge pressure sensor 26 at the start of measurement as a reference voltage in the first storage unit 6, measures the voltage of the gauge pressure sensor 26 at regular intervals, compares it with the reference voltage in the judgment unit 7, and determines that there is flooding if the voltage difference is greater than or equal to the voltage difference recorded as flooding judgment information in the first storage unit 6. Specifically, the voltage of the gauge pressure sensor 26 is measured every 5 minutes, and the judgment unit 7 makes a flooding judgment.

[0035] When the measured voltage detects a voltage difference greater than or equal to the flooding judgment information stored in the first memory unit compared to the reference voltage, the judgment unit 7 determines that flooding has begun, and the water level sensor 2 transmits the current water level information and an instruction to start measurement to the information processing unit 4. At the same time, the control unit 25 sets the interval for transmitting water level information to the information processing unit 4. Specifically, the control is changed to transmit water level information to the information processing unit 4 at 5-minute intervals. The interval that the control unit 25 changes in response to the start of flooding is not limited to the interval for transmitting water level information to the information processing unit 4; the interval at which the water level sensor 2 measures the water level may also be changed, and parameters to be changed may be selected according to the environment, such as the installation location.

[0036] The judgment unit 7 makes it possible to identify the timing when the cylindrical part 22 becomes sealed due to flooding. This solves the problem that previously it was not possible to identify initial information in areas such as buildings and roadsides where there is no constant water level. By measuring the flood level of inland flooding occurring on land using a pressure-type water level gauge and correcting the measurement data for weather conditions, it has become possible to measure water levels in real time down to a few centimeters.

[0037] The communication unit 23 is equipped with a transmitting antenna 231 that protrudes upward from the top of the main unit 2, and is configured to transmit measured water level information to the information processing device 4 via wireless signal from this transmitting antenna 231. Under normal circumstances, the control unit 23 controls the communication unit 23 to transmit a signal to the information processing device 4 once a day, regardless of whether water level measurement has started or not, to indicate that the water level sensor 2 is operational. In the event of flooding, the transmission cycle of the wireless signal is shortened compared to normal conditions, and the water level information is transmitted to the information processing device 4 once every 5 minutes.

[0038] The aforementioned communication unit 23 is formed using LPWA (Low Power Wide Area), specifically using Sigfox®. Water level measurement reduces power consumption by utilizing LPWA in the communication unit 23. The wireless communication used in the communication unit 23 is not limited to LPWA; wireless communication such as 3G, 4G, LTE, and 5G may also be used.

[0039] In this embodiment, the flooding judgment information is the voltage difference between the measured voltage and the reference voltage. However, the flooding judgment information is not limited to any information that can determine flooding. It may also include water level information measured by the water level sensor 2, weather data such as rainfall over a certain period measured by the weather sensor 3 with an information acquisition unit 4 attached to the water level sensor 2, or electrical signals from flood sensors attached to the lower end of the cylindrical part 22 near the ground or to the mesh cap 222, and used as flooding judgment information.

[0040] Figure 3 shows a flowchart of an example of the processing procedure for the water level sensor 2 in this embodiment. The gauge pressure sensor 26 measures voltage at 5-minute intervals, and the determination unit 7 compares it with a reference voltage. If the voltage difference is greater than or equal to the voltage difference stored in the first memory unit, it is determined that there is flooding. Even if the determination unit 7 does not determine that there is flooding, the water level sensor 2 sends a signal to the information processing device 4 once a day to confirm the connection with the information processing device 4.

[0041] When the measured voltage is detected to be higher than the reference voltage, the judgment unit 7 determines that there is flooding, and the water level sensor 2 starts measuring the water level. The voltage value measured by the water level sensor 2, along with water level information such as the water level corresponding to the measured voltage and gauge pressure, is transmitted from the antenna unit 23 to the information processing device 4 along with a signal to start water level measurement. The control unit 25 changes the transmission time of the water level information to a 5-minute interval. This reduces power consumption when there is no flooding damage, and enables real-time measurement when flooding occurs.

