KR20080038743A - Apparatus of measuring temporal variation of local scour depth and bed elevation and method thereof - Google Patents

Abstract

An apparatus and a method for measuring time variation of local scour depth and bed elevation are provided to conveniently move a sound wave Doppler flow meter and a position adjustment device. An apparatus for measuring time variation of local scour depth and bed elevation includes a sound wave Doppler flow meter(10), and a position adjustment device(20) on which the sound wave Doppler flow meter is mounted. A mounting part is installed at the position adjustment device to stably fix the sound wave Doppler flow meter. An adjustment part is operated to move the flow meter. The adjustment part includes a lateral adjustment terminal and a vertical adjustment terminal. The position adjustment device is longitudinally moved by a plurality of wheels(23).

Description

Apparatus of measuring temporal variation of local scour depth and bed elevation And Method

1 is an exemplary configuration diagram for showing a measurement state conceptually implemented to explain the present invention;

Figure 2 is a schematic configuration diagram showing a plane of the position adjusting means being implemented in accordance with the present invention,

Figure 3 is a schematic view showing a configuration of one side of the position adjusting means being implemented in accordance with the present invention,

Figure 4 is an exemplary front view showing a mounting portion of the position adjusting means capable of fixing the sound wave Doppler flowmeter according to the present invention,

5 is an exemplary embodiment of the screen for showing the flow rate data measured using the acoustic wave Doppler flowmeter implemented by the present invention.

<Description of the code | symbol about the principal part of drawing>

10: sound wave Doppler flowmeter 20: position adjusting means

21: mounting portion 22: adjusting portion

22a: lateral adjustment stage 22b: vertical adjustment stage

23: wheels 24: instructions

30: data acquisition unit 40: microcomputer

50: rail

The present invention relates to a device for measuring the rate of change of scour depth and bed height with time and a measuring method using the same,

In more detail, the position adjusting means equipped with the acoustic wave Doppler flowmeter for measuring the flow velocity is installed on the upper part of the channel to accurately measure the scour depth or bed change rate while moving to the measuring point in the longitudinal and transverse directions accurately. By using the rate of change to predict the scour depth that can occur in the field considering the effects of time change due to rainfall or flood events, the experimenter and user who performs a hydraulic model test to use it as a means to extract data for the design of bridge structures. The present invention relates to a device for measuring the rate of change of scour depth and river bed height over time to maximize the reliability and satisfaction of use and a measuring method using the same.

In general, in laboratory or field scour studies, the change in scour depth in time-varying rainfall intensity or the quantity of runoff of flood events is an important concern.

Therefore, in the previous studies, the study focused on the measurement of the final scour depth after the completion of the hydraulic experiment. As a result, the scrubbing depth prediction formulas based on the final scrubbing depth data measured in the laboratory are almost more than necessary. The overly predicted scour depth is to generate time and economic damage during the construction of bridges and shifts in the field.

That is, the scour depths and bed changes around the piers change little by little in the surface water, but in the case of heavy rainfall or flood events, many bed changes occur that can cause damage such as piers collapse in a relatively short time.

Therefore, it is important to predict the scour depth with sufficient consideration of the rate of change of scour depth, which can be the basis for stable and economical design and construction.In order to do so, it is important to measure the scour depth or bed change rate at regular intervals during the scour process. Do.

However, since the conventional scour depth study focused on the final scour depth reached the equilibrium state, there is a problem that the accuracy of the scour depth prediction occurring in a relatively short time such as torrential rain or flood accident in the field is inferior. This is because the scour depth prediction used in the field is calculated by measuring only the final scour depth at which the equilibrium state is reached. Therefore, there is a problem that the stability and economic efficiency are reduced by generating an error.

Therefore, due to the problems described above, the conventional scour depth is limited in its efficiency, such as inadequately stable and economical design and construction of the piers. Due to the prediction of, there is always a problem that the reliability and satisfaction of the scour depth experiment carried out through this.

The present invention has been made to solve the problems of the prior art as described above has the following object.

The present invention more easily and accurately measure the change in scour depth or bed phase with time at nearly the same time zone at various points around the piers using a sonic Doppler flowmeter and position control means in a scour depth model experiment using a numerical test apparatus. To provide a method for measuring the rate of change of scour depth and bed height over time and a method of measuring using the same, which contribute to minimizing and improving the accuracy of the measured experimental results, thereby contributing to suggesting a highly adaptive scour depth prediction formula. There is this.

