JP2020109233A - Overflow adjusting device and overflow adjusting method - Google Patents

Abstract

To provide an overflow adjusting device and an overflow adjusting method to suppress fluctuation of a water level generated at a downstream of a dam after the overflow of the dam occurs.SOLUTION: An overflow adjusting device is provided with: a dam water level detection part 401 detecting an overflowed water level of a dam 100; a dam water level determination part 402 determining the detected water level; a reducing water operation controller 403 performing a reducing water operation to control the water level of the dam 100 at a constant level; a guide channel water level detection part 404 detecting a water level of a guide channel 102 extending from a water inlet to an electric generator 103; a guide channel water level determination part 405 determining the detected water level; and a water inlet gate opening/closing control part 406 controlling opening/closing of the water inlet gate 601. The reducing water operation controller 403 starts the reducing water operation in a case that the water level detected by the dam water level detection part 401 is at a predetermined level. Then, the water inlet gate opening/closing control part 406 opens the water inlet gate 601 by a specific amount when a predetermined gap (amount) 604 exists between a water level detected by the guide channel water level detection part 404 and a water level for water consumption at a maximum output of the electric generator 103.SELECTED DRAWING: Figure 4

Description

The present invention relates to an overflow rate adjusting device and an overflow rate adjusting method for adjusting an overflow rate of a dam.

Conventionally, in rivers in Japan, there are dams that block water in the middle of the river. The purpose of each dam varies, but many dams have generators in operation. In such a dam, when there was a large amount of rainfall, the water that could not be used for power generation was discharged from the dam as it was, so the water that had been blocked by the dam overflowed and flowed downstream from the dam. A so-called overflow occurs when water flows.

As a related technique, specifically, for example, conventionally, for example, the amount of water flowing into the regulating pond dam from the generator side located upstream and the water stored in the regulating pond dam are taken to the downstream side via a water intake gate. There is a technique related to a regulating pond dam water level control system that controls the water level of a regulating pond dam by adjusting the amount of discharged water (for example, refer to Patent Document 1 below).

As a related technique, specifically, conventionally, for example, when the stored water level is higher than the upper threshold water level, a water level lowering control step is executed to lower the water level of the water stored in the water storage facility. Reduce the water level to the target water level. In addition, when the stored water level is lower than the lower threshold water level, the water level rise control step is executed to raise the water level of the water stored in the water storage facility, and this water level is set as the raised target water level. There is a technique relating to a method of adjusting the amount of discharge from a discharge means to a river (for example, refer to Patent Document 2 below).

JP2012-82646A JP, 2016-75039, A

However, if the rain rises after the overflow occurs, the water that had flowed to the river will disappear, and there will be no water flowing downstream from the dam. In the downstream river, the fluctuation of river water level was large when the water level decreased. Large fluctuations in river water level, especially the decrease in water level due to reduced water, have a large impact on downstream rivers, such as fish being left behind, causing various problems such as protests from fishermen's cooperatives and other river users. Will end up.

In order to avoid this problem, it is necessary for a person to monitor and control the flow rate by a person, and it takes a lot of time and labor for the monitoring and control for that purpose. Further, the manual diversion control is difficult to determine, and depending on the situation, the above-mentioned problem may occur without necessarily obtaining the expected result.

In addition, the related technology does not adjust the water level when the dam overflows, nor does it suppress the fluctuation of the water level when the downstream river decreases due to the dam overflow. Nor is it adjusted based on the water level in the headrace.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, it is an object of the present invention to suppress the fluctuation of the water level downstream of the dam caused by the overflow of the dam.

In order to solve the above-described problems and achieve the object, the overflow control device according to the present invention is a dam water level detection unit that detects the water level of a dam that is overflowing, and a water level detected by the dam water level detection unit. A dam water level determination unit that makes a determination, a water reduction operation control unit that performs a water reduction operation that controls the water level of the dam to be kept constant, and a water channel water level detection unit that detects the water level of the water channel from the intake to the generator. And a water intake channel opening/closing control unit for controlling the opening/closing of the gate of the water intake, the dam water level determining unit, When the water level detected by the dam water level detection unit is a predetermined water level, the water reduction operation control unit starts the water reduction operation and is determined by the headrace water level determination unit. As a result, when there is a predetermined gap between the water level detected by the water channel water level detection unit and the water level of the amount of water used at the maximum output of the generator, the intake gate opening/closing control unit , A process of opening the gate by a predetermined amount is performed.

