725 results about "Shallow sea" patented technology

The invention discloses a three-dimensional structure sound source radiation sound field forecast method under the shallow sea channel and belongs to the sound source radiation sound field forecast field. The method is characterized in that firstly, a structure sound radiation multi-physical field coupling model under the shallow sea channel is established, the sea sound propagation theory is selected according to analysis frequency range, calculation distance and shallow sea environment factors to establish a two-dimensional axisymmetric channel transmission function G, through orientation coupling solution development, a channel three-dimensional sound field transmission function is acquired, secondly, the shallow sea channel multi-boundary sound field coupling calculation theory is employed to establish a multi-physical field coupling model, a structure sound source surface speed U under the shallow sea channel under the action of multi-boundary influence is acquired through calculation, and lastly, the Fourier wave superposition method theory is utilized to forecast the sound field information P of a structure sound source at any field point under the channel is forecasted. Themethod is advantaged in that multiple bottleneck problems of high computational complexity, multiple coupling physical fields and complex channel environments existing during researching three-dimensional elastic structure sound source radiation sound field characteristics under the complex shallow sea channel in the prior art are effectively solved.

The invention discloses an indirect self-adaptive equalization method of a shallow-sea underwater acoustic communication system to eliminate transmission intersymbol interference brought by a shallow-sea underwater acoustic channel with the time-varying and multi-diameter characteristics. The method comprises the following steps: designing a signal frame structure suitable for transmission in the shallow-sea underwater acoustic channel at a sending terminal; utilizing a frame head PN sequence to carry out rapid channel estimation and the initialization of equalizer tap coefficients at a receiving terminal; selecting a corresponding threshold according to the practical transmission environment to realize the decentralization of equalizer taps; and adopting an LMS algorithm with a variable step size to further reduce errors so as to better equalize frame body data. The invention enables an equalizer in the shallow-sea underwater acoustic communication system to have rapid convergence and lower hardware complexity, has good equalization effect on a sending signal after high-level modulation and can be effectively applied to the shallow-sea high-speed digital communication system.

A rated voltage of 35kv or below shallow sea wind farm photoelectrical transmission composite cable comprises a cable core provided with a lead and a water-blocking filling piece, a water-blocking belting layer, a plastic-aluminum composite band layer, an internal sheath, a wire armoring layer and an external sheath, wherein the cable core are externally coated with the water-blocking belting layer, the plastic-aluminum composite band layer, the internal sheath, the wire armoring layer and the external sheath in turn, the cable core is internally provided with a fiber optic communication unit, a steel-tape armoring layer is arranged between the external sheath and the wire armoring layer. The structure of the fiber optic communication unit is as follows: a fiber loose tube is externally coated with an internal sheathing layer, an armoring layer and an external sheathing layer in turn. A conductor of the lead adopts two-tier structure: a central layer conductor is formed by twisting multiple stranded brass wires coated with water-blocking balm, and then coats a central layer semiconductive water-blocking band layer; an external layer conductor is coated outside the central layer semiconductive water-blocking band layer by multiple stranded brass wires coated with water-blocking balm, and then coats an external layer semiconductive water-blocking band layer. The invention has the complex function of optical communication and power transmission, one cable has two uses, thereby saving cost and facilitating laying; in addition, the cable has high strength, excellent wear resistance, corrosion resistance and waterproof function, and can adapt to the requirement for subsea use in long term.

The invention provides a method for measuring submarine density and sound velocity based on multi-path reflection theory; based on plane wave reflection theory and snell law, the method comprises: extablishing equations with submarine reflection coefficients of multiple paths, measuring the time of arrival, the nearby reflection angle and energy at seabed of each path by equipment such as a vertical array and a sound source so as to finally obtain submarine density and sound velocity; the measured submarine density and sound velocity can be used to solve the positioning problem of passive objects in an unknown condition of submarine environment in shallow sea. The beneficial effects of the invention are that: the method uses obliquely incident sound wave of a sound source; the reflection wave energy is large; the emitting sound source is not limited by high power or narrow directivity; the method can measure submarine density and sound velocity independently; although earth sound parameters of each layer of a multilayer submarine medium can not be measured, equivalent density and sound velocity under a submarine semi-infinite space model can be measured; and the method has the advantages of a simple and practical experiment platform, low price, low computational complexity and the like.