Another object of the present invention is to improve the convenience of movement to the acoustic wave Doppler flowmeter and the position adjusting means as a whole, and to improve the efficiency of the operation capable of precise position movement, and to use it as a means for extracting data for pier structure design. The present invention provides a device for measuring the rate of change of scour depth and river bed height over time and a measuring method using the same to allow the experimenter and the user to perform the model experiment to maximize the reliability and satisfaction in use.

Hereinafter, the present invention will be described in detail.

In describing the present invention, when it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Terms to be described later are set in consideration of functions in the present invention, which may vary depending on the intention or practice of the experimenter, the user, and the producer, and the definitions should be made based on the contents throughout the present specification.

Prior to explaining the present invention, the over-predicted scour depth may generate time and economic damage during construction of bridges or shifts in the field, and thus may help the scrubbing depth prediction formula and site design through more accurate measurement of scour depth change rate.

First, the time change rate measurement device for scour depth and bed height according to the time of the present invention uses a sound wave to measure the distance between the extraction volume and the bed phase, and to measure the flow rate, and a sound wave Doppler tachometer. A position adjusting means for easily shifting the position on the water channel, a data acquiring unit for easily acquiring the measured data connected to the acoustic wave Doppler flowmeter mounted to the position adjusting means, and connecting with the data acquiring unit. It will include a microcomputer to measure, record and store the extraction volume and the distance to the bottom of the channel using the acquired data.

Accordingly, the position adjusting means has a mounting portion for stably fixing the sonic Doppler tachometer, and the sonic Doppler tachometer fixed to the mounting portion to move to the point to be measured to obtain the data to adjust the horizontal Positioning means for easy movement along the rail provided in the upper portion of the channel and the control unit consisting of a horizontal direction adjusting end for adjusting in the direction (y-axis) and a vertical direction adjusting end for adjusting in the vertical direction (z-axis) It consists of a plurality of wheels installed at the bottom of the guide portion indicating the numerical value indicated on the tape measure is attached to the side of the waterway to indicate the distance in the longitudinal direction.

The method performed by the time change rate measurement device of scour depth and bed height according to the time carried out in the above is provided with a position adjusting means equipped with an acoustic wave Doppler flowmeter for measuring the flow velocity in the upper part of the waterway, so as to be accurate in the longitudinal and transverse directions. The scour depth or bed change rate is measured while moving to the measurement point, and the scour depth change rate is measured to estimate the scour depth that can be generated in the field in consideration of the influence of time change due to rainfall or flood events.

Accordingly, the step of stably fixing the sound wave Doppler tachometer to the mounting portion of the position adjusting means, the position adjusting means to which the sound wave Doppler tachometer is fixed to the position to measure the data using the control unit, and the position to be measured Measuring the distance to the extraction volume and the bottom of the water channel by operating the sonic Doppler flowmeter, which was initially recorded using the position adjusting means at a time required for measurement or at regular time intervals. Measuring the distance between the extracted volume and the bottom of the channel by precisely moving the position coordinates, and obtaining an accurate scour depth or time change rate using the interpolation method between the extracted volume and the bed phase recorded at a predetermined time interval. Will run.

In addition, during an experiment in which the acoustic wave Doppler tachometer is measured, the position adjustment means is moved to a place where the influence due to the acoustic wave Doppler tachometer is hardly affected by the change of the flow, and is connected to the acoustic wave Doppler tachometer. After acquiring the measured data through the data acquiring unit, the microcomputer connected to the data acquiring unit records and stores the extraction volume and the distance to the bottom of the channel, so as to accurately calculate the time change rate of scour depth or river bed.

In addition, the sound wave Doppler flowmeter is adjusted to be positioned by moving in the lateral direction (y-axis) by the lateral adjustment stage in order to move the fixed position adjusting means to the position to measure the data by using the control unit, the vertical direction It is adjusted to be positioned by moving in the vertical direction (z-axis) by the control end, it is to be carried out so that it can be positioned by moving in the longitudinal direction using the wheel installed in the lower end of the position adjusting means.

EXAMPLE

With reference to the accompanying drawings, a preferred embodiment for achieving the present invention will be described in detail.

First, the present invention is shown in the accompanying drawings, Figures 1 to 4, Figure 1 is a diagram showing the configuration for showing a measurement state conceptually carried out for explaining the present invention, Figure 2 is carried out in accordance with the present invention Exemplary configuration diagram schematically showing a plane of the position adjusting means that is being, Figure 3 is an exemplary configuration diagram schematically showing one side of the position adjusting means implemented according to the present invention, Figure 4 is a sound wave doppler by the present invention Exemplary front configuration for showing the mounting portion of the position adjusting means capable of fixing the flow meter is shown.

