CN107761693B - A kind of underground water pollution migration appraisal procedure - Google Patents
A kind of underground water pollution migration appraisal procedure Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000005012 migration Effects 0.000 title claims abstract description 35
- 238000013508 migration Methods 0.000 title claims abstract description 35
- 238000003911 water pollution Methods 0.000 title claims abstract description 24
- 238000009792 diffusion process Methods 0.000 claims abstract description 99
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 92
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- 230000007613 environmental effect Effects 0.000 claims abstract description 8
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- 239000004576 sand Substances 0.000 claims description 8
- 230000035699 permeability Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000005416 organic matter Substances 0.000 claims description 3
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Abstract
The invention discloses a kind of underground water pollutions to migrate appraisal procedure, it is related to the contaminated site positioned at soft clay area, it the following steps are included: (1) collects the environmental hydrogeology situation data of soft clay area superficial part soil layer, and is I type, II type, III type and IV type according to stratigraphy assemblage Type division；(2) stratigraphy assemblage type belonging to the contaminated site is determined；(3) the inside and outside river distribution situation of the contaminated site, including three kinds of situations are determined, has river to be distributed outside without river distribution, contaminated site respectively inside and outside contaminated site, have river distribution in contaminated site；(4) the stratigraphy assemblage type according to belonging to the contaminated site and inside and outside river distribution situation assess diffusion mobility direction and the pollution depth of the contaminated site presence of pollution sources.The invention has the advantages that the foundation of the appraisal procedure effectively improves the recognition efficiency of underground water pollution migration, it is meaningful to the abundant spatial distribution range for holding pollutant and its development trend.
Description
Technical field
The invention belongs to environmental geotechnical technical fields, and in particular to a kind of underground water pollution migration appraisal procedure.
Background technique
Groundwater resources are the grand strategy resources for supporting social sustainable development, and China's groundwater resources amount accounts for about the whole nation
The 1/3 of gross amount of water resources.With Chinese society expanding economy, underground water pollution situation is increasingly serious, some areas underground water
Pollution problem is very prominent.Underground water pollution present from point to surface, from shallow to deep, by the extension trend in city to rural area, pollute
Degree is got worse, and underground water pollution public hazard incident takes place frequently and causes to seriously endanger, and there is an urgent need to carry out underground water pollution reparation
It administers.
The basic premise for implementing underground water pollution control is the abundant sky for holding pollutant in soil and groundwater environment
Between distribution characteristics.It can be on the basis for obtaining representative point pollution condition by quickly detecting or sampling the technological means such as chemical examination
The current spatial distribution situation of upper analysis pollutant.But the data volume obtained by inquiry is limited, can not obtain contaminant transportation
The important informations such as the historical process of variation and future developing trend.Therefore a kind of underground water pollution migration appraisal procedure is needed to make up
These are insufficient.
Summary of the invention
According to the deficiencies of the prior art described above, It is an object of the present invention to provide a kind of underground water appraisal procedures, this is commented
Estimate method the stratigraphy assemblage of soft clay area is classified in advance, so that the affiliated stratum of contaminated site need to be obtained by making technical staff only
In the case that composite type and inside and outside river are distributed, can to the groundwater pollutant in contaminated site in the horizontal direction with
And the diffusion mobility range on depth direction carries out a preliminary assessment.
The object of the invention realization is completed by following technical scheme:
A kind of underground water pollution migration appraisal procedure, is related to the contaminated site positioned at soft clay area, it is characterised in that described
Appraisal procedure the following steps are included:
(1) the environmental hydrogeology situation data of soft clay area superficial part soil layer is collected, and according to stratigraphy assemblage Type division
For I type, II type, III type and IV type；
(2) stratigraphy assemblage type belonging to the contaminated site is determined；
(3) the inside and outside river distribution situation of the contaminated site, including three kinds of situations are determined, respectively inside and outside contaminated site
There is river to be distributed outside without river distribution, contaminated site, have river distribution in contaminated site；
(4) the stratigraphy assemblage type according to belonging to the contaminated site and inside and outside river distribution situation, assess the dirt
Contaminate diffusion mobility direction and the pollution depth of place presence of pollution sources.
The stratigraphy assemblage type includes I type, II type, III type and IV type:
The stratigraphy assemblage type of I type is followed successively by fill stratum, crust layer, mealiness soil layer or silty sand ground, silt from top to bottom
Shale stickiness soil layer；
The stratigraphy assemblage type of II type is followed successively by fill stratum, crust layer, Muddy Bottoms stickiness soil layer from top to bottom, and
Mealiness soil layer or silty sand ground are locally accompanied in the Muddy Bottoms stickiness soil layer；
The stratigraphy assemblage type of III type is followed successively by fill stratum, crust layer, Muddy Bottoms stickiness soil layer from top to bottom；
The stratigraphy assemblage type of IV type be followed successively by from top to bottom fill stratum, crust layer, thick-layer it is plastic-hard plastic cohesive soil
Layer, the thick-layer is plastic-and hard plastic stickiness the thickness of the layer is greater than 3m.