The invention relates to an aerial magnetic force detection device and an aerial magnetic force detection method based on an unmanned aerial vehicle. The aerial magnetic force detection device comprises an aerial magnetometer system, an unmanned aerial vehicle flying platform, an onboard data collection system and an onboard GPS (global positioning system). The aerial magnetometer system comprises a total-field magnetometer and a three-component magnetometer, wherein the total-field magnetometer is used for measuring earth magnetic fields and the three-component magnetometer is used for measuring attitudes of the unmanned aerial vehicle. The onboard data collection system comprises a master control module, a total-field magnetometer collection module, a three-component magnetometer collection module, a GPS module, an A / D (analog to digital) collection card, a state display module and a storage module. The aerial magnetic force detection device and the aerial magnetic force detection method have the advantages that large manned aerial vehicles are not needed, aeromagnetic survey cost is reduced, the device and the method are applicable to magnetic force detection of the borderland, where vehicles and ships cannot reach, between land and shallow sea, and low cost, high safety and the like are achieved.

The invention discloses a device for ecologically culturing seashell and alga in shallow sea and a method thereof. The device comprises a seashell culture raft and an alga culture raft. The seashell culture raft comprises at least two paralleled floating ropes; buoys are arranged on the floating ropes and are connected with the floating ropes through floating ties; the two ends of each floating rope are fixed by underwater fixing mechanisms; the alga culture raft made by at least one culture curtain is arranged above each two adjacent floating ropes; the adjacent culture curtains are fixed by floating bamboo perpendicular to the floating ropes; and the two ends of the floating bamboo are connected with the floating ties. The device can be used to carry out the hanging culture of the seashell on the floating ropes and carry out the culture of the alga in the culture curtains floating above the floating ropes, thereby realizing the composite culture of the seashell and the alga. The device and the method have the advantages of reducing the culture cost, improving the culture efficiency and culture space utilization factor, and having good effects on the comprehensive use of shallow sea waters, the improvement of the water environment and the prevention and control of diseases.

This invention disclosed a monitor device used in ocean perambulation and a method. It can be used in measuring acoustics parameters of sediment precisely. It can collect data without altering the sediment and the environment. It has advantages compared with traditional methods. It can be applied to research sound velocity of sediment, sound attenuation, dispersion and reflection character of seabed interface, acoustics geotechnics character of sediment, natural gas hydrate and aeration zone in shallow sea, etc.

An under water self-holding sectional buoy with combined energy source is composed of external bag, internal bag, electromagnetic valve, hydraulic plunger pump, proton exchange membrane fuel cell (PEMFC), DC servo motor, casing, and a sealed cvity consisting of sealing bottom plate, working chamber of heat machine, cooling chamber of heat machine, cooling chamber of PEMFC, and bossing. The combined thermal and electric supply system of PEMFC is used for the temp difference drive in deep sea and electric drive in shallow sea.

The invention discloses a large-scale ecological purse seine breeding device in shallow sea. The large-scale ecological purse seine breeding device in the shallow sea comprises a buoyancy system, a netting system, a dragon-shaped sandbag and an anchoring system, wherein the buoyancy system comprises double-row main floating pipes which are arranged in a parallel mode at intervals and a shore connecting structure which is fixedly arranged on the shore; two ends of the main floating pipes are respectively connected to the shore connecting structure and can longitudinally move up and down relative to the shore connecting structure; the netting system comprises a purse seine and the upper end of the purse seine is fixedly connected with the main floating pipes; the dragon-shaped sandbag is arranged at the bottom of the netting system; the anchoring system comprises a main anchor rope, the upper end of the main anchor rope is connected to the main floating pipes, and the lower end of the main anchor rope is fixedly arranged at the bottom of the sea through a piled anchor or an anchor block. The large-scale ecological purse seine breeding device in the shallow sea has the advantages of meeting the strength requirement of the buoyancy system of the purse seine by utilizing a mode of fixing the purse seine under the HDPE (high-density polyethylene) main floating pipes; ensuring a purse seine system to be always connected closely with a coastal connecting section and avoiding escape of the fish due to the fact that a buoy which is arranged in the shore connecting structure changes along with water levels; and being capable of avoiding the purse seine winding under different tide levels by arranging a chain and a floating ball string in the purse seine.

