CN104032704A - Simulation system and water flow resistance calculating method and device of river channel with floating plants - Google Patents
Simulation system and water flow resistance calculating method and device of river channel with floating plants Download PDFInfo
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Abstract
The invention discloses a simulation system and a water flow resistance calculating method and device of a river channel with floating plants. The water flow resistance calculating method of the river channel with the floating plants includes the steps of building a circulating variable slope water tank system for simulating the river channel, building a floating plant fixing system for simulating the floating plants in the circulating variable slope water tank system, adjusting the circulating variable slope water tank system and the floating plant fixing system so that physical parameters can meet design requirements, measuring a water tank bottom slope and flow speed statistical variables in the circulating variable slope water tank system, and calculating water flow resistance of the floating plants according to the measured water tank bottom slope and the flow speed statistical variables and by means of a preset calculation model, wherein physical parameters include water flow, the water level and the lengths of plants immersed in water.
Description
Technical field
The present invention relates to Environmental Water dynamics technology field, be specifically related to resistance to water-flow computational methods and the device of a kind of simulation system containing fluitante river course and a kind of simulation system containing fluitante river course.
Background technology
Plant is common in natural river course, lake overbank and manmade landscape, artificial landscape's channel.Plant provides home for aquatile, has also increased flood passage resistance simultaneously, has changed the rule of turbulent fluctuation structure and sediment movement, affects that Pollutants Diffusion is defeated moves, and is the vital factor of influence of river hydrodynamic system.Modern river management is more and more paid attention to the Ecology pattern of " water security, water environment, water landscape, aqueous culture, water economy " five in one, therefore the effect of water plant is more and more paid attention in the planning and designing in river course, and various plants are planted in the major trough in the river course of being everlasting or overbank.
Mainly to determine river cross-section size and base slope according to the flood passage amount in river course to the planning and designing in river course at present, and in the time considering flood passage resistance and landscape effect, there is no the special design manual for containing plant river course, general dependence carried out the correction of roughness to the qualitative judgement of plant density degree.This is mainly because natural plants is of a great variety, different, is difficult to determine containing the streamflow resistance of plant.By the relative position relation of plant and river water level, plant can be divided into non-submersion plant, submerged plant and fluitante, if Fig. 1-1 is to as shown in Fig. 1-3.
At present, mainly stress in submerged plant and non-submersion plant operating mode for the research containing plant river course, also rare to the river course research under fluitante condition.And one of fluitante floristics that to be river course common, as Chinese scholartree leaf duckweed, duckweed, Eichhornia crassipes and water hyacinth etc.
Adopt the above-mentioned planning and designing method to plant river course, do not consider the impact of fluitante on river course turbulent property, there will be the problem of following aspect:
(1) flow velocity statistical variable (as flow velocity, eddy stress) prediction has deviation, thereby affects starting and the silt discharge of silt, easily causes Sediment Siltation, reduces the conveyance capacity in river course;
(2) the flood passage resistance gauge in river course is not calculated accurately really, crosses highland and estimates flood discharge capacity, has increased the risk of river course flood, easily causes occurring flood;
(3) analysis of turbulent fluctuation structure produces deviation, thereby mistake is estimated current to the defeated ability of moving of the diffusion of pollutant, increases the risk of the pollution of river.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of simulation system containing fluitante river course and contains resistance to water-flow computational methods and the device of the simulation system in fluitante river course, utilize kinetic theory knowledge, realize scientifically and rationally the calculating of fluitante resistance to water-flow, for the planning and designing containing fluitante river course provide technical support.
According to one aspect of the present invention, a kind of simulation system containing fluitante river course is provided, comprise for the circulation variable slope tank system of simulating riverway with for simulating the fluitante fixed system of fluitante;
The variable slope of described circulation tank system comprises reservoir, pumping conduit, measuring water flow meter, variable frequency pump, tail-gate, sluicing pond, backwater gallery, tank, wherein, one end access reservoir of pumping conduit, the other end of pumping conduit is connected with one end of measuring water flow meter, the other end of measuring water flow meter is connected with one end of variable frequency pump, the other end access tank of variable frequency pump, tank communicates with sluicing pond by tail-gate, and sluicing pond communicates with reservoir by backwater gallery;
Described simulation fluitante fixed system comprises fluitante, rivet, threaded connector, plastic plate and first fixed bearing of simulation, wherein, rivet inserts the plastic plate with intensive boring, the fluitante of simulation and the colligation of rivet end are connected to form simulation fluitante band, plastic plate center is provided with threaded connector, and plastic plate is threaded connection part and is connected with the first fixed bearing.
