CN204982777U - Reciprocal device that flows river course normal position bed mud resuspending of simulation - Google Patents

Abstract

A device for simulating in-situ sediment resuspension in a reciprocating flow channel, in which the upstream flow water level control device includes a first water inlet pipe, an upstream water level control water tank, an upstream reflux simulation water tank, a first siphon return pipe, and a first water outlet pipe; The flume device includes a flume body, a bottom mud tank, a flow rate measuring instrument, a turbidity meter, and at least two sampling ports; the downstream tide simulation control device includes a tidal water level control water tank, a second siphon return pipe, a tidal backflow simulation water tank, a backflow water tank, an overflow Water pipes, variable frequency water pumps, and second water outlet pipes; the automatic control device of the experimental platform includes a first resistive liquid level gauge, a second resistive liquid level gauge, a first cable, a second cable, a first brushless DC motor, The second DC brushless motor, the first movable pull plate, and the second movable pull plate. Simulation process: sediment preparation; overlying water preparation; installation of velocity meter and turbidimeter; unidirectional flow simulation; tidal reciprocating flow simulation; water sample determination. The device has high simulation accuracy and can be popularized.

Description

A device for simulating in-situ sediment resuspension in reciprocating channels

technical field

The utility model belongs to the technical field of water body ecological environment, and relates to a reciprocating flow channel simulation device, in particular to a resuspension device for simulating reciprocating flow channel in-situ sediment resuspension.

Background technique

The estuary is the confluence area between the river and the ocean, and it is also the most valuable ecosystem related to human activities. With the rapid growth of population and rapid economic development in our country, the problems of water quality and eutrophication in estuary areas have become increasingly prominent, and pollutants such as heavy metals and organic matter in river sediments in some estuary areas have exceeded the standard. In recent years, the implementation of water diversion projects, reservoir projects, and river regulation projects has resulted in a decrease in the discharge of rivers, which directly increases the upstream distance of tidal sea water, and also increases the sediment disturbance zone, which seriously affects the water quality of rivers; with the global climate Warming, melting of glaciers, and rising sea levels have caused storm surges to intensify and increase in frequency, causing the sediment to release more pollutants to the overlying water bodies, causing serious secondary pollution to the water quality of estuaries. According to foreign studies, dissolved organic matter and particulate matter are transported to tidal flats during high tide and deposited there; during ebb tide, some deposited particulate matter is resuspended and returned to the river channel, seriously affecting river water quality. The key measure to improve the water quality of the estuary is to control the material exchange and energy transmission between the water body and the surface sediment in the river during tidal action.

The indoor simulation methods in the prior art are almost mainly to simulate the sediment resuspension of lakes and unidirectional flow rivers, while there are few studies on the resuspension of river sediments by reciprocating flow. Existing simulation devices mainly include beaker type, Erlenmeyer flask type, sink type and so on. Among them, the beaker type and conical flask type not only have limited volume, but also are in a closed boundary, without inflow and outflow conditions; the sink type uses propeller propellers, wave generators, etc. to cause disturbance of the water body above the sediment, thereby generating sediment resuspension, However, it is generally one-way flow, and the hydrodynamic conditions of reciprocating flow cannot be realized. These methods cannot effectively reflect the actual situation of the influence of the flow field on the sediment resuspension under the hydrodynamic conditions of the reciprocating flow channel for the dynamic disturbance, left and right vibration, up and down extrusion or unidirectional horizontal movement of the water body generated by the overlying water. None of the current indoor simulation methods can realize the simulation of in-situ sediment resuspension in a reciprocating flow channel based on precise control of water level.

Chinese patent application 201410175672.6 proposes a "circulating straight water tank device that simulates sediment resuspension under the action of reciprocating flow". The technical solution is mainly composed of frequency conversion water pumps, solenoid valves and straight water tanks. Although it has the advantages of using frequency conversion pump and solenoid valve control to change the flow velocity, water depth and flow direction of the water flow, and using the control cabinet to directly control the frequency of the water pump and the condition of the solenoid valve opening to adjust the water flow. However, there are still the following deficiencies. First, the flow field generated by the pumping station and the solenoid valve can not truly simulate the actual flow field of the river tide (especially in the estuary area), and the complex flow field cannot be well simulated due to the different state of the flow field. Second, the flume adopts vertical grooves. In the test, the flow field changes after the sediment at the edge of the groove is washed, which destroys the layered result of the sediment and affects the simulation results of sediment resuspension.

