CN111236138A - Multi-boundary combined water injection system and method for moving bed river work model - Google Patents
Multi-boundary combined water injection system and method for moving bed river work model Download PDFInfo
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Abstract
The invention discloses a multi-boundary combined water injection system and a method for a moving bed river work model, which comprises the following steps: the movable moving bed region reverse slope water supply device comprises a small-flow water supply flow path and a large-flow water supply flow path. In the embodiment of the invention, a movable water supply device is adopted in a low-lying area of the movable bed in advance, a low-flow water supply flow path is used for water supplement before the flow velocity measuring device starts to work normally, and then the low-flow water supply flow path is matched with the flow velocity measuring device, a high-flow water supply flow path supplies water in the middle section and rises water in a reverse slope at the flow rate smaller than the starting flow velocity of bottom sand, and a water body in the low-lying area is an effective defense for resisting the impact of peripheral water bodies on bed sand. After the water surface submerges the boundary of the moving bed, water is rapidly supplied together with the upstream and downstream boundary water supply devices through the large-flow water supply flow path, and damage of water boundary water supply to the initial terrain is greatly reduced.
Description
Technical Field
The invention is applied to the field of river work model tests, mainly relates to stable water injection of a movable bed bottom sand river reach, and particularly relates to a multi-boundary combined water injection system and method for a movable bed river work model.
Background
The method of moving bed river work model test is often adopted in the laboratory for researching the water flow scouring problem, the moving bed area is the river bed appearance form that non-hardened bed sand is laid according to the river bed appearance, and the scouring evolution characteristics of the river bed are reflected through the interaction with the hydrodynamic force.
According to different test areas and research purposes, the river model test generally divides open water boundaries into a single boundary and multiple boundaries, and external water supply equipment such as water pumps and the like are arranged behind the water boundaries no matter the boundaries. Before the test is operated, after the precise sand paving and various preparation works of the riverbed are completed, the riverway is in a dry state, a water body needs to be injected into the model, and the strict initial water depth condition is met.
In order to avoid unnecessary damage of water flow to movable bed sand-laying terrain during water injection, a water pump low-power slow-speed water supply method is usually adopted at present, the method easily causes movable bed terrain erosion due to the fact that the distance between an operator and a site is long, particularly for a basin-like model with a high terrain at a water boundary, a low terrain at a middle movable bed area and a large fall, the water boundary slow-speed water supply method has the major defect, although the water boundary can provide small flow, a thin water layer still can be automatically accelerated along a slope under the action of gravity due to the fact that a water flow positive slope exists in the model, certain damage is caused to the initial sand-laying terrain, test precision is influenced, if a basin bottom is also located in the movable bed area, a damage block is larger, much time is needed to repair and restore the damage block in water, and test efficiency and precision are influenced.
Disclosure of Invention
The invention aims to provide a multi-boundary combined water injection system and a multi-boundary combined water injection method for a moving bed river work model, and aims to solve the problem that the existing water boundary independent water supply method and the moving bed terrain are easy to damage.
In a first aspect, an embodiment of the present invention provides a multi-boundary joint waterflooding system for a moving bed river model, including:
an upstream boundary water supply device for supplying water to the upstream,
A downstream boundary water supply device for supplying water to the downstream, and
the movable moving bed region reverse slope water supply device is used for supplying water to the moving bed region and comprises a small-flow water supply flow path and a large-flow water supply flow path.
Further, the upstream boundary water supply device comprises an upstream frequency converter, an upstream submersible pump electrically connected with the upstream frequency converter and an upstream self-recording water level meter used for collecting upstream water level measurement values.
Further, the downstream boundary water supply device comprises a downstream frequency converter, a downstream submersible pump electrically connected with the downstream frequency converter and a downstream self-recording water level meter used for collecting downstream water level measured values.
Furthermore, the upstream submersible pump and the downstream submersible pump are both arranged in a circulating water pool.
Further, a water outlet of the upstream submersible pump is communicated into the upstream forebay.
Further, a water outlet of the downstream submersible pump is communicated into the downstream forebay.