According to another aspect of the present invention, a kind of resistance to water-flow computational methods of the simulation system containing fluitante river course are provided, comprising:
Set up the variable slope of the circulation tank system for simulating riverway, and set up the fluitante fixed system for simulating fluitante in the tank system of the variable slope of described circulation;
Regulate described circulation variable slope tank system and fluitante fixed system, its physical index is met design requirement, the plant length that described physical index comprises discharge, water level and submerges in water;
Measure tank base slope and flow velocity statistical variable in the tank system of the variable slope of described circulation;
According to the tank base slope of described measurement and flow velocity statistical variable, by default computation model, calculate fluitante resistance to water-flow.
According to another aspect of the present invention, a kind of resistance to water-flow calculation element of the simulation system containing fluitante river course is provided, comprising:
System made module, sets up the variable slope of the circulation tank system for simulating riverway, and sets up the fluitante fixed system for simulating fluitante in the tank system of the variable slope of described circulation;
Parameter arranges module, regulates described circulation variable slope tank system and fluitante fixed system, and its physical index is met design requirement, the plant length that described physical index comprises discharge, water level and submerges in water;
Measurement module, measures tank base slope and flow velocity statistical variable in the tank system of the variable slope of described circulation;
Computing module, according to the tank base slope of described measurement and flow velocity statistical variable, by default computation model, calculates fluitante resistance to water-flow.
A kind of simulation system containing fluitante river course provided by the invention and containing resistance to water-flow computational methods and the device of the simulation system in fluitante river course, by setting up the variable slope of simulation loop tank system, and in Simulated Water tank systems, set up and simulate fluitante fixed system, the data such as discharge, tank water level, tank base slope and flow velocity statistical variable in measure analog tank system, finally the data that measure are calculated, obtained fluitante resistance to water-flow in Simulated Water tank systems.The present invention, by setting up simulation loop variable slope tank system and simulation fluitante fixed system, utilizes hydraulic theory knowledge, has realized scientifically and rationally the calculating of fluitante resistance to water-flow, for the planning and designing in fluitante river course provide technical support.
Brief description of the drawings
Fig. 1-1 is non-submersion plant schematic diagram;
Fig. 1-2 is submerged plant schematic diagram;
Fig. 1-3 are fluitante schematic diagram;
Fig. 2-1 is a kind of simulation system lateral view containing fluitante river course of the embodiment of the present invention one;
Fig. 2-2 are a kind of simulation system top view containing fluitante river course of the embodiment of the present invention one;
Simulate fluitante fixed system lateral view a kind of the containing in the simulation system in fluitante river course that Fig. 3-1 is the invention process one;
Simulate fluitante fixed system top view a kind of the containing in the simulation system in fluitante river course that Fig. 3-2 are the embodiment of the present invention one;
Fig. 4 is the resistance to water-flow computational methods flow chart of a kind of simulation system containing fluitante river course of the embodiment of the present invention two;
Fig. 5 is the stressed schematic diagram in river course in a kind of resistance to water-flow computational methods of the simulation system containing fluitante river course of the embodiment of the present invention two;
Fig. 6 is that a kind of simulation of the embodiment of the present invention three is containing the resistance to water-flow calculation element schematic diagram of the simulation system in fluitante river course;
In figure, the 1st, reservoir, the 2nd, pumping conduit, the 3rd, measuring water flow meter, the 4th, variable frequency pump, the 5th, par grid, the 6th, rule, the 7th, upstream is supported, the 8th, liftable screw rod, the 9th, tail-gate, the 10th, sluicing pond, the 11st, backwater gallery, the 12nd, tank, the 13rd, plastic plate, the 14th, rivet, the 15th, threaded connector, the 16th, the fluitante of simulation, 17 is first fixed bearings, and 18 is second fixed bearings, the 19th, and acoustic Doppler velocimetry (ADV).
Detailed description of the invention
Below in conjunction with accompanying drawing, principle of the present invention and feature are described, example, only for explaining the present invention, is not intended to limit scope of the present invention.
Embodiment mono-, a kind of simulation system containing fluitante river course.Be elaborated below in conjunction with Fig. 2-1 to Fig. 3-2 pair system provided by the invention.
