94 results about "High tide" patented technology

To easily construct a water level prediction model by using a water level prediction model at a water level prediction point in a non-tidal area even in a tidal area similarly to the non-tidal area.SOLUTION: The present disclosure pays attention to that for a water level in a tidal area, an effect of a low tide and a high tide in a river-mouth region is nearly independent from an effect of a water level and precipitation in an upstream area. Then, tidal level data T is subtracted from tidal area water level data E, and the tidal area water level data E is converted into water level data obtained by removing an effect of a tide from the data E. Further, assumed water level data, upstream area water level data U and precipitation amount data R are used to construct a water level prediction model M obtained by removing the effect of the tide similar to a non-tidal area.SELECTED DRAWING: Figure 2

The invention discloses a self-powered seawater uranium extraction system and an application method, the self-powered seawater uranium extraction system comprises a centrifugal solid-liquid separation unit, a membrane solid-liquid separation unit, a flushing unit, a control unit and a video monitoring unit, and further comprises a collection pool and an energy storage pool which are arranged on a beach or partially located in the beach and are arranged in positions to ensure that the collection pool and the energy storage pool can be wholly covered by seawater during flood tide; the hydroelectric generation unit is communicated with a liquid outlet I in the energy storage pool through a pipeline I; the seawater uranium extraction unit is matched with a liquid outlet II in the membrane solid-liquid separation unit through a pipeline II; wherein a liquid outlet III of the collecting tank is communicated with a liquid inlet of the centrifugal solid-liquid separation unit, and a liquid outlet IV of the seawater uranium extraction unit is communicated with the hydroelectric generation unit. According to the self-powered seawater uranium extraction system and the application method, seawater collection and energy storage are conducted through rising tide, electricity is generated through potential energy of seawater in ebb tide, electric energy is provided for the seawater uranium extraction system, and the industrialization process of seawater uranium extraction is promoted by saving energy and reducing cost.

The invention discloses a soil moisture content inversion and determination method based on a remote sensing image, particularly relates to the technical field of surveying and mapping and remote sensing measurement, and is used for solving the problems of space-time inconsistency, system deviation and result non-traceability caused by superposition of a mulching film and a salt shell in spring and tide in an existing saline-alkali area. Under a meter-scale unified grid and a unified radiation and time caliber, three types of interferences of coating, salt crust and phase are extracted as conditional quantities, equivalent bare land processing is completed according to the sequence of phase normalization, coating correction and salt crust correction, then the volumetric moisture content is calculated in a monotonicity controlled model, the stable monotonicity relation between pixel observation and the moisture content is recovered, and the monotonicity controlled model is obtained. The system error caused by the difference between the non-bare ground and the imaging time phase is resolved from the source. Through pre-seasonal and in-seasonal verification, the overall deviation is remarkably reduced, the water content error is kept at a low level, judgment jitter caused by post-rain transient and a high tide window is effectively inhibited by a stabilization strategy, and the engineering precision and consistency requirements of coastal zone spring film covering and salt returning periods can be met.

The invention belongs to the field of ocean remote sensing information, and particularly relates to a laver culture area rapid extraction method based on sentinel No.1 radar images. Comprising the following steps: 1) acquiring a sentry No.1 radar image, and analyzing and processing pixels in the image to obtain a nori raft frame initial product; 2) pretreating the initial product of the laver raft frame to obtain a continuous raft frame product; 3) extracting three masks by using the auxiliary optical image and confused pixels around the high-reflection area; and 4) performing mask processing on the continuous raft frame product by using an extracted result to obtain a spatial distribution grid data set of the laver culture raft frame. According to the invention, the optical image is prevented from being limited by a cloud layer and a turbid water body, the time sequence is integrated through a maximum value synthesis algorithm, and the complete spatial distribution of the raft frame submerged by the high tide level is captured.

