CN107761693A - A kind of underground water pollution migrates appraisal procedure - Google Patents
A kind of underground water pollution migrates appraisal procedure Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 47
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- 239000003344 environmental pollutant Substances 0.000 claims abstract description 85
- 231100000719 pollutant Toxicity 0.000 claims abstract description 85
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- 238000013508 migration Methods 0.000 claims abstract description 42
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Abstract
The invention discloses a kind of underground water pollution to migrate appraisal procedure, is related to the contaminated site positioned at soft clay area, comprises the following steps：（1）The environmental hydrogeology situation data of soft clay area superficial part soil layer is collected, and is I type, II type, III type and IV type according to stratigraphy assemblage Type division；（2）Determine the stratigraphy assemblage type belonging to the contaminated site；（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）Stratigraphy assemblage type and inside and outside river distribution situation according to belonging to the contaminated site, assess diffusion mobility direction and the pollution depth of the contaminated site presence of pollution sources.It is an advantage of the invention that：The foundation of the appraisal procedure effectively improves the recognition efficiency of underground water pollution migration, meaningful to fully the spatial distribution scope of assurance pollutant and its development trend.
Description
Technical field
The invention belongs to environmental geotechnical technical field, and in particular to a kind of underground water pollution migrates appraisal procedure.
Background technology
Groundwater resources are the grand strategy resources for supporting social sustainable development, and China's groundwater resources amount accounts for 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 getting worse, underground water pollution public hazard incident take place frequently and cause to seriously endanger, and there is an urgent need to carry out underground water pollution reparation
Administer.
The basic premise for implementing underground water pollution control is the abundant sky for holding pollutant in soil and groundwater environment
Between distribution characteristics.The basis of representative points position pollution condition can obtained by the technological means such as quick detection or sampling chemical examination
The current spatial distribution situation of upper analysis pollutant.But the data volume obtained by inquiry is limited, contaminant transportation can not be obtained
The important information such as the historical process of change and future developing trend.Therefore a kind of underground water pollution migration appraisal procedure is needed to make up
These deficiencies.
The content 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 procedure, this is commented
Estimate method the stratigraphy assemblage of soft clay area is classified in advance, so that technical staff need to only obtain the affiliated stratum of contaminated site
In the case that composite type and inside and outside river are distributed, you can to the groundwater pollutant in contaminated site in the horizontal direction with
And the diffusion mobility scope on depth direction carries out a preliminary assessment.
The object of the invention is realized and completed by following technical scheme：
A kind of underground water pollution migrates appraisal procedure, is related to the contaminated site positioned at soft clay area, it is characterised in that the assessment
Method comprises the following steps：
（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）Determine the stratigraphy assemblage type belonging to the contaminated site；
（3）Determine the inside and outside river distribution situation of the contaminated site, including three kinds of situations, equal nothing respectively inside and outside contaminated site
There is river to be distributed outside river distribution, contaminated site, have river distribution in contaminated site；
（4）Stratigraphy assemblage type and inside and outside river distribution situation according to belonging to the contaminated site, 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 more 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
The method for dissipating direction and pollution depth is：
（a）If the contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Thing is finally stranded in the top of the crust layer；If locally lying in missing area in the crust layer, move and be stranded under pollutant
The top of the Muddy Bottoms stickiness soil layer；
（b）If 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 lain in the crust layer, then the top for being stranded in the Muddy Bottoms stickiness soil layer is moved under pollutant；It is if described
When groundwater level in contaminated site is higher than the river level, then the horizontal direction in the pollution sources sensing river is entered
Row diffusion mobility；If the groundwater level in the contaminated site is less than the river level, the pollution sources deviate from institute
The horizontal direction for stating river carries out diffusion mobility；
（c）If 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 point to or away from the river direction migrate
Will be described during diffusion（b）On the basis of improve diffusion mobility area, and pollutant is finally stranded in the top of the crust layer；
If locally lying in missing area 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 and being higher than the river level, then the pollution sources point to the horizontal direction in the river
Carry out diffusion mobility；If the groundwater level in the contaminated site is less 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 migration for assessing the contaminated site presence of pollution sources is expanded