A kind of simulation system containing fluitante river course provided by the invention comprises the fluitante fixed system for the variable slope of the circulation tank system in river course, simcity and floating class plant that can simulating riverway.
As shown in Fig. 2-1 and Fig. 2-2, the variable slope of simulation loop tank system comprises reservoir 1, pumping conduit 2, measuring water flow meter 3, variable frequency pump 4, par grid 5, rule 6, upstream supports 7, downstream supports 8, tail-gate 9, sluicing pond 10, backwater gallery 11, tank 12, the fixed bearing 18 of acoustic Doppler velocimetry 19 and connection acoustic Doppler velocimetry, wherein, one end access reservoir 1 of pumping conduit 2, the other end of pumping conduit 2 is connected with one end of measuring water flow meter 3, the other end of measuring water flow meter 3 is connected with one end of variable frequency pump 4, the other end access tank 12 of variable frequency pump 4, tank 12 communicates with sluicing pond 10 by tail-gate 9, sluicing pond 10 communicates with reservoir 1 by backwater gallery 11, par grid 5 is housed in tank, bottom of gullet is laid marble slab, the long 12m of tank, wide 0.42m, high 0.70m, on tank, downstream is provided with fixing nonadjustable upstream and supports 7, adjustable downstream supports 8, upstream supports 7 apart from upstream water inlet 2m, and downstream supports 8 apart from downstream delivery port 3.5m, and the sidewall of tank is provided with rule 6, be provided with acoustic Doppler velocimetry 19 near tail-gate 9, acoustic Doppler velocimetry 19 is arranged on the second fixed bearing 18.
Downstream is supported 8 and is provided with gear and liftable screw rod, and in order to regulate tank base slope, it is-5%～3% that tank becomes slope scope; When work, current suction tank 12 after variable frequency pump 4 work, enters backwater gallery 11 through tail-gate 9 afterwards, then returns to reservoir 1 and realizes circulation.
As shown in Fig. 2-1, Fig. 3-1 and Fig. 3-2, simulation fluitante fixed system comprises fluitante 16, rivet 14, threaded connector 15, plastic plate 13 and first fixed bearing 17 of simulation, wherein, rivet 14 inserts the plastic plate 13 with intensive boring, fluitante 16 and the rivet 14 end colligations of simulation are connected to form simulation fluitante band, plastic plate 13 centers are provided with threaded connector 15, and plastic plate 13 is threaded connection part 15 and is connected with the first fixed bearing 17.
Implant simulation tank for making the fluitante of simulation, it is carrier that selection has the plastic plate 13 of intensive boring, determine and need to settle the position of plant on plastic plate 13 according to designing requirement, then plug rivet 14 in the relevant position of plastic plate 13, then the fixing fluitante band that forms of end colligation with rivet 14 by the fluitante of simulation 16, the center of plastic plate 13 is provided with threaded connector 15, its effect is that this threaded connector 15 and the first fixed bearing 17 of its top are joined together, and realizes the implantation of fluitante in tank.
The resistance to water-flow computational methods of embodiment bis-, a kind of simulation system containing fluitante river course.Below in conjunction with Fig. 4 and Fig. 5, method provided by the invention is elaborated.
In Fig. 2, S401, foundation are used for the variable slope of the circulation tank system of simulating riverway, and in the tank system of the variable slope of this circulation, set up the fluitante fixed system for simulating fluitante.
Concrete, the simulation loop variable slope tank system that the present embodiment is set up and simulation fluitante fixed system can, referring to the description in embodiment mono-, not be repeated.
S402, adjusting circulation variable slope tank system and fluitante fixed system, meet design requirement its physical index, the plant length that this physical index comprises discharge, water level and submerges in water.
Concrete, the variable slope of simulation loop tank system and simulation fluitante fixed system are set up by above-mentioned steps S401, set up after the tank system of the variable slope of simulation loop, according to designing requirement, regulate simulation loop variable slope tank system and simulation fluitante fixed system, its physical index is met design requirement.When concrete enforcement, as Fig. 2-1, first control inlet flow rate and utilize measuring water flow meter 3 measuring flows to make it equal design discharge Q by the circulate variable frequency pump 4 of variable slope tank system of adjusting, again by repeatedly regulating tail-gate 9 and the liftable screw rod 8 of the variable slope of circulation tank system and can arranging that rule measurement water level makes it reach the depth of water h of designing requirement by varible slope flume sidewall in simulation loop, and by regulating the threaded connector in fluitante fixed system, the plant length that makes to submerge in the water h that meets design requirement
v.
