JP2021095711A - Rainwater inflow amount prediction apparatus, rainwater inflow amount prediction method, computer program, rainwater pump control system, and rainwater pump station system - Google Patents

Abstract

To provide a rainwater inflow amount prediction apparatus capable of lowering a risk of flooding and reducing the number of pump starts and stops in a rainwater pump dynamic control by predicting a rainwater inflow amount to a rainwater pump station with high prediction accuracy.SOLUTION: A rainwater inflow amount prediction apparatus according to an embodiment comprises: a start time acquisition section that acquires a start time of a rainwater drainage pump at a rainwater pump station; a water level acquisition section that acquires water levels of drainage in a drain pipe from plural water level gauges provided in a flowing-down direction of the drain pipe; a water level information output section that outputs, based on the water levels acquired by the water level acquisition section, flow amounts of drainage, arrival times taken until the drainage reach the rainwater pump station in association with the respective water level gauges; and an inflow amount output section that identifies a water level gauge among the plural water level gauges, where the arrival time is equivalent to the start time acquired by the start time acquisition section, and outputs a flow amount outputted based on the water level acquired from the identified water level gauge.SELECTED DRAWING: Figure 2

Description

Embodiments of the present invention relate to a rainwater inflow prediction device, a rainwater inflow prediction method, a computer program, a rainwater pump control system, and a rainwater pump station system.

In recent years, torrential rains and local heavy rains (so-called guerrilla rainstorms) have increased, and measures to avoid inundation damage are required. In response to this situation, the Ministry of Land, Infrastructure, Transport and Tourism is promoting inundation countermeasure projects by soft measures such as utilization of observation data such as rainfall information, in addition to hard measures such as maintenance of inundation countermeasure facilities. Against this background, as a soft measure, a stormwater pump dynamic control technology based on the prediction of the amount of rainwater inflow to the stormwater pump station has been developed mainly for the purpose of reducing the risk of inundation. The rainwater pump dynamic control technology predicts the amount of rainwater flowing into the rainwater pump station, and changes the starting water level and the stopping water level of the rainwater drainage pump according to the predicted value of the rainwater inflow amount. By changing the starting water level and the stopped water level, the rainwater drainage pump can be started and stopped efficiently, aiming to reduce the risk of inundation and the number of times the rainwater drainage pump is started and stopped.

Specifically, the problem to be solved by the stormwater pump dynamic control technology is that when there is a sudden inflow of rainwater into the rainwater pump station, the rainwater drainage pump does not start until the water level of the rainwater pump well reaches the starting water level. , The problem is that the risk of flooding increases. In addition, if the water level of the rainwater pump well has dropped but new rainwater has flowed into the rainwater pump well and you do not want to stop the running rainwater drainage pump, the water level of the rainwater pump well will fall below the stop water level and rainwater. There is also the problem that the drainage pump will stop.

Japanese Unexamined Patent Publication No. 2008-184783

In this way, in order to fully exert the effect of the dynamic control of the rainwater pump, it is necessary to predict the amount of rainwater inflow to the rainwater pump station with high accuracy. There is a possibility that the prediction accuracy is not sufficient because the amount of rainfall on the ground is used.

In addition, it is expected that the prediction accuracy will be improved by using the stormwater trunk line water level measured by the water level gauge of the sewer pipe, which is currently being installed as part of soft measures, to predict the inflow of rainwater. Since it is unclear whether or not to use, sufficient prediction accuracy cannot be obtained.

The problem to be solved by the present invention is the amount of rainwater inflow that can reduce the risk of inundation and the number of times the pump is started and stopped in the dynamic control of the rainwater pump by predicting the amount of rainwater inflow to the rainwater pump station with high prediction accuracy. It is to provide a predictor.

In order to solve the above problems, the rainwater inflow prediction device according to the embodiment includes a start time acquisition unit for acquiring the start time of the rainwater drainage pump at the rainwater pump station and a plurality of rainwater inflow predictors installed along the flow direction of the sewer pipe. Based on the water level acquisition section that acquires the water level of the sewage in the sewage pipe and the water level acquired by the water level acquisition section, the flow rate of sewage and the arrival time until the sewage reaches the stormwater pump station are determined respectively. The water level information output unit that outputs in correspondence with the water level gauge and the water level gauge that has the same arrival time as the startup time acquired by the startup time acquisition unit are specified from multiple water level gauges and acquired from the specified water level gauges. It is provided with an inflow amount output unit that outputs the output flow rate based on the water level.

