CN108677896A - A kind of rice field field stores rain and automatically controls discharge outlet door - Google Patents

A kind of rice field field stores rain and automatically controls discharge outlet door Download PDF

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CN108677896A
CN108677896A CN201810281475.0A CN201810281475A CN108677896A CN 108677896 A CN108677896 A CN 108677896A CN 201810281475 A CN201810281475 A CN 201810281475A CN 108677896 A CN108677896 A CN 108677896A
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overflow
rice
field
flashboard
rice field
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CN108677896B (en
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梁森
韩莉
刘敏昊
韩栋
刘泽山
周倩倩
李慧娴
倪步銮
耿德刚
朱艳
尹萌
薛熠莹
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B13/00Irrigation ditches, i.e. gravity flow, open channel water distribution systems

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Abstract

A kind of rice field field stores rain and automatically controls discharge outlet door, include the overflow flashboard of gate slot and N number of different size with osculum and stopple, gate slot is mounted on the ridge between rice field and gutter or field drainage pipe front, gate kerve top is concordant with rice field surface, and ridge is flushed with or slightly higher than with ridge at the top of gate slot;Plane where the lower edge of overflow flashboard osculum is equal to the water storage upper limit depth of growth period duration of rice with the vertical range on gate kerve top, and the vertical range of plane where plane separation gate kerve top is equal to the interim water storage upper limit depth of growth period duration of rice where overflow flashboard top;Overflow sharp-crested weir height and overflow sharp-crested weir width are calculated by design water drainage standard, the interim water storage upper limit and rice field area to be determined;The quantity of osculum, aperture and position according to rice field area and the interim water storage upper limit and the water storage upper limit of certain breeding time and allow the stagnant storage time to calculate determination on overflow flashboard.The present invention can realize that rice field stores automatically controlling for rain drainage index.

Description

A kind of rice field field stores rain and automatically controls discharge outlet door
Technical field
The present invention relates to a kind of field drainage building, especially a kind of rice field field stores rain and automatically controls discharge outlet door, Belong to irrigation and water conservancy and fills row field.
Background technology
China's rice growing season heavy rain is more, and paddy field drainage amount is big, and the rice field under high dose easily makes a large amount of nitrogen phosphorus with row Flow is lost, and water body environment is caused to deteriorate.In recent years, Hohai University, Wuhan University etc. carry out rice storage rain control filling and rice ditch field Collaborative Control fills drainage technique and studies application item, proposes that rice workspace water storage control filling and ditch field Collaborative Control fill drainage technique, that is, is protecting While holding relatively low irrigation low limit, improve water-storage depth after rain, with make full use of rice drought resisting, it is resistance to flood characteristic, improve rainfall Utilization ratio, while draining is intercepted using farmland, farm ditch, using the wetland effect of farm ditch and farmland, reduce displacement and nitrogen Phosphorus concentration, reduce pollutant burden, achievement China rice belt be widely applied, various regions application the result shows that:It irrigates More conventional by norm to basin irrigation reduction 20~55%, drainage quota reduces 25~70%, and rainfall utilization ratio increases by 30~50%, irrigates Water production efficiency improves 45~85%, and the nitrogen and phosphorus load in unit area farmland reduces by 70%, play it is good it is water-saving subtract it is dirty, anti- Dirty, high-quality, efficient function and effect.
But rice stores rain control filling and rice ditch track and field association with irrigation technique as 16 province's Rice Cropping of current south China The advanced water-saving and emission-reducing technology that area promotes finds, existing rice field field drainage mouth door generally uses during promoting and applying DN100~DN300 concretes prefabricated pipe, pvc pipe directly excavate embanked field stalk draining to Yao Gou, Mao Gou, and the current country there is no automatic control Rice field pumping equipment processed, in rainfall, the person of discharging water or peasant household determine to open or block discharge outlet according to paddy field drainage experience, Cause popularization area that cannot fill row's system in strict accordance with water storage control, realization accurately control draining, it is high to be unfavorable for rice water-saving emission reduction The water management of production;And it is long last thunderstorm rain when, the person of discharging water or peasant household field emit thunderstorm draining, and drainage works amount is big and operation Danger it is high.
Invention content
In order to overcome the above-mentioned deficiency of the prior art, a kind of rice field field of present invention offer to store rain and automatically control discharge outlet Door can realize that rice field stores automatically controlling for rain drainage index, can fill up the sky that field automatically controls discharge structure In vain.
