CN203238590U - Cyclic variable slope water channel system for simulating city watercourse - Google Patents
Cyclic variable slope water channel system for simulating city watercourse Download PDFInfo
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- CN203238590U CN203238590U CN 201320277886 CN201320277886U CN203238590U CN 203238590 U CN203238590 U CN 203238590U CN 201320277886 CN201320277886 CN 201320277886 CN 201320277886 U CN201320277886 U CN 201320277886U CN 203238590 U CN203238590 U CN 203238590U
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Abstract
The utility model provides a cyclic variable slope water channel system for simulating a city watercourse. The cyclic variable slope water channel system for simulating the city watercourse is characterized in that one end of a pumping pipeline is connected to a reservoir, the other end of the pumping pipeline is connected with one end of an ultrasonic flowmeter, the other end of the ultrasonic flowmeter is connected with one end of a variable frequency pump, the other end of the variable frequency pump is connected to a water channel, the water channel is communicated with a drain pond through a tail gate, the drain pond is communicated with the reservoir through a water return gallery, water-leveling gratings are mounted in the water channel, the two sides of the water channel are glass side walls, marble slabs are paved on the bottom of the water channel, an upstream support and a downstream support are respectively arranged on the upstream and the downstream of the water channel, the upstream support is fixed and can not be adjusted, the width between the upstream support and an upstream water inlet is 2m, and the width between the downstream water support and a downstream outlet is 3.5m. The cyclic variable slope water channel system for simulating the city watercourse has the advantages that the variable slope cyclic water channel system can simulate city watercourses under different hydraulic conditions, the resistance of the bottom of a vegetation riverbed under the different hydraulic conditions is obtained, and watercourse planning and design standards are supplied to related cities.
Description
Technical field
The utility model relates to the variable sloping tank system of circulation that is used for the river course, simcity in a kind of definite vegetation riverbed base drag system, belong to the environmental hydraulics technical field.
Background technology
The city is the central area of a regional economy, politics, cultural development, occupies critical role in the human development course.Along with the sustainable development of Chinese society economy, urbanization process is also more and more faster, and the Chinese Urbanization level is near 50% at present.The flow through natural and sloot in city is the important channel of material recycle in the hydrodynamic system, plays an important role in the planning in city, foundation, evolution.And in the urban modernization process of construction, people get along amiably and peacefully in the urgent need to realization and river, the municipal water ecomodel of " water security, water environment, water landscape, aqueous culture, water economy " five in one is more and more advocated, and therefore the planning and designing in modern city river course is also proposed higher requirement.
Vegetation provides the home for aquatile, also increases in addition the flood passage resistance, changes rule of sediment movement, affects defeated the moving of diffusion of pollutant, is vital factor of influence in the urban river dynamical system.For satisfying the municipal water ecomodel requirement of five in one, the effect of aquatic vegetation is more and more paid attention in the planning and designing of modern city river course, and the river course bed surface of being everlasting is planted various vegetation.The city river planning and designing mainly are to determine river cross-section size and base slope according to the flood passage amount, and when considering the flood passage resistance, also not have at present specially in the design manual that contains the vegetation river course, main dependence is carried out the correction of roughness to the qualitative judgement of vegetation density degree.In addition, mainly lay particular emphasis on the resistance that vegetation produces about the research that contains vegetation river course resistance problem both at home and abroad at present, seldom pay close attention to the resistance of bottom, riverbed, even think that it with respect to the vegetation resistance, can be ignored.This is acceptable in the river course of vegetation very dense, but in the most cities river course, the planting density of vegetation often is not very large, and must consider the riverbed base drag this moment.As seen, if the planning and designing of city river do not adopt special vegetation riverbed base drag to determine method, the subject matter of appearance has:
1) the flood passage resistance gauge is not calculated accurately really, and the too high flood discharge capacity of estimating increases city river flood passage risk, easily causes occuring flood;
2) riverbed base drag and sediment movement are closely related, to the inaccurate Sediment Siltation that causes easily of its estimation, reduce the river course conveyance capacity;
3) ignore the riverbed base drag, will cause the vegetation resistance is calculated the generation deviation, thereby the wrong current of estimating increase the city river pollution risk to the defeated ability of moving of the diffusion of pollutant.
Summary of the invention
The utility model proposes a kind of variable sloping tank system of circulation of the river course, simcity for determining vegetation riverbed base drag system, its purpose is intended to overcome the above-mentioned subject matter that has appearance in the existing city river planning and designing.Utilize hydraulics Theoretical Resistance knowledge, realize scientifically and rationally the calculating to vegetation riverbed base drag, fill up the blank that contains vegetation river course resistance research field, also provide technical support for the city river planning and designing simultaneously.
