JP3871218B2 - Paddy field water management system - Google Patents

Description

The present invention, in the paddy field area composed of a plurality of paddy, efficient irrigation, in order to reduce the cost, the water supply valve operated by remote automatic operation, water pumps operating, other paddy for performing water management tasks in charge of water management systems, especially in large paddy areas with many paddy fields in the same area, it relates to a preferred paddy water management system with respect to cold regions of paddy.

  Conventionally, in paddy fields where water supply pipelines and irrigation channels have been established, in order to perform favorable water level management according to rice growth and weather, the target water level of the paddy field is set appropriately, and the measured water level is above the target water level. The water supply valve is controlled so as to be within a predetermined allowable range. For example, in the paddy field irrigation system described in Japanese Patent Application Laid-Open No. 8-37950 (see Patent Document 1), when the paddy field water level is equal to or lower than the allowable lower limit value of the target water level, the paddy field water level becomes the allowable upper limit value of the target water level. The water supply valve is automatically controlled to supply water. Furthermore, in the above technique, water temperature meters are installed in the paddy field and the irrigation canal, and if the temperature difference is not within a predetermined allowable range, water supply is performed even if the paddy water level is less than the allowable lower limit value of the target water level. I am trying not to. The reason for this is to prevent cold damage from occurring if water in the irrigation channel having a low water temperature is supplied to the paddy field.

  Moreover, in the paddy field irrigation system described in JP-A-9-65776 (see Patent Document 2), irrigation can be performed while automatically changing the water level of the paddy field according to the growth stage of rice. Moreover, in the irrigation management system for paddy fields described in JP-A-8-275684 (see Patent Document 3), the water level and water temperature of all the scattered paddy fields are measured, and the measurement data is transmitted to the home by a transceiver, Based on such information, the water supply unit is controlled by a transceiver to supply water. Further, in the automatic irrigation system for paddy fields described in JP-A-8-116807 (see Patent Document 4), a water sensor is provided by providing a temperature sensor and a water level detection sensor in the paddy field, and operating the actuator based on the detection result. Water is supplied from the water storage facility by opening and closing the gate. Further, in the paddy field water level management apparatus described in Japanese Patent Laid-Open No. 9-205908 (see Patent Document 5), a water supply means, a drainage means, a water level and a water temperature measurement means, and an individual radio for each of the sections partitioned in a grid pattern. Station, and sequentially transmit the water level and water temperature measurement data in the flow direction of the water channel between individual radio stations adjacent to the nearest station from the far station, and further to the central control means via the relay radio station, A water supply command is sent in the reverse direction.

JP-A-8-37950 JP-A-9-65776 JP-A-8-275684 JP-A-8-116807 JP-A-9-205908

Thus, in the prior art, it is possible to automatically supply water only when the temperature difference between the paddy water temperature and the irrigation water temperature is within an allowable range that does not cause the growth delay of rice, thereby preventing the cold damage of rice. Therefore, the production volume can be increased and the workload of Noya is reduced.
By the way, (1) The difference between the paddy water temperature and the irrigation water temperature is generally from the evening to the night, so in the conventional technology, a storage pool is provided for the irrigation canal and a command is issued. This makes it possible to supply water at night.
However, in the current situation in many paddy fields, the pumps are operated to feed the water from the water source into the irrigation channel, and the water supply work to each paddy field is performed during the operation of the pumps. In other words, it is impossible to always store water in the water storage pool. In such paddy fields, the pumping pump operating time zone may not match the allowable time zone stated in the prior art, so even if you want to feed water, There may be a situation in which is not performed. In particular, in an area where the pump is operated manually, the pump is often started in the morning and stopped in the evening, so that the situation where water supply cannot be performed as in the prior art increases.

In addition, (2) in the prior art, the water supply valves installed for each of the plurality of paddy fields are not particularly controlled, and independent control is performed for each water supply valve. Therefore, in paddy field areas consisting of multiple sections, when paddy fields that require water supply start water supply all at once, there may be situations where water does not reach the terminal paddy field or a paddy field that definitely needs water supply. Conceivable. In other words, the above situation occurs because the operation of the pump does not catch up with the amount of water supply.
In addition, according to (3) “Atsuyuki Nakayama: Analysis of water shortage of paddy fields (1), Noiko Technical Technique 190, p31-46 (1995)” If the water supply strength is low when water supply is performed after water supply after making rice soil and watering (drying the water and giving oxygen to the basement before the ears appear), water loss due to infiltration and evaporation will increase rapidly. As a result, the amount of water supply increases, and it takes time to progress the flooding (speed of storing water).
Therefore, in paddy fields composed of multiple plots, when paddy fields that require water supply at the time of paddying or after half-drying start water supply at the same time, the water supply intensity of each paddy field becomes small, so it takes a lot of time for dredging. Or irrigation water shortages often occur.

