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CN-122016571-A - Experimental device and experimental method for simulating migration and transformation of coastal aquifer pollutants under influence of gate-controlled river

CN122016571ACN 122016571 ACN122016571 ACN 122016571ACN-122016571-A

Abstract

The invention discloses an experimental device and an experimental method for simulating the migration and transformation of coastal aquifer pollutants under the influence of a gate-controlled river, the system comprises a simulated water tank divided into a land-source surface-underground runoff generation area, a gate-entering river-coastal aquifer simulation area and a nonlinear tidal signal generation area from left to right, a land-source surface-underground runoff simulation system, a pollutant simulation system, a simulated sluice system positioned in the gate-entering river-coastal aquifer simulation area, a nonlinear tidal simulation system connected with the nonlinear tidal signal generation area, a tidal-gate linkage system used for associating gates and tides, a pollutant monitoring system used for in-situ monitoring on coastal reservoirs and adjacent aquifer pollutants, and a camera system used for shooting the coastal aquifer pollutant migration and conversion process under the influence of the gate-entering river in the experimental operation process. The invention can qualitatively and quantitatively simulate the migration and transformation process of pollutants.

Inventors

  • XU JING
  • MO YUMING
  • CHEN XIAOGANG
  • LI LING

Assignees

  • 扬州大学

Dates

Publication Date
20260512
Application Date
20260304

Claims (10)