[0042] The water level sensor 2 continues measuring the water level and transmitting water level information to the information processing device 4 until the voltage value of the gauge pressure sensor 26 falls below the termination voltage determined by the flood judgment information stored in the first memory unit 6, and the judgment unit 7 determines that the measurement is complete. When it is determined that the measurement is complete, it transmits a measurement completion message to the information processing device 4 and terminates the water level measurement.

[0043] Pressure-type water level gauges, which measure water level by changing the internal pressure of a cylinder due to water pressure, are known to require weather correction when continuously measuring water level because errors occur in the measured water level due to the difference between the air pressure of the air sealed inside the cylinder and the constantly changing atmospheric pressure around the water level gauge, as well as changes in ambient temperature. Conventional pressure-type water level gauges can be installed only in environments with a constant water level that allows the inside of the cylinder to be constantly sealed, so weather data at the time of installation can be used. However, in buildings or along roads where there is no constant water level, it is not possible to identify the weather data at the time when the inside of the cylinder is sealed by flooding, which presents a problem in that installation is not possible. In the present invention, the water level sensor 2 is equipped with a control unit 25, and the judgment unit 7 of the control unit 25 can determine the start / end of flooding using flood judgment information stored in the first storage unit 6. This configuration makes it possible to identify the weather data at the time the inside of the cylinder is sealed and to identify the initial information inside the cylinder.

[0044] Figure 4 shows a flowchart of an example of the processing procedure of the information processing device 4 in this embodiment. When the information acquisition unit 5 receives water level information from the water level sensor 2, it is assumed that water level measurement has started, and weather data is acquired from the weather sensor 3 and recorded in the second storage unit 8 as initial information. In this embodiment, atmospheric pressure and / or temperature are recorded as weather data, but the number of weather data items to be acquired may be increased as needed. Each time water level information is received from the water level sensor 2, weather data is acquired from the weather sensor 3, and the calculation unit 9 performs water level correction processing using the initial information, water level information, and weather data. The corrected water level and each data are combined and recorded in the second storage unit 8. When a measurement completion signal is received from the water level sensor 2, the water level correction processing is terminated, and the retention of initial information is terminated.

[0045] The weather sensor 3 continuously measures weather data and sends a signal once a day to confirm its connection with the information processing device 4. When a weather data transmission signal is received from the water level sensor 2 or the information processing device 4, the weather data at the reception stage is sent to the information processing device 4. Subsequently, weather data is transmitted for each weather data transmission signal. This allows for real-time measurement when flooding occurs while minimizing power consumption in situations without flood damage.

[0046] The flood detection process, which involves comparing the measured voltage of the gauge pressure sensor 26 with the reference voltage, is not performed while water level measurement is in progress and is resumed upon completion of water level measurement. While flood detection is in progress, water level information is not transmitted. Upon re-determination of flood detection, the water level information is transmitted to the information processing device 4. Therefore, upon receipt of the water level information, the acquisition of initial information and water level correction processing begin. This allows for the identification of initial information and accurate measurement of the corrected water level, even if the cylindrical section 22 repeatedly opens and closes due to flooding.

[0047] Figure 5 shows a second embodiment of the present invention. The water level measuring device 1 can be installed at any location, such as along the exterior wall of a building such as a house, and consists of a water level sensor 2 that measures the water level at the installation location, a management unit 10 that receives and manages data from the water level sensor 2, and an external terminal 11 that can access the management unit and display the measurement data recorded in the management unit. The water level sensor 2 includes a first storage unit 6 that stores flood judgment information and weather information at the start of flooding as initial information, a judgment unit 7 that identifies the start of flooding using the flood judgment information, a weather sensor 3 that acquires weather information around the water level sensor 2, and a measurement unit 9 that corrects the water level information measured by the water level sensor 2 for weather conditions.