(the purpose)
Accordingly, an object of the present invention is to provide a water management system for paddy fields that solves these conventional problems, supplies water appropriately according to the actual situation of paddy fields, and avoids cold water temperature disturbances.
In addition, another object of the present invention is to perform appropriate water supply work for a paddy field area composed of a plurality of sections, and to make the water supply work more efficient and effective so as not to run out of irrigation water. To provide a water management system.

In order to achieve the above object, a water management system for paddy fields according to the present invention controls a pumping device installed in a irrigation channel for introducing water from a water source to a paddy field, and controls the flow rate of the irrigation channel. a management system, a water temperature measuring means for measuring the temperature of the rice paddies, and water temperature measuring means for measuring the temperature of the water is the water supply to the paddy field, the difference between the paddy water temperature and the water feed temperature is smaller than a predetermined value, characterized Rukoto and control means for operating the pumping device.

  As described above, according to the present invention, appropriate irrigation water supply that matches the actual situation of the paddy field is performed, so that it is possible to avoid a cold water temperature failure and is suitable for a paddy field composed of a plurality of sections. Water supply work can be carried out to improve the efficiency and effectiveness of the water supply work so as not to run out of irrigation water.

Embodiments of the present invention will be described below in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a schematic configuration diagram of a paddy field water management system according to the present invention.
The water management system of the present invention includes a water level meter 1-j (j = 1,..., 30) that measures the water level of the paddy field, a water temperature meter 2-j that measures the temperature of the water in the paddy field, and a water supply pipeline. A water temperature meter 112 for measuring the temperature of the water, a water supply valve 3-j for opening and closing the water supply in the water supply pipeline, a drain valve 4-j for opening and closing the drainage of the drainage pipeline, a computer 106 for managing the water supply and drainage of the paddy field, and the computer 106 A data transmission path 107 which is a wireless medium from the wireless transmission / reception antenna, a pumping pump 108 for pumping water from a water source pond, a water supply pipeline 109, and a drainage pipeline 110.

The paddy field area subject to water management is composed of 30 1-ha paddy fields 5-j, similar to the large section paddy field model area promoted by the Ministry of Concentration. In each partitioned paddy field 5-j, a water level meter 1-j, a water temperature meter 2-j, a water supply valve 3-j, and a drain valve 4-j are installed one by one. It is attached, and the water level, water temperature, water supply amount, water supply pressure, water discharge amount, and valve operation amount of the paddy field 5-j are transmitted to the computer 106 via the data transmission path 107 at every predetermined measurement cycle.
Here, the valve operation amount is represented by a valve opening (in%). The data transmission path 107 uses a wireless space, but may be either wireless or wired. In the case of a wired connection, a track installed in the ground or in the air is required.
At the upstream end of the water supply pipeline 109, a pumping pump 108 for pumping water from the water source pond 111 to the water supply pipeline 109 is installed. A radio transceiver is also attached to this pump, and the pump is installed at every predetermined measurement cycle. The pumping amount and pump operation amount are transmitted to the computer 106 via the data transmission path 107. A water temperature meter 112 is installed in the water supply pipeline 109. Although not shown, a wireless transceiver is also attached, and the water temperature is supplied to the computer 106 via the data transmission path 107 at predetermined intervals. Sending.

