CN112946029B - System and method for delineating pollution plume using total solids profile of borehole groundwater solubility - Google Patents
System and method for delineating pollution plume using total solids profile of borehole groundwater solubility Download PDFInfo
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Abstract
The invention discloses a system and a method for delineating pollution plume by using a total solid profile of solubility of drilling underground water. The full-filter-tube drilling well pipe comprises a full-filter-tube drilling well pipe penetrating underground water pollution feathers and a conductivity meter, wherein the full-filter-tube drilling well pipe is inserted into a water permeability uniform layer, the bottom end of the full-filter-tube drilling well pipe is sleeved with a well pipe bottom cover, fillers are buried around the full-filter-tube drilling well pipe, a conductivity meter host in the conductivity meter is arranged on the ground, a conductivity meter sensor is arranged in the full-filter-tube drilling well pipe, and the conductivity meter sensor and the conductivity meter host are electrically connected through a cable. According to the invention, through monitoring of a single or a plurality of horizontal full filter tube drill holes, the vertical distribution and the three-dimensional distribution of underground water pollution plumes at the drill holes are estimated, and the underground water level and the underground water temperature of a drill tube well are monitored; in addition, the method can also be used for monitoring the groundwater level and the groundwater temperature of the full filter tube drilling tube well.
Description
Technical Field
The invention relates to an ionic underground water pollution detection method, in particular to a drilling underground water solubility total solid profile detection delineation method used in a permeable layered porous medium and a layered fractured rock mass field within an ionic underground water pollution plume range.
Background
The investigation of groundwater pollution is one of the main contents of site environment investigation of various countries around the world, and the problems of obvious site groundwater pollution caused by underground leakage, unreasonable mining of polluted groundwater in mines, solid waste landfill without impermeable gaskets and the like of inorganic and organic salt chemical enterprises can be caused, and the problems also exist in China in large quantity. Taking solid waste landfill sites as an example, china currently has tens of thousands of landfill sites without impermeable gaskets, and the distribution of the sites is mostly concentrated in large and medium-sized town areas, such as more than 1000 landfill sites in Beijing City, forming a "refuse wall", and the groundwater pollution caused by the sites needs to be investigated urgently. Effective investigation of the distribution of the ground groundwater pollution plume is a key premise for the remediation of the ground groundwater pollution and the restoration of the ground.
According to the current industry standard related to the underground water environmental quality monitoring in China, the investigation technical manual of the underground water pollution site in western countries such as the United states and the technical development current situation of related industries at home and abroad, the investigation of the underground water pollution plume is mainly based on the water quality monitoring by arranging filter tubes in a multi-drilling layering manner. The one-hole multilayer monitoring technology is mainly relied on high-price imported international technology in China at present. This is also a known pollution in many contaminated sites, but is not remedied for long periods of time due to site coordination, survey and remediation costs, and the like. In addition, chemical tracer technology is also commonly used for carrying out pollution site investigation, but the method is more used for investigating the horizontal migration rule of pollutants in a specific rock stratum, and the used tracer chemical reagent can also induce the problem of secondary groundwater pollution. In addition, there are some researchers exploring indirect estimation of groundwater pollution distribution by electrical prospecting technology, but the actual methods of using the methods, the specific applicable site types and the pollutant types are still to be verified and explored. At present, many kinds of underground water monitoring equipment are researched at home and abroad, but the research mostly focuses on the research and development of sensors for water quality indexes (such as pH, inorganic salt, organic matters and the like), the hydrogeological conditions of a field are rarely considered, and the field well formation technology and the water quality monitoring sensors are combined to form a complete set of underground water pollution plume tracing technology research.