Further, in order to solve the above problems, the rainwater inflow prediction method according to the embodiment includes a step of acquiring the start time of the rainwater drainage pump at the rainwater pump station and a plurality of water levels installed along the flow direction of the sewer pipe. A step to acquire the water level of sewage from the meter, and a step to output the flow rate of sewage and the arrival time until the sewage reaches the stormwater pump station according to each water level gauge based on the acquired water level. It has a step of specifying a water level gauge having an arrival time equivalent to the set start-up time from a plurality of water level gauges and outputting a flow rate output based on the water level obtained from the specified water level gauges.

Further, in order to solve the above problems, the computer program according to the embodiment is installed in the rainwater inflow prediction device with a function of acquiring the start time of the rainwater drainage pump at the rainwater pump station and along the flow direction of the sewer pipe. The function to acquire the water level of the sewage in the sewage pipe from multiple water level gauges, and based on the acquired water level, the flow rate of sewage and the arrival time until the sewage reaches the stormwater pump station correspond to each water level gauge. The function to output with and the water level gauge whose arrival time is equivalent to the acquired start-up time is specified from multiple water level gauges, and the output flow rate is output based on the water level acquired from the specified water level gauge. Realize the function.

The block diagram of the rainwater pump station system provided with the rainwater inflow amount prediction device which concerns on 1st Embodiment. The figure which shows the functional structure of the rainwater inflow amount prediction apparatus which concerns on 1st Embodiment. The figure which shows the variable used in Manning formula. The figure which shows the operation of the rainwater inflow amount prediction apparatus which concerns on 1st Embodiment. The figure which shows the data created by the operation of the rainwater inflow amount prediction apparatus which concerns on 1st Embodiment. The figure which shows the functional structure of the rainwater inflow amount prediction apparatus which concerns on 2nd Embodiment. The figure which shows the interpolation / extrapolation method in the rainwater inflow amount prediction apparatus which concerns on 2nd Embodiment. The figure which shows the interpolation method by linear interpolation and the extrapolation method in linear interpolation extrapolation. The figure which shows the operation of the rainwater inflow amount prediction apparatus which concerns on 2nd Embodiment.

Hereinafter, embodiments for carrying out the invention will be described.

(First Embodiment)
The rainwater inflow amount prediction device 151 according to the first embodiment will be described with reference to FIGS. 1 to 4.

FIG. 1 is a configuration diagram of a rainwater pump station system 1 including a rainwater inflow amount prediction device 151 according to the first embodiment. As shown in FIG. 1, the rainwater pump station system 1 includes water level gauges G1 to GN provided in the sewer pipe 10, a rainwater pump station 14, and a rainwater pump control system 15.

The sewer pipe 10 is a sewer pipe leading to the rainwater pump station 14. Along with rainfall, sewage including rainwater flows into the rainwater pump station 14 through the sewage pipe 10.

A plurality of water level gauges G1 to GN are installed along the flow direction of the sewer pipe 10, and acquire the water level of rainwater in the sewer pipe 10. In the present embodiment, "rainwater" is also used to mean sewage including rainwater. The rainwater pump station 14 includes an inflow culvert 141, a pump well 142, and rainwater drainage pumps P1 to PN.

The inflow culvert 141 is a drainage pipe that connects the sewer pipe 10 to the pump well 142, and rainwater from the sewer pipe 10 flows into the pump well 142.

The pump well 142 is installed on the most downstream side of the rainwater pump station 14, and stores the rainwater flowing in from the inflow culvert 141. In the pump well 142, rainwater is pumped by the rainwater drainage pumps P1 to PN and discharged to the river.

The rainwater pump control system 15 is used to control the start and stop of the rainwater drainage pumps P1 to PN. In the present embodiment, the rainwater drainage pump P1 is the pump that is first activated when rainwater is discharged from the pump well 142 to the river. Further, the rainwater drainage pumps P2 to PN are pumps that are selectively started according to the inflow (or expected inflow) flow rate.

The rainwater pump control system 15 includes a rainwater inflow amount prediction device 151 and a rainwater pump control device 152. The rainwater pump control system 15 acquires a water level signal from the water level gauges G1 to GN, predicts the amount of inflowing rainwater based on the acquired signal, and controls the rainwater drainage pumps P1 to PN. The operation unit 4 receives an operation by the operator or the administrator, and outputs a signal corresponding to the received operation to the rainwater inflow amount prediction device 151. The operation unit 4 is, for example, a keyboard, a mouse, a touch panel, or the like.

Next, the functional configuration of the rainwater inflow prediction device 151 will be described.

