77 results about "Flume" patented technology

The invention relates to a local washout test method for a single-column composite barrel type foundation under an actual wave current condition. The method comprises the following steps: acquiring basic data of a target wind power plant area; determining a scale, and constructing a reduced scale physical model water tank according to similar conditions; parameters of the first two-way pump, the second two-way pump and the wave maker are determined through adjustment and measurement; excavating a test scour area, installing a reduced-scale single-column composite cylindrical foundation, and laying model sand; and carrying out a scouring test until scouring is balanced, recording the scouring depth and the scouring range, and converting the scouring depth and the scouring range into prototype quantities. According to the method, the superposition effect of actual rotating tidal current and waves in a sea area can be well simulated, the scouring form conforming to the sea area site is simulated, and therefore the local scouring condition of the single-column composite barrel type foundation under the actual wave current condition can be accurately judged.

The invention relates to a long water tank mobile surface flow field measurement method, which comprises the following steps: utilizing a river channel local scouring experiment model, the model is a water tank, and the middle part of the water tank is provided with a vertical support rod for simulating a building component; a constant-speed motion traction camera device is built above a water tank, so that a mobile camera moves at a constant speed at a certain inclination angle, meanwhile, water flow in the water tank is shot, and a water flow surface flow field is obtained through calculation according to a shooting result. The method comprises the following steps: performing perspective transformation processing on an obtained image to obtain a continuous front view image, identifying checkerboard control points to position each frame of corrected image, and cutting a tracer particle image by using coordinates of intelligent identification side wall control points. After surface tracer particles are extracted through a morphological method, flow field splicing is carried out on instantaneous flow fields at different moments to obtain a surface flow field in a large range, the problems that traditional fixed flow field measurement is low in precision and small in range are effectively solved, and an effective technical means is provided for hydraulic structure research and water body monitoring.

The invention relates to the technical field of fluid dynamics experimental measurement, and discloses a water tank experimental device and method for muddy current transportation of micro-plastics, the device comprises a water tank device main body, an optical measurement subsystem and an ultrasonic Doppler flow velocity measurement system, an ultrasonic emission path and an optical measurement window are overlapped in space, and the optical measurement subsystem and the ultrasonic Doppler flow velocity measurement system are arranged in the water tank device main body. The method comprises the following steps: performing first fluorescence labeling and second fluorescence labeling on the micro-plastic particles and the sediment particles; synchronously acquiring optical data and acoustic data in the cross window; respectively establishing a concentration correction function and a flow velocity correction function by taking acoustic backscattering intensity data and flow velocity data as references in the cross window; applying the correction function to the whole optical window to obtain a globally corrected concentration field and a globally corrected flow velocity field; and distinguishing and quantifying the micro-plastics and the sediments based on the corrected data. Through the cross correction principle, the problem of signal distortion of optical measurement in high-turbidity fluid is solved.

A multifunctional circulating flume test device and method for simulating riverbank slope damage under scouring and seepage effects belongs to the field of hydraulic engineering technology. Its water supply system includes pipelines, a water supply tank, a water pump, a leveling tower, and a drainage trough for providing water flow and drainage. The flume system includes a water intake trough, an energy dissipator, a circulating flume, a limiting module, and a tailgate for providing water flow channels and riverbank plasticity. The filtration system includes a filter pool, filter plates, and baffles for filtering and settling particles in the water and providing circulating water flow. The support system includes an adjustable support for supporting the entire circulating flume and providing slope. This invention overcomes the shortcomings of existing flume devices in simulating riverbank collapse tests due to fixed river morphology and limited functionality. It can simulate the scouring and damage process of straight riverbanks and study the scouring and damage process of concave and convex banks under varying bend conditions, providing theoretical and technical support for ecological bank protection engineering design and riverbank disaster prevention and mitigation. It can meet the multifunctional needs of scientific research and engineering practice.