The water permeability of rock-soil layers in most natural fields is vertically layered along with the difference of mineral components, rock-ore structures and structures, so that the ground groundwater pollution plumes of the fields generally tend to be distributed and moved in a long distance in the rock-soil layers with good water permeability. For this case, during the field pollution investigation, it is necessary to confirm the limits of the field permeable layer and verify the distribution of the groundwater pollution plume transported therein. According to the Fick first law (formula (1)) and the Fick second law (formula (2)), the method can be obtained by theoretical proof, and for the drill hole of which the filter tube is located at the underground water pollution layer in the whole section, all water bodies in the drill hole can reach the final uniform pollution state only through a pollutant molecule diffusion mechanism under the condition of no other water body supply; for a full filter tube drilling hole with enough length, as long as the layer position outside the underground water pollution layer position has the supply of the uncontaminated underground water source, the molecular diffusion influence of the underground water pollution layer position on the water pollution in the full filter tube drilling well tube is limited to a limited section forever.
In the formula: f D For diffusion mass flux, D is the molecular diffusion coefficient, C is the solute concentration, l is the migration distance, and t is the time.
Groundwater soluble total solids concentration ("soluble total solids concentration" abbreviated "TDS") is a common indicator of groundwater quality monitoring and has been studied to show quantitative positive or even linear correlations with groundwater conductivity ("conductivity" abbreviated "EC"). Therefore, the TDS value of the water body can be obtained through conversion of the EC value of the water quality, and compared with a TDS standard test method, the method can greatly improve the working efficiency of water quality detection and eliminate test errors caused by sampling and sample treatment. The close correlation of TDS and EC shows that the main body of TDS is an ionic solute component, so that the site groundwater pollution distribution characteristics are not suitable to be represented by groundwater TDS or EC for groundwater polluted sites mainly containing non-ionic pollutants.
Disclosure of Invention
Based on these theoretical understanding and analysis, the invention provides a method for delineating a pollution plume by using a total solid profile of the solubility of the underground water in the drilled hole, wherein the main pollutants related to the pollution plume need to be ionic pollutants. The statistical analysis of the parameters of the pollution sites at home and abroad and the engineering field application practice are combined, and the application conditions of the method are explored and specified.
The invention aims to overcome the defects of the prior art and provides a method for detecting the total solid section delineation of the solubility of the underground water in the drill hole, which has high field applicability, convenient operation and lower cost and is used for in-situ investigation of the pollution plume of the ionic underground water. The bulk contaminant referred to herein as the pollution plume needs to be an ionic contaminant. The invention also combines the statistical analysis of the parameters of the domestic and foreign polluted sites and the engineering field application practice to explore and set the application conditions of the method.
The invention relates to the integration of underground water drilling investigation technology and underground water quality electrical monitoring, which comprises a full filter tube drilling well pipe penetrating underground water pollution plume and a conductivity meter.
Meanwhile, the conductivity meter can also be used for monitoring the buried depth of the water level of underground water in the drill hole and the temperature of the underground water.
The invention estimates the vertical distribution and the three-dimensional distribution of the underground water pollution plume at the drill hole through the monitoring of the drill holes of the single or the plurality of transverse full filter pipes, and can be used for monitoring the underground water level and the underground water temperature of the drill pipe well. According to the invention, through monitoring of a single full filter tube drilling well pipe, the vertical distribution of underground water pollution plumes at a drilling position can be estimated; by monitoring the drilling holes of the plurality of transverse full filter pipes, the three-dimensional distribution of the underground water pollution plumes in the monitoring range can be estimated; in addition, the method can also be used for monitoring the groundwater level and the groundwater temperature of the full filter tube drilling tube well.
The purpose of the invention is realized by the following technical scheme:
1. a system for delineating a pollution plume with a borehole groundwater solubility total solids profile:
there are the different water permeability uniformity of multilayer water permeability in the underground, and the water permeability in every layer of water permeability uniformity is unanimous even.
The device comprises an all-filter-tube drilling well pipe penetrating underground water pollution plume and conductivity meters (2, 8 and 9), wherein the all-filter-tube drilling well pipe is inserted into each layer of water permeability uniform layer in underground soil, the bottom end of the all-filter-tube drilling well pipe is sleeved and connected with a well pipe bottom cover made of the same material, fillers are buried around the all-filter-tube drilling well pipe, and the conductivity meters (2, 8 and 9) comprise a conductivity meter host, a cable and a conductivity meter sensor; the conductivity meter main machine is arranged on the earth surface, the conductivity meter sensor is arranged in the full filter tube drilling well pipe, the conductivity meter sensor is electrically connected with the conductivity meter main machine through a cable, and the cable passes through the full filter tube drilling well pipe.