The invention discloses a cofferdam pond gate control system based on the Internet of Things, and belongs to the technical field of gate control, and the cofferdam pond gate control system specifically comprises the steps that a data acquisition module obtains satellite tide data and meteorological monitoring data through an Internet of Things control center; the tide level prediction module inputs the two types of data into a multi-model fusion mechanism, integrates an astronomical tide model based on gravity calculation and a meteorological tide model based on wind pressure coupling, and generates a comprehensive tide level curve according to dynamic weight fusion; the height analysis module determines the upper limit of the opening height in the flood period by taking the real-time tide level as the reference flushing retarding interval according to the comprehensive tide level curve, and dynamically adjusts the theoretical opening height of the water changing port in combination with the water head rate in the ebb period; the gate control module generates a gate lifting instruction and issues the gate lifting instruction to the driving unit through the Internet of Things to control the sectional type sealing plate to act, and it is ensured that the error between the actual opening height and the theoretical value is within the preset range; according to the invention, environment dynamic response of tide regulation and control is realized.

The invention discloses an evaluation system and method for marine pollution degree analysis based on buoys, and relates to the technical field of marine pollution analysis. Comprising a buoy deployment module, a judgment and acquisition module, an early warning report module, a pollution analysis module, a pollution evaluation module and an analysis and treatment module, the system aims at the scene in the gulf, due to the fact that the conditions of rising tide and falling tide exist in the gulf, the system can evaluate and analyze the seawater pollution degree in the target gulf within the period of rising tide and falling tide once, and the corresponding number of buoys need to be arranged according to the actual area of the target gulf; the technical key points are as follows: the system can realize real-time monitoring, intelligent early warning, accurate evaluation and dynamic treatment of water quality of a target bay; and the pertinence and the efficiency of the treatment work are improved through the measures of preferentially dispatching the personnel to the marked position, dynamically adjusting and treating the dispatching estimated value and the like.

The application discloses a kind of short-term prediction methods of high tide flood in coastal areas based on probability statistics. Including: obtaining the historical hourly water level observation data of target coastal area tide station and preprocessing;Climate state probability distribution model is constructed, and corresponding climate state distribution parameters are obtained;Decay persistence prediction model is constructed, and the observation abnormal value of future month is calculated according to the current month observation abnormal value;The climate state distribution parameters are adjusted by the observation abnormal value of future month;The daily cumulative flood probability is calculated based on the adjusted climate state distribution parameters;Daily cumulative flood probability is calculated day by day, and the high tide flood probability sequence of coastal cities in future several months is obtained, the warning probability threshold is set, and the date higher than the warning probability threshold in high tide flood probability sequence is marked as high tide flood high risk day.The high tide flood prediction of the application is more in line with the needs of disaster risk assessment, has more information, and can provide seasonal scale prediction, leaving time for medium and long term planning and emergency preparation.

This invention relates to a method for constructing a biodegradable mangrove ecological island based on dynamic tidal energy regulation, and an artificial island siltation device. The artificial island siltation device includes a bamboo gate system, a hemp rope net system, a fixed pile system, and a limiting system. A dynamic filtration structure is formed by the liftable bamboo gate and the hemp rope net. Utilizing the buoyancy difference and water flow velocity changes generated by tidal rise and fall, a synergistic effect is achieved: accelerating the passage of sediment-laden water during high tide and promoting siltation during low tide. A fully biodegradable material is used to construct a growing silt body. The buoyancy balance is regulated by the bamboo joint holes, ensuring the device remains suspended on the surface layer of the silt body. This allows for continuous siltation and elevation of the tidal flat, forming an artificial island that provides a site for mangrove seedling planting and meets the required daily sunrise duration for mangrove growth. The method and device of this invention have technical advantages such as low construction cost, dynamic adaptation to tidal changes, and avoidance of secondary pollution.