FIG. 2 is a functional block diagram of various processing programs stored in the hardware configuration diagram inside the computer and the storage means in FIG.
As shown in FIG. 2, the computer 106 includes a CPU 221, a RAM 222, a hard disk device 223, a floppy disk device 224, an MO disk device 225, a DVD device 226, a CD-ROM device 227, a RAM card device 228, an input device. 229 and a display device 230.
The CPU 221 controls the operation of the entire water management system, determines the operation amount of the control devices such as the water supply valve 3-j, the drainage valve 4-j, and the pumping pump 108, and performs the water management of the paddy field 5-j. It is a processing device. The RAM 222 is a storage device that loads various processing programs and various data.
The hard disk device 223 is a storage device that stores various processing programs 201 to 203 and a database 211 on a magnetic disk. The floppy (registered trademark) disk device 224, the MO disk device 225, the DVD (digital video disk) device 226, the CD-ROM (compact disk) device 227, and the RAM card device 228 are all the same as the hard disk 223. This is a device for reading and writing the contents stored in each recording medium in which the processing programs 201 to 203 and the database 211 are recorded. Note that 201 is a processing program for determining a target water level, 202 is a program for performing control processing of a pump, and 203 is a program for controlling processing of a water supply / drainage valve.

The input device 229 is a device for inputting the rice planting date of the paddy field 5-J necessary for the execution of the target water level setting processing program 201, the allowable water temperature range required for the execution of the pumping pump control processing program 202, and the like. is there. In addition, the display device 230 includes a target water level of the paddy field 5-j calculated by the various processing programs 201 to 203 and its allowable range, a pumping pump control schedule, each water supply valve control schedule, a water level meter 1-j, and a water temperature meter 2- j, water temperature meter 112, water supply valve 3-j, drainage valve 4-j, water level of paddy field 5-j transmitted from pumping pump 108, water temperature, water supply amount, water supply pressure, water discharge amount, water supply amount of water supply pipeline 108, It is a device that displays water temperature, etc.
Here, since the various processing programs 201 to 203 and the database 211 may be recorded in any of the above storage media, the following is an example in which the hard disk device 223 is used as a device for reading and writing the recording medium. explain.

The computer 106 determines the operation amounts of the pumping pump 108, the water supply valve 3-j, and the drain valve 4-j, and performs paddy field water management that can avoid a cold water temperature failure. In the paddy water management, various processing programs 201 to 203 and the database 211 stored in the hard disk device 223 are loaded and stored in the RAM 222, and the CPU 221 executes the following processing corresponding to the various processing programs 201 to 203. That is,
(1) Processing for determining the target water level of paddy field 5-j and its allowable range (2) Processing for automatically controlling pumping pump 108 (3) Processing for automatically controlling water supply valve 3-j and drain valve 4-j Are executed sequentially. Hereinafter, the execution method of the said process (1)-(3) is demonstrated.

FIG. 3 is a diagram showing an example of a target water depth table according to the number of days after rice transplanting in the present invention.
First, the process (1) for determining the target water level of the paddy field 5-j and its allowable range realized by the target water level determination processing program 201 will be described with reference to FIG. In the processing program 201, at a predetermined time once a day, the target water level of the paddy field 5-j and its allowable range are determined based on the target water level database 211.
The target water level database 211 stores a target water level table from rice planting and harvesting by rice variety and region corresponding to the number of days elapsed from the rice planting date, and an allowable range table thereof.

The thick line in FIG. 3 is the target water level table, and the broken line is the allowable range table (upper limit and lower limit). The growth stage is shown below the table. Immediately after rice planting, the water level is set low in order to increase the water temperature of the paddy field, and gradually deepens as the rice grows. When it comes to the splitting season (when new stems come out and the stock grows thick), the water temperature is raised by raising the water temperature and promoting the growth and splitting of rice. During the ineffective period, the rice is dried and the soil is dried to supply enough oxygen to the rice roots. After mid-drying, intermittent irrigation is repeated until harvesting, but the booting season is the time when water is most needed, and the water is sufficiently flooded for 10 to 2 weeks.
The target water level table and its allowable range table allow the target water level and its allowable range to be specified from the number of days after rice planting based on past rice growth data, water level data, weather data, and the like. You may refer to rice harvesting distributed by agricultural cooperatives and agricultural test centers. Note that the above table is not fixed, but is a flexible table that can be changed at any time to incorporate the farmer's originality.

  The processing program 201 selects a corresponding target water level table and its allowable range table from the database 211 based on the rice variety / region of the paddy field 5-j input from the input device 229. Further, the number of days elapsed from the date of rice transplanting of paddy field 5-j input to the current day input from input device 229 is compared with the target water level table of the selected paddy field 5-j and its allowable range table, and paddy field 5- Determine an appropriate target water level for j and its tolerance. The determined target water level and its allowable range are valid from the current execution time of the processing program 201 to the next execution time. In this way, the CPU 221 determines the target water level for the day of the paddy field 5-j and its allowable range by the processing program 201.

