52 results about "Upwelling" patented technology

The invention provides a method for cooperatively regulating and controlling chlorophyll-a concentration variability through vortex-upwelling, and relates to the technical field of ocean remote sensing and environmental monitoring. A multi-source satellite and reanalysis data set is obtained, and a stationary time sequence is constructed; identifying a dominant variation period in chlorophyll-a concentration, sea surface temperature and sea surface height anomalies, and extracting a monthly abnormal value sequence; performing complex empirical orthogonal function analysis on the sea surface height anomaly, extracting a dominant spatial variation mode of the sea surface height anomaly, and identifying a vortex distribution position and form; classifying and screening target vortexes according to vortex types and seasons, carrying out normalization processing on the chlorophyll-a concentration, aligning to vortex centers, and analyzing a spatial response relationship between the vortexes and the chlorophyll-a concentration; and drawing a density time-depth profile map and a CHL-SLA composite map by combining surface chlorophyll-a concentration, sea surface height anomaly and vertical Argo buoy data, and analyzing an influence mechanism of vortex-upwelling on chlorophyll-a horizontal distribution.

The invention discloses a method for quantifying upwelling intensity and biogeochemical process thereof based on hydrogen and oxygen isotope, which comprises the following steps: acquiring hydrological information and hydrogen and oxygen isotope value of a target sea area, and establishing a hydrogen and oxygen isotope mass balance model; based on a hydrogen and oxygen isotope mass balance model, calculating the proportion of different source water bodies in the upwelling affected zone of the target sea area, and obtaining the contribution of deep water to the upwelling affected zone; estimating the theoretical nutritive salt concentration of the upwelling affected zone based on the nutritive salt concentrations of the original surface water and the upwelling source deep water and the contribution of the deep water to the upwelling affected zone; and comparing the actually measured upwelling affected zone nutritive salt concentration with the theoretical nutritive salt concentration to obtain the contribution of the biological process of the target sea area. Based on the advantage that hydrogen and oxygen isotopes in water are tracers of water, a method for quantifying the upwelling intensity and the biogeochemical process of the upwelling intensity is developed, and a new technical method is provided for scientifically and quantitatively evaluating an upwelling ecological system.

The invention relates to the technical field of pumped storage, and discloses a reservoir evaporation suppression device for a pumped storage power station, which detects the surface water temperature Ts and the deep water temperature Td in real time, forms a temperature difference delta T, and combines a preset temperature difference threshold value delta T0 as a starting judgment basis, so that the water temperature Ts and the deep water temperature Td are detected in real time, the temperature difference delta T is formed, and the water temperature Ts and the deep water temperature Td are started. It is ensured that the device only has significant temperature difference ([delta] Tgt; [Delta] T0) is started when evaporation is intensified. During starting, water flow introduced into the water inlet pipe can form upward flow, vertically uprush to the surface water body area and penetrate through the thermocline in the process, and during the process, low-temperature water in the deep water body area can be guided into the surface water body area due to the pressure difference effect, so that cross-layer heat exchange is achieved, and the water temperature of the surface water body area is reduced; water molecule kinetic energy is reduced from the physical level, surface water evaporation is remarkably reduced, surface water loss is reduced, the total amount of follow-up water supplementing is reduced, and then the water supplementing cost is reduced.

A deep water drawing step of drawing deep water that exists in a deep region of the sea to a surface region of the sea with an upwelling pipe (1); and a phytoplankton culturing step of culturing the phytoplankton in the upwelling pipe (1) are included to produce, as a basic producer of a food chain, a living marine resource, such as fishes and shellfishes, with phytoplankton produced in the phytoplankton culturing step.

