CN110146061B - Large-scale falling object positioning method for long-distance low-flow-rate water delivery open channel - Google Patents

Large-scale falling object positioning method for long-distance low-flow-rate water delivery open channel Download PDF

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CN110146061B
CN110146061B CN201910477252.6A CN201910477252A CN110146061B CN 110146061 B CN110146061 B CN 110146061B CN 201910477252 A CN201910477252 A CN 201910477252A CN 110146061 B CN110146061 B CN 110146061B
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head
tail
wave
water level
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CN110146061A (en
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杨明祥
王浩
蒋云钟
权锦
甘治国
刘珂
董宁澎
刘璇
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China Institute of Water Resources and Hydropower Research
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C13/00—Surveying specially adapted to open water, e.g. sea, lake, river or canal
    • G01C13/002—Measuring the movement of open water
    • G01C13/006—Measuring the movement of open water horizontal movement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C13/00—Surveying specially adapted to open water, e.g. sea, lake, river or canal
    • G01C13/008—Surveying specially adapted to open water, e.g. sea, lake, river or canal measuring depth of open water

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Abstract

The invention discloses a long-distance low-flow-speed water delivery large-scale falling object positioning method, which relates to the technical field of hydraulic engineering fault diagnosis and comprises the following steps of: s1, observing long-distance water delivery canalAn abnormal change in water level of the track; s2, recording the time t when the water level fluctuation occurs at the head and the tail of the canalHead、tTail(ii) a S3, calculating the average wave velocity v of water waves in the water delivery channel according to the diving wave velocity equationWave (wave)(ii) a And S4, calculating the falling object position L by adopting a calculation formula. The method can position the large-scale falling object only by utilizing the water level data monitored by the canal head water level gauge and the canal tail water level gauge in real time, and can quickly determine the positioning of the large-scale falling object of the long-distance low-flow-rate water delivery open canal.

