CN104359801A - Multi-stage aeration zone soil moisture diffusion tester based on one-dimensional horizontal flow - Google Patents
Multi-stage aeration zone soil moisture diffusion tester based on one-dimensional horizontal flow Download PDFInfo
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Abstract
The invention relates to a multi-stage aeration zone moisture diffusion tester based on one-dimensional horizontal flow. The tester comprises a water supply device, a water flow buffer device, a multi-stage experimental section and a moisture measurement device. According to the multi-stage aeration zone soil moisture diffusion tester based on one-dimensional horizontal flow, a plurality of soil column unit tubes are connected together by connecting pipes, so that a semi-infinite boundary needed by aeration zone moisture diffusion measurement and the multi-stage experimental section filled with uniform-texture soil can be formed. For the multi-stage aeration zone soil moisture diffusion tester, soil columns can be lengthened according to the property of a soil sample, so as to meet the semi-infinite length boundary definite condition of the aeration zone soil moisture diffusion measurement equation. According to the multi-stage aeration zone soil moisture diffusion tester, the structure of the multiple soil column unit tubes is adopted, so that the filling of the soil sample is convenient, the assumption condition of uniform soil texture of the aeration zone soil moisture diffusion measurement equation can be met, and the influence of the boundary effect on the test result can be eliminated. The tester is simple in structure, convenient to use and small in error, and can be used for measuring the aeration zone moisture diffusion, thus providing study parameters for soil improvement and migration of pollutant in the aeration zone soil.
Description
Technical field
The present invention relates to a kind of determinator of Soil moisture of vadose zone diffusibleness, specifically relate to a kind of multisection type Soil moisture of vadose zone diffusibleness analyzer based on One-Dimensional Water advection.
Background technology
China is large agricultural country, how to keep the sustainable development of agricultural, improve the effective rate of utilization of water resource, guarantee that water and soil and the balance between water and environment are problem demanding prompt solutions, therefore, research Soil Moisture Movement characteristic and parameter are the key factors of agricultural sustainable development.Unsaturated soil waterpower diffusibleness, is again diffusivity or coefficient of diffusion, is to evaluate unsaturated soil moisture motion-individual important indicator.For the research such as research, Soil Water prediction, the regional water salt characteristics of motion of surface water one holard-groundwater, unsaturated soil waterpower diffusibleness is a requisite parameter, and the size of its value has larger impact for result of calculation; It is the mathematical model using Soil Moisture Dynamics ultimate principle to set up soil water movement, simulates that the one-dimensional space of soil moisture content under different rainfall or irrigation intensity distributes, infiltrates, requisite important parameter in runoff process and runoff yield total amount and the process study of the moisture movement such as solute motion, contaminant transportation.
At present, Soil moisture of vadose zone diffusibleness many employings horizontal soil column method measures, and the situation namely according to soil moisture occurred level motion in longer (horizontal semiinfinite border) homogeneous soil carries out analytical calculation; Also have disclosed in employing China in 2008, the patent No. is " a kind of circular disc type nonsaturated soil moisture diffusion instrument " of 200810018025.9.Above-mentioned horizontal soil column method and disc type moisture diffusion instrument, the horizontal soil column method that both all use Bruse and Klute (1956) to propose, namely a semi-infinite long horizontal soil column sorptivety experiment is utilized, ignore Action of Gravity Field, according to partial differential equation and the definite condition of one dimension horizontal flow, after introducing Bohzmann conversion, partial differential equation is converted into ordinary differential equation, computing formula is tried to achieve by analytical method, then by experimental data list calculated value.
But above-mentioned traditional horizontal soil column and circular disc type nonsaturated soil moisture diffusion instrument all cannot meet the definite condition of the differential equation and the assumed conditions of equation simultaneously, namely horizontal soil column is semi-infinite long, and soil texture density is homogeneous.Will meet above-mentioned two conditions simultaneously, need earth pillar diameter much smaller than earth pillar length, and the small bore tube for loading earth pillar also needs to be convenient to the homogeneous filling of soil sample.But earth pillar diameter is too little, stronger wall effect can be caused, one dimension horizontal flow cannot be considered as; And if for not considering wall effect earth pillar diameter, required earth pillar length then can be very long, on the one hand by the restriction of earth pillar production technology, earth pillar diameter cannot infinitely lengthen, after another aspect earth pillar is elongated, dress quadrat method traditionally, the every 3cm soil sample of general employing carries out hand compaction method, this just causes a very long earth pillar to be carried out to dress sample firmly uneven, thus makes soil texture density unevenness one.The test section length of described circular disc type nonsaturated soil moisture diffusion instrument is 45cm, and the thickness of sample section is 12cm, obviously cannot meet the definite condition of equation, i.e. earth pillar semi-infinite long.For above-mentioned reasons, forefathers all cannot meet definite condition and the assumed conditions of the equation of institute's foundation, so the Soil moisture of vadose zone diffusibleness recorded has comparatively big error about the determinator of Soil moisture of vadose zone diffusibleness.
