CN108990452A - A kind of replacement of coupling water table aquifer salt-fresh water and Leaching and desalinization device - Google Patents
A kind of replacement of coupling water table aquifer salt-fresh water and Leaching and desalinization device Download PDFInfo
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- CN108990452A CN108990452A CN201810516742.8A CN201810516742A CN108990452A CN 108990452 A CN108990452 A CN 108990452A CN 201810516742 A CN201810516742 A CN 201810516742A CN 108990452 A CN108990452 A CN 108990452A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B77/00—Machines for lifting and treating soil
Abstract
The invention discloses a kind of replacement of coupling water table aquifer salt-fresh water and Leaching and desalinization devices, including field desalination component, saline treatment component and rainwater-collecting wetland.Field desalination component includes several desalination units, water inlet member and water drainage part, and each desalination unit includes desalination unit profile, water inlet branch components and subregion partition；Saline treatment component includes sedimentation basin, overflow weir, Ecological Corridor and screen pipe；Rainwater-collecting wetland includes impermeable stratum, collecting-tank, distribution well, perforation communicating pipe and water storage porous media.One aspect of the present invention carries out changing water to saline and alkaline soil underground water, desalinates underground water gradually by several circulations；On the other hand by the way of brackish water and rainwater rotation flow, the freshwater resources of coastal region preciousness had not only been saved, but also the rainwater of collection is made full use of to be added in the circulation of underground latent water layer, thus, fundamentally solve the problems, such as beach saline land desalination.
Description
Technical field
The present invention relates to salt-soda soils to irrigate field, especially a kind of coupling water table aquifer salt-fresh water replacement and Leaching and desalinization dress
It sets.
Background technique
Coastal beach is the important reserve land resources in China, is with solving Chinese people contradictory effective measures.
The maximum limiting factor of the exploitation of Coastal beach is that saline Land is serious, it is difficult to realize and enclose tideland for cultivation plantation etc. on a large scale
Rural activity.Causing saline Land main cause is that underground water and salt alkalization is serious, specifically there is following three kinds of situations.
1. underground latent water water level increases when rainy season set, salt water is taken to soil body surface, when groundwater level decline,
Salt branch is adsorbed on solid particle and stays in the soil body.
2. soil surface evaporation aggravates scattering and disappearing for soil body surface moisture, causes more serious salt to analyze, remain on soil
Ground surface.
3. the capillary accumulation of salt in the surface soil is also that cannot be neglected one to cause saline Land reason.
By above-mentioned analysis, causes the main problem of saline Land or soil diving salinization of soil serious, how to reduce
Soil diving salinization and alkalization will fundamentally solve the problems, such as beach saline land desalination.
Summary of the invention
In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a kind of coupling water table aquifer is salty
Fresh water replacement and Leaching and desalinization device, coupling water table aquifer salt-fresh water replacement and Leaching and desalinization device one side are to saline and alkaline soil
It is lauched and carries out changing water, desalinate underground water gradually by several circulations；On the other hand the side of brackish water and rainwater rotation flow is used
Formula, had not only saved the freshwater resources of coastal region preciousness, but also the circulation for making full use of the rainwater of collection to be added to underground latent water layer
In, thus, fundamentally solve the problems, such as beach saline land desalination.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of replacement of coupling water table aquifer salt-fresh water and Leaching and desalinization device, including field desalination component, saline treatment component and rain
Water collects wetland.
Field desalination component includes several desalination units, water inlet member and water drainage part.
The quantity of desalination unit and the quantity of field plots are equal, each desalination unit include desalination unit profile, into
Water branch component and subregion partition；Wherein, desalination unit profile is the profile of corresponding field plots, including lateral contour and vertical
Profile.
Water inlet member includes water inlet trunk canal, water inlet branch canal, fresh water lift pump and several pumped wells in situ.
Water inlet branch components include water inlet pipe, brackish water lift pump, determine head well and water intaking lock.
Water drainage part includes arterial drainage, draining branch canal and salt discharge hidden pipe.
Salt discharge hidden pipe arranged direction is parallel with water inlet pipe direction, and every salt discharge hidden pipe is equidistantly embedded in the transverse direction of desalination unit
In the range of the 0.8m-1.2m of profile underground.
The field plots surface of the adjacent two salt discharges hidden pipe intermediate zone in front and back, the water inlet end of water inlet pipe is arranged in water inlet pipe
It is connected by brackish water lift pump with pumped well in situ.
The intermediate junction of the two neighboring desalination unit in left and right is arranged in pumped well in situ, and is respectively positioned on corresponding water inlet branch
On the axis of canal, all water inlet branch canal pass through water intaking lock and are connected with water inlet trunk canal, and fresh water lift pump is arranged on the trunk canal that intakes.
Field plots surface between the adjacent two salt discharge hidden pipes in front and back is equidistantly laid with centered on drainpipe
Several pieces of subregion partitions.