The method is used for in-situ delineation of the range of the ionic underground water pollution plume in the water permeability layered distribution field. At least one of the water permeability uniform layers has underground water pollution plumes, and the position of the limit of the underground water pollution plumes is obtained through detection by the method.
The water permeability uniform layer is a rock-soil layer or a packing layer with uniform horizontal water permeability.
The filling material is backfilled by soil, coarse sand or filling material dug by soil layers, rock layers or filling material layers in the water permeability uniform layers.
After the lower pipe of the all-filter-pipe drilling well pipe 1 enters the hole, the materials of each water-permeable uniform layer are backfilled to the periphery of the all-filter-pipe drilling well pipe 1 where the water-permeable uniform layer is located. Soil bodies or fillers 7 dug out of each soil layer or each filler layer are backfilled to corresponding depth sections on the periphery of the drilling well pipe of the full filter pipe and tamped, the well pipe 1 is fixed, and meanwhile, underground water in the rock-soil layer is guided into the drilling section with the corresponding depth.
For the formation, the grit is backfilled at its own depth section and tamped.
As shown in figure 2, the full filter tube drilling well pipe adopts a filter tube, the filter tube adopts a circular hole type full filter tube or a slit type full filter tube, and the side wall of the filter tube is provided with filter holes or filter slits. The filtering holes 10 or the filtering slits 11 are distributed in a plum blossom shape so as to ensure that the side wall of the well pipe has higher strength, the distance between the filtering holes 10 or the filtering slits 11 in the same row is controlled within the interval of 5cm-15cm, the diameter of the filtering holes 10 is about 1cm, the width of the filtering slits 11 is within the interval of 2mm-5mm, and the length of the filtering slits 11 is about 3 cm.
The conductivity meter host 2 selects a direct-current power supply conductivity meter or an alternating-current power supply conductivity meter according to field logistics supply conditions and test requirements.
The conductivity meter sensor is a hard collision and oscillation resistant conductivity sensor (such as stainless steel, polysulfone and the like).
For underground water with high corrosiveness, the conductivity meter sensor adopts a corrosion-resistant conductivity sensor (such as polysulfone material).
The conductivity resolution of the conductivity meter is about 0.1 mu S/cm, a temperature sensor is arranged in the conductivity meter, the water temperature of underground water is tested simultaneously, and the resolution precision of the water temperature is not lower than 0.1 ℃.
The cable 8 is made of a material with good insulation, water resistance, wear resistance and corrosion resistance, a length fixed scale mark 16 with the minimum unit of 1cm needs to be marked on the outer surface of the cable, and the length scale mark 16 is counted by taking the bottom of the conductivity sensor as a length origin.
The even water permeability layer in the underground water polluted site with layered water permeability is a soil layer, a rock layer or a filler layer with even water permeability, the thickness of a single layer is within the range of 1m-10m, and the permeability coefficient is more than 5 multiplied by 10 -5 cm/s and the flow of groundwater at the well casing of the whole-screen pipe borehole should be greater than 1 x 10 -9 m/s。
The inner layer winding wire, the filter screen and the outer layer winding wire are sequentially arranged outside the full filter pipe drilling well pipe from inside to outside.
And length scale marks are arranged on the full filter pipe drilling well pipe.