  1. 1. The experimental device for simulating the migration and transformation of the coastal aquifer pollutants under the influence of the gate-controlled river is characterized by comprising a simulated water tank (1) which is divided into a land-based surface-underground runoff generation area (110), a gate-controlled river-coastal aquifer simulation area (111) and a nonlinear tidal signal generation area (112) from left to right through a full-water-permeable partition plate (103), a land-based surface-underground runoff simulation system (2) which is communicated with the land-based surface-underground runoff generation area and is used for simulating the process of supplying the underground water side radial flows, a pollutant simulation system (3) which is used for carrying out fixed-point quantitative input on the pollutants of the underground aquifer and a surface river channel, a simulated water gate system (4) which is positioned in the gate-coastal aquifer simulation area, a nonlinear tidal simulation system (5) which is connected with the nonlinear tidal signal generation area (103), a tidal-gate system (6) which is used for associating a gate with a tide, a pollutant monitoring system (7) which is used for carrying out in-situ monitoring on the coast and the pollutants of the adjacent aquifer, and a camera shooting process of the coastal aquifer pollutants under the gate-controlled river in the experimental operation process.
  2. 2. The experimental facility for simulating the transfer of coastal aquifer pollutants under the influence of a gate-controlled ocean-going river according to claim 1, wherein the land-based surface-to-underground runoff simulation system (2) comprises a surface water simulation system (201) and a land-based underground replenishment system (202), the surface water simulation system (201) comprises a storage platform (206), a surface water storage tank (203) which is positioned on the storage platform (206) and stores deionized water simulating surface water, a high-flow variable frequency pump (204) with a water inlet connected with the surface water storage tank (203), and a water delivery pipeline (205) connecting a water outlet of the high-flow variable frequency pump (204) and a surface water inlet (106) of the land-based surface-to-underground runoff generation zone (110), and the land-based underground replenishment system (202) comprises a groundwater storage tank (207) storing deionized water simulating ground water, a BW100 type peristaltic pump (208) with a water inlet connected with the groundwater storage tank (207) through a transparent hose (209), and a transparent hose (209) connecting a water outlet of the BW100 type peristaltic pump (208) and a water inlet of the underground aquifer (107) of the land-based surface-underground runoff generation zone (110).
  3. 3. The experimental facility for simulating the transfer of coastal aquifer pollutants under the influence of a gate-controlled river as claimed in claim 1, wherein the pollutant simulation system (3) comprises a first standard solution tank (301) for storing a first colored pollutant solution and simulating the release of organic oil-like pollutants, a second standard solution tank (302) for storing a second colored pollutant and simulating the release of nutrient-rich domestic sewage or agricultural non-point source pollutants, a third standard solution tank (303) for storing a third colored pollutant and simulating the release of high salinity plumes of variable density chemical pollutants, a first BW100 peristaltic pump (304) with a water inlet connected to the first standard solution tank (301), a second BW100 peristaltic pump (305) with a water inlet connected to the second standard solution tank (302), a third BW100 peristaltic pump (306) with a water inlet connected to the third standard solution tank (303), and a layer pollutant injection probe (307) inserted into the inside of the coastal aquifer simulation water tank (1).
  4. 4. The experimental device for the migration and conversion of the coastal aquifer pollutants under the influence of the simulated gate-controlled river in claim 1, wherein the simulated sluice system (4) comprises an on-gate riverway device (401), a sluice chamber component (402) and a porous energy dissipation guard (403) which are sequentially arranged from left to right, the on-gate riverway device (401) comprises a riverway groove body (4011), water permeable holes (4012) uniformly distributed on the riverway groove body (4011), stainless steel gauze (4013) positioned on the inner wall of the riverway groove body (4011), stainless steel sliding rails (4015) positioned at the bottom of the riverway groove body (4011), a waterproof adjusting sliding plate (4014) connected with the stainless steel sliding rails (4015) and a flexible water stop rubber sleeve (4016) positioned at the tail end of the riverway groove body (4011) and in sealing connection with the sluice chamber component (402), and the sluice chamber component (402) comprises a sluice pier body (4021) with a flow passage arranged in the middle, a gate body (4022) embedded in the center position inside the riverway groove body (4021), a plurality of sluice pier body (4022) and a plurality of standard water stop guard (40232) positioned at the right end of the sluice chamber component (402) and the porous energy dissipation guard (40232) are arranged on the surface of the porous energy dissipation guard (40232.
  5. 5. The experimental facility for the transfer and conversion of coastal aquifer pollutants under the influence of a simulated gate-controlled ocean-going river according to claim 1, wherein the nonlinear tidal simulation system (5) comprises a simulated seawater tank (509), a first water pump (501) connected with a water outlet of the simulated seawater tank (509) and serving as a constant-flow water inlet pump and connected with a small-caliber water inlet and outlet (108) of the simulated water tank (1) and injecting water into the simulated water tank at a constant flow rate, a second water pump (502) connected with a large-caliber water inlet and outlet (109) of the simulated water tank (1) through a water pipe, a flow regulating valve (503) arranged on a pipeline between the large-caliber water inlet and outlet (109) and the second water pump (502), a horizontal main gear (504) horizontally arranged at the top end of a valve rod of the flow regulating valve (503), an input transmission shaft (506) coaxially arranged with the input vertical gear (505) and an output shaft (506) connected with the input transmission shaft (506), a water level sensor (508) arranged for driving a water level sensor (511) and a pressure sensor (510) arranged in the water level sensor (511), the main controller (511) is based on a target tidal level profile The voltage signal for controlling the driving motor (507) is solved and transmitted to the driving motor (507) through a transformation signal generator (508).