That is, in the present invention, the scour depth or bed change around the pier changes little by little at the time of water level, but when the heavy rain or flood event occurs, a lot of bed changes occur in a relatively short time, which causes severe damage such as pier collapse or loss of life. It is important to measure scour depth or bed change rate at regular time intervals during the scour process because it is very stable and economical to predict scour depth by fully considering the rate of change of scour depth over time. It can be used for the estimation of the scour depth.

To this end, in the apparatus for measuring the rate of change of scour depth and bed height according to time implemented by the present invention, the acoustic wave Doppler flowmeter 10 measures the distance between the extraction volume and the bed using sound waves and measures the flow velocity.

The position adjusting means 20 is used to stably measure by the sound wave Doppler tachometer 10. The position adjusting means 20 is equipped with a sound wave Doppler tachometer 10 to easily move the position on the channel. It is to be made.

Thus, the position adjusting means 20 is provided with a mounting portion 21, the mounting portion 21 is to stably fix the sound wave Doppler flowmeter 10.

The sound wave Doppler tachometer 10 fixed to the mounting portion 21 is moved to a point to be measured to acquire data, which is manipulated and adjusted by the adjuster 22 to enable position movement.

The adjusting part 22 is composed of a horizontal direction adjusting end 22a and a vertical direction adjusting end 22b, and is moved in the horizontal direction (y axis) by the operation of the horizontal direction adjusting end 22a. It can be adjusted, and at the same time it can be adjusted by moving the position in the vertical direction (z-axis) by the vertical direction adjusting end 22b.

In addition, the overall position adjusting means 20 can be easily moved in the longitudinal direction, which is a plurality of wheels 23 provided in the lower end of the position adjusting means 20 according to the rail 50 installed on the upper portion of the water channel It can be easily moved and made possible.

The longitudinal movement in the longitudinal direction is for the acoustic wave Doppler tachometer 10 to be positioned in the longitudinal direction, so that the longitudinal position of the acoustic wave Doppler tachometer 10 can be accurately specified in the longitudinal movement. It can be confirmed through the guide unit 24.

Thus, the guide portion 24 is to indicate the numerical value displayed on the tape measure attached to the side of the channel can accurately specify the longitudinal position of the acoustic wave Doppler flowmeter 10.

The acoustic wave Doppler flowmeter 10 mounted on the position adjusting means 20, which is implemented as described above, is interconnected with the data acquisition unit 30 at a predetermined distance, and the data acquisition unit 30 is the acoustic wave Doppler. The data measured through the tachometer 10 is easily obtained.

The data acquired through the data acquisition unit 30 is sent to the microcomputer 40 spaced apart from the predetermined distance, the microcomputer 40 measures the extraction volume and the distance to the bottom of the channel using the acquired data And recording and storing, and using the interpolation method, the distance between the extracted volume and the stored phase recorded above is obtained to obtain accurate scour depth or time change rate of the bed.

In addition, the present invention is to measure the scour depth or river bed change rate using the measuring device is carried out as described above, and using the scour depth change rate measured above to determine the field scrubbing depth that can be generated in consideration of the influence of time changes due to rainfall or flood events To predict.

To this end, the sound wave Doppler tachometer 10 is stably fixed to the mounting portion 21 of the position adjusting means 20, and then the position of the sound wave Doppler tachometer 10 mounted on the position adjusting means 20 is measured. In order to move the overall positioning means 20 to move in the longitudinal direction or by using the control unit 22 to move in the transverse direction and vertical direction.

At this time, after recording the coordinates of the exact position moved in the above, the sound wave Doppler flowmeter 10 is operated to measure the distance between the extraction volume and the bottom of the channel, and the measured data is acquired by the data acquisition unit 30. Then it is recorded through the microcomputer 40 and stored at the same time.

During the measurement experiment, the position adjusting means 20 is moved to a place where the influence due to the acoustic wave Doppler flowmeter 10 is hardly affected by the change of the flow, and the position is adjusted at a time required for measurement or at regular time intervals. After accurately moving to the initially recorded position coordinates by means of the means 20, the data of measuring the extracted volume and the distance to the bottom of the channel again are recorded and stored through the data acquisition unit 30 and the microcomputer 40. do.

Through the microcomputer 40 executed in the above, the distance between the extracted volume and the bed phase recorded at regular time intervals can be obtained using the interpolation method to obtain the correct scour depth or the bed time change rate.

5 is measured data displayed through the monitor of the microcomputer 40, which shows the flow velocity measured using the acoustic wave Doppler tachometer 10. FIG.

Before measuring the flow rate, the distance between the extraction volume and the bed is measured and stored using sound waves.

