CN103412104A - Method used for evaluating frangibility of underground water - Google Patents
Method used for evaluating frangibility of underground water Download PDFInfo
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Abstract
The invention discloses a method used for evaluating frangibility of underground water, and belongs to the field of environmental science and environmental risk. The method is capable of solving a problem that existing evaluation methods of frangibility of underground water are not suitable for the conditions of our country. A technical scheme of the invention comprises following steps: underground water type, frangibility evaluation indexes and parameters are obtained by hole drilling, empirical values or field pumping tests; a weight matrix is built based on the frangibility evaluation indexes, and objective weighted value of each frangibility evaluation index in the weight matrix is obtained respectively; independent evaluation result of each frangibility evaluation index in the weight matrix is obtain respectively; and an underground water frangibility evaluation map is obtained according to the objective weighted values and the independent evaluation results. The method can be used in underground water frangibility evaluation system.
Description
Technical field
The present invention relates to environmental science and environmental risk field, relate in particular to a kind of Groundwater Vulnerability Assessment Method.
Background technology
Groundwater resource are the grand strategy resources that support the sustainable development of socio-economy.Along with the Chinese society expanding economy, groundwater environment pressure increases gradually.But, groundwater management basis, the whole nation is quite weak, the basic environment situation is unclear, statutory standard construction hysteresis, supervisory system are left to be desired, and to China's socio-economic development, answer the water safety guarantee to constitute a serious threat, becomes the restraining factors of China's economy, society and harmonious development.
Carry out the Groundwater Vulnerability evaluation and be the most important basic measures of effectively protecting groundwater environment and carrying out the groundwater contamination prevention and control, its evaluation result chooses for the Groundwater seedbed and division of protection zones, groundwater contamination prevention and control scheme, the policy making of Land in Regional Land exploitation, municipal refuse are stacked Site Selection, the Ground water Quality Survey screen cloth is established all has important directive significance.
Yet, due to the Groundwater Vulnerability evaluation that the overlapped index method based on DRASTIC model or European model carries out, all be based on European Characteristics of Karst and set up, be not suitable for China.
Summary of the invention
Embodiments of the invention provide a kind of Groundwater Vulnerability Assessment Method, can be applicable to China's underground water.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of Groundwater Vulnerability Assessment Method comprises: obtain groundwater type, Evaluation of vulnerability index and parameter according to boring, empirical value or field bailing test; According to described Evaluation of vulnerability setup measures weight matrix, and obtain respectively the target weight value of each Evaluation of vulnerability index in described weight matrix; Obtain respectively the independent assessment result of each Evaluation of vulnerability index in described weight matrix; According to described target weight value and described independent assessment result, obtain the Groundwater Vulnerability evaluation map.
The Groundwater Vulnerability Assessment Method that the embodiment of the present invention provides, can be according to groundwater type, Evaluation of vulnerability index, determine target weight value and independent assessment result, thereby can obtain the Groundwater Vulnerability evaluation map according to target weight value and independent assessment result, realize the Groundwater Vulnerability evaluation.This technical scheme has solved the Groundwater Vulnerability evaluation of carrying out due to the overlapped index method based on DRASTIC model or European model in the prior art, all is based on European Characteristics of Karst and sets up, and is not suitable for the problem of China.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The process flow diagram of the Groundwater Vulnerability Assessment Method that Fig. 1 provides for the embodiment of the present invention one;
Fig. 2 obtains the process flow diagram of independent assessment result in Groundwater Vulnerability Assessment Method shown in Figure 1;
Fig. 3 obtains the process flow diagram of Groundwater Vulnerability evaluation map in Groundwater Vulnerability Assessment Method shown in Figure 1;
The process flow diagram of the Groundwater Vulnerability Assessment Method that Fig. 4 provides for the embodiment of the present invention two.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills obtain under the prerequisite of not making creative work every other embodiment, belong to the scope of protection of the invention.
For solving the evaluation of prior art Groundwater Vulnerability, be not suitable for the problem of China, the invention provides a kind of Groundwater Vulnerability Assessment Method.
