CN114876004B - Underground water taking method capable of inhibiting seawater invasion - Google Patents
Underground water taking method capable of inhibiting seawater invasion Download PDFInfo
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- CN114876004B CN114876004B CN202210294094.2A CN202210294094A CN114876004B CN 114876004 B CN114876004 B CN 114876004B CN 202210294094 A CN202210294094 A CN 202210294094A CN 114876004 B CN114876004 B CN 114876004B
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Abstract
The invention discloses an underground water taking method capable of inhibiting seawater intrusion, which mainly comprises the following steps: on the basis of determining hydrogeological conditions and underground water movement conditions, a water injection well is reasonably arranged on the downstream side of a traditional aquifer water pumping well; pumping underground fresh water from a pumping well at a reasonable fixed flow rate, and cooling the underground water to a certain extent according to actual conditions; then, a theoretical value of flow of recharge underground water is calculated according to a formula given by the patent, low-temperature underground water is recharged into an aquifer according to the value, and the difference between the extracted and recharged underground water flow is available underground water.
Description
Technical Field
The invention relates to an underground water taking method capable of inhibiting seawater invasion, and belongs to the technical field of underground water resource utilization.
Background
The coastal areas are developed economically, have large population and grow rapidly, so that the demand of the coastal areas for fresh water is higher and higher, and the extraction of underground water is one of the important ways for obtaining water sources in the coastal areas. Especially for arid and semiarid regions, underground water resources are more important. However, after the groundwater is extracted in these areas, the groundwater level is reduced because the surface water is lack of resources, and the surface water cannot be timely supplemented with the groundwater, so that the seawater further invades into the aquifer, thereby the underground fresh water is salted, the reserve of the groundwater which can be directly used is reduced, and the situation of water shortage in coastal areas is aggravated.
In order to inhibit seawater invasion and increase the available fresh water reserves in aquifers, various methods are adopted at home and abroad: and (1) constructing an underground seepage-stopping wall. The permeability of the underground seepage-stopping wall is low, and the seawater invasion is mainly prevented by cutting off the passage of the seawater invasion. However, this method requires high initial installation and material costs. (2) And (4) artificial water injection, namely, the fresh water is manually refilled in the aquifer where the seawater invasion occurs to lift the underground water level so as to achieve the effect of inhibiting the seawater invasion. The method is simple and effective for inhibiting seawater invasion, has low cost and is widely adopted. However, this method consumes a large amount of fresh water, and sometimes it is difficult to effectively alleviate the water shortage in coastal areas. Research shows that the water injection temperature is lower than the groundwater temperature, the water injection device has a lifting effect on the groundwater level, so that the effect of inhibiting seawater invasion is achieved, and the effect is obvious. However, in the past, the effect of water injection temperature is always ignored when artificial water injection is adopted, and if the temperature of the recharge fresh water can be reduced to be lower than the temperature of underground water, a part of underground water level can be raised by utilizing low temperature carried by the recharge fresh water, so that the water quantity of the needed recharge fresh water is reduced.
Based on the above analysis, the present inventors have combined the temperature effects of pumping groundwater, artificial flooding and flooding, and have generated this.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an underground water taking method capable of inhibiting seawater invasion, which can extract underground water and inhibit the seawater invasion.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the invention provides an underground water taking method capable of inhibiting seawater intrusion, which comprises the following steps:
arranging a water injection well at the downstream of a traditional pumping well according to the characteristics of an underground aquifer;
pumping fresh water in an underground aquifer through a pumping well at a certain flow rate;
cooling the pumped underground water to a certain temperature;
calculating a theoretical value of recharge groundwater flow, and recharging the cooled groundwater into an underground aquifer according to the theoretical value;
the difference between the flow of the pumped groundwater and the flow of the recharged groundwater is the available groundwater.
Further, the theoretical value of the flow of the recharge groundwater is calculated according to the following formula:
in the formula: n is the extractability of groundwater;
Q in is the flow rate of groundwater recharge through the water injection well;
T mix the average temperature of the groundwater in the aquifer after the groundwater is recharged is stabilized;
Q out pumping the flow of underground water through a pumping well;
Q FSGD the flow rate of the groundwater in the aquifer before the groundwater is pumped;
T FSGD is the average temperature of groundwater in the aquifer prior to pumping groundwater;
T in the temperature of groundwater for recharging;
μ (T) represents the viscosity corresponding to water at a temperature T.
Further, the viscosity corresponding to the water with the temperature T is expressed as follows:
further, the flow Q of the underground water pumped by the pumping well out And the determination is carried out according to the underground water occurrence condition.
Further, the groundwater flow Q in the aquifer before groundwater extraction FSGD Determined by conventional hydrogeological survey methods.
Further, the average groundwater temperature T in the aquifer before groundwater extraction FSGD Determined by conventional hydrogeological survey methods.
