243results about "Hydraulic models" patented technology

The invention discloses a riverway three-dimensional water flow numerical simulation method, and relates to the technical field of intelligent water conservancy simulation, and the method comprises the steps: generating a longitudinal long and narrow hexahedral mesh of a main riverway in a C gradient direction through employing a mucous network growth algorithm, and outputting a hexahedral mesh with a shear layer identifier; turbulence viscosity coefficient distribution is dynamically initialized through a DDPG reinforcement learning model, and turbulence parameters are output; inputting the hexahedral mesh with the shear layer identifier and turbulence parameters into a coupling solver, performing parallel numerical solution, and outputting transient flow field data; a lambda 2 criterion is adopted to identify a vortex core area and calculate a vorticity modulus, a transverse circulation is defined, an on-way distribution cloud picture is generated, an immersive VR scene is constructed through a Unity 3D engine, and a three-dimensional visual water flow simulation scene with a physical feature label is output. Through fusion of lambda2 criterion vortex identification and a Unity 3D visualization technology, a complete solution with both calculation precision and engineering practicability is provided for river flow simulation.

A method and system for determining a limit scouring state of riverbed in downstream river channel of a reservoir group are provided. The method includes: collecting discharge data and cross-sectional prototype observation data of the downstream river channel of the reservoir group; establishing a correlation between discharge and a sediment carrying capacity indicator of a cross-section of a controlled hydrological station; calculating variation of the sediment carrying capacity indicator corresponding to dominant discharge; and determining and verifying the limit scouring state of the riverbed in the downstream river channel of the reservoir group. The method determines the limit scouring state of the riverbed in the river channel, and verifies the preliminary screening results based on the cross-section changes with the above determination, so as to provide technical support for mastering the development process of riverbed scouring and scouring trend prediction in the dam downstream river channel of the reservoir group.

The invention discloses a large-scale immersed tube tunnel silt squeezing simulation device and method, the large-scale immersed tube tunnel silt squeezing simulation device comprises a large-scale immersed tube model, a truss structure, a gear rack structure, two supports and a model groove, the truss structure is fixed on the top of the large-scale immersed tube model, and a balancing weight is placed on the truss structure; two sealing rubber strips are respectively arranged on the periphery of the large-scale immersed tube model; in the process of lowering the large-scale immersed tube model in the model tank, one end of the large-scale immersed tube model rubs with the side wall of the model tank to form a closed end, the other end of the large-scale immersed tube model forms a sludge discharge end, and an ultrasonic flow meter is arranged at the sludge discharge end; a stay wire displacement sensor is fixed on each bracket, two fixed ends are arranged at the top of the large-scale immersed tube model, and a fixed head of each stay wire displacement sensor is fixed on one fixed end; a gravel layer, a back-silting float sludge layer and a seawater layer are sequentially arranged in the model groove from bottom to top, and a sea groove slope model is arranged in the model groove.

The invention discloses a dam leakage detection method and system based on an unmanned aerial vehicle and deep learning. The method comprises the following steps: acquiring dam surface image data through the unmanned aerial vehicle carrying image acquisition equipment; preprocessing the obtained dam surface image data; performing feature extraction and fusion on the preprocessed image data based on a deep learning model to obtain a multi-modal coupling feature image related to the leakage area; performing target detection on the multi-modal coupling feature image to identify a leakage area; and carrying out spatial positioning on the identified leakage area to determine a positioning coordinate of the leakage area. Dam leakage is detected by combining the unmanned aerial vehicle technology and the deep learning algorithm, the automation and intelligence level of detection is improved, manual intervention and errors are reduced, and the detection precision and efficiency are improved.