2. A method for delineating pollution plume by using total solid profile of underground water solubility of drill holes comprises the following steps:
1) After at least 15 days after installation of the borehole groundwater conductivity testing system into the well;
2) Conductivity EC measured by conductivity meter T As the EC reading of the host machine of the conductivity meter, the temperature T of the groundwater is measured by the conductivity meter at the same time, and the temperature T of the groundwater is converted into the standard conductivity EC under the condition of 25 ℃ by using a temperature correction formula 25℃ ；
3) Inputting a pollution source of known total soluble solids into the water-permeable uniform layer, and carrying out experiments according to the steps to obtain the concentrations of the total soluble solids and the corresponding standard conductivity EC 25℃ According to the conversion relation between the type of underground water and the standard conductivity EC of the underground water 25℃ The interval selects the conversion formula and the parameter.
4) Then, the conversion relation is utilized to measure the standard conductivity EC obtained under the condition of measurement 25℃ Processing to obtain a corresponding concentration of dissolved total solids;
5) The method comprises the following steps of (1) gradually descending a conductivity meter sensor in a full filter tube drilling well pipe from top to bottom, and judging through a measured and calculated TDS (total dissolved solids) profile of underground water in the descending process:
when the concentration of the total soluble solids continuously increases along with the increase of the depth until the concentration change rate along with the depth is smaller than a preset change rate threshold value of 100 mg/(L.m), the position of the conductivity meter sensor at the moment is considered as an upper boundary of the groundwater pollution plume;
when the concentration of the total soluble solids is continuously reduced along with the increase of the depth until the change rate of the concentration along with the depth is greater than a preset change rate threshold value of 100 mg/(L.m), the conductivity meter sensor is considered to be located at the initial depth of the sharp change section of the concentration of the total soluble solids and also to be the lower boundary of the groundwater pollution plume;
thereby obtaining the limit position of the pollution plume of the underground water.
When the total solid solubility of the underground water is monitored by a plurality of drill holes 1 in the range influenced by the same underground water pollution plume, the monitoring duration of a single batch of data is less than 48 hours.
After at least 7 days after installation of the borehole groundwater conductivity testing system into the well; gradually descending the conductivity meter sensor in the full filter pipe drilling well pipe from top to bottom, and judging according to EC (electronic logic) reading of a host machine of the conductivity meter in the descending process; when the EC reading of the conductivity meter host computer begins to show that the EC reading suddenly rises from less than 10 mu S/cm to be obviously more than 10 mu S/cm, the conductivity meter sensor is just reached to the underground water level, and the buried depth value of the underground water level is obtained through the cable scale.
The underground water pollution plume is specifically a water body with heavy metal concentration exceeding the national standard.
For an ionic underground water pollution site, under the condition that rock-soil background information of a full filter tube drilling site is less known, the method estimates the pollution concentration in pollution plumes below the underground water level in the drilling holes and the vertical boundary of the layer position where the pollution plumes are located in situ, and comprehensively estimates the three-dimensional space distribution of the pollution plumes by combining the solubility total solid profile monitoring data of a plurality of transverse drilling holes.
The method is simple, convenient and feasible, only needs a conductivity meter with a long enough effective cable and a full filter tube for drilling, and is suitable for fields with complex terrain and poor logistics supply conditions; the method has high water quality monitoring efficiency, can effectively ensure the time efficiency consistency among various monitoring data points, and can better eliminate the obvious change of the spatial distribution of the underground water pollution plume along with the time; the method has the advantages of low overall cost, easy acquisition of batch data points, convenient repeated checking and monitoring, and large-scale popularization and application of the method.
In addition, the modified conductivity meter can also be used for monitoring the buried depth of the underground water level of the drill hole and the temperature of the underground water.
Compared with the prior art, the invention has the following advantages:
(1) The method can effectively estimate the vertical distribution range of the deep groundwater pollution plume in the field (particularly the field in the rock mass region) under the condition of low knowledge degree of the related background of the target field; in addition, the invention can also monitor the spatial distribution of the underground water level of the drill hole and the water temperature of the underground water at the same time.
(2) The method is a site in-situ test, does not need sampling and sample pretreatment, can greatly eliminate the interference of test errors, eliminates the turnaround time required by the sampling test, and improves the monitoring efficiency of underground water quality; 1-2 technicians on site can complete the monitoring, and the overall monitoring cost can be obviously reduced compared with that of a common sampling test.