A conversion device for nature energy at sea is disclosed. The device effectively accesses low energy wave and wind and converts the energy into operable energy for application. The device is applicable to the change of tide and the size of wind power and is suitable for use at the shallow sea side.

The invention discloses a shallow sea oyster single body cultivation method. The method comprises the following steps of sperm and egg obtaining, fertilization, incubation, baby oyster cultivation, young oyster collection, middle cultivation of young oyster seeds in a sea area, separation of the young oysters from matrixes, and placing of oyster single bodies in baskets and cultivation. According to current oyster single body cultivation, the young oyster single bodies cultivated in a room are adopted and directly placed in the sea area for cultivation, as the young oysters and cultivation cage screens are small, a cultivation cage is blocked by float sludge in the sea area easily, the young oysters are mutually piled up easily and grow slowly, and the survival rate is low. The method solves the problems that the existing oyster single body cultivation effect is poor, the oysters grow slowly, and the survival rate is low. The method is easy and convenient to carry out, and high in operability and survival rate, and the oyster single bodies grow fast.

The invention provides a method for using a shallow-sea low-frequency coherent vector sound field interference structure for detecting and identifying a target. The first step is that the Fourier transformation of the sound pressure and the vibration velocity signal is respectively carried out; the second step is that the Fourier transformation of the vector signal is conjugated; the third step is that the Fourier transformation of the sound pressure signal is multiplied by and the female court attendant of the Fourier transformation of the vector signal; the fourth step is that the real part or the imaginary part is obtained; the fifth step is that the judgment of the positive or negative sign is carried out; and the sixth step is that the depth classification of the target is given according to the judgment of the positive or the negative sign of the fifth step. The method develops the work against the passive detection of the remote target and the target depth judgment, in particular to the application purpose of the target depth judgment. The method has important application prospect in comprehensive marine monitoring, seashore early-warning system, small platform sonar, aviation acoustic buoy and other aspects.

The invention provides a novel shallow sea sand wave area multi-beam sounding terrain reconstruction method based on remote sensing image features. Terrain reconstruction is conducted to multi-beam sounding data which are obtained in an interval type measuring line mode by that feature information (sand wave ripples and wave crests) and a sand wave terrain distribution law are utilized, wherein the feature information (sand wave ripples and wave crests) and the sand wave terrain distribution law of the shallow sea sand wave terrain are presented in a remote sensing image. Therefore, integrated sand wave terrain information is obtained. The shallow sea sand wave area multi-beam sounding terrain reconstruction method based on the remote sensing image features aims at terrain mapping requirements of wide distributed shallow sea sand wave terrain areas. Sand wave textures and sand wave crest lines in the remote sensing image are served as reference control information to lead into the multi-beam sounding data terrain reconstruction. High-accuracy shallow sea sand wave area terrain can be reconstructed through the multi-beam sounding data, wherein the multi-beam sounding data are obtained in an interval type measuring line mode. The shallow sea sand wave area multi-beam sounding terrain reconstruction method based on the remote sensing image features is an innovation of a cross application aspect of remote sensing information technology and multi-beam sounding technology. The shallow sea sand wave area multi-beam sounding terrain reconstruction method based on the remote sensing image features has great practical values.

