CN109991390A - A kind of frequency domain method field capacity measuring method - Google Patents
A kind of frequency domain method field capacity measuring method Download PDFInfo
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- CN109991390A CN109991390A CN201910269991.6A CN201910269991A CN109991390A CN 109991390 A CN109991390 A CN 109991390A CN 201910269991 A CN201910269991 A CN 201910269991A CN 109991390 A CN109991390 A CN 109991390A
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- 238000000034 method Methods 0.000 title claims abstract description 72
- 239000002689 soil Substances 0.000 claims abstract description 96
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000012544 monitoring process Methods 0.000 claims abstract description 45
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 238000007872 degassing Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims description 18
- 238000005553 drilling Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 241000208340 Araliaceae Species 0.000 claims description 5
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims description 5
- 235000003140 Panax quinquefolius Nutrition 0.000 claims description 5
- 235000008434 ginseng Nutrition 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 2
- 230000008595 infiltration Effects 0.000 claims description 2
- 238000001764 infiltration Methods 0.000 claims description 2
- 238000013508 migration Methods 0.000 abstract description 3
- 230000005012 migration Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 15
- 238000009434 installation Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000012407 engineering method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 244000018633 Prunus armeniaca Species 0.000 description 1
- 235000009827 Prunus armeniaca Nutrition 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940059082 douche Drugs 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- -1 loam Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
- G01N33/245—Earth materials for agricultural purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
- G01N33/246—Earth materials for water content
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Abstract
The present invention discloses a kind of frequency domain method field capacity measuring method, select power function catheter type soil moisture monitor, grouting degassing method installs instruments into tested soil, so that the monitoring accuracy of instrument is reached prescribed requirement by instrument parameter adjustment, the migration rule of moisture in the soil is organically combined with instrumental method soil moisture content technology.The appearance point that field capacity is had found on actual measurement soil moisture content graph, conveniently and efficiently determines the field capacity of the soil.Instrument need to be only installed in tested soil when use, adjusting parameter makes up to required precision, only need to be not required to manually do any intervention, can determine field capacity to filling the water in soil later, to realize that Soil Moisture Monitoring automates.
Description
Technical field
The present invention discloses a kind of frequency domain method field capacity measuring method, especially suitable for damage caused by a drought automatic monitoring system engineering
Construction and operation, belong to Monitoring of drought technical field.
Background technique
Modern research shows that no matter which kind of soil, soil subsides to moisture from receiving moisture, and aqueous discharge hydrograph all can
It shows ascent stage, tack section, the steep section that subsides, delay changeover portion, the several apparent features of variation of the slow section that subsides suddenly, wherein tack
Section, slow changeover portion is significant to measurement field capacity suddenly, and tack segment table shows that soil moisture content has arrived at saturation, Ke Yiting
Only filled the water to soil；Suddenly slow changeover portion illustrates that field capacity will occur.It is defined from field capacity it is found that in soil freely
At the time of water recession is soil irreducible water numerical value maximum at the time of end, soil moisture content at this time is field capacity,
This is theoretic result.In fact Free water and fetter waetr will not be separated absolutely in process of extinction and independently be carried out, so
It just will appear slow changeover portion suddenly rather than an apparent inflection point.So field capacity appears in steep slow changeover portion low side
First metastable moment.
Traditional field capacity measuring method only has artificial process, including indoor measurement method and field test method.Indoor survey
The method of determining includes core cutter method, pressure modulus method etc., and field test method includes cell douche, natural rainfall method etc..Artificial process measures field
Between water-holding capacity be affected by human factors seriously, measurement Personnel Skill Levels, working experience, professional dedication, authority etc. can shadows
Ring science, the accuracy for arriving measurement result；The whole process of artificial process measurement field capacity is artificially to change moisture
It is carried out under conditions of migration rule in the soil, this also affects the accuracy of measurement result；It holds in artificial process measurement field
It is more that water lasts length, great work intensity, required cost, and operation sequence is complicated, is extremely not suitable with the actual demand of Monitoring of drought work.