  6. 6. The experimental apparatus for simulating the transfer of coastal aquifer pollutants under the influence of a gated ocean-going river of claim 5, wherein the main controller (511) in the nonlinear tidal simulation system (5) is configured to determine a target tidal level curve Solving a voltage signal for controlling a driving motor (507), and specifically solving the voltage signal in the reverse direction as follows: In a nonlinear tidal signal generation zone (112) of an analog flume (1), a first water pump (501) is provided at a constant flow rate Continuously injecting water, and enabling a second water pump (502) to discharge water at a required flow rate through a flow regulating valve (503) Discharging water body, regarding the simulated water tank as the sectional area Is a limited volume of water body corresponding to a target water level curve Time differentiation is carried out, and the drainage flow required at each moment is calculated The calculation formula is as follows: , The required valve rotation angle is calculated: , , Wherein the method comprises the steps of Integrated flow characteristic function for pump-valve system Is the inverse of the pump-valve system integrated flow characteristic function Pre-establishing through a system calibration experiment; For the obtained Performing time differentiation to obtain the required valve rotation angular velocity: , Taking into account gear ratios , To input the pitch radius of the vertical gear (505), For the pitch radius of the horizontal main gear disk (504), the required angular speed of the motor is: , according to the electromechanical characteristic equation of the direct current motor, the relationship between the angular speed of the motor and the terminal voltage is as follows: , Wherein the method comprises the steps of Is the rotation speed constant of the motor, For the resistance of the armature, Is the load current; The driving motor (507) is controlled according to the voltage signal The polarity of which controls the rotation direction and the rotation speed according to the voltage amplitude; The water level sensor (510) collects the actual water level in real time And transmitted to the main controller (511), the main controller (511) compares the actual water level with the target water level, and calculates the water level deviation: , And real-time correction is carried out on the pre-calculated voltage signal based on a PID feedback control algorithm: , Wherein the method comprises the steps of 、 、 Respectively a proportional coefficient, an integral coefficient and a differential coefficient.
  7. 7. The experimental device for the migration and transformation of coastal aquifer pollutants under the influence of a simulated gate-driven river according to claim 5, wherein the tide-gate linkage system (6) comprises a vertical transmission shaft (601) with the bottom end coaxially arranged with a horizontal main gear disc (504), a horizontal driven gear turntable (602) positioned at the top end of the vertical transmission shaft (601), a variable-speed vertical gear set (603) with any gear vertically meshed with the horizontal driven gear turntable (602), a top transverse transmission shaft (604) for penetrating the variable-speed vertical gear set (603), a stainless steel frame (605) for erecting the top transverse transmission shaft (604), a hub (606) penetrating the top transverse transmission shaft (604) through a swelling sleeve (607), steel strands (608) wound on the hub (606) and a water blocking baffle (609) positioned at the tail end of the steel strands (608) and capable of opening and closing a gate of the simulated sluice system (4).
  8. 8. An experimental setup for the transfer of coastal aquifer pollutants under the influence of a simulated gate-driven river according to claim 1, characterized in that the pollutant monitoring system (7) comprises a sampling hole (701) located at the back of the simulated sink (1), a sensor arrangement hole (705) located at the back of the simulated sink (1), a pollutant sensor (702) located in the sensor arrangement hole (705), a pollutant data processor (703) connected to the pollutant sensor (702), a display (705) connected to the pollutant data processor (703).
  9. 9. The experimental facility for the migration and transformation of coastal aquifer pollutants under the influence of a simulated gate-driven river according to claim 1, wherein the camera system (8) comprises a high definition camera (801) positioned on the front side of the simulated flume (1), a computer (802) connected to the high definition camera (801), a light shielding curtain (803) surrounding the camera and the simulated flume, and a lighting fixture positioned directly above the simulated flume.
  10. 10. An experimental method for simulating an experimental device for the migration and transformation of pollutants in a coastal aquifer under the influence of a gate-controlled river, which is characterized by comprising the following steps: s1, screening white quartz sand according to experimental requirements, preparing simulated seawater in a simulated seawater tank (509) by deionized water and industrial salt according to mass ratio, and fully stirring until the simulated seawater is completely dissolved for later use; S2, filling white quartz sand into a gate-control sea-entering river-coastal aquifer simulation area (111) in a water saturation mode, ensuring that the water level is always higher than the sand surface in the filling process, filling water while filling sand in layers, installing a gate-on-river device (401) in the gate-control sea-entering river-coastal aquifer simulation area (111) according to an experimental design, fixing a river channel body (4011) above the simulation water channel (1) through an angle adjusting bracket (4013), enabling a water permeable hole (4015) at the bottom of the river channel body (4011) to be downward in contact with the aquifer, adjusting the position of a water-impermeable adjusting slide plate (4012), controlling the length range of the water permeable area to be 40cm to 100cm according to experimental requirements, adjusting the inclination angle of the river channel body (4011), installing a gate chamber component (402) at the downstream end of the river channel body (4011), sealing and connecting a gate pier main body (4021) with a flexible water-stopping rubber sleeve (4016), and fixing a porous energy-dissipating plate (403) at an interface (4021) at the downstream side of the gate pier main body (4023); S3, respectively injecting deionized water into a surface water storage tank (203) and a ground water storage tank (207), respectively preparing standard pollutant solutions into a first standard solution tank (301), a second standard solution tank (302) and a third standard solution tank (303), inserting a pollutant injection probe (307) into a simulation water tank (1), and adjusting the tip position of the probe to be near an upstream, a midstream or a downstream interface of the aquifer according to experimental design; S4, injecting prepared simulated seawater into a simulated seawater tank (509), starting a first water pump (501), and regulating the flow to a constant value And starting the second water pump (502), and the main controller (511) is used for controlling the water pump according to the target tidal water level curve Solving a voltage signal for controlling a driving motor (507), transmitting the voltage signal to the driving motor (507) through a voltage transformation signal generator (508), fixing one end of a steel strand (608) in a spiral groove of a hub (606) and driving an input vertical gear (505) to rotate according to the voltage signal, further, driving a flow regulating valve (503) to change in opening degree through gear engagement to change the actual drainage flow of a second water pump (502), observing whether the water level in a nonlinear tide signal generating area (112) shows periodic fluctuation or not, ensuring that the water level change amplitude meets the design requirement, selecting a proper gear in a variable speed vertical gear set (603) according to the experimental requirement to be engaged with a horizontal driven gear turntable (602), setting different mechanical transmission ratios, fixing the other end of the steel strand (608) in the spiral groove of the hub (606), connecting the other end of the steel strand with the top of a water retaining partition plate (609), adjusting the length of the steel strand (608) to enable the lower edge of the water retaining partition plate (609) to be a certain distance away from the bottom of a river channel groove (4011), starting the voltage transformation signal generator (508), setting waveform parameters, ensuring that the water level change and lifting motion can synchronously move, verifying that when the tide change and tide change, the flow regulating valve (503) rises, the water retaining valve (503) and the water retaining valve (503) rises, and the sluice gate (609) is closed when the tide change valve (609) is opened; S5, installing a pollutant sensor (702) in a sensor layout hole (705) on the back of the simulation water tank (1) according to an experimental design, leading out a cable of the pollutant sensor (702) through a threading hole on the back of the simulation water tank (1) and connecting the cable to a pollutant data processor (703), connecting the pollutant data processor (703) with a display (704), setting data acquisition frequency, displaying pollutant concentration change curves of all monitoring points in real time, erecting a high-definition camera (801) on the front of the simulation water tank (1), adjusting focal length to enable the whole gate-controlled sea river-coastal aquifer simulation area (111) to be in a visual field range, uniformly arranging a lighting lamp plate right above the simulation water tank (1), connecting the high-definition camera (801) to a computer (802) through a data line, building a shading curtain (803) around the simulation water tank (1), enclosing the high-definition camera (801), a lighting lamp and the simulation water tank (1), and creating a darkroom environment; S6, starting a land source surface-underground runoff simulation system (2), injecting surface runoffs with designed flow into a river channel tank body (4011) through a large-flow variable-frequency pump (204), injecting underground runoffs with designed flow into an underground aquifer water inlet (107) through a BW100 type peristaltic pump (208), simulating a land source hydrologic process, starting a nonlinear tidal simulation system (5), starting a first water pump (501) and a second water pump (502), controlling a driving motor (507) to operate through a variable-pressure signal generator (508), generating designed nonlinear tidal waveforms, enabling a small-caliber water channel water inlet and outlet (108) and a large-caliber water channel water inlet and outlet (109) to work simultaneously, forming periodic water level fluctuation in a nonlinear tidal signal generation area (112), starting a pollutant simulation system (3), selecting a first BW100 type peristaltic pump (304), a second BW100 type peristaltic pump (305) or a third BW100 type peristaltic pump (306) according to experimental design, injecting pollutants into the aquifer or designed positions of the aquifer or the designed positions through a pollutant injection probe (307), and recording water sample solution in the same-collecting position of the water channel (701) at the same time after the river channel flow, the underground runoff and the tidal waveforms are stably operated for a period of time, and the water sample filling the pollutants are completely and completely-filled in the water sample layer: s6.1, under the condition that the nonlinear tide simulation system (5) and the tide-gate linkage system (6) are not started, after the water level in the simulated water tank (1) is stable, recording an initial reference water level And the background concentration of each monitoring point Wherein For the spatial coordinates of the contaminant sensor (702) in the gated ocean-going river-coastal aquifer simulation zone (111), For a horizontal distance from the land-side boundary, , For the vertical height from the bottom of the tank, ; S6.2, starting a land surface-underground runoff simulation system (2), recording input flux, injecting surface runoff with designed flow into a river channel groove body (4011) through a large-flow variable-frequency pump (204), and recording the input flow of the surface runoff Groundwater with designed flow is injected into a water inlet (107) of an underground aquifer through a BW100 peristaltic pump (208), and groundwater supply flow is recorded After the river channel flow, the underground runoff and the water level fluctuation of the aquifer stably run, the next step is carried out; S6.3. starting a nonlinear tide simulation