Further, the overflow control device according to the present invention, in the above invention, comprises a timekeeping unit for timing the time, the headrace water level detection unit, based on the timekeeping by the timekeeping unit, to start the water reduction operation. It is characterized in that the water level is detected after a lapse of a predetermined time.

Further, the overflow control device according to the present invention is characterized in that, in the above-mentioned invention, the process by the intake gate opening/closing control unit is repeatedly performed until the overflow of the dam is eliminated.

Further, in the above invention, the overflow control device according to the present invention is provided with a time measuring unit for measuring time, and the headrace channel water level detection unit performs predetermined processing after performing the process based on the time measurement by the time measuring unit. It is characterized in that the water level is detected after a lapse of time.

Further, the overflow control method according to the present invention, after overflow of the dam, when the water level of the dam reaches a predetermined water level, starts a water reduction operation for controlling to keep the water level of the dam constant. After that, if a predetermined gap is detected in the water level of the water conduit from the intake to the generator, the gate of the intake is opened by a specified amount when the maximum gap of the water used at the maximum output of the generator is detected. It is characterized by carrying out.

Further, the overflow control method according to the present invention is characterized in that, in the above-mentioned invention, the detection of the predetermined gap in the water level of the water conduit is performed after a predetermined time has elapsed from the start of the water reduction operation. To do.

Further, the overflow control method according to the present invention is characterized in that, in the above-mentioned invention, when the predetermined gap is detected at the water level of the headrace, the process is repeated until there is no overflow of the dam. And

Further, the overflow control method according to the present invention is characterized in that, in the above-mentioned invention, the detection of the predetermined gap in the water level of the water conduit is performed after a predetermined time has elapsed after the processing.

According to the overflow control device and the overflow control method of the present invention, it is possible to suppress the water level fluctuation downstream of the dam caused by the occurrence of the overflow of the dam.

It is explanatory drawing (the 1) which shows typically an example of the state of a dam in the overflow control device and the overflow adjustment method of embodiment concerning this invention. It is explanatory drawing (the 2) which shows typically an example of the state of a dam in the overflow amount adjusting device and overflow amount adjusting method of embodiment concerning this invention. It is a block diagram showing an example of hardware constitutions of an overflow control device of an embodiment concerning this invention. It is a block diagram showing an example of functional composition of an overflow control device of an embodiment concerning this invention. It is explanatory drawing which shows an example of the content of the water level adjustment database (DB). It is explanatory drawing which shows an example of the cross section of a water conduit. It is explanatory drawing which shows an example of the water level of a water reduction operation. 6 is a graph showing the relationship between time and flow rate. It is a flow chart which shows an example of the procedure of processing of the overflow control method of an embodiment concerning this invention.

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an overflow rate adjusting device and an overflow rate adjusting method according to the present invention will be described in detail below with reference to the accompanying drawings.

(About the condition of the dam)
1 and 2 are explanatory diagrams schematically showing an example of a state of a dam in the overflow rate adjusting device and the overflow rate adjusting method according to the embodiment of the present invention. FIG. 1 shows the state of the dam during normal operation, and FIG. 2 shows the state of flooding due to rainfall or the like.

1 and 2, the dam 100 includes a dam bank 101, a water conduit 102, a generator 103, and a water discharge channel 104. By damming the river water by the dam bank 101, a reservoir 111 is formed upstream of the dam bank 101 (on the left side of the dam bank 101 in FIG. 1). Further, reference numeral 112 on the downstream side of the dam bank 101 (on the right side of the dam bank 101 in FIG. 1) indicates a river on the downstream side of the dam bank 101.