FIG. 4 is a diagram showing trends in paddy water temperature and irrigation water temperature.
The process (2) for performing the automatic control of the pumping pump 108 realized by the pumping pump control processing program 202 will be described with reference to FIG. In the processing program 202, the operation amount (ON / OFF state) of the pump 180 is determined at the same timing as the water temperature measurement cycle of the water thermometer 2-j and the water thermometer 112, and a control signal is sent to the pump 180. Send.
In the pumping pump processing program 202, the representative value TP of the water temperature of the paddy field 5-j measured by the water temperature meter 2-j, the water temperature TF in the water supply pipeline 109 measured by the water temperature meter 112, and the input device 229 The operation amount of the lift pump 108 is determined by comparing with the input threshold value δ.
That is,
・ When TP-TF ≦ δ, pumping pump = ON
・ When TP-TF> δ, pumping pump = OFF
And That is, when the difference between the water temperature in the water supply pipeline 109 and the water temperature of the paddy field exceeds the threshold value, the above-mentioned control law stops the pump, and is below the threshold value. Is to operate a pump.

Here, as the representative value of the water temperature in each of the paddy fields 5-j, an appropriate value may be used from the average value, the maximum value, the minimum value, or the value of any one of the paddy field water temperatures.
By automatically controlling the pumping pump 108 as described above, the pumping pump 108 is operated only when the difference between the paddy water temperature and the water temperature is smaller than a predetermined value. Replenishment is possible.
In addition, due to cost constraints of the water management system , if either of the paddy water thermometer 2-j or the water temperature thermometer 112 is not installed, an unmeasured value (TP or TF) in the above control law is used. It may be 0. That is, when each paddy field thermometer 2-j is not installed (TP = 0), the pumping pump 108 is operated only when the irrigation water temperature is higher than a predetermined value, so that the paddy field water temperature is hardly affected. This makes it possible to supply water to avoid cold water temperature problems. On the other hand, when the water temperature gauge 112 is not installed (TF = 0), the pumping pump 108 is operated only when the paddy water temperature is lower than a predetermined value, so that the water temperature is less affected by the water temperature. It is possible to supply water to avoid obstacles.

  By the way, the water temperature generally rises smoothly during the day and falls smoothly at night. Usually, the paddy field is shallower than the water source pond, so that the paddy field changes more greatly during the daytime and at night, and the water temperatures TP and TF change as shown in FIG. The upper temperature curve is the paddy water temperature TP (thick line) and the service water temperature TF (dashed line), and the lower curve is the water temperature difference (TP-TF) (thick line) and the threshold (dashed line). As is apparent from the lower curve, once the water temperature difference falls below the threshold value, the state is considered to continue throughout the night. Therefore, the operation of the pumping pump 108 is considered not to cause frequent ON / OFF switching. As described above, the CPU 221 automatically controls the pumping pump 108 by the pumping pump processing program 202.

FIG. 5 is a flowchart of valve control processing executed by the water supply / drainage valve control processing program of FIG.
Processing for automatically controlling the water supply valve 2-j and the water discharge valve 3-j so that the water level of the paddy field 5-j realized by the water supply / drainage valve control processing program 203 falls within the allowable range of the target water level (3 ) Will be described with reference to FIG. In the water supply / drainage valve control processing program 203, the open / close state of the water supply valve 2-j and the drainage valve 3-j is determined at the same timing as the water level measurement cycle of the water level gauge 1-j, and an open / close signal is transmitted to each valve. .
First, the latest paddy water level measured by the water level meter 1-j, the operation amount (ON / OFF state) of the pumping pump 108 determined in the pumping pump processing program 202, and the target water level determining processing program 201 The target water level of paddy field 5-j and its allowable range are read (step 501), and water supply valve 3-j and drain valve 4-j are operated based on the following conditions for opening / closing the water supply / drain valve.
・ Water supply valve opening condition: Pumping pump operation and paddy water level <target water level-allowable range ・ Water supply valve closing condition: pumping pump stopped or paddy water level> target water level / drainage valve opening condition: paddy water level> target water level + allowable Range / drain valve closing condition: paddy water level <target water level