The method for dissipating direction and pollution depth is：
（a）If the contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Thing is finally stranded in the top of the crust layer；If locally lying in missing area in the crust layer, move and be stranded under pollutant
The top of the Muddy Bottoms cohesive soil；
（b）If 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 lain in the crust layer, then the top for being stranded in the Muddy Bottoms cohesive soil is moved under pollutant；If the dirt
When groundwater level in dye place is higher than the river level, then the pollution sources point to the horizontal direction progress in the river
Diffusion mobility；If the groundwater level in the contaminated site is less than the river level, the pollution sources are away from described
The horizontal direction in river carries out diffusion mobility；
（c）If 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 point to or away from the river direction migrate
Will be described during diffusion（b）On the basis of improve diffusion mobility area, and pollutant is finally stranded in the top of the crust layer；
If locally lying in missing area 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 and being higher than the river level, then the pollution sources point to the horizontal direction in the river
Carry out diffusion mobility；If the groundwater level in the contaminated site is less 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 the method for pollution depth be：
（a）If the contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Thing is finally stranded in the top of the crust layer；If locally lying in missing area in the crust layer, move and be stranded under pollutant
The top of the Muddy Bottoms stickiness soil layer；
（b）If 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 locally lying in missing area in the crust layer, pollute
The top for being stranded in the Muddy Bottoms stickiness soil layer is moved under thing；
（c）If 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 locally lying in missing area in the crust layer, pollute
The top for being stranded in the Muddy Bottoms stickiness soil layer is moved under thing.
When the stratigraphy assemblage type of contaminated site is IV type, the migration for assessing the contaminated site presence of pollution sources is expanded
The method for dissipating direction and pollution depth is：
（a）If the contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Thing is finally stranded in the top of the crust layer；If locally lying in missing area in the crust layer, move and be stranded under pollutant
The top of the plastic-hard plastic stickiness soil layer；
（b）If 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 locally lying in missing area in the crust layer, pollute
Moved under thing be stranded in the thick-layer it is plastic-top of hard plastic stickiness soil layer；
（c）If 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 locally lying in missing area in the crust layer, pollute
Moved under thing 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 point to or away 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 point to or away from the river
The horizontal direction of stream carries out diffusion mobility.
The method for determining the stratigraphy assemblage type belonging to the contaminated site is：Each stratum group in the soft clay area
Close type has corresponding geographical position coordinates scope respectively；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 also include determine Dominated Factors the step of, 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, so as to assess moving for pollution sources
Move diffusion velocity.
It is an advantage of the invention that：The appraisal procedure is simple and quick, can be inside and outside based on stratigraphy assemblage type, contaminated site
River is distributed and Dominated Factors are fixed really, and quickly carrying out preliminary estimating to the underground water pollution in contaminated site sentences
It is disconnected, the recognition efficiency of underground water pollution migration is effectively improved, spatial distribution scope and its development to fully holding pollutant
Trend is meaningful.
Brief description of the drawings
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.
Embodiment
The feature of the present invention and other correlated characteristics are described in further detail by embodiment below in conjunction with accompanying drawing, with
It is easy to the understanding of technical staff of the same trade：
Such as Fig. 1-3, mark 1-4 is respectively in figure：Contaminated site 1, river 2, garbage transfer station 3, flight-line maintenance region 4.
Embodiment 1：The present embodiment specifically includes more particularly to a kind of underground water pollution migration appraisal procedure, the appraisal procedure
Following steps：
（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, the soft clay area in the present embodiment can be collected according to administrative division, e.g. county,
In the range of city, province, soft clay area selection is the shallow stratum in the range of 20 meters of Shanghai City area below ground in the present embodiment；
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 stickiness from top to bottom
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 in the mud
Mealiness soil layer or silty sand ground are locally accompanied in matter 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 cohesive soil
Layer can be the combination of one or both of Muddy Bottoms silty clay, Muddy Bottoms clay, and described Muddy Bottoms silty clay is easily sent out
Unboiled water is put down to diffusion mobility, described Muddy Bottoms clay, has preferable buffer action to pollutant, pollutant migrates downward into this
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 more than 3m.