As shown in FIG. 1, during normal operation, the water level of the reservoir 111 does not exceed the height of the dam bank 101, and no overflow occurs. In the water conduit 102 that guides the water in the reservoir 111 to the generator 103, the amount of water used at the maximum output of the generator 103 is secured. Then, the power generator 103 rotates the turbine with the water to generate electric power, and then discharges the water to the downstream 112 via the water discharge channel 104.

On the other hand, when the amount of water in the river increases due to heavy rain and the amount of water used at the maximum output of the generator is secured, but there is still excess water, as shown in Figure 2, dam dam body The water dammed by 101 overflows, and overflow causes dam overflow 101.

In FIG. 2, reference numeral 201 indicates the flow rate of water overflowing from the dam bank 101, that is, the overflow rate. In this way, the water flows from the dam bank 101 to the downstream river 112, and the water level of the downstream river 112 temporarily rises. After that, when the rain rises, the water flowing to the river 112 downstream from the dam embankment 101 disappears, and water reduction occurs in the downstream river 112. In order to suppress this water reduction, the overflow rate is adjusted using the overflow rate adjustment device.

(Hardware configuration of the overflow control device)
Next, the configuration of the overflow control device according to the embodiment of the present invention will be described. FIG. 3 is a block diagram showing an example of the hardware configuration of the overflow control device of the embodiment according to the present invention.

In FIG. 3, a computer that realizes an overflow rate adjusting device that automatically adjusts the overflow rate is a CPU (Central Processing Unit) 301, a memory 302, various sensors 303, an input device 304, a display device 305, And an interface 306. The respective units 301 to 306 included in the computer are connected by a bus 300.

The CPU 301 controls the entire computer. The memory 302 stores programs such as a boot program and data that forms various databases. The memory 302 is used as a work area for the CPU 301. The memory 302 can be realized by, for example, a ROM (Read-Only Memory), a RAM (Random Access Memory), a HDD (Hard Disc Drive), an HD (Hard Disc), or the like.

The various sensors 303 are sensors for detecting the dam water level and the headrace water level. Specifically, a water level meter, a monitoring camera, an analyzing device of the image of the monitoring camera, and other devices having a function of detecting the water level may be used. Further, the various sensors 303 may be connected to a computer via the interface 306.

The input device 304 gives various operation instructions of the overflow control device, and also inputs various data. The input device 304 may be a keyboard, a pointing device, or a touch panel, in addition to various switches and buttons. The display device 305 is a display or the like that displays information about the dam water level and the water level of the headrace.

The interface 306 is connected to a network such as a telephone line or the Internet and controls information communication between the inside of the computer and an external device. The interface 306 may be connected to an opening/closing drive device for the intake gate or a control device for another dam, and may transmit/receive control signals such as a water reduction operation.

(Functional configuration of the overflow control device)
FIG. 4 is a block diagram showing an example of a functional configuration of the overflow control device of the embodiment according to the present invention. In FIG. 4, the overflow control device includes a dam water level detection unit 401, a dam water level determination unit 402, a water reduction operation control unit 403, a water channel water level detection unit 404, a water channel water level determination unit 405, and an intake gate. It is configured to include an opening/closing control unit 406 and a clock unit 407. Furthermore, the overflow control device is provided with a water level adjustment database (DB) 500 that stores various data used when performing the overflow adjustment. The contents of the water level adjustment DB 500 will be described in detail later with reference to FIG.

The dam water level detection unit 401 detects the water level of the dam. The function of the dam water level detection unit 401 can be realized by the various sensors 303 shown in FIG. 3, for example. The dam water level detection unit 401 may detect the water level of the dam, for example, in real time, or may detect the water level at every predetermined time.

The dam water level determination unit 402 determines the water level detected by the dam water level detection unit 401. The function of the dam water level determination unit 402 can be realized by, for example, the CPU 301, the memory 302, and the like. The water level determination by the dam water level determination unit 402 is performed based on the data stored in the water level adjustment DB 500. The water level determination by the dam water level determination unit 402 is specifically, for example, a determination as to whether the overflow water level has been reached (whether an overflow has occurred, or whether the overflow that had occurred has ended). And determining whether the water level is the water level at which the water reduction operation is started.