A method for joining and launching a long and large-diameter pipeline, the joining and launching method comprising: step 1, sequentially arranging, in a spaced apart manner and from back to front on a pipeline joining platform, an assembly and welding station, an anti-corrosion station and a launching station; step 2, using a crawler crane to hoist and place a plurality of pipe joints on the assembly and welding station of the pipeline joining platform; step 3, pulling a pipeline segment (10) forwards to the anti-corrosion station by means of steel wire ropes (30) on a plurality of winches (3); step 4, respectively passing the ends of the steel wire ropes on the plurality of winches downwards in sequence around corresponding rear fixed pulleys (31) and front fixed pulleys (32), and then pulling the pipeline segment forwards to the launching station by means of the steel wire ropes on the plurality of winches; and step 5, upon high tide, pulling the pipeline segment forwards to a gentle slope by means of the steel wire ropes on the plurality of winches, and then slowly paying out the steel wire ropes on the plurality of winches so as to allow the pipeline segment to freely roll to the water along a launching slideway by means of the center of gravity. The method for joining and launching a long and large-diameter pipeline not only facilitates the joining and launching of pipelines, but can also protect the quality of pipeline finished products.

This invention provides an intelligent control method and device for automatically extracting seawater, belonging to the field of automated control technology for mariculture. The method acquires current time, geographical location, and tidal time data; uses a water level sensor to detect whether the current water level has reached a preset threshold; and uses a water quality sensor to detect the water's conductivity to determine if it is seawater. When the water level meets the standard, the water is confirmed to be seawater, and the current time is within the high tide period, the pumping equipment is automatically started. The device includes a water level sensor, a water quality sensor, a communication module, a positioning module, a control module, and a relay control interface. This invention, through a multi-condition verification mechanism, avoids misjudgment due to rainfall and water accumulation and malfunctions caused by tidal fluctuations, achieving fully automated intelligent control of seawater extraction operations. It solves the problems of high labor intensity, high risk of nighttime operations, and frequent malfunctions associated with traditional manual operations, thus improving the production efficiency and safety of mariculture.

The invention provides an intelligent marine salt marsh monitor control method and a salt marsh monitor, and relates to the technical field of salt marsh monitoring, and the intelligent marine salt marsh monitor control method comprises the steps of simulating and calculating a tide level curve of a research area, obtaining first environment information at a high tide time period and a low tide time period of the tide level curve based on a preset frequency, and / or monitoring the current water level height in real time, second environment information is obtained on the basis of the preset frequency when the current water level height is located between the preset low vegetation elevation and the preset high vegetation elevation, and / or the current salinity value is monitored in real time, third environment information is obtained on the basis of the preset frequency when the current salinity value is located in the preset salinity value interval, and the first environment information and the second environment information are obtained in the high-tide period and the low-tide period respectively. According to the invention, environmental information acquisition is carried out on a salt marsh ecological system, a submerging and exposing process of the salt marsh ecological system, suitable salinity of salt marsh vegetation and time periods of an upper limit and a lower limit, the acquired data is screened, the data storage and wireless transmission quantity is greatly reduced, and the long-term automatic monitoring operation of the instrument is feasible.

A tidal information display device for a movable body includes a position measurement module configured to detect a position of the movable body, a geographical information selection module configured to determine geographic information to be displayed on a display screen based on the detected position, a tidal information module configured to receive and store tidal information based on the detected position, and a tidal information display module configured to generate display data for displaying a graphical user interface (GUI) at a predetermined position on the display screen. The GUI is configured for showing the tidal information including at least one of: a present height of a tide, a high tide time, a low tide time, and a position of the tide.

The invention relates to a warning tide level verification method, which comprises the following steps of: determining a reasonable frequency range of occurrence of a blue warning tide level and a red warning tide level of a verified shore section according to an actual defense work requirement, a defense standard and a historical tide disaster condition; checking whether the blue warning tide level value is higher than the theoretical highest tide level value, if so, judging that the blue warning tide level is reasonable, and otherwise, judging that the blue warning tide level is unreasonable; whether the occurrence frequency of the high tide level exceeding the blue warning tide level and the red warning tide level in the typhoon period is within the reasonable frequency range or not is judged, if yes, the corresponding warning tide level is judged to be reasonable, and if not, the corresponding warning tide level is judged to be unreasonable; and according to the tidal disaster condition during the typhoon period, analyzing whether the disaster level under each early warning level is consistent with the actual tidal disaster, if so, determining that the early warning level is reasonable, otherwise, determining that the early warning level is unreasonable.