According to the division principle of above-mentioned stratigraphy assemblage type, the environmental hydrogeology in drafting District of Shanghai or area level region
Map section, various stratigraphy assemblage type have corresponding geographical position coordinates respectively.
（2）Determine the stratigraphy assemblage type belonging to contaminated site；The method specifically determined 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 the stratigraphy assemblage type belonging to the contaminated site；
Second method：According to the geographical position coordinates of contaminated site to be analyzed, pass through query steps（1）Middle drawn environment
Hydrogeological province map, determine the stratigraphy assemblage type belonging to the contaminated site to be analyzed.
（3）Determine the inside and outside river distribution situation of contaminated site, including three kinds of situations, equal nothing respectively inside and outside contaminated site
There is river to be distributed outside river distribution, contaminated site, have river distribution in contaminated site；
（4）Stratigraphy assemblage type and inside and outside river distribution situation according to belonging to contaminated site, are assessed in the contaminated site
The diffusion mobility direction of pollution sources and pollution depth, it is specific as follows：
【For I type】
When the stratigraphy assemblage type of contaminated site is I type, diffusion mobility direction and the dirt of contaminated site presence of pollution sources are assessed
Dye depth method be：
（a）If contaminated site is inside and outside when being distributed without river, water level or flow are relatively stable in contaminated site, and hydraulic gradient is smaller,
Convection action and hydrodynamic dispersion effect are relatively less obvious during contaminant transportation, because Groundwater Flow is slow, are detained
Time is grown, and the effect such as soil layer absorption, biodegradation is abundant, plays retarding effect to contaminant transportation, causes migration circle limited,
Therefore the diffusion mobility of pollutant in the horizontal direction can be neglected when being assessed；And in the depth direction, crust layer distribution
Pollutant in area is generally trapped at the top of crust layer, crust layer missing area, is moved under pollutant, but migration circle is limited and relatively has
It is small during river.
Therefore assessment result is：Pollution sources will be to depth direction diffusion mobility, and pollutant is finally stranded in the top of crust layer
Portion；If locally lying in missing area in crust layer, the top for being stranded in Muddy Bottoms stickiness soil layer is moved under pollutant；
（b）If have river distribution outside contaminated site, fill stratum is higher to groundwater level fluctuation sensitivity, during solute migration
Convection action influences substantially, secondly to act on for hydrodynamic dispersion；Crust layer poor permeability, convection current and mechanical dispersion effect are weak, point
Sub- disperse and suction-operated are stronger, therefore pollutant is generally trapped at the top of crust layer；Crust layer lacks area, and possibility is moved under pollutant
Property it is big, pollutant be most trapped at last Muddy Bottoms stickiness soil layer soil top；Due to the good retardation of crust layer, crust layer and
The Groundwater Flow of following soil layer is slow, causes pollutant migration circle under the conditions of different-thickness mealiness soil layer or silty sand ground poor
Other unobvious.
Therefore assessment result is：Horizontal direction to depth direction and sensing or away from river is carried out migration expansion by pollution sources
Dissipate, and pollutant is finally stranded in the top of crust layer；If locally lying in missing area in crust layer, move 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 point to river
Horizontal direction carry out diffusion mobility；If the groundwater level in contaminated site is less than river level, pollution sources deviate from river
The horizontal direction of stream carries out diffusion mobility；
（c）If have river distribution in contaminated site, when convection action influences to have river distribution more outside the venue during solute migration
More obvious, pollution migration circle is bigger；Crust layer distributed area pollutant is generally trapped at the top of crust layer.Crust layer lacks
Area, pollute and moved under solute, pollutant is most trapped at the top of the top of Muddy Bottoms stickiness soil layer at last, and migration circle has river more outside the venue
May be wider during stream.