The invention provides a construction method of an enteromorpha green tide biomass estimation and near-shore disaster risk prediction model, and belongs to the technical field of marine environment. Multispectral remote sensing image data of a target sea area is collected, and an upwelling spectrum recognition function and a bubble interference removal function are used for constructing an enteromorpha upwelling spectrum matrix; an enteromorpha bubble spectrum matrix is established based on a gain spectrum difference function and a drift correction function to realize accurate spectrum identification, an enteromorpha gain biomass matrix is established through processing of a spectral feature extraction function and a biomass estimation function, and a near-shore disaster risk prediction model is established based on a risk assessment function. Dynamic adjustment and optimization are carried out through a sea area optimization model, integrated modeling of accurate identification of enteromorpha spectral characteristics, accurate estimation of biomass, movement track prediction and coastal risk assessment is realized, and the technical problems that the estimation precision of enteromorpha green tide biomass is insufficient and spatial-temporal dynamic prediction of coastal disaster risks cannot be realized are solved.

The invention relates to the technical field of data processing, and provides a marine chlorophyll a spatial-temporal variation and trend prediction method and system, and the method comprises the following steps: obtaining wind speed and sea surface temperature data for a to-be-predicted region; for the wind speed data, combining the strength of Ekman transportation and the angle of a coastline to quantify coastwise upwelling, and obtaining an upwelling index calculated based on the wind speed; using a DINEOF method to reconstruct missing data in the sea surface temperature data, and performing interpolation processing on the sea surface temperature data; and predicting the upwelling index and the sea surface temperature data subjected to interpolation processing by adopting a Chl-a long-term trend prediction model which is obtained based on correlation analysis and is related to the sea surface temperature and the wind speed, so as to obtain the concentration and the change trend of the sea chlorophyll a. According to the method, the precision of wind speed data quantification processing is improved, and meanwhile, missing data are processed, so that the accuracy of the concentration and the change trend of marine chlorophyll a can be improved.

The invention provides a method for distinguishing chlorophyll a concentration of an upwelling region influenced by different types of cyclones, and relates to the technical field of ocean remote sensing and environment monitoring. Preliminarily judging the influence of vortex on chlorophyll a concentration distribution; dividing the research area into a near-shore area and a far-shore area according to the water depth, respectively drawing vortex center-chlorophyll a concentration fusion maps for the two areas, and comparing the influence of cyclone and anti-cyclone of the two areas on chlorophyll a concentration distribution; dividing the vortex into a near-shore vortex and a far-shore vortex according to the ratio of the distance from the vortex center to the coastline to the vortex radius, respectively drawing vortex center-chlorophyll a concentration fusion graphs, and comparing the influence of cyclone and anti-cyclone on the chlorophyll a concentration distribution; and matching the temperature and salt data of the Argo buoy with the vortex position, analyzing the correlation between the potential density abnormity and the chlorophyll a concentration, and distinguishing the influence mechanism of vertical nutrition input and horizontal advection on the chlorophyll a concentration.

The application provides a method for vortex-uplift flow coordinated regulation chlorophyll-a concentration variability, relates to the field of ocean remote sensing and environmental monitoring technology, obtains multi-source satellite and reanalysis data set, constructs smooth time series; identifies dominant variability period in chlorophyll-a concentration, sea surface temperature and sea surface height anomaly, extracts monthly anomaly value sequence; applies complex empirical orthogonal function analysis to sea surface height anomaly, extracts its dominant spatial variability mode, identifies vortex distribution position and shape; according to vortex type and season, classifies and filters target vortex, carries out normalization processing to chlorophyll-a concentration and aligns to vortex center, analyzes spatial response relationship between vortex and chlorophyll-a concentration; in combination with surface chlorophyll-a concentration, sea surface height anomaly and vertical Argo buoy data, density time-depth profile graph and CHL-SLA composite graph are drawn, and the influence mechanism of vortex-uplift flow on chlorophyll-a horizontal distribution is analyzed.