Summary of the invention
The object of the invention is for solving prior art Problems existing, and a kind of multisection type Soil moisture of vadose zone diffusibleness analyzer based on One-Dimensional Water advection is provided, and analyzer had both been convenient to the homogeneous filling of soil sample in earth pillar, the length of earth pillar can be lengthened according to the character of soil sample simultaneously, and the impact of wall effect on test result can be got rid of, namely definite condition and the assumed conditions of the Soil moisture of vadose zone diffusibleness differential equation can be met, thus can Accurate Determining Soil moisture of vadose zone diffusibleness.
To achieve these goals, the technical solution adopted in the present invention is: provide a kind of multisection type Soil moisture of vadose zone diffusibleness analyzer based on One-Dimensional Water advection, comprise water supply installation, water flow buffer device, multisection type experimental section and device for measuring moisture; Described water supply installation is provided with geneva bottle, water tank and operation valve A, operation valve B, and geneva bottle top is inserted with draft tube by rubber stopper, and geneva bottle bottom sets out the mouth of a river and is connected with geneva bottle rising pipe, and geneva bottle rising pipe is equipped with operation valve B; Water tank is installed on the position higher than hydroecium section, and water outlet of water tank is connected with radiator drain, radiator drain is equipped with operation valve A, and geneva bottle rising pipe and radiator drain one end are inserted in the rubber stopper of hydroecium section front end respectively; Water tank is used for providing the quantitative water yield to hydroecium section, to ensure that the water yield in geneva bottle is all in order to carry out the horizontal infiltration of earth pillar;
Described water flow buffer device is provided with hydroecium section and filtering layer section, adopts two sections of isometrical, two ends to be provided with the outer tube of externally threaded pipe as hydroecium section and filtering layer section, is connected between two sections of pipes by the female connecting pipe of supporting band; Be provided with perforated plate at filtering layer section two ends, be respectively used to the hydroecium section of filtering layer section and front end, the earth pillar unit pipes of rear end separates, perforated plate, being stained with fine and close gauze inside filtering layer section two ends, is filled with silica sand in filtering layer section;
Described multisection type experimental section is provided with earth pillar unit pipes, connecting pipe, outer silk pagoda joint, fixed cap and bearing; Multisection type experimental section is formed by connecting by connecting pipe by multiple earth pillar unit pipes, respectively mounting hole is drilled with apart from pipe two ends 1/4th place in each earth pillar unit pipes, outer silk pagoda joint is housed in mounting hole, fixed cap is spun on outer silk pagoda joint by screw thread, and fixed cap, outer silk pagoda joint are used for fixing moisture transducer; Under each earth pillar unit pipes, be provided with the bearing matched with earth pillar unit pipes, bearing upper end is used for fixing, to support earth pillar unit pipes and elimination gravity potential impact with circular arc; Earth pillar unit pipes is for loading the soil of experiment;
Described device for measuring moisture is made up of soil moisture sensor, data acquisition line concentration and data handling system, is provided with two soil moisture sensors in each earth pillar unit pipes, and soil moisture sensor is connected with data handling system by data acquisition line concentration.
Described draft tube is inserted in geneva bottle, draft tube lower end extends the central horizontal position of geneva bottle bottom water delivering orifice, make draft tube lower end, the water inlet of geneva bottle water delivering orifice and hydroecium section keeps same level height, in order to eliminate the impact that pressure potential spreads soil moisture.
The earth pillar unit pipes of pipe and multisection type experimental section that described hydroecium section, filtering layer section adopt is isometrical, two ends and is provided with externally threaded pipe, all by being with the connection of female connecting pipe.
The earth pillar unit pipes of described multisection type experimental section is several to be increased flexibly according to soil property and requirement of experiment, to meet the semiinfinite boundary condition required for Soil moisture of vadose zone diffusion measurement horizontal soil column method.