FIG. 2 is a diagram showing a functional configuration of the rainwater inflow amount prediction device 151 according to the first embodiment. The rainwater inflow amount prediction device 151 includes a water level acquisition unit 220, a storage unit 230, a water level information output unit 200, a start-up time acquisition unit 240, and an inflow amount output unit 210.

The water level acquisition unit 220 acquires the water level of rainwater from the water level gauges G1 to GN. The "rainwater level" of the present embodiment is also used to mean information on the rainwater level. The water level acquisition unit 220 outputs the acquired water level of the rainwater to the water level information output unit 200.

The water level information output unit 200 is a means for outputting the flow rate of rainwater and the arrival time until the rainwater reaches the rainwater pump station 14 for each water level gauge G1 to GN based on the water level acquired by the water level acquisition unit 220. is there. The water level information output unit 200 includes a flow velocity output unit 201, an arrival time output unit 202, and a flow rate output unit 203.

The flow velocity output unit 201 is a means for outputting the flow velocity of rainwater at the position of the water level gauge from the water level acquired by the water level acquisition unit 220. First, the flow velocity output unit 201 uses the water levels h1 to hN acquired by the water level gauges G1 to GN to obtain the flow velocity V1 to VN at the points where the water level gauges G1 to GN are installed from the Manning formula (1). calculate.

V = 1 / n x R ^2/3 x I ^1/2 ... (1)

V is the flow velocity (m / sec), n is the roughness coefficient (sec / m ^1/3 ), R is the diameter depth (m), and I is the energy gradient ≈ physical gradient. Further, n is a coefficient depending on the pipe type.

FIG. 3 is a diagram showing variables used in the equation (1). As shown in FIG. 3, A is the flow volume (m ² ) and S is the wet side (m). Further, h is the water level measured by the water level gauge. As shown in FIG. 3, the shape of the sewer pipe 10 ^{makes it possible to derive the flow volume A (m 2} ) and the wet side S (m) based on the water levels h1 to hN.

The formula showing the relationship between the diameter depth, the flow volume and the wet edge is shown in the formula (2).

R = A / S ... (2)

From the above equations (1) and (2), the flow velocity output unit 201 outputs the flow velocity V1 to VN of rainwater at the positions of the water level gauges G1 to GN from the water level acquired by the water level acquisition unit 220.

The flow rate output unit 203 is a means for outputting the flow rates Q1 to QN of the rainwater level gauges G1 to GN based on the flow velocities V1 to VN of the rainwater output by the flow velocity output unit 201 and the acquired water level. From the flow velocity V1 to VN at the point where the water level gauges G1 to GN are installed and the flow velocity A1 to AN at the point where the water level gauges G1 to GN are installed calculated by the formula (1), the formula (3) described later is obtained. The flow rates Q1 to QN at the points where the water level gauges G1 to GN are installed are calculated using this.

Q = V × A ・ ・ ・ (3)

The arrival time output unit 202 causes rainwater to reach the rainwater pump station 14 based on the flow velocity V1 to VN of the rainwater output by the flow velocity output unit 201 and the extension L1 to LN from the water level gauges G1 to GN to the rainwater pump station 14. It is a means for outputting the arrival times t1 to tN up to for the water level gauges G1 to GN. The extensions L1 to LN are input in advance from the operation unit 4 to the storage unit 230 by the operator or the administrator.

The storage unit 230 stores the extensions L1 to LN input from the operation unit 4 in association with the water level gauges G1 to GN.

The arrival time output unit 202 uses the equation (4) to reach the arrival time t1 to tN from the flow velocity V1 to VN at the point where the water level gauges G1 to GN output by the equation (1) are installed and the extension L1 to LN. Is calculated. Note that t is the arrival time (sec) and L is the extension (m).

t = L / V ・ ・ ・ (4)

The start-up time acquisition unit 240 is a means for acquiring the start-up time of the rainwater drainage pump P1 of the rainwater pump station 14. The operator or the administrator inputs the start-up time from the operation unit 4 to the storage unit 230 in advance. In the present embodiment, it is assumed that the start-up times of the rainwater drainage pumps P1 to PN are all the same. Therefore, hereinafter, the description of "rainwater drainage pump P1" can be applied to any of the rainwater drainage pumps P1 to PN. The activation time acquisition unit 240 acquires information including the activation time input to the storage unit 230. The "start-up time" referred to in the present application is the time from the start of operation of the rainwater drainage pump P1 to the steady operation state. Further, the time obtained by adding the control cycle to the start time of the rainwater drainage pump P1 may be set as the start time.

The start-up time acquisition unit 240 acquires the start-up time from the storage unit 230.