The water reduction operation control unit 403 is a control unit that performs water reduction operation. The function of the water reduction operation control unit 403 can be realized by, for example, the CPU 301, the memory 302, the interface 306, and the like. As a result of the determination by the dam water level determination unit 402, the water reduction operation control unit 403 determines that the water level detected by the dam water level detection unit 401 is a predetermined water level (“reduction operation start water level”) related to the data stored in the water level adjustment DB 500. )) is displayed, the water reduction operation is started.

The water reduction operation is an operation for controlling the water level of the dam 100 so as to keep it constant. Specifically, for example, the flow rate of another dam upstream is adjusted, or the opening/closing of an intake gate 601 described later is controlled to control the dam water level so as to keep it constant. As a result, the overflow rate 201 overflowing from the dam bank 101 due to flooding can be made constant.

The water channel water level detection unit 404 detects the water level in the water channel 102 that continues from the intake port to the generator. The function of the headrace water level detection unit 404 can be realized by, for example, the various sensors 303 shown in FIG. The water level in the water conduit 102 detected by the water level detecting unit 404 may be detected, for example, in real time, or the water level may be detected every predetermined time.

The water channel water level determination unit 405 determines the water level detected by the water channel water level detection unit 404. The function of the headrace water level determination unit 405 can be realized by, for example, the CPU 301, the memory 302, and the like. The water level determination by the headrace water level determination unit 405 is performed based on the data stored in the water level adjustment DB 500. The water level determination by the headrace water level determination unit 405 is specifically performed by, for example, decreasing how much the water level in the headrace 102 is lower than the water level of the amount of water used at the maximum output of the generator. Includes determination of how much space is generated or whether the volume of space that has been generated has reached the space volume ("the volume of water in the headrace channel") of the data stored in the water level adjustment DB 500. ..

Here, the predetermined gap is a gap (amount) 604 taken by the lowered water level with respect to the water level of the amount of water used at the maximum output of the generator. Details of the predetermined gap will be described later with reference to FIG.

The intake gate opening/closing control unit 406 controls the opening/closing of the intake gate 601 provided at the intake for taking water into the water conduit 102. The function of the intake gate opening/closing control unit 406 can be realized by, for example, the CPU 301, the memory 302, the interface 306, and the like. Specifically, the intake gate opening/closing control unit 406 controls the opening/closing of the intake gate 601 by transmitting an opening/closing drive signal to an opening/closing drive device of the intake gate 601 (not shown). ..

Then, the water intake gate opening/closing control unit 406, as a result of the determination by the water channel water level determination unit 405, the water level detected by the water channel water level detection unit 404, and the water level of the amount of water used at the maximum output of the generator 103, If there is a predetermined gap between the two, a process of opening the gate by a predetermined amount is performed. Here, the predetermined amount for opening the gate is determined based on the opening amount (“intake gate opening amount”) concerning the data stored in the water level adjustment DB 500.

The timer unit 407 measures time. The timer unit 407 can realize its function by the CPU 301 and the memory 302, for example. Specifically, the CPU 301 has a function of measuring time, and the function may be used, and although not shown, it may be separately provided with a clock for measuring time. Good.

Then, the headrace water level detection unit 404 detects the water level of the headrace from the intake port to the generator after a predetermined time has elapsed from the start of the water reduction operation, based on the timing by the timing unit 407. Good.

The water intake gate opening/closing control unit 406 determines whether the water level detected by the water level detection unit 404 between the water level detected by the water level determination unit 405 and the water level of the amount of water used at the maximum output of the generator. When there is a predetermined gap, the process of opening the gate by a predetermined amount may be repeated until the dam overflows.

At this time, the headrace channel water level detection unit 404 detects the water level in the headrace channel 102 after a predetermined time has elapsed after performing the previous process of opening the gate by a predetermined amount based on the time counting by the timer unit 407. You may This predetermined time may be a detection waiting time required for the data stored in the water level adjustment DB 500.