system (5), recording tide water level time sequence, starting a first water pump (501) and a second water pump (502), controlling a driving motor (507) through a variable-voltage signal generator (508) to generate nonlinear tide waveforms, arranging a water level sensor (510) in a nonlinear tide signal generation area (112), and recording tide real-time water level time sequence ; S6.4, starting a tide-gate linkage system (6), recording gate state parameters, and recording the gear mechanical transmission ratio set by the current experiment Measuring the movement displacement of the water baffle (609), and recording the time sequence of the opening of the gate in real time And calculating the gate status function based thereon : , Simultaneously recording the moment of switching the gate from closed to open in each tidal cycle And the moment of switching from on to off Calculating a single cycle gate opening duration ; S6.5, starting a pollutant simulation system (3), recording injection parameters, selecting a first BW100 type peristaltic pump (304), a second BW100 type peristaltic pump (305) or a third BW100 type peristaltic pump (306) according to experimental design, inserting a pollutant probe (307) into a simulation water tank (1) according to a design position, and recording pollutant injection flow And injection concentration Injection position coordinates are ; S6.6, continuously operating the experiment for a period of time, and synchronously collecting the following parameterized data: the river water level is recorded in a time sequence of the river water level in the variable-permeability river channel body 4011 ; Pollutant concentration field pollutant sensor (702) collects pollutant concentration of each monitoring point A pollutant data processor (703) and a display (704) display concentration-time curves in real time, respectively calculate the spatial average concentration of the sensors in the river channel And the spatial average concentration of the sensor in the aqueous layer ; The salinity distribution is that the conductivity of each monitoring point is synchronously collected by a pollutant sensor (702) and converted into salinity The method is used for identifying the interface position of the salty and fresh water; The pollutant plume optical image is obtained by taking the front image of the aquifer simulation area (111) by a high-definition camera (801) at regular time intervals to obtain the space distribution gray scale field of the dyed pollutant Converting gray values into two-dimensional density fields Contaminant concentration based on contaminant sensor (702) acquisition Correcting the concentration field obtained for an optical image ; In the experimental operation process, the following key exchange flux is estimated on line according to the collected water level data: riverway-aquifer osmotic exchange flow rate, namely, river water always permeates downwards in one direction through riverbed medium to supply aquifer because the riverway water level is always higher than the aquifer groundwater level Constant positive value, and according to Darcy's law, the vertical permeation exchange flow rate of river channel to aquifer is: , Wherein, the Is the permeability coefficient of the river bed, Is the effective permeation area of the bottom of the river channel contacted with the aquifer, Is the thickness of the permeable layer of the river bed, Is the elevation of the bottom plate of the river channel, Becomes the water level of the river channel in the water-permeable river channel body (4011); Gate leakage flow, namely calculating according to a gate hydraulics formula: , Wherein, the For the clear width of the gate, For the real-time water level of the tide downstream of the sluice, Gravitational acceleration; S7, after the experiment is finished, all collected data are arranged, quantitative analysis of the migration and conversion of the coastal aquifer pollutants under the influence of the gate-controlled river is carried out, and all pollutant sensor data are unified to the same time standard For the concentration time series Carrying out median filtering denoising; Establishing a gate-controlled river-coastal aquifer coupling dual-region mass conservation equation set, dividing a gate-controlled river-coastal aquifer system into two coupling subsystems of a river region and a coastal aquifer region, and respectively establishing a pollutant mass conservation equation: River region conservation of mass equation: , Coastal aquifer region mass conservation equation: , Wherein the method comprises the steps of Is the river channel water volume; is the volume of the aquifer; Is the average pollutant concentration of the river channel, For the average contaminant concentration of the aquifer, The flow is input into the ground surface, Inputting the pollutant concentration for the surface; The flow is supplied for the groundwater, For the concentration of the pollutants in the groundwater, Exchanging flow for the permeation of river-aquifer; The flow is discharged for the gate; As a function of the state of the gate, To drain the flow to the sea for the aquifer, For the invasion flow of seawater into the aquifer, For the concentration of the seawater contaminant, In order for the porosity to be the same, For the injection of the pollutants into the river channel flow, For the injection of contaminants into the aquifer flow, For injection contaminant concentration; the change rate of the pollutant quantity in the river channel along with time is used; for the flux of contaminants carried in by surface runoff, The pollutant flux taken away by the aquifer is supplied for river water infiltration, The flux of contaminants discharged for the gate opening bleed, Injecting tracer pollutant flux into the river channel in the experiment; for the rate of change of the amount of contaminant in the aquifer pore water over time, Is porosity; The carried pollutant flux is supplied to the ground source groundwater, For the flux of pollutants carried by river water penetrating into the aquifer, To excrete the carried-away contaminant flux to the sea side for the aquifer, The flux of pollutants brought by seawater invasion into the aquifer, Injecting a flux of tracer contaminant into the aquifer during the experiment; By passing through The method realizes the coupling of two subsystems of a river channel and an aquifer, wherein the river channel region is a source of pollutants, the aquifer region is a sink, and the gate status function The total amount of pollutants entering the aquifer is indirectly regulated and controlled by controlling the leakage flux.