Further, the movable moving bed region adverse slope water supply device comprises a clean water tank, a first vacuum pump, a second vacuum pump, a first frequency converter, a second frequency converter, a flow velocity measuring device and a steady flow facility, wherein the flow velocity measuring device is used for detecting the flow velocity on the sand surface of the moving bed, the first vacuum pump is electrically connected with the first frequency converter, the second vacuum pump is electrically connected with the second frequency converter, the first vacuum pump and the second vacuum pump both take water from the clean water tank, and the steady flow facility is arranged at the low-lying position of the sand surface of the moving bed and receives the water pumped out by the first vacuum pump and the second vacuum pump.
Further, the flow velocity measuring device comprises a flow velocity meter and a propeller flow velocity measuring rod electrically connected with the flow velocity meter, and the propeller flow velocity measuring rod is fixed on a movable bed sand surface needing to measure the flow velocity.
Further, the steady flow facility adopts a rubber cushion, and the surface of the rubber cushion is provided with non-smooth wave-shaped stripes.
In a second aspect, an embodiment of the present invention further provides a multi-boundary joint waterflooding method for a moving bed river model, including:
laying a steady flow facility at a low-lying position of the sand surface of the moving bed;
starting a first vacuum pump, setting a preset frequency for a first frequency converter, driving the first vacuum pump to supply water, enabling the bottom water level to rise until the flow velocity measuring device can normally operate, and closing the first vacuum pump;
starting a second vacuum pump, increasing the frequency of a second frequency converter of the second vacuum pump when the flow velocity V is synchronously measured by a flow velocity measuring device, wherein V is less than V0, and stopping increasing when V is more than V0, so that bottom sand in a moving bed area is not started, and water is continuously injected into a pit of the moving bed; wherein V0 is the flow rate for bottom sand flush initiation;
when the downstream self-recording water level meter detects a first determination water level Z1When the flow is increased, the downstream submersible pump is controlled to be started, and the flow is slowly increased;
detecting second determination water level Z by upstream self-recording water level meter2In time, the upstream submersible pump is controlled to start and slowly increase the flow until the target water level Z is reachedtAnd stabilizing the water surface;
and after the water surface is stable, the second vacuum pump is closed.
According to the embodiment of the invention, mainly combining the conditions that the area ratio of a low-lying deep water area to a model is not large, the water demand is small and slow water supply is realized, the embodiment of the invention adopts a movable water supply device in the low-lying area of a movable bed in advance, the movable water supply device in the movable bed area in an adverse slope manner comprises a small-flow water supply flow path and a large-flow water supply flow path, the small-flow water supply flow path supplies water in a middle section and the adverse slope rises water at a flow rate smaller than the starting flow rate of bottom sand, and the water body in the low-lying area is an effective defense for resisting the impact of peripheral water bodies on bed sand. After the water surface submerges the moving bed boundary, water is rapidly supplied through the large-flow water supply flow path and the upstream and downstream boundary water supply devices, the water injection speed can also be ensured, the terrain and the appearance of the key moving bed area are stable and are not corroded, and the damage of the water boundary water supply to the initial terrain is greatly reduced. The quality of the sand surface of the moving bed and the test precision are improved by jointly injecting water.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the basic arrangement of a river model;
FIG. 2 is a schematic view of the structure along the elevation of a body line A;
FIG. 3 is a diagram showing the basic preparation work before the test;
in the figure, a downstream forebay 11, an upstream forebay 12, a water return channel 13, a water outlet hole 14, a fixed bed river bed 2, a moving bed sand surface 21, a moving bed area sand-laying layer 22, a ground 23, a control terminal 3, a downstream frequency converter 41, an upstream frequency converter 42, a first frequency converter 43, a second frequency converter 44, a circulating water tank 51, a clear water tank 52, a downstream submersible pump 61, an upstream submersible pump 62, a first vacuum pump 63, a second vacuum pump 64, a water outlet pipe 71, a water inlet pipe 72, a current meter 8, a downstream self-recording water level meter 91, an upstream self-recording water level meter 92, a propeller current measuring rod 93, a steady flow facility 10, a deep water line A, a target water level ZtFirst water level Z1And the second water level Z2Downstream full pond water level M1Upstream full pond water level M2。
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.