When the stratigraphy assemblage type of contaminated site is I type, the migration for assessing the contaminated site presence of pollution sources is expanded
Dissipate the method for direction and pollution depth are as follows:
If (a) contaminated site it is inside and outside without river be distributed when, pollution sources will to depth direction diffusion mobility, and
Pollutant is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer, moved under pollutant stagnant
It stays in the top of the Muddy Bottoms stickiness soil layer；
If (b) have river distribution outside the contaminated site, pollution sources in the contaminated site will to depth direction with
And direction or the horizontal direction away from the river carry out diffusion mobility, and pollutant is finally stranded in the top of the crust layer
Portion；If missing area is locally present in the crust layer, the top for being stranded in the Muddy Bottoms stickiness soil layer is moved under pollutant；If
When groundwater level in the contaminated site is higher than the river level, then the pollution sources are directed toward the level side in the river
To progress diffusion mobility；If the groundwater level in the contaminated site is lower than the river level, the pollution sources back
Horizontal direction from the river carries out diffusion mobility；
If (c) have river distribution in the contaminated site, pollution sources in the contaminated site will to depth direction with
And direction or the horizontal direction away from the river carry out diffusion mobility, the pollution sources are being directed toward or are deviating from the river direction
Diffusion mobility area will be improved when diffusion mobility on the basis of (b), and pollutant is finally stranded in the crust layer
Top；If missing area is locally present in the crust layer, the top for being stranded in the Muddy Bottoms stickiness soil layer is moved under pollutant；
If the groundwater level in the contaminated site is higher than the river level, the pollution sources are directed toward the level in the river
Direction carries out diffusion mobility；If the groundwater level in the contaminated site is lower than the river level, the pollution sources
Horizontal direction away from the river carries out diffusion mobility.
When the stratigraphy assemblage type of contaminated site is II type, the migration for assessing the contaminated site presence of pollution sources is expanded
Dissipate the method for direction and pollution depth are as follows:
If (a) contaminated site it is inside and outside without river be distributed when, pollution sources will to depth direction diffusion mobility, and
Pollutant is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer, moved under pollutant stagnant
It stays in the top of the Muddy Bottoms cohesive soil；
If (b) have river distribution outside the contaminated site, pollution sources in the contaminated site will to depth direction with
And direction or the horizontal direction away from the river carry out diffusion mobility, and pollutant is finally stranded in the top of the crust layer
Portion；If missing area is locally present in the crust layer, the top for being stranded in the Muddy Bottoms cohesive soil is moved under pollutant；If institute
When stating the groundwater level in contaminated site higher than the river level, then the pollution sources are directed toward the horizontal direction in the river
Carry out diffusion mobility；If the groundwater level in the contaminated site is lower than the river level, the pollution sources deviate from
The horizontal direction in the river carries out diffusion mobility；
If (c) have river distribution in the contaminated site, pollution sources in the contaminated site will to depth direction with
And direction or the horizontal direction far from the river carry out diffusion mobility, the pollution sources are being directed toward or are deviating from the river direction
Diffusion mobility area will be improved when diffusion mobility on the basis of (b), and pollutant is finally stranded in the crust layer
Top；If missing area is locally present in the crust layer, the top for being stranded in the Muddy Bottoms stickiness soil layer is moved under pollutant；
If the groundwater level in the contaminated site is higher than the river level, the pollution sources are directed toward the level in the river
Direction carries out diffusion mobility；If the groundwater level in the contaminated site is lower than the river level, the pollution sources
Horizontal direction away from the river carries out diffusion mobility；
When the stratigraphy assemblage type of contaminated site is III type, the migration for assessing the contaminated site presence of pollution sources is expanded
Dissipate the method for direction and pollution depth are as follows:
If (a) contaminated site it is inside and outside without river be distributed when, pollution sources will to depth direction diffusion mobility, and
Pollutant is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer, moved under pollutant stagnant
It stays in the top of the Muddy Bottoms stickiness soil layer；
If (b) have river distribution outside the contaminated site, pollution sources in the contaminated site will to depth direction into
Row diffusion mobility, and pollutant is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer,
The top for being stranded in the Muddy Bottoms stickiness soil layer is moved under pollutant；
If (c) have river distribution in the contaminated site, pollution sources in the contaminated site will to depth direction into
Row diffusion mobility, and pollutant is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer,
The top for being stranded in the Muddy Bottoms stickiness soil layer is moved under pollutant.
