Simulation System and Method for the Evolution of Aquifer Water and Salt in Island Areas under the Influence of Underground Structures

Abstract

This application relates to the field of water and salt distribution technology, and discloses a simulation system and method for the evolution of water and salt in an island aquifer under the influence of underground structures. The method includes: pre-dyeing seawater using NaCl and carmine; diluting the dyed seawater proportionally to prepare saturated sand column standard samples with different salinity gradients, and acquiring their profile images; extracting the average gray value, corresponding global temperature, and salinity from the profile image of each saturated sand column standard sample; fitting the average gray value, global temperature, and salinity corresponding to the saturated sand column standard samples to establish a salinity inversion model coupled with global temperature; acquiring experimental profile images and experimental global temperature of the water and salt evolution experiment of an island aquifer under the influence of underground structures; and generating a two-dimensional salinity distribution data field based on the salinity inversion model, experimental profile images, and experimental global temperature. By acquiring real-time full-profile images of the aquifer under test and establishing the relationship between light intensity and salinity, interpolation is not required, resulting in more accurate simulation results.

Description

Technical Field

[0001] This application relates to the field of water and salt distribution technology, for example to a simulation system and method for the evolution of water and salt in an island aquifer under the influence of underground structures. Background Technology

[0002] Underground structures on artificial islands are susceptible to seawater intrusion, which can lead to corrosion of the reinforcing steel and further structural failure and instability. Therefore, real-time monitoring of the dynamic distribution of water and salt near underground structures is crucial.

[0003] Currently, the resistivity method is the most common method for monitoring the salinity distribution characteristics of aquifers on islands. This method requires setting up multiple monitoring points within the monitoring profile and measuring resistivity data, which is then post-processed to convert it into groundwater salinity. In locations without monitoring points, mathematical methods such as interpolation are needed for estimation. Especially near underground structures, due to the significant spatial differences in groundwater salinity distribution, the data estimated using interpolation methods often deviates considerably from the actual values.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0006] This disclosure provides a simulation system and method for the evolution of aquifer water and salt under the influence of underground structures, in order to improve the accuracy of simulation results.

[0007] In some embodiments, the simulation method for the evolution of water and salt in an island aquifer under the influence of underground structures includes: pre-dyeing seawater with NaCl and carmine; diluting the dyed seawater proportionally to prepare saturated sand column standard samples with different salinity gradients, and acquiring their profile images; extracting the average gray value of the target area in each profile image, as well as the global temperature and salinity of the corresponding saturated sand column standard sample; fitting the average gray value, global temperature, and salinity corresponding to the saturated sand column standard sample to establish a salinity inversion model coupled with global temperature; acquiring experimental profile images and experimental global temperatures of the dynamic evolution of water and salt in an island aquifer under the influence of underground structures; and generating a two-dimensional salinity distribution data field based on the salinity inversion model, the experimental profile images, and the experimental global temperature.

[0008] In some embodiments, the simulation system for the evolution of water and salt in an island aquifer under the influence of underground structures is applied to experiments on the dynamic evolution of water and salt in an island aquifer under the influence of underground structures. The system includes: a seepage channel comprising: multiple visible partitions and multiple interconnected visible fan-shaped water tank units; the visible partitions are pluggable to both sides of the fan-shaped water tank units, allowing each fan-shaped water tank unit to be assembled into an internally interconnected cylindrical water tank or separated into independent units; each fan-shaped water tank unit is divided into a fan-shaped medium tank and a seawater tank located around the arc of the medium tank, the medium tank being connected to the seawater tank; a precipitation simulation system, with its outlet located at the top of the medium tank for supplying freshwater to the medium tank; and a tide generating device, with its outlet connected to the seawater tank for supplying seawater to the seawater tank.

[0009] The simulation system and method for the evolution of aquifer water and salt under the influence of underground structures provided in this disclosure can achieve the following technical effects:

[0010] First, based on the profile image of a pre-fabricated saturated sand column standard sample, the corresponding grayscale average, global temperature, and salinity are extracted, and a salinity inversion model coupled with global temperature is constructed. Then, a simulation system based on the water-salinity evolution of an island aquifer under the influence of underground structures is used to simulate the dynamic evolution experiment of forming a freshwater lens, thus obtaining the experimental profile image and global temperature of the dynamic evolution experiment. Finally, based on the salinity inversion model, combined with the experimental profile image and global temperature, a two-dimensional salinity distribution data field is generated. In this way, by acquiring real-time full-profile images of the aquifer under test and establishing the relationship between light intensity and salinity, an accurate salinity distribution map of the entire profile is obtained, eliminating the need for complex and inaccurate post-processing using interpolation methods, making the simulation results more intuitive and accurate.