Therefore assessment result is：Pollution sources in contaminated site are by depth direction and sensing or away from the level side in river
To carrying out diffusion mobility, pollution sources are pointing to or will be during away from the diffusion mobility of river direction（b）On the basis of improve migration expand
Area is dissipated, and pollutant is finally stranded in the top of crust layer；If locally lying in missing area in crust layer, moved under pollutant stagnant
Stay in the top of Muddy Bottoms stickiness soil layer；If the groundwater level in contaminated site is higher than river level, pollution sources point to
The horizontal direction in river carries out diffusion mobility；If the groundwater level in contaminated site is less than river level, the pollution sources back of the body
Horizontal direction from river carries out diffusion mobility.
【For II type】
When the stratigraphy assemblage type of contaminated site is II type, diffusion mobility direction and the dirt of contaminated site presence of pollution sources are assessed
Dye depth method be：
（a）It is distributed if contaminated site is inside and outside without river, when crust layer distribution is complete, rule is same as I type；Crust layer lacks area,
Moved under pollutant, but diffusion mobility is limited in scope, and is moved under pollutant and is detained position at the top of Muddy Bottoms cohesive soil.
Therefore assessment result is：Pollution sources will be to depth direction diffusion mobility, and pollutant is finally stranded in the top of crust layer
Portion；If locally lying in missing area in crust layer, the top for being stranded in Muddy Bottoms cohesive soil is moved under pollutant；
（b）If have river distribution outside contaminated site, fill stratum is higher to groundwater level fluctuation sensitivity, during solute migration
Convection action influences substantially, secondly to act on for hydrodynamic dispersion；Each soil layer suction-operated is relatively strong, the migration in crust layer distributed area
Rule is same as I type.Crust layer lacks area, moves that possibility is big under pollutant, and pollutant may be trapped in the top of Muddy Bottoms cohesive soil
Portion.
Therefore assessment result is：Pollution sources in contaminated site are by depth direction and sensing or away from the level side in river
To progress diffusion mobility, and pollutant is finally stranded in the top of crust layer；If locally lying in missing area in crust layer, pollute
The top for being stranded in Muddy Bottoms cohesive soil is moved under thing；If the groundwater level in contaminated site is higher than river level, pollute
The horizontal direction that river is pointed in source carries out diffusion mobility；It is dirty if the groundwater level in contaminated site is less than river level
Horizontal direction of the dye source away from river carries out diffusion mobility.
（c）If have river distribution in the contaminated site, convection action influences to have more outside the venue during contaminant transportation
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 is：Pollution sources in contaminated site are by depth direction and sensing or the level side away from river
To diffusion mobility is carried out, pollution sources will be described when pointing to or away from the diffusion mobility of river direction（b）On the basis of improve and move
Diffusion area is moved, and pollutant is finally stranded in the top of crust layer；If locally lying in missing area 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 pointed in dye source carries out diffusion mobility；If the groundwater level in contaminated site is less than river level
When, then horizontal direction of the pollution sources away from river carries out diffusion mobility.
【For III type】
When the stratigraphy assemblage type of contaminated site is III type, diffusion mobility direction and the dirt of contaminated site presence of pollution sources are assessed
Dye depth method be：
（a）If contaminated site is inside and outside when being distributed without river, water level or flow are relatively stable in contaminated site, and hydraulic gradient is smaller,
Convection action and hydrodynamic dispersion effect are relatively less obvious during contaminant transportation, because Groundwater Flow is slow, are detained
Time is grown, and the effect such as soil layer absorption, biodegradation is abundant, plays retarding effect to contaminant transportation, causes migration circle limited,
Therefore the diffusion mobility of pollutant in the horizontal direction can be neglected when being assessed；And in the depth direction, crust layer distribution
Area's pollutant is generally trapped at the top of crust layer, crust layer missing area, is moved under pollutant, but migration circle is limited and relatively has river
When it is small, pollutant is generally stranded in the top of Muddy Bottoms stickiness soil layer.