Embodiment mono-:
As shown in Figure 1, the Groundwater Vulnerability Assessment Method that the embodiment of the present invention provides comprises:
In the present embodiment, groundwater type in step 101 can comprise: hole diving, hole piestic water or karst water; The Evaluation of vulnerability index can comprise: essential fragility index and/or special fragility index; Wherein, essential fragility index comprises: one or more in soil media, groundwater level depth, clean increment, aeration zone viscous soil horizon thickness, infiltration coefficient, water-bearing zone thickness and terrain slope; Special fragility index comprises: one or more in pollutant Transport And Transformation rule, drainage density, land use pattern and mining of groundwater degree.
Wherein, can obtain soil media, aeration zone viscous soil horizon thickness, water-bearing zone thickness etc. by bore mode; Can obtain infiltration coefficient etc. by empirical value or field bailing test, this is no longer going to repeat them.
In the present embodiment, the process of obtaining respectively the target weight value of each Evaluation of vulnerability index in weight matrix by step 102 can comprise: the matrix value that obtains weight matrix; According to matrix value, obtain corresponding weighted value; Weighted value is verified, be verified result; The result shows when checking is not passed through, and again obtains the matrix value of weight matrix, is verified until the result shows; The result shows while being verified, the weighted value be verified is made as to the target weight value.
Wherein, the matrix-valued process of obtaining weight matrix can comprise: the Evaluation of vulnerability index in weight matrix is compared in twos, obtain comparative result; According to comparative result, determine the matrix value of weight matrix.With bij, mean the importance of bi to bj, according to psychologist's result of study, the limit of the qualitative distinctive information grade of people is 7 ± 2.Therefore adopt 1~9 ratio scaling law as shown in table 1.Judgement Matrix has following character: bij > 0; Bij=1/bji; During i=j, bij=1.
Table 1 is passed judgment on rule
Can calculate eigenvalue of maximum characteristic of correspondence vector by judgment matrix, this proper vector be this level factor inferior with respect to last layer in the relative importance weights value of certain factor.Therefore, obtain corresponding weighted value according to matrix value, can comprise: according to weight matrix and matrix value Judgement Matricies; Calculate the product Mi of each row element of judgment matrix; Calculate the m th Root W ' of Mi
i, m is the line number of judgment matrix; According to W '
iObtain characteristic vector W, W=(W1, W2, W3 ..., Wm),
According to proper vector, obtain corresponding weighted value.Wherein,
(i, j=1,2,3 ..., m);
In the present embodiment, weighted value is verified, can be comprised: obtain the maximum characteristic root λ max of judgment matrix,
(PW) i means i the element of vectorial PW,
According to
Weighted value is verified, CR is that the random Consistency Ratio of judgment matrix: CI is the general coincident indicator of judgment matrix; RI is the mean random coincident indicator of judgment matrix.Wherein, RI can be provided by lot of experiments, and for the low order judgment matrix, the RI value is listed in table 2.
RI(1000 random result of table 2 mean random coincident indicator)
Exponent number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
RI | 0.00 | 0.00 | 0.58 | 0.90 | 1.12 | 1.24 | 1.32 | 1.41 | 1.45 | 1.49 |
For the judgment matrix higher than 12 rank, need to further consult reference materials or adopt approximation method.When exponent number≤2, matrix always has crash consistency; When exponent number was greater than 2, if CR<0.1, namely artificial judgment matrix had satisfied consistance, illustrated that it is rational that flexible strategy are distributed; Otherwise, just need to adjust judgment matrix, until obtain satisfied consistance.
In the present embodiment, geo-statistic analysis space method of interpolation is divided into the inverse distance weighted interpolation method, and in gram, golden method of interpolation etc., for the point-like vector data, as groundwater level depth, water-bearing zone thickness etc., carry out interpolation output grid categorical data to the point-like vector data.Raster data after interpolation is carried out to weight classification Ti, obtain the raster data of evaluation index weight classification Ti.Process flow diagram can be as shown in Figure 2.
In the present embodiment, can respectively each factor of independent assessment result be multiplied by weighted value, obtain the Groundwater Vulnerability evaluation map.After obtaining the Groundwater Vulnerability evaluation map, can by equivalent interval division, be 5 zones by it: fragility be hanged down district, fragility Jiao Di district, the medium district of fragility, fragility Jiao Gao district and the high district of fragility.Process flow diagram as shown in Figure 3.
In the present embodiment, the Groundwater Vulnerability evaluation system is divided into three modules: to guide module, model computation module, modelling verification module.