The invention belongs to the marine observation field and particularly discloses a shallow sea submerged buoy and a utilization method thereof. The shallow sea submerged buoy comprises a submerged buoy main body, a mooring recycling device and a releasing fishing device; the submerged buoy main body is formed by an observation base, an observation device (a thermosalinograph and an acoustic Doppler current profile meter) and a backup battery cabin; the observation base comprises a trawl resistant outer casing, a hanging socket, a supporting frame, balancing weight, an acoustic Doppler current profile meter level fixing clamp and a sacrificial anode; the mooring recycling device comprises a gravity anchor, a tail mooring rope and a connecting chain; the arranging fishing device comprises a research vessel, a shipboard winch, a shipboard hoist, a steel rope, a release hook and a recycling jagged hook. In the shallow sea with the depth of water less than 100 m, the shallow sea submerged buoy has the advantages of efficiently achieving measure of elements such as sectional flow rate, water temperature of places near to the sea bottom and salinity, being high in cost performance, having a trawl, being good in data quality, long in operating time, stable in releasing and recycling, simple to operate and the like.

The invention relates to the technical field of the breeding of shellfish seedlings, in particular to an artificial breeding method for Mactra chinensis. Through the combination of artificial ripening and ecological ripening of parents, the development of sex glands is regularly detected to determine the mature period of the sex glands of the parents; methods such as shade drying, water flowing and so on, are adopted to stimulate the spawning and spermiation of the parents to obtain fertilized eggs, and D larvae are obtained through the embryonic development; and on this basis, larva breeding, larva metamorphosis and juvenile shellfish cultivation are performed. A large amount of Mactra chinensis seedlings can be obtained through the links. The method breaks through an artificial breeding technology of the Mactra chinensis, solves the problem of the breeding of the Mactra chinensis seedlings that fails to be broken through for a long time, and lays a solid foundation for the development of cultivation and proliferation of native species, the resource recovery of shallow seas and tidal-flat areas, and the maintenance of biological diversity. The method has the characteristics of simple and convenient operation and high practicality.

The invention relates to a foundation of a wind generating set, in particular to a foundation of a high-power wind generating set more suitable for regions with poor geological conditions such as beaches or shallow seas and more capable of preventing the wind generating set from toppling. The foundation is structurally characterized in that: at least three cantilever beams bearing main toppling flexural moment of the wind generating set are distributed in radial shape around a bearing platform bearing main vertical load of the wind generating set; cantilever beam pillow blocks are positioned below the cantilever beams and arranged between the outer ends of the cantilever beams and the bearing platform; the upper end of an anchor rod or an anchor rope is connected with the outer end of the cantilever beam, and the lower end of the anchor rod or the anchor rope is connected on an anchor body embedded into the ground or thrown into the water; and the foundation supported below the bearing platform and the cantilever beam blocks is an integral connected foundation or a split foundation corresponding to the positions of the bearing platform and the cantilever beam blocks. The parts, except the bearing platform, of the foundation can be produced in a factory, so the field construction is convenient, and the building cost is lowered.

The invention relates to a culture raft frame for scallop and mussel culture, which is suitable for artificial culture of marine products including shallow sea scallops and mussels. The culture raft frame comprises a large culture stalk, inflation and exhaust type buoys, a culture cage, pulleys, an inflation and exhaust hose and an air valve core sealing valve, wherein the large culture stalk is connected with the buoys by regulating cables, one buoy is corresponding to a regulating cable, a universal lock catch is arranged below each buoy, a water depth graduation mark is arranged on each regulating cable, the inflation and exhaust type buoys are uniformly arranged on the large culture stalk and connected with the large culture stalk by cables and cable padlocks, water charging and drainage holes are uniformly arranged below the inflation and exhaust type buoys along the circumferential direction, and double pulleys are respectively arranged at both ends of the large culture stalk. The raft frame can realize upward floating and sinking of the large culture stalk within a depth range of 2-12m under the sea level, thereby satisfying various requirements of the cultured marine products on water depth and water temperature in different sea conditions and different seasons.