Technical solution of the present utility model: the variable sloping tank system of circulation that is used for the river course, simcity, its structure is to comprise reservoir, pumping conduit, variable frequency pump, the par grid, the upstream is supported, the downstream is supported, tail-gate, the sluicing pond, backwater gallery and tank, wherein a termination of pumping conduit enters reservoir, one end of the other end of pumping conduit and ultrasonic flowmeter joins, a join end of variable frequency pump of the other end of ultrasonic flowmeter, one termination of variable frequency pump enters tank, tank communicates with the sluicing pond by tail-gate, the sluicing pond communicates with reservoir by the backwater gallery, the par grid is housed in the tank, on the tank, the downstream is provided with fixing nonadjustable upstream and supports, adjustable downstream is supported, and the upstream is supported apart from upstream water inlet 2m; The downstream is supported apart from downstream delivery port 3.5m.
The beneficial effects of the utility model: 1) by variable sloping circulating water chennel system, can simulate the city river of different hydraulics; 2) by the vegetation fixed system, can simulate natural in esse variety classes vegetation, and can accomplish the different arrangement modes of vegetation, the simulation of different vegetation density; 3) the ingenious hydraulics Theoretical Resistance knowledge of utilizing draws vegetation riverbed base drag under the different hydraulics, can fill up to contain vegetation river course Bed Resistance research blank, replenishes relevant city river planning and design specification.
Description of drawings
Fig. 1-the 1st, circulating water chennel system top view.
Fig. 1-2 is circulating water chennel system side view.
Fig. 2-the 1st, simulation vegetation fixed system top view.
Fig. 2-the 2nd, simulation vegetation fixed system lateral view.
Fig. 3 a be contain vegetation resistance to water-flow equivalence decompose in the control volume be △
x*
B*
hThe schematic diagram of vegetation possessive volume in the water body.
Fig. 3 a1 is the schematic diagram that contains the base slope that vegetation resistance to water-flow equivalence only causes by vegetation in decomposing.
Fig. 3 a2 is the schematic diagram that contains the base slope that vegetation resistance to water-flow equivalence only causes by bed surface in decomposing.
Among the figure 1 is reservoir, the 2nd, pumping conduit, the 3rd, ultrasonic flowmeter, the 4th, variable frequency pump, the 5th, par grid, the 6th, rule, the 7th, upstream support, the 8th, downstream support, the 9th, tail-gate, the 10th, sluicing pond, the 11st, backwater gallery, the 12nd, tank.
The specific embodiment
Vegetation riverbed base drag is fixed system really, and its structure comprises for the variable sloping tank system of the circulation in river course, simcity, simulation vegetation fixed system, physical quantity system;
As shown in Figure 1, the variable sloping tank system of circulation that is used for the river course, simcity, its structure comprises reservoir 1, pumping conduit 2, variable frequency pump 4, par grid 5, the upstream supports 7, the downstream supports 8, tail-gate 9, sluicing pond 10, backwater gallery 11 and tank 12, wherein a termination of pumping conduit 2 enters reservoir 1, one end of the other end of pumping conduit 2 and ultrasonic flowmeter 3 joins, a join end of variable frequency pump 4 of the other end of ultrasonic flowmeter 3, one termination of variable frequency pump 4 enters tank 12, 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 the tank 12, tank 12 long 12m, wide 0.42m, high 0.70m, tank 12 both sides are the glass edge wall, marble slab is laid in tank 12 bottoms, on the tank 12, the downstream is provided with the upstream and supports 7, the downstream supports 8, and upstream support 7 is fixing non-adjustable, and the upstream supports 7 apart from upstream water inlet 2m; It is 8 adjustable that the downstream is supported, and the downstream supports 8 apart from downstream delivery port 3.5m.