A detection apparatus 1 for detecting an upwelling region includes: a simulation unit 11 for simulating sea surface temperature data, chlorophyll-a concentration data, and ocean current velocity data of regions in the ocean; a preprocessing unit 12 for creating a ground truth label of an upwelling region on the basis of a vertical velocity included in the ocean current velocity data; a classification unit 14 for training a learning model for outputting a classification result of an upwelling region in response to the input of sea surface temperature data and chlorophyll-a concentration data, wherein the training is performed by inputting the simulated sea surface temperature data and chlorophyll-a concentration data to the learning model, and further inputting the ground truth label of the upwelling region to the learning model; and a detection unit 17 for acquiring a classification result of an upwelling region in the ocean from the learning model by inputting sea surface temperature data and chlorophyll-a concentration data of the ocean acquired from a satellite to the learning model.

The present invention discloses a device and method for lifting seabed nutrients in a shellfish raft culture area. The shellfish raft includes a raft and a limit cable connected between the seabed and the raft. The device for lifting seabed nutrients in a shellfish raft culture area includes a raft arranged on the seabed, a plurality of groups of jet pipes are fixedly arranged on the raft, and a plurality of jet nozzles are opened on each group of jet pipes. The jet pipes are connected with an air duct, and an upper pressurizing mechanism and a lower pressurizing mechanism are connected to the air duct. The present invention uses the upper pressurizing mechanism and the lower pressurizing mechanism to provide power for the air duct to introduce gas above the sea surface into the seabed, forming an air curtain, so that an upwelling is generated in the raft culture area, thereby lifting the bottom water with a high nutrient salt content to the surface layer, providing bait microalgae for growth, improving the abundance of bait microalgae in the culture area, improving the primary productivity of the raft area, and thus improving the survival rate and yield of raft cultured shellfish. At the same time, it can increase the dissolved oxygen in the surface water, thereby playing a role in optimizing the seawater environment in the culture area.

The utility model discloses a sand coring engineering driller which comprises a coring driller which comprises a mast assembly and a mast base. The stabilizing assembly comprises a first fixing plate, a first hydraulic push rod, a second fixing plate, a second hydraulic push rod, a movable plate, a fourth through hole, a supporting column, a supporting disc and a spring, the first fixing plate is fixed to the side edge of the mast base, the first hydraulic push rod is fixed to the first fixing plate, and the second fixing plate is fixed to the movable end of the first hydraulic push rod. The second hydraulic push rod is fixed to the second fixed plate. The movable plate is fixed to the movable end of the second hydraulic push rod. The utility model solves the problems that the working place of the sand field coring drilling machine is on the beach sand field, the beach sea surface has the characteristics of soft stratum, high water content and the like, and silt at the bottom of a drill hole upwells along with water along with the deepening of the drilling depth, so that the contact part of the mast base and the sand field is loosened, and the mast is unstable.

A large nuclear-powered ship, such as a repurposed aircraft carrier or a large cargo ship, is outfitted with a plurality of large downward-directed subsurface mixer propellers secured on its sides and / or ends. The propellers are positioned below the bottom of the ship and have blade lengths in the range of 10-60 m. They are coupled to the ship's steam turbines by drive shafts and gearing compatible with the required propeller power and rotational rates, typically 25-150 MW per mixer propeller and with blade tip speeds typically around 40 m / s. They produce a large-diameter low-velocity downward plume of surface sea waters below the ship that induces upwelling of cold nutrient-rich deep waters in areas where the cyclone genesis index is high. The downward mass-flow magnitude (typically 3-30 times the flow rate over Niagara Falls, but at only a few m / s) is on the scale needed for a small number of such ships to essentially end cyclone genesis in the Atlantic. At the same time, the induced upwelling of nutrient-rich deep waters is expected to lead to the newly mixed areas becoming highly productive fishing areas.

