1467 results about "Sediment" patented technology

The invention discloses a wave-current coupling simulation-based pile foundation wharf sediment erosion and deposition prediction system and method. The system comprises a preprocessing module, a wave-current coupling simulation-based pile foundation wharf sediment erosion and deposition prediction module, a wave-current coupling simulation-based pile foundation wharf sediment erosion and deposition prediction module and a wave-current coupling simulation-based pile foundation wharf sediment erosion and deposition prediction module, the coupler module is used for realizing data synchronization and exchange among various modes through an MCT coupler by adopting a coupling numerical mode technology; the data conversion module is used for converting wave field data and flow field data into a hydrodynamic input file of a pile foundation structure; the FlOW3D module is used for inputting the pile foundation three-dimensional model at the current moment, the hydrodynamic conditions generated through coupling and the sediment parameters obtained after data preprocessing into a configured FLOW3D module program to simulate erosion and deposition of sediment around the pile foundation under the real sea area condition, and the erosion and deposition form of the sediment around the pile at the current moment is obtained; and the visualization module is used for displaying the three-dimensional model of the pile foundation at each moment, the erosion and deposition form of the sediment around the pile and the early warning result in a visualization interface.

The invention discloses an indoor water tank sediment starting speed measurement system and method, and aims to solve the technical problem that data accuracy is affected due to the fact that a sensor disturbs a flow field in an existing measurement method. The core of the technical scheme is that the non-contact measurement characteristic of the PIV technology is applied to the whole process from flow field construction to data acquisition. The device is mainly composed of an imaging unit, a laser lighting unit, a movable sliding frame, a water flow adjusting unit and a buffer plate. Optical measurement is carried out through the imaging unit and the laser illumination unit, a physical sensor does not need to be arranged in a flow field, and interference of a measuring instrument on a water flow structure and a sediment starting process is fundamentally avoided. The movable sliding frame which is integrally designed integrates the functions of sediment laying, particle throwing and measuring, so that a test area can be quickly positioned; and the buffer plate and the water inlet and drainage adjusting unit are combined, so that a gradually-changed flow field from weak to strong can be accurately and stably simulated.

The invention discloses a geological survey whole-process data aggregation system for ancient marine environment evolution, and relates to the technical field of marine geological survey. The data management platform is in communication connection with a data acquisition module, a data preprocessing module, a data integration module, a data space-time interpolation module, a data quality evaluation module, an evolution analysis module and a result display module, and all the modules are in electric signal connection. By integrating deep-sea sediment, seabed rock, marine organism fossil and ocean surface environment parameter multi-source data, the data integration and processing capacity is improved, the evolution of the ancient ocean environment is simulated and predicted by utilizing the constructed random forest model, a comprehensive and deep analysis result is provided, and the analysis efficiency is improved. Not only is the evolution rule and trend of the ancient marine environment disclosed, but also a scientific basis can be provided for future environmental protection and resource management.

The invention provides a digital twin model correction method and system based on machine vision. The method comprises the steps that a comprehensive data set is constructed by collecting sounding data, tidal flow velocity data and unmanned aerial vehicle images, wave disturbance deviation and water surface reflection distortion are eliminated based on geometric feature matching, and a dynamic compensation coefficient is generated in combination with tidal parameters; after time deviation of sounding data is corrected, a dynamic incidence relation between terrain elevation and sediment migration rate is calculated, a digital twinborn model fusing sedimentary layer thickness distribution and tidal flow velocity driven erosion boundary prediction is established, and a visual terrain curved surface is generated; through reverse verification of real-time sediment accumulation characteristics and terrain curved surfaces, migration rate weight parameters are adjusted in a self-adaptive mode, and dynamic optimization of the model is achieved. High-precision dynamic coupling simulation of sea area terrain evolution and sediment migration is achieved, the real-time performance and reliability of island surface change prediction are improved, and coastal zone safety and economic collaborative decision making is supported.