Therefore assessment result is：Pollution sources will be to depth direction diffusion mobility, and pollutant is finally stranded in the top of crust layer
Portion；If locally lying in missing area in crust layer, the top for being stranded in Muddy Bottoms stickiness soil layer is moved under pollutant.
（b）If 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 stronger, that is to say, that migration in the horizontal direction can be neglected.Crust layer lacks area, dirty
Moved under dye thing but migration circle is limited, be generally trapped at the top of Muddy Bottoms stickiness soil layer.
Therefore assessment result is：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 locally lying in missing area in crust layer, moved under pollutant and be stranded in Muddy Bottoms stickiness soil layer
Top.
（c）If 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 stronger, that is to say, that migration in the horizontal direction can be neglected.Crust layer lacks area, dirty
Moved under dye thing but migration circle is limited, be generally trapped at the top of Muddy Bottoms stickiness soil layer.
Therefore assessment result is：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 locally lying in missing area in crust layer, moved under pollutant and be stranded in the Muddy Bottoms stickiness
The top of soil layer.
【For IV type】
When the stratigraphy assemblage type of contaminated site is IV type, diffusion mobility direction and the dirt of contaminated site presence of pollution sources are assessed
Dye depth method be：
（a）If contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutant is most
The top of crust layer is stranded in eventually；If locally lying in missing area in crust layer, moved under pollutant and be stranded in plastic-hard plastic stickiness
The top of soil layer.
（b）If have river distribution outside contaminated site, the pollution sources in contaminated site will carry out migration expansion to depth direction
Dissipate, and pollutant is finally stranded in the top of crust layer；If locally lying in missing area in crust layer, move and be stranded under pollutant
Thick-layer is plastic-top of hard plastic stickiness soil layer.
（c）If have river distribution in contaminated site, the pollution sources in contaminated site will carry out migration expansion to depth direction
Dissipate, and pollutant is finally stranded in the top of crust layer；If locally lying in missing area in crust layer, move and be stranded under pollutant
Thick-layer is plastic-top of hard plastic stickiness soil layer.
, 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 for underground water pollution in contaminated site, and contaminant transportation can be shown by way of three-dimensional illustrates
The scope of diffusion, the pollution control for after provide guidance and reference.
It should be noted that the step of appraisal procedure in the present embodiment also includes determining Dominated Factors, master control herein
Factor includes：Soil layer permeability parameter, level of ground water nourishment condition, particle composition and the content of organic matter and contaminated of the soil body
Time, by above-mentioned Dominated Factors, so as 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 combines Practical Project case more particularly to a kind of underground water pollution migration appraisal procedure
Illustrate：
（1）Obtain the stratigraphy assemblage Type division rule of soft clay area；
（2）As shown in figure 1, certain floor space of contaminated site 1 about 29000m2, shallow stratum master of the buried depth within 20m in place
Will by 1. layer 2. banket,1Layer silty clay, the are 2.3Layer clayey silt（Local burning into sand）With 4. layer silt clay etc. 4
Individual soil layer is formed.Wherein, 2.3Layer clayey silt is generally distributed, thickness about 6-8m, beneficial to contaminant transportation.That is, this reality
Apply the stratigraphy assemblage type that the contaminated site 1 in example belongs to I type.