The present application relates to the technical field of marine environment monitoring, in particular to a kind of network layout design method for exchange area sea environment observation of submarine and buoy, comprising: the core channel coordinate set of Indonesian through flow is extracted by multi-scale process identification algorithm, the spatiotemporal distribution matrix of Java upwelling intensity and monsoon influence weight coefficient;Based on observation platform adaptation model, typical marine process characteristic parameters are matched with sensitive sea area operation constraint condition, and platform type combination scheme is generated;Fixed-mobile platform joint data transmission link is constructed, and the topology graph of collaborative observation strategy is output;Using nested observation optimization algorithm, according to the characteristics of core channel area, upwelling area and monsoon influence area, high, medium and low sampling frequency are configured, and multi-resolution nested layout scheme is generated.The present application can realize the unity of spatial partition refinement, platform configuration collaboration and data acquisition high adaptability, and significantly improve the coverage integrity of Indo-Pacific exchange area sea environment observation network.

Provided is a detection device 1 that detects an upwelling region, wherein the detection device 1 comprises: a data integration unit 14 that integrates sea surface temperature data in a predetermined region, chlorophyll-a data, sea surface altitude data, and sea bottom altitude data; and a classification unit 15 that identifies an upwelling region from the integrated data by using a classification algorithm.

The invention belongs to the technical field of ocean energy utilization, and particularly relates to an ocean energy utilization device which comprises a sealed cabin, a sleeve shell and an oscillating floater. The oscillating floater is driven by sea waves to move up and down, and the sleeve shell rigidly connected with the oscillating floater and the middle column penetrating through the sealed cabin are driven to synchronously reciprocate; the upper section of the middle column directly drives the linear generator to generate power to complete core energy conversion; when the piston head moves upwards, cold seawater is sucked in through a filter plug at the tail end of the water inlet pipe, and at the moment, a one-way valve I is opened; when the piston head is pressed downwards, the first one-way valve is closed, seawater is pressurized, pumped into the flow guide grooves in the two sides of the interior of the sealed cabin and ascends along the grooves to flow through the cabin wall of the linear generator to be actively cooled, and the seawater absorbing heat jacks open the second one-way valve and is discharged from the water outlet pipe. Part of discharged water flow is evenly sprayed on the outer wall of the sealed cabin through a collector ring on the inner side of the supporting bridge, and the cleaning effect of the first scraping ring and the second scraping ring fixed to the sleeve shell in the follow-up scraping process is enhanced.

This invention belongs to the field of coastal ecological restoration and marine aquaculture technology. Specifically, it is an artificial composite reef structure, including a base. The base is a trapezoidal frame structure with multiple frame columns inside. The base columns are fixedly connected to the surface of the base, and the base columns are fixedly connected to the sleeves. The sleeves are slidably connected to the telescopic columns, and the telescopic columns are threadedly connected to the surface of the telescopic columns. The other end of the telescopic columns passes through the sleeves and the base columns, making a slidable connection. By combining the frame-type base with upwelling reefs and bird-standing stakes, a two- or three-layer artificial composite reef structure is formed, creating a multifunctional marine biological reef environment. This overcomes the problems of the single function and limited environment of ordinary biological reefs. It not only has a wider range of applicability, but also organically combines the two- or three-layer structure to create a multifunctional marine habitat, forming a three-in-one marine ecosystem integrating sea, land, and air.

A large nuclear-powered ship, such as a repurposed aircraft carrier or a large cargo ship, is outfitted with a plurality of large downward-directed subsurface mixer propellers secured on its sides and / or ends. The propellers are positioned below the bottom of the ship and have blade lengths in the range of 10-60 m. They are coupled to the ship's steam turbines by drive shafts and gearing compatible with the required propeller power and rotational rates, typically 25-150 MW per mixer propeller and with blade tip speeds typically around 40 m / s. They produce a large-diameter low-velocity downward plume of surface sea waters below the ship that induces upwelling of cold nutrient-rich deep waters in areas where the cyclone genesis index is high. The downward mass-flow magnitude (typically 3-30 times the flow rate over Niagara Falls, but at only a few m / s) is on the scale needed for a small number of such ships to essentially end cyclone genesis in the Atlantic. At the same time, the induced upwelling of nutrient-rich deep waters is expected to lead to the newly mixed areas becoming highly productive fishing areas.

