JP3887209B2 - Inflow prediction device - Google Patents

Description

ここで上記演算式（１）および下記演算式（２）において各記号は、以下のように設定する。
ｎ ： 管渠内の粗度係数
Ｒ ： 管渠の径深（水路形状および水位により変化する値）
ｙ ： 信号変換部から送信された水位値（点流速測定水深）
ｇ ： 重力加速度
Ａｒ ： 係数
【００２８】
次に流量検出手段２０の流量演算部５ｆは、演算式（１）において算出された係数Ａｒ、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの信号変換部５ａからの水位値、算出された管渠１３の径深値、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの設定部５ｃから送信された管渠１３内の粗度係数および重力加速度の値に基づいて、下記の演算式（２）を用いて補正係数Ｋｐを算出する。
【００２９】
【数２】

【００３０】
なお、補正係数Ｋｐを演算式（１）および（２）を用いて算出しているが、管渠１３内の流体１４の最大流速の発生位置を考慮した補正係数曲線に基づいて、算出してもよい。
【００３１】
図２に示すように流量検出手段２０の流量演算部５ｆは、算出された補正係数Ｋｐと、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの信号変換部５ａから送信された流速値に基づいて、演算式（３）を用いて管渠１３内の流体１４の平均流速を算出する（演算ａ）。
【００３２】
Ｖａ＝Ｋｐ・Ｖｐ （３）
【００３３】
ここで上記演算式（３）において各記号は、以下のように設定する。
Ｖａ ： 管渠内の流体の平均流速
Ｖｐ ： 信号変換部から送信された流速値（点流速）
【００３４】
流量検出手段２０の流量演算部５ｆは、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの信号変換部５ａから送信された水位値に基づいて流体１４の断面積を算出し（演算ｂ）、算出された流体１４の断面積に算出された平均流速を乗じて（演算ｃ）、流体１４の流量を算出する（演算ｄ）。算出された流量は、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの判定部５ｅに送信される。
【００３５】
また、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの理想値演算部５ｄは、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの信号変換部５ａから送信された水位値、算出された管渠１３の径深値、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの設定部５ｃから送信された管渠１３の勾配値および管渠１３内の粗度係数に基づいて、演算式（４）（Ｍａｎｎｉｎｇ式）を用いて流体１４の平均流速を算出する（演算ｅ）。
【００３６】
ここで管渠１３の勾配値は、予め予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの設定部５ｃに設定されているが、外部端末７または監視部８によりケーブル１０、１２を介して、自由に設定変更できるようになっている。
【００３７】
【数３】

【００３８】
ここで上記（４）式において各記号は、以下のように設定する。
ｎ ： 管渠内の粗度係数
Ｒ ： 管渠の径深（水路形状および水位により変化する値）
Ｉ ： 管渠の勾配
【００３９】
次に予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの理想値演算部５ｄは、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの信号変換部５ａから送信された水位値に基づいて流体１４の断面積を算出し（演算ｆ）、算出された流体１４の断面積に算出された流体１４の平均流速を乗じて（演算ｇ）、流量の理想値を算出する（演算ｈ）。算出された流量の理想値は、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの判定部５ｅに送信される。
【００４０】
予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの判定部５ｅは、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの理想値演算部５ｄから送信された流量の理想値と流量検出手段２０の流量演算部５ｆから送信された流量値（実測値）の偏差を算出し、算出された偏差が予め設定された範囲内にあるか否かの判定を行なう（演算ｉ）。
【００４１】
ここで、予め設定された範囲（設定範囲）は、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの設定部５ｃにおいて、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの理想値演算部５ｄから送信された流量の理想値の１０％が設定されているが、外部端末７または監視部８によりケーブル１０、１２を介して自由に設定変更できるようになっている。予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの設定部５ｃに設定された設定範囲は、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの判定部５ｅに送信される。
【００４２】
図３に示すように管渠１３内の理想的な流れの状態（等流）が継続している場合には、実測値（プロットｘ）と理想値ａが略一致する（ｃ）。また、何らかの影響で理想的な流れが妨げられると、実測値（プロットｘ）が理想値ａから外れてくる（ｄ）。ここで、破線部ｂと理想値ａに挟まれた範囲を予め設定された範囲ｅとする。
【００４３】
なお図３において、縦軸は管渠１３内の流体１４の流量を示し、横軸は管渠１３内の流体１４の水位を示している。
【００４４】
図４において、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの判定部５ｅは、上述したように予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの理想値演算部５ｄから送信された流量の理想値と流量検出手段２０の流量演算部５ｆから送信された流量値（実測値）の偏差を算出する（Ｓｔｅｐ１）。