The invention discloses a shallow sea water depth inversion method based on high-spectrum data of a blue-yellow wave band. Currently, models which perform depth inversion on clean water body through an optical remote sensing facility are mostly established for aiming at multiple-spectrum data. The algorithm is restricted by wide spectrum data wave band and little spectrum information. The inversion precision is largely affected by type of water body sediment. The invention provides a novel method for inversing shallow sea water depth of the clean water body through utilizing the high-spectrum data of the blue-yellow wave band (450-610 nanometers) according to a water body optical attenuation mechanism based on the high-spectrum data. The method can accurately extract shallow sea water depth distribution information within 30 meters. Furthermore one algorithm coefficient calibration is required for one remote sensor, thereby remarkably improving universality of the algorithm.

Disclosed is a construction method for carrying out sea reclamation with sand in a shallow sea area through a cutter suction dredger. The cutter suction dredger comprises a cutter suction head, a suction pipe, a power system and a ship body. The cutter suction dredger adopts a mechanical reamer of the cutter suction head to ream the underwater sand soil layer through the power system, and then mechanically excavates and sucks soil through a mud pump of the power system. The sucked sand soil is conveyed to the destination through a pipeline conveying mode, and the construction method for carrying out sea reclamation with sand in a shallow sea area is realized through water separation and sand sedimentation. The construction method includes the steps that A, machines are arranged in place; B, a sand blasting guide pipe is laid; C, soil is sucked in a cutting mode and excavated; D, soil sediments to make land. The sand sedimentting on the seafloor serves as the filling materials of a sea reclamation structure. Cutting of coastal line resources is effectively reduced. The original ecologic environment of the sea is protected to the maximum extent. The work procedures of slurry excavation, conveying, discharging, processing and the like are finished at a time, so that the construction efficiency is improved.

The invention discloses a bottom-supported floating pile-driving platform, which includes a caisson, a support device, an operating platform, a pile gripper and a crane. Inside the caisson are arranged a ballast tank and a water feeding / discharging system for controlling water feeding / discharging of the ballast tank; the support device is installed on the caisson, and supports the operating platform; the pile gripper is installed on the operating platform and used for positioning a pile body; the crane is used for hoisting the pile body and a pile hammer; the ballast water amount of the ballast tank in a sailing state is smaller than the ballast water amount of the ballast tank in a pile driving state; and the caisson floats on water in the sailing state, but comes into contact with the underwater ground in the pile driving state. With the caisson, the inventive bottom-supported floating pile-driving platform can adapt to pile foundation construction in shallow water areas such as intertidal zone and shallow sea area. As the caisson is always stably supported on the underwater ground in the process of pile driving, the pile foundation construction safety is not affected even in case of tide ebbing and stranding.

The invention provides an oscillatory type tidal power generation device which comprises a base, a column, tidal energy-absorbing boards, a power generation oil cylinder, a hydraulic power accumulator, a generator and a power generation hydraulic motor, wherein the column is arranged on the base and at least one swing arm is arranged on the column; the power generation oil cylinder is connected between the swing arm and the column; the tidal energy-absorbing boards are respectively arranged at the two ends of the swing arm; the power generation oil cylinder is connected with the hydraulic power accumulator which is arranged on the column through an oil pipe; the hydraulic power accumulator is connected with the power generation hydraulic motor through an oil pipe; the power generation hydraulic motor, the hydraulic power accumulator and the generator are all arranged on the column; and the power generation hydraulic motor is connected with the generator. According to the invention, a tide-driven hydraulic device is used to drive mechanical energy into electric energy; high-pressure hydraulic oil produced by the oscillation of the tidal energy-absorbing boards can drive the generator to generate electricity by the rotating of the power generation hydraulic motor. The device has simple structure, high reliability, low failure rate and is easy to install and maintain. Not only is the device suitable for high current sea areas, but also suitable for slow flow areas with lower flow rate and shallow sea areas.

The invention provides a shallow sea target depth classification method based on a hydrophone array. Detection is performed by integrating information received by multiple hydrophones, a typical probability density function of energy field change produced by model-based deep and shallow sound sources is generated by acoustic propagation simulation, likelihood ratio test (LRT) is performed based on the probability density function to identify a received signal, prior knowledge is extracted according to the law of distribution of sound energy within the whole range of a sound field, and thus, depth classification is performed on the sound field target. The algorithm is easy to implement and high in environmental adaptability.