[0011] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0012] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0013] Figure 1 This is a schematic diagram of the structure of the simulation system for the evolution of aquifer water and salt under the influence of underground structures provided in the embodiments of this disclosure;

[0014] Figure 2 This is a schematic diagram of the structure of the fan-shaped water tank unit provided in the embodiments of this disclosure;

[0015] Figure 3This is a schematic diagram of a simulation method for the evolution of aquifer water and salt under the influence of underground structures provided in this embodiment of the disclosure;

[0016] Figure 4 This is a schematic diagram of the method for conducting an experiment on the dynamic evolution of water and salt in an island aquifer under the influence of underground structures, provided in an embodiment of this disclosure.

[0017] Figure 5 This is a schematic diagram of a method for collecting experimental profile images of the dynamic evolution of water and salt in an island aquifer under the influence of underground structures, as provided in an embodiment of this disclosure.

[0018] Figure 6 This is a schematic diagram of a method for generating a two-dimensional salinity distribution data field based on a salinity inversion model, an experimental profile image, and an experimental global temperature, provided in an embodiment of this disclosure.

[0019] Figure label:

[0020] 10. Visible partition; 20. Fan-shaped water tank unit; 21. Medium tank; 22. Seawater tank; 23. Fan-shaped water tank; 231. Arc-shaped sidewall; 232. Inner wall; 233. Outer wall; 234. First connecting hole; 235. Inlet; 236. Overflow outlet; 24. Arc-shaped baffle; 241. Second connecting hole; 25. Structure model; 26. Rubber strip; 30. Rainfall simulation system; 31. First water storage tank; 32. Sprinkler head; 33. First water pump; 34. First water pipe; 40. Tide generating device; 41. Second water storage tank; 42. Variable height overflow column; 421. Outlet; 422. Return water outlet; 43. Second water pump; 44. Second water pipe; 45. Third water pipe; 46. Fourth water pipe; 50. Base plate; 51. Annular protrusion; 60. Clamp. Detailed Implementation

[0021] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0022] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0023] Unless otherwise stated, the term "multiple" means two or more.

[0024] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0025] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0026] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0027] Combination Figure 1 As shown, this disclosure provides a simulation system for the evolution of aquifer water and salt under the influence of underground structures on an island, including: a seepage channel, a precipitation simulation system 30, and a tide generating device 40. The seepage channel includes: multiple visible partitions 10 and multiple interconnected fan-shaped water tank units 20. The number of visible partitions 10 is twice the number of fan-shaped water tank units 20, and the visible partitions 10 are pluggable into both sides of the fan-shaped water tank unit 20. The fan-shaped water tank unit 20 is a visible structure, for example, made of transparent material. When the visible partitions 10 are inserted into both sides of the fan-shaped water tank unit 20, each fan-shaped water tank unit 20 is separated into independent units and is not interconnected. When the visible partitions 10 on both sides of the fan-shaped water tank 20 are removed, the fan-shaped water tank units 20 are interconnected, forming an internally interconnected cylindrical water tank. Each fan-shaped water tank unit 20 is internally divided into a medium tank 21 and a seawater tank 22. The medium tank 21 is fan-shaped and located in the inner circle, while the seawater tank 22 is located in the outer circle of the arc of the medium tank 21. Simultaneously, the medium tank 21 is connected to the corresponding seawater tank 22. Thus, when the fan-shaped water tank units 20 are combined to form a cylindrical water tank with internal interconnection, the medium tank 21 of each fan-shaped water tank unit 20 forms the inner circle of the cylindrical water tank, simulating an artificial island. The seawater tank 22 of each fan-shaped water tank unit 20 forms the outer circle of the cylindrical water tank, simulating the sea area surrounding the artificial island. The outlet side of the precipitation simulation system 30 is located at the top of the medium tank 21, i.e., above the medium tank 21, and is used to supply fresh water to the medium tank 21. The outlet side of the tide generating device 40 is connected to the seawater tank 22 and is used to supply seawater to the seawater tank 22.