When the stratigraphy assemblage type of contaminated site is IV type, the migration for assessing the contaminated site presence of pollution sources is expanded
Dissipate the method for direction and pollution depth are as follows:
If (a) contaminated site it is inside and outside without river be distributed when, pollution sources will to depth direction diffusion mobility, and
Pollutant is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer, moved under pollutant stagnant
It stays in the top of the plastic-hard plastic stickiness soil layer；
If (b) have river distribution outside the contaminated site, pollution sources in the contaminated site will to depth direction into
Row diffusion mobility, and pollutant is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer,
Moved under pollutant be stranded in the thick-layer it is plastic-top of hard plastic stickiness soil layer；
If (c) have river distribution in the contaminated site, pollution sources in the contaminated site will to depth direction into
Row diffusion mobility, and pollutant is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer,
Moved under pollutant be stranded in the thick-layer it is plastic-top of hard plastic stickiness soil layer.
When the stratigraphy assemblage type of the contaminated site is to have river distribution in or beyond I type and the contaminated site
When, pollution sources in the contaminated site will in the fill stratum and at the top of the crust layer in be directed toward or deviate from the river
The horizontal direction of stream carries out diffusion mobility.
When the stratigraphy assemblage type of the contaminated site is to have river distribution in or beyond II type and the contaminated site
When, pollution sources in the contaminated site will in the fill stratum and at the top of the crust layer in be directed toward or deviate from the river
The horizontal direction of stream carries out diffusion mobility.
The method for determining stratigraphy assemblage type belonging to the contaminated site are as follows: each stratum group in the soft clay area
It closes type and is respectively provided with corresponding geographical position coordinates range；According to the geographical position coordinates value of the contaminated site,
Inquiry determines the affiliated stratigraphy assemblage type of the contaminated site position.
The appraisal procedure further includes the steps that determining Dominated Factors, the Dominated Factors include soil layer permeability parameter,
Particle composition and the content of organic matter and the contaminated time of level of ground water nourishment condition, the soil body, to assess moving for pollution sources
Move diffusion velocity.
The invention has the advantages that the appraisal procedure is simple and quick, it can be inside and outside based on stratigraphy assemblage type, contaminated site
River distribution and Dominated Factors are fixed really, are quickly carried out preliminary estimating to the underground water pollution in contaminated site and are sentenced
It is disconnected, the recognition efficiency of underground water pollution migration is effectively improved, to the abundant spatial distribution range and its development for holding pollutant
Trend is meaningful.
Detailed description of the invention
Fig. 1 is the schematic diagram of contaminated site in the embodiment of the present invention 2；
Fig. 2 is pollutant migration and diffusion schematic diagram of the contaminated site after 50 days in the embodiment of the present invention 2；
Fig. 3 is pollutant migration and diffusion schematic diagram of the contaminated site after 1450 days in the embodiment of the present invention 2.
Specific embodiment
Feature of the invention and other correlated characteristics are described in further detail by embodiment below in conjunction with attached drawing, with
Convenient for the understanding of technical staff of the same trade:
Such as Fig. 1-3, label 1-4 is respectively as follows: contaminated site 1, river 2, garbage transfer station 3, flight-line maintenance region 4 in figure.
Embodiment 1: the present embodiment migrates appraisal procedure more particularly to a kind of underground water pollution, which specifically includes
Following steps:
(1) the environmental hydrogeology situation data of soft clay area superficial part soil layer is collected, and according to stratigraphy assemblage Type division
For I type, II type, III type and IV type, the soft clay area in the present embodiment can be collected according to administrative division, e.g.
Soft clay area is with being selected as the superficial part within the scope of 20 meters of Shanghai City area below ground in the range of county, city, province, in the present embodiment
Layer；Wherein:
The stratigraphy assemblage type of I type is followed successively by fill stratum, crust layer, mealiness soil layer or silty sand ground, Muddy Bottoms from top to bottom
Stickiness soil layer；
The stratigraphy assemblage type of II type is followed successively by fill stratum, crust layer, Muddy Bottoms stickiness soil layer from top to bottom, and described
Mealiness soil layer or silty sand ground are locally accompanied in Muddy Bottoms stickiness soil layer；
The stratigraphy assemblage type of III type is followed successively by fill stratum, crust layer, Muddy Bottoms stickiness soil layer from top to bottom；Muddy Bottoms are glutinous
Property soil layer can be one or both of Muddy Bottoms silty clay, Muddy Bottoms clay combination, the Muddy Bottoms silty clay
Horizontal direction diffusion mobility easily occurs, the Muddy Bottoms clay has preferable buffer action to pollutant, and pollutant migrates downward into
To the layer, top will be gathered in.
The stratigraphy assemblage type of IV type be followed successively by from top to bottom fill stratum, crust layer, thick-layer it is plastic-hard plastic stickiness soil layer,
The thick-layer is plastic-and hard plastic stickiness the thickness of the layer is greater than 3m.