The invention relates to a computer-implemented method for identifying at least one area of interest from a region of interest. The method comprises: obtaining a plurality of geo-information data over the region of interest for a geological time interval, the geo-information data comprising at least carbonate reference locations wherein marine carbonate sediments are observed, obtaining at least one paleo-digital elevation model of the region of interest, providing an Earth system model with a plurality of input sets of modeling parameters and obtaining output sets of paleoenvironmental parameters, determining a plurality of representative paleoenvironmental parameters for each carbonate reference location from the plurality of output sets of paleoenvironmental parameters, grouping at least a part of the carbonate reference locations into at least one group of carbonate reference locations defined as carbonate factory, and computing a susceptibility of occurrence of the carbonate factory.

The invention relates to the technical field of hydraulic engineering safety monitoring, in particular to a safety monitoring method and system for a flood discharge and sand flushing service gate. The method comprises the steps that a super-strong permanent magnet sensor is installed on an underwater flood discharge and sand flushing service gate, and the magnetic attraction strength of the super-strong permanent magnet sensor is controlled according to real-time water flow; when the real-time water flow is larger than the preset water flow high threshold value, the magnetic attraction strength is enhanced; if the water flow is lower than the preset water flow high threshold value, the magnetic attraction strength is recovered to the standard magnetic attraction value; the ultra-strong permanent magnet sensor monitors vibration state data and dynamic stress data of each structure in the operation process of the underwater flood discharge and sand flushing service gate; obtaining a rigidity evaluation value and a dynamic stress safety evaluation value of the underwater flood discharge and sand flushing service gate; and performing evaluation in combination with the characteristic data in the operation process of the underwater flood discharge and sand flushing service gate to obtain the safety coefficient of the current underwater flood discharge and sand flushing service gate. The stability of the gate is dynamically enhanced, the magnetic attraction strength is matched with water flow impact in real time, and high-flow-speed loads are effectively resisted.

The invention discloses an analysis method for sediment transportation and deposition in a large-spatial-scale watershed, and relates to the technical field of sediment deposition analysis. The method comprises the following specific steps: collecting a plurality of sediment sediment samples at each sampling point in a drainage basin; analyzing the sediment sediment sample through particle size grading to obtain a sample particle analysis result; generating a particle size grading distribution curve according to the sample particle analysis result; and through the particle size grading distribution curve, according to the proportion of each particle size component in the particle size grading distribution curve, in combination with the erosion amount and the sediment transportation ratio, carrying out sediment budget calculation. According to the method, sediment budgetary calculation is carried out on the large-spatial-scale watershed by applying a particle size grading analysis method, the heap, deposition and transportation conditions of erosion sediment of different particle size groups in the watershed are obtained, and the calculation result is accurate.

Disclosed are exemplary embodiments of sediment / erosion / perimeter control devices and methods of making and using the same. In exemplary embodiments, a sediment / erosion / perimeter control device (e.g., a wattle, etc.) comprises a material configured such that the sediment / erosion / perimeter control device is reconfigurable between at least a first configuration and a second configuration. In the first configuration, the sediment / erosion / perimeter control device has a first size, shape, volume, and / or weight. In the second configuration, the sediment / erosion / perimeter control device has a second size, shape, volume, and / or weight substantially larger than the corresponding first size, shape, volume, and / or weight that the sediment / erosion / perimeter control device has in the first configuration.

The invention provides a method for establishing a deep-sea mining plume rheological model considering physical property changes. The method comprises the following steps: establishing a deep-sea mining plume rheological database under different rheological models; analyzing and comparing the rheological parameter difference of the deep-sea mining plume under different rheological models; and constructing a deep-sea mining plume rheological model considering the physical property change, and constructing a relationship between the rheological parameters and the density. According to the technical scheme of the invention, the model uses the artificial sample kaolin plume with relatively stable properties to represent the mine sediment plume, and overcomes the defects of lack of mine sediment rheological test data and great rheological property difference of deep-sea sediments in various regions at present. The model provides an important reference for the change rule of the rheological property of the sediment in the mining area along with the density, and a deep-sea mining sediment plume rheological model under the full-life evolution period can be constructed on the basis of the important reference.