Described each earth pillar unit pipes adopts plexi-glass tubular to make, each organic glass length of tube 18 ~ 24cm, to avoid the oversize earth pillar that makes of earth pillar unit pipes to fill sample heterogeneity, and ensure earth pillar initial aqueous rate and quality homogeneous.
The earth pillar unit pipes of described multisection type experimental section fills native process and is: sample soil is through air-dry, levigate and sieved by the screen cloth of aperture 2mm, and sample soil layering loads compacting, every layer thickness 3cm, and for keeping each layer to contact closely, interlayer does ball woll process; After having loaded first earth pillar unit pipes, connect another earth pillar unit pipes with connecting pipe, continue filling step above, load multiple earth pillar unit pipes composition multisection type experimental section successively.
Described water supply process is first open the operation valve A be connected with water tank, supplies water to hydroecium section, when hydroecium section is full of water, filtering layer section part satisfy water time closed control valve A, then open the operation valve B be connected with geneva bottle.
The principle of work of the multisection type Soil moisture of vadose zone diffusibleness analyzer based on One-Dimensional Water advection of the present invention is as follows:
This analyzer adopts horizontal soil column method to measure unsaturated soil moisture diffusibleness, the soil texture density of earth pillar is homogeneous on request, initial aqueous rate is identical, earth pillar water inlet end constant level, pressure are zero, i.e. the major impetus of moisture horizontal sorptivety motion in earth pillar is soil matrix suction.Because the diameter of earth pillar pipe is less, therefore ignore Action of Gravity Field, be considered as one dimension horizontal flow.Multiple earth pillar unit pipes is coupled together by connecting pipe by this analyzer, formed meet Soil moisture of vadose zone diffusibleness measure needed for meet semiinfinite border and can load homogeneous quality soil multisection type experimental section.Its differential equation and definite condition are:
In formula: θ-for being the soil moisture content at x place apart from the distance of earth pillar initial end (water inlet border), cm
3/ cm
3;
T-be experimental period, min;
X-be apart from the distance of earth pillar initial end, cm;
D (θ)-be soil moisture diffusibleness, cm
2/ min;
θ
a-be soil initial aqueous rate, cm
3/ cm
3;
θ
b-be top soil moisture content (saturated aqueous rate), cm
3/ cm
3.
Equation (1) is nonlinear partial differential equation, adopts Boltzmann conversion, converts it into ordi-nary differential equation solving, can obtain the computing formula of D (θ):
In formula: D (θ)-be soil moisture diffusibleness, cm
2/ min;
θ-for being the soil moisture content at x place apart from the distance of earth pillar initial end (water inlet border), cm
3/ cm
3;
λ-for Boltzmann conversion parameter, λ=xt
-1/2, cm/min
1/2;
θ
a-be soil initial aqueous rate, cm
3/ cm
3.
T-be experimental period, min;
X-for section is apart from the distance at top, cm;
During experiment, measure the water percentage of earth pillar in t, and calculate the λ value of each x point, just can draw out the empirical curve of θ-λ relation.By this curve, can obtain the corresponding d θ/d λ value of different θ value and
value, substitutes into formula (2) them, just can calculate D (θ).
Soil moisture diffusibleness analyzer of the present invention compared with prior art has following advantage:
(1), soil moisture diffusibleness analyzer of the present invention can lengthen the length of earth pillar, to meet the semi-infinite long border definite condition that Soil moisture of vadose zone diffusibleness measures equation according to the character of soil sample.
(2), each length 18 ~ 24cm of multisection type experimental section earth pillar unit pipes in analyzer of the present invention, facilitate the filling of soil sample, Soil moisture of vadose zone diffusibleness can be met and measure the homogeneous assumed conditions of the equation soil texture, and eliminate the impact of wall effect on test result.
(3), analyzer structure of the present invention is simple, easy to use, is with a wide range of applications.As being widely used in aeration zone hydrologic research, contribute to as instruments used for education principle and the scope of application thereof that student better understands Soil moisture of vadose zone diffusibleness mensuration; And can be used for measuring the moisture diffusion degree of aerated zone soil aborning, for farmland soil modifying provides research parameter, also can measure the moisture diffusion degree of contaminated soil, for pollutant provides research parameter in the migration of aerated zone soil.
Accompanying drawing explanation
Fig. 1 is a kind of soil moisture diffusibleness analyzer one-piece construction schematic diagram of the present invention.