To guide module: the guiding user carries out the setting of a series of model environment parameters.Comprise newly-built, open and hold function.This can guide the user to select groundwater type to guide module; And due to underground moisture three classes, the Evaluation of vulnerability index difference that every class underground water is corresponding, therefore can arrange evaluation index corresponding to three pages; Can represent the index of having chosen according to the setting of Evaluation of vulnerability index, and hide unchecked index.
Model computation module: system core module, can carry out the calculating that arranges of the calculating of each evaluation index and weight, and weighted stacking is calculated.Concrete, establishing the Groundwater Environmental Vulnerability Evaluation Assessment standard has p opinion rating, total n reference mark in study area, the first level factor that each reference mark will be considered has m individual, each the first level factor have again Ki (i=1,2,3 ..., m) individual the second level factor.Can build three aggregated(particle) structure models layer by layer: destination layer (fragility)-restraint layer (one-level factor of evaluation)-indicator layer (secondary factor of evaluation).
The Groundwater Vulnerability Assessment Method that the embodiment of the present invention provides, can be according to groundwater type, Evaluation of vulnerability index, determine target weight value and independent assessment result, thereby can obtain the Groundwater Vulnerability evaluation map according to target weight value and independent assessment result, realize the Groundwater Vulnerability evaluation.This technical scheme has solved the Groundwater Vulnerability evaluation of carrying out due to the overlapped index method based on DRASTIC model or European model in the prior art, all is based on European Characteristics of Karst and sets up, and is not suitable for the problem of China.
Embodiment bis-:
As shown in Figure 4, the Groundwater Vulnerability Assessment Method that the embodiment of the present invention provides, the method is to shown in Figure 1 similar, and difference is, also comprises:
In the present embodiment, the process by step 104 is verified can comprise: verify according to single-factor pollution evaluation model; And/or verify according to the single-point comprehensive evaluation model; And/or verify according to tracer experiment.
Wherein, the process of verifying according to the single-factor contamination model comprises: obtain each single-point feature pollutant levels and corresponding Groundwater Vulnerability index in study area; Calculate the degree of correlation ρ of each single-point feature pollutant levels and corresponding Groundwater Vulnerability index, described
N means sample size; D representation feature pollutant levels seniority among brothers and sisters and Groundwater Vulnerability index seniority among brothers and sisters ranking are poor; According to described correlation of indices degree ρ, determine the rationality of estimating.Wherein, related coefficient is used for estimating the correlativity between two variable X, Y, and wherein the correlativity between variable can be described with monotonic quantity.If in two set of two variable-values, all there are not two identical elements, so, when one of them variable can be expressed as the good monotonic quantity of another variable (variation tendency of two variablees is identical), the ρ between two variablees can reach+and 1 or-1.The absolute value of correlation coefficient ρ is larger, and correlativity is stronger, and related coefficient is more close to 1 or-1, and the degree of correlation is stronger, and related coefficient is more close to 0, and the degree of correlation is more weak.The rationality of estimating can be as shown in table 3, during relevant or strong correlation, thinks that evaluation result is reasonable in both sides relation is.
Table 3 ρ grade classification
In the present embodiment, verify according to the single-point comprehensive evaluation model, can comprise: obtain single-factor pollution index I, described
The measured concentration of a certain component of Ci-, μ g/L or mg/L; The background value of this component of C0i-; According to default grade form, obtain the score value F that each single-factor pollution index I is corresponding; According to described score value F, carry out single-point comprehensive evaluation, obtain the feature pollutant degree of each single-point; Calculate feature pollutant degree and the Groundwater Vulnerability correlation of indices degree ρ of each single-point, described
N means sample size; D representation feature pollutant levels seniority among brothers and sisters and Groundwater Vulnerability index seniority among brothers and sisters ranking are poor;
According to described correlation of indices degree ρ, determine the rationality of estimating.
Groundwater contamination refers under the effect of human activity, and quality of groundwater is towards the phenomenon that worsens future development.As long as component concentration surpasses background value, all think and polluted.
When carrying out the groundwater environment pollution evaluation, first carry out the evaluation of single-point single-factor, then by the summation exponent method, carry out single-point comprehensive evaluation according to single-factor evaluation result (comprising inorganic single-factor evaluation and organic single-factor evaluation).Groundwater environment pollution evaluation inorganics adopts the underground water background value as estimating boundary value, and organism adopts groundwater quality to detect limit value as estimating boundary value.Single-point water pollution sorted table can be as shown in table 4.