[0028] The simulation system for the evolution of aquifer water and salt under the influence of underground structures provided in this embodiment uses a seepage channel composed of multiple fan-shaped water tank units 20. The internal part of the fan-shaped water tank 23 is divided into an inner medium tank 21 and an outer seawater tank 22, and the medium tank 21 and the seawater tank 22 are connected. The outlet side of the precipitation simulation system 30 is located at the top of the medium tank 21, and delivers freshwater to the medium tank 21 to simulate the freshwater of the artificial island. The outlet side of the tide generating device 40 is connected to the seawater tank 22, and delivers seawater to the seawater tank 22 to simulate seawater intrusion. Each fan-shaped water tank unit 20 has a pluggable visible partition 10 on both sides. When the visible partition 10 is pulled out, each fan-shaped water tank unit 20 is interconnected and spliced ​​together to form a cylindrical water tank. Each medium tank 21 forms the inner circle of the cylindrical water tank to simulate the artificial island, and each seawater tank 22 forms the outer circle of the cylindrical water tank to simulate the sea area surrounding the artificial island. This allows for the dynamic simulation of freshwater displacing seawater to form a freshwater lens. When the visible partition 10 is inserted, each fan-shaped water tank unit 20 separates into an independent unit. After each independent unit is removed, since the fan-shaped water tank unit 20 and the visible partition 10 are visible, an image acquisition module can be used to acquire real-time side images of the fan-shaped water tank unit 20, which is equivalent to a cross-sectional image of a cylindrical water tank. This allows for real-time and intuitive recording of the brackish water distribution characteristics of the aquifer. This image can then be used to determine the accurate salinity distribution map of the entire profile without the need for complex and imprecise post-processing using interpolation methods, resulting in more intuitive and accurate simulation results.

[0029] Optionally, the visible partition 10 is made of waterproof transparent acrylic glass. The visible partition 10 is adapted to the side of the fan-shaped water tank unit 20 and adopts a plate-like structure that matches its size and shape.

[0030] Optionally, combined Figure 1 and Figure 2As shown, the fan-shaped water tank unit 20 includes: a fan-shaped water tank 23, an arc-shaped baffle 24, a structure model 25, and a water-containing medium. The fan-shaped water tank 23 has two planar sidewalls, an arc-shaped sidewall 231, and a bottom wall, and is enclosed by a transparent visible material (such as acrylic sheet or glass). The planar sidewalls on both sides are provided with chambers for inserting and removing the visible partition 10. Simultaneously, the planar sidewalls are also provided with multiple evenly arranged first connecting holes 234. When the visible partition 10 is inserted into the chamber, the first connecting holes 234 of two adjacent fan-shaped water tanks 23 are blocked, and each fan-shaped water tank unit 20 is separated into an independent unit. When the visible partition 10 is removed, the first connecting holes 234 of two adjacent fan-shaped water tanks 23 are interconnected. The arc-shaped baffle 24 is inserted into the fan-shaped water tank 23, thereby dividing the internal space of the fan-shaped water tank 23 into a medium tank 21 and a seawater tank 22. The arc-shaped baffle 24 is provided with multiple evenly arranged second connecting holes 241 for connecting the medium tank 21 and the seawater tank 22. The structure model 25 is set in the medium tank 21 according to the actual construction needs. The water-bearing medium is filled in the medium tank 21. Optionally, the water-bearing medium is uniformly sized transparent glass beads. In this way, by setting the structure model 25 in the medium tank 21, the influence of the actual underground structure group can be simulated, thereby more accurately analyzing the three-dimensional variation characteristics of the groundwater salt distribution of the artificial island.

[0031] Optionally, see again Figure 2 The planar sidewalls of the fan-shaped water tank 23 include an inner wall 232 and an outer wall 233. The inner wall 232, bottom wall, and arc-shaped sidewall 231 of the fan-shaped water tank 23 together enclose the internal space of the fan-shaped water tank 23. The outer wall 233 of the fan-shaped water tank 23 is located outside the inner wall 232, and together with the inner wall 232, outer wall 233, bottom wall, and arc-shaped sidewall 231, it encloses a chamber for inserting and removing the visible partition 10. That is, the planar sidewalls on both sides of the fan-shaped water tank 23 are double-layered hollow structures. Multiple first connecting holes 234 are evenly distributed on the inner wall 232 and outer wall 233, and the first connecting holes 234 are connected to the chamber. Thus, when the visible partition 10 is pulled out, two adjacent fan-shaped water tanks 23 can communicate with each other.