The invention discloses a method for reclaiming land around sea, which aims to build a firm dam around the sea capable of resisting the impact of windstorm and tide in a coastal shallow sea area with water depth of 3-5 meters and encircles to form the land in the dam around the dam. The method comprises the following steps: placing sink boxes special for reclaiming land around sea in the shallow area at the sea bottom in the shallow area and connecting to form a dike around the sea; then floating the sink boxes on the sea and tracking the sink boxes to the preset position of the dike; filling silt into the sink boxes to sink and connect the sink boxes; adding pile fixed sink boxes inserted into the sea bottom into the sink boxes; and blowing and filling the land higher than the sea level inside the dam around the sea so as to improve the capability of the dike for resisting the impact of tidewater and the stability of the dike, wherein the sink boxes are rectangular reinforced concrete box bodies and produced by large batch flowline production on the land. The method is applicable for reclaiming land around sea on the shallow area and has high construction efficiency, low cost, good economic benefit and safe construction.

A shallow sea water depth multi-source remote sensing fusion inversion method comprises the steps of: 1, preprocessing a multispectral remote sensing image to obtain a sea surface reflectivity; 2, acquiring and processing a field test depth value; 3, conducting single-source water depth inversion and water depth segment identification; 4, conducting multi-source water depth inversion fusion; and 5, conducting water depth inversion accuracy verification; using the n types of single-source water depth results, corresponding water depth segment identification images and fusion parameters as input, and conducting multi-source water depth inversion fusion by pixel; verifying water depth inversion accuracy, and using a final depth value as the output data of the actual water depth value of the remote sensing image. Compared with the inversion method of the prior art, the method can comprehensively utilize different responses of a plurality of remote sensing data sources to water depth information, excavate the water depth data, improve inversion accuracy, and conduct decision-making fusion process, and is especially applicable to marine water depth measurement of shallow water region in complex situations.

The invention relates to an artificial shallow sea ecosystem marine ranch. The marine ranch is an ecological bionic project artificially imitating a natural upwelling fishery and a shallow continental shelf ecosystem fishery. With an artificially induced upwelling marine ranch device, nutrient-salt-rich deep sea water is induced to lift to a euphotic zone. Nutrient salt sinking is prevented with an artificial hallow continental shelf ecosystem marine ranch device. A huge well-conditioned place is provided for the growth, reproduction, spawning, feeding, hiding, inhabitation and activity of various marine lives. Coordination and cooperation of light, heat, water, fertilizer, bait, oxygen and space resources are realized. Solar energy is absorbed and converted into biomass energy; carbon dioxide is absorbed and reduced into phytoplankton; and through the marine ecosystem food chain and food web, phytoplankton is converted into zooplankton and economic animals such as fish, shrimp, crab, shell, sea cucumber, squid and the like. After catching and processing, seafood such as fish meat, fishmeal and fish oil can be produced. The seafood fish meat can be adopted as a food; the fishmeal can be adopted as a feed; and the fish oil can be processed into food or into biodiesel as an energy. With the marine ranch, in the sea euphotic zone, solar energy is converted into food and energy.

The invention provides a pile-barrel foundation applied in coast, shallow-sea and deep-sea project, characterized in that it comprises a pile and a barrel with cavity at the center of top cover; the pile passes through the cavity to form Jin-shape structure. In construction, at first the barrel is set to presetting level position on submarine foundation; then the pile passes through the cavity at the center of top cover to presetting level position on submarine foundation; finally the pile and the barrel is consolidated at the junction position. The invention can bear heavy uplift, down-stroke, horizontal load. Special simulating test proves that the construction time of pile-barrel foundation is 1 / 4-1 / 2 of conventional pile foundation and the project cost is 60%-80% of pile foundation. It is provided with simple operation. The barrel foundation can be used again. In construction, there is no any pollution and waste object. It has huge social and economical benefit.