Fig. 1 is a schematic diagram of the basic arrangement of a river model, which is a part of a river channel, wherein the side wall and the bottom surface of the main body of the model are both made of red bricks and concrete, and the model is an enclosed body and is watertight. The water flow movement is simulated by the two water boundaries of the upstream boundary and the downstream boundary of the model together, the moving bed area of the important research is positioned in the middle of the model, and the whole model is marked with a deep body line A along the length direction of the river course in the drawing. The boundary water supply facility comprises a water pool, a diving pump group, a front pool and other auxiliary facilities. The submersible pump group pumps water from the water pool, firstly enters the forebay, and can enter the river channel model after water flow is uniformly mixed through an energy dissipation facility (not marked in the figure), wherein the upstream and downstream water pools are communicated through a water return channel, and in addition, each boundary forebay is provided with a water inlet submersible pump and a water outlet hole matched with a valve (not marked in the figure), so that the simulation of water flow movement and water body stability are facilitated.
Fig. 2 is a schematic structural diagram of a multi-boundary combined water injection system for a moving bed river model according to an embodiment of the present invention, in which the model can be seen to be constructed in a vertical plane along a direction of a deep body line a, wherein a river channel is composed of a fixed bed river bed 2, a moving bed sand surface 21 and a sand-laying layer 22. A fixed bed riverbed 2 in the riverway is a hardened cement surface, water flow cannot erode and wash, a movable bed area is positioned in the middle of the riverway, a sand laying layer 22 is model sand selected according to a similar principle of bed sand starting, the surface form of the model sand which is finely manufactured according to actual test requirements is a movable bed sand surface 21, and the sand laying layer can be flushed under the condition of conventional test water flow.
With reference to fig. 2, an embodiment of the present invention provides a multi-boundary joint waterflooding system for a moving bed river model, including:
an upstream boundary water supply device for supplying water to the upstream,
A downstream boundary water supply device for supplying water to the downstream, and
the movable moving bed region reverse slope water supply device is used for supplying water to the moving bed region and comprises a small-flow water supply flow path and a large-flow water supply flow path.
According to the embodiment of the invention, the low-lying deep water area of the movable bed in the embodiment of the invention usually occupies a small area ratio of the model, the water demand is small, and the condition of realizing slow water supply is met. After the water surface submerges the moving bed boundary, water is rapidly supplied through the large-flow water supply flow path and the upstream and downstream boundary water supply devices, the water injection speed can also be ensured, the terrain and the appearance of the key moving bed area are stable and are not corroded, and the damage of the water boundary water supply to the initial terrain is greatly reduced. The quality of the sand surface of the moving bed and the test precision are improved by jointly injecting water.
According to an embodiment of the present invention, the upstream boundary water supply includes an upstream frequency converter 42, an upstream submersible pump 62 electrically connected to the upstream frequency converter 42, and an upstream self-recording water level gauge 92 for collecting upstream water level measurements. The downstream boundary water supply device comprises a downstream frequency converter 41, a downstream submersible pump 61 electrically connected with the downstream frequency converter 41 and a downstream self-recording water level gauge 91 for acquiring a downstream water level measured value. The upstream and downstream self-recording water level meters are arranged on the cement surfaces outside the upper and lower boundaries of the movable bed and need to be vertically arranged, except for the measuring pins, the main structure parts have the waterproof requirement, and the installation height needs to be higher than the highest water level in the model by more than 10 cm.
Furthermore, the upstream submersible pump 62 and the downstream submersible pump 61 are both arranged in a circulating water pool 51, wherein the circulating water pool 51 is positioned below the ground, the capacity of the water pool needs to consider the total water consumption in the model and the draft requirement of the submersible pumps, and the upstream circulating water pool and the downstream circulating water pool need to be communicated through a water return channel.
Further, a water outlet of the upstream submersible pump 62 is communicated with the upstream forebay 12, a water outlet of the downstream submersible pump 61 is communicated with the downstream forebay, and water flows can enter the river model after being uniformly mixed through an energy dissipation facility (not shown).
For upstream boundary water supply, the water level measurement value of the upstream self-recording water level meter 92 is automatically compared with the trigger reference value, and the start of the upstream frequency converter 42 is determined. The upstream submersible pump 62 is arranged at the bottom of the circulating water pool 51 and connected with the upstream frequency converter 42, and after the water pump is started, water flow enters the front pool through the water outlet pipe 71 to be fully mixed and then flows into the model. The water supply of the downstream boundary is basically the same as that of the upstream boundary, the water level measurement value of the downstream self-recording water level meter 91 is automatically compared with the trigger reference value, the downstream frequency converter 41 is determined to be started, and the upstream circulating water tank and the downstream circulating water tank need to be communicated through a water return channel.