Further, the temperature T of the recharge groundwater in Determined by the field conditions.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an underground water taking method capable of inhibiting seawater intrusion, which considers the inhibition effect of low temperature on seawater intrusion and combines water pumping and water injection. Pumping underground fresh water from the aquifer, then re-injecting a part of cooled underground water into the aquifer, and offsetting the drop of the underground water level caused by the difference between the pumping amount and the water injection amount by utilizing the lifting effect of the low temperature carried by the injected underground water on the underground water level, thereby achieving the effect of inhibiting the intrusion of seawater under the condition of pumping the underground water.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic illustration of an embodiment of the present invention applied to a confined aquifer;
fig. 3 is a plot of salinity in an aquifer before groundwater is pumped and after groundwater recharge in the case shown in fig. 2.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The embodiment introduces an underground water taking method capable of inhibiting seawater intrusion, which comprises the following steps:
arranging a water injection well at the downstream of the traditional pumping well according to the characteristics of the underground aquifer;
pumping fresh water in an underground aquifer through a pumping well at a certain flow rate;
cooling the pumped underground water to a certain temperature;
calculating a theoretical value of recharge groundwater flow, and recharging the cooled groundwater into an underground aquifer according to the theoretical value;
the difference of the groundwater flow rate of pumping and recharging is the available groundwater.
Referring to fig. 1, the method for taking underground water capable of inhibiting seawater intrusion according to the present embodiment is specifically applied to the following steps:
(1) According to the characteristics of an underground aquifer, a water injection well is reasonably arranged at the downstream of a traditional pumping well;
(2) Pumping fresh water in an underground aquifer through a pumping well at a certain flow rate according to the occurrence condition of underground water;
(3) Cooling the pumped underground water to a certain temperature, wherein the cooling temperature is determined according to the field situation;
(4) Calculating the theoretical value of recharge groundwater flow by using the following formula, and recharging the cooled groundwater into the groundwater aquifer according to the value:
in the formula: n is the extraction rate of the underground water and is calculated by the formula;
Q in calculating the flow rate of groundwater recharging through the water injection well by the above formula;
T mix the average temperature of the groundwater in the aquifer after the groundwater is recharged after being stabilized is calculated by the formula
Obtaining;
Q out the flow rate of the underground water is extracted through the pumping well according to the occurrence condition of the underground water;
Q FSGD the flow of groundwater in the aquifer before groundwater extraction can be determined by conventional hydrogeological investigation
Determining a method;
T FSGD to obtain the average temperature of groundwater in the aquifer before pumping groundwater, the conventional hydrogeology can be used
Determining a survey method;
T in the temperature of the groundwater is recharged, depending on the situation;
μ (T) represents the viscosity corresponding to water at temperature T, expressed as:
in summary, the present invention is an underground water intake method capable of inhibiting seawater intrusion, and is characterized in that the inhibition effect of low temperature on seawater intrusion is considered, and the method is combined with water pumping and water injection. Pumping underground fresh water from the aquifer, then re-injecting a part of cooled underground water into the aquifer, and offsetting the drop of the underground water level caused by the difference between the pumping amount and the water injection amount by utilizing the lifting effect of the low temperature carried by the injected underground water on the underground water level, thereby achieving the effect of inhibiting the intrusion of seawater under the condition of pumping the underground water.
The invention also has a numerical simulation result, which proves that the invention can also inhibit the seawater invasion while pumping the underground water.
The present invention will be described with reference to the above effects by the following preferred embodiments.
Case analysis
The underground water taking method disclosed by the invention utilizes the efficiency of underground water and simulates the distribution diagram of the concentration of the saline water in the aquifer before and after the underground water is pumped by using a numerical simulation mode.
Numerical simulations were performed using the SUTRA _ MS software.
The simulation region is a confined aquifer, the model is set to be a two-dimensional plane model, the model schematic diagram is shown in FIG. 2, the model is 1680m long and 100m high; the right boundary is a sea boundary, the salinity of the seawater is set to be 35ppt, and the sea level is arranged at the top of the aquifer; the left boundary is the inland fresh water boundary, the salinity of the fresh water is set to be 0ppt, and the flow of the fresh water is set to be 4.62m 2 D (single width, same below). The suction well inlet is arranged at (x = -1260m, z = -50m), and the injection well outlet is arranged at (x = -840m, z = -50m). The temperature of underground water before water injection is 33.9 ℃, and the temperature of recharge underground water is 22.4 ℃. The pumping flow is 3.69m 2 D, calculating the flow of the recharge underground water to be 2.90m by using the formula in the step 3 2 D,. The actual groundwater flow rate was therefore 0.79m 2 /d。
The length of a mesh split in an area 0-420m away from the sea boundary is 1.4m, and the height is 2m; the length of the mesh divided in the area 420-1680m away from the sea boundary is 4.2m, the height is 2m, and the total number of the meshes is 30000. The model is a homogeneous, isotropic permeability field, permeability k =1.21 × 10 -11 m 2 A porosity of0.45, longitudinal diffusion coefficient (in the direction of water flow) α L =1m, transverse diffusion coefficient (perpendicular water flow direction) α T And the simulation step length is 5d, and the simulation results are all results reaching a steady state.