(Contents of the water level adjustment database (DB))
FIG. 5 is an explanatory diagram showing an example of the contents of the water level adjustment database (DB). In FIG. 5, the water level adjustment database (DB) 500 stores data on the water level at the start of water reduction operation, data on the gap volume of the headrace water level, data on the opening of the intake gate, and data on the detection waiting time. ing.

The data regarding the water reduction operation start water level is data regarding the water level at which the water reduction operation control unit 403 starts the water reduction operation. Specifically, this water level may be, for example, the distance (height) from the apex position of the dam bank 101, or the distance (height) from other reference positions (for example, the bottom of the reservoir). It may be.

The dam water level determination unit 402 determines the water level detected by the dam water level detection unit 401 based on the data regarding the water reduction operation start water level. As a result, the water reduction operation control unit 403 reduces the water level when the water level detected by the dam water level detection unit 401 is a predetermined water level, that is, the water level (○ cm) according to the data related to the water reduction operation start water level. Start driving.

The data on the porosity of the headrace water level is the data on the difference between the water level detected by the headrace water level detection unit 404 and the water level of the amount of water used at the maximum output of the generator. Specifically, this gap amount may be, for example, the distance between the water level detected by the water channel water level detection unit 404 and the water level of the amount of water used at the maximum output of the generator, and the difference between other amounts ( For example, the difference in flow rate).

The headrace water level determination unit 405 determines the water level detected by the headrace water level detection unit 404 based on the data regarding the void volume of the headrace water level. As a result, the intake gate opening/closing control unit 406 determines that a predetermined gap between the water level detected by the water channel water level detection unit 404 and the water level of the amount of water used at the maximum output of the generator, that is, the water channel water level. If there is a gap (○○cm) in the data regarding the gap, the process to open the intake gate by a specified amount is performed.

When the water intake gate opening/closing control unit 406 repeatedly performs this process, the gap amount of the headwater level may be the same each time, and the gap amount of the headwater level is changed each time the process is performed. You may do it. In that case, different void amounts may be stored for the first time, the second time, the third time,.... Specifically, for example, the void amount may be reduced as the number of times is repeated, or conversely, the void amount may be increased.

The data regarding the opening amount of the intake gate is data regarding the opening amount of the intake gate that is processed by the intake gate opening/closing control unit 406. This opening amount is specifically the distance (width) at which the intake gate opens. The intake gate opening/closing control unit 406 performs processing for opening the intake gate based on the data (XX cm) regarding the opening amount of the intake gate.

When the intake gate opening/closing control unit 406 repeatedly performs this process, the intake gate opening amount may be the same each time, and the intake gate opening amount may be changed each time the processing is performed. May be. In that case, different opening amounts may be stored for the first time, the second time, the third time,.... Specifically, for example, the opening amount may be reduced each time the number of times is repeated, or conversely, the opening amount may be increased.

The data regarding the detection waiting time is that the water channel water level detection unit 404 detects the water channel water level from the intake port to the generator after a predetermined time (XX hours XX minutes) has elapsed since the water reduction operation was started. This is data on the time to start (first time). In addition, when performing repeated processing, it is data regarding the time to start detecting the water level of the water conduit from the intake port to the generator after a predetermined time has elapsed since the previous opening of the gate by a predetermined amount. (Second time and later).

When the headrace water level detection unit 404 repeatedly performs this processing, the detection waiting time may be the same each time, or the detection waiting time may be changed each time the processing is performed. In that case, different detection waiting times may be stored for the first time, the second time, the third time,.... Specifically, for example, the detection waiting time may be reduced each time the number of times is repeated, or conversely, the detection waiting time may be increased.

A plurality of patterns (pattern 1 to pattern N) may be provided for these data. A plurality of patterns may be provided, and the optimum pattern may be selected according to the season, the amount of rainfall in the past few days, future weather forecasts, the condition of other dams, and other conditions.