It should be noted that, for allowing to measure water flow, the present embodiment choice for use ultrasonic flowmeter carries out the measurement of discharge; According to the needs of design, the present embodiment is arranged rule 6 at the tank sidewall of the variable slope of simulation loop tank system, precision is 1mm, carry out the measurement of tank water level with rule 6, the method of water level of measuring tank with the upstream and downstream designated water level chaining pin at tank is different, adopt the method for the present embodiment can avoid the trouble that repeatedly regulates needle water level gauge to bring, in meeting precision, can save consuming timely, therefore adopt the method for the measurement tank water level of the present embodiment to have certain superiority than the method that adopts needle water level gauge to measure the water level of tank.
S403, measure tank base slope and flow velocity statistical variable in the tank system of the variable slope of described circulation.
Meet by step S402 after the physical index of designing requirement, due to meet the demands in setting physical index time utilized ultrasonic flowmeter 3 and rule 6 discharge and the tank water level to tank to measure, now also need measure fundamental physical quantity have tank base slope and flow velocity statistical variable (time average velocity, eddy stress etc.).
In the present embodiment, tank base slope is by regulating near the liftable screw rod 8 of downstream delivery port, the precision that tank base slope is measured is directly connected to the accuracy that fluitante resistance to water-flow is calculated, and therefore the present embodiment is determined tank base slope by level gauge.When concrete enforcement, first tank is carried out to calibration, utilize level gauge that tank is set as to flat slope, then record respectively the difference in height △ h of flat slope and design conditions lower flume downstream end, and the distance of fixed support and tank downstream end is L on tank, tank base slope is i=△ h/L.
Flow velocity statistical variable comprises time average velocity and eddy stress etc., and what in the present embodiment, need measurement is eddy stress.The measurement of eddy stress realizes by acoustic Doppler velocimetry 19.When specific implementation, as shown in Figure 2, acoustic Doppler velocimetry (ADV) 19 is placed in to the fluitante band downstream end of simulation, be arranged on the second fixed bearing 18 so that by fixing acoustic Doppler velocimetry 19, specific implementation to the measuring process of tank flow velocity statistical variable (eddy stress) in, be mainly divided into raw data acquisition and data filtering and process two parts.Before starting data acquisition, need to be for the hydraulics of design, some relevant parameters to acoustic Doppler velocimetry (ADV) arrange, such as sample frequency, sampling height, transmitted pulse length, energy intensity and sampling time etc., after the parameter setting of acoustic Doppler velocimetry (ADV) is completed, start to utilize acoustic Doppler velocimetry (ADV) to carry out the data acquisition of the flow velocity statistical variable (eddy stress) of tank.After image data completes, by WinAdv software, the data that gather are carried out to filtration treatment, be mainly that the signal to noise ratio of data and the control of two parameters of correlation of collection are carried out to filtration treatment, thereby obtain this hydraulic parameters of eddy stress that the present embodiment needs.Wherein, utilize the data acquisition of the flow velocity statistical variable (eddy stress) of acoustic Doppler velocimetry (ADV) to tank and the filtration treatment of the data that gather is all realized by prior art, not being repeated.
S404, according to measure tank base slope and flow velocity statistical variable, by default computation model, calculate fluitante resistance to water-flow.
Concrete, after measuring above-mentioned physical quantity data by above-mentioned steps S403, through the analytical calculation to these data, just can obtain containing fluitante resistance to water-flow in fluitante river course.In the process of concrete Treatment Analysis data, because the resistance that plant produces is also inhomogeneous along vertical direction, be therefore necessary the vertical distribution situation of the resistance of studying plant generation.As shown in Figure 5, Fig. 5 is the stressed schematic diagram of current containing fluitante river course, for convenience of research, to control volume in scheming as the water body of 1*1*1 is as research object, known by the force analysis along water (flow) direction:
Fd=Fg+F τ (1) wherein, Fg is that local water body deadweight is along the active constituent flowing to, F τ makes a concerted effort with the shear action of the neighbouring water body of local water body, and Fd is the resistance that fluitante produces local water body, in the present embodiment Fd is called to fluitante resistance to water-flow.