According to the division principle of above-mentioned stratigraphy assemblage type, the environmental hydrogeology of District of Shanghai or area grade region is drawn
Map section, various stratigraphy assemblage type are respectively provided with corresponding geographical position coordinates.
(2) stratigraphy assemblage type belonging to contaminated site is determined；Specifically determining method can have following two:
First method: the environmental hydrogeology situation data of contaminated site is consulted, to know its stratigraphy assemblage
Situation, so that it is determined that stratigraphy assemblage type belonging to the contaminated site；
Second method: according to the geographical position coordinates of contaminated site to be analyzed, pass through what is drawn in query steps (1)
Environmental hydrogeology map section determines stratigraphy assemblage type belonging to the contaminated site to be analyzed.
(3) the inside and outside river distribution situation of contaminated site, including three kinds of situations, equal nothing respectively inside and outside contaminated site are determined
There is river to be distributed outside river distribution, contaminated site, have river distribution in contaminated site；
(4) the stratigraphy assemblage type according to belonging to contaminated site and inside and outside river distribution situation, assess the Pollution Field
The diffusion mobility direction of ground presence of pollution sources and pollution depth, specific as follows:
[being directed to I type]
When the stratigraphy assemblage type of contaminated site be I type when, assess contaminated site presence of pollution sources diffusion mobility direction with
And the method for pollution depth are as follows:
If (a) contaminated site is inside and outside when being distributed without river, water level or flow are more stable in contaminated site, hydraulic gradient
Smaller, convection action and hydrodynamic dispersion effect are relatively less obvious during contaminant transportation, since Groundwater Flow is slow,
The effects of residence time is long, soil layer absorption, biodegrade is abundant, plays retarding effect to contaminant transportation, leads to migration circle
It is limited, therefore the diffusion mobility of pollutant in the horizontal direction can be ignored when being assessed；And in the depth direction, crust layer
Pollutant in distributed area is usually trapped at the top of crust layer, and crust layer lacks area, is moved under pollutant, but migration circle it is limited and
It is small compared with when having a river.
Therefore assessment result are as follows: pollution sources will be to depth direction diffusion mobility, and pollutant is finally stranded in the top of crust layer
Portion；If missing area is locally present in crust layer, the top for being stranded in Muddy Bottoms stickiness soil layer is moved under pollutant；
If (b) have river distribution outside contaminated site, fill stratum is higher to groundwater level fluctuation sensitivity, solute migration mistake
Convection action influences obvious in journey, secondly acts on for hydrodynamic dispersion；Crust layer poor permeability, convection current and mechanical dispersion effect
Weak, molecule disperse and suction-operated are stronger, therefore pollutant is usually trapped at the top of crust layer；Crust layer lacks area, under pollutant
It is big to move possibility, pollutant will finally be trapped in Muddy Bottoms stickiness soil layer soil top；Due to the good retardation of crust layer, firmly
The Groundwater Flow of shell and following soil layer is slow, and pollutant is caused to migrate under the conditions of different-thickness mealiness soil layer or silty sand ground
Range difference is unobvious.
Therefore assessment result are as follows: the horizontal direction to depth direction and direction or away from river is carried out migration expansion by pollution sources
It dissipates, and pollutant is finally stranded in the top of crust layer；If missing area is locally present in crust layer, moves and be stranded under pollutant
The top of Muddy Bottoms stickiness soil layer；If the groundwater level in contaminated site is higher than river level, pollution sources are directed toward river
Horizontal direction carry out diffusion mobility；If the groundwater level in contaminated site is lower than river level, pollution sources deviate from river
The horizontal direction of stream carries out diffusion mobility；
If (c) have river distribution in contaminated site, convection action influence has river point more outside the venue during solute migration
More obvious when cloth, pollution migration circle is bigger；Crust layer distributed area pollutant is usually trapped at the top of crust layer.Hard shell break
Area is lost, pollutes and is moved under solute, pollutant will be finally trapped at the top of the top of Muddy Bottoms stickiness soil layer, and migration circle has more outside the venue
It may be wider when river.
Therefore assessment result are as follows: the pollution sources in contaminated site will be to depth direction and direction or away from the level side in river
To diffusion mobility is carried out, pollution sources will improve migration on the basis of (b) when being directed toward or deviating from the diffusion mobility of river direction and expand
Area is dissipated, and pollutant is finally stranded in the top of crust layer；If missing area is locally present in crust layer, moved under pollutant stagnant
It stays in the top of Muddy Bottoms stickiness soil layer；If the groundwater level in contaminated site is higher than river level, pollution sources are directed toward
The horizontal direction in river carries out diffusion mobility；If the groundwater level in contaminated site is lower than river level, pollution sources back
Horizontal direction from river carries out diffusion mobility.