The present invention solve its technical problem the technical solution adopted is that:Including gate slot and N number of different size band osculum And the overflow flashboard of stopple, gate slot is mounted on the ridge between rice field and gutter or field drainage pipe front, gate bottom Plane where slot top is concordant with rice field surface, and the plane where at the top of gate flushes with or slightly higher than ridge with ridge;Overflow Flashboard is installed in gate slot, wherein plane is put down with where gate kerve top where the lower edge of osculum on overflow flashboard The vertical range in face is equal to the water storage upper limit depth of growth period duration of rice, plane separation gate kerve top institute where overflow flashboard top It is equal to the interim water storage upper limit depth of breeding time in the vertical range of plane;Where at the top of gate slot at the top of plane to overflow flashboard The vertical range of place plane is overflow sharp-crested weir height, and B is overflow sharp-crested weir width, overflow sharp-crested weir height and overflow thin-walled Weir width is calculated by design water drainage standard, the interim water storage upper limit and rice field area and is determined;The number of osculum on the overflow flashboard Amount, aperture and position are according to rice field area and the interim water storage upper limit and the water storage upper limit of breeding time and the stagnant storage time is allowed to calculate really It is fixed.
Compared with prior art, a kind of rice field field of the invention stores rain and automatically controls discharge outlet door, including gate slot and N number of Overflow flashboard of the different size with osculum and stopple, according to the interim water storage upper limit and water storage of rice field area and different growing The upper limit calculates the quantity of osculum, hole in the size and relative position relation and overflow flashboard that determine gate slot and overflow flashboard Diameter and position, to realize following purpose:
(1) when occurring to be greater than or equal to the heavy rain of design water drainage standard, higher than the interim water for storing the rain upper limit, in rainfall In period, it is discharged rapidly by overflow flashboard top;
(2) allowing in the stagnant storage time (after rain 24 hours), the interim water stored between the rain upper limit and the water storage upper limit passes through Osculum discharge on overflow flashboard;
(3) at the end of allowing the stagnant storage time (after rain 24 hours), water storage level control in rice field is in water storage upper limit position.
The present invention is not required to the artificial field work of storm period, can realize that rice field automatically controls row according to design drainage index Water can reduce rice field filling row's number and fill displacement, improve research advances and water production efficiency, reach water-saving, subtract dirt, Efficiently, the target of saving of labor.The present invention is also simple in structure, easy to make, at low cost, is not necessarily to power, without artificial on duty, is suitable for Vast paddy fields Field information has wide popularizing application prospect.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the structural schematic diagram of one embodiment of the invention.
Fig. 2 is the structure chart of stopple in Fig. 1.
In figure, 1, gate slot, 2, overflow flashboard, 3, flashboard knob, 4, osculum, 5, ridge, 6, stopple, 7, connecting rope.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people The every other embodiment that member is obtained without making creative work, belongs to protection scope of the present invention.
In Fig. 1 and embodiment illustrated in fig. 2, including gate slot 1 and N number of different size overflowing with osculum 4 and stopple 6 Flashboard 2 is flowed, gate slot 1 is mounted on the ridge 5 between rice field and gutter or field drainage pipe front, gate kerve (gate Kerve refers to the part that gate slot 1 is embedded under the face of field, its top is the bottom of gate clear height, and gate is inserted into gate kerve) Plane (i.e. in figure the places A plane) where top is concordant with rice field surface, and the plane where 1 top of gate slot (is schemed The middle places D plane) with ridge 5 flush with or slightly higher than ridge 5;Overflow flashboard 2 is installed in gate slot 1, wherein overflow lock Plane where osculum 4 lower edge on plate 2 (i.e. in figure the places B1 plane) and kerve top (field face) place plane The vertical range of (i.e. in figure the places A plane) is equal to the water storage upper limit depth H of some breeding time of rice2, the top of overflow flashboard 2 Plane where portion (i.e. in figure the places C plane) plane where away from gate kerve top (field face) (i.e. in figure the places A put down Face) vertical range be equal to breeding time interim water storage upper limit depth H1;(i.e. the places D exist plane in figure where 1 top of gate slot Plane) to the vertical range of plane where the top of overflow flashboard 2 (i.e. in figure the places C plane) be overflow sharp-crested weir height Degree, B are overflow sharp-crested weir width, overflow sharp-crested weir height and overflow sharp-crested weir width by design water drainage standard, interim water storage Limit and rice field area, which calculate, to be determined;Quantity, aperture and the position of osculum 4 are according to rice field area and certain on the overflow flashboard 2 The interim water storage upper limit of a breeding time is calculated and is determined with the water storage upper limit and permission stagnant storage time.