The present invention discloses a device and method for simulating the water flow and sedimentation process in a river channel in an arid area. The simulation device comprises an experimental water flume, a river channel simulation component, a first water tank, and a second water tank. At least one drainage outlet is provided at the downstream end of the experimental water flume. The river channel simulation component is arranged in the experimental water flume, and comprises a first simulation layer and a second simulation layer stacked in sequence in an up-down direction. The first simulation layer is paved with finely crushed walnut shells and has a channel with a water inlet near the upstream end and a water outlet near the downstream end. The second simulation layer is paved with gravel. The first water tank is filled with water and is connected to the water inlet of the channel through an inlet pipe. Part of the water flowing into the channel flows to the downstream end, and the other part seeps into the second simulation layer. The second water tank is connected to the drainage outlet of the experimental water flume through the outlet pipe. In this way, the process of the width and depth of a river channel in an arid area decreasing as it moves downstream can be simulated.

The invention relates to a wave flow water tank test device and method for impact of a solitary wave on a deep sea wind power jacket foundation structure, and the device comprises a water tank, a solitary wave generation device, a wave dissipation grid, a wave height meter, a pressure sensor, a high-speed camera, a jacket foundation model, a cement platform base, and a data collection device. The solitary wave generating device is arranged in the front-end concrete section, the jacket foundation model is installed in the middle test section through the cement platform base, the wave dissipation grid is arranged in the rear-end concrete section, and a plurality of wave height meters are arranged on the front side of the jacket foundation model and used for monitoring the wave height of the head wave face of a jacket. A plurality of pressure sensors are uniformly arranged on the jacket basic model and are used for measuring the wave force borne by the local structure of the jacket; the wave height meters and the pressure sensors are electrically connected with the data acquisition device. The device and the method can effectively simulate and measure the impact effect of different forms of solitary waves on the deep and far sea wind power jacket model.

The present invention discloses an irrigation channel flow measurement device, which relates to the field of flow measurement technology. The present invention comprises a mounting base, a Parshall flume, and an ultrasonic flowmeter. The Parshall flume is fixedly mounted in the mounting base, and the ultrasonic flowmeter is mounted on the Parshall flume via a mounting rod. The present invention also comprises an interception plate, which is rotatably mounted on the Parshall flume via a rotating rod, and the interception plate is tilted backward from the upstream contraction section of the Parshall flume to the short straight throat section. An impact detection assembly is installed between the rotating rod and the Parshall flume, and the impact detection assembly is used to detect the impact force of the water flow on the interception plate. The advantage is that the present invention can automatically complete the dredging of the interception plate and the Parshall flume according to changes in the water flow rate and the changes in the water impact force on the interception plate, which can effectively improve the accuracy of water flow measurement. At the same time, it can also ensure the water discharge speed when the water flow rate is large, ensuring the stability of the device during flood discharge.

The present invention relates to the technical field of Parshall flume flow measurement, and in particular to a complete Parshall flume flow measurement device. The present invention provides a complete Parshall flume flow measurement device capable of adjusting the width of the throat in the Parshall flume, facilitating measurement of water velocity data at different throat widths. A complete Parshall flume flow measurement device comprises a protective cover, a flume body, a primary motor, a tail differential plate, and a central plate, etc. The upper sides of the left and right parts of the flume body are both connected to protective covers, the inner sides of the front and rear parts of the flume body are both rotatably connected to multiple tail differential plates, a central plate is rotatably connected between adjacent tail differential plates, and the upper sides of the left and right parts of the flume body are both connected to a primary motor. The present invention uses a primary motor to drive a gear set, which drives a force transmission helical gear to move, thereby controlling the operation of the tail differential plate and the central plate, thereby adjusting the width of the throat in the Parshall flume and facilitating measurement of water velocity data at different throat widths.