Summary of the invention
A kind of frequency domain method field capacity measuring method disclosed by the invention, purpose aim to solve the problem that existing artificial process measurement field
Between water-holding capacity precision it is low, last the problems such as long, intensity is big, expense is more, man's activity is serious, program is complicated.
A kind of frequency domain method field capacity measuring method of the present invention, comprising the following steps:
1) instrument type
Catheter type Soil Moisture Monitoring instrument with power function formula；
2) instrument formula
Formula form is power function: y=axb+c；Formula need to divide three-layer set, have long-range adjustment instrument parameter, adjustment monitoring frequency
Subfunction；
3) instrument is installed
Instrument is mounted in tested soil with grouting degassing method: first being punched with auger, then bores cutting drilling with cutting ring, brill
Soil out, which is put into basin, to be added water into mud and pours into drilling, and instrument is stained with after mud slowly insertion and is drilled, and is pulled out up and down
Instrument is inserted, to empty the air in drilling；Instrument installs and stablizes 1~2 day；
4) instrument monitoring accuracy test:
Manual sampling is carried out near instrument according to determining required precision, and drying calculates artificial process soil moisture content, and simultaneously
It carves instrument monitoring data to be compared, field capacity measurement can be carried out by meeting required precision, otherwise carry out parameter adjustment；
5) instrument parameter method of adjustment
Artificial process monitoring data and instrumental method monitoring data are substituted into instrument formula y=ax respectivelybIt is obtained after+c:
y=axb People+c1(1)
y=axb Instrument+c2(2)
In formula: y--- instrument dielectric parameter；xPeople--- artificial process soil moisture content；xInstrument--- instrumental method soil moisture content；A--- instrument
Device parameters of formula (constant)；B--- instrument parameters of formula (constant)；c1--- initial parameter；c2--- parameter on the spot；
(1) formula and (2) formula are subtracted each other, parameter c on the spot is obtained2:
c2 =axb People+c1- axb Instrument(3)
Its result is c2Parameter on the spot, by remotely adjusting ginseng function to reset instrument parameter；
New parameter c2After coming into force, then a manual sampling is carried out, the effect adjusted with inspection parameter；
6) it adjusts the instrument monitoring frequency: being adjusted to monitor for 20 minutes or 30 minutes by the instrument monitoring frequency by long-range frequency modulation function
Soil moisture content；
7) make cofferdam
Using instrument as the center of circle, 50cm or 60cm are that the radius base low bank of earth between fields makees cofferdam, and weir soil is treaded, and prevent moisture from exosmosing；
8) it is filled the water in weir
It is filled the water in weir, ground is in the water surface once always in weir, lower edge of the water surface no more than instrument seal cap；
Determine whether each layer soil moisture content reaches saturation: the stopping when three-layer soil water content, which rises, to be stopped and tack occur
Water filling, and water in weir is allowed to continue lower infiltration, until having seeped；
9) each layer water-retaining quantity among field of soil is determined
Each layer soil water-containing discharge hydrograph is observed, first stable point of steep slow changeover portion low side is that the soil field of this layer is held
Water appearance point, reading the corresponding soil moisture content of point is field capacity of the tested soil in this layer.
The present invention provides instrument type, new instrument formula form, instrument New Installation Method, the new sides of instrument parameter adjustment
Method, field capacity measure new method.Instrument type is catheter type soil moisture monitor；New instrument formula is power function,
That is: y=axb+c；Instrument New Installation Method is grouting degassing method；It is " some parameter distribution methods " that instrument parameter, which adjusts new method,；It holds in field
It is instrumental method that water, which measures new method,.Instrument is installed in tested soil, the monitoring essence of instrument is made by instrument parameter adjustment
Degree reaches prescribed requirement, after instrument surrounding does upper cofferdam, fills the water to tested soil, and aqueous discharge hydrograph is checked in marginal not waterside,
After there is tack, stop water filling, allows moisture is naturally lower to seep, until soil moisture content variation reaches stable state, to measure
Soil moisture content rising, steep drop, delays transition, stable variation overall process at tack suddenly, and field water holding is finally found on graph
Appearance point is measured, and then determines the field capacity of tested soil.