It designs as a further improvement, an end of the stopple 6 is equipped with the connecting rope 7 being connected with flashboard knob 3. Flashboard knob 3 can also be installed at the top of the overflow flashboard 2, in rice different growing, to replace overflow flashboard 2。
In the present embodiment, the stopple 6 can select the materials such as rubber, timber, PVC or concrete to make.It is described The shape of osculum 4 can be the polygons such as circle, rectangle, square or triangle on overflow flashboard 2.1 He of the gate slot The shape of overflow flashboard 2 is consistent, is rectangle, trapezoidal or triangle etc..The overflow flashboard 2 and gate slot 1 select PVC, steel Material, timber or concrete material etc. are made.
The present invention predominantly promotes rice to store rain control filling and the filling drainage technique popularization and application of ditch field Collaborative Control and invent, and leads The Con trolling index is wanted to be:
1 rice ditch field Collaborative Control of table fills the water consumpation Con trolling index of drainage technique
It is the water storage control row for strictly implementing rice each breeding time in rice ditch field Collaborative Control fills drainage technique popularization and application Index, need to solve present situation has discharge outlet door but can not automatically control drainage index, or is arbitrarily excavated without field control discharge outlet door The problem of ridge 5 drains realizes that the accurate of field drainage automatically controls in strict accordance with rainfall water storage design objective.Other rice, Paddy field, dry land fill row's system or cistern, dyke sewer system etc., can refer to the design concept of the present invention.
Technical principle:
(1) water drainage standard is designed
The rice field field of the present invention stores rain and automatically controls discharge outlet door, according to high standard farmland design criteria for surface drainage:Day rain It is discharged within 1 day after 200mm rain.
(2) on overflow flashboard 24 aperture of osculum design
This example calculates rice field reserve-water-level, reservoir storage and displacement using average rainfall intensity method.
Rice field is generally lattice field or embanked field, area F (m2);
Osculum 4 needs 24 hours after the rain on overflow flashboard 2, and rice breeding time interim water storage upper limit H is discharged1With storage Limit H waterborne2Between depth of water H0, H0=H1-H2(m);
It is W=F*H that interim stagnant reservoir storage need to be discharged altogether0=F* (H1-H2)(m3);
The osculum 4 of overflow flashboard 2 can be one or N number of, and the height of 4 lower edge of bottom osculum is equal to rice water storage The upper limit, the present embodiment take an osculum 4 to design;
Osculum 4 is H with elevation difference of field surface2, it is higher than downstream drainage ditch water level, is free discharge, flow formula is
QtFor orifice flow (m3/s);
A is orifice area A=π D2/4(m2), D is orifice diameter (m);
HtFor the head (m) in some time point aperture,
G is acceleration of gravity;
μ is orifice-metering coefficient;For thin-walled circle microstome,ε=0.63~0.64, μ=0.60~0.62;
T is that draining lasts, T=1~24 (h), and other symbols are the same;
QtFor the average flow rate of certain period flashboard osculum 4, (m3/s);
Ht is the height difference of certain period field water position and 4 central point of flashboard osculum, (m);
By above formula, it can be assumed that 4 aperture of flashboard osculum is D, some period is calculated at times by Excel tables HtAnd Qt, designed displacement W was equal to by accumulative 24 hours flow summations, tentative calculation goes out 4 aperture D values of flashboard osculum, determines The aperture D of osculum 4;It can also be determined by field drainage test observation method.
Now with rice field area:20*50m2=500m2, the interim water storage upper limit 100mm of period of seedling establishment, water storage upper limit 70mm after rain, The water that must be discharged through osculum 4 is W=500m2* (100mm-70mm)/1000=15m3, water discharge time is 24 hours after rain. By following table tentative calculation, determine that aperture is 29mm.
Osculum aperture D and designed displacement trial balance on 2 overflow flashboard of table
It can go out 4 aperture of osculum under different rice field areas, different growing drainage index by above method with tentative calculation, Such as following table:
3 rice field area of table drains aperture relation table with flashboard
Note:Such as rice field area 1000m2, period of seedling establishment 5*25, wherein 5 represent 5 osculums 4,25 and represent aperture as 25mm.
As can be seen from the above table, when rice field area is less than 500m2, 1 osculum 4;When rice field area is more than 500m2, The aperture of one osculum 4 is likely larger than the distance between the interim water storage upper limit and the water storage upper limit after rain, needs to arrange multiple rows Water hole 4, if rice field area is 2000m2, period of seedling establishment overflow flashboard 2 can be by 4 500m2Field opens 4 holes ¢ 29mm, or presses 5 A 400m2Field opens 5 holes ¢ 25mm, or presses 8 200m2Field opens 8 holes ¢ 18mm.