【００４５】
次に予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの判定部５ｅは、算出された偏差が予め設定された範囲内である場合に、流れ状態が流下状態であると判定する（Ｓｔｅｐ２）。予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの判定部５ｅは、流れ状態が流下状態であると判定すると予め設定された流下状態用の予測演算式を用い（Ｓｔｅｐ３）、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの信号変換部５ａからの水位値と流量検出手段２０の流量演算部５ｆからの流量値とに基づいて、一定時間経過後（ｎ分後）の流体流入量を予測する（Ｓｔｅｐ４）。一方、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの判定部５ｅは、算出された偏差が予め設定された範囲外である場合に、流れ状態が貯留状態であると判定する（Ｓｔｅｐ２）。予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの判定部５ｅは、流れ状態が貯留状態であると判定すると予め設定された貯留状態用の予測演算式を用いて（Ｓｔｅｐ３ａ）、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの信号変換部５ａからの水位値と流量検出手段２０の流量演算部５ｆからの流量値とに基づいて、一定時間経過後（ｎ分後）の流体流入量を予測する（Ｓｔｅｐ４）。
【００４６】
ここで、一定時間（ｎ分）は、予め予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの設定部５ｃに設定されているが、外部端末７または監視部８よりケーブル１０、１１を介して、自由に設定変更できるようになっている。
【００４７】
予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの判定部５ｅは、予測した流体流入量を予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの信号出力部５ｂに送信し、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの信号出力部５ｂは、送信された流体流入量をケーブル１１を介して監視部８に送信する。監視部８は送信された流体流入量をケーブル１７を介して制御部１６に送信し、制御部１６は、送信された流体流入量の値に基づいて、ポンプおよび流入ゲートの制御量を算出する（Ｓｔｅｐ５）。制御部１６は、算出された制御量でポンプおよび流入ゲートを制御する（Ｓｔｅｐ６）。
【００４８】
なお、流体流入量は、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの判定部５ｅにおいて予測されているが、監視部８が流体流入量を予測してもよい。
【００４９】
次に本発明の変形例について説明する。
【００５０】
予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅには、雨量を計測する地上雨量計が接続され、予測演算部５ａ、５ｂ、５ｃ、５ｄ、５ｅの判定部５ｅは、地上雨量計からの雨量の値と外部端末７または監視部８から入力された降雨レーダの情報をさらに考慮して流体流入量を予測してもよい。
【００５１】
【発明の効果】
本発明によれば、管渠または開渠内の流れ状態が流下状態または貯留状態かを判定し、流体の流れ状態に適合した予測演算式を用いることにより、流体流入量の予測の精度を向上させることができる。
【００５２】
また、簡易な構成で流体流入量の予測の精度を向上させることができることから、降雨レーダを用いて流体流入量を予測する流入量予測装置よりコストを低く抑えることができる。
【図面の簡単な説明】
【図１】本発明による流入量予測装置の実施の形態を示す全体構成図
【図２】流量の実測値と理想値の算出方法を示す図
【図３】流体流入量を予測するフローチャートを示す図
【図４】Ｍａｎｎｉｎｇ式により算出された流量を示す図
【符号の説明】
１ 流速計
２ 水位計
５ 演算部
５ａ 信号変換部
５ｂ 信号出力部
５ｃ 設定部
５ｄ 理想値演算部
５ｅ 判定部
５ｆ 流量演算部
７ 外部端末
８ 監視部
１５ 流入量予測装置
２０ 流量検出手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inflow amount predicting apparatus that predicts a fluid inflow amount flowing into a drainage facility, and more particularly to an inflow amount predicting apparatus that predicts a fluid inflow amount in consideration of a fluid flow state.
[0002]
[Prior art]
As a flow meter for measuring the flow rate of a fluid such as sewage or factory waste water, an electromagnetic flow meter, an ultrasonic flow meter, a cough flow meter, or the like is known. Among them, the flow rate / water level calculation type flow meter, which is one of the ultrasonic flow meters, is easy to install even when the pipe diameter is large, and there are few obstacles to the flow of fluid in the pipe. Yes, it is widely used.