The height of subregion partition is gradually successively decreased from water inlet pipe side to both ends, and the maximum height of subregion partition is not higher than desalination list
The height of first profile.
It drains branch canal and salt discharge hidden pipe is perpendicular, and is adjacent with far from the vertical profile of desalination unit of pumped well in situ
Closely；One end of every salt discharge hidden pipe is connected with draining branch canal, other end closing；Every draining branch canal is connected with arterial drainage
It is logical.
Determine head well to be equidistantly laid on the central axis of draining branch canal, determines the bottom of head well through entire field
The underground latent water layer in plot.
Saline treatment component includes sedimentation basin, overflow weir, Ecological Corridor and screen pipe；The water outlet end of arterial drainage protrudes into
In sedimentation basin, overflow weir is arranged in the sedimentation basin middle and upper part of Ecological Corridor side, one end of screen pipe and the infiltration of Ecological Corridor
Water layer is connected, filled with filtering particle in screen pipe.
Rainwater-collecting wetland includes impermeable stratum, collecting-tank, distribution well, perforation communicating pipe and water storage porous media；It is impermeable
Water layer is laid in the underground of excavation, and water storage porous media is laid on above impermeable stratum, and is equipped with around water storage porous media
Anti-seepage geomembrane；Distribution well is uniformly distributed in water storage porous media, the one end for communicating pipe of perforating and the water outlet phase of screen pipe
Connection is connected in the middle part of perforation communicating pipe with all distribution wells, and perforation communicating pipe tail end is connected with collecting-tank；Collecting-tank with into
The water inlet end in water trunk canal is connected.
Distribution well, which also passes through, to be determined each of communicating pipe and desalination unit head well and is connected.
It is provided with salinity sensor on overflow weir, salt discharge hole is provided on sedimentation basin.
The water outlet of arterial drainage is provided with flow control pump.
Field plots successively includes humus layer, mixed layer and native soil layer from top to bottom, and mixed layer is admixture and surface layer
The mixture of saline-alkali soil.
Admixture is sand, rubble and sawdust, and admixture is uniformly mixed by way of deep ploughing with surface layer saline-alkali soil；Humus
Layer includes stalk and sawdust.
Kind is implanted with beach plant on water storage porous media.
Salt discharge hidden pipe diameter is 15-25cm, is equipped with a circle metalling around salt discharge hidden pipe.
Each desalination unit lays five mouthfuls and determines head well, determines head well crest level lower than distribution well crest level 50-
100cm, and connection is determined to be provided with valve on the communicating pipe between head well and distribution well.
Field plots surface between the adjacent two salt discharge hidden pipes in front and back, six pieces of subregion partitions of equidistant laying, six pieces
Subregion partition is symmetrically distributed in water inlet pipe two sides, and three pieces of subregion partitions positioned at water inlet pipe unilateral side are counted from water inlet pipe side, height
Respectively 15cm, 10cm and 5cm.
Ecological Corridor bottom is laid with gravel packing, and kind is implanted with salt-resistance plant on gravel packing.
The invention has the following beneficial effects:
1, using salt-soda soil underground in situ brackish water to desalting salinized soil, the fresh groundwater money of coastal region preciousness is not only saved
Source, and good desalinization of soil by flooding or leaching effect is produced, while having saved the investment of conveying fresh water pipeline.
2, while pumped well groundwater abstraction in situ is to desalting salinized soil, water table aquifer is descended to mend over the ground using head well is determined
Fresh water is filled, is completed with higher efficiency and water table aquifer is descended to carry out change water to process over the ground, Underground Water in Salinization Area salinity is reduced, from basic
Solve the underground water accumulation of salt in the surface soil and topsoil salification phenomenon.
3, by the way of brackish water, rainwater rotation flow, desalting salinized soil efficiency is improved.
4, determining the fresh water that head well is supplemented is the rainwater that beach is collected, effectively save coastal region underground water fresh water money
Source.
5, the saline and alkaline ground surface of desalination forms larger driving head by the way of subregion irrigation inside salt-soda soil, close
Salt discharge hidden pipe position forms smaller driving head, improves desalting salinized soil efficiency.
6, admixture is added on soil layer surface, and does deep ploughing uniform treatment, increases the infiltration coefficient of topsoil, increases desalination
Efficiency, and carbon source and humus are provided for later period planting.
7, after completing desalination task, field plots is also used as this desalination canal system in later period planting process
The irrigation and drainage system with functions in farmland uses, and while meeting farmland irrigating drainage, also realizes and is recycled to coastal region irrigation water, increases
Irrigation water service efficiency.
8, there are one numerical simulation results by the design, are proved and can be effectively reduced ground with the mode of degree of saltiness water coke slurry
The salinity of lower diving underground water.
Detailed description of the invention
Fig. 1 shows the structural schematic diagram of a kind of coupling water table aquifer salt-fresh water replacement of the present invention and Leaching and desalinization device.