[0048] The management unit 10 includes an information acquisition unit 5 that acquires information from the water level sensor 2, and a second storage unit 8 that records the acquired information. The management unit 10 is not limited in its placement location as long as it can acquire information from the water level sensor 2, and may be placed at a location away from the water level sensor 2.

[0049] The external terminal 11 accesses the management unit 10 and is equipped with a display unit 12 that displays information recorded in the second storage unit 8. As long as there is an environment that can access the management unit 10, the measurement information from the water level sensor 2 can be checked from any location. This makes it possible to check the flood situation even from a location far from where the water level sensor 2 is installed.

[0050] Although the external terminal 11 accesses the management unit 10 to check measurement information, the management unit 10 may also send information to the external terminal 11. Specifically, when the management unit 10 receives flood information from the water level sensor 2, it sends a flood alert to the external terminal 11. When the external terminal 11 receives the flood alert, it performs actions to notify those outside the external terminal 11 of the flood, such as displaying a flood notification on the display unit or sounding an alert. This makes it possible to inform the owner of the external terminal 11 and those in the surrounding area where the external terminal 11 is installed of the flood, prompting evacuation or restricting movement to the flooded area.

[0051] Figure 6 shows an example of the processing procedure for the water level sensor 2 in the second embodiment. In this embodiment as well, the water level sensor 2 described in Figure 2 is used, and the control unit 25 is equipped with a weather sensor 3, a first storage unit 6, a judgment unit 7, and a calculation unit 9. As a result, weather information can be acquired within the water level sensor 2, and weather correction can also be performed, eliminating communication time lag and enabling more accurate measurements.

[0052] The gauge pressure sensor 26 measures the gauge pressure (voltage) at 5-minute intervals, and the judgment unit 7 compares it with a reference voltage. If the voltage difference is greater than or equal to the voltage difference stored in the first memory unit 6, it determines that there is flooding. Even if the judgment unit 7 does not determine that there is flooding, the water level sensor 2 transmits to the management unit 10 once a day, including a connection check, that no flooding has occurred.

[0053] Although the information to be transmitted to the management unit 10 is not particularly limited, it is preferable to transmit the measured water level after performing water level correction in order to confirm the operation of the control unit 25 of the water level sensor 2.

[0054] When the judgment unit 7 determines that flooding has occurred, the weather sensor 3 acquires weather information, which is stored as an initial value in the first storage unit 6 along with the reference voltage. The control unit 25 also sets the interval for transmitting water level information to the management unit 10. Specifically, the control is changed to transmit water level information to the management unit 10 at 5-minute intervals, and the calculation unit 9 starts the water level correction process based on weather correction.

[0055] The gauge pressure sensor 26 measures the gauge pressure, and the weather sensor 3 acquires weather information. The calculation unit 9 uses the initial value stored in the first storage unit 6, the gauge pressure, and the weather information to perform water level correction processing and calculate the corrected water level.

[0056] The calculated corrected water level is transmitted to the control unit 10, and it is determined whether the gauge pressure is below the termination voltage that indicates the end of flooding. If flooding is continuing, the water level correction process is continued.

[0057] When it is determined that the flooding has ended, the water level correction process is terminated, the initial values ​​stored in the first memory unit 6 are deleted, and the control unit 25 sets the transmission interval. Specifically, the control is changed so that water level information is transmitted to the management unit 10 once a day, and flooding determination by gauge pressure measurement is performed at 5-minute intervals.

[0058] After the transmission interval is changed by the control unit 25, the water ingress detection by the gauge pressure sensor 26 continues, and water level measurement continues until the water level sensor 2 is damaged or removed.