That is, if the pumping pump 108 is operated and the paddy field water level is below the target water level lower limit (target water level-allowable range), the water supply valve 3-j is opened and water supply is started (steps 502 and 503). ). As a result, if the water level of the paddy field 5-j gradually increases and the paddy field water level exceeds the target water level, or if the pumping pump 108 is stopped, the water supply valve 3-j is closed and water supply is stopped ( Steps 504, 505).
Thus, water supply is performed so as to maintain the water level of the paddy field 5-j within the allowable range of the target water level only when the paddy field is not easily affected by the cold water temperature failure. Conversely, if the paddy water level exceeds the target water level upper limit (target water level + allowable range), the drain valve 4-j is opened and drainage is started (steps 506, 507). As a result, when the water level of the paddy field 5-j gradually falls and the paddy field water level falls below the target water level, the drain valve 4-j is closed and drainage is stopped (steps 508 and 509). Thereby, drainage is performed so as to maintain the water level of the paddy field 5-j within the allowable range of the target water level. As described above, the CPU 221 automatically controls the water supply valve 3-j and the drain valve 4-j by the processing program 203.
As described above, in the first embodiment, by measuring and comparing the paddy water temperature and / or the irrigation water temperature, and appropriately supplying water to the paddy field area, Water management of paddy fields that can be avoided is possible.

(Second embodiment)
FIG. 6 is a hardware configuration diagram inside the computer and a block diagram of various processing programs according to the second embodiment of the present invention.
As is apparent from FIG. 6, the processing and configuration of the computer 106, which is a difference from the first embodiment, is that the function of the program is different. Specifically, the pumping pump processing program 202 existing in the first embodiment is deleted, and a water supply sequence determination processing program 602 is provided instead, and a processing program 603 for water supply valve control and drain valve control is provided. , 604 are provided independently.
In the first embodiment, the target water level control of the water supply valve 3-j and the drainage 4-j is performed independently for each paddy field 5-j. However, when many paddy fields 5-j need water supply all at once and start water supply all at once, the water does not reach the paddy field at the end or the water field that definitely needs water supply. Problems such as time consuming or lack of irrigation water may occur.
Therefore, the computer 106 in FIG. 6 determines the amount of operation of the water supply valve 3-j and the drainage valve 4-j, and performs paddy field water management to improve the efficiency and effectiveness of the water supply operation.

Here, it is assumed that the operation of the pumping pump 108 is performed every day at a predetermined time period, and appropriate water supply is supplied to the water supply pipeline 109. In the paddy water management, the various processing programs 201, 602 to 604 and the database 211 stored in the hard disk device 223 are loaded and stored in the RAM 222, and the CPU 221 performs the following processing corresponding to the various processing programs 201, 602 to 604: Are executed sequentially.
(1) Processing for determining the target water level of paddy field 5-j and its allowable range (execution of program 201)
(2) Processing for determining the water supply order of paddy field 5-j (execution of program 602)
(3) Processing for automatically controlling the water supply valve 3-j (execution of the program 603)
(4) Processing for automatically controlling the drain valve 4-j (execution of the program 604)
Here, since the process (1) is the same as the target water level determination process 201 described in the first embodiment, the description is omitted, and the execution method of the processes (2) to (4) is described in detail. To do.
First, in the water supply sequence processing program 602 of the paddy field 5-j realized by the water supply sequence determination processing program 602, once a day at a predetermined time (for example, immediately before starting the operation of the pumping pump 108 on the current day) The water supply order of paddy field 5-j is determined.

FIG. 7 is a flowchart of processing executed by the water supply order determination processing program in FIG.
First, the elapsed days from the previous water supply date of the paddy field 5-j is calculated based on the water supply amount data measured by the water supply valve 3-j (step 701), and the elapsed days are the minimum number of days of a predetermined water supply interval. Only the paddy fields that have been described above are selected as paddy fields that can be supplied with water (step 702). Here, the minimum number of water supply intervals means the effective use of water in water-deficient areas by limiting the water supply to each paddy field once in several days in a paddy area consisting of multiple sections. This is an irrigation method that allows for fair water supply to paddy fields, and is the interval between water supply days that need to be opened at a minimum. The minimum number of days for the water supply interval is determined in advance for each paddy field 5-j according to the area of the paddy field 5-j and the water reduction depth.
Next, in the processing program 602, the latest paddy water level measured by the water level meter 1-j and the target water level of the paddy field 5-j determined in the processing program 201 and its allowable range are read for each of the above-mentioned water supply possible rice fields. (Step 703), the water supply order is assigned in descending order of the value of “target water level−allowable range−paddy water level” (step 704). Here, “target water level−allowable range−paddy water level” represents the amount of water shortage with respect to the target water level lower limit value, and the larger the value, the faster the water supply is required.
As described above, in the CPU 221, a water supplyable paddy field is selected from the paddy fields 5-j by the processing program 602, and the water supply order is determined according to the necessity of water supply.