(3) The method is simple and easy to operate due to the main equipment, monitoring operation can be carried out only by ensuring that the site can be drilled for construction, and compared with other in-situ underground water investigation methods, the method is more suitable for remote sites with complex terrain.
Drawings
FIG. 1 is a schematic diagram of a cross-section layout structure of an engineering field.
FIG. 2 is a schematic diagram of a full-bore filter tube drilling well tube structure of the present invention (a) a round bore filter tube, and (b) a slotted filter tube).
FIG. 3 is a schematic view of the bottom sealing structure of the full-filter-pipe well casing pack.
Fig. 4 is a schematic structural distribution diagram of the conductivity meter assembly of the present invention.
FIG. 5 is a diagram showing the TDS and water level monitoring application results of the present invention in the drilling of the outer side area of the landfill body of a household garbage landfill.
In the figure, 1, a full filter pipe drilling well pipe, 2, a conductivity meter host, 3, a water permeability uniform layer, 4, underground water pollution feather, 5, underground water level, 6, underground water flow direction, 7, filling materials, 8, a cable, 9, a conductivity meter sensor, 10, filter holes, 11, filter seams, 12, a filter screen, 13, inner layer winding wires, 14, outer layer winding wires, 15, a well pipe bottom cover, 16 and length scale marks.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The examples of the invention are as follows:
as shown in figures 1-4, the method of the invention is used for in-situ investigation of the range of the ion type groundwater pollution plume with layered distribution of water permeability.
The specific implementation main body comprises a whole filter pipe drilling well pipe 1 penetrating underground water pollution plume and a conductivity meter (2, 8, 9). The full filter tube drilling well pipe 1 can be considered to adopt an insulating hard plastic pipe (such as a PVC pipe), according to theoretical analysis results of the technology and industrial specifications such as underground water monitoring well construction specification (DZ/T0270-2014), the inner diameter of the filter tube of the full filter tube drilling well pipe 1 is within an interval of 5cm-20cm, and the thickness of the filter tube 1 of the full filter tube drilling well pipe is not less than 8.4mm; the filter pipe of the full filter pipe drilling well pipe 1 can adopt a circular hole type full filter pipe or a slit type full filter pipe, the filter holes 10 or the filter slits 11 on the side wall of the filter pipe are preferably arranged in a quincunx shape to ensure that the side wall of the well pipe has higher strength, the distance between the filter holes 10 or the filter slits 11 in the same row is controlled within a range of 5cm-15cm, the diameter of each filter hole 10 is about 1cm, the width of each filter slit 11 is within a range of 2mm-5mm, and the length of each filter slit 11 is about 3 cm.
The bottom of the whole filter pipe drilling well pipe 1 needs to be sleeved by a well pipe bottom cover 15 made of the same material. The external portion of the filter pipe 1 of the full filter pipe drilling well pipe is wound into a spiral shape through the inner layer winding wire 13 to separate the external winding filter screen, the inner layer winding wire 13 is made of a hard plastic material with the thickness of about 5mm, the filter screen 12 is suitable to be arranged in two layers, the inner layer filter screen is made of an 80-mesh nylon net, the outer layer filter screen is suitable to be made of a nylon net with the size of 3-10 meshes, the filter screen 12 is required to be wound with the thick outer layer winding wire 14, and the outer layer winding wire 14 is required to be made of a material with the advantages of good toughness, strong tensile strength and corrosion resistance.
The conductivity meter comprises a conductivity meter host 2, a conductivity meter sensor 9 and a cable 8, wherein the conductivity meter host 2 can select a direct-current power supply conductivity meter or an alternating-current power supply conductivity meter according to field logistics supply conditions and test requirements, the conductivity meter sensor 9 needs to select a hard impact shock-resistant conductivity sensor (such as a stainless steel material, a polysulfone material and the like) in consideration of on-site deep hole in-situ test, and a corrosion-resistant conductivity sensor (such as a polysulfone material) is suitable for underground water with high corrosivity.