[0059] In this embodiment, the initial value is stored in the first storage unit 6 after it is determined that flooding has occurred. However, regardless of whether or not there is flooding, the values ​​measured by the gauge pressure sensor 26 and the weather sensor 3 at regular intervals may be stored as the initial value. This initial value can then be used to perform water level correction processing, and the corrected water level may be transmitted when the connection with the management unit 10 is confirmed once a day.

[0060] In this embodiment, the information processing device 4 is equipped with an information acquisition unit 5, a second storage unit 8, and a calculation unit 9 to perform water level correction processing. However, the placement is not limited. Alternatively, the water level sensor 2 may be equipped with a calculation unit 9 that corrects the measured water level for weather conditions, and an information acquisition unit 5 that acquires weather data from a weather sensor 3. The first storage unit 6 stores the weather data at the start of flooding, which is the role of the second storage unit 8. The water level correction processing is performed within the water level sensor 2, and the corrected water level is transmitted to the information processing device 4. The information processing device 4 then stores the received information in the second storage unit. In any case, as long as the information acquisition unit 5, the first storage unit 6, the second storage unit 8, the judgment unit 7, and the calculation unit 9 are connected within the system by wireless communication or the like, they may be placed in any location and each unit may delegate its role.

[0061] Furthermore, the system may also be configured as a water level correction program that enables a computer to function as a water level correction system, performing information processing to acquire water level information measured by a water level sensor and weather data measured by a weather sensor, storage processing to store weather data for the time when flooding was determined as initial information, and calculation processing to correct the water level information for weather conditions using the aforementioned conditions. [Explanation of Symbols]

[0062] 1. Water level measuring device 2. Water level sensor 21 Main body 22 Cylindrical part 221 pipe 222 Mesh Cap 223 Pipe joint 23 Communications Department 24 Power supply 25 Control Unit 26 Gauge pressure sensor 3 Weather sensors 4. Information Processing Device 5 Information acquisition department 6. First Memory Unit 7 Judgment section 8. Second memory unit 9 Calculation section 10 Management Department 11 External terminals 12 Display section

Claims

1. A water level correction system comprising: an information acquisition unit that acquires water level information measured by a water level sensor and weather data measured by a weather sensor; a first storage unit that stores flood judgment information which serves as a reference value for determining the start of flooding; a judgment unit that identifies the start of flooding from the flood judgment information; a second storage unit that stores weather data at the time of flooding onset as initial information; and a calculation unit that corrects the water level information for weather conditions using the initial information.

2. The water level correction system according to claim 1, wherein the initial information includes atmospheric pressure and / or temperature.

3. A water level measuring device comprising a water level correction system according to claim 1 or 2, and a water level sensor that measures the water level and transmits the water level information to an information processing unit.

4. The water level measuring device according to claim 3 is characterized in that the water level sensor has a first storage unit that stores flood judgment information which serves as a reference value for determining the start of flooding, and a control unit that sets a time interval for transmitting water level information to an information processing unit when it is determined that flooding has started.

5. The water level measuring device according to claim 3, characterized in that the water level sensor is installed on land.

6. A water level correction program that enables a computer to function as a water level correction system, performing information acquisition processing to acquire water level information measured by a water level sensor and weather data measured by a weather sensor; judgment processing to identify the start of flooding from flood judgment information; storage processing to store weather data at the start of flooding as initial information; and calculation processing to correct the water level information for weather using the initial information.

7. A water level correction method that uses water level information measured by a water level sensor, weather data measured by a weather sensor, and weather data at the start of flooding to correct the water level information measured by the water level sensor for weather conditions.

8. Water level sensor, A management unit that records and manages the information transmitted from the water level sensor, The system includes an external terminal that can access the aforementioned management unit and check the water level sensor information, The water level sensor includes a weather sensor that acquires weather information around the water level sensor, A judgment unit for determining flooding, A memory unit that stores various information such as the reference value for determining flooding and the initial value of the water level sensor, A calculation unit that uses the information stored in the memory unit to calculate the corrected water level, A water level measuring device equipped with the following features.

Images