Fig. 2 is the structural representation of earth pillar unit pipes of the present invention and connecting pipe.
Fig. 3 is the schematic side view of bearing in the present invention and earth pillar unit pipes.
In above-mentioned figure: 1-draft tube, 2-geneva bottle, 3-rubber stopper, 4-operation valve A, 5-water tank, 6-hydroecium section, 7-gauze, 8-perforated plate, 9-filtering layer section, 10-silica sand, 11-earth pillar unit pipes, 12-soil moisture sensor, 13-data acquisition line concentration, 14-bearing, 15-data handling system, 16-operation valve B, 17-connecting pipe, 18-internal thread, 19-external thread, 20-mounting hole, 21-fixed cap, the outer silk pagoda joint of 22-.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated, but enforcement of the present invention is not limited thereto.
Embodiment 1: a kind of multisection type Soil moisture of vadose zone diffusibleness analyzer based on One-Dimensional Water advection provided by the invention, its structure as shown in Figure 1.Comprise water supply installation, water flow buffer device, multisection type experimental section and device for measuring moisture; Described water supply installation is provided with geneva bottle 2, water tank 5 and operation valve A4, operation valve B16, and geneva bottle top is inserted with draft tube 1 by rubber stopper, and geneva bottle bottom sets out the mouth of a river and is connected with geneva bottle rising pipe, and geneva bottle rising pipe is equipped with operation valve B16; Water tank is installed on the position higher than hydroecium section 6, and water outlet of water tank is connected with radiator drain, radiator drain is equipped with operation valve A4, and geneva bottle rising pipe and radiator drain are inserted in the rubber stopper 3 of hydroecium section front end respectively; Water tank 5 for providing the quantitative water yield to hydroecium section 6, to ensure that the water yield in geneva bottle 2 is all in order to carry out the horizontal infiltration of earth pillar; Described draft tube adopts glass tube, the draft tube lower end be inserted in geneva bottle extends the central horizontal position of geneva bottle bottom water delivering orifice, make draft tube lower end, the water inlet of geneva bottle water delivering orifice and hydroecium section keeps same level height, in order to eliminate the impact that pressure potential spreads soil moisture.
Described water flow buffer device is provided with hydroecium section 6 and filtering layer section 9, adopt two sections of isometrical, that two ends are provided with external thread 19 pipes as the outer tube of hydroecium section 6 and filtering layer section 9 in the present invention, two sections of pipes all adopt that length is 10cm, the plexi-glass tubular of diameter 5cm makes, see Fig. 2, connected by the supporting connecting pipe 17 with internal thread 18 between two sections of pipes; Connecting pipe is the plexi-glass tubular of long 4cm.Perforated plate 8 is provided with at filtering layer section 9 two ends, perforated plate is respectively used to separate with the hydroecium section 6 of front end, the earth pillar unit pipes 11 of rear end, perforated plate 8 is also processed with organic glass, perforated plate 8 chloroform is connected to filtering layer section 9 two ends, perforated plate, being stained with fine and close gauze 7 inside filtering layer section 9, is filled with silica sand 10 in filtering layer section;
Described multisection type experimental section is provided with earth pillar unit pipes 11, connecting pipe 17, outer silk pagoda 22, fixed cap 21 and bearing 14; Multisection type experimental section is formed by connecting by connecting pipe by multiple earth pillar unit pipes, each earth pillar unit pipes adopts plexi-glass tubular to make, length 20cm, can avoid the oversize earth pillar that makes of earth pillar unit pipes to fill sample heterogeneity like this, and ensure earth pillar initial aqueous rate and quality homogeneous.See Fig. 2,3, mounting hole 20 is respectively drilled with apart from pipe two ends 1/4th place in each earth pillar unit pipes, outer silk pagoda joint 22 is housed in mounting hole, the outer silk pagoda joint of the present embodiment adopts copper outer silk pagoda joint, fixed cap 21 is spun on outer silk pagoda joint by screw thread, and fixed cap, outer silk pagoda joint are used for fixing moisture transducer 12; Under each earth pillar unit pipes, be provided with the bearing matched with earth pillar unit pipes, bearing upper end is used for fixing, to support earth pillar unit pipes and elimination gravity potential impact with circular arc; Earth pillar unit pipes is for loading the soil of experiment.