Easily know by hydraulic theory knowledge:
Fg＝(1*1*1)ρgi (2)
Wherein, the eddy stress that τ (z) is unit area,
for the eddy stress gradient of the unit area at vertical certain z place, position.
In conjunction with three of above-mentioned (1)-(3) design formulas, can obtain the resistance that fluitante produces local water body and be:
For unit of water body volume, fluitante resistance to water-flow can be expressed as:
Wherein, Fd refers to be positioned at the fluitante resistance to water-flow at z place, vertical position, ρ refers to the density of water, g refers to acceleration of gravity, i refers to tank base slope, τ (z) refers to eddy stress, distributes according to measuring gained tank base slope and eddy stress, can calculate fluitante resistance to water-flow distribute in conjunction with formula (5).
A kind of resistance to water-flow computational methods containing fluitante river course that above-described embodiment two proposes the present invention are described in detail, for the further deep method of understanding the present invention's proposition, below in conjunction with a concrete example, whole method of the present invention is described.
Be 10.1L/s according to designing requirement by regulating variable frequency pump to make containing the discharge of fluitante tank, by repeatedly regulating tail-gate and liftable screw rod to make to reach design head 12cm, the long 12m of tank, wide 0.42m.In addition, the fluitante of simulation is chosen rigid cylindrical rod (can certainly select other material), and the length that rigid cylindrical rod enters in water is h
v=6cm, diameter d
v=0.6cm, on plastic plate, plant is arranged the fore-and-aft distance Sx=5cm of adjacent two strain plants, lateral separation Sy=2cm with rectangular mode.Utilize level gauge to record the difference in height △ h=3.68cm of flat slope and design conditions lower flume downstream end, the distance of tank upstream fixed support and tank downstream end is L=1000cm.Be τ (z) through acoustic Doppler flow meter (ADV) image data the eddy stress that obtained after filtration treatment by WinAdv software.
, from above-mentioned formula 6, the fluitante resistance to water-flow Fd that is positioned at z place, vertical position is:
The resistance to water-flow calculation element of embodiment tri-, a kind of simulation system containing fluitante river course.Below in conjunction with Fig. 6, device provided by the invention is described in detail.
In Fig. 6, a kind of resistance to water-flow calculation element containing fluitante river course provided by the invention comprises that system made module 601, parameter arrange module 602, measurement module 603 and computing module 604.
System made module 601 is mainly used in setting up the variable slope of the circulation tank system for simulating riverway, and sets up the fluitante fixed system for simulating fluitante in the tank system of the variable slope of this circulation.
Concrete, system made module 601 is set up the method that is used for the circulation variable slope tank system of simulating riverway and sets up the fluitante fixed system for simulating fluitante and can, referring to the detailed description of embodiment mono-, be repeated.
Parameter arranges module 602 and is mainly used in regulating system and sets up simulation loop variable slope tank system and the simulation fluitante fixed system that module 601 sets up, its physical index is met design requirement, the plant length that this physical index comprises discharge, water level and submerges in water.
Concrete, parameter arranges module 602 and comprises that the first parameter arranges module, for the variable frequency pump control inlet flow rate of the variable slope tank system that circulates by adjusting, and utilizes ultrasonic flowmeter measuring flow that discharge is met design requirement.
Parameter arranges module 602 and also comprises that the second parameter arranges module, for passing through repeatedly to regulate tail-gate and the liftable screw rod of the variable slope of circulation tank system, and can arrange that rule measurement water level meets design requirement water level value by varible slope flume sidewall in circulation.
Parameter arranges module 602 and also comprises that the 3rd parameter arranges module, and for passing through to regulate the threaded connector of described fluitante fixed system, the plant length that makes to submerge in water meets design requirement.
Measurement module 603 is mainly used in measuring tank base slope and the flow velocity statistical variable in the tank system of the variable slope of circulation.
Wherein, measurement module 603 comprises the first measurement submodule, for measuring tank base slope by level gauge measuring method.
Measurement module 603 also comprises the second measurement submodule, for adopting acoustic Doppler velocimetry to measure flow velocity statistical variable.
Computing module 604 is mainly used in tank base slope and the flow velocity statistical variable measured according to measurement module 603, by default computation model, calculates fluitante resistance to water-flow.