The utility model discloses a test water tank outlet water depth control system, which is characterized by comprising a gate valve device arranged at a water tank outlet, a water depth detection device and a water depth gate valve control circuit, the gate valve device comprises a gate plate vertically arranged at an outlet of the water tank, a rotatable threaded rod is upwards arranged on the upper surface of the gate plate, the upper end of the threaded rod is matched with a nut which is limited up and down in a screwed mode, teeth are arranged on the outer surface of the nut, and a driven gear is formed on the outer ring of the nut and meshed with the driving gear. The driving gear is mounted on a main shaft of a water depth motor; the water depth gate valve control circuit is connected with the water depth motor and used for controlling the gate plate to move downwards or upwards. The device can automatically detect the water depth condition at the outlet of the water tank, controls the size of the water outlet through the lifting of the flashboard, achieves the constant control of the water depth, can be conveniently used in a water tank test (a moving bed water tank test) with silt erosion and deposition changes so as to control the constant water depth condition, and finally improves the reliability of a test result.

This invention proposes an experimental apparatus for simulating solute migration and transformation in a heterogeneous riparian subsurface flow zone. The apparatus includes: a riparian simulation tank comprising several identical plexiglass components A and two identical plexiglass components B, wherein the left end of plexiglass component A is a dynamic head flume simulating river water, the middle part is a sand flume simulating a portion of the riparian subsurface flow zone, and the right end is a constant head flume simulating groundwater; a water level control system including a water supply component, a drainage component, and a water level control component; and a pore water sampling system including several water sample collection components buried within the sand flume. Compared with existing technologies, this invention, by increasing the number of plexiglass components A and filling their sand flumes with different types of sand to simulate the three-dimensional heterogeneity of riparian sediments, combined with the water level control and pore water sampling system, can study the spatiotemporal evolution of solute migration and transformation in the heterogeneous riparian subsurface flow zone and its influence on solute migration and transformation in the subsurface flow zone.

The utility model provides a kind of assembly type torrent chute assembly, it is related to torrent chute technical field, including torrent chute body, torrent chute body is set to slope, and water channel is provided in torrent chute body;Baffle is configured as multiple interval settings in water channel, multiple baffles are respectively connected with the bottom wall and side wall of water channel, and pouring groove for pouring concrete is formed between baffle and the bottom wall and side wall of water channel.The utility model sets up interval multiple baffles in water channel, and each baffle is respectively limited with the bottom wall and side wall between water channel to form pouring groove, and the concrete in multiple pouring grooves can form water fall in water channel after solidification, avoid to support formwork in water channel alone and gradually cast-in-place concrete, improve construction efficiency, the connection stability of baffle and torrent chute body is good, improve the structural stability of torrent chute assembly, to prolong the service life of torrent chute assembly.

This invention provides a slope scour simulation test device based on soil particle staining tracers, comprising: an adjustable slope scour section connected downstream of a water supply unit, including a slope flume and a slope adjustment component at its bottom; the slope flume contains, from bottom to top, a concrete layer, transparent test particles, and tracer particles; and a data acquisition and analysis unit for acquiring test data under different working conditions, including test condition data and image sequences of the adjustable slope scour section, identifying and tracking tracer particles of different sizes in the image sequences, and outputting the motion parameters and initiation parameters of the tracer particles. By combining the test condition data under multiple working conditions and the corresponding motion and initiation parameters of the tracer particles, the device quantitatively characterizes the initiation, migration, and deposition mechanism of slope particles under runoff-seepage coupling. This invention can simulate slope scour under runoff-seepage coupling conditions, accurately recording and analyzing the motion behavior of slope particles under different working conditions.

The present invention discloses an indoor test method for scour protection of pile foundation solidified soil, comprising: erecting a transparent model pile in a grit chamber of a water flume, laying a soil layer around the model pile; placing an ADV flow velocity sensor in front of the model pile and a video recorder inside the model pile to record flow velocity data and image data during the test; preparing solidified soil; slowly injecting water into the water flume until a corresponding water level is reached, adjusting the water flume flow generating equipment to ensure that the water flow reaches a designed flow velocity, and scouring the soil until a scour pit develops in equilibrium at the corresponding flow velocity; blowing solidified soil into the scour pit according to the range and depth of the scour pit; observing and measuring the development of scour during the solidified soil curing process until the scour pit develops in equilibrium, and recording the scour depth and scour range at each measuring point around the model pile. The present invention overcomes the drawback that on-site testing cannot fully meet the requirements of research work for environmental conditions, test conditions, and test accuracy.