In this regard, the present invention uses the sound wave Doppler flowmeter 10 and the position adjusting means 20 while the scour is in progress to measure the scour depth at a predetermined time interval, and proceed to scour through the flow after the initial scour depth is measured. In order to minimize the influence on the process by using the position adjusting means 20 to move the sound wave Doppler tachometer 10 to the place without affecting the flow until the next measurement time, after a certain time the position adjusting means 20 Use to move exactly to the initial measurement position to measure the scour depth in the next time step.

At this time, it is considered that the equilibrium state is reached after a certain time with little change rate of scour depth, and the final scour depth is measured, and the scour depth or bed change rate is calculated after completion of the experiment by using the time-determined scour depth measurement data obtained during the experiment. Therefore, the scour depth change rate calculated above is to be used for more accurate and realistic model or site scour depth analysis and estimation formula.

Lastly, in the construction and implementation of the apparatus for measuring the time change rate of scour depth and bed height according to the time of carrying out the present invention, and the measuring method using the same, various modifications may be made.

It is to be understood, however, that the present invention is not limited to the specific forms referred to in the above description, but rather includes all modifications, equivalents and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

As described above, the present invention can be easily measured the scour depth or bed phase change of a predetermined time interval using the position adjusting means and the acoustic wave Doppler flowmeter has the effect of improving the accuracy and reliability for the experiment.

In addition, the present invention has the effect of having a very stable positioning in the longitudinal and transverse direction with the convenience to accurately move to the measuring point during each measurement of the position adjusting means and the acoustic wave Doppler flowmeter, and at the same time easy and quick In order to accurately measure the distance between the extraction volume and the bed phase, there is an effect of efficiently measuring scour depth or bed phase change rate.

In addition, the present invention can accurately install the acoustic wave Doppler flowmeter where it is needed by using the rail installed on the upper part of the water channel to extract the data for the design of scour depth prediction and pier structure design with excellent safety and economic feasibility There is a more efficient effect in the hydraulic model experiments used as a means for this.

In addition, the present invention has various effects, such as maximization of reliability and satisfaction by the experimenter and the user experimenting with the use because the efficiency of the use is improved by the convenience of the position movement and the exact position movement as a whole.

Claims (11)