Next, the process (3) for performing automatic control of the water supply valve 3-j realized by the water supply valve control processing program 603 will be described. In the processing program 603, the opening / closing state of the water supply valve 3-j is determined at the timing when the pumping pump 108 is started / stopped and when the water supply of the paddy field 5-j in the water supply is stopped. Sends an open / close signal.
FIG. 8 is a flowchart of the water supply valve control process of the water supply valve control process program.
First, the latest paddy water level measured by the water level meter 1-j, the water supply amount / water pressure measured by the water supply valve 3-j, the pump operation amount (ON / OFF state) transmitted from the pumping pump 108, and the processing The target water level of the paddy field 5-j determined in the program 201 and its allowable range, and the water supply order of the water supply capable paddy field 5-j determined in the processing program 602 are read (step 801). However, the water supply sequence of the water supply paddy field 5-j is read only once after the latest value is updated. Further, the water supply amount / water supply pressure can be read by a measuring instrument attached to the water supply valve 3-j.

Next, in the water supply valve control processing program 603, the water supply valve 3-j is operated based on the following water supply guideline.
-Supply water only while the pump is operating.
-Supply water according to the above water supply sequence.
・ The number of paddy fields that supply water at the same time does not exceed the predetermined upper limit.
・ The water supply or water supply pressure of the paddy field where water is supplied does not fall below the specified lower limit.
・ Water supply is stopped when the paddy water level> target water level.
That is, when the pumping pump 108 is operated (step 802), a paddy field that is not supplied with water and has the highest water supply order is selected from the paddy fields 5-j that can be supplied with water (step 804). The number of supplied paddy fields when water is supplied to the selected paddy field does not exceed a predetermined upper limit (step 805), and the water supply amount or the supply water pressure in the supplied paddy field falls below a predetermined lower limit value. If not (step 806), the water supply valve 3-j is opened and water supply is started (step 807).

As a result, if the water level of the paddy field 4-j gradually rises and the paddy field level exceeds the target water level, or if the pumping pump 108 is stopped, the water supply valve 3-j is closed and water supply is stopped ( Steps 803 and 809). Thereby, according to the necessity of water supply, water supply is performed with respect to the paddy field 5-j according to the determined water supply order.
In addition, since the upper limit check of the number of supplied water fields (step 805) and the water supply amount / water supply pressure of the supplied water fields can be obtained, new water supply is performed, so that water can be supplied in a short time. .
As described above, the CPU 221 automatically controls the water supply valve 3-j by the processing program 603.

Next, the process (4) for automatically controlling the drain valve 4-j realized by the drain valve control processing program 604 will be described. In the drain valve control processing program 604, the open / close state of the drain valve 4-j is determined at the same timing as the water level measurement cycle of the water level gauge 1-j, and an open / close signal is transmitted to each valve.
FIG. 9 is a flowchart of valve control processing executed by the drain valve control processing program.
First, the latest paddy field water level measured by the water level meter 1-j, the target water level of the paddy field 5-j determined in the target water level determination processing program 201 and its allowable range are read (step 901), and the following drainage The drainage valve 4-j is operated based on the opening / closing conditions of the valve.
・ Drain valve opening condition: paddy water level> target water level + tolerance ・ Drain valve closing condition: paddy water level <target water level

That is, if the paddy water level exceeds the target water level upper limit value (target water level + allowable range), the drain valve 4-j is opened and drainage is started (steps 902, 903).
As a result, when the water level of the paddy field 5-j gradually falls and the paddy field water level falls below the target water level, the drain valve 4-j is closed and drainage is stopped (steps 904 and 905). Thereby, drainage is performed so as to maintain the water level of the paddy field 5-j below the target water level upper limit value. As described above, in the CPU 221, the drain valve 4-j is automatically controlled by the drain valve control processing program 604.
As described above, in the second embodiment, sufficient water can be supplied to the paddy field at the end or a field that needs water supply by performing the ring water supply according to the necessity of water supply. In consideration of the number of simultaneous water supply fields, water supply amount, and water supply pressure, it is possible to reduce the amount of water dredged in a short time and reduce the volume of water supply by making the water supply linked to each paddy field. Water management of paddy fields that can be realized is possible.