[being directed to II type]
When the stratigraphy assemblage type of contaminated site be II type when, assess contaminated site presence of pollution sources diffusion mobility direction with
And the method for pollution depth are as follows:
It is distributed without river if (a) contaminated site is inside and outside, when crust layer distribution is complete, rule is same as I type；Hard shell break
Area is lost, is moved under pollutant, but diffusion mobility is limited in scope, is moved under pollutant and is detained position at the top of Muddy Bottoms cohesive soil.
Therefore assessment result are as follows: pollution sources will be to depth direction diffusion mobility, and pollutant is finally stranded in the top of crust layer
Portion；If missing area is locally present in crust layer, the top for being stranded in Muddy Bottoms cohesive soil is moved under pollutant；
If (b) have river distribution outside contaminated site, fill stratum is higher to groundwater level fluctuation sensitivity, solute migration mistake
Convection action influences obvious in journey, secondly acts on for hydrodynamic dispersion；Each soil layer suction-operated is relatively strong, crust layer distributed area
Transport is same as I type.Crust layer lacks area, moves that possibility is big, and pollutant may be trapped in Muddy Bottoms cohesive soil under pollutant
Top.
Therefore assessment result are as follows: the pollution sources in contaminated site will be to depth direction and direction or away from the level side in river
To progress diffusion mobility, and pollutant is finally stranded in the top of crust layer；If missing area is locally present in crust layer, pollute
The top for being stranded in Muddy Bottoms cohesive soil is moved under object；If the groundwater level in contaminated site is higher than river level, pollute
The horizontal direction that river is directed toward in source carries out diffusion mobility；It is dirty if the groundwater level in contaminated site is lower than river level
Horizontal direction of the dye source away from river carries out diffusion mobility.
If (c) have river distribution in the contaminated site, there is convection action influence during contaminant transportation more outside the venue
River is more obvious when being distributed, and migration circle is bigger.Transport is same as I type substantially, only under crust layer missing area, pollutant
Moving delay position may be at the top of Muddy Bottoms stickiness soil layer.
Therefore assessment result are as follows: the pollution sources in contaminated site will be to depth direction and direction or far from the level side in river
To diffusion mobility is carried out, pollution sources will be improved on the basis of (b) when being directed toward or deviating from the diffusion mobility of river direction and be moved
Diffusion area is moved, and pollutant is finally stranded in the top of crust layer；If missing area is locally present in crust layer, under pollutant
Move the top for being stranded in Muddy Bottoms stickiness soil layer；It is dirty if the groundwater level in contaminated site is higher than the river level
The horizontal direction that the river is directed toward in dye source carries out diffusion mobility；If the groundwater level in contaminated site is lower than river level
When, then horizontal direction of the pollution sources away from river carries out diffusion mobility.
[being directed to III type]
When the stratigraphy assemblage type of contaminated site be III type when, assess contaminated site presence of pollution sources diffusion mobility direction with
And the method for pollution depth are as follows:
If (a) contaminated site is inside and outside when being distributed without river, water level or flow are more stable in contaminated site, hydraulic gradient
Smaller, convection action and hydrodynamic dispersion effect are relatively less obvious during contaminant transportation, since Groundwater Flow is slow,
The effects of residence time is long, soil layer absorption, biodegrade is abundant, plays retarding effect to contaminant transportation, leads to migration circle
It is limited, therefore the diffusion mobility of pollutant in the horizontal direction can be ignored when being assessed；And in the depth direction, crust layer
Distributed area pollutant is usually trapped at the top of crust layer, and crust layer lacks area, is moved under pollutant, but migration circle is limited and relatively has
Small when river, pollutant is usually stranded in the top of Muddy Bottoms stickiness soil layer.
Therefore assessment result are as follows: pollution sources will be to depth direction diffusion mobility, and pollutant is finally stranded in the top of crust layer
Portion；If missing area is locally present in crust layer, the top for being stranded in Muddy Bottoms stickiness soil layer is moved under pollutant.
If (b) have river distribution outside contaminated site, Groundwater Flow is slow, and contaminant transportation is limited in scope, and convection current is made
With weaker, each soil layer suction-operated is relatively strong, that is to say, that migration in the horizontal direction is negligible.Crust layer lacks area, dirty
It is moved under dye object but migration circle is limited, be usually trapped at the top of Muddy Bottoms stickiness soil layer.
Therefore assessment result are as follows: the pollution sources in contaminated site will carry out diffusion mobility to depth direction, and pollutant is final
It is stranded in the top of crust layer；If missing area is locally present in crust layer, is moved under pollutant and be stranded in Muddy Bottoms stickiness soil layer
Top.