The invention discloses a device for simulating influence of ditch cleaning ice cover evolution on hydrodynamic parameters and an application method thereof, and relates to the technical field of ice water dynamics and hydraulic engineering experiments. The device comprises a low-level water tank, a high-level water tank, a centrifugal pump, a flow valve, a water tank, a steady-flow perforated plate, a ditch cleaning ice cover simulation device, a first water level control grid plate, a second water level control grid plate and a flow field measurement system. According to the invention, three key parameters of ditch cleaning length, ice cover submerging water depth and roughness of the bottom of the ice cover are independently regulated and controlled, and non-contact high-precision measurement is carried out by means of a PIV technology, so that systematic and refined research on hydrodynamic parameters of an ice cover ditch cleaning area is realized. According to the method, researchers can safely and systematically research the influence of a single variable on the ice cover ditch cleaning water power at low cost, and the fundamental bottleneck of traditional field measurement in the research is solved.

The invention discloses a reservoir dam leakage intelligent detection device, and the device comprises a soil hardness detection module which is used for determining a detection point according to the axis of a dam and the type of a dam body filling material; the grid division module is used for dividing the corresponding region into grid structures with associated sizes through the soil hardness mean value of the same region; the detection strategy matching module is used for determining a leakage detection strategy corresponding to the grid structure according to the soil hardness; the leakage detection module is used for detecting the leakage flow velocity of each grid in the grid structure according to the determined leakage detection strategy and determining the leakage state of each grid according to the leakage flow velocity; and the prediction module is used for predicting the leakage state of the grid according to the historical leakage data to obtain the duration required for deterioration of the leakage state of the corresponding region. According to the method, grids are reasonably divided according to the hardness of soil, so that detection is more detailed and comprehensive, potential leakage points can be accurately found, and the precision and reliability of leakage detection are improved.

The invention discloses a deepwater bidirectional flow generation system, which relates to the technical field of pool flow field simulation and comprises a pool body and a bidirectional flow generation device. The bidirectional flow making device comprises a plurality of bidirectional flow making assemblies which are stacked in the depth direction of the pool body; the bidirectional flow making assembly comprises a plurality of circulating pipes; the plurality of circulating pipes are arranged in an array in the same horizontal plane perpendicular to the depth direction; each circulating pipe is connected with the pool body to form a circulating pipeline; a two-way water pump is mounted on each circulating pipe; and a steering flow guide structure is mounted at the corner position in each circulating pipe. According to the design, the problems of non-uniform flow field distribution and small effective area in a traditional mode are effectively avoided, and the same quality of flow fields in two directions can be ensured in bidirectional flow generation. And the steering flow guide structure is used for conducting flow guide at the corner position, and the problem of huge energy loss caused by a pressure perforated wall in a traditional mode is solved.

The invention relates to the technical field of rapid dike rescue, in particular to a method for establishing a rapid blocking model for a dike breach, and the method comprises the steps: obtaining a water flow trend vector to determine a feature side slope, obtaining a side slope profile curve of the feature side slope, and determining a burst trend sub-vector based on a deformation feature point to determine a burst trend characterization vector; determining a breach deformation offset parameter and a breach deformation expansion parameter according to the comparison condition of the real-time burst trend sub-vector and the burst trend characterization vector so as to judge whether a breach contour prediction abnormal risk exists or not, determining a prediction error category of the breach contour loss in response to the existence of the breach contour prediction abnormal risk, and determining the breach contour loss prediction error category. According to the method and the device, the blocking model is established, and the acquisition optimization mode established by the model is determined, so that when the embankment breach appears, the deviation of the blocking model establishment is rapidly identified according to the actual form of the slope at the embankment breach, the acquisition optimization mode established by the model is adaptively adjusted, and the reliability of the rapid blocking model is improved.