Fig. 2 shows Section A-A schematic diagram in Fig. 1.
Fig. 3 shows section B-B schematic diagram in Fig. 1.
Fig. 4 shows the enlarged diagram of two neighboring desalination unit.
Fig. 5 shows M-M schematic cross-section in Fig. 4.
Fig. 6, which is shown, determines head well arrangement schematic diagram.
Fig. 7 shows water table aquifer concentration field isopleth variation diagram in water table aquifer salt-fresh water replacement process.
Fig. 8 shows 2m underground water salinity change isopleth variation diagram under earth's surface.
Wherein have:
10. desalination unit；
11. desalination unit profile；
121. intake trunk canal；122. branch canal of intaking；123. fresh water lift pump；124. pumped well in situ；125. brackish water lift pump；
126. water inlet pipe；127. determining head well；128. lock of fetching water；
13. subregion partition；
141. arterial drainage；142. draining branch canal；143. salt discharge hidden pipes；144. metalling；
15. field plots；151. humus layer；152. mixed layer；153. native soil layer；
21. sedimentation basin；211. flow controls pump；212. salt discharge holes；
22. overflow weir；23. Ecological Corridor；231. gravel packing；24. screen pipe；
30. rainwater-collecting wetland；
31. impermeable stratum；32. collecting-tank；33. distribution well；34. perforating communicating pipe；35. water storage porous media；
40. ground elevation.
Specific embodiment
Xia Mianjiehefutuhejuti compare Jia Shishifangshiduibenfamingzuojinyibuxiangxishuoming.
As shown in Figure 1, a kind of coupling water table aquifer salt-fresh water replacement and Leaching and desalinization device namely irrigation and drainage system with functions, including field
Between desalination component, saline treatment component and rainwater-collecting wetland 30.
Field desalination component includes several desalination unit 10, water inlet member and water drainage parts.
The quantity of desalination unit and the quantity of field plots are equal, and in Fig. 1, desalination component in field is on lateral and vertical
It include several desalination units as shown in overstriking black surround.In the application, the lateral left and right that is also referred to as is to vertical also referred to as longitudinal direction
Or front and back to.
Each desalination unit includes desalination unit profile 11, water inlet branch components and subregion partition 13.
Desalination unit profile is the profile of corresponding field plots, including lateral contour and vertical profile.
As shown in Figure 1 and Figure 4, if water inlet member include water inlet trunk canal 121, water inlet branch canal 122, fresh water lift pump 123 and
Dry pumped well 124 in situ.
Water drainage part includes arterial drainage 141, draining branch canal 142 and salt discharge hidden pipe 143.
Salt discharge hidden pipe arranged direction is parallel with water inlet pipe direction, and every salt discharge hidden pipe is equidistantly embedded in the transverse direction of desalination unit
In the range of the 0.8m-1.2m of profile underground.Every salt discharge hidden pipe runs through adjacent two pieces of field plots namely adjacent two pieces of fields
Plot shares a set of salt discharge hidden pipe.
Salt discharge hidden pipe diameter is preferably 15-25cm, and a circle metalling as shown in Figure 5 is preferably equipped with around salt discharge hidden pipe
144.The effect of metalling is to speed up drainage efficiency, while preventing blocking salt discharge hidden pipe.
As shown in Figure 1 and Figure 4, water inlet branch components include water inlet pipe 126, brackish water lift pump 125, determine head well
127 and water intaking lock 128.
Water inlet pipe is arranged in the field plots surface of the adjacent two salt discharges hidden pipe intermediate zone in front and back, and with salt discharge hidden pipe phase
In parallel；The water inlet end of water inlet pipe is connected by brackish water lift pump with pumped well in situ.
The intermediate junction of the two neighboring desalination unit in left and right is arranged in pumped well in situ, and is respectively positioned on corresponding water inlet branch
On the axis of canal, all water inlet branch canal pass through water intaking lock and are connected with water inlet trunk canal, and fresh water lift pump is arranged on the trunk canal that intakes,
Namely two desalination units share a pumped well in situ, so that can guarantee that it is provided for the two pieces of desalination units in left and right basins irrigation water
Source.
Field plots surface between the adjacent two salt discharge hidden pipes in front and back is equidistantly laid with centered on drainpipe
Several pieces of subregion partitions 13.
The height of subregion partition is gradually successively decreased from water inlet pipe side to both ends, and the maximum height of subregion partition is not higher than desalination list
The height of first profile.
As shown in figure 5, the field plots surface between the adjacent two salt discharge hidden pipes in front and back, is preferably equidistantly laid with six
Block subregion partition, six pieces of subregion partitions are symmetrically distributed in water inlet pipe two sides, positioned at water inlet pipe unilateral side three pieces of subregion partitions from into
Water pipe side is counted, and height is respectively 15cm, 10cm and 5cm.