If (c) have river distribution in contaminated site, Groundwater Flow is slow, and contaminant transportation is limited in scope, and convection current is made
With weaker, each soil layer suction-operated is relatively strong, that is to say, that migration in the horizontal direction is negligible.Crust layer lacks area, dirty
It is moved under dye object but migration circle is limited, be usually trapped at the top of Muddy Bottoms stickiness soil layer.
Therefore assessment result are as follows: the pollution sources in contaminated site will carry out diffusion mobility to depth direction, and pollutant is final
It is stranded in the top of crust layer；If missing area is locally present in crust layer, is moved under pollutant and be stranded in the Muddy Bottoms stickiness
The top of soil layer.
[being directed to IV type]
When the stratigraphy assemblage type of contaminated site be IV type when, assess contaminated site presence of pollution sources diffusion mobility direction with
And the method for pollution depth are as follows:
If (a) contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Object is finally stranded in the top of crust layer；If missing area is locally present in crust layer, is moved under pollutant and be stranded in plastic-hard plastic
The top of stickiness soil layer.
If (b) have river distribution outside contaminated site, the pollution sources in contaminated site will carry out migration expansion to depth direction
It dissipates, and pollutant is finally stranded in the top of crust layer；If missing area is locally present in crust layer, moves and be stranded under pollutant
Thick-layer is plastic-top of hard plastic stickiness soil layer.
If (c) have river distribution in contaminated site, the pollution sources in contaminated site will carry out migration expansion to depth direction
It dissipates, and pollutant is finally stranded in the top of crust layer；If missing area is locally present in crust layer, moves and be stranded under pollutant
Thick-layer is plastic-top of hard plastic stickiness soil layer.
It, can be tentatively pre- by the above-mentioned combination for stratigraphy assemblage type and inside and outside river distribution situation in contaminated site
Sentence the diffusion mobility situation of underground water pollution in contaminated site out, and contaminant transportation can be shown by way of three-dimensional diagram
The range of diffusion, the pollution control for after provide guidance and reference.
It should be noted that the appraisal procedure in the present embodiment further includes the steps that determining Dominated Factors, master control herein
Factor includes: particle composition and the content of organic matter and contaminated of soil layer permeability parameter, level of ground water nourishment condition, the soil body
Time, by above-mentioned Dominated Factors, to assess the diffusion mobility speed of pollution sources, and according to diffusion mobility evaluation of speed not
With the diffusion mobility area of period.
Embodiment 2: the present embodiment migrates appraisal procedure more particularly to a kind of underground water pollution, and combines Practical Project case
It is illustrated:
(1) the stratigraphy assemblage Type division rule of soft clay area is obtained；
(2) as shown in Figure 1, certain 1 occupied area of contaminated site about 29000m2, superficial part of the buried depth within 20m in place
Layer mainly by the 1. layer the 2. banket,1Layer silty clay, the are 2.3Layer clayey silt (local burning into sand) and the 4. layer silt clay
It is constituted Deng 4 soil layers.Wherein, 2.3Layer clayey silt is generally distributed, and thickness about 6-8m is conducive to contaminant transportation.That is,
Contaminated site 1 in the present embodiment belongs to the stratigraphy assemblage type of I type.
(3) after this, by reconnoitring discovery, the west of contaminated site 1, north, southern side are shallow in contaminated site 1 close to river 2
Portion's underground water is preservation in the diving of superficial part cohesive soil and mealiness soil layer, recharge of ground water periphery river 2.That is, this reality
The periphery for applying contaminated site in example is distributed with river 2, and the groundwater level in contaminated site 1 is higher than the water level in river 2.
(4) in the present embodiment, as shown in Figure 1, it is farmland and forest land that contaminated site 1 is most of, part is used as flight-line maintenance
And garbage transfer station, i.e. pollution sources are specifically flight-line maintenance region 4 and garbage transfer station 3.4 heap amplification quantity of flight-line maintenance region waits for
Maintenance equipment and waste household appliances, ground have patch shape machine oil spot, may result under pollutant seep cause it is petroleum hydrocarbon contaminated；Rubbish
Rubbish terminal 3 is still being runed, and the existing breakage of part terrace, and seeping under the landfill leachate of transport process may also can be to underground water
Pollution is generated, earth's surface river 2 becomes the potential receptor of 1 presence of pollution sources of contaminated site.According to stratigraphy assemblage belonging to contaminated site 1
2 distribution situation of type and inside and outside river assesses diffusion mobility direction and the pollution depth of 1 presence of pollution sources of contaminated site, tool
Body assessment result is as follows:
During to depth direction and, 1. layer bankets and 2. (A) pollution sources will1It is directed toward at the top of layer silty clay
The horizontal direction in river 2 carries out diffusion mobility, and 2. pollutant is finally stranded in the1The top of layer silty clay；
(B) as shown in Fig. 2, pollution sources about 50 days at garbage transfer station 3 can migrate to the earth's surface river outside the about 8m of west side
Stream 2, as shown in figure 3, the pollution sources in flight-line maintenance station region 4 i.e. can be to the earth's surface river 2 at the 45m of southern side after migration 1450 days
It pollutes；
(C) as time goes by, due to the eluviation of atmospheric precipitation and the immixture of underground water, the concentration of pollutant
It gradually decreases；
(D) by the following table 1 it is found that contamination range and its spreading rate not with the time at stringent proportionate relationship, with
The increase of contaminated area, pollution clouds diffusion rate is on a declining curve, this is because the friendship between polluter and water-bearing media
The effects of changing absorption, dilution and degradation is caused, and these effects constantly enhance with being gradually expanded for pollution clouds.