Table 4 single-point water pollution sorted table
I≤1 | Uncontaminated | Do not surpass control value or background value |
1<I≤5 | The light pollution | It is control value or background value 1~5 times |
5<I≤10 | Middle pollution | Control value or background value 5~10 times |
10<I≤50 | Heavily contaminated | Control value or background value 10~50 times |
I>50 | Severe contamination | Be greater than control value or background value 50 times |
When if background value is interval value (mainly for inorganic pollutant), value, in interval, makes I=1, if I is greater than the maximal value of interval value, or while being less than the minimum value of interval value, respectively by maximal value or the minimum value of Ci value divided by interval value.
For the very doubt area of the background value of underground water, carry out when inorganic pollution is estimated using control value as reference.Definite foundation in principle analysis of data the earliest of control value, the groundwater quality control value series that the area many in data, that the research degree is higher is set up can be used as neighboring region's control value serial reference and uses; To lacking the area of groundwater quality data, can determine or process according to three class water quality standards in " groundwater quality standard " according to the supplementary survey data statistics without obvious pollution source position in this district.
In the present embodiment, default grade form can be as shown in table 5.
Table 5 single-point water pollution grade form
I | I≤1 | 1<I≤5 | 5<I≤10 | 10<I≤50 | I>50 |
F | 1 | 100 | 104 | 106 | 108 |
In the present embodiment, single-point comprehensive evaluation is by each single-point single-factor evaluation result summation, is shown below:
According to the PI value, the groundwater environment pollution level can be fallen into 5 types: uncontaminated (I level), micro-pollution (II level), light pollute (III level), than heavily contaminated (IV level) and severe contamination (V level) five grades (in Table 6).
The regional water pollution modified result of table 6 table
Process according to missing test is verified comprises: tracer agent is thrown at the place in two places, place of hydraulic connection to be verified, and another place receives described tracer agent; According to the tracer agent received, obtain and show the spike curve of time of arrival first; According to the symmetry of described spike curve, determine the rationality of estimating.
In the present embodiment, wanting to verify whether two places have the place of hydraulic connection, tracer agent is thrown at a place, and another place receives tracer agent.The tracer agent shown according to the spike curve is the waveform symmetry degree of time of arrival and spike curve first, illustrate whether two places exist underground pipeline, and hydraulic connection is verified the rationality of Evaluation of vulnerability figure.
In the present embodiment, can in the Groundwater Vulnerability evaluation system that embodiment mono-provides, increase the modelling verification module: single-point comprehensive evaluation groundwater environment pollution evaluation result is as the checking foundation, and tracer experiment.
The Groundwater Vulnerability Assessment Method that the embodiment of the present invention provides, can be according to groundwater type, Evaluation of vulnerability index, determine target weight value and independent assessment result, thereby can obtain the Groundwater Vulnerability evaluation map according to target weight value and independent assessment result, realize the Groundwater Vulnerability evaluation.This technical scheme has solved the Groundwater Vulnerability evaluation of carrying out due to the overlapped index method based on DRASTIC model or European model in the prior art, all is based on European Characteristics of Karst and sets up, and is not suitable for the problem of China.
The Groundwater Vulnerability Assessment Method that the embodiment of the present invention provides, can be applied in the Groundwater Vulnerability evaluation system.
Through the above description of the embodiments, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware, can certainly pass through hardware, but in a lot of situation, the former is better embodiment.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium can read, floppy disk as computing machine, hard disk or CD etc., comprise some instructions with so that computer equipment (can be personal computer, server, or the network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (11)
1. a Groundwater Vulnerability Assessment Method, is characterized in that, comprising:
According to boring, empirical value or field bailing test, obtain groundwater type, Evaluation of vulnerability index and parameter;
According to described Evaluation of vulnerability setup measures weight matrix, and obtain respectively the target weight value of each Evaluation of vulnerability index in described weight matrix;
Obtain respectively the independent assessment result of each Evaluation of vulnerability index in described weight matrix;
According to described target weight value and described independent assessment result, obtain the Groundwater Vulnerability evaluation map.
2. Groundwater Vulnerability Assessment Method according to claim 1, is characterized in that, described groundwater type comprises:
Hole diving, hole piestic water or karst water.