Utility model content

Aiming at the deficiencies of the prior art, the purpose of this utility model is to provide a device for simulating in-situ sediment resuspension in a reciprocating flow channel, which can simulate the hydrodynamic conditions of tidal reciprocating flow in the estuary under the conditions of different discharge flows in the upstream and different intensities of tidal water levels in the downstream , and can simulate the hydrodynamic conditions of the reciprocating flow channel in the plain area, and simulate the in-situ sediment resuspension device.

A device for simulating in-situ sediment resuspension in a reciprocating flow channel, comprising an upstream flow water level control device, a water tank device, a downstream tide simulation control device, and an automatic control device for an experimental platform. The upstream flow water level control device includes a first water inlet pipe, an upstream water level Control water tank, upstream reflux simulation water tank, first siphon return pipe, first water outlet pipe, one end of the first water inlet pipe is set in the upstream reflux simulation water tank, one end of the first siphon return pipe is set in the upstream reflux simulation water tank, and the other end is set in the upstream reflux simulation water tank In the upstream water level control water tank, the first water inlet pipe is provided with a first water inlet pipe valve, and the first siphon return pipe is provided with a first siphon return pipe valve; the water tank device includes a water tank body, a bottom mud tank, a flow rate Measuring instrument, turbidity meter, at least 2 sampling ports, the bottom mud tank is a groove with a slope, located at the middle bottom of the tank body, and the flow rate measuring instrument and turbidity meter are fixed above the bottom mud tank On the water tank, the sampling port is located on the water tank body, one of which is close to the upstream water level control water tank at 0.5-1.5m; the downstream tide simulation control device includes a tide water level control water tank, a second siphon return pipe, a tidal backflow simulation water tank, a backflow water tank, The overflow pipe, the frequency conversion water pump, the second water outlet pipe, and the tidal water level control water tank communicate with the upstream water level control water tank through the tank body. Inside, the second siphon return pipe is provided with a second siphon return pipe valve; The second water outlet pipe is located below the tidal water level control water tank and communicates with the return water tank. The return water tank communicates with the upstream water level control water tank through the first water outlet pipe. The return water pipes are respectively connected to the upstream return flow simulation water tank and the tidal return flow simulation water tank. The first return flow pipe is provided with a first return pipe valve, and the second return flow pipe is provided with a second return pipe valve; the automatic control device of the experimental platform includes The first resistive liquid level gauge, the second resistive liquid level gauge, and the first DC brushless motor connected by the first cable and the second cable, the second DC brushless motor and the first movable pull plate, The second movable pull plate, the first brushless DC motor is connected to the first movable pull plate through the first cable, the first movable pull plate is located in the upstream water level control water tank, and the second brushless DC motor passes through The second cable is connected to the second movable pull plate, and the second movable pull plate is located in the tide water level control water tank, and the first resistance type liquid level gauge and the second resistance type liquid level gauge are respectively separated from the upstream water level control water tank and the tide water level gauge. The water level control water tank is fixed at the bottom of the water tank at 15-25 cm. A pair of first guard plates are provided on both sides of the first movable drawer, and a pair of second guard plates are provided on the second movable drawer.

Preferably, the bottom mud tank is symmetrically located in the middle of the tank body.

Preferably, there are four sampling ports, two of which are located 0.5-1.5m away from the upstream water level control water tank and the tidal water level control water tank, and the other two are located above the bottom mud tank.

Preferably, the bottom mud tank is a groove with a slope, and the inclination of the slope is at least 20°.

Preferably as the slope, the slope of the slope is 10 centimeters high and 40 centimeters long.

Preferably, the top of the tank body is hollowed out.

The simulation process of the device for simulating in-situ sediment resuspension in a reciprocating flow channel includes the following steps: Step 1, sediment preparation: collecting undisturbed sediment, and then placing the collected undisturbed sediment in a sediment tank for standby;

Step 2, preparation of overlying water: use the siphon method to add clear water with a depth of more than 20cm to the tank body, and let it stand for 10-14h;

Step 3, assembly of flow rate meter and turbidity meter: place the flow rate measuring device above the bottom mud tank in the tank body, 5cm-10cm away from the top of the bottom mud, and connect with the lifting platform above the tank body, place the turbidity meter on the flow rate measurement Next to the instrument, it is connected with the lifting platform;