An upweller array configured to be disposed in a body of water and that has one or more upweller systems. The one or more upweller systems include a buoy configured to float on the surface of the body of water, a tether coupled to the buoy and a hydrofoil rotor coupled to the tether. The hydrofoil rotor is configured to be disposed in the body of water based on a length of the tether.

The present invention discloses a deep-sea mining head that uses vortex shedding to create an upwelling field. The head comprises a mining hood, a front deflector, a rear deflector, a curvature plate, a jet device, and a vortex generating mechanism. The mining hood is a shell with an open bottom, and the front and rear deflectors are positioned relative to each other on the front and rear sides of the hood. The curvature plate is mounted on the top wall of the mining hood and cooperates with the front and rear deflectors to form a flushing and mining chamber. A water supply chamber is formed between the front deflector and the mining hood, and the water supply chamber communicates with the flushing and mining chamber. A suction pipe is positioned above and behind the mining hood, and the vortex generating mechanism comprises a plurality of piles arranged in a transversely spaced sequence. The jet device comprises a water supply pipe assembly, an angle adjustment mechanism, and two sets of jet nozzles, one mounted on the front deflector and the other on the rear deflector. The present invention uses jets to flush seabed mineral nodules, exfoliating them and carrying them backward, making them easier to remove and lift, thereby improving mining efficiency and reducing interference with the marine ecosystem.

The utility model discloses an efficient fluidized bed denitrification nitrogen removal tower which comprises a tower body, a water distribution pipe, a water inlet pump, a backflow water pipe and a backflow circulating pump, a fluidization reaction area, a backflow buffer area and a water outlet area are formed in the tower body from bottom to top, and a plurality of lower-layer inclined plates which are arranged in parallel at intervals are fixedly arranged between the backflow buffer area and the fluidization reaction area. A plurality of upper-layer inclined plates which are arranged in parallel at intervals are fixedly arranged between the backflow buffer area and the water outlet area, water passing channels which obliquely extend are formed between the adjacent lower-layer inclined plates and between the adjacent upper-layer inclined plates respectively, a water outlet pipe opening is formed in the side wall of the water outlet area, and a water inlet pump can feed water to be treated into the tower body through a water distribution pipe fixedly arranged at the lower end in the tower body. The side wall of the backflow buffer area is provided with a backflow port, the two ends of the backflow water pipe are communicated with the backflow port and the water distribution pipe, and the backflow circulating pump can pump water and sludge in the backflow buffer area into the water distribution pipe, so that the sludge leakage caused by the ascending velocity is reduced, the sludge amount and the denitrification load in the reactor are ensured, and the device is energy-saving and environment-friendly.

The application discloses a kind of artificial upwelling high-efficiency tidal current velocity range transport calculation method and device, comprising: according to injection depth, injection depth corresponding injection amount, seawater density gradient, the diameter of injection nozzle, the environmental water density at injection nozzle position, the density of injected gas is, bubble slip velocity, plume target height, plume effective range and plume efficiency standard, calculate initial buoyancy flux, buoyancy frequency;Calculate critical horizontal cross-flow velocity;When horizontal cross-flow velocity is less than the critical horizontal cross-flow velocity, calculate the range of artificial upwelling high-efficiency tidal current velocity;When horizontal cross-flow velocity is greater than the critical horizontal cross-flow velocity, calculate the range of artificial upwelling high-efficiency tidal current velocity;Calculate artificial upwelling high-efficiency tidal current velocity range.It can make artificial upwelling system run when artificial upwelling plume can be efficiently transported to target position, realize artificial upwelling system efficiency maximization.