The positive effect of the present invention is:
The migration rule of moisture in the soil is organically combined with instrumental method soil moisture content technology.In actual measurement soil
The appearance point of field capacity is had found on aqueous discharge hydrograph, conveniently and efficiently determines the field capacity of the soil.Make
Instrument need to be only installed in tested soil by the used time, and adjusting parameter makes up to required precision, later only need to filling the water in soil,
It is not required to manually do any intervention, field capacity can be determined, to realize that Soil Moisture Monitoring automates.Positive effect of the invention
Fruit also resides in that operation history is short, need few personnel, less investment, measurement result precision is high, science is reliable, automates Soil Moisture Monitoring
It comes true.Compared with prior art, technical solution of the present invention structure is simple, and each parameter acquiring unit is placed in tube body,
The acquisition of multi-parameter can be carried out by once mounting, and avoid excessive mechanical connection, and then junction is avoided to go out
Existing problem；Energy while since whole structure is simple, and being protected to building block by tube body, and then reduce failure rate
Enough various demands met using ground.
Detailed description of the invention
Fig. 1 is side structure schematic view of the present invention；
In Fig. 1: 1 monitoring instrument, 2 ground, 3 cofferdam, the water surface, 5 tested soil layers in 4 weirs；
Fig. 2 is the aqueous discharge hydrograph schematic diagram that the present invention measures；
In Fig. 2: ordinate is soil moisture content (%), abscissa is the time (h), tri- lines of Lan Huanghong are respectively 10,20,40 lis
The soil water-containing discharge hydrograph of rice soil depth.
Specific embodiment:
Following embodiment is a specific embodiment of the invention, it will be appreciated by those of skill in the art that this is only to lift
Example explanation, protection scope of the present invention are defined by the appended claims, and those skilled in the art is without departing substantially from this hair
Under the premise of bright principle and essence, many changes and modifications may be made, these change and modification are equal
Fall into protection scope of the present invention.
Embodiment
1, instrument type selecting: selection catheter type soil moisture monitor device (SSXT-SQ-02)；Instrument working principle: dielectric method
One kind --- frequency domain method (FDR)；Change this with the variation of soil moisture content according to dielectric parameter apparent in tested soil
Principle measures soil moisture content；Functional relation between instrument dielectric parameter and soil moisture content (volumetric(al) moisture content) is power letter
Number, it may be assumed that y=axb+c；
2, instrument formula: formula form is power function: y=axb+c；Formula need to divide three-layer set, have long-range adjustment instrument ginseng
Number, adjustment Monitoring frequency function；
3, instrument is installed: instrument is mounted in tested soil with grouting degassing method, specific method is first to be punched with auger,
Cutting drilling is bored with cutting ring again, the soil drilled out is put into basin and adds water into mud and pours into drilling, instrument is stained with mud
Slowly insertion drilling afterwards, and plug instrument up and down, to empty the air in drilling；Instrument installs and stablizes 1~2 day；
4, instrument monitoring accuracy test: the monitoring accuracy of employment engineering method testing instruments.According to pre-determined required precision, in instrument
Device nearby carries out manual sampling, and drying calculates artificial process soil moisture content, is compared with instrument monitoring data in the same time, meets
Required precision can carry out field capacity measurement, otherwise carry out parameter adjustment.