The setting of subregion partition, can be that is, first two salt discharge hidden pipe middle sections in such a way that subregion irrigates salt discharge
It irrigates, then has stepped through overflow manner and gradually extended to two sides, there is complete water storage on final entire desalination soil surface.According to
Present invention setting, desalination soil surface are divided into three different water level regions by subregion partition, are followed successively by from inside to both sides water level
15cm、10cm、5cm。
It drains branch canal and salt discharge hidden pipe is perpendicular, and is adjacent with far from the vertical profile of desalination unit of pumped well in situ
Closely；One end of every salt discharge hidden pipe is connected with draining branch canal, other end closing；Every draining branch canal is connected with arterial drainage
It is logical.
Each desalination unit preferably lays five mouthfuls and determines head well, determines the center that head well is equidistantly laid in draining branch canal
On axis, the bottom for determining head well is connected with the underground latent water layer of field plots.
As shown in figure 5, field plots preferably successively includes humus layer 151, mixed layer 152 and native soil layer from top to bottom
153, mixed layer is preferably the mixture of admixture Yu surface layer saline-alkali soil.Stalks mulching steams to provide carbon source and reduce soil
Hair.
Admixture is preferably sand, rubble and sawdust etc., and admixture mixes preferably by way of deep ploughing with surface layer saline-alkali soil
Uniformly；Humus layer preferably includes stalk and sawdust etc..Addition admixture is to improve surface layer soil permeability and provide carbon source.
Saline treatment component includes sedimentation basin 21, overflow weir 22, Ecological Corridor 23 and screen pipe 24.
The water outlet end of arterial drainage protrudes into sedimentation basin, and the water outlet of arterial drainage is preferably provided with flow control pump
211。
As shown in Fig. 2, overflow weir is arranged in the sedimentation basin middle and upper part of Ecological Corridor side, it is preferably provided on overflow weir
Salinity sensor is provided with salt discharge hole 212 on sedimentation basin.
As shown in figure 3, Ecological Corridor bottom is preferably laid with gravel packing 231, it is implanted with for preferred kind on gravel packing
Salt-resistance plant.
One end of screen pipe is connected with the permeable layer of Ecological Corridor, filled with filtering particle in screen pipe.
Rainwater-collecting wetland includes impermeable stratum 31, collecting-tank 32, distribution well 33, perforation communicating pipe 34 and porous Jie of water storage
Matter 35.Impermeable stratum is laid in the underground of excavation, and water storage porous media is laid on above impermeable stratum, and water storage porous media week
It encloses and is equipped with anti-seepage geomembrane, kind is implanted with beach plant on water storage porous media.
Distribution well is uniformly distributed in water storage porous media, and the one end for communicating pipe of perforating is connected with the water outlet of screen pipe
It connects, is connected in the middle part of perforation communicating pipe with all distribution wells, perforation communicating pipe tail end is connected with collecting-tank；Collecting-tank and water inlet
The water inlet end in trunk canal is connected.
As shown in fig. 6, distribution well also passes through and determines each of communicating pipe and desalination unit head well and be connected, head is determined
Well crest level is preferably shorter than distribution well crest level 50-100cm, and connection was determined on the communicating pipe between head well and distribution well
It is preferably provided with valve.
A kind of beach desalination process of coupling water circulation, includes the following steps.
Step 1, irrigation and drainage system with functions and desalination unit are laid: the case where according to the landform of beach saline land, landforms, it is assumed that with sea
The parallel direction in boundary is lateral, is longitudinal with seashore circle vertical direction；Water inlet trunk canal, arterial drainage are flat with seashore circle respectively
Row is arranged entire beach irrigation and drainage system with functions, i.e., is filled row system along seashore circle on the basis of the trunk canal that intakes, arterial drainage arranged direction
System can arrange that, wherein inlaying several desalination units in entire irrigation and drainage system with functions, desalination unit lateral dimension is set up to 5-10km
It sets between 100-200m, longitudinal (or vertical) size of desalination unit is located between 20-40m.
Step 2, be drilled with pumped well in situ: pumped well in situ is arranged in on water branch canal axis, and the well yield that draws water in situ is answered
It is arranged according to desalination unit size, a bite original position pumped well can provide for the adjacent two pieces of desalination units in left and right basins irrigation water source.
Step 3, arrangement determines head well: determine head well and is arranged on draining branch canal axis, every piece of desalination unit corresponding five
Mouth determines head well, and spacing determines head well and be connected with distribution well by communicating pipe depending on the size for the unit that draws water, distribution well
Crest level, which is higher than, determines head well crest level 50-100cm, and guarantee determines head well water level and is not less than salt discharge hidden pipe crest level, excellent
Choosing is higher than salt discharge hidden pipe crest level 0-1m.
