CN1110401A - Water flow rating method and device for water-distributing gap in irrigation area - Google Patents
Water flow rating method and device for water-distributing gap in irrigation area Download PDFInfo
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Abstract
The present invention provides a water discharge rating method for water distrubution outlet of irrigation area and its device. Said invention uses a discharge rating method for implementing general discharge measurement in irrigation area. It uses the original headworks of irrigation area and uses current meter to measure rate of flow on the selected distribution outlet section according to the requirements of said rating method, and calculates the discharges in different water-stages, and draws the stage-discharge relation curve diagrams of all distribution outlets, so that according to the different water-stage value the correspondent discharge value can be looked out, and a stage-discharge relation table can be fomred. When measuring discharge, one just needs to look at the stage value of water-level gage of distribution outlet, the discharge can be read out from the table, and the discharge time is recorded, so that the discharge quantity can be known.
Description
The present invention relates to the assay method of a kind of irrigated area, pumping plant irrigation distributed water flow, particularly a kind of irrigated area, pumping plant are irrigated the rating method and the device thereof of water-distributing gap water gaging.
Present domestic irrigated area situation is: relatively more rich irrigated area is to the novel current measuring instrument development of installing, but round Realization is few with apparatus measures, long because of the irrigated area circuit, the zone is wide, and water-distributing gap is numerous, the advanced current measuring instrument of installing is invested huge, the irrigated area is difficult to bear mostly, moreover the operation technique of current measuring instrument is complicated, broad masses are difficult for grasping, and are difficult to promote; There is the minority irrigated area to build part flume (no larynx, Pasteur); There is the distribution structure of minority key in large-scale irrigated area, and the check gate place utilizes current meter to carry out flow measurement.Through patent retrieval CNPATCO-ROM(1985～1992) database, do not see that measuring discharge adopts rating method and device thereof.
External different with China's national situation, developed country's irrigated area water gaging is to the accurate current measuring instrument development of installing, does not also find to adopt in full irrigated area the data and the information of rating method water gaging.
Task of the present invention is the actual conditions from China irrigated area, a kind of irrigated area, pumping plant is irrigated the method that water-distributing gap carries out calibration for what a great problem that solves the irrigated area water measurement provided, determines the corresponding relation of water level and flow, the general water gaging in realization irrigated area.This method is used simple and easy to do, small investment, and the irrigated area masses grasp application easily, can be country and save great amount of investment and expense.Calibration is to utilize the original canal structure in irrigated area, carries out flow measurement on selected water-distributing gap section, does not need newly to build engineering, also need not install current measuring instrument, the main current meter that adopts is measured flow velocity, makes water level～discharge relation table through conversion, tables look-up when practical and can determine the water-distributing gap flow.
Task of the present invention is finished as follows:
This rate gauge water method is to utilize current meter to carry out fluid-velocity survey on selected canal for water distribution section, according to the size of channel flow velocity, and can the large, medium and small three kinds of model current meters of corresponding employing (as selecting cup-type current meter for use).Each water level regulation of section is surveyed 2～3 surveys line, and every survey line adopts one point method to measure.Each section is surveyed three different water levels (peak level when containing normal irrigation), calculate three different flows corresponding to three different water levels, add that coordinate just has four somes zero point, can be at the H-Q(H-water level, the Q-flow) draw a curve on the coordinate system, again according to curve since 0, one centimetre of the every rising of water level, pairing flow all can be found out, has formed the H-Q relation table.On the water gaging section sidewall that each is measured, draw water gauge, during actual water gaging,, just can on the H-Q relation table, find flow, write down the water time again, just can calculate streamflow as long as see the water gauge water level.
The precision of calibration: 9 year spring watered beginning, and comprehensive water distribution calibration is carried out in 15 irrigated areas of eight counties and districts in the whole city, used calibration method water gaging since spring irrigation in 9 years, through using other method validation, the calibration error is not more than ± and 5%, total error is no more than ± and 5.23%, satisfy irrigated area water gaging requirement fully.
Below in conjunction with accompanying drawing and subordinate list invention is described further.
Fig. 1 (a) is trapezoidal water channel water-distributing gap sectional drawing.
Fig. 1 (b) is the sectional view of Fig. 1 (a) along I-I line.
Fig. 2 (a) is a rectangle water channel water-distributing gap sectional drawing.
Fig. 2 (b) is the sectional view of Fig. 2 (a) along II-II line.