The inflow amount output unit 210 specifies a water level gauge having an arrival time equivalent to the start-up time acquired by the start-up time acquisition unit 240 from a plurality of water level gauges G1 to GN, and the water level acquired from the specified water level gauges. It is a means to output the flow rate output based on.

The inflow amount output unit 210 includes a specific unit 211 and a predicted inflow amount output unit 212.

The identification unit 211 is a means for specifying a water level gauge having an arrival time equivalent to the start-up time acquired by the start-up time acquisition unit 240 from a plurality of water level gauges G1 to GN. The identification unit 211 compares the arrival time t1 to tN calculated by the arrival time output unit 202 with the activation time acquired by the activation time acquisition unit 240, and specifies a water level gauge having the closest arrival time to the activation time. To do.

The predicted inflow amount output unit 212 is a predicted value of the inflow amount that flows into the rainwater pump station 14 from the flow rate output by the flow rate output unit 203 at the point where the water level gauge specified in the specific unit 211 is installed. It is a means to output to the rainwater pump control device 152 as an inflow predicted value.

Next, the functional configuration of the rainwater pump control device 152 will be described.

The rainwater pump control device 152 has a predicted inflow amount acquisition unit 251 and a control unit 252.

The predicted inflow amount acquisition unit 251 acquires the flow rate output from the predicted inflow amount output unit 212 of the inflow amount output unit 210.

The control unit 252 controls the drive of the rainwater drainage pumps P1 to PN based on the flow rate acquired by the predicted inflow amount acquisition unit 251.

Next, the operation of the rainwater inflow prediction device 151 will be described.

FIG. 4 is a diagram showing the operation of the rainwater inflow amount prediction device 151 according to the first embodiment.

FIG. 5 is a diagram showing an example of data created by the operation of the rainwater inflow amount prediction device 151 according to the first embodiment.

In S301, first, the start-up time acquisition unit 240 of the rainwater inflow amount prediction device 151 acquires the start-up time that has been input in advance from the operation unit 4 and is stored in the storage unit 230.

Next, in S302, the water level acquisition unit 220 acquires each water level from the water level gauges G1 to GN.

Next, in S303, the flow velocity output unit 201 of the water level information output unit 200 uses the above Manning formula based on the water levels h1 to hN of the water level meters G1 to GN at the point where the water level meters G1 to GN are installed. The flow velocities V1 to VN of rainwater are calculated and output.

Next, in S304, the flow rate output unit 203 of the water level information output unit 200 calculates the flow rate Q1 to QN of rainwater based on the flow velocity V1 to VN and the flow rate A1 to AN output from the flow velocity output unit 201. Output.

Next, in S305, the arrival time output unit 202 of the water level information output unit 200 becomes the flow velocity V1 to VN of the rainwater output by the flow velocity output unit 201 and the extension L1 to LN from the water level gauges G1 to GN to the rainwater pump station 14. Based on this, the arrival time t1 to tN at which the rainwater reaches the rainwater pump station 14 at the point where the water level gauges G1 to GN are installed is output.

Next, in S306, the specific unit 211 of the inflow amount output unit 210 uses the arrival time t1 to tN and the flow rate Q1 to QN output from the arrival time output unit 202 to determine the water level gauge G1 to the arrival time equivalent to the start time. Identify the GN. That is, the water level gauges G1 to GN having the arrival time closest to the start-up time are specified from the arrival times t1 to tN.

Next, in S307, the predicted inflow amount output unit 212 outputs to the rainwater pump control device 152 the flow rate corresponding to the water level gauges G1 to GN specified by the specific unit 211 among the flow rates output from the flow rate output unit 203. ..

The water level, the flow velocity, the flow rate, and the arrival time for each of the water level gauges G1 to GN thus obtained are stored in a storage unit (not shown) as the data shown in FIG.

The control of the rainwater inflow amount prediction device 151 of S300 to S308 is repeatedly executed at predetermined time intervals such as every 5 minutes.

In the present embodiment, by predicting the inflow amount of rainwater to the rainwater pump station 14 using the water level gauges G1 to GN, it is possible to predict the inflow amount of rainwater with higher prediction accuracy than before. The dynamic control of the rainwater pump based on the predicted value of the inflow of rainwater makes it possible to reduce the risk of inundation and the number of times the rainwater drainage pumps P1 to PN are started and stopped.