Step 4, unidirectional flow simulation method: first calibrate the first resistive liquid level gauge and the second resistive liquid level gauge; convert the measured upstream and downstream water levels into the experimental water level through the vertical scale, and input it into the computer; turn on the first When the water level in the upstream reflux simulated water tank rises to the height of the first siphon return pipe, the valve of the water inlet pipe opens the valve of the first siphon return pipe, and water flows into the upstream water level control water tank along the first siphon return pipe, so that the water level of the upstream water level control water tank reaches The height of the second guard plate, close the first water inlet valve and the first siphon return pipe valve at this time, and open the first water inlet valve, the first siphon return pipe valve, the frequency conversion water pump and the first siphon return pipe valve after the water level calms down , and start to run the water flow operation program of the tank body, so that the water flows to the direction of the tidal water level control water tank, and the computer sends a signal to adjust the first movable pull plate and the second movable pull plate to control the water level of the upstream water level control water tank and the tidal water level control water tank ;

Step 5, tidal reciprocating flow simulation method: close the valve of the first return water pipe, open the valve of the second return water pipe, and use the frequency conversion water pump (29) to pump the water in the return water tank through the second return water pipe to the tidal return simulation water tank (34) , and at the same time open the valve of the second water inlet pipe on the second water inlet pipe (35) to flow into the tidal return simulation water tank until the water level of the tidal return simulation water tank (34) exceeds the second siphon return pipe, at this time, turn down the valve of the second water inlet pipe and the variable frequency water pump (29), and then open the valve of the second siphon return pipe, the water in the tidal return simulation water tank enters the tidal water level control water tank through the second siphon return pipe (38), so that the water level of the tidal water level control water tank rises, and the second The DC brushless motor adjusts the height of the second movable pull plate according to the water level in the tidal water level control water tank, so that the water level in the tidal water level control water tank rises, and the water in the tank body flows back upwards. When the high tide limit time is simulated, the second siphon is closed. The valve of the return pipe, the valve of the second water inlet pipe and the valve of the second return pipe, the siphon is destroyed, and the water flow stops. After simulating the high tide limit, open the valve of the first return pipe, and pump the water in the return tank through the first return pipe. The upstream backflow simulates the water tank, in which the water in the tidal water level control water tank is adjusted by the second movable pull plate, and then flows into the backflow water tank from the second outlet pipe until the water level of the tidal water level control water tank drops to the most normal water level line of the tide. At this time, it is a high tide Stop, so that the first return pipe valve, the second return pipe valve, the second inlet pipe valve, the second siphon return pipe valve and the frequency conversion pump are adjusted in this way to simulate high tide and low tide for many times;

Step 6, water sample measurement: through the sampling port, take water samples during the one-way flow period, the tide simulation high tide period, and the tidal ebb period, and collect water samples from the upper, middle and lower layers of the sampling port above the sediment, and record the turbidity data from the meter and flowmeter.

The principle of the utility model device: according to the theory of geometric similarity, the size of the actual river channel is used to compare the size of the water tank body, and an abnormal model can be used for some river channels; The bodies meet at a certain moment to form a flow field, and the formed flow field conforms to the complex flow field characteristics of the reciprocating flow channel. The utility model device and usage method designed thereby can fully simulate the resuspension process of the reciprocating flow channel sediment.

Beneficial effect

1. The utility model can simulate the characteristics of the change of the confluence flow field under different flow conditions in the upstream and downstream, and can simulate the changing law of the resuspension of the river sediment by the reciprocating flow.

2. The combination of the siphon return pipe and the outlet pipe can simulate the rising tide and ebb tide of the tide more realistically, and control the tide amplitude by controlling the valve opening of the siphon return pipe and the height of the movable pull plate.

3. The bottom mud tank in the middle of the water tank is designed as a groove with a slope, which can effectively avoid the change of the flow field of the water flow at the edge of the groove (due to the continuous erosion of the bottom mud by the water flow, forming a hollow state), which will affect the effect of the bottom mud resuspension.

4. The bottom mud tank in the middle of the water tank can effectively receive the bottom mud samples collected by a kind of soft cloth back cover type shallow water surface sediment sampler proposed in Chinese patent application 201310184563.6. The structure is not destroyed, and the original characteristics of the bottom mud are maintained.

5. The automatic control device of the experimental platform can automatically adjust the water level in the tank, and can accurately simulate the actual water level; it can realize continuous simulation of rising and falling tides (it is more convenient in simulating semi-diurnal tide areas), and avoid the flow field when the tide rises and falls. Does not match the actual flow field.