According to the artificial fish reef based on the natural bait, a closed reef is a closed reef body arranged at the water bottom, the closed reef body comprises a closed side wall and a top wall connected with the side wall, an opening is formed in the top wall, a frame reef is installed in the opening in an embedded mode, and the frame reef comprises a hollow side edge extending vertically and a top connected with the side edge; guide rails are arranged on the inner sides of the side edges, a limiting structure is arranged on the top, the upwelling reef generates an upwelling effect to guide the water flow direction, and the upwelling reef is provided with pulleys slidably connected with the guide rails so that the upwelling reef can vertically slide in the frame-shaped reef along the guide rails; the floating platform frame is provided with a buoy to float on the water surface, and the tension adjusting device is arranged on the floating platform frame and connected with the fish reef assembly through a cable; the insect trap is installed on the floating platform frame, the photovoltaic panel is installed on the floating platform frame to convert solar energy into electric energy, and the electrical equipment is installed on the floating platform frame and electrically connected with the photovoltaic panel and the insect trap. The artificial fish reef provides natural bait and is changeable in structure.

To provide the construction and a method of a natural farm that gives no stress to an aquatic organism, causes no risk of disturbing an environment due to escape, is safe, and has low costs by installing an escape and hiding place of a juvenile fish, protecting the juvenile fish, improving a survival rate of the juvenile fish, culturing the juvenile fish by natural predation of an organism, employing water quality with natural purification action, and culturing the juvenile fish in the same ecosystem as that in the ambient, and to create a rich fishing place in a coast by discharging deep ocean water onto a front layer of a sea level having poor nutrition.SOLUTION: Proliferation is achieved by protecting a juvenile fish by providing: a surrounding part provided in a land side water area of an offshore breakwater block, having no bottom surface, having a lower end edge portion always contacting a water bottom, and having an upper end edge portion always being over the water level; and a hiding place for a juvenile fish that has entered the place through a clearance part, that is provided in the surrounding part, and to and from which a juvenile fish can enter and exit and an adult fish cannot enter and exit, and by fertilizing the periphery of the surrounding part by a deep water upwelling device.SELECTED DRAWING: Figure 1

The embodiment of the invention discloses an artificial breeding fish releasing site selection method, device and equipment and a storage medium, and relates to the technical field of water conservancy project ecological protection, and the method comprises the steps: determining the optimal flow velocity interval for the survival and inhabitation of target fishes through sampling the relationship between the distribution number of the target fishes and the flow velocity of the distribution site; obtaining an upstream induction flow velocity of the target fish by using a fish swimming ability test; establishing a hydraulic model based on the operation condition of the release area reservoir area, and calculating the flow velocity spatial distribution of the release area reservoir area under the target condition through the hydraulic model; and determining a target releasing site according to the flow velocity spatial distribution, the optimal flow velocity interval for survival and inhabitation of the target fish and the induction flow velocity for upstream tracking of the target fish. The technical problems that in the prior art, an empirical fish releasing method is adopted, so that the survival rate of fishes is not controlled, and the proliferation effect is poor can be solved.

This invention discloses a method for quantifying upwelling intensity and its biogeochemical processes based on hydrogen and oxygen isotopes. The method includes: acquiring hydrological information and hydrogen and oxygen isotope values ​​of a target sea area, and establishing a hydrogen and oxygen isotope mass balance model; calculating the proportion of different source water bodies in the upwelling influence zone of the target sea area based on the hydrogen and oxygen isotope mass balance model, and obtaining the contribution of deep water to the upwelling influence zone; estimating the theoretical nutrient concentration of the upwelling influence zone based on the nutrient concentrations of the original surface water and the deep water at the upwelling source, as well as the contribution of deep water to the upwelling influence zone; and comparing the measured nutrient concentration of the upwelling influence zone with the theoretical nutrient concentration to obtain the contribution of biological processes in the target sea area. This invention leverages the advantage that water hydrogen and oxygen isotopes are tracers of water itself, developing a method for quantifying upwelling intensity and its biogeochemical processes, providing a new technical approach for the scientific quantitative assessment of upwelling ecosystems.