(Second embodiment)
In the first embodiment, when there is a water level gauge having a arrival time equal to or closest to the start time of the rainwater drainage pump P1, the water level gauge is specified to predict the amount of rainwater inflow.
In the second embodiment, it is determined whether or not there is a water level gauge having an arrival time equivalent to the start time of the rainwater drainage pump P1, and when there is no water level gauge having an equivalent arrival time, interpolation or extrapolation is performed. The value obtained in the above is used as the inflow amount.

The rainwater inflow prediction device 651 according to the second embodiment will be described with reference to FIGS. 6 and 9. The configuration of the rainwater inflow prediction device 651 having the same function as the rainwater inflow prediction device 151 of the first embodiment is designated by the same reference numerals and the description thereof will be omitted.

Since the configuration of the rainwater pump station system 1 including the rainwater inflow amount prediction device 651 according to the second embodiment is the same as that of the first embodiment, the description thereof will be omitted.

FIG. 6 is a diagram showing a functional configuration of the rainwater inflow amount prediction device 651 according to the second embodiment.

The difference in the functional configuration from the first embodiment is the inflow amount output unit 610 and the set time acquisition unit 640.

The set time acquisition unit 640 is a means for acquiring the arrival upper limit time and the arrival lower limit time set based on the start-up time and the start-up time of the rainwater drainage pump P1 of the rainwater pump station 14. In advance, the operator or the administrator inputs the start-up time, the arrival upper limit time, and the arrival lower limit time from the operation unit 4 to the storage unit 230. The set time acquisition unit 640 acquires the start-up time, the arrival upper limit time, and the arrival lower limit time input to the storage unit 230. The arrival upper limit time and the arrival lower limit time are upper limit values and lower limit values that can be judged to be equivalent to the start time of the rainwater pump, and may be arbitrarily set by the operator or the administrator. For example, plus 5% of the start-up time is set as the arrival upper limit time, and minus 5% of the start-up time is set as the arrival lower limit time. This makes it possible to determine whether or not there is a water level gauge that has an arrival time equivalent to the start-up time.

The inflow amount output unit 610 has a specific unit 611, an interpolation / extrapolation unit 613, and a predicted inflow amount output unit 612.

The specific unit 611 determines whether or not there is a water level gauge that has an arrival time of the arrival upper limit time or less and the arrival lower limit time or more acquired by the set time acquisition unit 640, and reaches the arrival upper limit time or less and the arrival lower limit time or more. It is a means for identifying the water level gauge when the time water level gauge is in any of the water level gauges G1 to GN.

The interpolation / insertion section 613 is the arrival time before and after the start-up time when there is no water level gauge in any of the water level gauges G1 to GN, which is the arrival time equal to or less than the arrival upper limit time and the arrival lower limit time or more in the specific unit 611. By interpolating from the flow rate at the point where the water level gauge is installed, the flow rate at the start-up time is calculated, and this is used as the predicted value of rainwater inflow. If there is only a point where a water level gauge that reaches either before or after the start-up time is installed, a water level gauge that arrives before the start-up time or after the start-up time is installed. By extrapolating from the flow rates at at least two points, the flow rate at the start-up time is calculated, and this is used as the predicted value of rainwater inflow.

A known method may be used for interpolation and extrapolation of the flow rate. As known interpolation methods, for example, polynomial interpolation, spline interpolation, zero-order interpolation, linear interpolation, paradigm interpolation, cubic interpolation, cubic interpolation and the like may be used. Also as a known extrapolation method. For example, linear extrapolation, Richardson's extrapolation, Aitken's Δsquare acceleration, Stefensen's transformation, and the like may be used.

Here, as the simplest example, the interpolation method by linear interpolation and the extrapolation method in linear extrapolation will be described.

FIG. 7 is a diagram showing an interpolation / extrapolation method in the rainwater inflow prediction device according to the second embodiment.

As shown in FIG. 7A, it is assumed that there are water level gauges G1, G2, and G3.

As shown in FIG. 7B, the water levels of the water level gauges G1, G2, and G3 are h1, h2, and h3, respectively. The flow velocities obtained based on the water levels of the water level gauges G1, G2, and G3 are V1, V2, and V3, respectively. The flow rates obtained based on the water levels of the water level gauges G1, G2, and G3 are Q1, Q2, and Q3, respectively. It is assumed that the arrival times obtained based on the flow velocities V1, V2, V3 and the extensions L1, L2, and L3 are 9 min, 6 min, and 3 min, respectively.

The start-up time acquired by the set time acquisition unit 640 is 10 min, and the arrival upper limit time is set to plus 5% with respect to the start-up time, and the arrival lower limit time is set to minus 5% with respect to the start-up time. Therefore, the arrival upper limit time is 10.5 min, and the arrival lower limit time is 9.5 min.