The downstream is supported 8 and is provided with gear and lifting screw in order to regulate base slope; During work, current are the suction tank after variable frequency pump 4 work, and par grid 5 is used for correcting flow direction, and current enter sluicing pond 10 through tail-gate 9, then returns reservoir 1 by backwater gallery 11 and realizes circulation;
Simulation vegetation fixed system is planted vegetation in city river in order to simulation, implants experimental trough for making vegetation, and selecting that the plastic plate of intensive boring is arranged is carrier; Then design in the boring on several vegetation insertion plastic plates; Again plastic plate is inserted tank, namely realized the implantation of vegetation in the tank; Such as Fig. 2-1, Fig. 2-2;
The physical quantity system, the fundamental physical quantity of required measurement comprises flow, water level and base slope;
The parameter that must consider when described flow is design, for the purpose of accurately, choice for use ultrasonic flowmeter 3 carries out the measurement of flow;
Described water level is according to the design needs, arranges rule 6 at the tank sidewall, and precision is 1mm; The method can be removed the trouble of regulating chaining pin from measure the method for water level at upstream and downstream designated water level chaining pin different, can save consuming timely when satisfying precision, and certain superiority is arranged;
Described base slope is to regulate by the liftable screw rod near the downstream delivery port, and to the accuracy that the precision direct relation resistance of its measurement calculates, the present invention determines the tank base slope by level gauge; Specifically comprise 1) tank is carried out calibration, utilize level gauge that tank is set as flat slope; 2) record respectively the discrepancy in elevation △ of flat slope and design conditions lower flume downstream end
h, and the distance of tank upstream fixed support and tank downstream end is
L, then base slope is △
h/
L
Definite method of vegetation riverbed base drag comprises
To simulate vegetation according to the vegetation arrangement mode of design and insert in the plastic board hole, thus the formation zone of vegetation, and the plastic plate that then will be inserted with vegetation is positioned over the bottom of gullet shown in Fig. 1-1, Fig. 1-2.
Make it equal design discharge by regulating variable frequency pump 4 control inlet flow rates
Q, support 8 until reach the degree of depth of design head by repeatedly regulating tail-gate 9 and downstream again
h, specific practice is: when upper pond level is higher than the level of tail water, by regulating downstream support 8 base slope is strengthened; Otherwise then be that base slope reduces.When the whole depth of water during greater than design head, increase the aperture of tail-gate 9; Otherwise then reduce the aperture of tail-gate 9.After reaching design head, calculate corresponding base slope
iIn addition, calculate the shared water body volume ratio of vegetation according to quantity and the water body stereometer of vegetation
η
Close variable frequency pump, the vegetation that is inserted on the plastic plate is Removed All; Reopen variable frequency pump and control flow
Q, continue by regulating tail-gate and lifting screw until the degree of depth of the depth of water
h(1-
η), calculate corresponding base slope
i B
All there are certain roughness in the bed surface of tank and the vegetation on the bed surface and rough, thus the flowing of retardance current, thereby tank need form certain base slope and can guarantee to form Uniform Flow.Consider that total base slope is
iContain the vegetation open channel uniform flow, shown in Fig. 3 a, according to the resistance superposition theory, can will contain the virtual two parts that are divided into of vegetation current: the vegetation effect is only arranged and the bed surface effect is only arranged, then total base slope
iCan regard as by two parts and be formed by stacking: the base slope that is only caused by vegetation
i V (Fig. 3 a
1) and the base slope that only caused by bed surface
i B (Fig. 3 a
2).So have:
Take the volume of control shown in Fig. 3 a as △
x*
B*
hWater body be research object, wherein
BFor tank wide, this part water body component along water (flow) direction that is subject to conducting oneself with dignity
F G , vegetation is to the resistance of this part water body
F V , and bed surface is to the resistance of this part water body
F B Can be got by equilibrium of forces:
(2)
△
x*
B*
hWater body in vegetation occupy certain volume, actual water body effective volume is
, therefore
F G Can be expressed as:
Wherein
Be water body density,
Be acceleration of gravity.Similarly, by Fig. 3 a
1Can get:
Such as Fig. 3 a
2Shown in, in the situation that the bed surface effect is only arranged, owing to there has not been the shared volume of vegetation, suppose that equivalent water-depth is
, then have
Convolution (1)～formula (5) can get
Then in actual experiment, only need carry out the depth of water and be
hContain vegetation uniform-flow flume experiment and the depth of water is
Without vegetation uniform-flow flume experiment, get final product to get vegetation riverbed base drag and account for the proportion of total water current resistance, wherein:
Vegetation riverbed base drag on the unit riverbed area is
Its proportion that accounts for the total water current resistance is
Embodiment
Contain vegetation tank design discharge 10.1L/s, design head is 12cm, the long 12m of tank, wide 0.42m, the simulation vegetation is chosen the rigid cylindrical rod, highly be 6cm, diameter is 0.6cm, and the vegetation arrangement mode is for being arranged in parallel on the plastic plate, adjacent two strain vegetation fore-and-aft distance 5cm, lateral separation 2cm, base slope is 3.68/1000 when having recorded vegetation, base slope was 2/10000 when vegetation was removed.
According to simulation vegetation geometric parameter and the depth of water that data provides, calculate easily the shared water body volume ratio of vegetation
So the base drag on the unit riverbed area is 42.71cm
2/ s
2, its proportion that accounts for the total water current resistance is 5.43%.