Step 4, arrange salt discharge hidden pipe: salt discharge hidden pipe is equidistantly embedded in the lateral contour underground 0.8m-1.2m of desalination unit
In the range of, and it is perpendicular with draining branch canal axis direction, salt discharge hidden pipe diameter is 15-25cm, salt discharge hidden pipe spacing and selection
Desalination unit size it is corresponding, spacing dimension is between 20-40m.
Step 5, field plots is smooth: first admixture being added in the saline-alkali soil of surface layer, admixture includes sand, rubble and wood
Admixture is uniformly mixed and smooth by bits in the way of ploughing deeply with surface layer saline-alkali soil, formation mixed layer；Then, mixed
It closes layer surface and covers one layer of humus layer, humus layer includes stalk or sawdust etc.；Therefore field plots is divided into from top to bottom
Humus layer, mixed layer and native soil layer.The thickness of humus layer and mixed layer is preferably respectively 5cm, 50-100cm.
Step 6, the brackish water desalinization of soil by flooding or leaching: salt-soda soil is extracted using pumped well in situ and descends in water table aquifer brackish water to field in situ
Plot carries out the irrigation desalinization of soil by flooding or leaching, and holding field irrigation depth is 5-15cm；Head is determined using be arranged in desalination unit two sides simultaneously
Well is to descending to supplement fresh water in water table aquifer in situ, to carry out degree of saltiness water coke slurry to salt-soda soil original position underground water.
Step 7, the brackish water desalinization of soil by flooding or leaching drains: elution salt water being expelled to sedimentation basin using salt discharge hidden pipe and is precipitated, is located at
The light salt water on sedimentation basin top flows into Ecological Corridor by overflow weir, connects after Ecological Corridor filters through filter layer, then perforated
Siphunculus is recycled in collecting-tank, for water in recycling.
Salinity sensor is preferably provided on overflow weir, for monitoring the salinity for flowing through the recycle-water of overflow weir；Work as inspection
When measuring salinity greater than 3 ‰, overflow weir is closed, and the salt discharge hole on sedimentation basin is opened, and return water is discarded；When detecting salinity not
When lower than 3 ‰, overflow weir is again turned on, salt discharge bore closure, carries out return water recycling.
In addition, overflow weir elevation of weir crest is preferably higher than sedimentation basin Bottom Altitude 1.5-2m.
Step 8, rainwater-collecting: rainwater conflux is to rainwater-collecting wetland surface, by beach plant and water storage porous media
After filtering, into distribution well, determine in head well and collecting-tank, is natural fresh water.
Rainwater-collecting wetland is arranged in by seashore circle side, and the crest level of rainwater-collecting wetland is compared with adjacent domain littoral zone
Elevation is slightly lower, therefore is easy to make at rainwater conflux to rainwater-collecting wetland, meanwhile, it is located at seashore circle side, it also can be to a certain degree
Upper prevention seawater invasion.
In addition, rainwater-collecting wetland surrounding piles up the alley formed with having spoil, the high 20cm of alley, and rainwater-collecting is wet
Ground water storage surrounding does antiseepage with geomembrane, prevents salt water in water-bearing layer from flowing backward into rainwater-collecting wetland.
Rainwater-collecting wetland width is 5-7m, and length is corresponding with irrigation and drainage system with functions length；Kind is implanted on rainwater-collecting wetland
Beach plant.
Step 9, the fresh water desalinization of soil by flooding or leaching: in par season, after the underground brackish water irrigation desalinization of soil by flooding or leaching 48 hours, stop utilizing brackish water
The desalinization of soil by flooding or leaching；Then, water intaking lock is opened, fresh water water lift pump work, and the fresh water in collecting-tank is passed sequentially through into water trunk canal, water inlet branch canal
And water inlet pipe, it carries out the fresh water desalinization of soil by flooding or leaching 6 hours；In wet season, cooperate weather forecast, before rainfall, is filled first with underground brackish water
The desalinization of soil by flooding or leaching is irrigate, reaches predetermined extent to rainfall, preferably irrigating is 48 hours, then stops extracting brackish water, utilizes the rainwater desalinization of soil by flooding or leaching.
Step 10, the fresh water desalinization of soil by flooding or leaching drains: in the way of step 7, being drained, and forms water in recycling.When detecting
When salinity is greater than 3 ‰, overflow weir is closed, and the salt discharge hole on sedimentation basin is opened, and return water is discarded；When detecting that salinity is not less than
When 3 ‰, overflow weir is again turned on, salt discharge bore closure, carries out return water recycling.
Step 11, it washes brine recycling: repeating step 6 to step 10, brine recycling is washed in formation.
The invention has the following beneficial effects:
1, irrigation and drainage task when with can completing beach saline-alkali early period desalination of the invention is developed.
2, the present invention can effectively reduce the waste of water resource in beach desalination processes, increase water application efficiency.
3, field plots, rainwater-collecting wetland can be made to form a complete water cycle process, can be effectively reduced field
Between Soil salinity content in region.