The invention provides a submarine sedimentary environment dynamic change characteristic inversion method based on three-phase potential. The method comprises the steps of in-situ data processing, electrical signal calibration, mathematical model establishment and dynamic change analysis. A seabed electrode array is arranged, signals of natural potential, resistivity, oxidation-reduction potential and the like are collected in real time, and seabed sedimentary environment characteristics such as seabed interface position, suspended particle concentration, sediment density, porosity, water content and the like are deduced by adopting an inversion algorithm. The method is combined with multi-frequency signal analysis, and can monitor seabed sedimentary environment changes in real time, identify sediment movement and the like. Compared with the prior art such as CN118153411B and CN110411923B, more abundant inversion contents are covered, the monitoring precision and efficiency are improved through the complementarity of potential signals, and higher adaptability and reliability are achieved. The method has low equipment and maintenance cost, is suitable for large-range and long-term monitoring, and can provide an innovative solution in the fields of deep sea monitoring, environment evaluation, resource exploration and the like.

The invention discloses a method for simulating sediment erosion around an offshore wind turbine foundation by combining ISPH with a modified k-epsilon turbulence model. The method comprises the following steps: establishing an ISPH discrete algorithm for solving an average mass conservation equation and a momentum conservation equation of a fluid dynamic ensemble; correcting the standard k-epsilon turbulence model, and calculating the turbulence vortex viscosity vt in the Reynolds stress tensor expression; a critical starting theory on a slope is introduced, a traditional two-dimensional sediment starting model is corrected and expanded, and a three-dimensional sediment starting model is established; establishing a local scouring experiment water tank model of the offshore wind turbine single pile foundation; establishing a corresponding ISPH numerical water tank model; the experimental water tank model and the numerical water tank model respectively simulate the characteristics of the scouring process of sediment around the cylinder, and a numerical simulation result and an experimental result are compared, verified and analyzed. By means of the method, the sediment erosion process around the offshore wind turbine single-pile foundation can be well simulated, the calculation time is short, and the requirements of actual engineering can be met.

The invention belongs to the field of data control optimization, and provides a sediment thickness real-time calculation method, system and equipment based on dynamic electric dip angle feedback, which can collect the current value fed back by a sediment thickness probe by setting a plurality of continuous and equal time sampling windows, collect the current value set in each time sampling window, and calculate the sediment thickness according to the current value set. Respectively calculating a current signal inclination angle according to the current value set in each time sampling window; a dynamic time window is used to filter the current signal dip angle of each time sampling window to control the real-time calculation of the sediment thickness. The sediment thickness can be reliably and continuously obtained in real time and probe deflection and environment drifting can be automatically counteracted under the environments of mud, high pressure, deep holes and the like. The device and the method have remarkable progress in the aspects of drifting resistance, noise resistance, continuous measurement and equipment reliability, and can be widely applied to sediment thickness detection of deep piles, large-diameter cast-in-place piles and coastal high-salt projects.

The invention relates to the technical field of sediment section sluicing, in particular to a sediment section sluicing change prediction method under the influence of a water gate. Acquiring a current erosion and deposition topographic sequence corresponding to the target gate at the current moment, and acquiring future rainfall-runoff data, future upstream and downstream water level difference and future tide level change data corresponding to the target gate within a future preset duration; determining future gate scheduling data corresponding to the target gate based on the future rainfall-runoff data, the future upstream and downstream water level difference and the future tide level change data; and inputting the current erosion and deposition topographic sequence, the future rainfall-runoff data, the future upstream and downstream water level difference, the future tide level change data and the future gate scheduling data into a preset erosion and deposition change prediction model, and outputting the silt fracture surface erosion and deposition change corresponding to the target gate in the future preset duration. And timely and reliable technical support is provided for hydraulic scheduling and risk management, and safe and efficient operation of the estuary tide gate is achieved.