Fig. 3 is a trapezoidal cross-section water channel water-distributing gap survey line arrangenent diagram.
Fig. 4 is a rectangular cross section water channel water-distributing gap survey line arrangenent diagram.
Fig. 5 is trapezoidal cross-section water-distributing gap water level-flow (H-Q) graph of relation.
Fig. 6 is rectangular cross section water-distributing gap water level-flow (H-Q) graph of relation.
With reference to Fig. 1, among the figure: the 1st, soil property or stone matter canal body, the 2nd, the canal surface, the 3rd, water gauge, at selected channel water-distributing gap section side-walls cement trowel finish, white lacquer bottom goes out water gauge red and white with red lacquer painting, and the every lattice of water gauge are not more than 2 centimetres.The 4th, the concrete of demarcating the water gauge place gives making sheet or tabia matter canal survey wall district.With reference to Fig. 2, generally be plain concrete or piece stone anti seepage channel body, the 1st, gool soil matrix, the 2nd, water channel inside surface, the 3rd, water gauge, the 4th, anti seepage channel body for the rectangle water channel.
Among Fig. 3, Fig. 4:
0,1,2,3,4-represents five surveys line, and wherein 0 is the benchmark survey line.
V
0, V
1, V
2, V
3, V
4-represent survey line 0,1,2,3,4 mean flow rate.
h
0, h
1, h
2, h
3, h
4-represent survey line 0,1,2,3,4 the depth of water.
Specific implementation method of the present invention and device thereof
1, instrument is equipped with:
1. flow measurement instrument: the shelves water plate (or woven bag of dress soil) that current meter (containing slide rule, sound box, stopwatch), steel tape, tape measure, No.5 cell, frame plate, change water level are used, spade etc.2. apparatus is write down in testing: record form, file, pencil.3. calculate apparatus: counter.4. drawing instrument: set square, drawing curve, pencil, rubber, pocket knife, rice ruled paper (16K), water level-discharge relation table.
2, the testing section is selected:
1. gaging section should be around selecting to the administrative village water supply direction, section can be controlled water ground, full village, just select one, two or more sections could be controlled water ground, full village, just select two or more sections, and with section be selected in that the canal section is straight, current evenly, the absence of vortices place of refluxing, vertical with water (flow) direction.2. selected calibration section is marked on the canal system present situation figure of irrigated area without exception, and unifies to number from the upstream to the downstream.3. put on water gauge at selected section part.
3, testing:
1. instrument accommodation: the current meter of being purchased has three kinds, and large-scale has two kinds, and small-sized is a kind of.Large-scale metal cup-type current meter is applicable to the channel flow measurement of big flow velocity, revolves glass revolution five circle registers and rings; The plastics cup-type current meter whenever turns around register sound once; Small-sized current meter is applicable to the situation of small-sized channel flow velocity below 0.5 meter per second.The using method of current meter is according to its instructions requirement.
2. the testing vertical line is arranged: canal cross section testing vertical line number should determine that dried, the branch canal of channel broad (1.5～5 meters) can be established 3～5 vertical lines according to the channel width; Canal cross section is less establishes 2～3 testing vertical lines, and the testing line is specifically arranged as Fig. 3, Fig. 4.Require survey line relatively to be evenly distributed on the gaging section.
3. datum line position: require the water surface and canal bank junction as datum line 0 point.
4. point position: one point method is all adopted in the mean flow rate testing of vertical survey line, is about to current meter and is placed on apart from 0.6 times of depth of water place (center line that revolves cup with current meter is as the criterion) below the water surface.
5. require the water level number of surveying: can both draw out the purpose of level-flow relation curve in order to reach each gaging section, require minimumly on same section will survey three different water levels, and will comprise the maximum stage of lowest water level and the satisfied requirement of irrigating the fields.Can take to change accordingly the water level method according to the concrete condition and the condition in testing irrigated area.
6. when testing channel usage factor at different levels, only survey a water level, promptly in the past irrigated the fields ordinary water level when discharging water, and require to treat to go again behind the stable level testing, the side is representative, must survey three times continuously under the same water level of same section, it is valid at last three measured values to be got its three mean values as calculated.
7. stopwatch and register (sound box) will be worked good during testing, make sure to keep in mind and to be as the criterion and to pinch table to ring number, after current meter is put into current and is given allocation, wait the register sound even, begin numeration again, numeration first sound is pinched table, numeration is zero, last ring to pinch table, writes down the sound equipment number earlier, and then sees stopwatch is write down and last number.Generally require a measuring point testing time to be no less than 120 seconds.