Table 1: contaminated site presence of pollution sources migration distance table
Claims (5)
1. a kind of underground water pollution migrates appraisal procedure, it is related to the contaminated site positioned at soft clay area, it is characterised in that institute's commentary
Estimate method the following steps are included:
(1) the environmental hydrogeology situation data of soft clay area superficial part soil layer is collected, and is I according to stratigraphy assemblage Type division
Type, II type, III type and IV type；
(2) stratigraphy assemblage type belonging to the contaminated site is determined；
(3) the inside and outside river distribution situation of the contaminated site, including three kinds of situations, equal nothing respectively inside and outside contaminated site are determined
There is river to be distributed outside river distribution, contaminated site, have river distribution in contaminated site；
(4) the stratigraphy assemblage type according to belonging to the contaminated site and inside and outside river distribution situation, assess the Pollution Field
The diffusion mobility direction of ground presence of pollution sources and pollution depth；
The stratigraphy assemblage type includes I type, II type, III type and IV type:
The stratigraphy assemblage type of I type is followed successively by fill stratum, crust layer, mealiness soil layer or silty sand ground, Muddy Bottoms from top to bottom
Stickiness soil layer；
The stratigraphy assemblage type of II type is followed successively by fill stratum, crust layer, Muddy Bottoms stickiness soil layer from top to bottom, and described
Mealiness soil layer or silty sand ground are locally accompanied in Muddy Bottoms stickiness soil layer；
The stratigraphy assemblage type of III type is followed successively by fill stratum, crust layer, Muddy Bottoms stickiness soil layer from top to bottom；
The stratigraphy assemblage type of IV type be followed successively by from top to bottom fill stratum, crust layer, thick-layer it is plastic-hard plastic stickiness soil layer,
The thick-layer is plastic-and hard plastic stickiness the thickness of the layer is greater than 3m；
When the stratigraphy assemblage type of contaminated site is I type, the diffusion mobility side of the contaminated site presence of pollution sources is assessed
To and pollution depth method are as follows:
If (a) contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Object is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer, moves and be stranded under pollutant
The top of the Muddy Bottoms stickiness soil layer；
If (b) have river distribution outside the contaminated site, pollution sources in the contaminated site to depth direction and will refer to
Diffusion mobility is carried out to or away from the horizontal direction in the river, and pollutant is finally stranded in the top of the crust layer；If
Missing area is locally present in the crust layer, then moves the top for being stranded in the Muddy Bottoms stickiness soil layer under pollutant；If described
When groundwater level in contaminated site is higher than the river level, then the pollution sources be directed toward the horizontal direction in the river into
Row diffusion mobility；If the groundwater level in the contaminated site is lower than the river level, the pollution sources deviate from institute
The horizontal direction for stating river carries out diffusion mobility；
If (c) have river distribution in the contaminated site, pollution sources in the contaminated site to depth direction and will refer to
To or away from the river horizontal direction carry out diffusion mobility, the pollution sources be directed toward or away from the river direction migrate
Diffusion mobility area will be improved when diffusion on the basis of (b), and pollutant is finally stranded in the top of the crust layer；
If missing area is locally present in the crust layer, the top for being stranded in the Muddy Bottoms stickiness soil layer is moved under pollutant；If institute
When stating the groundwater level in contaminated site higher than the river level, then the pollution sources are directed toward the horizontal direction in the river
Carry out diffusion mobility；If the groundwater level in the contaminated site is lower than the river level, the pollution sources deviate from
The horizontal direction in the river carries out diffusion mobility；
When the stratigraphy assemblage type of contaminated site is II type, the diffusion mobility side of the contaminated site presence of pollution sources is assessed
To and pollution depth method are as follows:
If (a) contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Object is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer, moves and be stranded under pollutant
The top of the Muddy Bottoms cohesive soil；
If (b) have river distribution outside the contaminated site, pollution sources in the contaminated site to depth direction and will refer to
Diffusion mobility is carried out to or away from the horizontal direction in the river, and pollutant is finally stranded in the top of the crust layer；If
Missing area is locally present in the crust layer, then moves the top for being stranded in the Muddy Bottoms cohesive soil under pollutant；If the dirt
When contaminating the groundwater level in place higher than the river level, then the horizontal direction that the pollution sources are directed toward the river carries out
Diffusion mobility；If the groundwater level in the contaminated site is lower than the river level, the pollution sources are away from described
The horizontal direction in river carries out diffusion mobility；