This application relates to the technical field of water conservancy facilities and discloses a tidal-powered automatic marine debris collector, which includes a collection bin with an inlet and a drain outlet on the side, the drain outlet being lower than the inlet height; a tidal gate installed at the inlet of the collection bin; a gate movably mounted on the collection bin for opening and closing the drain outlet; and a float connected to the gate, configured to move the gate according to the rise and fall of the external water level. During high tide, the rising external water level opens the tidal gate, exposing the inlet, while the float rises, causing the gate to close the drain outlet. During low tide, the tidal gate closes, while the float descends, causing the gate to open and expose the drain outlet. This application can reduce energy consumption.

The application discloses a soil moisture content inversion and determination method based on remote sensing images, and particularly relates to the technical field of surveying and remote sensing measurement, and is used for solving the problems of time and space inconsistency and system deviation caused by spring film and salt shell superposition and tide and the problem of untraceable results of the prior art. Through unified grid and unified radiation and time caliber, three types of interference of film, salt shell and phase are first refined as conditional quantities, equivalent bare land is completed in the order of "phase normalization, film correction, salt shell correction", and then the volume moisture content is calculated in a monotonicity controlled model, so that the stable monotonic relationship between pixel observation and moisture content is restored, and the system error caused by non-bare land and imaging phase difference is resolved from the source. After pre-season and mid-season verification, the overall deviation is significantly reduced, the moisture content error is kept at a low level, the determination jitter caused by rain after transient state and high tide window is effectively inhibited by the stabilization strategy, and the engineering precision and consistency requirements of coastal spring film and salt return period can be met.

This invention provides a water-filled cable trench and its laying structure, comprising: a main shell disposed in a mudflat section, the main shell having a receiving cavity; a wiring hole disposed on the main shell, the wiring hole communicating with the receiving cavity, through which the submarine cable passes through the main shell; and a water inlet disposed on the main shell, communicating with the receiving cavity, and the water inlet being located above the wiring hole. This design uses the main shell to form a receiving cavity for the submarine cable to pass through. During high tide, seawater submerges the main shell, and seawater enters the receiving cavity through the water inlet. The submarine cable passing through the receiving cavity is in direct contact with the seawater, which absorbs the heat emitted by the cable, thus aiding in heat dissipation. During low tide, the seawater leaves the mudflat section, but a certain amount of seawater remains in the receiving cavity. Therefore, the submarine cable remains surrounded by seawater and can still maintain effective heat dissipation through the seawater.

The invention provides a lagoon face coast dune planting ecological construction method which comprises the steps that a sand blocking area, a dune development area and a plant protection area are sequentially arranged between a sea area and a lagoon face, the lagoon face is communicated with the sea area through a tidal channel, and the water level of the lagoon face is flush with the average sea level; the sand blocking area is located on the near sea area side, the initial line of the sand blocking area is formed by superposing wave climb on the local multi-year average large tide line, and Z1 = MHWS + R. According to the method, the coast sandstorm landform forming power and evolution mechanism is fully followed, the lagoon face sandy coast ecological characteristics and functional potentials are comprehensively considered, and the lagoon face sandy coast ecological characteristics and the lagoon face sandy coast ecological characteristics and the lagoon face sandy coast ecological characteristics and the lagoon face sandy coast ecological characteristics are comprehensively considered. Through application of environmental low-influence technical measures and reasonable layout of ecological space, natural development of coast dunes and rapid field planting and stable development of vegetation suitable for growth are promoted, the ecological space beneficial to plant growth, coast sandy soil stabilization and biological diversity conservation is built, and healthy development of a complete ecological system of the coastal zone is promoted.