[0032] Optionally, the fan-shaped water tank unit 20 also includes a rubber strip 26. The rubber strip 26 is attached to the outer periphery of the planar sidewall, that is, the outward circumferential edge of the outer wall 233. In this way, the outer walls 233 of two adjacent fan-shaped water tank units 20 can be more tightly fitted together by the rubber strip 26, preventing water leakage.

[0033] Optionally, a rubber strip 26 is also attached around the perimeter of the visible partition 10 to prevent water leakage when inserted into the cavity.

[0034] Optionally, see again Figure 1The seepage channel also includes a base plate 50. Optionally, the base plate 50 is a plate-like structure with a square, circular, or other similar shape. An annular protrusion 51 is provided on the base plate 50, and the inner diameter of the annular protrusion 51 matches the outer diameter of the cylindrical water tank. The cylindrical water tank, formed by splicing and assembling, is placed within the annular protrusion 51, thus being surrounded and fixed, resulting in greater stability.

[0035] Optionally, the seepage channel also includes a clamp 60. The clamp 60 is fitted around the outer periphery of the cylindrical water tank, and the tension is finely adjusted by fastening bolts. This ensures the long-term stability and integrity of the cylindrical water tank. Optionally, the clamp 60 is made of metal.

[0036] Optionally, see [link to relevant documentation] Figure 1 The precipitation simulation system 30 includes a first water storage tank 31, a sprinkler head 32, and a first water pump 33. The first water storage tank 31 stores colorless fresh water. The inlet of the sprinkler head 32 is connected to the outlet of the first water storage tank 31 via a first water pipe 34. The sprinkler head 32 serves as the outlet side of the precipitation simulation system 30 and is located above the medium tank 21. The first water pump 33 is mounted on the first water pipe 34. When the first water pump 33 is turned on, fresh water is sprayed into the medium tank 21 through the sprinkler head 32.

[0037] Optionally, the first water pump 33 is a peristaltic pump.

[0038] Optionally, see [link to relevant documentation] Figure 1 The tide generating device 40 includes a second water storage tank 41, a variable-height overflow column 42, and a second water pump 43. The second water storage tank 41 stores dyed seawater. The variable-height overflow column 42 has an inlet on one side and an outlet 421 and a return outlet 422 on the other side, with the return outlet 422 positioned higher than the outlet 421. Correspondingly, the arc-shaped sidewall 231 of the seawater tank 22 has an inlet 235 and an overflow outlet 236, with the overflow outlet 236 positioned higher than the inlet 235. The outlet of the second water storage tank 41 is connected to the inlet via a second water pipe 44, and the second water pump 43 is mounted on the second water pipe 44 to transport seawater to the variable-height overflow column 42. The outlet 421, serving as the outlet side of the tide generating device 40, is connected to the inlet 235 via a third water pipe 45 to transport seawater to the seawater tank 22. Overflow port 236 is connected to return port 422 through fourth water pipe 46. Excess water in seawater tank 22 flows back to variable height overflow column 42 through overflow port 236.

[0039] Optionally, the second pump 43 is a peristaltic pump to generate sinusoidal sea level fluctuations.

[0040] Optionally, seawater is prepared using sea salt solution with a salt concentration of 34 g / L. Simultaneously, the seawater is dyed with carmine dye at a concentration of 1 g / L. The second water tank 41 contains 30 L of the prepared brine. The first water tank 31 contains 30 L of deionized water.

[0041] Optionally, the simulation system for the evolution of aquifer water and salt under the influence of underground structures also includes a temperature sensor. The temperature sensor is positioned in the middle of the medium tank 21 to record global temperature data during the experiment. Optionally, the temperature sensor is a miniature fiber optic temperature sensor with an accuracy of ±0.1 ℃ and a time resolution of 10 min.

[0042] During the experiment:

[0043] 1. Salt distribution in the aquifer of the original artificial island:

[0044] Based on the simulated burial depth and distribution of underground structures, a model 25 of the structure is placed in the medium tank 21 beforehand. Under saturated conditions of dyed seawater, transparent glass beads with an average particle size of 1 mm are filled into the medium tank 21 in layers, 5 cm at a time and compacted, until the aquifer thickness is 40 cm. At this point, the aquifer medium is filled with dyed seawater to simulate the water and salt distribution when the artificial island is initially built. The tide generating device 40 is turned on, and the peristaltic pump installed in the second water pipe 44 slowly delivers dyed seawater to the seawater tank 22, constructing a sinusoidal wave of seawater level fluctuations. Excess seawater flows out from the overflow port 236.