An experimental device and method for measuring a motion probability of nonuniform sediment are provided. The method includes: dyeing sediment of different particle sizes to obtain nonuniform dyed sediment, sticking sediment with the same grades to the bottom of a flume to form a rough plate; soaking the nonuniform dyed sediment, laying the nonuniform dyed sediment on the sediment feeder, transporting the sediment by water with given intensity, and once the flow is stable, starting the sediment feeder to perform a test until the sediment stops moving. Collecting, drying and sieving the sediment in the bedload collector and the suspended load collector, and weighing the dyed sediment of different particle sizes. Computing the incipient probability and the suspension probability respectively by measuring the weight ratios of the sediment of different grades from the two collectors to the initial ones.

The present invention relates to the field of electromagnetic detection and provides a method for detecting wake electromagnetic field enhancement based on a circulating water flume. The method comprises: constructing a wake electromagnetic field test device based on a circulating water flume, fixing a model to be tested in the flow channel of the circulating water flume; placing a Helmholtz coil outside the circulating water flume to generate an enhanced background magnetic field; periodically changing the rotational speed of a drive device, thereby periodically changing the water flow velocity in the circulating water flume; measuring the electric and magnetic fields in the target area; and processing and analyzing the obtained signals.

This utility model discloses a water measurement and monitoring device for open channels in siltation irrigation areas, belonging to the field of water conservancy equipment technology. It includes a measuring flume body, a siltation detection component, a water volume monitoring unit, and multiple vibration units. The measuring flume body, with a double-layer structure and open ends, is located on the inner wall of the channel, and the width direction of the flume body is consistent with the width direction of the channel. The siltation detection component is located at the top of the measuring flume body, facing towards the bottom of the flume body, and its siltation detection element can reciprocate along the width direction of the flume body. The water volume monitoring unit is arrayed on the inner wall of the measuring flume body for monitoring the channel water level. Multiple vibration units are fixed within the interlayer space of the measuring flume body, with some working end faces of each vibration unit abutting against the inner wall of the measuring flume body on the side closest to the channel. This not only reduces the error in water delivery volume due to the degree of siltation but also improves the accuracy of the measurement data.

The present invention discloses a multi-functional flume system for a dual-channel eco-hydraulics test, comprising: a reservoir; a flume filtering and flow measuring section provided on the upstream side of the reservoir; a flume body section provided upstream of the flume filtering and flow measuring section; two flume energy dissipation sections; a flume water inlet section provided below the upstream top end of the flume body section; a rotary vane type controllable tailgate provided near the downstream end of each channel of the flume body section; a flume water outlet section provided downstream of the rotary vane type controllable tailgate; a test material feeding device, comprising a rigid connection pipe, a check valve, a test material feeding bin, and a flexible connection pipe connected in sequence, wherein a pressure pump is provided in the flexible connection pipe; a programmable logic controller, whose output terminals are respectively connected to the input terminals of the rotary vane type controllable tailgate, the pressure pump, an electromagnetic valve, and a variable frequency centrifugal pump, and the input terminal of an electromagnetic flowmeter is connected to the output terminal of the programmable logic controller.

An experimental sand tank for simulating dynamic evolution of river-groundwater hydraulic connection belongs to the technical field of groundwater simulation experiment devices and comprises a simulation sand tank, a river simulation box, a circulating water tank, a river water level control device, a groundwater water level control device, a water pressure monitoring probe, a pressure measuring drain, a data acquisition and processing device and a computer. The river water level and the groundwater water level on both sides of the aquifer are adjusted, and the monitoring data of the water pressure monitoring probe, the pressure measuring drain and the first to fourth flow water meters are combined, so that the process of dynamic evolution of river-groundwater hydraulic connection under various experimental conditions can be simulated, the law of dynamic evolution of river-groundwater hydraulic connection can be analyzed, and scientific reference basis can be provided for development and sustainable utilization of regional groundwater resources.