（3）After this, found by reconnoitring, 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 superficial part cohesive soil and the diving of mealiness soil layer, recharge of ground water periphery river 2.That is, this reality
Applying the periphery of contaminated site in example, there is river 2 to be distributed, 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.The heap amplification quantity of flight-line maintenance region 4 is treated
Maintenance equipment and waste household appliances, ground have patch shape machine oil spot, may result in oozed under pollutant cause it is petroleum hydrocarbon contaminated；Rubbish
Rubbish terminal 3 is still being runed, and the existing breakage of part terrace, and being oozed under the percolate of transport process may also can be to underground water
Pollution is produced, earth's surface river 2 turns into the potential acceptor of the presence of pollution sources of contaminated site 1.According to the stratigraphy assemblage belonging to contaminated site 1
Type and the distribution situation of inside and outside river 2, assess diffusion mobility direction and the pollution depth of the presence of pollution sources of contaminated site 1, tool
Body assessment result is as follows：
（A）During to depth direction and, 1. layer bankets and 2. pollution sources will1River 2 is pointed at the top of layer silty clay
Horizontal direction carry out diffusion mobility, and 2. pollutant is finally stranded in the1The top of layer silty clay；
（B）As shown in Fig. 2 the pollution sources at garbage transfer station 3 can migrate to earth's surface river 2 of the west side about outside 8m in about 50 days,
As shown in figure 3, the pollution sources in flight-line maintenance station region 4 can cause after migrating 1450 days to the earth's surface river 2 at the 45m of southern side
Pollution；
（C）Elapse over time, because the eluviation of atmospheric precipitation and the immixture of underground water, the concentration of pollutant are gradual
Reduce；
（D）From table 1 below, contamination scope and its spreading rate are not into strict proportionate relationship, with dirt with the time
The increase of area is contaminated, pollution clouds diffusion rate is on a declining curve, and this is due to exchange suction between polluter and water-bearing media
Caused by the effect such as attached, dilution and degraded, and these effects constantly strengthen with the gradual expansion of pollution clouds.
Table 1：Contaminated site presence of pollution sources migration distance table
Claims (10)
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
The method of estimating comprises the following steps：
（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）Determine the stratigraphy assemblage type belonging to the contaminated site；
（3）Determine the inside and outside river distribution situation of the contaminated site, including three kinds of situations, equal nothing respectively inside and outside contaminated site
There is river to be distributed outside river distribution, contaminated site, have river distribution in contaminated site；
（4）Stratigraphy assemblage type and inside and outside river distribution situation according to belonging to the contaminated site, assess the Pollution Field
The diffusion mobility direction of ground presence of pollution sources and pollution depth.
A kind of 2. underground water pollution migration appraisal procedure according to claim 1, it is characterised in that the stratigraphy assemblage class
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 more than 3m.
3. a kind of underground water pollution migration appraisal procedure according to claim 2, it is characterised in that when the ground of contaminated site
When layer composite type is I type, the diffusion mobility direction of the contaminated site presence of pollution sources and the side of pollution depth are assessed
Method is：
（a）If the contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Thing is finally stranded in the top of the crust layer；If locally lying in missing area in the crust layer, move and be stranded under pollutant
The top of the Muddy Bottoms stickiness soil layer；
（b）If 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 lain in the crust layer, then the top for being stranded in the Muddy Bottoms stickiness soil layer is moved under pollutant；It is if described
When groundwater level in contaminated site is higher than the river level, then the horizontal direction in the pollution sources sensing river is entered
Row diffusion mobility；If the groundwater level in the contaminated site is less than the river level, the pollution sources deviate from institute
The horizontal direction for stating river carries out diffusion mobility；
（c）If 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 point to or away from the river direction migrate
Will be described during diffusion（b）On the basis of improve diffusion mobility area, and pollutant is finally stranded in the top of the crust layer；
If locally lying in missing area 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 and being higher than the river level, then the pollution sources point to the horizontal direction in the river
Carry out diffusion mobility；If the groundwater level in the contaminated site is less than the river level, the pollution sources deviate from
The horizontal direction in the river carries out diffusion mobility.