[0045] 2. Formation and evolution of freshwater lenses in aquifers of artificial islands:

[0046] Turn on the peristaltic pump connected to the first water pipe 34, and spray fresh water onto the surface of the medium tank 21 through the spray head 32. The fresh water gradually seeps into the aquifer and floats above the seawater, gradually displacing the seawater to form a freshwater lens. The remaining fresh water enters the seawater tank 22 through the second connecting hole 241 on the arc-shaped baffle 24 and flows out rapidly from the overflow port 236 of the seawater tank 22.

[0047] 3. Observation methods and evaluation indicators:

[0048] When it is necessary to observe the dynamic evolution of the freshwater lens, impermeable visible partitions 10 are inserted into the cavities of the planar sidewalls on both sides of each fan-shaped water tank 23 to seal the fluid within the water-containing medium. Then, the externally fixed clamps 60 are opened, disassembling the system into multiple independent fan-shaped water tank units 20. In a darkroom environment (shielding from outdoor light interference), LED matrix lights of the same size as the water tank are installed on the back of each fan-shaped water tank unit 20 (ensuring uniform light intensity). A high-resolution digital camera (24 megapixels or greater) is used to photograph the cross-section of the fan-shaped water tank unit 20, recording the image every 10 minutes. If the maximum change in the brackish water interface within 10 minutes is less than or equal to 1 mm, the system is considered to have reached steady state, and the recording stops. The acquired images can be used to analyze the precise salinity distribution map of the entire cross-section.

[0049] Combination Figure 3 As shown in the figure, this disclosure provides a simulation method for the evolution of aquifer water and salt under the influence of underground structures on an island, including:

[0050] S101 uses NaCl and carmine to pre-dye standard seawater; dilute the standard dyed seawater according to the ratio to prepare saturated sand column standard samples with different salinity gradients, and collect their profile images.

[0051] S102, extract the average gray value of the target area in each profile image, as well as the global temperature and salinity of the corresponding saturated sand column standard sample;

[0052] S103, fit the average gray value, global temperature and salinity corresponding to the saturated sand column standard sample to establish a global temperature coupled salinity inversion model;

[0053] S104, to collect experimental profile images and global temperature of the island aquifer dynamic evolution experiment under the influence of underground structures;

[0054] S105 generates a two-dimensional salinity distribution data field based on the salinity inversion model, experimental profile images, and global experimental temperature.

[0055] A simulation system for the evolution of aquifer water and salinity under the influence of underground structures was used to conduct experiments on the dynamic evolution of aquifer water and salinity under the influence of underground structures. Using the same aquifer medium and dyed seawater as in the dynamic evolution experiment, several saturated sand column standard samples with different seawater salinities were prepared in advance. Standard dyed seawater was prepared using a 34 g / L NaCl solution and a 1 g / L carmine. The standard dyed seawater was diluted proportionally; optionally, the diluted seawater salinities were 0, 8.5 g / L, 17 g / L, and 34 g / L. The saturated sand column standard samples were placed in a constant temperature environment at 5 ℃, 15 ℃, 25 ℃, and 35 ℃ for a first preset time, and then their cross-sectional images were captured using an image acquisition module, such as a camera. Optionally, the first preset time was 24 hours.

[0056] The average grayscale value of the target region in each profile image is extracted, along with the global temperature (temperature of the isothermal environment in which the saturated sand column standard sample is located) and salinity of the corresponding saturated sand column standard sample. The average grayscale value, global temperature, and salinity corresponding to the saturated sand column standard sample are fitted to obtain a salinity inversion model coupled with global temperature. Profile images of each sector water tank unit in the dynamic evolution experiment, as well as the global temperature of the simulation system, are acquired through the image acquisition module and defined as the experimental global temperature. Based on the salinity inversion model, the profile images of the dynamic evolution experiment, and the experimental global temperature, a two-dimensional salinity distribution data field is generated.

[0057] The simulation method for water-salinity evolution of aquifers on islands under the influence of underground structures, as provided in this disclosure, firstly extracts the corresponding grayscale average, global temperature, and salinity from the profile image of a pre-fabricated saturated sand column standard sample, thereby constructing a salinity inversion model coupled with global temperature. Then, based on the simulation system for water-salinity evolution of aquifers on islands under the influence of underground structures, a dynamic evolution experiment forming a freshwater lens is simulated, resulting in experimental profile images and global temperatures from the dynamic evolution experiment. Finally, based on the salinity inversion model, combined with the experimental profile images and global temperatures, a two-dimensional salinity distribution data field is generated. In this way, by acquiring real-time full-profile images of the aquifer under test and establishing the relationship between light intensity and salinity using the images, an accurate salinity distribution map of the entire profile is obtained, eliminating the need for complex and inaccurate post-processing using interpolation methods, making the simulation results more intuitive and accurate.