4, salinity processing component can recycle a part of saline-alkali water and is added in water circulation again, reduce and abandon water rate.
5, rainwater-collecting wetland can be filtered rainwater, improve storage water quality.Meanwhile rainwater-collecting wetland table
Beach halophytes is planted in face, can absorb beach salinity, and is conducive to protect beach environment, develops with alleviating beach saline-alkali
Caused head is lost.
6, rainwater-collecting wetland is located at coastal waters side, can resist the seawater invasion of a part of unconfined aquifer, guarantees
Inwelling caused by during to beach saline-alkali ground water development.(for example, will lead to sea when littoral zone pumped well draws water
Water flows backward, and inwelling will bring permanent damage to littoral zone underground water)
The present invention is directed to said effect, and case is preferably implemented using the following two kinds and is illustrated.
Analysis of cases 1
It shows that degree of saltiness water coke slurry designed by the present invention reduces the efficiency of salt-soda soil water table aquifer underground water salinity, uses numerical simulation
Mode simulate after the degree of saltiness water coke slurry brine strength distribution map in water-bearing layer.
Numerical simulation is carried out using Groundwater Vistas software package, utilizes wherein MODFLOW module simulation flow field
With MT3D module simulation solute transfer.
Solute transfer in unconfined aquifer is simulated, the typical desalting salinized soil unit size that the present invention is handled is chosen, if
Setting desalination unit (hereinafter referred to as model) length size is respectively 200m × 40m × 10m, and the discrete spacing of length is
1m, 1m, 0.5m, the total number of model discrete element are 160,000.Model is homogeneous, isotropic infiltration field, infiltration coefficient
K=10m/d permeates field porosity n=0.35, storativity s=0.01, longitudinal gas flow (Parallel to the flow direction) DL=2m, laterally
Dispersion coefficient DT, vertical dispersion coefficient DVIt is 0.2m, water-bearing layer underground water initial concentration is 10kg/m3.Modeling total duration
It is 45 days, the time step of simulated flow pattern is 1d, and the time step for simulating solute transfer is 0.2d.
Above-mentioned discrete spacing is a kind of dialect of numerical simulation calculation, is primarily referred to as calculating " desalination unit " with model
It when the water level of this block models, salt content, needs entire desalination unit to carry out discrete, becomes small member one by one
Element is calculated, and by discrete, calculated result can be made to be more nearly actual conditions, discrete is exactly that a bulk is become one
A fritter, increases computational accuracy, makes to calculate closer to the truth.
1m, 1m, 0.5m herein is respectively referred on three directions of length, width and height, the minimum range of division, and discrete element is exactly
This desalination unit is divided into how many a fritters.
As shown in fig. 7, the underground water concentration field isopleth variation diagram in the shown section where pumped well, due to model
It is symmetrical in the longitudinal direction, therefore only draws left side simulation result.X represents length direction, and Z represents depth direction, sits
Origin water phreatic surface located underground (since the littoral zone gradient is relatively slow, it is assumed that underground latent water face is level) is marked, determines head well location in X
On=0m axis, pumped well in situ is located on X=100m axis, and wherein isopleth unit is kg/m3.As seen from Figure 7, from 5
, in 45 days, high concentration isopleth elapses always to the right for it, this is because left border is to determine head well, right side boundary is
Pumped well in situ, in situ while pumped well groundwater abstraction, left side determines head well and fresh water is continuously replenished to water-bearing layer, causes
High concentration isopleth elapses to the right, to gradually decrease water-bearing layer underground water salinity.It can also be seen that the model from Fig. 7
When running to 45 days, 2kg/m3Isopleth almost to around pumped well, show this method can quickly to underground water into
Row degree of saltiness water coke slurry shows that the invention can quickly reduce salt-soda soil underground reservoir underground water salinity.
Analysis of cases 2
It proves that subregion irrigates to irrigate than not subregion and increases desalting efficiency, the desalination of saline-alkali soil is simulated by way of numerical simulation
Journey, meanwhile, also demonstrating brackish water also has good effect to salt-soda soil irrigation desalination.
Numerical simulation is carried out using Groundwater Vistas software package, utilizes wherein MODFLOW module simulation flow field
With MT3D module simulation solute transfer.
The Salt Transport Characteristics in Soil rule in the desalination processes of salt-soda soil is simulated, desalination unit selection of dimension is 20m × 0.1m × 2m, by
Spacing between two salt discharge hidden pipes is traditionally arranged to be 20m, since Salt Transport Characteristics in Soil rule is according between two salt discharge hidden pipes
Between section be symmetric, therefore simulate and only choose a half-size scale, i.e. 10m, therefore the length of simulation model is respectively set to 10m
× 0.1m × 2m, discrete spacing is respectively 0.1m, 0.1m, 0.05m, therefore the total number of model discrete element is 4,000.Due to de-
Salt unit is similar along salt discharge hidden pipe direction Salt movement rule, therefore can set moulded dimension to along salt discharge hidden pipe direction
0.1m.In addition, since desalination processes are solely focused on the Salt Transport Characteristics in Soil rule of topsoil, therefore topsoil is only selected to two meters of underground
Range.