The simulation results are shown in fig. 3. FIG. 3a is the salinity profile in the aquifer before groundwater is pumped away, and FIG. 3b is the salinity profile in the aquifer after groundwater recharge. The seawater invasion length before groundwater extraction (the length from the intersection point of the 50% seawater salinity contour line and the bottom of the aquifer to the seawater boundary) is 378m, the seawater invasion length after groundwater recharge is 368m, and the seawater invasion length is slightly reduced compared with the seawater invasion length before groundwater extraction, and the effect of inhibiting seawater invasion under the condition of utilizing groundwater is verified.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and those improvements and modifications should be considered as the protection scope of the present invention.
Claims (6)
1. An underground water intake method capable of inhibiting seawater intrusion, comprising:
arranging a water injection well at the downstream of the traditional pumping well according to the characteristics of the underground aquifer;
pumping fresh water in an underground aquifer through a pumping well at a certain flow rate;
cooling the pumped underground water to a certain temperature;
calculating a theoretical value of recharge groundwater flow, and recharging the cooled groundwater into an underground aquifer according to the theoretical value;
the difference between the flow rate of the pumped groundwater and the flow rate of the recharged groundwater is the available groundwater;
the theoretical value of recharge groundwater flow is calculated according to the following formula:
in the formula: n is the extractability of groundwater;
Q in is the flow rate of groundwater recharge through the water injection well;
T mix the average temperature of the groundwater in the aquifer after the groundwater is recharged is stabilized;
Q out pumping the flow of underground water through a pumping well;
Q FSGD the flow rate of the groundwater in the aquifer before the groundwater is pumped;
T FSGD is the average temperature of groundwater in the aquifer prior to pumping groundwater;
T in the temperature of groundwater for recharging;
μ (T) represents the viscosity corresponding to water at a temperature T.
2. An underground water intake method capable of suppressing seawater intrusion according to claim 1, wherein: the viscosity corresponding to the water with the temperature T is expressed as follows:
3. an underground water intake method capable of suppressing seawater intrusion according to claim 1, wherein: flow Q for pumping underground water through pumping well out And the determination is carried out according to the underground water occurrence condition.
4. An underground water intake method capable of suppressing seawater intrusion according to claim 1, wherein: groundwater flow Q in the aquifer before groundwater extraction FSGD Determined by conventional hydrogeological survey methods.
5. An underground water intake method capable of suppressing seawater intrusion according to claim 1, wherein: the average temperature T of groundwater in an aquifer before groundwater extraction FSGD Determined by conventional hydrogeological survey methods.
6. An underground water intake method capable of suppressing seawater intrusion according to claim 1, wherein: temperature T of the recharge groundwater in Determined by the field conditions.
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Citations (4)
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| CN101329113A (en) * | 2008-07-01 | 2008-12-24 | 哈尔滨工业大学 | Anti-block system of ground water recharging well |
| CN106522306A (en) * | 2016-12-17 | 2017-03-22 | 山东省水利科学研究院 | Riverside underground water recharging system with composite functions of charging and pumping |
| CN110206100A (en) * | 2019-06-18 | 2019-09-06 | 济南大学 | A kind of equivalent, which fills to take out, recycles the method that underground heat can be carried out ice age water delivery |
| CN211927613U (en) * | 2020-03-31 | 2020-11-13 | 中国科学院地理科学与资源研究所 | Test device for seawater invasion repair in heterogeneous coastal aquifer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105696647A (en) * | 2016-03-31 | 2016-06-22 | 大连久鼎祥瑞特种工程技术研究院有限公司 | Underground reservoir technology preventing seawater intrusion |
| FR3054705B1 (en) * | 2016-07-29 | 2018-07-27 | Veolia Environnement-VE | TOOL FOR MANAGING MULTIPLE WATER RESOURCES |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329113A (en) * | 2008-07-01 | 2008-12-24 | 哈尔滨工业大学 | Anti-block system of ground water recharging well |
| CN106522306A (en) * | 2016-12-17 | 2017-03-22 | 山东省水利科学研究院 | Riverside underground water recharging system with composite functions of charging and pumping |
| CN110206100A (en) * | 2019-06-18 | 2019-09-06 | 济南大学 | A kind of equivalent, which fills to take out, recycles the method that underground heat can be carried out ice age water delivery |
| CN211927613U (en) * | 2020-03-31 | 2020-11-13 | 中国科学院地理科学与资源研究所 | Test device for seawater invasion repair in heterogeneous coastal aquifer |
Non-Patent Citations (1)
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| Adaptive surrogate model based multiobjective optimization for coastal aquifer management;JianSong等;《Journal of Hydrology》;20180327;98-111 * |
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