[0058] Optionally, a global temperature-coupled salinity inversion model is established, including:

[0059] A salinity inversion model is constructed using temperature correction terms for grayscale and salinity:

[0060] ;

[0061] in, Salinity of the target area, in g / L; Grayscale value; For temperature; This is a correction term for the temperature-salinity-grayscale scaling factor; This is the correction term for the salinity-grayscale curvature coefficient due to temperature. This is a correction term for the background salinity of the simulation system due to temperature.

[0062] ,in, and This is a fitting constant used to correct for temperature-induced salinity fluctuations; for example, as temperature increases, the light transmittance of dyed seawater decreases. The salinity inversion value needs to be increased to compensate for the salinity inversion value.

[0063] ,in, and is a fitting constant used to correct for the light transmittance of dyed seawater caused by temperature. It is negative, and the absolute value increases with increasing temperature, representing the "steepness" of the decrease in salinity with increasing gray value.

[0064] ,in, and This is a fitting constant used to correct for errors in the freshwater reference concentration caused by temperature.

[0065] The average gray value, global temperature, and salinity of the profile image corresponding to a saturated sand column standard sample are a set of corresponding data. Substituting multiple sets of corresponding data into the salinity inversion model, the values ​​of the above fitting constants are obtained.

[0066] By adding temperature correction terms to the model for grayscale and salinity, the model corrects for salinity fluctuations, seawater transmittance fluctuations, and freshwater baseline concentration fluctuations caused by temperature changes, making the salinity inversion model more accurate. This, in turn, makes the salinity calculated based on the salinity inversion model more accurate.

[0067] Optionally, combined Figure 4 As shown, the experiment on the dynamic evolution of water and salt in an island aquifer under the influence of underground structures includes:

[0068] S201, multiple visible fan-shaped water tank units are spliced ​​together to form an internally interconnected cylindrical water tank; wherein, the interior of each fan-shaped water tank unit is divided into a medium tank located in the inner circle and a seawater tank located in the outer circle, and the medium tank is connected to the corresponding seawater tank.

[0069] S202, fill the medium tank with an aqueous medium to form an aquifer, wherein the aqueous medium is filled with dyed seawater;

[0070] S203, activate the tide generator to deliver dyed seawater into the seawater tank and construct a sinusoidal wave of seawater level fluctuation;

[0071] S204, activate the precipitation simulation system and spray colorless fresh water into the medium tank; after the fresh water seeps into the aquifer, it floats above the seawater and displaces the seawater, thus forming a freshwater lens.

[0072] Multiple visible fan-shaped water tank units are combined into a cylindrical water tank, with the medium tank located in the inner circle and the seawater tank in the outer circle, all secured externally with clamps. Without inserting partitions, adjacent fan-shaped water tank units are interconnected.

[0073] Based on the simulated burial depth and distribution of underground structures, model structures were placed in a medium tank beforehand. Under saturated conditions of dyed seawater, transparent glass beads with an average particle size of 1 mm were layered and compacted in 5 cm increments until the aquifer thickness reached 40 cm. At this point, the aquifer was filled with dyed seawater to simulate the water and salt distribution of an artificial island initially formed. A tide generator was activated, and a peristaltic pump installed in the second water pipe slowly pumped dyed seawater into the seawater tank, creating a sinusoidal wave of sea level fluctuations. Excess seawater flowed out from the overflow outlet. Freshwater infiltrated the aquifer and floated above the seawater, displacing it and forming a freshwater lens.

[0074] Optionally, combined Figure 5 As shown, experimental profile images of the dynamic evolution of water and salt in an island aquifer under the influence of underground structures are collected, including:

[0075] S301, insert a visible partition into the planar sidewalls on both sides of each sector water tank unit to divide each sector water tank unit into an independent unit;

[0076] S302, each independent sector-shaped water tank unit is separated, and in the experimental darkroom environment, matrix lights of the same size are set on the back of each sector-shaped water tank unit.

[0077] S303 uses an image acquisition module to photograph the cross-section of the fan-shaped water tank unit until the simulation system reaches a steady state.