[0003]
The conventional inflow prediction device that predicts the inflow of fluid is based on information from the ground rain gauge, rainfall radar, water level gauge, and the above-mentioned flow meter, etc. Something that predicts is known.
[0004]
However, the flow state of the fluid in the pipe tube is different between the flow-down state and the storage state. For this reason, if the fluid inflow amount is predicted using the same prediction calculation formula for both the flowing state and the storage state of the fluid in the pipe rod, the accuracy of the prediction of the fluid inflow amount is improved. descend.
[0005]
[Problems to be solved by the invention]
Conventionally, it has a water level meter that measures the water level of the fluid in the pipe and a flow meter that measures the flow rate of the fluid in the pipe, and based on the water level value from the water level meter and the flow value from the flow meter, An inflow amount predicting device that predicts an inflow amount is known.
[0006]
However, the actual situation is that an inflow amount prediction device that predicts the inflow amount of fluid in consideration of whether the flow state of the fluid in the pipe rod is a flowing state or a storage state has not been developed.
[0007]
The present invention has been made in consideration of such points, and in consideration of whether the flow state of the fluid in the pipe tube is a flow-down state or a storage state, the water level value from the water level meter and the flow rate detection means It is an object of the present invention to provide an inflow amount prediction device capable of accurately predicting a fluid inflow amount on the basis of a flow rate value from.
[0008]
[Means for Solving the Problems]
The present invention relates to a water level gauge for measuring the fluid level in a pipe culvert or an open channel, and a water level meter for measuring the fluid level in the pipe culvert or an open channel. Based on the flow rate detection means for determining the flow rate of the fluid in the tub and the water level value from the water level gauge, the cross-sectional area calculated based on the water level value is multiplied by the average flow velocity of the fluid calculated based on the water level value. A prediction calculation unit that calculates an ideal value of the flow rate of the fluid that serves as a reference for determining the flow state and predicts the fluid inflow amount, and the prediction calculation unit detects the ideal value of the calculated flow rate and the flow rate detection When the deviation of the flow rate value from the means is calculated, and the calculated deviation is within a preset range, it is determined that the flow state is the flow-down state, and the prediction calculation formula for the preset flow-down state The water level value from the water level gauge and the flow rate value from the flow rate detection means Based on the fluid inflow amount, and when the deviation between the calculated ideal value of the flow rate and the flow rate value from the flow rate detection means is outside the preset range, it is determined that the flow state is the storage state. An inflow rate predicting device for predicting a fluid inflow rate based on a water level value from a water level meter and a flow rate value from a flow rate detecting means, using a preset calculation formula for a storage state It is.
[0009]
According to the present invention, the accuracy of prediction of the fluid inflow amount is improved by determining whether the flow state in the pipe culvert or open channel is a flow-down state or a storage state, and using a prediction calculation formula adapted to the fluid flow state. Can be made.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the inflow amount prediction apparatus according to the present invention will be described with reference to FIG.
[0011]
FIG. 1 is a diagram showing an embodiment of an inflow amount prediction apparatus according to the present invention.
[0012]
As shown in FIG. 1, an inflow amount prediction device 15 according to the present invention is provided at an upper portion in a pipe rod 13, and includes a water level meter 2 that measures the water level of a fluid 14 in the tube rod 13, and a fluid in the tube rod 13. 14 is provided with a flow rate detection means 20 for obtaining a flow rate of 14, and a calculation unit 5 that performs calculation based on signals from the water level meter 2 and the flow rate detection means 20.
[0013]
Among these, the flow rate detection means 20 is provided with a pair of flowmeters 1 and 1 which are provided in the lower part of the tube rod 13 and measure the flow velocity of the fluid 14 in the tube rod 13, and the flow velocity value and the water level meter of the fluid from each flowmeter 1. 2 and a flow rate calculation unit 5f, which will be described later, for calculating the flow rate of the fluid based on the water level value of the fluid.