Model is homogeneous, isotropic infiltration field, and coefficient of permeability K=10m/d permeates field porosity n=0.35, releases water system
Number s=0.01, longitudinal gas flow (Parallel to the flow direction) DL=2m, lateral dispersion coefficient DT, vertical dispersion coefficient DVIt is 0.2m,
Water-bearing layer underground water initial concentration is 10kg/m3.Modeling total duration is 10 days, and the time step of simulated flow pattern is 1d, mould
The time step of quasi- solute transfer is 0.2d.
The simulation process will be arranged two kinds of irrigation methods and be compared, and a kind of traditional irrigation desalination mode is applied to model
Surface 10cm high drives head (keeping 10cm high water storage on desalination soil surface when irrigating desalination), and another is institute of the present invention
The subregion of it is proposed irrigates salt discharge mode, i.e., first irrigates two salt discharge hidden pipe middle sections, then have stepped through overflow manner by
It walks and is extended to two sides, there is complete water storage on final entire desalination soil surface.Arranged according to the present invention, desalination soil surface passes through
Subregion partition is divided into three different water level regions, is followed successively by 15cm, 10cm, 5cm from inside to both sides water level.The model chooses desalination
The half in soil is simulated, therefore is followed successively by 15cm, 10cm, 5cm from right side water level of turning left.Due to simulating brackish water desalination effect,
Therefore the washing water that desalination soil surface is applied in simulation process is to determine concentration brackish water, concentration 2.5kg/m3.Meanwhile
Salt discharge hidden pipe is set at model left border 1m elevation.
As shown in figure 8, left-half is traditional irrigation desalination mode in figure, right half part is that subregion irrigates desalination mode.
Curve represents isopleth, unit kg/m in Fig. 83。
In fig. 8 it is shown that two kinds of Different Irrigation Methods layer soil Salt Transport Characteristics in Soil are as a result, X represents length direction, Z generation
Table depth direction, coordinate origin are located at ground.Wherein left side is the Salt Transport Characteristics in Soil of traditional irrigation desalination mode as a result, right side is this
The subregion that invention provides irrigates the Salt Transport Characteristics in Soil of desalination mode as a result, wherein isopleth unit is kg/m3.It is irrigated and is taken off due to subregion
Salt mode is gradually extended to two sides from inside by overflow manner, and there is complete water storage on final entire desalination soil surface, but
The time of this process is shorter, compared on the scale compared with day, can ignore and not consider.
From first day to the tenth from the point of view of day analog result, salinity isopleth is moved back downwards always in two kinds of irrigation methods, explanation
Brackish water irrigation has good effect to saline-alkali soil desalination.In addition, comparison two sides concentration distribution of contours figure is it can be found that subregion
It is good to irrigate the more high-efficient than tradition desalination mode of desalination mode, effect, in traditional irrigation desalination mode, since the 6th day,
4kg/m3Equivalent line position almost no longer changes, and subregion irrigates desalination mode 4kg/m3Equivalent line position still moves back downwards, two
The effect of salt discharge hidden pipe intermediate region desalination is also more preferably.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail, in range of the technology design of the invention.
Claims (10)
1. a kind of coupling water table aquifer salt-fresh water replacement and Leaching and desalinization device, it is characterised in that: including field desalination component, salt water
Processing component and rainwater-collecting wetland；
Field desalination component includes several desalination units, water inlet member and water drainage part；
The quantity of desalination unit and the quantity of field plots are equal, and each desalination unit includes desalination unit profile, water inlet point
Branch component and subregion partition；Wherein, desalination unit profile is the profile of corresponding field plots, including lateral contour and vertical wheel
It is wide；
Water inlet member includes water inlet trunk canal, water inlet branch canal, fresh water lift pump and several pumped wells in situ；
Water inlet branch components include water inlet pipe, brackish water lift pump, determine head well and water intaking lock；
Water drainage part includes arterial drainage, draining branch canal and salt discharge hidden pipe；
Salt discharge hidden pipe arranged direction is parallel with water inlet pipe direction, and every salt discharge hidden pipe is equidistantly embedded in the lateral contour of desalination unit
In the range of the 0.8m-1.2m of underground；
The field plots surface of the adjacent two salt discharges hidden pipe intermediate zone in front and back is arranged in water inlet pipe, and the water inlet end of water inlet pipe passes through
Brackish water lift pump is connected with pumped well in situ；
The intermediate junction of the two neighboring desalination unit in left and right is arranged in pumped well in situ, and is respectively positioned on corresponding water inlet branch canal
On axis, all water inlet branch canal pass through water intaking lock and are connected with water inlet trunk canal, and fresh water lift pump is arranged on the trunk canal that intakes；