4, revolve the survey record:
1. revolve one group of minimum need three people when surveying, hold current meter testing one people, pinch the stopwatch people that finds range, write down a people, require the three people work of working in coordination.
2. survey the note order:
(1) surveys benchmark 0 line depth of water h
0(if water channel is a trapezoidal cross-section, then " 0 " puts depth of water h
0Be zero).
(2) amount vertical line " 1 " starting point square L
1(being the level distance of datum line " 0 ") to survey line " 1 ", and survey vertical line " 1 " depth of water h
1, be recorded in the form, current meter is put what survey line " 1 " depth of water h
10.6 times locate (apart from the depth of water place of 0.6 times of the water surface) and carry out testing, and note register sound equipment number and last a second number, surveyed for first.
(3) every according to said sequence and method testing vertical line " 2 ", " 3 ".
(4) the starting point square L of measurement vertical line " 4 "
4And depth of water h
4, and be recorded in the form, the same water level testing of this section so far finishes.
(5) change water level after, carry out the testing writing task of second water level according to the method described above, minimumly to survey three different water levels, (as Fig. 4) just finished in the testing work of a section.
5, calculate:
1. according to the testing record, the flow velocity V(that utilizes the flow velocity computing formula of this current meter to calculate each measuring point is a mean velocity in vertical).Vertical line " 0 " and " 4 " have only depth of water h for rectangular cross section, are provided with flow velocity V; For trapezoidal cross-section, both there be not the depth of water, there is not flow velocity yet.
2. part mean flow rate V
IpCalculating:
Middle two vertical lines " 1 " and " 2 "; The mean flow rate of " 2 " and " 3 " is the flow velocity of part between two vertical lines, and both sides are that the pull in to shore vertical line " 1 " and " 3 " flow velocity on limit multiply by a COEFFICIENT K by the part flow velocity of canal bank.
As Fig. 3, V
1P=V
1* K
V
2P＝1/2（V
1+V
2
V
3P＝1/2（V
2+V
3
V
4P＝V
3×K
COEFFICIENT K, for its numerical value difference of difform section, rectangular cross section: stone masonry antiseepage K=0.8
Concrete antiseepage K=0.9
The coarse person K=0.7 of trapezoidal cross-section: Tu Qu and antiseepage
Concrete antiseepage K=0.8
3. the wide b of part
iCalculating:
If the starting point square of survey line " 0 ", " 1 ", " 2 ", " 3 ", " 4 " is L
0, L
1, L
2, L
3, L
4, then
b
1＝L
1-L
0;b
2＝L
2-L
1;b
3＝L
3-L
2;b
4＝L
4-L
3
4. part mean depth h
i
Rectangle: h
0,1All=1/2(h
0+ h
1)
h
1,2All=1/2(h
1+ h
2)
h
2,3All=1/2(h
2+ h
3)
h
3,4All=1/2(h
3+ h
4)
Trapezoidal: both sides h
0=h
4=0
h
0,1All=1/2(O+h
1)
h
1,2All=1/2(h
1+ h
2)
h
2,3All=1/2(h
2+ h
3
h
3,4All=1/2(h
3+ 0)
5. part area f
i:
Rectangle: f
1=h
0,1All * b
1
f
2=h
1,2All * b
2
f
3=h
2,3All * b
3
f
4=h
3,4All * b
4
Trapezoidal: f
1=1/2(h
1* b
1)
f
2=h
1,2All * b
2
f
3=h
2,3All * b
3
f
4＝1/2（h
3×b
4）
6. partial discharge Q
i: part flow velocity V
IpMultiply by corresponding part area f
i, that is:
Q
1＝V
1p×f
1
Q
2＝V
2p×f
2
Q
3＝V
3p×f
3
Q
4＝V
4p×f
4
7. whole section flow: Q breaks=Q
1+ Q
2+ Q
3+ Q
4
8. whole cross-sectional area: f breaks=f
1+ f
2+ f
3+ f
4
9. mean velocity in section: V disconnected all=the disconnected ÷ f of Q is disconnected
10. section mean depth: h breaks all=(h
0,1All+h
1,2All+h
2,3All+h
3,4All) ÷ 4
6. draw section water level-flow (H-Q) curve map, as Fig. 6.