[0014]
The calculation unit 5 includes a signal conversion unit 5a that converts signals sent from the water level meter 2 and the pair of velocimeters 1 and 1, a signal output unit 5b that outputs a signal to the monitoring unit 8 described later, and a fluid inflow amount. A setting unit 5c for setting a setting value for predicting the ideal value, an ideal value calculation unit 5d for calculating an ideal value of the flow rate based on a signal from the signal conversion unit 5a, and an ideal value of the flow rate from the ideal value calculation unit 5d And a determination unit 5e that determines the flow state of the fluid 14 based on the flow rate value from the flow rate detection means 20 and predicts the fluid inflow amount, and the flow rate calculation unit 5f described above. And each part 5a, 5b, 5c, 5d, 5e, 5f of the calculating part 5 is mutually connected.
[0015]
The calculation unit 5 calculates the ideal value of the flow rate of the fluid 14 as a reference for obtaining the flow state based on the signal from the signal conversion unit 5a, and predicts calculation units 5a, 5b, 5c, 5d and 5e and the flow rate calculation unit 5f described above.
[0016]
As described above, the pair of velocimeters 1, 1 are connected to the signal conversion units 5 a of the prediction calculation units 5 a, 5 b, 5 c, 5 d, 5 e through the corresponding cables 3, 3. Thus, the signal conversion units 5a of the prediction calculation units 5a, 5b, 5c, 5d, and 5e are connected.
[0017]
Here, as the anemometer 1, an ultrasonic Doppler type anemometer that emits ultrasonic waves to particles and measures the difference between the transmission frequency and the reflected frequency of the reflected ultrasonic waves to obtain the flow velocity is used.
[0018]
As the water level meter 2, an ultrasonic pulse propagation time difference type water level meter is used to measure the time difference from transmission to reception of ultrasonic waves to obtain the water level.
[0019]
An external terminal 7 is connected to the setting units 5c of the prediction calculation units 5a, 5b, 5c, 5d, and 5e via the cable 10, and power is supplied to the calculation unit 5 via the cable 9. A power source 6 is connected.
[0020]
As described above, the monitoring unit 8 is connected to the signal output unit 5b and the setting unit 5c of the prediction calculation units 5a, 5b, 5c, 5d, and 5e via the cables 11 and 12, and the monitoring unit 8 includes a pump and A control unit 16 for controlling the inflow gate is connected.
[0021]
Next, the operation of the embodiment having such a configuration will be described.
[0022]
As shown in FIG. 1, the pair of velocimeters 1, 1 measure the flow velocity of the fluid 14 in the pipe rod 13, and predict the calculation units 5 a, 5 b, via the corresponding cables 3, 3. It transmits to the signal converter 5a of 5c, 5d, 5e. Moreover, the water level meter 2 measures the water level of the fluid 14 in the pipe rod 13, and transmits the water level value to the signal conversion unit 5a of the prediction calculation units 5a, 5b, 5c, 5d, and 5e via the cable 4.
[0023]
The signal conversion unit 5a of the prediction calculation units 5a, 5b, 5c, 5d, and 5e performs signal conversion on the transmitted flow velocity value and water level value, and the flow rate calculation unit of the flow rate detection means 20 uses the converted flow velocity value and water level value. To 5f. Further, the signal conversion unit 5a of the prediction calculation units 5a, 5b, 5c, 5d, and 5e sends the signal-converted water level value to the ideal value calculation unit 5d and the determination unit 5e of the prediction calculation units 5a, 5b, 5c, 5d, and 5e. Send.
[0024]
Further, the setting unit 5c of the prediction calculation units 5a, 5b, 5c, 5d, and 5e uses the preset water channel shape of the pipe rod 13, the roughness coefficient in the pipe rod 13, and the value of gravity acceleration as the flow rate of the flow rate detecting means 20. It transmits to the ideal value calculating part 5d of the calculating part 5f and the prediction calculating parts 5a, 5b, 5c, 5d, and 5e.
[0025]
The water channel shape of the pipe rod 13, the roughness coefficient in the pipe rod 13, and the value of the gravitational acceleration are set in advance in the setting unit 5c of the prediction calculation units 5a, 5b, 5c, 5d, and 5e. Settings can be freely changed from the monitoring unit 8 via the cables 10 and 12.