The invention belongs to the field of acoustic positioning and particularly relates to a near-field three-dimensional passive positioning method based on a horizontal line array. The near-field three-dimensional passive positioning method based on the horizontal line array comprises the steps that that the horizontal line array is adopted, the array is fixedly distributed on the flat seabed, radiation signals of a target acoustic source in an underwater sound field are received, amplification and filtering are conducted, and data collection is conducted; the orientation of a target is measured roughly; according to scanning points, time-delay compensation and superposition are conducted on incoming wave signals received by each array element in each scanned area, so that obtained focused beams are formed and output; the power of each sound signal which is obtained after superposition is worked out, the power value of each point in the scanned area is output on a sound image; a measured area is scanned precisely; the coordinates of two bright spots in the scanned area are determined; the three-dimensional coordinates of the target acoustic source are solved reversely through post-processing. The near-field three-dimensional passive positioning method based on the horizontal line array is based on the focused beam forming theory and method, no prior knowledge is needed, and high-precision three-dimensional passive positioning of a shallow sea short-range target can be achieved, wherein the positioning error within 400 m is smaller than 0.5 m.

The invention discloses an original-space detector and a detection method for beach shallow sea sediment strength. The original-space detector for the beach shallow sea sediment strength comprises a control ship and a frame device, wherein the control ship is provided with an air charging device and a vacuum generator and the frame device is provided with an injection device and a hydraulic device. An air pressure chamber on the frame device is connected with the air charging device and the vacuum generator. The air pressure chamber is a cylindrical leather bag with cross section being circular and vertically arranged. A protection cylinder is further arranged outside the leather bag. Water discharge holes are formed in the surface of the protection cylinder. The water discharge holes are in an oval shape, a V shape or a U shape. The method comprises the steps that the frame device is pulled to a target point through a ship and sinks to the seabed through self weight, strength of sediment under the seabed is detected through a hydraulic injection manner, contacting probe strength testing parameters are obtained, test points stratums are divided according to strength values of various layers of soil, names are chosen for the stratums, and bearing force and modulus on beach shallow sea foundation sole are confirmed. According to the original-space detector and the detection method for the beach shallow sea sediment strength, the defect that a large-scale research vessel can not be driven to a beach shallow sea range to conduct original-space strength detection for the seabed sediment is overcome, geological exploration can be repeatedly conducted in different seabed areas, cost is greatly reduced, and efficiency is improved.

The invention relates to a normal wave modal frequency dispersion elimination transformation-based sound source distance and depth estimation method. According to the method, based on a phenomenon that shallow sea received signals are subject to frequencydispersion elimination transformation and then realize sound pressure focusing on a distance-frequency dispersion parameter two-dimensional plane, only when the transmission distance parameter of the received signals is equal to the distance of a target sound source, the sound pressure amplitude of normal waves can be maximum, and therefore, the distance parameters of the target sound source can be estimated; after the received signals have been subjected to the frequency dispersion elimination transformation, modes of first few orders can be separated obviously in the time domain, and the energy of the modes of the first few orders can be accurately estimated; and a multi-modal energy matching mode is adopted, so that the depth of the target sound source can be determined.

The invention relates to a shallow sea pipeline seafloor nutrient salt gas injecting and elevating device which is sequentially provided with a sea surface gas injection device, a gas conveying pipeline and a nutrient salt elevating device from top to bottom, wherein the sea surface gas injection device is communicated with one end of the gas conveying pipeline; the other end of the gas conveying pipeline is communicated with the nutrient salt elevating device; the sea surface gas injection device comprises an air pump system and a floating platform; the air pump system comprises an air pump, a flow control valve and a flow meter; the inside of the floating platform is hollow to form a gas storage chamber; the nutrient salt elevating device comprises a seafloor air chamber and a plurality of nutrient salt elevating pipelines; and the seafloor air chamber is communicated with the plurality of nutrient salt elevating pipelines. The shallow sea pipeline seafloor nutrient salt gas injecting and elevating device has high efficiency and low energy consumption, and can play an important role in cultivating and recovering fishing grounds.