According to the embodiment of the invention, the movable moving bed region reverse slope water supply device comprises a clean water tank 52, a first vacuum pump 63, a second vacuum pump 64, a first frequency converter 43, a second frequency converter 44, a flow rate measuring device and a steady flow facility 10, wherein the first vacuum pump 63 and the second vacuum pump 64 both take water from the clean water tank 52, the steady flow facility 10 is arranged at a low-lying position of the moving bed sand surface 21 and receives the water pumped by the first vacuum pump 63 and the second vacuum pump 64, and the flow rate measuring device is arranged on the moving bed sand surface beside the steady flow facility 10 and is used for detecting the flow rate on the moving bed sand surface.
Furthermore, the first vacuum pump 63 and the second vacuum pump 64 both have corresponding frequency converter control flow, the first path is the first vacuum pump 63, the control of the first frequency converter 43 is used for slow water supply before the propeller flow rate measuring rod 93 can normally work, and the rated flow is 1m3H is used as the reference value. The other path is a second vacuum pump 64, which supplies water with a slightly larger flow rate under the control of the frequency converter of the second frequency converter 44 under the condition of ensuring that the bottom sand is basically not started, and needs to adoptRated flow rate of 5-10 m3A pump of/h.
Further, the flow rate measuring device includes a flow meter 8 and a propeller flow rate measuring rod 93 electrically connected to the flow meter 8. The current meter 8 is arranged at the dry position outside the model, a propeller current measuring rod 93 for measurement is vertically arranged in the model, the propeller direction needs to be along the water flow direction, and the lower probe is arranged at the position needing to be measured.
According to the embodiment of the invention, the flow stabilizing facility 10 is made of flexible materials, preferably a rubber cushion, the surface of the rubber cushion is provided with non-smooth wave-shaped stripes (the protruding amplitude is more than 5 mm), the flow speed of water flow is favorably reduced by increasing the roughness, and the flow stabilizing facility 10 is taken out after the model water injection is basically completed.
The downstream frequency converter 41, the upstream frequency converter 42, the first frequency converter 43, the second frequency converter 44, the flow meter 8, the downstream self-recording water level meter 91 and the upstream self-recording water level meter 92 can be controlled by a control terminal 3, and the control terminal 3 is an industrial control machine. The frequency converter plays a role in changing the water output of each pump. The self-recording water level meter is fixed in the model by adopting a mechanical steel frame, so that a measuring needle of the water level meter always tracks the water surface and is used for detecting the water level elevation value. The 8 ports of the current meter are connected with a propeller current measuring rod 93, the propeller current measuring rod 93 is arranged in the model to obtain a single-point current signal, and the single-point current signal is transmitted into the control terminal 3 after data conversion of the current meter.
The embodiment of the invention provides a multi-boundary combined water injection system for a moving bed river model, which is applied to the field of river model tests and mainly aims to realize initial stable water injection comprising a moving bed river reach model and a fixed bed river reach model. The following is an example of a model including two water boundaries, upstream and downstream, which can simulate tidal and flood dynamics to wash the river bed:
the installation and preparation work before the test comprises fixed-point installation of a self-recording water level meter which bears the discrimination function, stable frequency calibration under different characteristic water levels at the boundary, model sand starting flow velocity value and other conventional installation and the like.
As shown in FIG. 3, this example is a model containing two water boundaries, upstream and downstream, in combinationExperimental experience has tried that when the water level rises to the 2m outside of the moving bed, the opposite impact of the boundary water flow basically does not produce bottom erosion on the topography of the moving bed area, and the upper and lower self-recording water level instruments are installed on the deep body cement surface of the moving bed at the 2m outside of the downstream boundary. When the water level is not in a water state, the measuring needle of the water level meter tracks the cement surface, and when the water level slowly rises to the position of the measuring needle, a signal is received in time. Since the topography of the downstream riverbed is generally lower than that of the upstream, the downstream self-recording level meter 91 detects the first determination water level Z1The upstream self-recording water level meter 92 detects a second determination water level Z2. The water level meter requires the measurement precision to be 0.02mm, and the detection time is about 2 seconds.