The invention provides a deep-sea rare earth deposit mine collecting car and an operation method thereof. According to the method, a double-S-shaped reciprocating collection path is planned through an intelligent controller on the basis of a mining vehicle carrying a multi-stage collection device and aiming at the characteristic that deep sea rare earth is enriched in a sheet and multi-layer mode. According to the difference between the depth and compactness of the sediments, three stages of cutter suction units are adopted for layered collection: the first stage is used for 0-2m surface soft sediments, and the rotating speed of a reamer is 200-400r / min; the second stage is used for 2-4m middle-layer compact sediments, and the rotating speed is 350-600r / min; the third stage is used for 4-10m deep high-strength sediment, and the rotating speed is 500-700r / min. The terrain, posture and pressure are monitored in real time during operation, the posture, speed and obstacle avoidance of the vehicle body are automatically adjusted, and stable collection is achieved. The method has the advantages of accurate layering, comprehensive coverage, small environmental disturbance and high reliability, and is suitable for efficient, safe and environment-friendly collection of deep sea rare earth deposits.

Provided is an environment-friendly mobile collecting box for decoration cutting dust. The mobile collecting box comprises a box body, wherein a water tank is fixedly mounted on one side of the bottomsurface of the inner wall of the box body, the bottom surface and the outer side of the water tank are fixedly connected to the inner wall of the box body separately, the inner side of the water tankis fixedly connected to one side of the box body, and openings are formed in the top surface and the other side of the box body; a first through hole is formed in the bottom of the inner side of theinner wall of the water tank, a switching valve is disposed in the first through hole, and a second through hole is formed in one side of the box body; the interior of the first through hole communicates with the interior of the second through hole, and the second through hole communicates with the interior of the box body; the top surface of the water tank is fixedly connected to one end of a hose, and the other end of the hose is arranged in the box body, and a floating plate is fixedly mounted on the periphery of the other end of the hose. Sediment in the box body can be pushed directly into the garbage bag through cooperative use of a mud box and a garbage bag, and the mud box can be taken and placed freely; after the mud box is taken out, a sealing cap of the garbage bag containing the sediment is removed, and after the garbage bag is replaced by a new garbage bag, the mud box is put back, and the sediment is not in contact with the mud box, and cleaning of the mud box by a user is not needed, so that time and labor are saved.

The invention discloses a comprehensive silt treatment method for a water conservancy project, and belongs to the field of silt treatment. A comprehensive silt treatment method for a water conservancy project comprises the following steps that firstly, treatment equipment is moved to the position of silt to be treated, and the silt is pumped into the treatment equipment through an underflow pump; 2, the treatment equipment can stir the silt, so that floating objects attached to the silt are separated from the silt; thirdly, the separated floating objects can float on the liquid level, and the treatment equipment can fish and collect the floating objects; 4, the size of the discharging position of the floating object is adjusted according to the height of the liquid level, the discharging speed of the sediment is adjusted, and the height of the liquid level is controlled; the problems that floating objects in silt are inconvenient to treat, separation of impurities such as stones is affected, silt recycling is not facilitated, the dehydration efficiency is low, and the conveying cost is high can be solved.

The invention discloses a comprehensive detection processing and analysis method and system for a deep foundation trench of an immersed tunnel, and relates to the technical field of data processing, and the method comprises the steps: firstly carrying out the acoustic calibration of a multi-beam array in a foundation trench region, and compensating a beam incident angle and echo delay, so as to eliminate systematic sounding errors; then macroscopically scanning the foundation trench based on the corrected sounding equipment to generate a high-resolution three-dimensional point cloud, identifying abnormal elevation change in real time and dynamically adjusting the dredging depth; then multi-frequency acoustic detection is carried out on the silt sediment, a float sludge thickness cloud picture is drawn to evaluate a loose structure, and targeted compensation is carried out; finally, the topographic form and the sediment structure change are jointly used for construction early warning, a closed-loop system from precision calibration to anomaly detection to physical property diagnosis and risk early warning is formed, the precision and integrity of foundation trench depth measurement and sludge monitoring are remarkably improved, potential risks can be found and corrected in time in construction, and the construction efficiency is improved. And the construction safety and efficiency of the immersed tunnel deep foundation trench are guaranteed.