The invention discloses a device for testing the stress-seepage coupling anti-permeability characteristic of a dam foundation soil body of an anti-seepage wall. The device comprises a test box, a loading system, a seepage system and a monitoring system, a groove is formed in the wall of the test box and used for embedding the rigid diaphragm wall model, and the space between the groove and the diaphragm wall model is filled with a flexible water stop material to ensure sealing. The loading system is of a double-flexible-water-bag structure, and uniform vertical stress is applied to soil bodies on the two sides of the diaphragm wall. The seepage system applies hydraulic gradient from the water inlet end through the water supply device, so that water flow horizontally passes through the soil body and the diaphragm wall model. The monitoring system comprises pore pressure sensors arranged in an array mode and a water outlet surface vertical strip-shaped through hole observation window, and the pore water pressure distribution and the seepage damage phenomenon are monitored in real time. Through series innovative design, the limitation that only seepage model test can be carried out on the suspension type diaphragm wall dam foundation in the prior art is overcome, and a brand-new test platform is provided for researching a diaphragm wall dam foundation stress-seepage coupling anti-seepage mechanism.

The invention discloses a parallel control fish passing test platform, which belongs to the field of fishway engineering, and comprises a physical layer used for constructing n parallel fish passing channels with consistent bottom slopes, forming a shared entrance boundary at an upstream end and a shared exit boundary at a downstream end in sequence, and implementing a control test under a single variable condition; and the software layer is in communication connection with the physical layer and is used for carrying out initialization, boundary condition setting, real-time control, data acquisition, data processing and visual display on the physical layer. According to the test platform, simultaneous and synchronous test conditions are provided for the fish releasing test in the hydraulic model, it can be guaranteed that the operation working condition, the indoor environment and the feeding condition are the same in the fish releasing test research process, and the defects that migration behaviors are different due to the fact that ecological behavior characteristics of migratory fishes are prone to being stressed by the indoor environment are overcome; the fishway hydraulic model test result is perfected, and the fishway engineering design of the hydro-junction is guided.

The invention provides a navigation engineering simulation channel dredging device and a simulation method, and belongs to the technical field of channel dredging. A navigation engineering simulation channel dredging device comprises a shell and further comprises a channel simulation box, the channel simulation box is arranged in the shell and used for simulating a channel to be dredged, a sludge layer is laid at the bottom of the channel simulation box, and a telescopic pipe is arranged between the channel simulation box and the inner wall of the shell; the leveling assembly is arranged in the shell and is used for leveling a dredged sludge layer in the channel simulation box; the dredging assembly is arranged on the shell and used for dredging the sludge layer; the shell is provided with a moving mechanism used for driving the dredging assembly to move. By eliminating the interference of the water body on the sludge, the situation that the sludge is turbid in the water body and needs to stand for a long time is avoided, the core problems of low efficiency and non-visual data in a traditional simulation experiment are solved, and a high-fidelity and high-efficiency experiment tool is provided for channel dredging engineering.

The utility model belongs to the field of hydraulic model tests, and discloses a hydraulic model test flow stabilizing device which comprises a measuring weir, the inlet end of the measuring weir is connected with a measuring weir forebay, the outlet end of the measuring weir is connected with a terrain forebay, and the other end of the measuring weir forebay is internally connected with a water supply pipeline. And water in the terrain forebay enters the test terrain through the steady flow lattice wall. According to the utility model, the phenomenon of unstable inflow caused by unstable incoming flow in a hydraulic model test with a small required flow is improved.

The invention discloses a three-dimensional wave flow test harbor basin system, relates to the field of ocean infrastructure engineering test equipment, and aims to solve the problem that complex ocean conditions cannot be truly reproduced. The system comprises a wave making pool, a current making mechanism, a wave making mechanism, a wave absorbing mechanism and a crane mechanism, the flow making mechanism comprises a flow making pump, a flow outlet, a flow inlet and a circulation corridor, the flow outlet and the flow inlet are both communicated with the wave making pool and the circulation corridor, and the flow making pump and the circulation corridor are both located below the wave making pool; the wave making mechanism comprises a transverse wave making device and a longitudinal wave making device which are mounted in the wave making pool, the transverse wave making device and the longitudinal wave making device are respectively provided with an upper layer and a lower layer, and the transverse wave making device and the longitudinal wave making device are vertically arranged; the wave absorbing mechanism is circumferentially arranged and is adjacent to the inner side wall of the wave making pool; the crane mechanism stretches across the wave making pool and is used for hoisting an experimental model.