The relationship calibration of each boundary water level and stable frequency is needed to be completed in advance under the state of no sand laying, and the relationship calibration is used as basic data of each test in the future. The stable frequency is a frequency value of a frequency converter corresponding to a certain water level in a no-flow state in the model and stable for a long time, if the frequency is greater than the value, the water in the model is net inflow, the water level rises, otherwise, if the frequency is less than the stable value, the water is net outflow, and the water level falls. For the downstream boundary, the downstream full water level M at which the front pool just remains stable needs to be calibrated1Frequency f of time correspondence0 is lowerTo reach the target water level ZtTime-corresponding downstream frequency converter frequency value f1 is underAnd manufacturing a file-kz (file-kz) of the downstream automatic control file of the frequency converter1) At the beginning of start-up, from f0 is lowerTo f1 is underLinearly interpolating according to time, stably increasing frequency, and finally, according to maximum value f1 is underThe water injection and the model water surface stabilization are carried out, and the time period of linear increase is generally set within 10-20 minutes mainly according to the actual water demand reaching the target water level. It should be noted that the frequency control of the downstream and the upstream is completely independent, therefore, the frequency converter calibration is also needed for the upstream just like the downstream, and the front pool just keeps stable upstream full pool water level M2Frequency f of time correspondence0 is onFrequency value f of downstream frequency converter corresponding to target water level1 toSimilarly, it is necessary to make file-kz (file-kz) for automatic control of the upstream of the frequency converter2) At the beginning of start-up, from f0 is onTo f1 toLinearly interpolating according to time, and at later stage, according to maximum value f1 toCarrying out water injection andthe water surface of the model is stable, and the initial starting time can be slightly less than that of the downstream. In order to stabilize the frequency of the water pump, an access voltage stabilizer is required to be configured for the model total power.
Model sand paved in the moving bed area is selected according to the conversion requirement of a model scale, the model sand with the scouring starting characteristic similar to that of a natural river channel, and the flow velocity V of bottom sand scouring starting0Is an essential parameter of the moving bed test, and after the flow rate reaches the value, the bottom sand can be continuously scoured and eroded along with the increase of the flow rate. Conventional sand is typically obtained by direct look-up, and new sand is provided by additional starting tests.
The basic control flow of the multi-boundary combined water injection system is as follows:
and S101, laying the steady flow facility 10 at a low-lying position of the movable bed sand surface 21, and connecting a water supply pipeline, the flow meter 8, the propeller flow measuring rod 93 and the like.
Step S102, the movable bed area is used for movable type reverse slope water supply, the first vacuum pump 63 is started firstly, although the flow velocity cannot be measured at the moment, the task of the stage only needs to enable the water level of the depression area to rise by 3-5 cm, the required total water amount is small, only a turbidity meter (not marked in the figure) needs to be inserted into the water, on the basis that the turbidity is basically not increased during field monitoring, in the control terminal 3, a fixed small frequency (10-25 hz frequency) is set for the first frequency converter 43, so that the first vacuum pump is driven to supply water, the water level at the bottom is enabled to rise slowly, until the probe of the flow velocity measuring rod has enough water depth, and the first vacuum pump 63 is turned off until the probe of the flow velocity measuring rod can.
Step S103, starting the second vacuum pump 64 from a low frequency, synchronously measuring the flow velocity V, automatically controlling the frequency of the second frequency converter 44 by the control terminal 3 according to the comparison and judgment of the flow velocity and V0, gradually increasing the frequency of the frequency converter (the frequency change speed is generally within the range of 1hz per minute increase limit when V is less than V0), and stopping increasing the frequency when V is greater than V0, so that the bottom sand in the moving bed area is not started, and water is continuously injected into the pit of the moving bed.
Step S104, the downstream self-recording water level meter 91 detects a first determination water level Z1In time, the control system calls the automatic control file (file-kz)1) And controlling the downstream submersible pump 61 to start and slowly increase the flow.