Looking at the column of arrival time in FIG. 7B, there is no water level gauge with an arrival time of 10.5 min or less and 9.5 min or more, and there is no water level gauge with an arrival time of 10 min or more, which is the start-up time. The flow rate is calculated by extrapolation 1.

FIG. 8 is a diagram showing an interpolation method by linear interpolation and an extrapolation method in linear extrapolation.

8 (a) and 8 (c) are diagrams in which the value of y, which is an unknown number, is obtained by extrapolation from the known y0 and y1. Extrapolation 1 corresponds to FIG. 8 (a).

FIG. 8B is a diagram in which the value of y, which is an unknown number, is obtained by interpolation from known y0 and y1.

In the case of FIGS. 8A, 8B and 8C, y can be obtained from the following equation (5).

y = y0 + {(x-x0) (y1-y0)} / (x1-x0) ... (5)

The flow rate at the start-up time of 10 min can be expressed as the formula (6) using the formula (5) from FIGS. 7 (b) and 8 (a).

y = Q2 + {(10-6) (Q1-Q2)} / (9-6) ... (6)

Here, x is the start-up time of 10 min, x1 is the arrival time of the water level gauge G1 of 9 min, x0 is the arrival time of the water level gauge G2 of 6 min, y1 is the flow rate Q1 of the water level gauge G1, and y0 is the flow rate Q2 of the water level gauge G2. did.

Therefore, it can be transformed as in the equation (7).

y = Q2 + {4 (Q1-Q2)} / 3 ... (7)

As shown in the equation (7), the amount of inflow to the rainwater pump station 14 when the start-up time is 10 min can be obtained by extrapolation 1.

Next, the start-up time acquired by the set time acquisition unit 640 is 5 min, the arrival upper limit time is set to plus 5% with respect to the start-up time, and the arrival lower limit time is set to minus 5% with respect to the start-up time. Therefore, the arrival upper limit time is 5.25 min and the arrival lower limit time is 4.75 min.

Looking at the column of arrival time in FIG. 7B, there is no water level gauge with arrival time of 5.25 min or less and 4.75 min or more, and there is a water level gauge with arrival time of 5 min or more, which is the start-up time, and 5 min or less. Since there is a water level gauge with the arrival time, the flow rate is calculated by interpolation 1.

Interpolation 1 corresponds to FIG. 8 (b).

The flow rate at the start-up time of 5 min can be expressed as the formula (8) using the formula (5) from FIGS. 7 (b) and 8 (b).

y = Q3 + {(5-3) (Q2-Q3)} / (6-3) ... (8)

Here, x is the start-up time of 5 min, x1 is the arrival time of the water level gauge G2 of 6 min, x0 is the arrival time of the water level gauge G3 of 3 min, y1 is the flow rate Q2 of the water level gauge G2, and y0 is the flow rate Q3 of the water level gauge G3. did.

Therefore, it can be transformed as in the equation (9).

y = Q3 + {2 (Q2-Q3)} / 3 ... (9)

As shown in the equation (9), the amount of inflow to the rainwater pump station 14 when the start-up time is 5 min can be obtained by interpolation 1.

Finally, the start-up time acquired by the set time acquisition unit 640 is 2 min, and the arrival upper limit time is set to plus 5% with respect to the start-up time, and the arrival lower limit time is set to minus 5% with respect to the start-up time. Therefore, the arrival upper limit time is 2.1 min, and the arrival lower limit time is 1.9 min.

Looking at the column of arrival time in FIG. 7B, there is no water level gauge with an arrival time of 2.1 min or less and 1.9 min or more, and there is no water level gauge with an arrival time of 2 min or less, which is the start-up time. The flow rate is calculated by extrapolation 2.

Extrapolation 2 corresponds to FIG. 8 (c).

The flow rate at the start-up time of 2 min can be expressed by the formula (10) using the formula (5) from FIGS. 7 (b) and 8 (c).

y = Q3 + {(2-3) (Q2-Q3)} / (6-3) ... (10)

Here, x is the start-up time of 2 min, x1 is the arrival time of the water level gauge G2 of 6 min, x0 is the arrival time of the water level gauge G3 of 3 min, y1 is the flow rate Q2 of the water level gauge G2, and y0 is the flow rate Q3 of the water level gauge G3. did.

Therefore, it can be transformed as in the equation (11).

y = Q3 + {-(Q2-Q3)} / 3 ... (11)

As shown in the equation (11), the amount of inflow to the rainwater pump station 14 when the start-up time is 2 min can be obtained by extrapolation 2.