[0078] Impermeable, visible partitions are inserted into the cavities of the planar sidewalls on both sides of each fan-shaped water tank to seal the fluid within the aqueous medium. Then, the external fixing clamps are opened, disassembling the tank into multiple independent fan-shaped water tank units. In a darkroom environment (shielding from outdoor light interference), LED matrix lights of the same size as the water tank are installed on the back of each fan-shaped water tank unit (ensuring uniform light intensity). A high-resolution digital camera (24 megapixels or greater) is used to photograph the cross-section of each fan-shaped water tank unit, recording the image every 10 minutes. If, within a second preset time period, the maximum change in the brackish water interface is less than or equal to a preset range, the simulation system is considered to have reached steady state, and the recording stops. Optionally, the second preset time period is 10 minutes, and the preset range is 1 mm.

[0079] Optionally, combined Figure 6 As shown in Figure S105, based on the salinity inversion model, experimental profile image, and global experimental temperature, a two-dimensional salinity distribution data field is generated, including:

[0080] S115, convert the experimental profile image into a grayscale image;

[0081] S125, Select the medium tank as the target area and extract the gray value matrix of the target area;

[0082] S135, substitute the global temperature and gray value matrix of the target area into the salinity inversion model, and calculate the salinity element by element.

[0083] The captured cross-sectional color images of the dynamic evolution experiment were imported into MATLAB software, and the RGB color images were converted to grayscale images. To eliminate interference from non-medium elements such as the tank border and plexiglass blocks, the area containing the medium tank was selected as the target region in the image. The grayscale matrix of the target region was then extracted. The grayscale value ranges from 0 to 255, representing the light intensity from black to white.

[0084] global temperature of the experiment The temperature was acquired by a temperature sensor located in the middle of the medium tank. The overall experimental temperature was recorded. Substituting these terms into the expressions for each correction term, we obtain the correction terms for this experiment:

[0085] ;

[0086] ;

[0087] ;

[0088] Then the grayscale matrix of the target region Substituted into the salinity inversion model, the salinity is calculated pixel by pixel:

[0089] ;

[0090] Through the above steps, the grayscale value matrix of the entire profile is directly converted into a salinity value matrix that includes global temperature correction, generating an accurate two-dimensional salinity distribution data field.

[0091] Optionally, the salinity distribution data field can be visualized as a pseudo-color image using MATLAB's pcolor function (color levels correspond to salinity 0-34 g / L), generating a salinity distribution map, which can then clearly show the shape, range, and internal salinity gradient of the freshwater lens.

[0092] Based on this salinity distribution map, the following key evaluation indicators were further calculated: the volume of the freshwater lens (the volume of the area with salinity less than 1 g / L), and the distance from the brackish water interface (50% salinity isoline) to the bottom of the tank (focusing on the left, middle, and right boundaries of the profile). The calculation method is existing technology and will not be described in detail here.

[0093] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0094] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Furthermore, the terminology used herein is for descriptive purposes only and is not intended to limit the claims. Without further limitations, an element defined by the phrase "comprising a…" does not exclude the presence of additional identical elements in the process, method, or apparatus that includes said element. Throughout this document, each embodiment may emphasize differences from other embodiments, and similar or identical parts between embodiments may be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant details may be referred to the description of the method section.