If (c) have river distribution in the contaminated site, pollution sources in the contaminated site to depth direction and will refer to
To or far from the river horizontal direction carry out diffusion mobility, the pollution sources be directed toward or away from the river direction migrate
Diffusion mobility area will be improved when diffusion on the basis of (b), and pollutant is finally stranded in the top of the crust layer；
If missing area is locally present in the crust layer, the top for being stranded in the Muddy Bottoms stickiness soil layer is moved under pollutant；If institute
When stating the groundwater level in contaminated site higher than the river level, then the pollution sources are directed toward the horizontal direction in the river
Carry out diffusion mobility；If the groundwater level in the contaminated site is lower than the river level, the pollution sources deviate from
The horizontal direction in the river carries out diffusion mobility；
When the stratigraphy assemblage type of contaminated site is III type, the diffusion mobility side of the contaminated site presence of pollution sources is assessed
To and pollution depth method are as follows:
If (a) contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Object is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer, moves and be stranded under pollutant
The top of the Muddy Bottoms stickiness soil layer；
If (b) have river distribution outside the contaminated site, the pollution sources in the contaminated site will be moved to depth direction
Diffusion is moved, and pollutant is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer, pollute
The top for being stranded in the Muddy Bottoms stickiness soil layer is moved under object；
If (c) have river distribution in the contaminated site, the pollution sources in the contaminated site will be moved to depth direction
Diffusion is moved, and pollutant is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer, pollute
The top for being stranded in the Muddy Bottoms stickiness soil layer is moved under object；
When the stratigraphy assemblage type of contaminated site is IV type, the diffusion mobility side of the contaminated site presence of pollution sources is assessed
To and pollution depth method are as follows:
If (a) contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Object is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer, moves and be stranded under pollutant
The top of the plastic-hard plastic stickiness soil layer；
If (b) have river distribution outside the contaminated site, the pollution sources in the contaminated site will be moved to depth direction
Diffusion is moved, and pollutant is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer, pollute
Moved under object be stranded in the thick-layer it is plastic-top of hard plastic stickiness soil layer；
If (c) have river distribution in the contaminated site, the pollution sources in the contaminated site will be moved to depth direction
Diffusion is moved, and pollutant is finally stranded in the top of the crust layer；If missing area is locally present in the crust layer, pollute
Moved under object be stranded in the thick-layer it is plastic-top of hard plastic stickiness soil layer.
2. a kind of underground water pollution according to claim 1 migrates appraisal procedure, it is characterised in that when the contaminated site
Stratigraphy assemblage type be pollution when having river distribution in or beyond I type and the contaminated site, in the contaminated site
Horizontal direction of the source by being directed toward in the fill stratum and at the top of the crust layer or away from the river carries out migration expansion
It dissipates.
3. a kind of underground water pollution according to claim 1 migrates appraisal procedure, it is characterised in that when the contaminated site
Stratigraphy assemblage type be pollution when having river distribution in or beyond II type and the contaminated site, in the contaminated site
Horizontal direction of the source by being directed toward in the fill stratum and at the top of the crust layer or away from the river carries out migration expansion
It dissipates.
4. a kind of underground water pollution according to claim 1 migrates appraisal procedure, it is characterised in that determine the Pollution Field
The method of stratigraphy assemblage type belonging to ground are as follows: each stratigraphy assemblage type is respectively provided in contrast in the soft clay area
The geographical position coordinates range answered；According to the geographical position coordinates value of the contaminated site, inquiry determines the contaminated site institute
Affiliated stratigraphy assemblage type in position.
5. a kind of underground water pollution according to claim 1 migrates appraisal procedure, it is characterised in that the appraisal procedure is also
Include the steps that determining Dominated Factors, the Dominated Factors include soil layer permeability parameter, level of ground water nourishment condition, the soil body
Particle composition and the content of organic matter and contaminated time, to assess the diffusion mobility speed of pollution sources.
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| CN111046521B (en) * | 2019-11-07 | 2023-07-18 | 上海勘察设计研究院(集团)有限公司 | Contaminated site investigation migration trend evaluation method |
| CN110794111A (en) * | 2019-12-18 | 2020-02-14 | 济南大学 | Method for analyzing migration and conversion rules of chlorinated hydrocarbon pollution in underground water |
| CN112417711B (en) * | 2020-12-25 | 2022-05-31 | 上海勘察设计研究院(集团)有限公司 | Pollutant migration analysis method based on polluted soil structure evolution |
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