[0026]
The flow rate calculation unit 5f of the flow rate detection means 20 includes the water level value transmitted from the signal conversion unit 5a of the prediction calculation units 5a, 5b, 5c, 5d, and 5e and the setting units of the prediction calculation units 5a, 5b, 5c, 5d, and 5e. Based on the water channel shape of the tube rod 13 transmitted from 5c, the diameter depth value of the tube rod 13 is calculated, the calculated diameter depth value of the tube rod 13, the prediction calculation units 5a, 5b, 5c, 5d, 5e Based on the roughness coefficient and gravity acceleration value in the pipe rod 13 transmitted from the setting unit 5c, the coefficient Ar is calculated using the following arithmetic expression (1).
[0027]
[Expression 1]

Here, each symbol in the above equation (1) and the following equation (2) is set as follows.
n: Roughness coefficient in pipe tub R: Diameter depth of pipe tub (value that varies depending on channel shape and water level)
y: Water level value sent from the signal converter (point velocity measurement water depth)
g: Gravity acceleration Ar: coefficient
Next, the flow rate calculation unit 5f of the flow rate detection unit 20 calculates the coefficient Ar calculated in the calculation formula (1), the water level value from the signal conversion unit 5a of the prediction calculation units 5a, 5b, 5c, 5d, and 5e. Based on the depth value of the tube rod 13 and the roughness coefficient and gravity acceleration value in the tube rod 13 transmitted from the setting unit 5c of the prediction calculation units 5a, 5b, 5c, 5d and 5e, the following calculation formula ( 2) is used to calculate the correction coefficient Kp.
[0029]
[Expression 2]

[0030]
Although the correction coefficient Kp is calculated using the arithmetic expressions (1) and (2), the correction coefficient Kp is calculated based on a correction coefficient curve that takes into account the generation position of the maximum flow velocity of the fluid 14 in the pipe rod 13. Also good.
[0031]
As shown in FIG. 2, the flow rate calculation unit 5f of the flow rate detection means 20 is based on the calculated correction coefficient Kp and the flow velocity value transmitted from the signal conversion units 5a of the prediction calculation units 5a, 5b, 5c, 5d, and 5e. Then, the average flow velocity of the fluid 14 in the pipe rod 13 is calculated using the calculation formula (3) (calculation a).
[0032]
Va = Kp · Vp (3)
[0033]
Here, each symbol in the arithmetic expression (3) is set as follows.
Va: Average flow velocity of the fluid in the pipe rod Vp: Flow velocity value (point flow velocity) transmitted from the signal converter
[0034]
The flow rate calculation unit 5f of the flow rate detection unit 20 calculates the cross-sectional area of the fluid 14 based on the water level value transmitted from the signal conversion unit 5a of the prediction calculation units 5a, 5b, 5c, 5d, and 5e (calculation b). The flow rate of the fluid 14 is calculated (calculation d) by multiplying the calculated cross-sectional area of the fluid 14 by the calculated average flow velocity (calculation c). The calculated flow rate is transmitted to the determination units 5e of the prediction calculation units 5a, 5b, 5c, 5d, and 5e.
[0035]
Further, the ideal value calculation unit 5d of the prediction calculation units 5a, 5b, 5c, 5d, and 5e includes the water level value transmitted from the signal conversion unit 5a of the prediction calculation units 5a, 5b, 5c, 5d, and 5e, and the calculated pipe. Based on the depth value of the flange 13, the gradient value of the tube rod 13 and the roughness coefficient in the tube rod 13 transmitted from the setting unit 5c of the prediction calculation units 5a, 5b, 5c, 5d, and 5e, the calculation formula (4 ) (Manning equation) is used to calculate the average flow velocity of the fluid 14 (calculation e).
[0036]
Here, the gradient value of the pipe rod 13 is set in advance in the setting unit 5c of the prediction calculation units 5a, 5b, 5c, 5d, and 5e, but by the external terminal 7 or the monitoring unit 8 via the cables 10 and 12, Settings can be changed freely.