Description

Large-scale falling object positioning method for long-distance low-flow-rate water delivery open channel
Technical Field
The invention relates to the technical field of hydraulic engineering fault diagnosis, in particular to a large-scale drop positioning method for a long-distance low-flow-rate water delivery open channel.
Background
The long-distance water delivery open channel is far away from the channel end due to the fact that the channel head is far away from the channel end, the water surface of the channel is open to the outside, the channel is usually excavated along a highway, and channel-crossing buildings such as bridges are often arranged above the channel. This results in that inevitably large objects fall into the channel during daily operation, such as bridges and large vehicles running around the channel, etc., thereby causing clogging and contamination of the channel water. Therefore, the key for guaranteeing the normal operation of the channel is to find large falling objects in time and quickly locate the falling positions. At present, no automatic mode exists for positioning large falling objects of long-distance water delivery open channels, and the positioning is generally carried out by adopting a manual inspection mode. The mode of artifical patrolling and examining wastes time and energy, and can not acquire the thing information that weighs down the very first time, and the ageing is relatively poor.
Aiming at the problems, the invention provides a set of calculation method, and the position of the large falling object can be positioned only by utilizing water level data monitored by the canal head water level meter and the canal tail water level meter in real time.
Disclosure of Invention
The invention aims to provide a method for positioning a large falling object for long-distance low-flow-rate water delivery, thereby solving the problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a long-distance low-flow-speed water delivery large-scale falling object positioning method comprises the following steps:
s1, observing the abnormal change of the water level of the long-distance water delivery channel;
s2, recording the time t when the water level fluctuation occurs at the head and the tail of the canalHead、tTail；
S3, calculating the average wave velocity v of water waves in the water delivery channel according to the diving wave velocity equationWave (wave)；
And S4, calculating the falling object position L by adopting a calculation formula.
Preferably, step S1 specifically includes:
s11, if the water level changes abnormally, the flow goes to step S2; if the water level is not abnormally changed, the process goes to S12;
s12, recording the head water depth hHeadAnd the depth h of the tail water of the canalTail；
S13, recording the water flow velocity v of the channelWater (W)The water level abnormal change is observed again, and step S11 is repeated.
Preferably, the diving wave velocity equation in step S3 includes (1) to (2):
Figure BDA0002082667890000021
Figure BDA0002082667890000022
vwave (wave)The wave velocity of shallow water waves caused by large falling objects; h isHeadThe depth of the canal head water is unit (meter); h isTailThe depth of the tail water of the canal is unit (meter); h is the average depth of the ditch pool, and is calculated by a formula (2) and is in a unit of meter; g is the acceleration of gravity, and is a constant in m2/s。
Preferably, the head water depth hHeadReading the water depth h of the tail end of the canal by a canal head water level monitorTailAnd reading the water level in the tail water level monitor.
Preferably, the calculation formula in step S4 includes (3) to (5):
S＝t1×(vwave (wave)-vWater (W))+t2×(vWave (wave)+vWater (W)) (3)
L＝t1×(vWave (wave)-vWater (W)) (4)
t2-t1＝tTail-tHead (5)
Wherein S is the total channel length t1The time it takes for water waves caused by a falling object to propagate to the head of the canal; t is t2Time taken for water waves caused by falling objects to propagate to the end of the canal, vWave (wave)The wave velocity of shallow water waves caused by large falling objects; v. ofWater (W)Is the water flow velocity in the channel; l is the length of the falling object from the head of the channel; t is tTailThe time when the water level of the tail end of the channel starts to change abnormally, namely the time when the water level of the tail end of the channel starts to rise or fall steeply; t is tHeadThe time when the head water level starts to change abnormally, i.e., the time when the head water level starts to rise or fall steeply.
Preferably, t isTailReading from a channel tail water level monitor, namely, the time when the channel tail water level starts to rise or fall steeply; t is tHeadReading from the head water level monitor, namely the time when the head water level starts to rise or fall steeply.
The invention has the beneficial effects that:
the invention discloses a method for positioning a large falling object in long-distance low-flow-rate water delivery, which can be used for positioning the large falling object in a long-distance low-flow-rate water delivery open channel only by using water level data monitored by a channel head water level gauge and a channel tail water level gauge in real time.
Drawings
FIG. 1 is a flow chart of a method for positioning a large-sized falling object in water delivery at a low flow rate over a long distance in embodiment 1;
FIG. 2 is a schematic diagram of the calculation of the position of a large-scale falling object for long-distance low-flow-rate water delivery.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Examples
The embodiment provides a large-scale falling object positioning method for long-distance low-flow-rate water delivery, and in order to monitor water level changes, automatic water level monitoring devices are installed at the head and tail parts of a current water delivery ditch pool, so that changes of water levels can be acquired in real time. In order to monitor the change of the water flow velocity of the channel, a corresponding speed measuring device is also arranged in the channel. The invention is only suitable for positioning large falling objects of the low-flow-rate water delivery channel pool, wherein the low flow rate means that the water flow speed is far lower than the wave speed caused by the large falling objects, the channel water surface can be treated according to the still water surface, and the channel water flow speed can be treated according to the uniform speed. Based on the above situation, the process of identifying the position of the falling object in the invention is shown in fig. 1, and comprises the following steps:
s1, observing the abnormal change of the water level of the long-distance water delivery channel;
s11, if the water level changes abnormally, the flow goes to step S2; if the water level is not abnormally changed, the process goes to S12;
s12, recording the head water depth hHeadAnd the depth h of the tail water of the canalTail；
S13, recording the water flow velocity v of the channelWater (W)And observing the water level abnormal change again.
S2, recording the time t when the water level fluctuation occurs at the head and the tail of the canalHead、tTail；
S3, calculating the average wave velocity v of water waves in the channel according to the diving wave velocity equationWave (wave)；
And S4, calculating the falling object position L by adopting a calculation formula.
The calculation formula comprises (1) to (5):
Figure BDA0002082667890000031
Figure BDA0002082667890000032
S＝t1×(vwave (wave)-vWater (W))+t2×(vWave (wave)+vWater (W)) (3)
L＝t1×(vWave (wave)-vWater (W)) (4)
t2-t1＝tTail-tHead (5)
Wherein, according to the depth h of the head and tail of the canalHead、hTailTime t of fluctuation of water level at head and tail of canalHead、tTailFig. 2 shows a schematic diagram of calculating the position of a falling object in a channel.
S is the total length of the channel, which is a known quantity and unit (meter); t is t1The time taken for the water wave caused by the falling object to propagate to the head of the canal is an unknown quantity, in units of seconds; t is t2The time taken for the water wave caused by a falling object to propagate to the end of the canal is an unknown quantity, in units of seconds; v. ofWave (wave)The wave velocity of shallow water waves caused by a large falling object can be calculated by the formulas (1) and (2) in units of meters per second; v. ofWater (W)Reading from a channel flow rate monitor for the water flow rate in the channel, which can be considered as a known quantity, in meters per second; l is the length of the falling object from the head of the channel, and is a known quantity in meters; t is tTailReading the time when the channel tail water level starts to change abnormally from a channel tail water level monitor, namely the time when the channel tail water level starts to rise or fall steeply; t is tHeadReading the time when the head water level starts to change abnormally from a head water level monitor, namely the time when the head water level starts to rise or fall sharply; h isHeadReading the head water depth from a head water level monitor in units of meters; h isTailReading the water depth of the tail water of the canal from a water level monitor of the tail water of the canal in a unit of meter; h is the average depth of the water in the ditch poolThe formula (5) is calculated to obtain the unit of meter; g is the acceleration of gravity, and is a constant in m2/s。
In this embodiment, if the length S of the canal pool is 2000 m, a vehicle crash event occurs, and the time when the water level monitoring meters at the head and the tail of the canal monitor the change of the water level is tHead＝2019-01-01 13:20:15，tTail2019-01-0113:20:55, namely, at an interval of delta t of 40 seconds, when the head water depth hHead3.9 m, depth h of tail waterTail4.1 m, flow velocity v of canal waterWater (W)0.25 m/s, the combined calculation can be performed according to the equations (1) to (5)
Figure BDA0002082667890000041
Figure BDA0002082667890000042
H is 4 m, delta t is 40S, S is 2000 m, g is 9.8 m2Second, vWater (W)The above equation is substituted for 0.25 m/s, and L is calculated to be 845.06 m. I.e. the position where the vehicle falls into the canal pit, is 835.06 meters away from the canal head.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained:
the invention discloses a method for positioning a large falling object in long-distance low-flow-rate water delivery, which can be used for positioning the large falling object in a long-distance low-flow-rate water delivery open channel only by using water level data monitored by a channel head water level gauge and a channel tail water level gauge in real time.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.