The invention relates to an ultrasonic monitoring system and method for real-time monitoring of underwater sediment erosion and deposition, and belongs to the technical field of port and navigation channel engineering, the ultrasonic monitoring system comprises an automatic pulley block, a data acquisition module, a data analysis module and a plurality of ultrasonic transducers, each ultrasonic transducer is provided with a detection end, each ultrasonic transducer is connected with the automatic pulley block through a cable, the outer side of each ultrasonic transducer is sleeved with a steel pipe, the ultrasonic transducers and the steel pipes are arranged in the water body, a plurality of guide strips are fixed to the inner walls of the steel pipes, and a limiting device is installed at one end of each steel pipe; and a guide device is fixed on the side wall of each ultrasonic transducer. The ultrasonic transducer is matched with the automatic pulley block to detect different positions in the same area, so that the turbidity of a water area is prevented from being large, and the accuracy of monitoring data is ensured.

To solve a problem in which, in a situation where there are numerous dredging depressions for collecting sea sand along the coasts of Japan, and, because these depressions are causing deterioration of marine environment, countermeasures such as backfilling are carried out, and it is necessary to take measures to prevent pollution spread when carrying out construction work at sea, to increase prevention of generation and spread of pollutants in order to further promote a project, and to speed up backfilling work, etc., for reducing project costs.SOLUTION: Seabed backfilling in a countermeasure not using a tremie pipe is carried out using a method in which a soil transport barge loaded with sediment submerges, turns over at a specified seabed surface to unload the sediment, and then the empty soil transport barge automatically floats to a water surface. This speeds up the work. In addition, pollution spread prevention measures of the method includes covering a surface of the loaded sediment with a pollution prevention sheet until just before it is unloaded, and then immediately after reversing for unloading sediment, the soil transport barge and the pollution prevention sheet surround the seabed, to perform prevention of generation and spread of pollution caused by unloading sediment, in two stages.SELECTED DRAWING: Figure 10

The invention discloses a slurry shield cutterhead nozzle arrangement method and system, and relates to the technical field of tunnel engineering and shield tunneling machines. The method comprises the steps that the total flow of nozzles and the number of the nozzles are determined, and the sediment critical starting flow speed is calculated; obtaining a flow velocity-target distance formula according to a water jet theoretical formula, boundary value conditions and a momentum flux conservation theorem; according to the total flow of the nozzles, the number of the nozzles, the sediment critical starting flow speed and the flow speed-target distance formula, the nozzle arrangement target distance is obtained; and arranging the nozzles according to the nozzle arrangement target distance. According to the method, the arrangement target distance of the nozzles of the slurry shield cutter head is integrally and effectively designed in combination with the water jet theory and the sediment starting mechanism.

The invention discloses a dredged sediment geopolymer mix proportion optimization method, device and equipment and a medium. The method comprises the following steps: acquiring dredging sediment geopolymer mix proportion key parameters and corresponding compressive strength data, and constructing a to-be-processed sample set; constructing and training a compressive strength prediction model based on the to-be-processed sample set, and determining a nonlinear mapping relation function of the dredged sediment geopolymer mix proportion key parameters and compressive strength data; constructing a target fitness function according to the nonlinear mapping relation function, the dredged sediment geopolymer production material cost and the production carbon emission; constructing constraint conditions according to the matching ratio key parameter range of the dredged sediment geopolymer, the use amount range of production materials and the volume of the dredged sediment geopolymer per cubic meter; and based on the target fitness function and the constraint condition, carrying out dredging sediment geopolymer mix proportion key parameter multi-target optimization through a genetic algorithm, and determining a dredging sediment geopolymer target mix proportion. And multi-objective optimization of the mixture ratio of the dredged sediment geopolymer is realized.

The invention relates to the technical field of intelligent water affairs, and discloses a dynamic monitoring method and system for the thickness of urban drainage pipeline sediment based on temperature monitoring, and the method comprises the steps: building a simulation device of an urban drainage pipeline sediment distribution scene; acquiring actual temperature time sequence data of sewage and sediments in the urban drainage pipeline; establishing a one-dimensional heat transfer model according to the actual temperature time sequence data, and calibrating model parameters in the one-dimensional heat transfer model; performing numerical simulation in the one-dimensional heat transfer model to obtain a simulation temperature time sequence of the sewage and the sediment; a local maximum / minimum value method and a dynamic tuning and harmonic regression method are adopted to analyze the periodic characteristics of the simulated temperature time sequence, and temperature time sequence characteristics are obtained; and developing a data-driven model, and associating the sediment thickness with the temperature time sequence characteristics. Through temperature monitoring and model analysis, the accuracy and efficiency of sediment monitoring are improved.