The BioFan fluid theory, which has been developed as a principle for water cultivation since 2006 and has achieved numerous successes, is the culmination of a theory based on energy conservation. Because it was designed so that a large amount of energy is not consumed in the flow rising from the seabed, there was a problem in that it could not directly draw up large amounts of water from the seabed of deep lakes, bays, or oceans. [Solution] A new theory was constructed to directly draw large amounts of water from depths where photosynthesis is declining. By introducing three design condition equations to fully satisfy this theory, it became possible to regenerate large and deep lakes, bays, and oceans into abundant fishing grounds and suppress the ocean acidification that is currently a problem.

The utility model discloses a seawater filter device of high pressure seawater pump, including filter device main part, flange cover and fastener, the upper surface fixed mounting of filter device main part has flange cover, the upper surface of flange cover and located the edge position inlayed with fastener, the inside inlayed of filter device main part has filter core, the movable cover of filter core's surface is equipped with rotating part, the inside lower fixed mounting of filter device main part has base, the side surface fixed mounting of base has support block. The utility model discloses a seawater filter device of high pressure seawater pump, when seawater enters the inside of filter device main part, and the seawater of fast upwelling can drive no.

The present invention relates to the field of next-generation marine information technology and discloses a method for observing and evaluating the intensity of ocean upwelling, comprising: obtaining ocean profile observation data from multiple stations on a straight observation section in a target area; processing the data to obtain the profile distribution of geopotential temperature and geopotential density at each station; performing a multi-point sliding average on the data at each station in the vertical direction to filter out noise and high-frequency signals; plotting the distribution of salinity, geopotential temperature, and geopotential density at the section with respect to depth; marking contour lines of each parameter; selecting areas with consistent contour line distributions, calculating the angle between the contour lines and the horizontal line; and performing dimensionless processing on the angle to obtain an evaluation index. The present invention can quantitatively evaluate the strength of seawater upwelling during a single observation using field observation data of seawater temperature and salinity sections without a network connection. If multiple observations are repeated, the evaluation index can also provide temporal characteristics of the upwelling intensity, providing guidance for ship navigation decisions.

The present application belongs to the technical field of river and lake ecological dredging equipment, and particularly discloses a spiral propelling underwater ecological dredging robot, which comprises a dredging cover for forming a closed operation interval underwater, and a perforated isolation plate is fixedly connected to the inner side of the dredging cover for separating the dredging cover into a filtering cavity and a dredging cavity distributed in an upper and lower manner; a double-spiral propelling stirring system is installed on the inner side of the dredging cover. The present application integrates an independently controllable internal circulation hydraulic flushing system, combines layered screening and double-mode reclamation, is suitable for different properties of bottom mud, and simultaneously avoids the blockage of bottom mud impurities. The "one body and two uses" mode directly sucks the silt through the lower cabin reclamation when the bottom mud impurities are less; the upper cabin mud discharge mode can be selected when the impurities are more to reduce the blockage; in the process of screening, the hydraulic flushing and the resulting upward flow rate also synchronously realize the screening of the bottom mud particle size, and the silt particle size selection type dredging is accurately realized.

The invention relates to the technical field of ocean new-generation information, and discloses an ocean upwelling intensity observation and evaluation method, which comprises the following steps: acquiring ocean profile observation data of a plurality of stations on a straight line observation section of a target area; processing the data to obtain profile distribution of potential temperature and potential density of each station; multi-point moving average is carried out on data of each station in the vertical direction, and noise and high-frequency signals are filtered out; drawing a distribution diagram of section salinity, potential temperature and potential density along with depth; marking isolines of the parameters; selecting an area with consistent isoline distribution, and calculating an included angle between the isoline and a horizontal line; and carrying out dimensionless processing on the included angle to obtain an evaluation index. According to the invention, under the condition of no network, on-site observation data of seawater temperature and salinity cross section are utilized to quantitatively evaluate the strength of seawater rising motion in one observation; if repeated observation is carried out for multiple times, the evaluation index can also give out the change characteristics of the upwelling intensity along with time, and guidance is provided for ship navigation decision making.