An acoustic wave Doppler flowmeter for measuring the distance between the extracted volume and the bed phase using sound waves and for measuring the flow velocity; Position adjusting means for mounting the sound wave Doppler flowmeter to easily move the position on the water channel; Device for measuring the rate of change of scour depth and bed height according to time, characterized in that comprises a. The method of claim 1, Data extraction unit for easily acquiring the measured data connected to the sound wave Doppler flowmeter mounted on the position adjusting means, and measuring the extraction volume and the distance to the bottom of the channel using the acquired data connected to the data acquisition unit And a time varying rate measuring device for scour depths and bed heights according to time, further comprising a microcomputer for recording and storing. The method of claim 1, The position adjusting means includes a mounting portion for stably fixing the sonic Doppler tachometer, and an adjusting portion for adjusting the position by operating the sonic Doppler tachometer fixed to the mounting portion to move to a point to be measured to acquire data. A number of wheels installed at the lower end of the position adjusting means for easy movement along the rail installed on the upper part of the channel, and a guide part indicating the numerical value indicated on the tape measure attached to the side of the channel so as to indicate and confirm the longitudinal distance. Device for measuring the rate of change of scour depth and bed height according to time, characterized in that the configuration. The method of claim 3, The control unit comprises a transverse direction adjusting end for adjusting the position of the acoustic wave Doppler flowmeter fixed to the mounting portion in the transverse direction (y-axis), and a vertical direction adjusting end for adjusting in the vertical direction (z-axis) Apparatus for measuring the rate of change of scour depth and bed height with time. A sound wave Doppler tachometer for measuring the distance between the extraction volume and the lower bed using sound waves and for measuring the flow velocity, and a position adjusting means for easily moving the position on the water channel by mounting the sound wave Doppler tachometer to the position adjusting means. A data acquisition unit for easily acquiring the measured data connected to the installed sonic Doppler flowmeter, and the volume of the extraction volume and the distance to the bottom of the channel using the acquired data connected to the data acquisition unit are stored. Include microcomputers for The position adjusting means includes a mounting portion for stably fixing the sonic Doppler tachometer, and a transverse direction (y) to adjust the position by operating the sonic Doppler tachometer fixed to the mounting portion to move to a point to be measured to acquire data. A control part consisting of a transverse direction adjusting step for adjusting in the axial direction and a vertical direction adjusting step for adjusting in the vertical direction (z-axis), and at the lower end of the position adjusting means so as to easily move along the rail installed at the upper part of the channel. Device for measuring the rate of change of scour depth and riverbed according to time, characterized in that it consists of a plurality of wheels installed, and a guide portion pointing to the numerical value indicated on the tape measure attached to the side of the channel so as to show the distance in the longitudinal direction. . Positioning means equipped with an acoustic wave Doppler flowmeter for measuring the flow rate is installed on the upper part of the waterway to measure the scour depth or bed change rate while accurately moving to the measurement point in the longitudinal and transverse directions, and the rainfall using the scour depth change rate measured above (B) A method of measuring the rate of change of scour depths and riverbeds over time, characterized in that it is carried out to predict possible scour depths that may occur in the field in consideration of the effects of time variation on flood events. The method of claim 6, Stably fixing the sound wave Doppler flowmeter to a mounting portion of the position adjusting means; Moving the position adjusting means to which the sound wave Doppler flowmeter is fixed to a position to measure data by using an adjusting unit; Operating a sonic Doppler rheometer reaching the position to be measured to measure the distance between the extraction volume and the bottom of the channel; Measuring the distance between the extracted volume and the bottom of the channel by accurately moving to the initially recorded position coordinates by using the position adjusting means again at a time required for measurement or at regular time intervals after the measurement is made; Obtaining an accurate scour depth or time change rate of the bed phase by using an interpolation method of the distance between the extracted volume and the bed phase recorded at the predetermined time intervals; Method of measuring the rate of change of scour depth and bed height with time, characterized in that for executing. The method of claim 7, wherein The scour depth and bed height according to time, characterized in that during the experiment to measure by using the acoustic wave Doppler flowmeter is carried out to move the position adjusting means to the place where the influence due to the acoustic wave Doppler flowmeter is hardly affected by the flow change. How to measure time change rate. The method of claim 7, wherein In the process of measuring the distance to the extraction volume and the bottom of the channel by operating the acoustic wave Doppler flowmeter, Acquire data measured by the data acquisition unit connected to the sonic Doppler flowmeter, and record and store the distance to the extraction volume and the bottom of the channel through the microcomputer connected to the data acquisition unit, and accurately measure the time change rate of scour depth or bed phase. Method for measuring the rate of change of scour depth and bed height with time, characterized in that the execution to obtain. The method of claim 7, wherein In the process of moving the position control means fixed to the sound wave Doppler flowmeter to the position to measure the data by using the control unit, Adjust so that it can be positioned by moving in the lateral direction (y-axis) by the transverse direction adjusting end, and adjusted to be positioned by moving in the vertical direction (z-axis) by the vertical direction adjusting end, Method of measuring the rate of change of scour depth and bed height according to time, characterized in that to be carried out so as to be located in the longitudinal direction by using the wheel installed. Positioning means equipped with an acoustic wave Doppler flowmeter for measuring the flow rate is installed on the upper part of the waterway to measure the scour depth or bed change rate while accurately moving to the measurement point in the longitudinal and transverse directions, and the rainfall using the scour depth change rate measured above (B) stably fixing the acoustic wave Doppler tachometer to the mounting portion of the position adjusting means, in order to predict the scour depth in the field in consideration of the influence of time variation due to flooding; and adjusting the position adjusting means fixed with the acoustic wave Doppler tachometer Using data to move the data to the position to be measured, operating the sonic Doppler flowmeter reaching the position to be measured, measuring the distance to the extraction volume and the bottom of the channel, and after the measurement is made again. Use position control means at regular time intervals The distance between the extracted volume and the bottom of the channel is measured by accurately moving to the initially recorded position coordinates, and the distance between the extracted volume and the bed phase recorded at a predetermined time interval using the interpolation method is used for accurate scrubbing or bed bottoming. To find the rate of change of time, While the experiment is performed using the sonic Doppler tachometer, the position adjusting means is moved to a place where the influence due to the sonic Doppler tachometer hardly changes the flow, and the data acquisition unit connected to the sonic Doppler tachometer is performed. After acquiring the measured data through the microcomputer connected to the data acquisition unit, and recording and storing the distance to the extraction volume and the bottom of the channel, it is executed to accurately calculate the time change rate of scour depth or riverbed, The sound wave Doppler flowmeter is adjusted to be positioned by moving in the lateral direction (y-axis) by the lateral adjustment stage in order to move the fixed position adjusting means to the position to measure the data by using the control unit, the vertical direction adjusting stage By moving in the vertical direction (z-axis) by adjusting so as to be positioned, by using the wheel installed in the lower end of the position adjusting means to move in the longitudinal direction characterized in that the scrubbing and lowering over time How to measure the rate of change in appeal.

Images