The invention relates to the technical field of underwater construction engineering, and discloses an underwater foundation horizontal bearing capacity evaluation method which comprises the following steps: acquiring the geometric dimension and material physical and mechanical properties of a foundation, geological information of a seabed soil sample, ocean current observation data and design wave elements; the maximum scouring depth around the foundation is determined according to ocean current observation data, wave elements and sediment mechanical properties; establishing a foundation-soil body three-dimensional bearing model, and substituting the foundation and soil body mechanical properties and the scouring size to obtain the foundation bearing capacity under each foundation diameter, burial depth, scouring depth and sediment property; according to the relationship between the foundation diameter, the burial depth, the scouring depth and the sediment property and the foundation bearing capacity, a correlation model is established, and the residual value of the foundation bearing capacity after scouring is calculated according to the correlation model. Based on the pile foundation bearing characteristic and the pile-soil interaction mechanical theory, the analysis method has the advantages of being clear in theory, wide in application range, high in reliability and the like. Analysis results are accurate and reliable, influence factors are comprehensively considered, and the method is more scientific.

The sediment sampling device comprises a material containing and supporting mechanism, the material containing and supporting mechanism comprises a bearing bottom plate, a lifting sampling mechanism is installed at the top of the material containing and supporting mechanism, and an inner groove supporting table is fixedly connected to the left side of the top of the bearing bottom plate; the front portion and the rear portion of an inner cavity of the inner groove supporting table are each fixedly connected with a side edge guide block. According to the sediment sampling device and the sampling method, the material containing supporting mechanism and the lifting sampling mechanism are used in a combined manner, and through the arrangement of the two mechanisms, the sampling box can be located at different positions and heights by utilizing the bearing cross frame and the lifting frame, so that sludge at different positions can be sampled; in addition, in the sampling process, the sampling box can be fixed through pushing of the transverse pull rod, meanwhile, the semicircular shovel frame is turned over to dig and store the materials, and the material containing box can be unlocked in the subsequent discharging process.

A suspended load sediment sampling device comprises a remote control boat, a vertical rotating shaft is rotatably arranged at the tail of the remote control boat, a flow guide plate is fixedly connected through the rotating shaft, a sampling barrel is slidably arranged on the flow guide plate in the length direction, an opening is formed in the side, close to the flow guide plate, of the sampling barrel, and a steel wire filter screen is fixedly arranged on the side, close to the flow guide plate, of the sampling barrel. According to the suspended sediment sampling device disclosed by the utility model, the position is changed through the movement of the remote control boat, and the automatic angle adjustment of the flow guide plate is matched, so that the plurality of sampling barrels on the flow guide plate obtain representative suspended sediment samples at different depth positions; and the accuracy and the efficiency of the sampling process are improved.

The invention relates to the technical field of reservoir safety monitoring and early warning, in particular to a reservoir operation state prediction analysis method based on environmental data. The method comprises the following steps: collecting original resistance response sequences of reservoir bottom mud at different depths by adopting low-frequency alternating-current signals through a laid vertical resistivity probe array; performing polarization effect compensation processing on the original resistance response sequence to obtain a sediment resistivity layer spectrogram; collecting reservoir environment data; performing time sequence coupling analysis on the reservoir environment data and the sediment resistivity layer spectrogram to obtain a sediment stability influence factor spectrum; constructing a bottom mud layered structure model according to the bottom mud resistivity layer spectrogram and the bottom mud stability influence factor spectrum; and carrying out basic stress field calculation on the bottom mud layered structure model to obtain an initial stress distribution diagram. Through a full-chain technical route from sediment internal monitoring to multi-factor comprehensive analysis, the early warning timeliness, accuracy and reliability of reservoir sediment disasters are remarkably improved.