3. Groundwater Vulnerability Assessment Method according to claim 1, is characterized in that, described Evaluation of vulnerability index comprises: essential fragility index and/or special fragility index;
Described essential fragility index comprises: one or more in soil media, groundwater level depth, clean increment, aeration zone viscous soil horizon thickness, infiltration coefficient, water-bearing zone thickness and terrain slope;
Described special fragility index comprises: one or more in pollutant Transport And Transformation rule, drainage density, land use pattern and mining of groundwater degree.
4. Groundwater Vulnerability Assessment Method according to claim 1, is characterized in that, the described target weight value of not obtaining each Evaluation of vulnerability index in described weight matrix comprises:
Obtain the matrix value of described weight matrix;
According to described matrix value, obtain corresponding weighted value;
Described weighted value is verified, be verified result;
Described the result shows when checking is not passed through, and again obtains the matrix value of described weight matrix, is verified until the result shows;
Described the result shows while being verified, the described weighted value be verified is made as to described target weight value.
5. Groundwater Vulnerability Assessment Method according to claim 4, is characterized in that, the described matrix value that obtains described weight matrix comprises:
Evaluation of vulnerability index in described weight matrix is compared in twos, obtain comparative result;
According to described comparative result, determine the matrix value of described weight matrix.
6. Groundwater Vulnerability Assessment Method according to claim 4, is characterized in that, describedly according to described matrix value, obtains corresponding weighted value, comprising:
According to described weight matrix and matrix value Judgement Matricies;
Calculate the product Mi of described each row element of judgment matrix;
Calculate the m th Root W' of described Mi
i, described m is the line number of described judgment matrix;
According to described W'
iObtain characteristic vector W, described W=(W1, W2, W3 ..., Wm),
According to described proper vector, obtain corresponding weighted value.
7. Groundwater Vulnerability Assessment Method according to claim 6, is characterized in that, described described weighted value verified, comprising:
Obtain the maximum characteristic root λ max of described judgment matrix, described
Described (PW) i means i the element of vectorial PW,
According to
Described weighted value is verified, described CR is that the random Consistency Ratio of judgment matrix: CI is the general coincident indicator of judgment matrix; RI is the mean random coincident indicator of judgment matrix.
8. Groundwater Vulnerability Assessment Method according to claim 1, is characterized in that, described method also comprises:
According to single-factor pollution evaluation model, verify; And/or
According to the single-point comprehensive evaluation model, verify; And/or
According to tracer experiment, verify.
9. Groundwater Vulnerability Assessment Method according to claim 8, is characterized in that, describedly according to single-factor pollution evaluation model, verifies, comprising:
Obtain each single-point feature pollutant levels and corresponding Groundwater Vulnerability index in study area;
Calculate the degree of correlation ρ of each single-point feature pollutant levels and corresponding Groundwater Vulnerability index, described
N means sample size; D representation feature pollutant levels seniority among brothers and sisters and Groundwater Vulnerability index seniority among brothers and sisters ranking are poor;
According to described correlation of indices degree ρ, determine the rationality of estimating.
10. Groundwater Vulnerability Assessment Method according to claim 8, is characterized in that, describedly according to the single-point comprehensive evaluation model, verifies, comprising:
Obtain single-factor pollution index I, described
The measured concentration of a certain component of Ci-, μ g/L or mg/L; The background value of this component of C0i-;
According to default grade form, obtain the score value F that each single-factor pollution index I is corresponding;
According to described score value F, carry out single-point comprehensive evaluation, obtain the feature pollutant degree of each single-point;
Calculate feature pollutant degree and the Groundwater Vulnerability correlation of indices degree ρ of each single-point, described
N means sample size; D representation feature pollutant levels seniority among brothers and sisters and Groundwater Vulnerability index seniority among brothers and sisters ranking are poor;
According to described correlation of indices degree ρ, determine the rationality of estimating.
11. Groundwater Vulnerability Assessment Method according to claim 8, is characterized in that, describedly according to tracer experiment, verifies, comprising:
Tracer agent is thrown at a place in two places, place of hydraulic connection to be verified, and another place receives described tracer agent;
According to the tracer agent received, obtain and show the spike curve of time of arrival first;
According to the symmetry of described spike curve, determine the rationality of estimating.
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