In addition, the water level gauges G1 to GN are not limited to the two water level gauges that reach before and after the start-up time, but are interpolated according to the inflow amount output based on the two water level gauges other than before and after the start-up time. Alternatively, extrapolation may be performed. Further, not only two water level gauges but also two or more water level gauges may be used for interpolation or extrapolation.

The predicted inflow amount output unit 612 is a means for outputting the inflow amount output based on the water level acquired from the water level gauge specified by the specific unit 611 and the inflow amount calculated by the interpolation / extrapolation unit 613. ..

Next, the operation of the rainwater inflow prediction device 651 will be described.

FIG. 9 is a diagram showing the operation of the rainwater inflow amount prediction device 651 according to the second embodiment.

In S701, first, the set time acquisition unit 640 of the rainwater inflow prediction device 651 acquires the set time from the storage unit 230. The set time in the present embodiment is the start-up time of the rainwater drainage pump P1, the arrival upper limit time, and the arrival lower limit time.

Next, since the operations of S702 to S705 are the same as the operations of the rainwater inflow amount prediction device 151 in the first embodiment, the description thereof will be omitted. S702 to S705 in FIG. 9 are operations corresponding to S302 to S305 in FIG. 4, respectively.

In S706, the specific unit 611 of the inflow amount output unit 610 determines whether or not the water level gauge having the arrival time of the arrival upper limit time or less and the arrival lower limit time or more is in any of the water level gauges G1 to GN. That is, it is determined whether or not the arrival time that is equal to or less than the arrival upper limit time and equal to or more than the arrival lower limit time is in any of the arrival times t1 to tN calculated by the arrival time output unit 202. In S706, when the arrival time that is equal to or less than the arrival upper limit time and equal to or more than the arrival lower limit time is any of the arrival times t1 to tN, the process proceeds to S707.

In S707, the flow rate specified by the specific unit 611 of the inflow amount output unit 610 is output to the rainwater pump control device 152.

In S706, if the arrival time that is equal to or less than the arrival upper limit time and equal to or more than the arrival lower limit time is not in any of the arrival times t1 to tN, the process proceeds to S708.

In S708, the flow rate calculated by the interpolation / extrapolation unit 613 of the inflow amount output unit 610 is output to the rainwater pump control device 152.

The control of the rainwater inflow prediction device 651 of S700 to S709 is repeatedly executed at predetermined time intervals.

According to the present embodiment, it is determined whether or not there is a water level gauge whose arrival time is equal to or less than the arrival upper limit time and equal to or longer than the arrival lower limit time, and when there is no water level gauge having an arrival time equal to or less than the arrival upper limit time and more than the arrival lower limit time. By using the value obtained by interpolation or extrapolation as the inflow amount, it is possible to predict the rainwater inflow amount with higher prediction accuracy than before.

As described above, according to the first embodiment and the second embodiment, it is possible to predict the stormwater inflow amount with higher prediction accuracy than the conventional one. Therefore, the rainwater pump dynamic based on the stormwater inflow amount prediction value. By controlling, it is possible to provide a rainwater inflow prediction device that reduces the risk of inundation and the number of times the pump is started and stopped as compared with the conventional case.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Rainwater pump station system 4 ... Operation unit 10 ... Sewage pipe 14 ... Rainwater pump station 15 ... Rainwater pump control system 141 ... Inflow culvert 142 ... Pump wells 151, 651・ ・ ・ Rainwater inflow prediction device 152 ・ ・ ・ Rainwater pump control device 200 ・ ・ ・ Water level information output unit 201 ・ ・ ・ Flow velocity output unit 202 ・ ・ ・ Arrival time output unit 203 ・ ・ ・ Flow rate output unit 210 ・ ・ ・Inflow amount output unit 211 ... Specific unit 212 ... Predicted inflow amount output unit 220 ... Water level acquisition unit 230 ... Storage unit 240 ... Start-up time acquisition unit 251 ... Predicted inflow amount acquisition unit 252・ ・ ・ Control unit 610 ・ ・ ・ Inflow amount output unit 611 ・ ・ ・ Specific unit 612 ・ ・ ・ Predicted inflow amount output unit 613 ・ ・ ・ Insertion / external insertion unit 640 ・ ・ ・ Set time acquisition unit

Claims (9)