5, instrument parameter adjusts: when instrument monitoring precision backlog demand, i.e. progress parameter adjustment, using " some tune
Ginseng method " adjusts instrument parameter, is allowed to monitoring accuracy and meets the requirements；
Specific method is: artificial process monitoring data and instrumental method monitoring data are substituted into instrument formula y=ax respectivelybIt is obtained after+c:
y=axb People+c1(1)
y=axb Instrument+c2(2)
In formula: y--- instrument dielectric parameter；
xPeople--- artificial process soil moisture content；
xInstrument--- instrumental method soil moisture content；
A--- instrument parameters of formula (constant)
B--- instrument parameters of formula (constant)；
c1--- initial parameter；
c2--- parameter on the spot；
(1) formula and (2) formula are subtracted each other, parameter c on the spot is obtained2:
c2 =axb People+c1- axb Instrument(3)
Its result is c2Parameter on the spot, by remotely adjusting ginseng function to reset instrument parameter；New parameter c2It comes into force
Afterwards, then a manual sampling is carried out, with the effect of inspection parameter adjustment；
6, it adjusts the instrument monitoring frequency: being adjusted to monitor for 20 minutes or 30 minutes by the instrument monitoring frequency by long-range frequency modulation function
Soil moisture content；
7, making cofferdam, (the selection soil texture is respectively the representative station of sandy soil, loam, clay, they are after Songyuan City is regional respectively
Woods family's defensive wall station, thousand liang of villages station in Liaoyuan area, apricot Kimura station): as shown in Figure 1 using instrument as the center of circle, 50cm or 60cm are half
Diameter builds the low bank of earth between fields and makees cofferdam, and weir soil is treaded, and prevents moisture from exosmosing；
8, fill the water into weir: such as Fig. 1, the goods that draws water manually is fetched water to fill the water into the earth bank performed, and ground in weir is kept to locate always
Once in the water surface, pay attention to lower edge of the water surface no more than instrument seal cap；
It determines whether each layer soil moisture content reaches saturation: monitoring the variation of soil water-containing discharge hydrograph by information platform, when
Three-layer soil water content, which rises to, stops water filling when no longer rising and occur tack after certain altitude, and allows in weir under water continues
It seeps, until having seeped；
9, it determines each layer water-retaining quantity among field of soil: such as Fig. 2, observing each layer soil water-containing discharge hydrograph in information terminal, delayed suddenly
First stable point for crossing section low side is the water-retaining quantity among field of soil appearance point of this layer, reads the corresponding soil moisture content of point
In the field capacity of this layer, (monitoring data at three soil moisture content stations see the table below 1 to as tested soil, and with pedestal method artificial process
The monitoring data of monitoring data testing instruments method, the results showed that, the testing result of instrumental method is accurate, stablizes, is reliable).
The 1. distinct methods Soil Water Content Monitoring table of comparisons of table
It is power function that catheter type Soil Moisture Monitoring instrument, which is formula form, can carry out parameter adjustment (and the instrument of other formula forms
Can not carry out parameter adjustment), the data precision of instrument monitoring can be made to reach production requirement；Catheter type Soil Moisture Monitoring instrument installation when
Do not destroy soil texture；
Instrument installation method is grouting degassing method, can eliminate the air interlayer between instrument and soil, tie instrument closely with soil
It closes, is one of the effective way for improving instrument monitoring precision；
Instrument monitoring inspection method of accuracy is comparative observation method, and instrument should be monitored the inspection of precision after being installed, and is monitored
Precision can just carry out the measurement of field capacity after meeting the requirements, otherwise not can enter the measurement of field capacity.Comparative observation
Method is exactly employment engineering method and instrumental method while the measurement for carrying out soil moisture content, then carries out data comparison, and error is met the requirements
It is as qualified, otherwise carry out instrument parameter adjustment；Instrument parameter method of adjustment is " some parameter distribution methods ", adjustment instrument parameter and soil
Earth water content size is unrelated, convenient and efficient, time saving and energy saving, and job costs are low.