The invention relates to the technical field of corrosion tests and equipment, in particular to a tidal range natural acceleration device and a test method.Seawater liquid level changes are monitored in real time through a liquid level sensor, the natural rising tide frequency a and falling tide frequency b of the previous day are obtained, a sample frame is controlled to execute up-down reciprocating motion at N times of frequency, and N is the acceleration rate; and after a plurality of test periods, respectively measuring the corrosion rates of the accelerated test and the naturally exposed sample, calculating the acceleration ratio, and constructing a gray prediction model based on the relationship between the acceleration ratio and time for extrapolating and predicting the natural corrosion behavior of the material in a longer period. According to the invention, a mechanical lifting system capable of being accurately controlled is constructed in a natural seawater tidal range region, so that the frequency of a material drying and wetting alternation process is enhanced, and the corrosion process is obviously accelerated on the premise of not changing the authenticity of a marine environment; the double problems that a traditional indoor acceleration test is poor in correlation with the actual service environment and the natural exposure test period is too long are solved.

An aquaculture system 1 comprises: a waterproof sheet H that forms an aquaculture farm A; an upper fish net NU that is provided on the upper side of the waterproof sheet H; first floats F1 that are provided to the upper end of the waterproof sheet H so as to be positioned at the sea surface during low tide; second floats F2 that are provided to the upper fish net NU so as to be positioned at the sea surface during high tide; ropes for connecting the first floats F1 and anchors provided on the seabed; and control devices 10. The control devices 10 control the lengths of the ropes L between connections to the anchors K and connections to the first floats F1 so as to allow seawater to flow into the aquaculture farm A from portions between the first floats F1 and the second floats F2 during high tide.

The utility model discloses a foaming fender which comprises an anti-soaking assembly and a fender structure, an energy-saving lighting structure and a water level monitoring assembly are fixed on the fender structure, the water level monitoring assembly is located on the rear side of the energy-saving lighting structure, the fender structure comprises a coast, and a position adjusting assembly is detachably installed on the coast. A foaming fender assembly is fixed to the position adjusting assembly, the position adjusting assembly comprises a first fixing plate, a storage box is fixed to the upper side of the first fixing plate, the storage box telescopically adjusts the position of a shock absorber through a telescopic structure, a sliding block is fixed to the lower side of the shock absorber, the sliding block is slidably connected with a sliding groove, and the sliding groove is formed in the first fixing plate. The foaming fender is provided with the position adjusting assembly, the position of the foaming fender assembly is adjusted through the hydraulic cylinder in the storage box, and therefore the foaming fender assembly can be maintained in the later period conveniently, operation is easy and convenient, and unnecessary losses caused by the fact that the foaming fender is submerged by river water or seawater and a ship directly collides with a river bank during flood tide are avoided.

This invention discloses a method for estimating long-duration design tidal process lines, comprising: preprocessing and frequency analysis of historical tidal data to obtain the design high tide level, design flood tide range, and design ebb tide range; selecting a typical long-duration tidal process containing the highest tide level, and selecting a "one flood, one ebb" process at a later position as the main tidal type according to the principle of "high tide level - long duration - later high tide level", with the rest being secondary tidal types; using the design high tide level, design flood tide range, and design ebb tide range to perform same-frequency combination design on the main tidal type to obtain the design main tidal type process; using the scaling ratio of the corresponding phase points of the design main tidal type and the measured main tidal type as a benchmark, scaling the secondary tidal types accordingly to obtain the design secondary tidal type processes; and splicing the results to obtain the complete long-duration design tidal process. This invention overcomes the limitation of existing methods that can only deduce "one flood, one ebb" processes and is applicable to the calculation of any long-duration design tidal process.

The embodiments of the present invention provide a coastal wetland classification method, device, equipment, and storage medium, relating to the field of remote sensing image recognition technology. The coastal wetland classification method includes the following steps: S1. Obtaining a Landsat image set. S2. Combining high tide images, low tide images, summer images, and winter images based on the image set. S3. Obtaining a coarse classification range of mangroves based on the low tide images. S4. Obtaining a coarse classification range of salt marshes and a coarse classification range of tidal flats based on public data. S5. Extracting a valid remote sensing index set from the four images based on the coarse classification range of mangroves, the coarse classification range of salt marshes, and the coarse classification range of tidal flats. S6. Obtaining a set of remote sensing index thresholds for each wetland type in different images based on the valid remote sensing index set. S7. Obtaining a fine classification range of mangroves, a fine classification range of salt marshes, and a fine classification range of tidal flats based on the set of remote sensing index thresholds for each wetland type in different images, the high tide images, the low tide images, the summer images, and the winter images.