Field plots surface between the adjacent two salt discharge hidden pipes in front and back is equidistantly laid with several centered on drainpipe
Block subregion partition；
The height of subregion partition is gradually successively decreased from water inlet pipe side to both ends, and the maximum height of subregion partition is not higher than desalination unit wheel
Wide height；
It drains branch canal and salt discharge hidden pipe is perpendicular, and is adjoining with the vertical profile of the desalination unit far from pumped well in situ；Often
One end of root salt discharge hidden pipe is connected with draining branch canal, other end closing；Every draining branch canal is connected with arterial drainage；
Determine head well to be equidistantly laid on the central axis of draining branch canal, determines the bottom of head well through entire field plots
Underground latent water layer；
Saline treatment component includes sedimentation basin, overflow weir, Ecological Corridor and screen pipe；The water outlet end of arterial drainage protrudes into precipitating
Chi Zhong, overflow weir are arranged in the sedimentation basin middle and upper part of Ecological Corridor side, one end of screen pipe and the permeable layer of Ecological Corridor
It is connected, filled with filtering particle in screen pipe；
Rainwater-collecting wetland includes impermeable stratum, collecting-tank, distribution well, perforation communicating pipe and water storage porous media；Impermeable stratum
It is laid in the underground of excavation, water storage porous media is laid on above impermeable stratum, and is equipped with antiseepage around water storage porous media
Geomembrane；Distribution well is uniformly distributed in water storage porous media, and the one end for communicating pipe of perforating is connected with the water outlet of screen pipe,
It is connected in the middle part of perforation communicating pipe with all distribution wells, perforation communicating pipe tail end is connected with collecting-tank；Collecting-tank and water inlet are dry
The water inlet end of canal is connected；
Distribution well, which also passes through, to be determined each of communicating pipe and desalination unit head well and is connected.
2. coupling water table aquifer salt-fresh water replacement according to claim 1 and Leaching and desalinization device, it is characterised in that: overflow weir
On be provided with salinity sensor, salt discharge hole is provided on sedimentation basin.
3. coupling water table aquifer salt-fresh water replacement according to claim 1 and Leaching and desalinization device, it is characterised in that: draining is dry
The water outlet of canal is provided with flow control pump.
4. coupling water table aquifer salt-fresh water replacement according to claim 1 and Leaching and desalinization device, it is characterised in that: field
Block successively includes humus layer, mixed layer and native soil layer from top to bottom, and mixed layer is the mixture of admixture and surface layer saline-alkali soil.
5. coupling water table aquifer salt-fresh water replacement according to claim 4 and Leaching and desalinization device, it is characterised in that: admixture
For sand, rubble and sawdust, admixture is uniformly mixed by way of deep ploughing with surface layer saline-alkali soil；Humus layer includes stalk and wood
Bits.
6. coupling water table aquifer salt-fresh water replacement according to claim 1 and Leaching and desalinization device, it is characterised in that: water storage is more
Kind is implanted with beach plant on the medium of hole.
7. coupling water table aquifer salt-fresh water replacement according to claim 1 and Leaching and desalinization device, it is characterised in that: salt discharge is dark
Pipe diameter is 15-25cm, and a circle metalling is equipped with around salt discharge hidden pipe.
8. coupling water table aquifer salt-fresh water replacement according to claim 1 and Leaching and desalinization device, it is characterised in that: each de-
Salt unit lays five mouthfuls and determines head well, determines head well crest level lower than distribution well crest level 50-100cm, and water is determined in connection
Valve is provided on communicating pipe between head well and distribution well.
9. coupling water table aquifer salt-fresh water replacement according to claim 1 and Leaching and desalinization device, it is characterised in that: before being located at
Field plots surface between adjacent two salt discharge hidden pipes afterwards, equidistantly lays six pieces of subregion partitions, and six pieces of subregion partitions symmetrically divide
Cloth is counted in water inlet pipe two sides, three pieces of subregion partitions positioned at water inlet pipe unilateral side from water inlet pipe side, and height is respectively 15cm, 10cm
And 5cm.
10. coupling water table aquifer salt-fresh water replacement according to claim 1 and Leaching and desalinization device, it is characterised in that: ecology
Corridor bottom is laid with gravel packing, and kind is implanted with salt-resistance plant on gravel packing.
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| CN110990753A (en) * | 2019-11-18 | 2020-04-10 | 河海大学 | Method for calculating leaching effect of concealed pipe system |
| CN112166727A (en) * | 2020-09-22 | 2021-01-05 | 陕西秦草生态环境科技有限公司 | Method for improving saline-alkali soil on two sides of river |
| CN112335368A (en) * | 2020-09-23 | 2021-02-09 | 陕西秦草生态环境科技有限公司 | Method for improving soil in region with groundwater as saline water |
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