Step S105, the upstream self-recording water level meter 92 detects a second determination water level Z2In time, the control system calls the automatic control file (file-kz)2) Controlling the upstream submersible pump 62 to start and slowly increase the flow until the target water level Z is reachedtAnd the water surface is stabilized for a certain time.
And S106, in the water surface stabilization period, the second vacuum pump 64 is closed, the flow stabilizing facility 10 and the propeller flow rate measuring rod 93 are removed, and after the water surface is stabilized, multi-boundary combined water injection is completed, so that an important foundation is laid for the next step of simulating the rising and falling tide movement.
In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A multi-boundary joint waterflooding system for a moving bed river model, comprising:
an upstream boundary water supply device for supplying water to the upstream,
A downstream boundary water supply device for supplying water to the downstream, and
the movable moving bed region reverse slope water supply device is used for supplying water to the moving bed region and comprises a small-flow water supply flow path and a large-flow water supply flow path.
2. The multi-boundary joint water injection system for the moving bed river work model according to claim 1, wherein the upstream boundary water supply device comprises an upstream frequency converter, an upstream submersible pump electrically connected with the upstream frequency converter and an upstream self-recording water level meter for collecting upstream water level measurement values.
3. The multi-boundary joint water injection system for the moving bed river work model according to claim 2, wherein the downstream boundary water supply device comprises a downstream frequency converter, a downstream submersible pump electrically connected with the downstream frequency converter and a downstream self-recording water level meter for collecting downstream water level measurement values.
4. The multi-boundary combined water injection system for the moving bed river work model according to claim 3, wherein the upstream submersible pump and the downstream submersible pump are both arranged in one circulating water pool.
5. The multi-boundary combined water injection system for the moving bed river model according to claim 2, wherein a water outlet of the upstream submersible pump opens into the upstream forebay.
6. The multi-boundary combined water injection system for the moving bed river model according to claim 3, wherein a water outlet of the downstream submersible pump opens into the downstream forebay.
7. The multi-boundary joint water injection system for the moving bed river work model as claimed in claim 1, wherein the movable moving bed region reverse slope water supply device comprises a clean water tank, a first vacuum pump, a second vacuum pump, a first frequency converter, a second frequency converter, a flow rate measuring device for detecting the flow rate on the moving bed sand surface and a flow stabilizing facility, the first vacuum pump is electrically connected with the first frequency converter, the second vacuum pump is electrically connected with the second frequency converter, the first vacuum pump and the second vacuum pump both take water from the clean water tank, and the flow stabilizing facility is arranged at a low position of the moving bed sand surface and receives the water pumped by the first vacuum pump and the second vacuum pump.
8. The multi-boundary combined water injection system for the moving bed river work model according to claim 7, wherein the flow velocity measuring device comprises a flow velocity meter and a propeller flow velocity measuring rod electrically connected with the flow velocity meter, and the propeller flow velocity measuring rod is fixed on a moving bed sand surface needing to measure the flow velocity.
9. The multi-boundary combined water injection system for the moving bed river work model as claimed in claim 1, wherein the steady flow facilities are rubber cushions, and the surface of the rubber cushions is provided with unsmooth wave-shaped stripes.
10. A multi-boundary joint water injection method for a moving bed river work model is characterized by comprising the following steps:
laying a steady flow facility at a low-lying position of the sand surface of the moving bed;
starting a first vacuum pump, setting a preset frequency for a first frequency converter, driving the first vacuum pump to supply water, enabling the bottom water level to rise until the flow velocity measuring device can normally operate, and closing the first vacuum pump;
starting a second vacuum pump, increasing the frequency of a second frequency converter of the second vacuum pump when the flow velocity V is synchronously measured by a flow velocity measuring device, wherein V is less than V0, and stopping increasing when V is more than V0, so that bottom sand in a moving bed area is not started, and water is continuously injected into a pit of the moving bed; wherein V0 is the flow rate for bottom sand flush initiation;
when the downstream self-recording water level meter detects a first determination water level Z1When the flow is increased, the downstream submersible pump is controlled to be started, and the flow is slowly increased;
detecting second determination water level Z by upstream self-recording water level meter2While controlling the upstream latencyThe water pump is started and the flow is slowly increased until the target water level Z is reachedtAnd stabilizing the water surface;
and after the water surface is stable, the second vacuum pump is closed.
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