The utility model belongs to the technical field of water conservancy projects, and particularly relates to an oval density stratified gutter channel which comprises a gutter channel bottom frame, an oval gutter channel body is arranged on the gutter channel bottom frame, a flow dividing channel is arranged in the oval gutter channel body, a supporting rod is arranged at the upper end of the flow dividing channel, a stratified flow assembly I is arranged on the supporting rod, and a stratified flow assembly II is arranged on the stratified flow assembly II. A first layered flow assembly is arranged on the supporting rod, a second layered flow assembly is arranged on the supporting rod, the second layered flow assembly is arranged on one side of the first layered flow assembly, the first layered flow assembly comprises a first motor, the first motor is arranged on the supporting rod, a driving shaft is arranged at the output end of the supporting rod, and the driving shaft is sleeved with nylon blades; by arranging the first layered flow assembly and the second layered flow assembly, on one hand, saline water in the oval water flowing groove is layered, and on the other hand, the saline water in the oval water flowing groove circularly flows.

The invention discloses a hydrodynamic sediment physical model experiment method for simulating variable tide level combined wave action. The method comprises the following steps: building a physical model experiment system comprising an experiment water tank, a tide level simulation system, a wave generation system and a measurement system; determining a model tide level process and a wave element sequence according to the prototype environment data; calibration of control parameters of the tide level simulation system is carried out in an empty water tank state, and calibration of control parameters of the wave generation system is carried out according to different water depths and wave elements; after a bottom bed model is laid, the two systems are operated synchronously, the water level changes dynamically, corresponding waves are generated, and variable tide level and wave combined action simulation is achieved; and hydrodynamic force and bed topographic data are collected through the measuring system for analysis. Accurate combined simulation of dynamic sea level change and wave action is achieved, the sea level simulation system is simple in structure, low in cost and easy to install and control, the simulation precision of the complex water and sediment movement process is improved, and an economical and reliable experimental means is provided for coast engineering research.

The utility model relates to the technical field of water diversion aqueducts, and discloses a reinforcing mechanism for a high and large aqueduct in a deep water area, the reinforcing mechanism comprises a fixed beam and two moving tables, a first sliding groove is formed in the fixed beam, a two-way screw rod is rotatably connected in the first sliding groove, and a rotating handle is rotatably arranged on one side of the two-way screw rod; first threaded holes are formed in the two sliding blocks in a penetrating mode, and clamping plates are fixedly connected to one sides of the upper ends of the two moving tables. The reinforcing mechanism for the high and large aqueduct in the deep water area can be adjusted according to the actual size and shape of the aqueduct, the structure of the device is relatively simple, the connection mode between components is clear, installation and maintenance are easy, meanwhile, due to the fact that the number of the components is relatively small, the fault occurrence probability and the maintenance cost are reduced, and the service life of the aqueduct is prolonged. The reinforcing mechanism for the high and large aqueduct in the deep water area has the advantages of being efficient in adjustment and fixation, high in stability and adaptability, easy to install and maintain, safe, reliable and the like.

The invention discloses a pier scour prediction method and system based on a single-beam sonar and water tank experiment, and the method comprises the steps: carrying out the quantitative evaluation of a pier position in a navigable river channel, and selecting a pier with the highest comprehensive scour risk as a monitoring object; acquiring field flow field parameters; setting a pier model and a riverbed scene in the water tank, and carrying out a water tank scouring experiment; detecting the section of a scouring pit on the upstream side of the pier after the water tank scouring experiment, and obtaining a curve shape from the pit bottom to an edge transition area; extracting water tank scouring experiment data, and constructing a training data set; training a pre-established pier scouring curve prediction model by adopting the training data set; and acquiring field real-time data and inputting the field real-time data into the trained pier scour curve prediction model to obtain a pier scour prediction curve. According to the method, a small number of sonar sensors are installed on actual piers to monitor the depth of the scouring pit, and calculation and prediction of the section curve of the scouring pit of the multiple piers of the actual bridge are achieved in combination with a prediction model trained through a water tank model experiment and a data driving method.