The invention belongs to the technical field of geotechnical engineering sludge solidification, and particularly relates to an integrated test system and method for solidifying and repairing polluted bottom mud through vacuum electroosmosis. According to the method, the change of the water content and the electric conductivity of the polluted bottom mud in the electroosmosis treatment process can be monitored in real time, and the change of the pollution concentration of the polluted bottom mud can be calculated in real time according to the change of the water content and the electric conductivity, so that the problems that a traditional test method needs sampling detection, steps are tedious and a result cannot be obtained in real time are solved; no special equipment is needed for measuring the concentration and the moisture content of the pollutants, so that the cost is saved; pollutants in the polluted bottom mud are discharged into the water collecting assembly along with sewage, so that the decontamination effect is ensured; the polluted bottom mud in the mud inlet assembly is sucked into the vacuum container through the negative pressure assembly, so that the uniformity of the polluted bottom mud is ensured; along with the proceeding of the test, the vacuum container compresses the polluted bottom mud, so that the vacuum electroosmosis dehydration and decontamination process is accelerated.

The present application relates to a sediment screening device for water conservancy projects, belonging to the technical field of sediment screening, and comprising: a screening box; a first screen, located inside the screening box and hinged with a first connecting column, the first connecting column being connected to the side wall of the screening box; a second screen, located inside the screening box and below the first screen, the second screen being hinged with a second connecting column, the second connecting column being connected to the side wall of the screening box, and the screening accuracy of the second screen being higher than that of the first screen; a first vibration assembly, arranged on the first screen; a second vibration assembly, arranged on the second screen and having the same structure as the first vibration assembly; wherein, the first vibration assembly is used to vibrate and screen the sediment on the first screen in a manner of large amplitude and low vibration frequency, and the second vibration assembly is used to vibrate and screen the sediment on the second screen in a manner of low amplitude and high vibration frequency. The present application has the effect of improving the screening effect of sediments with different particle sizes.

The present invention relates to a calculation method for the general scour pattern of a cross-sea bridge considering the turbulence effect. The research area including the cross-sea bridge project is determined and meshed, the elevations of each grid node are obtained, typical computational hydrological boundary conditions are selected, a non-hydrostatic three-dimensional mathematical model including the entire cross-sea bridge project is established, the hydrodynamic fields before and after the bridge construction are calculated, the tidal level and flow velocity are verified, the pulsating velocity at each grid node, the sediment settlement velocity in still water and the settlement velocity under the influence of turbulent kinetic energy are calculated, the sediment carrying capacity is calculated according to the estuarine fine sediment model, and finally the general scour amplitude of the seabed at each grid node position is calculated, thereby obtaining the characteristics of the general scour amplitude in the upstream and downstream areas of the bridge. Combining the plane three-dimensional numerical model and the sediment carrying capacity calculation method considering the turbulence effect, through the dynamic equilibrium theory, the accurate prediction of the general scour pattern of the cross-sea bridge including the depth and range is realized, and the calculation accuracy of the general scour pattern of the cross-sea bridge is improved.

The invention relates to the technical field of soil sampling, in particular to a sediment sampler for ocean survey. The bottom end of the sampling tube is a sampling opening, and grips are arranged on two sides of the top end of the sampling tube; a plugging mechanism is rotationally arranged at the bottom end of the sampling tube, and an impacted part is arranged at the top end; the plugging mechanism is used for plugging the sampling opening in a rotating manner; the hit part comprises a top plate fixed at the top end of the sampling pipe and a sliding rod located above the top plate, and a transmission part is arranged between the sliding rod and the plugging mechanism. According to the sediment sampler for ocean survey, the downward moving depth of the sampling pipe is sensed through the clutch control assembly, so that after the sampling pipe moves downwards to the designated depth, the clutch control assembly changes the non-sliding connection state between the hit plate and the top plate into the sliding connection state through the counter-acting force of the ground; the force of knocking the hit plate by the worker next time is transmitted to the blocking mechanism, so that the sampling opening is blocked by the blocking mechanism by virtue of the knocking force.