(Contents of headrace water level)
FIG. 6 is an explanatory diagram showing an example of a cross section of the water conduit. FIG. 6 shows an outline of a cross section of the water conduit 102. The water quantity inside the water conduit 600 is adjusted by the intake gate 601 and the water level inside the water conduit 600 is displaced in accordance with the water quantity adjustment. In the inside 600 of the headrace, reference numeral 602 indicates the water level (maximum water level) of the amount of water used at the maximum output of the generator 103, and reference numeral 603 indicates the water level (reduced water level) detected by the headrace water level detection unit 404. Is shown. In FIG. 6, the reduced water level 603 indicates a state in which the water level inside the water conduit 600 is lowered by the reduced water operation.

The difference 604 of the water levels between the maximum water level 602 and the reduced water level 603 indicates the gap volume of the headwater level. The water level difference 604 is generated when the water amount is reduced from the maximum water level due to the reduced water operation. Since the water level difference 604 is generated, the output of the generator 103 is also reduced accordingly. This is because even if the output of the generator 103 is temporarily reduced, it is prioritized to consider the influence of the overflow on the downstream side.

(Contents of dam water level)
FIG. 7: is explanatory drawing which shows an example of the water level of water reduction operation. In FIG. 7, reference numerals 701 to 705 indicate dam water levels, respectively. The water level 701 indicates the water level at which the water reduction operation is started. When the dam water level reaches the water level 701 while the water is overflowing, the water reduction operation control unit 403 starts the water reduction operation.

When the water reduction operation is started, the dam water level is maintained at the water level 701. Therefore, in principle, the dam water level will not change. Next, after a lapse of a predetermined time (specifically, for example, 6 hours), when the first gate opening process is performed in the state where the water reduction operation is continued, the dam water level suddenly increases. It drops to a water level 702. After that, the dam water level is maintained at the water level 702.

The decrease in the dam water level corresponds to the water level difference 604 inside the headrace 600. In other words, by opening the intake gate 601, the reduced water level 603 rises and reaches the maximum water level 602, so that the overflow rate decreases by the difference (gap amount) 604 of the water level and the dam water level increases. It has been lowered.

Then, after a further predetermined time has elapsed, when the gate opening process is performed a second time in a state where the water reduction operation is still performed, the dam water level decreases accordingly, and the dam water level changes from the water level 702 to the water level 703. And then the dam water level is maintained at the water level 703. Furthermore, when the gate opening process is performed for the third time while the water reduction operation is still being performed, the dam water level decreases accordingly, and the dam water level decreases from the water level 703 to the water level 704, and then the dam The water level is maintained at the water level 704.

In this way, the dam water level can be lowered stepwise by repeating the opening process of the intake gate 601 every predetermined time while continuing the water reduction operation. Then, the dam water level is gradually lowered to be finally lowered to the overflow end water level 705. Then, when the water level reaches the overflow end water level 705, the water reduction operation is ended.

(Results of overflow adjustment)
FIG. 8 is a graph showing the relationship between time and flow rate. In the graph of FIG. 8, the vertical axis represents the flow rate (t) and the horizontal axis represents the time (h). A curve graph 801 shows a temporal change in the flow rate (overflow rate) of the overflow when the water reduction operation is not performed even if the overflow occurs. As can be seen from the curve graph 801, if an overflow occurs, then the overflow decreases gradually with the passage of time, and in the example of the graph in FIG. ing.

On the other hand, the line graph 802 shows the temporal change of the overflow rate when the water reduction operation is performed after the overflow occurs and the opening process of the intake gate is repeated. In the line graph 802, the symbol A indicates the time point when the process of opening the intake gate 601 for the first time (gate opening process) is performed. Up to this time A, the overflow was constant, but at this time A, the overflow is rapidly decreasing. As a result of the decrease, the overflow rate is the same as the curve graph 801. After that, the overflow amount is constant over a period of about 6 hours until the time point of B. Reference B indicates the time when the second gate opening process is performed.