Description

Experimental device and experimental method for simulating migration and transformation of coastal aquifer pollutants under influence of gate-controlled river Technical Field The invention relates to the technical field of hydraulic engineering, in particular to an experimental device and an experimental method for simulating the migration and transformation of coastal aquifer pollutants under the influence of a gate-controlled river. Background The coastal region is used as a junction zone of land and ocean water circles, and the water circulation process is extremely complex. In order to meet the demands of flood control and drainage, light storage and tide blocking, most of the sea estuaries are built with tide blocking gates. The natural hydrodynamic condition of the river is artificially changed by the construction of the sluice, namely, the water level is raised to form a weak hydrodynamic environment when the sluice is closed, and the water level is suddenly lowered and the flow rate is suddenly increased when the sluice is opened. The severe artificial fluctuation not only changes the exchange relation between surface water and underground water, but also causes severe space-time variation of salinity in a river channel by controlling seawater tracing, thereby deeply affecting the density flow field and geochemical environment in the coastal aquifer. Unlike inland rivers, the inland river is doubly constrained by upstream runoff and downstream tides, and gate scheduling has extremely strong tidal relevance. In practical engineering, the gate opening and closing usually follows the phase coupling rule of falling tide, opening gate, discharging flood, rising tide, closing gate and blocking salt. This gating pulse mechanism, which dynamically varies with tide, results in severe and discontinuous stepped fluctuations in the river water level, whose phase difference relative to the tidal peaks and valleys varies from estuary characteristics. This particular hydrodynamic process changes the hydraulic gradient of the seashore aquifer and produces an important driving effect on the migration and conversion of contaminants in the seashore aquifer. Inversion of the process of transferring and transforming the coastal aquifer pollutants through indoor experiments is an important means of research. However, most of the existing devices pay attention to seawater invasion under the action of simple sine tides (such as CN115266521B, CN 113405830B), the generation of tides is required to be carried out by installing a complex portal frame system and damaging the ground of a laboratory (CN 105241804A), the opening and closing process of a river gate into which the tides are tightly coupled is not simulated, the dual effects of water level mutation and salinity fluctuation caused by gate control cannot be reproduced, and the influence of the dual effects on the process of the migration and transformation of pollutants in a coastal aquifer is difficult to be truly reflected. Disclosure of Invention The invention aims at providing an experimental device for simulating the migration and transformation of the coastal aquifer pollutants under the influence of a gate-controlled river, and the experimental device can qualitatively observe the nonlinear tides, the different gate opening and closing amplitudes and the tracing characteristics of the migration and mixing of the coastal zone groundwater and salt water interface under the influence of a gate response mode. The second purpose of the invention is to provide an experimental method for simulating an experimental device for the migration and transformation of the pollutants in a coastal aquifer under the influence of a gate-controlled river, which is used for quantitatively measuring the fluctuation of pore water pressure and the salinity space-time distribution of characteristic positions of the aquifer in the tidal-sluice linkage process, and establishing the response relation of sluice regulation parameters (gear ratio), groundwater supply flux and seawater invasion distance under the nonlinear tidal boundary condition. According to the technical scheme, the experimental device for simulating the migration and transformation of the coastal aquifer pollutants under the influence of the gate-controlled river-entering current comprises a simulated water tank, a land surface-underground runoff simulation system, a pollutant simulation system, a simulated sluice system, a nonlinear tidal simulation system, a tidal-gate linkage system, a pollutant monitoring system and a camera shooting system, wherein the simulated water tank is divided into a land surface-underground runoff generation area, a gate-entering current-to-coastal aquifer simulation area and a nonlinear tidal signal generation area through a full-water-permeable partition plate from left to right, the land surface-underground runoff simulation system is communicated with the land surface-underground runoff g