The pipe that described hydroecium section 6, filtering layer section 9 adopt and the earth pillar unit pipes of multisection type experimental section are isometrical, that two ends are provided with external thread 19 pipe, are all connected by the connecting pipe 17 with internal thread 18.The earth pillar unit pipes number of multisection type experimental section can increase flexibly according to soil property and requirement of experiment, for meeting the semiinfinite boundary condition of Soil moisture of vadose zone diffusion measurement horizontal soil column method.
Described device for measuring moisture is made up of soil moisture sensor 12, data acquisition line concentration 13 and data handling system 15, two soil moisture sensors are installed in each earth pillar unit pipes 11, be arranged on apart from 5cm place, pipe two ends respectively, soil moisture sensor 12 is connected with data handling system 15 by data acquisition line concentration 13, and data handling system adopts TDR soil water content data handling system.
Use soil moisture diffusibleness analyzer of the present invention, the quantitative water yield must be provided by assure feed water case 5 to hydroecium section 6, to ensure that the water yield in geneva bottle 2 is all used for carrying out the horizontal infiltration of earth pillar, otherwise the water yield in experimentation in geneva bottle is not enough, the deviation of test findings finally can be caused.Water supply process is first open the operation valve A4 be connected with water tank 5, supplies water to hydroecium section 6, when hydroecium section is full of water, filtering layer section 9 part satisfy water time closed control valve A4, then open the operation valve B16 be connected with geneva bottle.
The job step of a kind of lengthening multisection type Soil moisture of vadose zone diffusibleness analyzer based on One-Dimensional Water advection provided by the invention is as follows:
1., sample soil is loaded
Sample soil is through air-dry, levigate and sieve (aperture 2mm), and sample soil layering loads compacting, every layer thickness about 3cm, and for keeping each layer to contact closely, interlayer does ball woll process.After installing first earth pillar unit pipes, connect another earth pillar unit pipes with connecting pipe, continue filling step above, fill multiple earth pillar unit pipes composition multisection type experimental section successively, ensure earth pillar initial aqueous rate and quality homogeneous.
2., analyzer is installed
Hydroecium section 6, filtering layer section 9 and multisection type experimental section connecting pipe connect after loading by sample.Lay geneva bottle 2, in order to realize water supply with no pressure, when laying geneva bottle, on geneva bottle, bottleneck must cover rubber stopper, draft tube 1 inserted in geneva bottle, the lower end of draft tube, geneva bottle water delivering orifice and hydroecium section water inlet, in same level height, are that zero head supplies water during to ensure experiment.
3., supply water to hydroecium section
Open the operation valve A4 be connected with water tank 5, supply water to hydroecium section 6, when hydroecium section is full of water, filtering layer section 9 satisfy water time closed control valve A4, open the operation valve B16 be connected with geneva bottle, start the time t that the experiment of stopwatch record starts simultaneously
0.
4., observe, record test figure
When soil wetting front in multisection type experimental section arrives 2/3 of whole earth pillar, closed control valve B16, end of record (EOR) time t
n, utilize device for measuring moisture to measure earth pillar along journey x
i(i=1,2,3 ..., 10) and sample water percentage θ
idistribution.(1) the moisture diffusion degree of aerated zone soil, is (2) calculated by aforementioned computing formula.
Analyzer structure of the present invention is simple, easy to use, is with a wide range of applications.As being widely used in aeration zone hydrologic research, contribute to as instruments used for education principle and its scope of application that student better understands Soil moisture of vadose zone diffusibleness mensuration; And can be used to the moisture diffusion degree measuring aerated zone soil aborning, for research farmland soil modifying provides parameter, also can be used for the moisture diffusion degree measuring contaminated soil, for research pollutant provides parameter in the migration of aerated zone soil.