The invention relates to the technical field of dredging engineering tests, and provides a dredged soil dumping disposal evaluation method based on an indoor test, which comprises the following steps: constructing an indoor simulation test system comprising a test water tank, a dredged soil dumping device and a monitoring system, and monitoring the diffusion concentration of suspended sediment in the dumping test process in real time through the monitoring system; after the dredged soil is poured, dredged soil stacking height images at different positions are shot; performing visual angle correction and image splicing on the obtained dredged soil stacking height image, and analyzing the deposited sediment stacking height and the remaining amount of dredged soil dumping disposal and the diffusion concentration of suspended sediment in a surrounding water area under a specified construction working condition based on the obtained suspended sediment diffusion concentration and sediment stacking height distribution; by combining the ecological function and the use function of the construction water area, the potential influence of the deposited sediment remaining amount and the suspended sediment diffusion on the construction surrounding water area is analyzed. Scientific assessment is provided for the influence of dredged soil dumping disposal on the terrain change and water environment of the dumping area.

A method for monitoring and calculating the rainfall collection effect of transmission towers includes the following steps: constructing a rainfall trough; constructing a diversion trough; constructing a measuring trough; installing a Parshall flume; installing a rigid frame, an ultrasonic probe, and a flow meter; calculating the catchment level; calculating the catchment flow rate; calculating the equivalent rainfall intensity; and calculating the rainfall collection effect. This invention provides a method for monitoring and calculating the rainfall collection effect of transmission towers, capable of calculating equivalent rainfall intensity and rainfall collection effect, filling the gap in the lack of indicators and calculation methods for quantifying the rainwater collection effect of transmission towers.

The invention discloses a two-dimensional wave-water flow numerical water tank building method based on an ISPH method and adding a wave absorption area and application, and adopts a method of combining the ISPH method with a sponge layer wave absorption theory and a modified k-epsilon turbulence model to build a wave-water flow combined action two-dimensional numerical water tank model. Accuracy and applicability verification is carried out on the two-dimensional numerical water tank model through the propagation process of waves on the coral reef section, the change of the wave height along the reef and the change hydrodynamic characteristics of the horizontal flow speed, and hydrodynamic characteristic change analysis is carried out after coral reef area composite engineering activities. And / or the method is used for analyzing the influence of breakwater construction on the coral reef terrain hydrodynamic environment under the condition of the regular wave and water flow coupling effect. The simulation result of the numerical model after the k-epsilon turbulence model improved by adopting the wave absorption theory and coupled and corrected is well matched with the experimental result of the physical model, and the problem that the kinetic energy index of turbulence in the potential flow area is increased before the waves are broken is obviously improved compared with that of a traditional method.

The application discloses a large water body eutrophication rapid treatment method and a special system thereof, and comprises a harbor type net enclosure captive breeding salvage unit, a water level self-adaptive cutting pump suction unit, a flume self-flow transportation unit and a solid-liquid separation resource unit. The method absorbs pollutants through net enclosure captive breeding purification organisms, and the whole net is dragged to a shore-based still water harbor by a tugboat during salvage. The organisms enter a cutting bin through a water level self-adaptive gate and the net is recovered synchronously. After the organisms are cut and broken into slurry, the slurry is lifted to an overhead flume by a cutter suction pump, and is self-flowed to a solid-liquid separation bin by gravity. Finally, the slurry is dewatered through filter pipe seepage, anaerobic fermentation and enhanced pressure filtration, so as to realize resource utilization of biogas, organic fertilizer and irrigation water. The application has very strong treatment capacity, is ecological friendly, has very low energy consumption and cost, and can rapidly improve the water quality of a large water body from poor V class to I-II class.