Concrete, computing module 604, by default computation model, calculates fluitante resistance to water-flow, and wherein, computation model is as follows:
Wherein, Fd refers to be positioned at the fluitante resistance to water-flow at z place, vertical position, and ρ refers to the density of water, and g refers to acceleration of gravity, and i refers to tank base slope, and τ (z) refers to eddy stress.
A kind of simulation system containing fluitante river course provided by the invention, the variable slope of the circulation for river course, the simcity tank system of foundation, can simulate the river course containing fluitante under different hydraulics; Simulate fluitante fixed system by foundation, can simulate natural in esse different fluitantes, and can realize the simulation of different arrangement modes and the plant different densities of plant.By simulation loop variable slope tank system and the simulation fluitante fixed system set up, can realize the river course simulation that multiple different designs requires, concrete flexibility fully.
In addition, a kind of resistance to water-flow computational methods and device containing fluitante river course provided by the invention, by setting up the variable slope of simulation loop tank system and simulating fluitante fixed system and simulate the river course containing fluitante, then measure the fundamental physical quantity of required measurement, as discharge, tank water level, tank base slope and current statistical variable (eddy stress), finally these data analysis that measure are calculated, obtain containing the resistance of fluitante to current in fluitante river course, thereby utilize the method for simulation containing fluitante river course, realize scientifically and rationally the calculating of fluitante resistance to water-flow, fill up the blank containing the vegetation water flow resistance in fluitante river course, for the planning and designing containing fluitante river course provide technical support.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. containing the simulation system in fluitante river course, it is characterized in that, comprise for the circulation variable slope tank system of simulating riverway with for simulating the fluitante fixed system of fluitante;
The variable slope of described circulation tank system comprises reservoir, pumping conduit, measuring water flow meter, variable frequency pump, tail-gate, sluicing pond, backwater gallery and tank, wherein, one end access reservoir of pumping conduit, the other end of pumping conduit is connected with one end of measuring water flow meter, the other end of measuring water flow meter is connected with one end of variable frequency pump, the other end access tank of variable frequency pump, tank communicates with sluicing pond by tail-gate, and sluicing pond communicates with reservoir by backwater gallery;
Described simulation fluitante fixed system comprises fluitante, rivet, threaded connector, plastic plate and first fixed bearing of simulation, wherein, rivet inserts the plastic plate with intensive boring, the fluitante of simulation and the colligation of rivet end are connected to form simulation fluitante band, plastic plate center is provided with threaded connector, and plastic plate is threaded connection part and is connected with the first fixed bearing.
2. the simulation system containing fluitante river course as claimed in claim 1, it is characterized in that, the variable slope of described circulation tank system also comprises and is arranged on the rule of tank sidewall and near the acoustic Doppler velocimetry of tail-gate, described acoustic Doppler velocimetry is arranged on the second fixed bearing.
3. resistance to water-flow computational methods for the simulation system containing fluitante river course as claimed in claim 1 or 2, is characterized in that, comprising:
Set up the variable slope of the circulation tank system for simulating riverway, and set up the fluitante fixed system for simulating fluitante in the tank system of the variable slope of described circulation;
Regulate described circulation variable slope tank system and fluitante fixed system, its physical index is met design requirement, the plant length that described physical index comprises discharge, water level and submerges in water;
Measure tank base slope and flow velocity statistical variable in the tank system of the variable slope of described circulation;
According to the tank base slope of described measurement and flow velocity statistical variable, by default computation model, calculate fluitante resistance to water-flow.
4. resistance to water-flow computational methods as claimed in claim 3, is characterized in that, regulate described circulation variable slope tank system and fluitante fixed system, its physical index is met design requirement and comprise:
By regulating the variable frequency pump control inlet flow rate of the variable slope of described circulation tank system, and utilize ultrasonic flowmeter measuring flow, flow value is met design requirement;
By repeatedly regulating tail-gate and the liftable screw rod of the variable slope of described circulation tank system, and can arrange rule measurement water level by varible slope flume sidewall in described circulation, water level value is met design requirement;
By regulating the height of the threaded connector regulating plant in described fluitante fixed system, the plant length that makes to submerge in water meets design requirement.
5. resistance to water-flow computational methods as claimed in claim 3, is characterized in that, tank base slope and the flow velocity statistical variable measured in the tank system of the variable slope of described circulation comprise:
Measure tank base slope by level gauge measuring method;
Adopt acoustic Doppler velocimetry to measure flow velocity statistical variable.