The start-up time acquisition unit that acquires the start-up time of the rainwater drainage pump at the rainwater pump station,
A water level acquisition unit that acquires the water level of the sewage in the sewer pipe from a plurality of water level gauges installed along the flow direction of the sewer pipe.
Based on the water level acquired by the water level acquisition unit, the water level information output unit that outputs the flow rate of the sewage and the arrival time until the sewage reaches the rainwater pump station in association with each water level gauge.
A water level gauge in which the start-up time acquired by the start-up time acquisition unit and the arrival time output by the water level information output unit are equivalent is specified from the plurality of water level gauges and acquired from the specified water level gauges. An inflow amount output unit that outputs the flow rate output based on the water level
A rainwater inflow prediction device equipped with. The water level information output unit outputs the arrival time based on the flow velocity of the sewage obtained from the water level acquired by the water level acquisition unit and the extension from the plurality of water level gauges to the rainwater pump station.
The rainwater inflow prediction device according to claim 1. The inflow amount output unit specifies a water level gauge having an arrival time equal to or less than the arrival upper limit time set based on the start-up time and not less than the set arrival lower limit time as the equivalent arrival time. To do
The rainwater inflow prediction device according to claim 1 or 2. The inflow amount output unit is the water level acquired from two or more water level gauges among the plurality of water level gauges when there is no water level gauge having the arrival time of the arrival upper limit time or less and the arrival lower limit time or more. The value obtained by interpolating or extrapolating according to the flow rate output based on the above is output as the inflow amount flowing into the rainwater pump station.
The rainwater inflow prediction device according to claim 3. The inflow amount output unit is the arrival time before and after the start time of the plurality of water level gauges when there is no water level gauge having the arrival time equal to or less than the arrival upper limit time and the arrival lower limit time. A value obtained by interpolating or extrapolating according to the inflow amount output based on the water level obtained from one water level gauge is output as the inflow amount flowing into the rainwater pump station.
The rainwater inflow prediction device according to claim 4. Steps to get the start time of the rainwater drainage pump at the rainwater pump station,
A step of acquiring the water level of the sewage in the sewer pipe from a plurality of water level gauges installed along the flow direction of the sewer pipe, and
Based on the acquired water level, a step of outputting the flow rate of the sewage and the arrival time of the sewage until it reaches the rainwater pump station in association with each water level gauge.
A step of specifying a water level gauge having the arrival time equivalent to the acquired start-up time from the plurality of water level gauges and outputting the flow rate output based on the water level acquired from the specified water level gauges.
A method for predicting the inflow of rainwater. For rainwater inflow prediction device,
The function to acquire the start time of the rainwater drainage pump at the rainwater pump station, and
A function to acquire the water level of the sewage in the sewer pipe from a plurality of water level gauges installed along the flow direction of the sewer pipe, and
Based on the acquired water level, a function to output the flow rate of the sewage and the arrival time until the sewage reaches the rainwater pump station in association with each water level gauge, and
A function of specifying a water level gauge having the same arrival time as the acquired start-up time from the plurality of water level gauges and outputting the flow rate output based on the water level acquired from the specified water level gauges.
A computer program to realize. The start-up time acquisition unit that acquires the start-up time of the rainwater drainage pump at the rainwater pump station,
A water level acquisition unit that acquires the water level of the sewage in the sewer pipe from a plurality of water level gauges installed along the flow direction of the sewer pipe.
Based on the water level acquired by the water level acquisition unit, the water level information output unit that outputs the flow rate of the sewage and the arrival time until the sewage reaches the rainwater pump station in association with each water level gauge.
A water level gauge having an arrival time equivalent to the start-up time acquired by the start-up time acquisition unit is specified from the plurality of water level gauges, and the flow rate output based on the water level acquired from the specified water level gauges is calculated. Inflow amount output unit to output and
A control unit that controls the drive of the rainwater drainage pump based on the flow rate output from the inflow amount output unit.
Stormwater pump control system equipped with. The rainwater drainage pump installed at the rainwater pump station,
A start-up time acquisition unit that acquires the start-up time of the rainwater drainage pump,
A water level acquisition unit that acquires the water level of the sewage in the sewer pipe from a plurality of water level gauges installed along the flow direction of the sewer pipe.
Based on the water level acquired by the water level acquisition unit, the water level information output unit that outputs the flow rate of the sewage and the arrival time until the sewage reaches the rainwater pump station in association with each water level gauge.
A water level gauge having an arrival time equivalent to the start-up time acquired by the start-up time acquisition unit is specified from the plurality of water level gauges, and the flow rate output based on the water level acquired from the specified water level gauges is calculated. Inflow amount output unit to output and
A control unit that controls the drive of the rainwater drainage pump based on the flow rate output from the inflow amount output unit.
Stormwater pump station system equipped with.

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