The present application relates to the field of structural deflection monitoring, and particularly relates to a high and large flume deflection monitoring method based on static level, which comprises a monitoring device and a flume midspan deflection acquisition method using the monitoring device; the monitoring device comprises a flexible static level tank and a liquid level observer; the flexible static level tank is laid on the top of a straight wall section on one side of a target flume, and water is stored in the flexible static level tank; three measuring points are arranged on the flexible static level tank, and the three measuring points are respectively located at the support and the midspan of the target flume; each measuring point is provided with a liquid level observer; the flume midspan deflection acquisition method comprises the following steps: calculating the rigid body displacement δ1 of the target flume midspan, calculating the relative displacement δ2 of the target flume midspan and one end support, δ = δ2- δ1, and the bending deformation δ is the midspan deflection; compared with the prior art, the present application is less affected by uneven ground subsidence, has smaller error, higher precision, and is convenient to operate and maintain.

The invention discloses a non-connected river ecological calculation method, and belongs to the field of river ecological calculation, and the method comprises the steps: simulating river environments in different connected states through constructing a multifunctional experiment water tank system, and collecting hydrodynamic force, water quality and biological multi-dimensional parameters; establishing a hydrodynamic force-water quality-water ecology coupling model to realize synchronous calculation of physical, chemical and biological processes; a non-connectivity index is innovatively proposed, and river non-connectivity features are quantified from four dimensions of longitudinal, transverse, vertical and time. According to the method, the defects of a traditional method in the aspects of dynamic water environment simulation, multi-dimensional non-connectivity representation and multi-process coupling are overcome, the transportation-retention process of the phosphorus element under the conditions of manual intervention and rainfall runoff can be accurately analyzed, and a reliable technical means is provided for ecological influence assessment of channel improvement engineering and river ecosystem management.

The embodiment of the invention provides a method and device for determining the limit depth of stroke of a riverbed, electronic equipment, a computer readable storage medium and a computer program product. The method for determining the riverbed limit stroke depth comprises the steps that the initial water and sediment condition of a target river reach is obtained; based on the initial water and sediment conditions, determining the riverbed limit depth of the target river reach when the target river reach reaches a preset balance condition by utilizing a preset limit depth of stroke calculation rule; wherein the preset balance condition is that the sediment scouring thickness and the sediment deposition thickness of the riverbed reach dynamic balance; and pushing the limit depth of the riverbed to a user terminal. By utilizing the method disclosed by the embodiment of the invention, the dynamic process of'formation-damage-reconstruction 'of the coarsened protective layer can be reflected by calculating the ultimate scouring condition of the damage of the protective layer on the surface of the riverbed and the transportation of the deep bed sand, so that the applicability and the reliability of the scheme in a natural river and / or water tank test can be improved, and the calculation precision can also be improved.

The application discloses a two-dimensional wave-current numerical flume construction method based on an ISPH method and addition of a wave absorbing area and application. k-ε The method combines the ISPH method, the "sponge layer" wave absorbing theory and a modified k-ε turbulence model to construct a two-dimensional numerical flume model of wave-current interaction, and verifies the accuracy and applicability of the two-dimensional numerical flume model through the wave propagation process on the coral reef profile, the wave height change along the reef and the variation of the hydrodynamic characteristics of the horizontal flow velocity, and is used for analyzing the change of the hydrodynamic characteristics of the coral reef area after composite engineering activities, and / or used for analyzing the influence of the construction of a breakwater on the hydrodynamic environment of the coral reef topography under the condition of the coupling action of regular waves and water flow. The simulation result of the numerical model after the wave absorbing theory is improved and coupled with the modified k-ε turbulence model is in good agreement with the experimental result of the physical model, and the problem of the exponential growth of the turbulence kinetic energy index in the potential flow area before wave breaking is obviously improved compared with traditional methods.