Description of drawings

Fig. 1 is a schematic plan view of the device of the present utility model, wherein, 1, the first water inlet pipe, 2, the first water inlet pipe valve, 3, the upstream reflux simulation water tank, 4, the first siphon return pipe valve, 5, the first siphon Return pipe, 6. Upstream water level control water tank, 7. The first brushless DC motor, 8. The first cable, 11. The first water outlet pipe, 12. The tank body, 13. The first resistive liquid level gauge, 14 , turbidity meter, 15, flow rate measuring instrument, 16, bottom mud, 17, bottom mud tank, 18, second resistance liquid level gauge, 19, sampling port, 20, tidal water level control water tank, 21, second direct current without Brush motor, 22, the second cable, 25, the second outlet pipe, 26, the return water tank, 27, the overflow pipe valve, 28, the overflow pipe, 29, the frequency conversion water pump, 30, the first return water pipe valve, 31, The first return water pipe, 32 the second return water pipe valve, 33, the second return water pipe, 34, the tidal return simulation water tank, 35, the second water inlet pipe, 36, the second water inlet pipe valve, 37, the second siphon return pipe valve, 38. The second siphon return pipe;

Fig. 2 is the overall structure cross-sectional schematic diagram of the device of the present utility model, 9, the first guard plate, 10, the first movable pull plate, 23, the second guard plate, 24. the second movable pull plate;

Fig. 3 is the sectional view of the downstream device of the present utility model;

Fig. 4 is a schematic diagram of the automatic control device of the experimental platform of the present invention.

detailed description

The following examples can enable those skilled in the art to understand the utility model more comprehensively, but do not limit the utility model in any way.

1 and 2, the utility model provides a device for simulating in-situ sediment resuspension in a reciprocating flow channel, including an upstream flow level control device, a water tank device, a downstream tide simulation control device, and an automatic control device for an experimental platform.

Wherein the upstream flow water level control device comprises the first water inlet pipe 1, the upstream backflow simulation water tank 3, the upstream water level control water tank 6, the first backflow water pipe 31, the first siphon backflow pipe 5 and the first water outlet pipe 11, the first water inlet pipe One end of 1 is set in the upstream backflow simulation water tank 3, one end of the first siphon backflow pipe 5 is set in the upstream backflow simulation water tank 3, and the other end is set in the upstream water level control water tank 6, and the first water inlet pipe 1 is provided with a first inlet Water pipe valve 2, the first siphon return pipe 5 is provided with a first siphon return pipe valve 4; the water tank device includes a water tank body 12, a turbidity meter 14, a flow rate measuring instrument 15, a bottom mud tank 17, and two sampling ports 19 , the bottom mud tank 17 is a groove with a slope, located at the bottom of the tank body 12, the flow rate measuring instrument 15 and the turbidity meter 14 are arranged above the bottom mud tank 17 and fixed on the tank body 12, the The sampling port 19 is located on the tank body 12, one of which is 0.5-1.5m away from the upstream water level control tank; the downstream tide water level control device includes a tide water level control tank 20, a second outlet pipe 25, a return water tank 26, an overflow pipe 28, a frequency conversion Water pump 29, tidal backflow simulation water tank 34, second siphon backflow pipe 38, said tidal water level control water tank 20 communicates with upstream water level control water tank 6 through tank body 12, and one end of said second siphon backflow pipe 38 is arranged on tidal backflow simulation water tank 34, the other end is located in the tidal water level control water tank 20, the second siphon return pipe 38 is provided with a second siphon return pipe valve 37, and one end of the second water inlet pipe 35 is located in the tidal return simulation water tank 34, The second water inlet pipe 35 is provided with a second water inlet pipe valve 36, and the second water outlet pipe 35 is located below the tide water level control water tank 20 to communicate with the return water tank 26, and the return flow water tank 26 communicates with the upstream through the first water outlet pipe 11 The water level control water tank 6 is connected, and the other side is connected with the variable pressure water pump 29, and the pressure variable water pump 29 is respectively connected with the upstream backflow simulation water tank 3 and the tidal backflow simulation water tank 34 through the first return water pipe 31 and the second backflow water pipe 33. The water pipe 31 is provided with a first return pipe valve 30, and the second return pipe 33 is provided with a second return pipe valve 32; the laboratory platform automatic control device includes a first DC brushless motor 7, a second DC brushless Brush motor 21, first movable pull plate 10, second movable pull plate 24, first resistive liquid level gauge 13, second resistive liquid level gauge 18, first dragline 8 and second dragline 22, described The first DC brushless motor 7 is connected to the first movable pull plate 10 through the first pull cable 8, and the first movable pull plate 10 is located in the upstream water level control water tank, and the second DC brushless motor 21 is connected through the second pull The cable 22 is connected to the second movable pull plate 24, the second movable pull plate 24 is located in the tidal water level control tank 20, and the first resistive liquid level gauge 13 and the second resistive liquid level gauge 18 are respectively separated from the upstream water level control The water tank 6 and the tidal water level control water tank 2015-25cm are fixed on the bottom of the water tank, and are fixed on the bottom of the water tank. A pair of first guard plates 9 are arranged on both sides of the first movable pull plate 10, so The second movable pull plate 24 is provided with a pair of second guard plates 23 .