The conductivity resolution of the conductivity meter is about 0.1 mu S/cm, and the conductivity meter can directly test the water temperature of underground water at the same time, and the accuracy of the water temperature resolution is not lower than 0.1 ℃. The cable 8 of the conductivity meter is made of a material with good insulation, water resistance, wear resistance and corrosion resistance; the obvious modification of the general conductivity meter is that the length of the cable 8 is prolonged to meet the investigation requirement on the premise of ensuring the sensitivity between the conductivity meter main machine 2 and the conductivity meter sensor 9, the length scale 16 with the minimum unit of 1cm needs to be marked on the outer surface of the cable, and the length scale 16 counts by taking the bottom of the conductivity meter as the length origin.
After the pipe of the drilling well pipe 1 of the full filter pipe enters a drilling hole, soil bodies excavated from various soil layers or filler layers or fillers 7 are backfilled to corresponding depth sections at the periphery of the drilling well pipe and tamped in order to fix the well pipe 1 and guide underground water in rock-soil layers into the drilling well pipe section with corresponding depth; for rock or high-grain soil layers, coarse sand may be backfilled and tamped at the respective depth section. Well flushing and water pumping tests in the drilling construction process need to meet relevant industry standard standards. During standing after well completion, the upper port of the drilling tubular well 1 is covered by a cover so as to prevent a large amount of surface impurities and surface water from entering the well tube.
In the monitoring process of the invention, the conductivity values of the underground water bodies with different burial depths in the drilling well pipe 1 of the whole filter pipe (the conductivity values are abbreviated as EC) T ") and a water temperature value (" temperature value "abbreviated as" T "), and converting the directly measured standard conductivity value (" standard conductivity value "abbreviated as" EC ") corrected to 25 deg.C by the conversion formula (3) T5℃ "). Then, according to the type of the underground water quality of the monitored area, selecting a proper empirical conversion formula through the table 1, and converting the EC into the water quality of the underground water T5℃ Is converted intoThe TDS of the water body can obtain the evolution section of the TDS from the underground water level surface to the lower part along with the buried depth in the monitored hole. As shown in fig. 1, when the conductivity meter sensor 9 gradually enters the lower groundwater pollution plume 4 from the upper non-pollution groundwater body, the TDS rapidly increases along with the burial depth of the monitoring point until the sensor completely enters the groundwater pollution plume 4, the TDS value tends to be stable and does not significantly change along with the burial depth of the monitoring point; when the conductivity meter sensor 9 is gradually moved out from the groundwater pollution plume 4 downwards into the lower clean groundwater body, the TDS value of the water body monitored by the conductivity meter sensor 9 is rapidly reduced until reaching a stable value which does not obviously change along with the burial depth. Intensive studies have shown that permeability coefficients of greater than 5X 10 -5 A water permeability uniform layer 3 with a thickness of 1m-10m and a ground water average flow of more than 1 x 10 -9 Under the condition of m/s, the length of a TDS (total dissolved solids) rapid change section of an underground water pollution plume 4 mainly comprising ionic pollutants at the boundary of a layered water permeability uniform layer 3 is less than 0.5m, wherein the inner diameter of the full filter pipe drilling well pipe is within a range of 5cm-20 cm. Therefore, the migration horizon boundary of the groundwater pollution plume 4 can be delineated on this basis by drilling the groundwater TDS profile. Specifically, when the TDS continuously increases along with the increase of the depth until the change rate along with the depth is smaller than the preset TDS change rate threshold value of 100 mg/(L · m), the conductivity meter sensor 9 is considered to be located at the upper boundary of the groundwater pollution plume 4 at the moment; when the TDS is continuously reduced along with the increase of the depth until the TDS change rate along with the depth is greater than a preset change rate threshold value of 100 mg/(L.m), the initial depth of the TDS drastic section is considered as a lower boundary of the groundwater pollution plume 4; and the burial depth value of the corresponding boundary is obtained through the length graduation mark 16 of the cable 8.