The invention discloses a vegetation model and plastic blind ditch combined composite wave absorbing device which comprises a square supporting amplitude modulation frame, a lifting mechanism and a vegetation model. The square supporting amplitude modulation frame comprises a bottom support, a block-shaped plastic blind ditch plate arranged on the bottom support, two guide sliding rails arranged on the two sides of the top of the block-shaped plastic blind ditch plate correspondingly, and a porous net-shaped vegetation fixing grid arranged between the two guide sliding rails. A plurality of plug-in type grooves are formed in the porous net-shaped vegetation fixing grids, vegetation strips are inserted into the plug-in type grooves to form a vegetation model, one end of the bottom support is connected with the water tank, the other end of the bottom support is connected with the lifting mechanism, and the lifting mechanism is used for adjusting the angle between the square supporting amplitude modulation frame and the water tank. The vegetation model and the plastic blind ditch plate are combined, reflection waves are reduced through double wave absorption of the vegetation model and the plastic blind ditch plate, and the wave absorption effect is improved.

The embodiment of the application provides a landslide accumulation seepage hysteresis simulation test device, and relates to the technical field of simulation test devices. The landslide accumulation seepage hysteresis simulation test device comprises a transparent test box, a bedrock simulation piece and a water level simulation mechanism. The transparent test box comprises a box body and a box cover, the box cover is installed on the top of the box body, a groove is arranged on the slope surface of the bedrock simulation piece, a landslide body simulation piece is installed in the groove, and the water level simulation mechanism comprises a storage water tank, a first water pump, a first water inlet pipe, a first water outlet pipe, a connecting pipe and a drain pipe. The pressure of the first water pump can be adjusted according to requirements to simulate the rising rate of the water level, so that the state of the landslide body simulation piece can be observed. The second valve is opened, and the first water pump and the first valve are closed. The water source in the box body is discharged through the connecting pipe and the drain pipe, the water level falling rate in the box body is simulated, the state of the landslide body simulation piece when the water level falls is observed, and more test data can be obtained.

The application discloses a kind of mobile underwater layered hydraulic fill construction indoor simulation test method, comprising: step (1) by input module design key test parameters;Step (2) by input module setting water depth, speed and wave conditions;Step (3) by management module mixes uniform mud;Step (4) by management module starts first layer mobile hydraulic fill;Step (5) by management module completes first layer mobile hydraulic fill;Step (6) by management module repeats step (4)-(5);Step (7) by measuring system measures hydraulic fill test characteristic parameter;Step (8) clears up water tank test area silt. Various key construction parameters are adjusted, and multi-layer repeated mobile construction simulation technology is realized, which provides an effective means for in-depth study of high-precision layered hydraulic fill technology, improvement of construction efficiency and management quality.

The invention relates to the technical field of river model experiments, and discloses a refined river model uniform sand adding experiment device, which comprises a sand adding groove, a sand discharging hole, a sand discharging hole, a sand discharging hole, a sand discharging hole and a sand discharging hole, the adjusting part is arranged in the sand adding groove, and the sand adding width of the sand adding groove is adjusted by moving the adjusting part in the sand adding groove; the sand adding assembly comprises a sand adding unit and a moving unit, the moving unit is slidably connected to the top end of the sand adding groove, and the sand adding unit is arranged on the moving unit and used for conveying a water-sand mixture into the sand adding groove; and the control piece is arranged on the sand adding groove and used for controlling the moving unit to reciprocate at the top end of the sand adding groove. Through combination of a mechanical structure and automatic control, uniform distribution of the sand amount in the space in the sand adding process is achieved, the problems that a traditional device is uneven in sand adding, prone to blockage and low in adjusting precision are effectively solved, and the reliability and scientificity of a river model test are remarkably improved.