The first water inlet pipe 1 is provided with a first water inlet pipe valve 2 to provide sufficient flow for the upstream backflow simulation water tank 3; the upstream backflow simulation water tank 3 makes the water level in the upstream water level control water tank 6 periodically change or occur through the first siphon backflow pipe 5 Small changes, then measure the water level depth of the tank by the first resistance type liquid level gauge 13, and adjust the height of the first movable pull plate 10 through the first brushless DC motor 7, so that the upstream water level is in line with the actual situation; the upstream water level controls the water tank 6 is connected with the tank body 13; the edge of the bottom mud tank 17 designed on the tank body 12 is connected with the tank body 12 by an inclined sloping plate; the tank body 12 is connected with the downstream tide water level control tank 20, and the tide water level control tank 20 is used by the second activity The pull plate 24 is divided into two parts (water inlet area and water outlet area); when the tide falls, water flows into the water outlet area from the top of the second movable pull plate 24, enters the return water tank 26 through the second water outlet pipe 25, and opens the overflow tank 26 when the water level exceeds a certain height. Flow pipe valve 27, water is drained from the overflow pipe 28; the water in the backflow water tank 26 is returned to the tidal backflow simulation water tank 34 or the upstream backflow simulation water tank 3 through the frequency conversion water pump 29 during high tide, to reduce the waste of water; the tidal backflow simulation water tank 34 It is connected with the second siphon return pipe 38, through which the valve 37 of the second siphon return pipe controls the size of the tidal flow, and is combined with the second movable pull plate 24 to realize precise control of the water level in the tank.

Water level control: the upstream and downstream water levels are mainly controlled by the first brushless DC motor 7 , the second brushless DC motor 21 , the first movable puller 10 , and the second movable puller 24 . Wherein the first brushless DC motor 7 and the second brushless DC motor 21 adopt a worm gear reduction DC motor, the power of the reduction motor is about 200 watts, and the positive and negative rotation of the motor is controlled by a computer; Large and tall thin nylon rope; the first movable pull plate 10 and the second movable pull plate 24 are controlled by plexiglass with a thickness of 8 cm, and slightly sealed at the seams; the first movable pull plate 10 and the second movable pull plate 24 are controlled The first guard plate 9 and the second guard plate 23 on both sides are used as the minimum water level line, and the above-mentioned guard plate of movable pull plate and guard plate all adopts 2cm plexiglass plate.

Automatic control of the experimental platform: By processing the real-time water level feedback signal captured by the resistive liquid level gauge, the computer compares the captured feedback signal with the ideal value, and determines whether the motor needs to rotate according to the comparison, and if so, decides the time of forward rotation or reverse rotation . The control software judges and controls by itself according to the difference, and automatically optimizes the next step of control according to the result, gradually approaching the true value.

The water tank body 12 is rectangular and is made of 5cm thick plexiglass or engineering plastics; the upper mouth of the water tank body 12 is hollowed out, and the connection adopts flange connection; its size is determined according to the simulated river channel scale; the first water inlet pipe 1, the second The material of a siphon backflow pipe 5, the first water outlet pipe 11, the second water outlet pipe 25, the overflow pipe 28, the first backflow pipe 31, the second backflow pipe 33, the second water inlet pipe 35 and the second siphon backflow pipe 38 is Plastic or rubber; frequency conversion motor 29 selects the 5IK120GU-C type motor of A.Q.L brand for use; flow velocity measuring instrument 15 is a MicroADV acoustic Doppler flow meter; turbidity meter 14 is an optical backscattering turbidimeter of OBS-3A type.