EC 25℃ ＝(0.447+1.4034exp(-T/26.815))EC T (3)
TABLE 1 EC for common groundwater types 25℃ Conversion relation table with total dissolved solids concentration (TDS)
| Type of ground water | TDS (mg/L) and EC 25℃ Correlation of (. Mu.S/cm) |
| Fresh water | TDS＝k×EC 25℃ ，k∈[0.55,0.89] |
| Seawater, its production and use | TDS＝0.7EC 25℃ |
| Low concentration ground water for landfill | TDS＝7.17EC 25℃ ，EC25℃<500 |
| High concentration underground water for landfill | TDS＝0.0027EC 25℃ 2 -0.467EC 25℃ +2149.8,EC 25℃ ≥500 |
The invention carries out the total solid monitoring of the groundwater solubility on a plurality of drill holes within the range influenced by the same pollution plume, and the monitoring duration of each batch of data is less than 48 hours so as to ensure that the spatial distribution of the groundwater pollution plume does not change obviously in the monitoring process of the same batch.
In the invention, when the conductivity meter monitors on site, the data of each depth point is considered to be stable when the change values of the total solubility solid parameter and the temperature parameter of the conductivity host in 1min are respectively less than 0.1 muS/cm and 0.1 ℃, and relevant data is recorded.
And when the conductivity sensor moves to the deep position, the movement speed is not more than 0.2m/S so as to prevent the original water chemical equilibrium state of underground water in the borehole from being obviously disturbed.
FIG. 5 shows the TDS and water level monitoring results of the groundwater in the drill hole in the outer side area of the landfill body of the household garbage landfill, and the comparison result of the TDS profile change in the TDS and the histogram of the rock and soil layer can reflect that the groundwater pollution feather at the drill hole is distributed in the B layer of the fractured rock mass.
Therefore, the vertical distribution of the pollution plume of the underground water at the drill hole can be estimated by monitoring the drill hole of the single full filter tube; by monitoring the drilling of a plurality of transverse full filter tubes, the three-dimensional distribution of the pollution plume of the underground water can be estimated.
The invention can also be used for monitoring the underground water level and the underground water temperature of the drilling pipe well. Compared with the prior art, the invention has the advantages of comprehensive functions, more applicable site types, higher field practice effectiveness, low monitoring comprehensive cost and larger popularization and application potential.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (9)
1. A method for delineating pollution plume by using a total solid profile of the solubility of underground water in a drill hole is characterized by comprising the following steps:
the method is based on a system for delineating pollution plume through a total solid profile of solubility of drilling underground water, the system comprises an all-filter-tube drilling well pipe (1) penetrating through the pollution plume of the underground water and a conductivity meter, the all-filter-tube drilling well pipe (1) is inserted into each layer of water permeability uniform layer (3) in underground soil, the bottom end of the all-filter-tube drilling well pipe (1) is sleeved and connected with a well pipe bottom cover (15) made of the same material, a filling material (7) is embedded around the all-filter-tube drilling well pipe (1), and the conductivity meter comprises a conductivity meter host (2), a cable (8) and a conductivity meter sensor (9); the conductivity meter main machine (2) is arranged on the ground surface, the conductivity meter sensor (9) is arranged in the full filter pipe drilling well pipe (1), and the conductivity meter sensor (9) is electrically connected with the conductivity meter main machine (2) through a cable (8);
the method comprises the following steps:
1) After at least 15 days after installation of the borehole groundwater conductivity test system into the well;
2) Conductivity EC measured by conductivity meter T As EC reading of a main machine (2) of the conductivity meter, underground water temperature T is simultaneously measured by the conductivity meter, and the underground water temperature T is converted into standard conductivity EC under the condition of 25 ℃ by using a temperature correction formula 25℃ ；
3) Inputting pollution sources of known total dissolved solids into the water-permeable uniform layer (3), and carrying out experiments according to the steps to obtain the concentrations of the total dissolved solids and the corresponding standard conductivity EC 25℃ According to the conversion relation between the type of underground water and the standard conductivity EC of the underground water 25℃ Selecting conversion formula and parameter;