The invention discloses a ship lock opening operation mode navigation control method which is characterized in that after an opening operation mode is determined, an upstream ship lock and a downstream ship lock are opened to drain water, the water flow velocity is predicted, the time required for the flow velocity to reach a safety threshold value is judged, and when the required time is smaller than a preparation time value, a ship is informed to start navigation preparation; and when the flow velocity reaches a safety threshold, the ship is notified to navigate. The ship navigation time can be predicted in advance after the ship lock is opened, the ship is informed to shorten the response time of the ship, the navigation efficiency is improved, meanwhile, the adopted ship lock opening water flow speed simulation method has the advantage that higher simulation precision can be obtained with less calculation power, and the navigation control accuracy is improved.

The invention provides a side type water inlet / outlet structure arrangement method and device for a pumped storage power station. The side type water inlet / outlet structure arrangement method comprises the steps that (A) design parameters of a water inlet / outlet structure are automatically determined; (B) according to the design parameters of the water inlet / outlet structure and the preliminarily determined axis direction of the water inlet / outlet structure, obtaining each feasible arrangement scheme for arranging the water inlet / outlet structure in the three-dimensional topographic geologic model of the target arrangement area; wherein if the bottom plate (100) of the water inlet / outlet structure and the gate shaft platform (101A) in the arrangement scheme are both completely located on the completely weathered rock stratum of the three-dimensional topographic geologic model, the arrangement scheme is a feasible arrangement scheme; (C) calculating the excavation work amount corresponding to each feasible arrangement scheme in the step (B); and (D) taking the feasible arrangement scheme with the minimum excavation engineering quantity as the selected scheme.

The invention relates to a structure and method for improving the energy dissipation rate of a stepped spillway, and belongs to the field of hydraulic engineering. The method comprises the following steps: establishing a dip-angle-free stepped spillway model, carrying out a gliding flow working condition test, and collecting water flow and energy data; establishing a three-dimensional numerical model, and performing grid independence and physical model verification; processing the data by using an eddy current identification criterion, and identifying an area of the step not covered by the eddy current; lifting the step surface at the starting point of the region to form an upper dip angle structure, and reconstructing a model; and analyzing the energy dissipation rate change of the model after setting the inclination angle, and verifying the influence of the structure on eddy current and energy dissipation. By arranging the local upward inclination angle in the uncovered area of the gliding flow, additional vortexes can be effectively induced, water flow disturbance is enhanced, and the energy dissipation rate is increased. The method is simple in structure and high in adaptability and has a good engineering application prospect.

The invention discloses an automatic tide tank system based on a siphon principle, which relates to the field of ecological simulation and comprises a main tank, a backpack, a low sewer pipe, a siphon device, a negative pressure ingress pipe, a high sewer pipe, a high sewer pipe ball valve and a low sewer pipe ball valve, the knapsack is fixedly connected to the rear portion of the main cylinder and communicated with the interior of the main cylinder, and the low sewer pipe and the high sewer pipe are both vertically placed in the knapsack. The siphon device further comprises a barrel-shaped cavity and a connecting hole, the connecting hole is formed in the bottom of the barrel-shaped cavity, and the barrel-shaped cavity is arranged at the inlet end of the high sewer pipe in a sleeving mode and used for forming a sealable air chamber at the inlet of the high sewer pipe. And the siphon device is fixed at the inlet end of the high sewer pipe through a connecting hole at the bottom. The applicability and customizability of the system are enhanced, and the whole system is simple in structure and high in stability, can efficiently simulate an intertidal zone of a natural sea area and create a tidal hydrological environment, and meanwhile has a good water purification function.