Claims (1)
1. a kind of frequency domain method field capacity measuring method, it is characterised in that the following steps are included:
1) instrument type
Catheter type Soil Moisture Monitoring instrument with power function formula；
2) instrument formula
Formula form is power function: y=axb+c；Formula need to divide three-layer set, have long-range adjustment instrument parameter, adjustment monitoring frequency
Subfunction；
3) instrument is installed
Instrument is mounted in tested soil with grouting degassing method: first being punched with auger, then bores cutting drilling with cutting ring, brill
Soil out, which is put into basin, to be added water into mud and pours into drilling, and instrument is stained with after mud slowly insertion and is drilled, and is pulled out up and down
Instrument is inserted, to empty the air in drilling；Instrument installs and stablizes 1 ~ 2 day；
4) instrument monitoring accuracy test:
Manual sampling is carried out near instrument according to determining required precision, and drying calculates artificial process soil moisture content, and simultaneously
It carves instrument monitoring data to be compared, field capacity measurement can be carried out by meeting required precision, otherwise carry out parameter adjustment；
5) instrument parameter method of adjustment
Artificial process monitoring data and instrumental method monitoring data are substituted into instrument formula y=ax respectivelybIt is obtained after+c:
y=axb People+c1(1)
y=axb Instrument+c2(2)
In formula: y--- instrument dielectric parameter；xPeople--- artificial process soil moisture content；xInstrument--- instrumental method soil moisture content；A--- instrument
Device parameters of formula (constant)；B--- instrument parameters of formula (constant)；c1--- initial parameter；c2--- parameter on the spot；
(1) formula and (2) formula are subtracted each other, parameter c on the spot is obtained2:
c2 =axb People+c1- axb Instrument(3)
Its result is c2Parameter on the spot, by remotely adjusting ginseng function to reset instrument parameter；
New parameter c2After coming into force, then a manual sampling is carried out, the effect adjusted with inspection parameter；
6) it adjusts the instrument monitoring frequency: being adjusted to monitor for 20 minutes or 30 minutes by the instrument monitoring frequency by long-range frequency modulation function
Soil moisture content；
7) make cofferdam
Using instrument as the center of circle, 50cm or 60cm are that the radius base low bank of earth between fields makees cofferdam, and weir soil is treaded, and prevent moisture from exosmosing；
8) it is filled the water in weir
It is filled the water in weir, ground is in the water surface once always in weir, lower edge of the water surface no more than instrument seal cap；
Determine whether each layer soil moisture content reaches saturation: the stopping when three-layer soil water content, which rises, to be stopped and tack occur
Water filling, and water in weir is allowed to continue lower infiltration, until having seeped；
9) each layer water-retaining quantity among field of soil is determined
Each layer soil water-containing discharge hydrograph is observed, first stable point of steep slow changeover portion low side is that the soil field of this layer is held
Water appearance point, reading the corresponding soil moisture content of point is field capacity of the tested soil in this layer.
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| CN201910269991.6A CN109991390A (en) | 2019-04-04 | 2019-04-04 | A kind of frequency domain method field capacity measuring method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110208497A (en) * | 2019-07-17 | 2019-09-06 | 吉林大学 | A kind of portable soil specific yield tester and test method |
| CN110208498A (en) * | 2019-07-17 | 2019-09-06 | 吉林大学 | A kind of soil specific yield home position testing method based on moisture Dynamic Mechanism |
| CN110320345A (en) * | 2019-07-17 | 2019-10-11 | 吉林大学 | A kind of portable field capacity auto testing instrument and test method |
| CN110763821A (en) * | 2019-09-20 | 2020-02-07 | 河南锐利特计算机科技有限公司 | Method and device for measuring water-holding capacity of field |
| CN113030431A (en) * | 2021-02-23 | 2021-06-25 | 北京农业智能装备技术研究中心 | Method and system for measuring water capacity of soil in field |
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| CN1979162A (en) * | 2005-11-30 | 2007-06-13 | 中国农业大学 | Method and apparatus for detecting water-retaining quantity among field of soil |
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| CN206161464U (en) * | 2016-11-15 | 2017-05-10 | 贵州大学 | Different particle diameter field water -holding capacity's of indoor survey device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208497A (en) * | 2019-07-17 | 2019-09-06 | 吉林大学 | A kind of portable soil specific yield tester and test method |
| CN110208498A (en) * | 2019-07-17 | 2019-09-06 | 吉林大学 | A kind of soil specific yield home position testing method based on moisture Dynamic Mechanism |
| CN110320345A (en) * | 2019-07-17 | 2019-10-11 | 吉林大学 | A kind of portable field capacity auto testing instrument and test method |
| CN110763821A (en) * | 2019-09-20 | 2020-02-07 | 河南锐利特计算机科技有限公司 | Method and device for measuring water-holding capacity of field |
| CN113030431A (en) * | 2021-02-23 | 2021-06-25 | 北京农业智能装备技术研究中心 | Method and system for measuring water capacity of soil in field |
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