4) Then, the conversion relation is utilized to measure the standard conductivity EC obtained under the condition of measurement 25℃ Processing to obtain the corresponding concentration of soluble total solids;
5) The conductivity meter sensor (9) is gradually lowered in the full filter tube drilling well pipe (1) from top to bottom, and in the lowering process, judgment is carried out through the measured TDS section of the total solid concentration of the underground water solubility:
when the concentration of the total soluble solids continuously increases along with the increase of the depth until the change rate of the concentration along with the depth is smaller than a preset change rate threshold value of 100 mg/(L.m), the position of the conductivity meter sensor (9) at the moment is considered as the upper boundary of the groundwater pollution plume (4);
when the concentration of the total soluble solids is continuously reduced along with the increase of the depth until the change rate of the concentration along with the depth is greater than a preset change rate threshold value of 100 mg/(L.m), the conductivity meter sensor (9) is considered to be located at the initial depth of the sharp change section of the concentration of the total soluble solids and is also the lower boundary of the underground water pollution plume (4);
thereby obtaining the limit position of the underground water pollution plume (4).
2. The method for delineating a pollution plume with a borehole groundwater solubility total solids profile according to claim 1, wherein: after at least 7 days after installation of the borehole groundwater conductivity test system into the well; the method comprises the following steps that a conductivity meter sensor (9) is gradually lowered from top to bottom in a full filter pipe drilling well pipe (1), and in the lowering process, judgment is carried out through EC reading of a conductivity meter host (2); when the EC reading of the conductivity meter main machine (2) begins to show that the EC reading suddenly rises from less than 10 mu S/cm to be obviously more than 10 mu S/cm, the conductivity meter sensor (9) is just reached to the underground water level (5), and the buried depth value of the underground water level (5) is obtained through the cable scale.
3. The method for delineating a pollution plume with a borehole groundwater solubility total solids profile as claimed in claim 1, wherein: the water permeability uniform layer (3) is a rock-soil layer or a packing layer with uniform horizontal water permeability.
4. The method for delineating a pollution plume with a borehole groundwater solubility total solids profile as claimed in claim 1, wherein: the filling material (7) is backfilled by soil, coarse sand or filling material dug out by soil layers, rock layers or filling material layers in the water permeability uniform layer (3).
5. The method for delineating a pollution plume with a borehole groundwater solubility total solids profile according to claim 1, wherein: the full filter tube drilling well pipe (1) adopts a filter tube, the filter tube adopts a circular hole type full filter tube or a slit type full filter tube, and the side wall of the filter tube is provided with filter holes (10) or filter slits (11).
6. The method for delineating a pollution plume with a borehole groundwater solubility total solids profile according to claim 1, wherein: the conductivity resolution of the conductivity meter is about 0.1 mu S/cm, a temperature sensor is arranged in the conductivity meter, the water temperature of underground water is tested simultaneously, and the resolution precision of the water temperature is not lower than 0.1 ℃.
7. The method of claim 1, wherein the contamination plume is defined by a total solids profile of the groundwater solubility of the boreholeIs characterized in that: the water permeability uniform layer (3) is a soil layer, a rock layer or a filler layer with uniform water permeability, the thickness of a single layer is in the interval of 1m-10m, and the permeability coefficient is more than 5 multiplied by 10 -5 cm/s and the flow rate of underground water at the well pipe of the full filter pipe borehole is more than 1 x 10 -9 m/s。
8. The method for delineating a pollution plume with a borehole groundwater solubility total solids profile as claimed in claim 1, wherein: the inner layer winding wire (13), the filter screen (12) and the outer layer winding wire (14) are sequentially arranged outside the full filter pipe drilling well pipe (1) from inside to outside.
9. The method for delineating a pollution plume with a borehole groundwater solubility total solids profile according to claim 1, wherein: the full filter pipe drilling well pipe (1) is provided with length scale marks (16).
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