The present invention discloses an ecological restoration method for a dammed fish pond in a habitat for offshore seabirds, wherein the dammed fish pond includes a first saltwater fish pond and a second saltwater fish pond that are adjacent to the sea, and the method includes the following steps: excavating a water trough at the bottom of the first saltwater fish pond; setting a plurality of saltwater ecological beaches with slopes in the first saltwater fish pond; clearing the vegetation on the adjacent pond ridges between the first saltwater fish pond and the second saltwater fish pond; and setting an ecological forest for waterbirds to inhabit in the second saltwater fish pond. The technical solution of the present invention increases the volume of the saltwater fish pond by creating a water trough, so that the water level of the saltwater fish pond forms a large drop at high tide and low tide, which is conducive to improving the exchange rate between the saltwater fish pond and seawater, thereby increasing the aquatic biodiversity of the saltwater fish pond, enriching the types of food for waterbirds, and forming a good hydrological environment.

The present invention relates to a tide signal light and a method for driving the same. The tide signal light according to an embodiment of the present invention may include a signal light that is installed on the seashore to prevent accidents caused by tides, and a control unit that controls the operating state of the signal light to indicate the change from high tide to low tide and from low tide to high tide based on data that indicates the tides.

This invention relates to a system for generating clean electrical energy by maximizing the utilization of seawater flow during tidal movements. The system comprises a C-shaped coastal marine dam open towards the shoreline, consisting of four walls (1, 2, 3, and 4). A fixed base (5) is installed between the two walls (2 and 3) farthest from the shore and includes two lateral sides, forming a narrow water passage (gate) (6) between them. The dam encloses a large area adjacent to the shore, preventing seawater from entering during high tide except through the narrow passage, thereby creating a highly concentrated water flow that can be harnessed for electricity generation. The system also includes two movable bases (13) mounted on the lateral sides of the fixed base, capable of moving vertically in response to the changing water levels during tides In order to move the giant turbine(14) in a vertical motion.. Each movable base(13) is connected to air tanks (13-2) positioned beneath the fixed base. A large circular turbine (14) is mounted on a shaft (15) supported by the two movable bases. Two large pulleys (17) are attached to both ends of the turbine shaft, transmitting rotational motion to gearboxes (19), which in turn drive electrical generators (21). During tidal movement, seawater flows exclusively through the gate (6), striking the turbine blades and causing the turbine (14) to rotate with high torque. This rotational energy is transmitted via the pulleys and gearboxes to the generators, which produce electrical energy. The vertical movement of the turbine (14) ensures that it is not fully submerged, so that seawater impacts only the blade edges rather than the central area, thereby maximizing the efficiency of energy extraction from the flow. Additionally, this invention combines high efficiency in clean energy production with reduced operational costs and offers a unique touristic and educational attraction. The coastal location and vertically adjustable turbine allow for the construction of viewing platforms or visitor walkways, making the site a distinctive destination for tourism and learning.

The invention relates to a red warning tide level verification method, which comprises the following steps of: analyzing the highest tide level, the maximum water increase, the submerging condition, the overtopping condition and the social economic loss of each tide disaster process according to tide disaster data, classifying the tide disaster data, and determining the minimum value of the high tide level and the minimum value of the maximum water increase during the submerging or overtopping period; the minimum value of the high tide level in the submerging or overtopping period or the minimum value obtained by superposing the maximum water increasing value on the blue warning tide level value serves as a red warning tide level candidate value of the check bank section; and verifying the red warning tide level candidate value by using the daily high tide level data of the representative station, the highest tide level during the typhoon and the historical tide disaster data, and finally determining the red warning tide level value of the shore section.