1. according to different water levels of the section that is calculated and flow, H(water level on the rice ruled paper)-and the Q(flow) point out corresponding point in the coordinate system, three corresponding three flows of water level can be pointed out three joints, add zero point, with drawing curve these four points are plotted curve, and the sectional drawing of this channel also is drawn on H-Q curve map below.
2. according to the H-Q curve 1 centimetre of whole interpolation of pairing flow number of the every rising of water level are come out, insert in water level-discharge relation table (seeing attached list 1).
3. testing channel usage factors at different levels: with the channel segmentation, carry out discharge measurement to section is first respectively with a section tail, and charge to stream-flow record table (table 2), by the section of calculating head, section wake flow amount, survey segment length, insert channel usage factor reckoner (table 3), and calculate usage factor and unit loss coefficient etc.
If 4. channel usage factor segmentation testing, then each section multiplication is the usage factor of whole channel.
5. with the one-level channel if there are many, then select several of representational surveys, then with the coefficient of each bar channel and separately design discharge weighted mean, in the hope of the mean utilization (seeing attached list 4) of this grade channel.
6. fill in the various statistical forms relevant with calibration work.
7, often work: flow measurement work is not to put things right once and for all, because of the channel in irrigated area is constantly changing, as becoming antiseepage, unaccelerated aging, artificial destruction, antiseepage renewal etc. by antiseepage not, the capital influences the variation of level-flow relation curve and the variation of canal system usage factor, this redeterminates with regard to the channel that has required at any time condition changing, certain accuracy could be kept, the management of irrigated area water could be served better.
8, can adopt the weir flow measurement for steeper small-sized channel
1. channel is steeper, flow velocity is excessive, flow under the less water level can satisfy the channel of irrigating the fields and requiring, can't use the current meter flow measurement, this canal section available quantity mill weir (Cipolletti weir, triangular-notch weir) flow measurement, the weir of selecting should conform to the weir size in " water gaging method of field irrigation " book, and manufactures by its technical requirement, can use listed flowmeter in the book.
2. each weir of making all will can use behind current-meter rating.
Subordinate list 1 irrigated area measuring structure water level-discharge relation table
Rate is fixed time: the date
Testing-record-calculating-check and correction-hosting-
Claims (5)
1, a kind of is the rating method of irrigated area water-distributing gap water gaging, it is characterized in that utilizing the original canal structure in irrigated area, on selected water-distributing gap section, carry out flow measurement, adopt current meter to measure flow velocity, calculate the flow value under the different water levels of same section, draw each water-distributing gap section water level--discharge relation curve map, by water level--the different water level values of the same section of discharge relation curve map are found corresponding flow value, constitute each section water level--discharge relation table, during actual water gaging, as long as see water-distributing gap water gauge water level value, water level at this section--find flow in the discharge relation table, write down the actual mistake water time again, i.e. irrigation water capacity as can be known, concrete rating method is:
The selection of a, testing section:
1. gaging section should be around selecting to administrative village water supply canal system direction, section can be controlled water ground, full village, just select one, two or more sections could be controlled water ground, full village, just select two or more sections, and with section be selected in that the canal section is straight, current evenly, the absence of vortices place of refluxing, vertical with water (flow) direction
2. selected calibration section is marked on the canal system present situation figure of irrigated area without exception, and unifies to number from the upstream to the downstream,
3. put on water gauge at selected section part,
B, layout testing vertical line:
1. section testing vertical line number is determined according to the channel width, and dried, the branch canal of channel broad (1.5～5 meters) can be established 3～5, and what canal cross section was less establishes 2～3, and the concrete arrangement requirement survey line of testing vertical line relatively is evenly distributed on the gaging section,
2. datum line position: require the water surface and canal bank junction as datum line zero point,
C, point position:
One point method is all adopted in the mean flow rate testing of vertical survey line, and soon current meter is placed on the water surface and locates (center line that revolves cup with current meter is as the criterion) for following 0.6 times,