Similarly, the reference numeral C indicates the third time, the reference numeral D indicates the fourth time, and the reference numeral D indicates the fifth time when the respective gate opening processes are performed. In this way, since the overflow is gradually reduced, it is possible to prevent the water level from rapidly decreasing on the downstream side after the overflow is completed.

(Procedure for processing the overflow control device and overflow control method)
Next, a processing procedure of the overflow control method according to the embodiment of the present invention will be described. FIG. 9 is a flowchart showing an example of the procedure of processing of the overflow control method according to the embodiment of the present invention.

In the flowchart of FIG. 9, first, the dam water level is detected to determine whether or not the dam is overflowing (step S901). Here, if the dam has not overflowed (step S901: No), the series of processing is terminated without doing anything. On the other hand, when the dam overflows (step S901: Yes), the dam water level is detected, and if necessary, the water level of the headrace 102 is also detected to determine whether or not the dam water level is the water reduction operation start water level. The determination is made (step S902).

Here, when the dam water level is not the water level for starting the water reduction operation (step S902: No), the process returns to step S901. On the other hand, when the dam water level is the water level for starting the water reduction operation (step S902: Yes), the water reduction operation is started (step S903).

Then, it is determined whether or not a predetermined time has passed (step S904). Then, after waiting for a predetermined time to pass (step S904: No), if the predetermined time has passed (step S904: Yes), the water level of the headrace 102 is detected next, and the water level of the headrace 102 is detected. It is determined whether or not there is a predetermined gap (step S905).

Here, when there is no predetermined gap in the water level of the water conduit 102 (step S905: No), it waits until it occurs, and when a predetermined amount of gap has occurred (step S905: Yes), the intake gate 601. Is opened by a predetermined amount (step S906). As described above, if the intake gate 601 is opened during the water reduction operation, the water level of the dam will drop.

Therefore, the dam water level is detected and it is determined whether the dam overflow has stopped (step S907). Here, when the dam overflow has not stopped (step S907: No), the process returns to step S904 and waits again for a predetermined time to elapse. These steps S904 to S907 are repeatedly executed.

On the other hand, when the dam overflow has stopped (step S907: Yes), the water reduction operation ends (step S908), and then the series of processes ends.

As described above, the overflow control device and the overflow control method according to the embodiment of the present invention detect the water level of the dam 100 that is overflowing by the dam water level detection unit 401 and the dam water level detection unit 401. Dam water level determination unit 402 that performs the determined water level, water reduction operation control unit 403 that performs the water reduction operation that controls the water level of the dam 100 to be kept constant, and water level of the water conduit 102 from the intake port to the generator 103. Water level detecting section 404 for detecting the water level, water level determining section 405 for determining the water level detected by the water level detecting section 404, and intake gate opening/closing control section 406 for controlling the opening/closing of the intake gate 601. And are equipped with.

Then, as a result of the judgment by the dam water level judgment unit 402, if the water level detected by the dam water level detection unit 404 is a predetermined water level, the water reduction operation control unit 403 starts the water reduction operation, and the water conduit When there is a predetermined gap (quantity) 604 between the water level detected by the headrace water level detection unit 404 and the water level of the amount of water used at the maximum output of the generator 103 as a result of the water level determination unit 405. First, the intake gate opening/closing control unit 406 performs a process of opening the intake gate 601 by a predetermined amount.

As a result, when a dam overflow occurs, a certain amount (for example, a few tons) before the overflow stops, triggered by the start of operation (reduction operation) in the direction of decreasing water to keep the dam water level constant. It is possible to build a system that starts and reduces water by several t. In that case, it can be automatically controlled to facilitate control and monitoring. Check the dam water level and headrace water level, and at every predetermined time, check if there is a gap in the headrace to set the dam water level to the set water level, and if there is a gap, open the dam intake gate work. Since it is repeated until the dam overflow stops, it is possible to reduce the fluctuation of the river water level when the downstream river is in a low water condition. Can be suppressed.