The invention provides a river network-based ecological effect simulation system and a control method thereof. The river network-based ecological effect simulation system comprises a water tank, a connecting pipeline and a water supply device, the water tanks comprise N levels, in the vertical direction, the first height between the first water tank located on the ith level and the horizontal plane is smaller than the second height between the second water tank located on the (i + 1) th level and the horizontal plane, N is an integer larger than 2, i is any integer between 1 and N-1, and the number of the second water tanks is larger than that of the first water tanks; each first water tank is communicated with at least two second water tanks through connecting pipelines, and each second water tank is communicated with the first water tank through an independent connecting pipeline; the water supply device is used for supplying water to the uppermost water tank located on the Nth level or supplying water to the lowermost water tank located on the first level. The river network ecological effect simulation method can realize simulation of the river network ecological effect, and is high in simulation trueness and low in cost.

The invention relates to the technical field of test pools, and particularly discloses a gradient-adjustable offshore slope terrain simulation test pool based on double-platform lifting, which comprises a pool main body, a first platform, a second platform and an inclined panel, a deep pool and a shallow pool which are communicated with each other are arranged in the pool main body along a first direction; the first platform is arranged in the deep water pool in a lifting manner; the second platform is arranged in the deep water pool in a lifting manner; the second platform is located on the side, close to the shallow pool, of the deep pool and located between the first platform and the shallow pool. The first platform is provided with a sliding seat of which the position can be adjusted along a first direction; the first end of the inclined panel is hinged to the side face of the second platform. The second end of the inclined panel is hinged to the sliding base. In the test pool provided by the scheme, through the lifting of the first platform and the second platform, the inclination angle of the inclined panel can be changed under the condition that structural parts do not need to be disassembled and replaced, so that different offshore submarine topography characteristics are adapted, and the operation process is simplified.

The application provides a dam centrifugal test model reservoir water level controllable adjusting device and method, relates to the geotechnical centrifugal model test technical field, and includes a model box. An overburden dam model is arranged at one end in the model box. A placeholder box is arranged at the end away from the overburden dam model in the model box. A guide positioning mechanism is fixedly installed at the bottom end of the model box. When the hydraulic actuator is started and frequently lifted or lowered, the generated vibration is transmitted to the elastic connecting mechanism. The support of the first support platform in the elastic connecting mechanism is matched with the second buffer platform, the second buffer spring and the elastic damping of the movable connecting rod, and the fine adjustment of the third working platform and the precision guide rail pair. The high-frequency vibration transmitted by the hydraulic actuator under high g value is significantly inhibited, water level fluctuation distortion is avoided, and the reliability of test data is improved.

The invention relates to the technical field of test simulation, and discloses an ocean stratum multifunctional in-situ test simulation device which comprises a bottom plate and a box body, a U-shaped frame is fixedly mounted at the top of the bottom plate, the box body is vertically mounted at the top of the bottom plate, and the box body is used for containing soil and seawater of an ocean stratum; the gas tank is mounted on the side surface of the vertical edge of the U-shaped frame; the air inflation mechanism is arranged on the air box and the U-shaped frame, and the air inflation mechanism and the air box are matched to be used for inflating and pressurizing the interior of the box body; the number of the impellers is two, and the two impellers are symmetrically and rotationally arranged on the two sides of the inner wall of the box body; the rotating assembly is arranged on the box body, and the rotating assembly and the impeller are matched to be used for stirring seawater in the box body to flow, so that the real environment of the ocean in-situ test is simulated. According to the device, pressure can be applied to ocean stratum soil during simulation, and seawater in the box body can be automatically disturbed after the box body is sealed, so that an ocean stratum in-situ test is really simulated, and the using effect of the device is improved.

The invention discloses a device and a method for testing influence of river and canal flood on variable slope pipe network drainage and ground surface submerging, and relates to the field of urban flood. A water tank lifting assembly can ascend and descend, and a water tank can move relative to the water tank lifting assembly, so that the gradient of the water tank can be adjusted; the inspection well lifting assembly can ascend and descend and can move so that the gradient of the underground pipe network can be adjusted, the effluent weir comprises a weir plate which can move in the height direction of the testing device, and the weir plate is used for adjusting the water level in the river channel. Therefore, the gradient of the water tank is adjusted through the water tank lifting assembly, the gradient of the underground pipe network is adjusted through the inspection well lifting assembly, and the weir plate is used for adjusting the water level in the canal. The test device can accurately simulate the influence degree of the dynamic change of the water level of the canal on the drainage of the urban variable-gradient pipe network and the range and depth of surface submerging under the combined situation of different surface incoming flows and pipeline incoming flows, and provides decision support for urban flood risk management and urban drainage system design.