The simulation process of the in-situ sediment resuspension device for simulating the tidal reciprocating flow of the estuary includes the following steps:

Step 1, sediment preparation: use the soft cloth back cover type shallow water area undisturbed surface sediment sampler proposed in Chinese patent application 201310184563.6 to collect undisturbed sediment 16 with a thickness of 20 cm, and then place the collected undisturbed sediment 16 in the sediment Standby in slot 17;

Step 2, preparation of overlying water: use the siphon method to add clear water with a depth greater than 20cm to the tank body 12, and let it stand for 12 hours;

Step 3, assembly of the flow velocity measuring device and the turbidimeter device: place the flow velocity measuring instrument 15 above the bottom mud tank 17 in the tank body 12, 10 cm away from the top of the bottom mud 16, and connect with the lifting platform above the tank body 12, place the The turbidimeter 14 is placed next to the flow rate measuring instrument 15 and is connected with the lifting platform;

Step 4, unidirectional flow simulation method: first calibrate the first resistive liquid level gauge 13 and the second resistive liquid level gauge 18; convert the measured upstream and downstream water levels into experimental water levels through the vertical scale, and input them into the computer; turn on When the first water inlet pipe valve 2 allows the water level in the upstream backflow simulation water tank 3 to rise to the first siphon backflow pipe 5, the first siphon backflow pipe valve 4 is opened and water flows into the upstream water level control water tank 6 along the first siphon backflow pipe 5, so that The water level of the upstream water level control water tank 6 reaches the height of the second guard plate 23, and at this moment, the first water inlet pipe valve 2 and the first siphon return pipe valve 4 are closed. After the water level is calm (i.e. standing still for 10-20 minutes), open the first water inlet valve 2, the first siphon return pipe valve 4, the frequency conversion water pump 29 and the valve 30, and start running the water flow operation program in the tank body 12 to make the water flow to The tidal water level controls the direction flow of the water tank, and the computer sends signals at certain time intervals to adjust the water level of the first movable pull plate 10 and the second movable pull plate 24 to control the upstream water level control water tank 6 and the tidal water level control water tank 20;

Step 5, tidal reciprocating flow simulation method: close the first return water pipe valve 30 and the second return water pipe valve 32, use the frequency conversion water pump 29 to pump the water in the return flow water tank 26 into the tidal return flow simulation water tank 34 through the pipeline 33, and open the second return flow water tank 34 at the same time. The second water inlet pipe valve 36 on the second water inlet pipe 35 flows into the tidal backflow simulation water tank 34 until the water level of the tidal backflow simulation water tank 34 exceeds the second siphon backflow pipe 38 . Now, turn down the second inlet pipe valve 36 and the second return pipe valve 32 and the frequency conversion water pump 29, then open the second siphon return pipe valve 37, and the water in the tidal return simulation water tank 34 enters the tidal water level through the second siphon return pipe 38 Control the water tank 20 so that the water level of the tidal water level control water tank 20 rises, and the second DC brushless motor 21 adjusts the height of the second movable pull plate 24 according to the water level in the tidal water level control water tank 20, so that the water level in the tidal water level control water tank 20 is short. The time rises to make the water in the tank body 12 flow back upwards. When simulating the high tide daily limit time, close the second siphon return pipe valve 37, the second water inlet pipe valve 36 and the second return water pipe valve 32, the siphon is destroyed, and the water flow stops. After simulating the high tide limit, open the first return water pipe valve 30, and pump the water in the return water tank 26 into the upstream return simulation water tank 3 after passing through 31, wherein the water in the tide water level control tank 20 is regulated by the second movable pull plate 24, and then flows from the outlet The second water outlet pipe 25 of the water pipe flows into the backflow water tank 26 until the water level of the tidal water level control water tank 20 thereby descends the most normal water level line of the tide. In this way, the first return water pipe valve 30, the second return water pipe valve 32, the second water inlet pipe valve 36, the second siphon return pipe valve 37 and the frequency conversion water pump 29 are cyclically adjusted to simulate high tides and ebb tides many times. During the simulation experiment, Can increase by adjusting the first water inlet valve 2, the first siphon return pipe valve 4, the first return water pipe valve 30, the second return water pipe valve 32, the second water inlet pipe valve 36 and the second siphon return pipe valve 37 if necessary High flow maintains water depth.

Step 6, water sample measurement: set two sampling ports 19 in the tank body 12, take water samples during the one-way flow period, the tidal simulation high tide period, and the tidal ebb period, and collect the upper, middle and lower layers of the sampling port above the sediment and record the data in the turbidimeter 14 and the flow rate measuring instrument 15.