The clear height L of 4 overflow flashboard of table and draining hole site
Overflow flashboard label 1# flashboards 2# flashboards 3# flashboards 4# flashboards
The clear height H (mm) of overflow flashboard 100 150 150 200
Osculum lower edge is away from field face height H2(mm) 70 80 100 150
(3) design of gate widths B
The present invention is designed to that water will be in duration of raining when heavy rain generates height of run-off and is more than the interim water level for storing the rain upper limit Interior, the rectangle thin-wall weir free discharge being made up of with gate slot 12 top of overflow flashboard is discharged into mao ditch or waist ditch.
1) design storm is more than the interim depth of runoff and displacement for storing the rain upper limit
Depth of runoff:RRice=P-S-ERice
In formula:P --- design rainfall, P=200mm;
Stagnant water storage is deep temporarily in S --- rice field, and S=breeding times is taken to store water depth mm before the rain upper limit-rain temporarily;With tiller It is interim to store rain upper limit 150mm for mid-term, it is assumed that water depth is 10mm, S=140mm before rain;
E --- rice field water consumption intensity (mm/d);
Rice field water consumption intensity ERice(mm/d) can be determined according to the infiltration coefficient of testing data or soil, calculated by above-mentioned parameter Rice field water yield RRice
Design Overflow drainage amount:W=RRice*F/1000
In formula:W --- Overflow drainage total amount, (m3);
F --- rice field area, (m2)。
2) the Overflow drainage time of overflow flashboard 2
Rice field is to reduce to drain, raising rainfall effective rate of utilization, and the osculum 4 of overflow flashboard 2 is 6 closed of stopple before rain State opens the draining of flashboard osculum 4 after rain again if design storm occurs, when design storm, according to average rainfall intensity and rice field The overflow time started of water consumption Strength co-mputation overflow flashboard 2.
The overflow time started T of overflow flashboard 21=24S/ (P-ERice),(h);
Overflow drainage total time T2=24-T1, (h).
3) Overflow drainage flow
When design storm, which generates height of run-off, is more than the interim water level for storing the rain upper limit, draining passes through 2 top of overflow flashboard The rectangle thin-wall weir free discharge constituted with gate slot 1 is discharged into Mao Gou, Yao Gou, suitable for there is side to shrink rectangle thin-wall weir free flow Flow formula, formula are:
In formula:H is head on weirs, (m);
B is that weir crest is wide, i.e. gate clear span, (m);
m0For discharge coefficient, can be determined by Bao Gu proficiency island formula:
B0For field face width, (m);
P is the height difference in field face and flashboard top, (m).
4) now with rice field area 20*50m2For:
Design storm is day rain 200mm, it is assumed that the preceding rice field water depth of rain is 10mm, and E is rice field water consumption intensity 4mm/d; Rain upper limit 100mm is stored temporarily by the maximum period of seedling establishment of displacement;
Depth of runoff:RRice=P-S-ERice=200-100-4=96mm
Design Overflow drainage total amount:W=RRice* F/1000=96m3
1. the Overflow drainage time of overflow flashboard 2
The overflow time started T of overflow flashboard 21=24S/ (P-ERice)=24*100/ (200-4)=12.24 (h);
Overflow drainage total time T2=24-T1=11.76 (h).
2. Overflow drainage flow
The runoff generated according to rainfall concentrate on being discharged in 1 hour it is less favorable under the conditions of calculate drain discharge Q:Q= P1* A/3600=96*1000/1000/3600=0.02667m3/s;
When design storm, which generates height of run-off, is more than the interim water level for storing the rain upper limit, draining passes through 2 top of overflow flashboard The rectangle thin-wall weir free discharge constituted with gate slot 1 is discharged into Yao Gou, Mao Gou, drains in the period, suitable for there is side to shrink rectangle Sharp-crested weir free flow flow formula, average flow rate formula are:
In formula:H is head on weirs, since 5 clear height of ridge is generally 0.30m, period of seedling establishment flashboard clear height 0.10 (m), to keep away Exempt from water level in paddy field and overflow ridge 5, maximum allowable head is 0.20m on flashboard;
B is that weir crest is wide, i.e. gate clear span, (m);
m0For discharge coefficient, it can refer to Bao Gu proficiency island formula and calculate, take approximation:m0=0.41;
Period of seedling establishment gate clear span
Other breeding time designed displacements are respectively less than period of seedling establishment, therefore field drainage port strobe clear span is determined with period of seedling establishment, 500m2Following field, Overflow drainage gate clear span take 0.15m, can meet draining needs;The Overflow drainage of other rice field areas Gate clear span, is shown in Table 5.