As described above, in the paddy field water management system according to the first embodiment, only when the difference between the paddy field temperature and the irrigation water temperature is equal to or lower than a predetermined allowable value, the irrigation water supply to the paddy field is performed via the irrigation channel. In this case, water is supplied to each paddy field, so paddy field water can be supplied to avoid cold water temperature problems, and the problem that water supply cannot be performed because there is no water in the irrigation channel can be solved. it can.
In addition, even when only one of the paddy water temperature and the irrigation water temperature is measured, only when the paddy water temperature is lower than the predetermined value or when the irrigation water temperature is higher than the predetermined value, water supply is made to the paddy area through the irrigation channel. In this case, water is supplied to each paddy field, so the same effect as above can be expected, and the number of parts is small compared to the above water management system, that is, it is inexpensive and easy to maintain. Water management methods can be realized.

Further, in the paddy field water management system according to the second embodiment, the water supply order is determined for each paddy field according to the difference between the paddy field target water level and the paddy field water level, and water is supplied according to the order. Will not start water supply all at once, so even if it is a paddy field at the end, if it is urgently necessary to supply water, it becomes possible to supply water immediately.
In addition, only the paddy fields that have passed the predetermined number of days since the previous water supply day are selected as the water supply available paddy fields, and the water supply on the day is performed only for the water supply available paddy fields. This eliminates the need for fair rotation irrigation.
In addition, an upper limit is set for the number of paddy fields that are to be supplied at the same time, and paddy field water supply is performed only when the water supply amount or water supply pressure is equal to or higher than a predetermined value, so that water can be supplied in a short time with sufficient water supply intensity. Become. This makes it possible to prevent a sudden increase in water loss due to infiltration and evaporation accompanying a decrease in the water supply strength when water is refilled or when water supply is performed after drying in the middle, and water supply with a high water-saving effect can be performed.

It is a system configuration figure showing the outline of the water management system of the present invention. 1 is a hardware configuration diagram inside a computer and a block diagram of various processing programs showing a first embodiment of the present invention; It is explanatory drawing which shows an example of the target water depth table according to the elapsed days after rice transplanting by this invention. It is explanatory drawing which shows the trend of paddy field water temperature and water temperature for service. It is a flowchart of the supply / discharge valve control processing which shows the 1st Example of this invention. It is a hardware block diagram inside a computer which shows the 2nd Example of this invention, and a block diagram of various processing programs. It is a flowchart of the water supply order determination process in 2nd Example of this invention. It is a flowchart of the water supply valve control processing in 2nd Example of this invention. It is a flowchart of the drain valve control process in 2nd Example of this invention.

Explanation of symbols

1-j ... Water level gauge, 2-j ... Water temperature gauge, 3-j ... Water supply valve, 4-j ... Drain valve,
5-j ... paddy field, 106 ... computer, 107 ... data transmission path, 108 ... pumping pump,
109 ... water supply pipeline, 110 ... drainage pipeline, 111 ... water source pond,
221 ... CPU, 222 ... RAM, 229 ... input device, 230 ... display device,
201 ... Target water level determination processing program, 202 ... Pumping pump processing program,
203 ... Water supply / drainage valve control processing program, 211 ... Target water level database,
224 ... FD, 225 ... MO, 226 ... DVD, 227 ... CD-ROM,
228 ... RAM card, 602 ... water supply sequence determination processing program,
603 ... Water supply valve control processing program, 604 ... Drain valve control processing program.

Claims (1)

A water management system for a paddy field that controls a pumping device installed in a water channel for introducing water from the water source to a paddy field, and controls the flow rate of the water channel,
Water temperature measuring means for measuring the water temperature of the paddy field,
Water temperature measuring means for measuring the temperature of water supplied to the paddy field,
A water management system for paddy fields, comprising control means for operating the pumping device when a difference between the paddy water temperature and the feed water temperature is smaller than a predetermined value.

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