The invention discloses a river habitat ecological flow regulation and control device and method based on a multi-objective optimization algorithm, and relates to the technical field of river flow regulation and control. A double-support fixing frame is installed between two lateral confinement baffles, and a plurality of lifting fixing holes are formed in the top end of the double-support fixing frame at equal intervals; a plurality of fixed belt transmission boxes are clamped to the top end of the double-support fixing frame at equal intervals, and transmission motors are installed at the positions, corresponding to input shafts of the fixed belt transmission boxes, of the top end of the double-support fixing frame through motor bases. The drainage position is regulated and treated according to low water and high water, so that the water flow can be stably stored and slowly discharged when the water is low, and can be quickly discharged when the water is high, the overflow condition is avoided, the flow velocity and flow of the water flow are stably regulated and treated according to the actual environment, and the regulation and control effect is ensured.

This invention belongs to the field of hydraulic model technology, and particularly relates to an inlet / outlet hydraulic model, comprising: a reservoir body as a fixed container; perforated bricks set inside the reservoir body as the base filling of the model; variable modules as the framework of the steep slope of the model; PVC plastic pipes forming the framework of the gentle slope of the model; plastic flexible sheets laid on the surface of the variable modules and PVC plastic pipes; and rubber sheets bonded to the outer layer of the plastic flexible sheets. This application adopts modular component assembly, eliminating disposable consumables such as cement and sand, making model construction simpler and laying the foundation for green recycling and efficient production.

The present invention relates to the field of fishway technology, and in particular to a method for the structure, construction, and design of a canal fishway, comprising the following steps: S1: establishing a fishway database at a hub, evaluating the swimming ability of target fish species passing through the fishway, and determining the migratory ecological characteristics of the target fish species; S2: designing a fishway scheme and determining a preliminary design scheme for the fishway structure; S3: designing a physical model of a local section of the fishway project, and conducting a physical model test of the local section of the fishway project to obtain a recommended scheme for the pool chamber structure located upstream of the eel channel in the vertical slot fishway; S4: establishing an overall model of the fishway, and conducting an overall model test of the fishway to determine the overall structural scheme of the fishway. The design method of a canal fishway in the present application provides a theoretical basis for setting up an eel channel suitable for the migration of eels and Hepu mitten crabs and a vertical slot fishway suitable for the migration of red-eyed trout and dace, thereby solving the problem of providing migration channels for eels, red-eyed trout, dace, river perch, Hepu mitten crabs, etc.

The invention relates to a reconstruction method for simulating a local scouring terrain of a bridge pier in a sandpit environment, comprising a bridge pier local scouring experimental model, the bridge pier local scouring experimental model comprises a water tank, gravels are laid at the bottom of the water tank, a vertical support rod for simulating the bridge pier is fixed in the middle of the water tank, and a sunken sandpit area is arranged beside the vertical support rod. An annular track is arranged above the water tank, a mobile camera is arranged on the annular track, a black and white checkerboard is made as a terrain reconstruction control point in the to-be-tested area, and the mobile camera carries out annular shooting in the research area; a PMVS algorithm is adopted, a result of sparse three-dimensional point cloud reconstruction is optimized, then topographic feature analysis of a local scouring bed surface of a pier and quantitative calculation of a pit area are performed when a sand mining pit exists, the method is suitable for a water tank test and a riverbed physical model test, the riverbed three-dimensional topography before and after scouring can be rapidly and efficiently reconstructed, the precision is high, and the method is suitable for popularization and application. And the research of the pier scouring terrain is facilitated.