The relation table of table 5 different rice terrace areas and gate clear span B
The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, it is every according to According to the technical spirit of the present invention, any simple modification and same variation are made to above example, each fall within the guarantor of the present invention Within the scope of shield.

Claims (10)

1. a kind of rice field field, which stores rain, automatically controls discharge outlet door, it is characterized in that:Including gate slot (1) and N number of different size band The overflow flashboard (2) of osculum (4) and stopple (6), gate slot (1) be mounted on ridge (5) between rice field and gutter or Field drainage pipe front, the plane where gate kerve top is concordant with rice field surface, the plane where at the top of gate slot (1) with Ridge (5) flushes with or slightly higher than ridge (5);Overflow flashboard (2) is installed in gate slot (1), wherein the row of overflow flashboard (2) The vertical range of plane where the lower edge in water hole (4) and plane where gate kerve top is equal in the water storage of growth period duration of rice Depth is limited, the vertical range of plane where the plane separation gate kerve top of place is equal to facing for breeding time at the top of overflow flashboard (2) When water storage upper limit depth;The vertical range of place plane is overflow at the top of plane to overflow flashboard (2) where at the top of gate slot (1) Sharp-crested weir height, B be overflow sharp-crested weir width, overflow sharp-crested weir height and overflow sharp-crested weir width by design water drainage standard, face When the water storage upper limit and rice field area calculate determine;On the overflow flashboard (2) quantity, aperture and the position of osculum (4) according to The interim water storage upper limit of rice field area and breeding time are calculated and are determined with the water storage upper limit and permission stagnant storage time.
2. a kind of rice field field according to claim 1, which stores rain, automatically controls discharge outlet door, it is characterized in that:The overflow lock Osculum (4) on plate (2) can be one or N number of;When rice field area is less than 500m2, the osculum on overflow flashboard (2) (4) quantity can take 1, when rice field area is more than 500m2, preferably arrange multiple osculums (4), particular number value reference table 3:
3 rice field area of table arranges table with flashboard draining hole number and aperture
3. a kind of rice field field according to claim 2, which stores rain, automatically controls discharge outlet door, it is characterized in that:Rice difference is given birth to Educate the clear height H of the overflow flashboard (2) of phase use1Plane separation field face height H where value and osculum (4) lower edge2With reference to table 4:
4 rice different bearing of table is using flashboard clear height and draining hole site
4. a kind of rice field field according to claim 2, which stores rain, automatically controls discharge outlet door, it is characterized in that:Overflow flashboard (2) clear span B is determined with the design drain discharge of period of seedling establishment;500m2Following field, B preferably uniformly take 0.15m, 500m2The above field Block, specific value reference table 5:
The relation table of table 5 different rice terrace areas and gate clear span B
Rice field area (m2) Flow (m3/s) Calculated value B (m) Design value B (m) 500 0.013333 0.081301 0.15 1000 0.026667 0.162602 0.20 1500 0.04 0.243902 0.25 2000 0.053333 0.325203 0.35 3000 0.08 0.487805 0.50 4000 0.106667 0.650407 0.70 5000 0.133333 0.813008 0.85 6000 0.16 0.97561 1.00 8000 0.213333 1.300813 1.30 10000 0.266667 1.626016 1.65
5. a kind of rice field field according to claim 1 or 2 or 3 or 4, which stores rain, automatically controls discharge outlet door, it is characterized in that: Flashboard knob (3) is also equipped at the top of the overflow flashboard (2).
6. a kind of rice field field according to claim 1 or 2 or 3 or 4, which stores rain, automatically controls discharge outlet door, it is characterized in that; One end of the stopple (6) is equipped with the connecting rope (7) being connected with flashboard knob (3).
7. a kind of rice field field according to claim 6, which stores rain, automatically controls discharge outlet door, it is characterized in that:The stopple (6) rubber, timber, PVC, metal or concrete material is selected to make.
8. a kind of rice field field according to claim 1 or 2 or 3 or 4, which stores rain, automatically controls discharge outlet door, it is characterized in that: The shape of osculum (4) is circle, rectangle, square or triangle on the overflow flashboard (2).
9. a kind of rice field field according to claim 1 or 2 or 3 or 4, which stores rain, automatically controls discharge outlet door, it is characterized in that: The gate slot (1) is consistent with the shape of overflow flashboard (2), is rectangle, trapezoidal or triangle.
10. a kind of rice field field according to claim 1 or 2 or 3 or 4, which stores rain, automatically controls discharge outlet door, it is characterized in that: The overflow flashboard (2) and gate slot (1) select PVC, steel, timber or concrete material to be made.
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