Claims (2)
1. the variable sloping tank system of circulation that is used for the river course, simcity, it is characterized in that comprising reservoir, pumping conduit, variable frequency pump, the par grid, the upstream is supported, the downstream is supported, tail-gate, the sluicing pond, backwater gallery and tank, wherein a termination of pumping conduit enters reservoir, one end of the other end of pumping conduit and ultrasonic flowmeter joins, a join end of variable frequency pump of the other end of ultrasonic flowmeter, one termination of variable frequency pump enters tank, tank communicates with the sluicing pond by tail-gate, the sluicing pond communicates with reservoir by the backwater gallery, the par grid is housed in the tank, on the tank, the downstream is provided with fixing nonadjustable upstream and supports, adjustable downstream is supported, and the upstream is supported apart from upstream water inlet 2m; The downstream is supported apart from downstream delivery port 3.5m.
2. the variable sloping tank system of the circulation for the river course, simcity according to claim 1 is characterized in that the long 12m of tank, wide 0.42m, and high 0.70m, the tank both sides are the glass edge wall, bottom of gullet is laid marble slab.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320277886 CN203238590U (en) | 2013-05-21 | 2013-05-21 | Cyclic variable slope water channel system for simulating city watercourse |
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|---|---|---|---|
| CN 201320277886 CN203238590U (en) | 2013-05-21 | 2013-05-21 | Cyclic variable slope water channel system for simulating city watercourse |
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| CN 201320277886 Expired - Fee Related CN203238590U (en) | 2013-05-21 | 2013-05-21 | Cyclic variable slope water channel system for simulating city watercourse |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852567A (en) * | 2014-03-31 | 2014-06-11 | 黄河水资源保护科学研究院 | Water environment simulator for reservoir |
| CN103898863A (en) * | 2014-03-07 | 2014-07-02 | 河海大学 | Device and method for studying sediment incipient motion under condition of non-submerged rigid plants |
| CN104090588A (en) * | 2014-03-12 | 2014-10-08 | 南通航运职业技术学院 | Automatic adjusting device and adjusting method for generating of uniform flows by open-trench experiment water channel |
| CN104596735A (en) * | 2014-12-17 | 2015-05-06 | 河海大学 | Optimal arrangement method of bridge group |
| CN104833478A (en) * | 2015-04-29 | 2015-08-12 | 山东科技大学 | Experimental apparatus and method for verifying roughness vector properties |
| CN106781882A (en) * | 2016-12-28 | 2017-05-31 | 中央民族大学 | The river environment monitoring experiment teaching system in laboratory is come into river |
| DE112020000365T5 (en) | 2020-01-10 | 2021-10-07 | China Three Gorges Corporation | Method for determining a flow velocity distribution of rough underlayer |
-
2013
- 2013-05-21 CN CN 201320277886 patent/CN203238590U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103898863A (en) * | 2014-03-07 | 2014-07-02 | 河海大学 | Device and method for studying sediment incipient motion under condition of non-submerged rigid plants |
| CN104090588A (en) * | 2014-03-12 | 2014-10-08 | 南通航运职业技术学院 | Automatic adjusting device and adjusting method for generating of uniform flows by open-trench experiment water channel |
| CN104090588B (en) * | 2014-03-12 | 2017-06-09 | 南通航运职业技术学院 | A kind of open channel experimental trough generates the self-checking device and adjusting method of uniform flow |
| CN103852567B (en) * | 2014-03-31 | 2015-09-23 | 黄河水资源保护科学研究院 | Reservoir water environment simulator |
| CN103852567A (en) * | 2014-03-31 | 2014-06-11 | 黄河水资源保护科学研究院 | Water environment simulator for reservoir |
| CN104596735A (en) * | 2014-12-17 | 2015-05-06 | 河海大学 | Optimal arrangement method of bridge group |
| CN104596735B (en) * | 2014-12-17 | 2017-04-12 | 河海大学 | Optimal arrangement method of bridge group |
| CN104833478B (en) * | 2015-04-29 | 2017-05-03 | 山东科技大学 | Experimental apparatus and method for verifying roughness vector properties |
| CN104833478A (en) * | 2015-04-29 | 2015-08-12 | 山东科技大学 | Experimental apparatus and method for verifying roughness vector properties |
| CN106781882A (en) * | 2016-12-28 | 2017-05-31 | 中央民族大学 | The river environment monitoring experiment teaching system in laboratory is come into river |
| CN106781882B (en) * | 2016-12-28 | 2023-11-10 | 中央民族大学 | River environment monitoring experiment teaching system for river running into laboratory |
| DE112020000365T5 (en) | 2020-01-10 | 2021-10-07 | China Three Gorges Corporation | Method for determining a flow velocity distribution of rough underlayer |
| DE112020000365B4 (en) | 2020-01-10 | 2022-09-15 | China Three Gorges Corporation | Method for determining a rough underlayer flow velocity distribution |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 Termination date: 20160521 |