Example 2

A device for simulating in-situ sediment resuspension in a reciprocating flow channel, comprising an upstream flow level control device, a water tank device, a downstream tide simulation control device, and an automatic control device for an experimental platform, wherein the upstream flow level control device includes a first water inlet pipe 1, Upstream backflow simulation water tank 3, upstream water level control water tank 6, first backflow water pipe 31, first siphon backflow pipe 5 and first water outlet pipe 11, one end of the first water inlet pipe 1 is arranged on upstream backflow simulation water tank 3, first siphon One end of the return pipe 5 is set in the upstream reflux simulation water tank 3, and the other end is set in the upstream water level control water tank 6. The first water inlet pipe 1 is provided with a first water inlet valve 2, and the first siphon return pipe 5 is provided with The first siphon return pipe valve 4 is provided; the water tank device includes a water tank body 12, a turbidity meter 14, a flow rate measuring instrument 15, a bottom mud tank 17, and 4 sampling ports 19, and the bottom mud tank 17 has a slope greater than 20° The groove of the slope is located at the bottom position in the middle of the tank body 12, the flow velocity measuring instrument 15 and the turbidity meter 14 are arranged on the bottom mud tank 17 and fixed on the tank body 12, and the sampling port 19 is located on the tank body 12 , two are close to the upstream water level control water tank 6 and the tidal water level control water tank 200.5-1.5m respectively, and the other two are located above the bottom mud tank 17; the downstream tidal water level control device includes a tidal water level control water tank 20, a second outlet pipe 25, Return water tank 26, overflow pipe 28, frequency conversion water pump 29, tidal return simulation water tank 34, second siphon return pipe 38, said tide water level control water tank 20 communicates with upstream water level control water tank 6 through tank body 12, and said second siphon One end of the return pipe 38 is provided in the tidal return simulation water tank 34, and the other end is arranged in the tidal water level control water tank 20. The second siphon return pipe 38 is provided with a second siphon return pipe valve 37, and the second water inlet pipe 35 One end is arranged in the tidal backflow simulation water tank 34, the second water inlet pipe 35 is provided with a second water inlet pipe valve 36, and the second water outlet pipe 35 is arranged under the tidal water level control water tank 20 to communicate with the backflow water tank 26, and the backflow The water tank 26 communicates with the upstream water level control water tank 6 through the first water outlet pipe 11, and one end is connected with a variable pressure water pump 29, and the variable pressure water pump 29 is respectively connected with the upstream backflow simulation water tank 3 and the tidal backflow through the first return water pipe 31 and the second return water pipe 33 A simulated water tank 34, the first return pipe 31 is provided with a first return pipe valve 30, and the second return pipe 33 is provided with a second return pipe valve 32; the automatic control device of the experimental platform includes a first DC brushless Motor 7, the second DC brushless motor 21, the first movable pull plate 10, the second movable pull plate 24, the first resistive liquid level gauge 13, the second resistive liquid level gauge 18, the first dragline 8 and the second Two pull cables 22, the first brushless DC motor 7 is connected to the first movable pull plate 10 through the first pull cable 8, the first movable pull plate 10 is located in the upstream water level control water tank, and the second DC brushless motor The brush motor 21 is connected to the second movable pull plate 24 through the second cable 22, and the second movable pull plate 24 is located in the tidal water level control water tank 20. A resistive liquid level gauge 13 and a second resistive liquid level gauge 18 are respectively 2015-25 cm away from the upstream water level control water tank 6 and the tidal water level control water tank, fixed at the bottom of the water tank, fixed at the bottom of the water tank, and the first movable pull plate A pair of first guard plates 9 are provided on both sides of 10, and a pair of second guard plates 23 are provided on the second movable pull plate 24.

The simulation process of the in-situ sediment resuspension device for the above-mentioned simulated estuary tidal reciprocating flow channel, steps 1-5 are the same as in Example 1,

Step 6, water sample measurement: set four sampling ports 19 in the tank body 12, take water samples during the one-way flow period, the tidal simulation high tide period, and the tidal ebb period, and collect the upper, middle and lower layers of the sampling port above the sediment and record the data in the turbidimeter 14 and the flow rate measuring instrument 15.

It can be seen from the above embodiments that the in-situ sediment resuspension simulation device of the river channel of the present invention can accurately simulate the in-situ sediment resuspension in the tidal reciprocating river section of the estuary.

The above embodiments of the utility model cannot limit the scope of protection of the utility model, and any equivalent changes or modifications made on the basis of the technical solution still belong to the scope of protection of the technical solution of the utility model.