Claims (7)
1., based on a multisection type Soil moisture of vadose zone diffusibleness analyzer for One-Dimensional Water advection, comprise water supply installation, water flow buffer device, multisection type experimental section and device for measuring moisture; It is characterized in that: described water supply installation is provided with geneva bottle, water tank and operation valve A, operation valve B, geneva bottle top is inserted with draft tube by rubber stopper, and geneva bottle bottom sets out the mouth of a river and is connected with geneva bottle rising pipe, and geneva bottle rising pipe is equipped with operation valve B; Water tank is installed on the position higher than hydroecium section, and water outlet of water tank is connected with radiator drain, radiator drain is equipped with operation valve A, and geneva bottle rising pipe and radiator drain one end are inserted in the rubber stopper of hydroecium section front end respectively; Water tank is used for providing the quantitative water yield to hydroecium section, to ensure that the water yield in geneva bottle is all in order to carry out the horizontal infiltration of earth pillar;
Described water flow buffer device is provided with hydroecium section and filtering layer section, adopts two sections of isometrical, two ends to be provided with the outer tube of externally threaded pipe as hydroecium section and filtering layer section, is connected between two sections of pipes by the female connecting pipe of supporting band; Be provided with perforated plate at filtering layer section two ends, be respectively used to the hydroecium section of filtering layer section and front end, the earth pillar unit pipes of rear end separates, perforated plate, being stained with fine and close gauze inside filtering layer section two ends, is filled with silica sand in filtering layer section;
Described multisection type experimental section is provided with earth pillar unit pipes, connecting pipe, outer silk pagoda joint, fixed cap and bearing; Multisection type experimental section is formed by connecting by connecting pipe by multiple earth pillar unit pipes, respectively mounting hole is drilled with apart from pipe two ends 1/4th place in each earth pillar unit pipes, outer silk pagoda joint is housed in mounting hole, fixed cap is spun on outer silk pagoda joint by screw thread, and fixed cap, outer silk pagoda joint are used for fixing moisture transducer; Under each earth pillar unit pipes, be provided with the bearing matched with earth pillar unit pipes, bearing upper end is used for fixing, to support earth pillar unit pipes and elimination gravity potential impact with circular arc; Earth pillar unit pipes is for loading the soil of experiment;
Described device for measuring moisture is made up of soil moisture sensor, data acquisition line concentration and data handling system, is provided with two soil moisture sensors in each earth pillar unit pipes, and soil moisture sensor is connected with data handling system by data acquisition line concentration.
2. the multisection type Soil moisture of vadose zone diffusibleness analyzer based on One-Dimensional Water advection according to claim 1, it is characterized in that: described draft tube is inserted in geneva bottle, draft tube lower end extends the central horizontal position of geneva bottle bottom water delivering orifice, make draft tube lower end, the water inlet of geneva bottle water delivering orifice and hydroecium section keeps same level height, in order to eliminate the impact that pressure potential spreads soil moisture.
3. the multisection type Soil moisture of vadose zone diffusibleness analyzer based on One-Dimensional Water advection according to claim 1, it is characterized in that: the earth pillar unit pipes of pipe and multisection type experimental section that described hydroecium section, filtering layer section adopt is isometrical, two ends and is provided with externally threaded pipe, all by being with the connection of female connecting pipe.
4. the multisection type Soil moisture of vadose zone diffusibleness analyzer based on One-Dimensional Water advection according to claim 1, it is characterized in that: the earth pillar unit pipes of described multisection type experimental section is several to be increased flexibly according to soil property and requirement of experiment, to meet the semiinfinite boundary condition required for Soil moisture of vadose zone diffusion measurement horizontal soil column method.
5. the multisection type Soil moisture of vadose zone diffusibleness analyzer based on One-Dimensional Water advection according to claim 1, it is characterized in that: described each earth pillar unit pipes adopts plexi-glass tubular to make, each organic glass length of tube 18 ~ 24cm, to avoid the oversize earth pillar that makes of earth pillar unit pipes to fill sample heterogeneity, and ensure earth pillar initial aqueous rate and quality homogeneous.
6. the multisection type Soil moisture of vadose zone diffusibleness analyzer based on One-Dimensional Water advection according to claim 1, it is characterized in that: the earth pillar unit pipes of described multisection type experimental section fills native process and is: sample soil is through air-dry, levigate and sieved by the screen cloth of aperture 2mm, sample soil layering loads compacting, every layer thickness 3cm, for keeping each layer to contact closely, interlayer does ball woll process; After having loaded first earth pillar unit pipes, connect another earth pillar unit pipes with connecting pipe, continue filling step above, load multiple earth pillar unit pipes composition multisection type experimental section successively.
7. the multisection type Soil moisture of vadose zone diffusibleness analyzer based on One-Dimensional Water advection according to claim 1, it is characterized in that: described water supply process is first open the operation valve A be connected with water tank, supply water to hydroecium section, when hydroecium section is full of water, filtering layer section part satisfy water time closed control valve A, then open the operation valve B be connected with geneva bottle.
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| CN108956944A (en) * | 2018-06-25 | 2018-12-07 | 河海大学 | A kind of porous media moisture and solute transport experiments device and experimental method |
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