[0095] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0096] The methods and products disclosed in the embodiments herein (including but not limited to devices and equipment) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0097] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for simulating the evolution of water salinity in an island aquifer under the influence of an underground structure, characterized in that, The method comprises the following steps: A standard dyeing seawater is prepared by using NaCl and carmine; the standard dyeing seawater is diluted in proportion to prepare saturated sand column standard samples with different salinity gradients, and profile images are collected; The average gray value of the target area in each profile image and the global temperature and salinity of the corresponding saturated sand column standard sample are extracted; The average gray value, global temperature and salinity of the corresponding saturated sand column standard sample are fitted to establish a global temperature coupled salinity inversion model; wherein the establishment of the global temperature coupled salinity inversion model comprises: constructing a salinity inversion model by using the temperature correction term of gray value and salinity; ， wherein, is the salinity of the target region in g / L; is the grey value; is the temperature; is the correction term for temperature on the salinity-grey scaling coefficient; is the correction term for temperature on the salinity-grey curvature coefficient; is the correction term for temperature on the background salinity of the analog system; The average gray value, global temperature and salinity corresponding to the saturated sand column standard sample are substituted into the salinity inversion model to obtain the fitting constant contained in 、 and ​ An experimental profile image and an experimental global temperature of the water and salt dynamic evolution experiment of the island aquifer under the influence of underground structures are collected; wherein the water and salt dynamic evolution experiment of the island aquifer under the influence of underground structures comprises: a plurality of visible fan-shaped water tank units are spliced and combined into a cylindrical water tank with internal communication; wherein the inside of each fan-shaped water tank unit is divided into a medium tank located in the inner ring and a seawater tank located in the outer ring, the medium tank is in communication with the corresponding seawater tank; the medium tank is filled with water-containing medium to form an aquifer, wherein the water-containing medium is filled with dyed seawater; a tide generating device is turned on to deliver dyed seawater to the seawater tank and construct a sinusoidal seawater level fluctuation; a rainfall simulation system is turned on to spray colorless fresh water into the medium tank; after the fresh water infiltrates into the aquifer, it floats above the seawater and displaces the seawater to form the fresh water lens; the collection of the experimental profile image of the water and salt dynamic evolution experiment of the island aquifer under the influence of underground structures comprises: The visible partition plates are inserted into the plane side walls on both sides of each fan-shaped water tank unit to divide each fan-shaped water tank unit into an independent unit; each independent fan-shaped water tank unit is split, and an equal-size matrix lamp is arranged on the back of each fan-shaped water tank unit in a darkroom environment; the profile of the fan-shaped water tank unit is photographed by using an image acquisition module until the simulation system reaches a steady state; According to the salinity inversion model, the experimental profile image and the experimental global temperature, a two-dimensional salinity distribution data field is generated.

2. The method for simulating the evolution of the water salinity of a sea island aquifer under the influence of a subterranean structure according to claim 1, characterized in that, The preparation of the saturated sand column standard sample comprises: The same water-containing medium and standard dyeing seawater as used in the water and salt dynamic evolution experiment of the island aquifer are selected to prepare a plurality of saturated sand column standard samples with different seawater salinity; The plurality of saturated sand column standard samples are placed in different constant temperature environments for a first preset time period.

3. The simulation method of the water and salt evolution of the island aquifer under the influence of underground structures according to claim 1, characterized in that wherein, and are fitting constants used to correct for temperature-induced amplitude of salinity fluctuations; wherein, and are fitting constants to correct for temperature-induced light transmission of dyed seawater; wherein, and are fitting constants used to correct for temperature-induced errors in the fresh water reference concentration.

4. The simulation method of the water and salt evolution of the island aquifer under the influence of underground structures according to claim 1, characterized in that If the maximum change amplitude of the salt and fresh water cross section is less than or equal to a preset amplitude within a second preset time period, it is determined that the simulation system reaches a steady state.

5. The method for simulating the evolution of the water salinity of a sea island aquifer under the influence of a subterranean structure according to any one of claims 1 to 4, characterized in that, The generation of the two-dimensional salinity distribution data field according to the salinity inversion model, the experimental profile image and the experimental global temperature comprises: The experimental profile image is converted into a gray value image; Select the medium tank as the target area, and extract the gray value matrix of the target area; The experimental global temperature and the gray value matrix of the target area are substituted into the salinity inversion model to calculate the salinity.

6. The method for the simulation of the evolution of the water salinity of a sea island aquifer under the influence of a subterranean structure according to any one of claims 1 to 4, characterized in that, The method further comprises: The two-dimensional salinity distribution data field is visualized in a pseudo-color map to generate a salinity distribution map, showing the morphology, range and internal salinity gradient of the freshwater lens; An evaluation index is calculated based on the salinity distribution map.

7. A simulation system for salt evolution of water in an island aquifer under the influence of underground structures, applied to the experiment of salt dynamic evolution of water in an island aquifer under the influence of underground structures according to any one of claims 1 to 6, characterized in that, It comprises: A seepage tank comprises a plurality of visible partitions and a plurality of visible fan-shaped water tank units connected in communication, the visible partitions being pluggable on both sides of the fan-shaped water tank units to enable the fan-shaped water tank units to be combined into a cylindrical water tank in internal communication or separated into independent units; each fan-shaped water tank unit is separated into a fan-shaped medium tank and a seawater tank located at the outer periphery of the circular arc of the medium tank, and the medium tank and the seawater tank are in communication; A rainfall simulation system is located on the water outlet side of the top of the medium tank and is used to deliver freshwater to the medium tank; A tide generating device is located on the water outlet side of the seawater tank and is used to deliver seawater to the seawater tank.

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