4. a kind of underground water pollution migration appraisal procedure according to claim 2, it is characterised in that when the ground of contaminated site
When layer composite type is II type, the diffusion mobility direction of the contaminated site presence of pollution sources and the side of pollution depth are assessed
Method is：
（a）If the contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Thing is finally stranded in the top of the crust layer；If locally lying in missing area in the crust layer, move and be stranded under pollutant
The top of the Muddy Bottoms cohesive soil；
（b）If 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 lain in the crust layer, then the top for being stranded in the Muddy Bottoms cohesive soil is moved under pollutant；If the dirt
When groundwater level in dye place is higher than the river level, then the pollution sources point to the horizontal direction progress in the river
Diffusion mobility；If the groundwater level in the contaminated site is less than the river level, the pollution sources are away from described
The horizontal direction in river carries out diffusion mobility；
（c）If 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 point to or away from the river direction migrate
Will be described during diffusion（b）On the basis of improve diffusion mobility area, and pollutant is finally stranded in the top of the crust layer；
If locally lying in missing area 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 and being higher than the river level, then the pollution sources point to the horizontal direction in the river
Carry out diffusion mobility；If the groundwater level in the contaminated site is less than the river level, the pollution sources deviate from
The horizontal direction in the river carries out diffusion mobility.
5. a kind of underground water pollution migration appraisal procedure according to claim 2, it is characterised in that when the ground of contaminated site
When layer composite type is III type, the diffusion mobility direction of the contaminated site presence of pollution sources and the side of pollution depth are assessed
Method is：
（a）If the contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Thing is finally stranded in the top of the crust layer；If locally lying in missing area in the crust layer, move and be stranded under pollutant
The top of the Muddy Bottoms stickiness soil layer；
（b）If 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 locally lying in missing area in the crust layer, pollute
The top for being stranded in the Muddy Bottoms stickiness soil layer is moved under thing；
（c）If 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 locally lying in missing area in the crust layer, pollute
The top for being stranded in the Muddy Bottoms stickiness soil layer is moved under thing.
6. a kind of underground water pollution migration appraisal procedure according to claim 2, it is characterised in that when the ground of contaminated site
When layer composite type is IV type, the diffusion mobility direction of the contaminated site presence of pollution sources and the side of pollution depth are assessed
Method is：
（a）If the contaminated site is inside and outside when being distributed without river, pollution sources will be to depth direction diffusion mobility, and pollutes
Thing is finally stranded in the top of the crust layer；If locally lying in missing area in the crust layer, move and be stranded under pollutant
The top of the plastic-hard plastic stickiness soil layer；
（b）If 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 locally lying in missing area in the crust layer, pollute
Moved under thing be stranded in the thick-layer it is plastic-top of hard plastic stickiness soil layer；
（c）If 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 locally lying in missing area in the crust layer, pollute
Moved under thing be stranded in the thick-layer it is plastic-top of hard plastic stickiness soil layer.
7. a kind of underground water pollution migration appraisal procedure according to claim 3, it is characterised in that when the contaminated site
Stratigraphy assemblage type to have river distribution in or beyond I type and the contaminated site when, the pollution in the contaminated site
Horizontal direction of the source by pointing in the fill stratum and at the top of the crust layer or away from the river carries out migration expansion
Dissipate.
8. a kind of underground water pollution migration appraisal procedure according to claim 4, it is characterised in that when the contaminated site
Stratigraphy assemblage type to have river distribution in or beyond II type and the contaminated site when, the pollution in the contaminated site
Horizontal direction of the source by pointing in the fill stratum and at the top of the crust layer or away from the river carries out migration expansion
Dissipate.
9. a kind of underground water pollution migration appraisal procedure according to claim 1, it is characterised in that determine the Pollution Field
The method of stratigraphy assemblage type belonging to ground is：Each stratigraphy assemblage type has in contrast respectively in the soft clay area
The geographical position coordinates scope answered；According to the geographical position coordinates value of the contaminated site, inquiry determines the contaminated site institute
Affiliated stratigraphy assemblage type in position.
10. a kind of underground water pollution migration appraisal procedure according to claim 1, it is characterised in that the appraisal procedure is also
The step of including determining Dominated Factors, the Dominated Factors include soil layer permeability parameter, level of ground water nourishment condition, the soil body
Particle forms and the content of organic matter and contaminated time, so as to assess the diffusion mobility speed of pollution sources.
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