Claims (1)

1. A long-distance low-flow-speed water delivery large-scale falling object positioning method is characterized by comprising the following steps:
s1, observing the abnormal change of the water level of the long-distance water delivery channel;
s2, recording the time t when the water level fluctuation occurs at the head and the tail of the canalHead、tTail；
S3, calculating the average wave velocity v of the water waves in the water delivery channel according to the shallow water wave velocity equationWave (wave)；
S4, calculating the falling object position L by adopting a calculation formula;
step S1 specifically includes:
s11, if the water level changes abnormally, the flow goes to step S2; if the water level is not abnormally changed, the process goes to S12;
s12, recording the head water depth hHeadAnd the depth h of the tail water of the canalTail；
S13, recording the water flow velocity v of the channelWater (W)Observing the water level abnormal change again, and repeating the step S11;
the shallow water wave velocity equation in step S3 includes (1) to (2):
Figure FDA0002929124940000011
Figure FDA0002929124940000012
vwave (wave)The wave velocity of shallow water waves caused by large falling objects; h isHeadThe depth of the canal head water is unit (meter); h isTailThe depth of the tail water of the canal is unit (meter); h is the average depth of the ditch pool, and is calculated by a formula (2) and is in a unit of meter; g is the acceleration of gravity, and is a constant in m2/s；
The calculation formula in step S4 includes (3) to (5):
S＝t1×(vwave (wave)-vWater (W))+t2×(vWave (wave)+vWater (W)) (3)
L＝t1×(vWave (wave)-vWater (W)) (4)
t2-t1＝tTail-tHead (5)
Combining the formulae (1) to (5) to obtain
Figure FDA0002929124940000013
Wherein S is the total channel length t1The time it takes for water waves caused by a falling object to propagate to the head of the canal; t is t2Time taken for water waves caused by falling objects to propagate to the end of the canal, vWave (wave)The wave velocity of shallow water waves caused by large falling objects; v. ofWater (W)Is the water flow velocity in the channel; l is the length of the falling object from the head of the channel; t is tTailThe time when the water level of the tail end of the channel starts to change abnormally, namely the time when the water level of the tail end of the channel starts to rise or fall steeply; t is tHeadThe time when the head water level starts to change abnormally, i.e. the time when the head water level starts to rise or fall sharply, [ delta ] t ═ tTail-tHead；
Depth h of the canal headHeadReading the water depth h of the tail end of the canal by a canal head water level monitorTailReading the water level through a channel tail water level monitor;
ttailReading from a channel tail water level monitor, namely, the time when the channel tail water level starts to rise or fall steeply; t is tHeadReading from the head water level monitor, namely the time when the head water level starts to rise or fall steeply.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0861952A (en) * 1994-08-23 1996-03-08 Tech Res & Dev Inst Of Japan Def Agency Underwater navigation body, measuring buoy station, measuring device, and position measuring method and device for the body
CN104654024A (en) * 2015-02-12 2015-05-27 常州大学 Method for locating and analyzing leakage of city gas pipeline based on GRNN (Generalized Regression Neural Network)
JP2019035677A (en) * 2017-08-17 2019-03-07 株式会社 拓和 Underwater distance observation device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0861952A (en) * 1994-08-23 1996-03-08 Tech Res & Dev Inst Of Japan Def Agency Underwater navigation body, measuring buoy station, measuring device, and position measuring method and device for the body
CN104654024A (en) * 2015-02-12 2015-05-27 常州大学 Method for locating and analyzing leakage of city gas pipeline based on GRNN (Generalized Regression Neural Network)
JP2019035677A (en) * 2017-08-17 2019-03-07 株式会社 拓和 Underwater distance observation device

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