In addition, the overflow control device and the overflow adjustment method according to the embodiment of the present invention include a timekeeping unit 407 that measures time, and the headrace water level detection unit 404 performs a water reduction operation based on the timekeeping by the timekeeping unit 407. The water level is detected after a predetermined time has elapsed from the start of the process or after a predetermined time has passed after the intake gate opening/closing control unit 406 has performed the process. It is possible to adjust the appropriate overflow and reduce the fluctuation of river water level.

Further, in the overflow control device and the overflow control method of the embodiment according to the present invention, the processing by the intake gate opening/closing control unit 406 is repeatedly performed until the dam overflow is eliminated, thereby adjusting the overflow flow more finely. Therefore, it is possible to reduce the fluctuation of the river water level when the water level of the downstream river decreases.

INDUSTRIAL APPLICABILITY As described above, the overflow control device and the overflow control method according to the present invention are useful for the overflow control device and the overflow control method for adjusting the overflow flow rate of a dam. It is suitable for an overflow control device and an overflow control method that suppress the water level fluctuation downstream of the dam that occurs thereafter.

100 Dam 101 Dam Embankment 102 Headrace 103 Generator 104 Discharge Canal 111 Reservoir (Upstream of Dam Embankment)
112 rivers (downstream of dam body)
201 Overflow rate 401 Dam water level detection unit 402 Dam water level determination unit 403 Water reduction operation control unit 404 Headrace channel water level detection unit 405 Headrace channel water level determination unit 406 Intake gate opening/closing control unit 407 Timing unit 500 Water level adjustment database (DB)
600 Inside of headrace 601 Intake gate 602, 603 Water level of headrace 604 Gap (quantity)
701-705 Dam water level

Claims (8)

A dam water level detector that detects the water level of the dam that is overflowing;
A dam water level determination unit that determines the water level detected by the dam water level detection unit,
A water reducing operation control unit that performs a water reducing operation for controlling the water level of the dam to be kept constant,
A headrace water level detection unit that detects the water level of the headrace from the intake to the generator,
A headrace water level determination unit that determines the water level detected by the headrace water level detection unit,
An intake gate opening/closing control unit that controls opening/closing of the intake gate;
Equipped with
As a result of the determination by the dam water level determination unit, the water level detected by the dam water level detection unit is a predetermined water level, the water reduction operation control unit starts the water reduction operation,
As a result of the judgment by the water conduit water level judgment unit, the water level detected by the water conduit water level detection unit and the water level of the amount of water used at the maximum output of the generator, if there is a predetermined gap, The overflow control device, wherein the water intake gate opening/closing control unit performs processing for opening the gate by a predetermined amount. Equipped with a timekeeping unit that keeps time
The water level detection unit according to claim 1, wherein the water level detection unit detects the water level after a lapse of a predetermined time from the start of the water reduction operation, based on the timekeeping by the timekeeping unit. Flow control device. The overflow control device according to claim 1 or 2, wherein the processing by the intake gate opening/closing control unit is repeatedly performed until there is no overflow of the dam. Equipped with a timekeeping unit that keeps time
The overflow control according to claim 3, wherein the water level detection unit of the water conduit detects the water level after a lapse of a predetermined time after performing the process, based on the time counting by the time counting unit. apparatus. After the dam overflows, when the water level of the dam reaches a prescribed water level, start a water reduction operation that controls to keep the water level of the dam constant,
After that, in the water level of the water conduit from the intake to the generator, if a predetermined gap is detected with respect to the water level of the amount of water used at the maximum output of the generator, the gate of the intake is opened by a predetermined amount. An overflow adjustment method characterized by the above. The overflow rate adjusting method according to claim 5, wherein the detection of the predetermined gap in the water level of the water conduit is performed after a predetermined time has elapsed from the start of the water reduction operation. The overflow control method according to claim 5 or 6, characterized in that, when the predetermined gap is detected at the water level of the water conduit, the process is repeated until there is no overflow of the dam. The overflow amount adjusting method according to claim 7, wherein the detection of the predetermined gap in the water level of the water conduit is performed after a predetermined time has elapsed after the processing.

Images