Claims (6)

1. A device for simulating resuspension of in-situ sediment in a reciprocating flow channel, comprising an upstream flow water level control device, a water tank device, a downstream tide simulation control device, and an automatic control device for an experimental platform, characterized in that: the upstream flow water level control device includes the first A water inlet pipe (1), an upstream water level control water tank (6), an upstream backflow simulation water tank (3), a first siphon return pipe (5), a first water outlet pipe (11), and one end of the first water inlet pipe (1) Set in the upstream backflow simulation water tank (3), one end of the first siphon backflow pipe (5) is set in the upstream backflow simulation water tank (3), and the other end is set in the upstream water level control water tank (6), the first water inlet pipe ( 1) The first water inlet pipe valve (2) is provided on the top, and the first siphon return pipe valve (4) is provided on the first siphon return pipe (5); the water tank device includes a water tank body (12), a bottom mud tank ( 17), flow rate measuring instrument (15), turbidity meter (14), at least 2 sampling ports (19), the bottom mud tank (17) is a groove with a slope, located at the middle bottom of the tank body (12) , the flow rate measuring instrument (15) and the turbidity meter (14) are fixed on the tank above the sediment tank (17), the sampling port (19) is located on the tank body (12), one of which is close to the upstream 0.5-1.5m from the water level control tank (6); the downstream tide simulation control device includes a tide water level control tank (20), a second siphon return pipe (38), a tidal return simulation tank (34), a return tank (26), an overflow The water pipe (28), the frequency conversion water pump (29), the second water outlet pipe (25), and the tidal water level control water tank (20) communicates with the upstream water level control water tank (6) through the tank body (12), and the second siphon return pipe (38) One end is set in the tidal return simulation water tank (34), the other end is set in the tidal water level control water tank (20), and the second siphon return pipe (38) is provided with a second siphon return pipe valve (37) , one end of the second water inlet pipe (35) is set in the tidal return simulation water tank (34), the second water inlet pipe (35) is provided with a second water inlet pipe valve (36), and the second water outlet pipe (25) It is located below the tidal water level control water tank (20) and communicates with the return water tank (26). The return water tank (26) communicates with the upstream water level control water tank (6) through the first outlet pipe (11), and one end is connected with a variable pressure water pump (29 ), the variable pressure water pump (29) is respectively connected to the upstream backflow simulation water tank (3) and the tidal backflow simulation water tank (20) through the first return water pipe (31) and the second return water pipe (33), and the first backflow water pipe (31 ) is provided with a first return pipe valve (4), and the second return pipe (33) is provided with a second return pipe valve (36); the automatic control device of the experimental platform includes a first resistance liquid level gauge (13) , the second resistance type liquid level gauge (18), and the first brushless DC motor (7) and the second brushless DC motor (21) connected by the first cable (8) and the second cable (22) ) and the first movable pull plate (10), the second movable pull plate (24), the first DC The brushless motor (7) is connected to the first movable pull plate (10) through the first cable (8), the first movable pull plate (10) is located in the upstream water level control water tank (6), and the second DC The brush motor (21) is connected to the second movable pull plate (24) through the second cable (22), the second movable pull plate (24) is located in the tidal water level control water tank (34), and the first resistive liquid The level gauge (13) and the second resistive liquid level gauge (18) are respectively 15-25cm away from the upstream water level control tank (6) and the tide water level control tank (20), and are fixed on the bottom of the tank body (12). A pair of first guard plates (9) are provided on both sides of a movable pull plate (10), and a pair of second guard plates (23) are provided on the second movable pull plate (24). 2. The device for simulating in-situ sediment resuspension in a reciprocating channel according to claim 1, characterized in that: the sediment tank (17) is symmetrically located in the middle of the tank body (12). 3. The device for simulating in-situ sediment resuspension in reciprocating river channels according to claim 1, characterized in that there are 4 sampling ports (19), of which 2 are located at a distance from the upstream water level control tank (6) and the tidal water level Control the position of the water tank (20) 0.5-1.5m, and the other two are all located above the bottom mud tank (17). 4 . The device for simulating in-situ sediment resuspension in a reciprocating channel according to claim 1 , characterized in that: the sediment tank ( 17 ) is a groove with a slope, and the inclination of the slope is at least 20°. 5 . The device for simulating in-situ sediment resuspension in a reciprocating channel according to claim 4 , wherein the slope is 10 cm high and 40 cm long. 5 . 6. The device for simulating in-situ sediment resuspension in reciprocating river channels according to claim 1, characterized in that: the top of the tank body (12) is hollowed out.