D, the requirement water level number of surveying:
Can both draw out the purpose of level-flow relation curve figure in order to reach each gaging section, requirement is minimum on same section will survey three different water levels, and comprise lowest water level and satisfy the maximum stage of irrigating the fields and requiring, can be according to the concrete condition and the condition in testing irrigated area, take to change accordingly the water level method
E, testing channel usage factor:
When testing channel usage factor at different levels, only survey a water level, i.e. the ordinary water level of irrigating the fields in the past and discharging water, and require to treat to go again behind the stable level testing, and under the same water level of same section, survey three times continuously, at last three measured values are got its three mean values as calculated,
F, testing order:
1. survey benchmark " 0 " line depth of water h
0,
2. measure vertical line " 1 " start point distance L
1(being the level distance of datum line " 0 ") to survey line " 1 ", and survey vertical line " 1 " depth of water h
1, current meter is placed survey line " 1 " depth of water h
10.6 times locate (apart from the depth of water place of 0.6 times of the water surface) and carry out testing, treating that beginning numeration after the register sound is evenly pinches a stopwatch, and noting the sound equipment number of register and last number, surveyed for first, generally require a measuring point to revolve the survey time and be no less than 120 seconds,
3. every according to said sequence and method testing vertical line " 2 ", " 3 ", and in current meter stream-flow record, reckoner, note the testing value of each vertical line,
4. measure the start point distance L of vertical line " 4 "
4And depth of water h
4, and carry out record, so far, the same water level of this section respectively revolves the testing of survey vertical line measuring point and finishes,
5. change behind the channel water level according to said sequence and method carry out section second, third etc. the testing work of water level, minimumly to measure three different water levels, the testing work of a section is just finished,
G, testing section flow rate calculation:
1. according to the testing record, utilize the flow velocity computing formula of the used current meter of testing to calculate the flow velocity (being mean velocity in vertical) of each measuring point,
2. the calculating of part mean flow rate:
Two testing vertical line " 1 " and " 2 " in the middle of the testing section; The mean flow rate of " 2 " and " 3 " is the flow velocity of part between two vertical lines, and the part flow velocity that pulls in to shore in both sides is that testing vertical line " 1 " and " 3 " flow velocity of pulling in to shore multiply by a coefficient k, that is:
V
1p=V
1×k
V
2p=1/2(V
1+V
2)
V
3p=1/2(V
2+V
3)
V
4p=V
3×k
Coefficient k is different for its value of difform canal cross section, rectangular cross section: stone masonry antiseepage, k=0.8, concrete antiseepage, k=0.9; The coarse person of trapezoidal cross-section: Tu Qu and antiseepage, k=0.7, the concrete antiseepage, k=0.8,
3. the wide calculating of survey line part:
The start point distance that facility is surveyed vertical line " 0 ", " 1 ", " 2 ", " 3 ", " 4 " is L
0, L
1, L
2, L
3, L
4, the wide b of survey line part then
1=L
1-L
0, b
2=L
2-L
1, b
3=L
3-L
2, b
4=L
4-L
3,
4. the survey line part depth of water:
Rectangular cross section h
0, all=1/2 (h
0+ h
1)
h
1,2 is equal=1/2 (h
1+ h
2)
h
2,3 is equal=1/2 (h
2+ h
3)
h
3,4 is equal=1/2 (h
3+ h
4)
Trapezoidal cross-section
Bank both sides vertical line h
0=h
4=0
h
0,1 is equal=1/2 (0+h
1)
h
1,2 is equal=1/2 (h
1+ h
2)
h
2,3 is equal=1/2 (h
2+ h
3)
h
3,4 is equal=1/2 (h
3+ 0)
5. testing section part area:
Rectangle: f
1=h
0,1 is equal* b
1
f
2=h
1,2 is equal* b
2
f
3=h
2,3 is equal* b
3
f
4=h
3,4 is equal* b
4
Trapezoidal: f
1=1/2 (h
1* b
1)
f
2=h
1,2 is equal* b
2
f
3=h
2,3 is equal* b
3
f
4=1/2(h
3×b
4)
6. testing section part flow:
Q
1=f
1×V
1p
Q
2=f
2×V
2p
Q
3=f
3×V
3p
Q
4=f
4×V
4p
7. whole testing section flow:
Q
Disconnected=Q
1+ Q
2+ Q
3+ Q
4
8. whole basal area:
f
Disconnected=f
1+ f
2+ f
3+ f
4
9. mean velocity in section:
V
All disconnected=Q
Disconnected/ f
Disconnected
10. section mean depth:
h
All disconnected=(h
0,1 is equal+ h
1,2 is equal+ h
2,3 is equal+ h
3,4 is equal) ÷ 4
H, drafting water level--discharge relation curve map:
According to different water levels of the section that is calculated and flow, H on the rice ruled paper (water level)--point out corresponding point in Q (flow) coordinate system, three corresponding three flows of water level can be pointed out three joints, add zero point, plot curve with drawing curve with these 4, and this canal cross section figure also is drawn on H-Q curve map below
I, according to the H-Q curve map, by different water level value interpolation water levels--the discharge relation table of section, with the pairing flow value of the every rising 1cm of section water level all in table interpolation come out.