6. resistance to water-flow computational methods as claimed in claim 3, is characterized in that, according to the tank base slope of described measurement and flow velocity statistical variable, by default computation model, calculate fluitante resistance to water-flow, and wherein, described default computation model is as follows:
Wherein, Fd refers to be positioned at the fluitante resistance to water-flow at z place, vertical position, and ρ refers to the density of water, and g refers to acceleration of gravity, and i refers to tank base slope, and τ (z) refers to eddy stress.
7. a resistance to water-flow calculation element for the simulation system containing fluitante river course as claimed in claim 1 or 2, is characterized in that, comprising:
System made module, sets up the variable slope of the circulation tank system for simulating riverway, and sets up the fluitante fixed system for simulating fluitante in the tank system of the variable slope of described circulation;
Parameter arranges module, regulates described circulation variable slope tank system and fluitante fixed system, and its physical index is met design requirement, the plant length that described physical index comprises discharge, water level and submerges in water;
Measurement module, measures tank base slope and flow velocity statistical variable in the tank system of the variable slope of described circulation;
Computing module, according to the tank base slope of described measurement and flow velocity statistical variable, by default computation model, calculates fluitante resistance to water-flow.
8. hydraulic resistance calculation element as claimed in claim 7, is characterized in that, described parameter arranges module, for regulating described circulation variable slope tank system and fluitante fixed system, its physical index is met design requirement and specifically comprise:
The first parameter arranges module, by regulating the variable frequency pump control inlet flow rate of the variable slope of described circulation tank system, and utilizes ultrasonic flowmeter measuring flow, and flow value is met design requirement;
The second parameter arranges module, by repeatedly regulating tail-gate and the liftable screw rod of the variable slope of described circulation tank system, and can arrange rule measurement water level by varible slope flume sidewall in described circulation, and water level value is met design requirement;
The 3rd parameter arranges module, and by regulating the threaded connector in described fluitante fixed system, the plant length that makes to submerge in water meets design requirement.
9. resistance to water-flow calculation element as claimed in claim 7, is characterized in that, described measurement module comprises:
First measures submodule, for measuring tank base slope by level gauge measuring method;
Second measures submodule, for adopting acoustic Doppler velocimetry to measure flow velocity statistical variable.
10. resistance to water-flow calculation element as claimed in claim 7, is characterized in that, described computing module, for by default computation model, calculates fluitante resistance to water-flow, and wherein, described default computation model is as follows:
Wherein, Fd refers to be positioned at the fluitante resistance to water-flow at z place, vertical position, and ρ refers to the density of water, and g refers to acceleration of gravity, and i refers to tank base slope, and τ (z) refers to eddy stress.
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| CN108398541A (en) * | 2018-02-26 | 2018-08-14 | 河海大学 | The experimental provision and experimental method of adjustable riverbed plant |
| CN110858257A (en) * | 2018-08-09 | 2020-03-03 | 中国农业大学 | Method and system for predicting hydraulic damping of axial flow pump blade |
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| CN110858257A (en) * | 2018-08-09 | 2020-03-03 | 中国农业大学 | Method and system for predicting hydraulic damping of axial flow pump blade |
| CN110858257B (en) * | 2018-08-09 | 2021-04-27 | 中国农业大学 | Method and system for predicting hydraulic damping of axial flow pump blade |
| CN111122116A (en) * | 2020-01-10 | 2020-05-08 | 河海大学 | Experimental device for simulating coarse sublayer flow velocity distribution and method for determining coarse sublayer flow velocity distribution |
| WO2021139579A1 (en) * | 2020-01-10 | 2021-07-15 | 中国长江三峡集团有限公司 | Method for determining flow velocity distribution of rough sub-layer |
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| CN111274745B (en) * | 2020-01-21 | 2022-09-16 | 河海大学 | Method for determining boundary height of water flow in submerged plant layer |
| CN112113743A (en) * | 2020-09-29 | 2020-12-22 | 华北水利水电大学 | Physical simulation device for water-sand two-phase flow field in vegetation group and simultaneous monitoring method |
| CN115222115A (en) * | 2022-07-07 | 2022-10-21 | 珠江水利委员会珠江水利科学研究院 | Comprehensive roughness calculation method and system for plant-containing river channel |
| CN115222115B (en) * | 2022-07-07 | 2023-06-16 | 珠江水利委员会珠江水利科学研究院 | Comprehensive roughness calculation method and system for plant-containing river channel |
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