The utility model relates to port operation equipment technical field discloses a kind of port machinery transport ship loading and unloading stabilizing device, including stabilizing column, column guide pipe and fixed base, the column guide pipe is fixedly covered outside stabilizing column, vertical support is formed, the side of the column guide pipe is provided with vertical direction rack, driving gear is arranged on the fixed base, the vertical support passes through fixed base, the driving gear is engaged with rack, the driving gear is driven by the driving force provided by hydraulic motor on fixed base, the fixed base is installed to the side of ship deck, the stabilizing column is lowered to seabed, and is resisted to seabed, and the side of ship deck is supported by the engagement of driving gear and rack, and the stability of deck is maintained.The utility model further discloses the loading and unloading system of application stabilizing device.The utility model realizes the requirement and dependence of reducing to ship cabin water quantity adjustment, also greatly reduces the time of pumping water, and the loading and unloading of equipment are quickly completed in high tide level.

The utility model discloses a tide tank which comprises a main tank, a filter tank, an air chamber, an overflow sewer pipe, a water pump, an upper water pipe, an air suction pipe, an exhaust pipe, a second electric ball valve and a Venturi jet device. The water feeding pipe comprises a first water feeding main pipe, a first water feeding branch pipe, a second water feeding branch pipe, a first electric ball valve and a second water feeding main pipe. The water inlet end of the first water feeding main pipe is communicated with the water outlet end of the water pump, the water outlet end of the first water feeding main pipe is communicated with the first water feeding branch pipe and the second water feeding branch pipe, the Venturi jet device is arranged on the first water feeding branch pipe, and the first electric ball valve is arranged on the second water feeding branch pipe. In the utility model, when the tide continues to rise, the high tide level, the ebb tide and the low tide level, most of water flowing out of the first water supply main pipe flows through the second water supply branch pipe, and only a small amount of water flows through the first water supply branch pipe, namely, only a small amount of water is subjected to resistance of the Venturi jet device; therefore, the flow loss of the water pump can be obviously reduced.

The invention relates to the technical field of wharf roll-on and roll-off facilities, in particular to a slope-adjustable lifting platform and system. The lifting platform comprises a lifting supporting module, a passing platform module and a butt joint springboard; the lifting supporting module comprises a lifting supporting single piece arranged in the width direction of the passing platform module, the lifting supporting single piece comprises a supporting body, a movable block and a driving assembly, and the movable block is movably connected with the supporting body; the driving assembly drives the movable block to move up and down along the supporting body. The passing platform module comprises two platform sections hinged to each other, the platform sections are supported through the lifting supporting module, and butt joint springboards are arranged on the two platform sections. The lifting body penetrates through the platform section, and the movable block is hinged to the bottom of the platform section. The lifting height and gradient of each platform section can be freely adjusted so as to be in butt joint with two banks with different heights, and the requirement for landing of landing ships with different ship board heights in the high tide or the low tide or butt joint of an offshore platform and the coast can be met.

The invention discloses an intelligent salty-avoiding dredging system and method for an estuary reservoir. The intelligent salty-avoiding dredging system comprises a reservoir defined by an external dam and an internal dam, a reservoir gate, a silt flushing gate, a front flushing nozzle array, a flow guide groove, a plurality of rotatable sills and a monitoring control unit. The external dam is provided with an overflow weir matched with the average high tide level, and the monitoring control unit comprises a sonar detector, a water level sensor, a conductivity sensor, a tide level meter and a control module. Water is stored during flood tide, and saline water is intercepted through the sill; when the tide level is low, the bottom sill is controlled to rotate to achieve seawater directional silt flushing, and silt is discharged to the deep sea through the flow guide groove and the desilting gallery; when the water level of the reservoir drops to a threshold value, slightly opening a reservoir gate to form a salt-pressing flow field, and adjusting the opening degree of the gate through water conductivity to replace salt water; and after replacement is completed, the sluice gate is closed firstly, then the reservoir gate is closed, and salt tide blocking is achieved. Tidal energy is used for saving water and energy, the silt washing efficiency is improved through directional diversion of the sill, intelligent regulation and control are achieved in the whole process, the salt avoiding effect is good, and water consumption for dredging is low.