2, rating method according to claim 1 is characterized in that after the channel condition changes, be at any time with condition changing channel water-distributing gap testing section calibration again.
3, rating method according to claim 1, it is characterized in that to adopt the weir flow measurement for steeper small-sized channel, selected weir (Cipolletti weir, triangular-notch weir) should conform to the weir size in " water gaging method of field irrigation ", manufacture by its technical requirement, can use listed flowmeter in " method ", each weir of being made all will can use behind current-meter rating.
4, a kind of is the used flow measurement device of rating method of irrigated area water-distributing gap water gaging, it is characterized in that this method adopts current meter to measure the water-distributing gap cross-sectional flow, select large, medium and small three kinds of model current meters for use according to the size of channel flow velocity, large-scale metal cup-type current meter is applicable to that the canal cross section of big flow velocity tests the speed, small-sized plastics cup-type current meter is applicable to small-sized channel, the situation flow measurement of flow velocity below 0.5 meter per second.
5, according to claim 1 and 4 described rating methods and flow measurement device, it is characterized in that the calibration flow measurement will carry out on each channel water-distributing gap section of selected flow measurement, and at selected section sidewall 4 places cement trowel finish, white lacquer bottom, go out water gauge red and white 3 with red lacquer painting, water gauge 3 every compartments distances must not be greater than 2cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93121571 CN1110401A (en) | 1993-12-31 | 1993-12-31 | Water flow rating method and device for water-distributing gap in irrigation area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93121571 CN1110401A (en) | 1993-12-31 | 1993-12-31 | Water flow rating method and device for water-distributing gap in irrigation area |
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| Publication Number | Publication Date |
|---|---|
| CN1110401A true CN1110401A (en) | 1995-10-18 |
Family
ID=4993735
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|---|---|---|---|
| CN 93121571 Pending CN1110401A (en) | 1993-12-31 | 1993-12-31 | Water flow rating method and device for water-distributing gap in irrigation area |
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| CN104729605A (en) * | 2015-03-26 | 2015-06-24 | 宇星科技发展(深圳)有限公司 | Stream flow monitoring system and water-level flow calibration method thereof |
| CN105005707A (en) * | 2015-08-05 | 2015-10-28 | 武汉大学 | Method of determining stage-discharge relation in convergent area of main and branch waterways |
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| CN109839513A (en) * | 2019-02-28 | 2019-06-04 | 北京瞭望者科技有限责任公司 | Current velocity flow-measuring method, apparatus and system |
| CN111512911A (en) * | 2020-04-30 | 2020-08-11 | 浙江大学 | Water-saving irrigation method for field water layer control in rice growth period |
| CN113739879A (en) * | 2021-10-14 | 2021-12-03 | 四创科技有限公司 | Method and terminal for determining water measuring rate of open channel |
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| CN103017860A (en) * | 2012-12-28 | 2013-04-03 | 武汉大学 | Method and system for prewarning drought and flood disasters of farmlands |
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| CN103292873A (en) * | 2013-05-28 | 2013-09-11 | 广东省水利水电科学研究院 | Water taking metering and calibrating method |
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| CN105005707A (en) * | 2015-08-05 | 2015-10-28 | 武汉大学 | Method of determining stage-discharge relation in convergent area of main and branch waterways |
| CN108414028A (en) * | 2018-05-23 | 2018-08-17 | 湖南农业大学 | Weir hydraulic parameters measuring device |
| CN108414028B (en) * | 2018-05-23 | 2024-03-22 | 湖南农业大学 | Hydraulic parameter measuring device for water measuring weir |
| CN109839513A (en) * | 2019-02-28 | 2019-06-04 | 北京瞭望者科技有限责任公司 | Current velocity flow-measuring method, apparatus and system |
| CN111512911A (en) * | 2020-04-30 | 2020-08-11 | 浙江大学 | Water-saving irrigation method for field water layer control in rice growth period |
| CN113739879A (en) * | 2021-10-14 | 2021-12-03 | 四创科技有限公司 | Method and terminal for determining water measuring rate of open channel |
| CN113739879B (en) * | 2021-10-14 | 2024-03-26 | 四创科技有限公司 | Method and terminal for measuring water rate of open channel |
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