[0037]
[Equation 3]

[0038]
Here, each symbol in the above equation (4) is set as follows.
n: Roughness coefficient in pipe tub R: Diameter depth of pipe tub (value that varies depending on channel shape and water level)
I: Pipe gradient [0039]
Next, the ideal value calculation unit 5d of the prediction calculation units 5a, 5b, 5c, 5d, and 5e is based on the water level value transmitted from the signal conversion unit 5a of the prediction calculation units 5a, 5b, 5c, 5d, and 5e. Is calculated (calculation f), and the calculated cross-sectional area of the fluid 14 is multiplied by the calculated average flow velocity of the fluid 14 (calculation g) to calculate an ideal value of the flow rate (calculation h). The calculated ideal value of the flow rate is transmitted to the determination units 5e of the prediction calculation units 5a, 5b, 5c, 5d, and 5e.
[0040]
The determination unit 5e of the prediction calculation units 5a, 5b, 5c, 5d, and 5e includes the ideal value of the flow rate transmitted from the ideal value calculation unit 5d of the prediction calculation units 5a, 5b, 5c, 5d, and 5e and the flow rate detection unit 20. A deviation of the flow rate value (actually measured value) transmitted from the flow rate calculation unit 5f is calculated, and it is determined whether or not the calculated deviation is within a preset range (calculation i).
[0041]
Here, the preset range (setting range) is set in the setting unit 5c of the prediction calculation units 5a, 5b, 5c, 5d, and 5e, and the ideal value calculation unit 5d of the prediction calculation units 5a, 5b, 5c, 5d, and 5e. 10% of the ideal value of the flow rate transmitted from is set, but the setting can be freely changed via the cables 10 and 12 by the external terminal 7 or the monitoring unit 8. The setting range set in the setting unit 5c of the prediction calculation units 5a, 5b, 5c, 5d, and 5e is transmitted to the determination unit 5e of the prediction calculation units 5a, 5b, 5c, 5d, and 5e.
[0042]
As shown in FIG. 3, when the ideal flow state (equal flow) in the pipe rod 13 continues, the actually measured value (plot x) and the ideal value a substantially coincide (c). If the ideal flow is hindered by some influence, the actual measurement value (plot x) deviates from the ideal value a (d). Here, a range between the broken line part b and the ideal value a is set as a preset range e.
[0043]
In FIG. 3, the vertical axis indicates the flow rate of the fluid 14 in the pipe rod 13, and the horizontal axis indicates the water level of the fluid 14 in the pipe rod 13.
[0044]
In FIG. 4, the determination unit 5e of the prediction calculation units 5a, 5b, 5c, 5d, and 5e has the flow rate transmitted from the ideal value calculation unit 5d of the prediction calculation units 5a, 5b, 5c, 5d, and 5e as described above. The deviation between the ideal value and the flow rate value (actual value) transmitted from the flow rate calculation unit 5f of the flow rate detection means 20 is calculated (Step 1).
[0045]
Next, the determination unit 5e of the prediction calculation units 5a, 5b, 5c, 5d, and 5e determines that the flow state is a flowing-down state when the calculated deviation is within a preset range (Step 2). When the determination unit 5e of the prediction calculation units 5a, 5b, 5c, 5d, and 5e determines that the flow state is the flow-down state, a prediction calculation formula for the flow-down state that is set in advance is used (Step 3), and the prediction calculation unit 5a, Based on the water level value from the signal conversion unit 5a of 5b, 5c, 5d, and 5e and the flow rate value from the flow rate calculation unit 5f of the flow rate detection means 20, the fluid inflow amount after a predetermined time (n minutes later) is predicted. (Step 4). On the other hand, the determination unit 5e of the prediction calculation units 5a, 5b, 5c, 5d, and 5e determines that the flow state is the storage state when the calculated deviation is outside the preset range (Step 2). When the determination unit 5e of the prediction calculation units 5a, 5b, 5c, 5d, and 5e determines that the flow state is the storage state, the prediction calculation unit 5a is performed using a preset prediction calculation formula for the storage state (Step 3a). Based on the water level value from the signal conversion unit 5a of 5b, 5c, 5d, and 5e and the flow rate value from the flow rate calculation unit 5f of the flow rate detection means 20, the fluid inflow amount after a lapse of a certain time (after n minutes) is calculated. Prediction (Step 4).
[0046]
Here, the predetermined time (n minutes) is set in advance in the setting unit 5c of the prediction calculation units 5a, 5b, 5c, 5d, and 5e, but from the external terminal 7 or the monitoring unit 8 via the cables 10 and 11 The setting can be changed freely.
[0047]
The determination unit 5e of the prediction calculation units 5a, 5b, 5c, 5d, and 5e transmits the predicted fluid inflow amount to the signal output unit 5b of the prediction calculation units 5a, 5b, 5c, 5d, and 5e, and the prediction calculation unit 5a, The signal output units 5b of 5b, 5c, 5d, and 5e transmit the transmitted fluid inflow amount to the monitoring unit 8 via the cable 11. The monitoring unit 8 transmits the transmitted fluid inflow amount to the control unit 16 via the cable 17, and the control unit 16 calculates the control amount of the pump and the inflow gate based on the value of the transmitted fluid inflow amount. (Step 5). The control unit 16 controls the pump and the inflow gate with the calculated control amount (Step 6).
[0048]
In addition, although the fluid inflow amount is predicted in the determination unit 5e of the prediction calculation units 5a, 5b, 5c, 5d, and 5e, the monitoring unit 8 may predict the fluid inflow amount.
[0049]
Next, a modified example of the present invention will be described.
[0050]
The prediction operation units 5a, 5b, 5c, 5d, and 5e are connected to ground rain gauges that measure rainfall. The determination units 5e of the prediction operation units 5a, 5b, 5c, 5d, and 5e receive rainfall from the ground rain gauges. The amount of fluid inflow may be predicted by further taking into account the value of and the information on the rainfall radar input from the external terminal 7 or the monitoring unit 8.
[0051]
【The invention's effect】
According to the present invention, the accuracy of prediction of the fluid inflow amount is improved by determining whether the flow state in the pipe culvert or open channel is a flow-down state or a storage state, and using a prediction calculation formula adapted to the fluid flow state. Can be made.
[0052]
In addition, since the accuracy of prediction of the fluid inflow rate can be improved with a simple configuration, the cost can be kept lower than that of the inflow amount prediction device that predicts the fluid inflow rate using a rainfall radar.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing an embodiment of an inflow amount prediction apparatus according to the present invention. FIG. 2 is a diagram showing a method for calculating an actual flow rate value and an ideal value. FIG. FIG. 4 is a diagram showing the flow rate calculated by the Manning equation.
DESCRIPTION OF SYMBOLS 1 Flowmeter 2 Water level meter 5 Calculation part 5a Signal conversion part 5b Signal output part 5c Setting part 5d Ideal value calculation part 5e Determination part 5f Flow rate calculation part 7 External terminal 8 Monitoring part 15 Inflow amount prediction apparatus 20 Flow rate detection means

Claims (4)

In the inflow prediction device that measures the fluid flowing in the pipe or open channel and predicts the fluid inflow,
A water level meter that measures the water level of the fluid in the pipe or open channel;
A flow rate detecting means for determining the flow rate of the fluid in the pipe or open tube,
Based on the water level value from the water level meter, the cross-sectional area calculated based on the water level value is multiplied by the average flow velocity of the fluid calculated based on the water level value. A calculation unit that calculates an ideal value of the fluid and predicts the fluid inflow amount,
The prediction calculation unit calculates a deviation between the calculated ideal value of the flow rate and the flow rate value from the flow rate detection means, and when the calculated deviation is within a preset range, the flow state is a downflow state. Determine the fluid inflow amount based on the water level value from the water level gauge and the flow rate value from the flow rate detection means using the preset calculation formula for the flow state, and calculate the ideal value of the flow rate. And the flow rate value from the flow rate detection means is outside the preset range, it is determined that the flow state is the storage state, and using a preset calculation formula for the storage state, An inflow rate predicting apparatus for predicting a fluid inflow rate based on a water level value from a water level meter and a flow rate value from a flow rate detecting means.   The flow rate detection means is a flowmeter that measures the flow rate of the fluid in the pipe or open channel, and a flow rate calculation that calculates the flow rate of the fluid based on the flow rate value of the fluid from the flow meter and the water level value of the fluid from the water level meter The inflow amount prediction apparatus according to claim 1, further comprising:   The inflow amount prediction device according to claim 2, wherein the flow rate calculation unit obtains an average flow rate by multiplying a fluid flow rate value from the anemometer by a correction coefficient, and calculates the fluid flow rate using the average flow rate. .   The inflow amount prediction apparatus according to claim 1, wherein the prediction calculation unit calculates an ideal value of the fluid flow rate by a Manning equation.

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