478 results about "Shallow water area" patented technology

The invention discloses an artificial fish reef which comprises an artificial fish reef body, and is characterzied in that the artificial fish reef body is in an inversed Y shape; the inversed Y-shaped artificial fish reef body is composed of an upper part unit, a left lower part unit and a right lower part unit which are cast by reinforced concrete into a whole, wherein the upper part unit is ina vertical downward arrow shape which is formed by an upper left oblique post, an upper middle post and an upper right oblique post; the left lower part unit is in an upward and inclined right oblique arrow shape, and is formed by a left lower left oblique post, a left lower middle post and a left lower right oblique post; and the right lower part unit is in an upward and inclined left oblique arrow shape, and is formed by a right lower left oblique post, a right lower middle post and a right lower right oblique post. According to the invention, the artificial fish reefs are combined and stacked to construct a place for spawning and perching of fishes, and in case that a plurality of artificial fish reefs are combined, the stability and dynamic property of the artificial fish reef can be greatly improved. The artificial fish reef provided by the invention can be used for proliferation of shallow-water-type rocky fishes, shellfishes and algae in a shallow water area of a water depth 6-10 meters.

The invention discloses a water quality automatic monitoring data acquisition device, and relates to the technical field of water quality monitoring. The device comprises a floating platform, whereinthe bottom of the floating platform is provided with buoys, the top of the floating platform is provided with a protective box, the protective box is internally provided with a first motor, a water tank and an air pump, the water tank is located between the first motor and the air pump, one end of the first motor is rotatably connected with a winding wheel through a rotating shaft, the outer wallof the winding wheel is wound with a pulling rope, and one end of the pulling rope is provided with a lifting seat. The device ensures the stability in sampling through introducing negative water pressure into a sampling tube, and avoids a problem of inaccurate data caused by the mixed water quality in subsequent sampling due to the residual water sample in the sampling tube, realizes the functions of water parameter acquisition, analysis, storage, supervision, early warning and display for deep or shallow water areas by adopting an integrated intelligent water quality acquisition control system, and greatly improves the integration and intelligentization degree of the water quality acquisition device and the accuracy of water quality parameter acquisition.

The invention relates to a small electric remote control aquatic weed harvester. Aquatic weeds grow in natural or artificial shallow water areas widely and are harvested substantially manually or by large manned aquatic weed harvesters, and the aquatic weeds in narrow, complex and scattered water areas are difficult to harvest effectively. The invention is mainly characterized in that the small electric remote control aquatic weed harvester is driven by rechargeable batteries, the work of a motor is controlled by a remote control device, a catamaran consisting of two boat-shaped floating drums can be ensured to complete the actions of advancing, retreating, turning left, turning right, starting a cutting knife and stopping in water, and the whole equipment can be assembled and disassembled and cutting depth can be adjusted. The small electric remote control aquatic weed harvester has the advantages of mechanical transmission, small size, flexible operation and light draught, can collect floaters in water, utilize clean energy without pollution and greatly improve the efficiency of harvesting various submerged plants, floating plants and emerged plants, is particularly suitable for harvesting and cleaning the aquatic weeds in the natural or artificial water areas of small and medium sizes, maintains health of aquatic ecosystems and builds a beautiful and clean water body environment.

The invention relates to a method for constructing a wetland type river channel. A natural gentle slope type retaining wall is constructed in a land directional area from the position above a normal water line to the top of a protection slope by using soil engineering materials, tree and shrub vegetation is planted, emergent aquatic plants are respectively planted in a bottomland area and a shallow water area of the river channel, floating-leaved plants and submerged plants are planted adjacent to the emergent aquatic plant area, and the transverse width of the planting area on each side is equal to or smaller than one fourth the width of the water area of the river channel. According to the method for constructing the wetland type river channel, the foundation with the novel soil engineering materials, the biological protection slope provided with the novel soil engineering materials as the foundation and covered by the tree and shrub vegetation, a bottomland wetland with emergent aquatic plant community as the main body and a bank zone with the floating-leaved plant and submerged plant communities as the main body are constructed respectively on the wetland type river channel, and a river channel biological system with the complete structure and function is formed. The method for constructing the wetland type river channel is capable of obviously improving river water quality, good river channel landscape can be created, and the living quality of city residents can be improved.

The invention discloses a novel crawler-type amphibious mowing salvage ship which comprises a hull, a crawler drive mechanism, a propeller drive mechanism, a collection and storage mechanism and a control room, wherein the crawler drive mechanism, the propeller drive mechanism and the collection and storage mechanism are arranged on the hull, the control room is arranged at the stern, and the hull is of a dual-floating-body connecting bridge structure formed by two floating bodies and a deck in a lap joint mode. The novel crawler-type amphibious mowing salvage ship is provided with a dual-power system, can achieve two drive modes of propeller propelling and crawler walking, can collect floating refuse and cut and collect float grass, water hyacinths and other aquatic plants in deepwater riverways, and can also carry out operation in shallow water areas and wetlands.

The invention discloses an amphibious type multi-functional floater salvaging device. In the salvaging device, a supporting body is a double-floating body(1) driven to sail by an underwater propeller(13), the front end of the double-floating body(1) is provided with an intercepting-salvaging device(3), and both sides of the double-floating body(1) are provided with a water-and-land travelling device(2); and the water-and-land travelling device(2) mainly comprises a driving device(11), a track(12), a driving wheel(26), a supporting wheel(27) and a tension wheel(28), wherein the track(12) is tensioned by the driving wheel(26), the supporting wheel(27) and the tension wheel(28), and the outer surface of the track(12) is provided with blades(25). The amphibious type multi-functional floater salvaging device can not only sail in water, but also run overland; particularly, the amphibious type multi-functional floater salvaging device can use the special strength in the shoal water zones of a water body to conveniently salvage aquatic plants, floating refuse and cyanobacteria in the shoal water zones; and the problem of salvaging dead angles which cannot be solved by common automobiles and ships is solved.

The invention relates to an offshore single-pile base structure and an installation method thereof. The structure comprises a tubular pile, a flange component and an annular platform, wherein the flange component comprises a flange disc and a flange hub, the flange hub is arranged on the inner wall of the flange disc, the flange hub is welded on the upper end of the tubular pile, and the upper part of the flange hub which is exposed out of the tubular pile and the flange disc is used as a striking lug boss; and an annular component is arranged on the wall of the tubular pile, and the annular platform is connected with the annular component through a bolt. The installation method comprises the following steps: barge positioning, pile feeding, pile sinking, hoisting and hammer stopping, and is characterized in that the lower end of the pile is clamped by a pile clamping device when striking the pile, and the lug boss on the top part of the flange hub is struck by a striking hammer, so the flange and the tubular pile are free from being damaged. The offshore single-pile base structure is applicable to shallow water area and middle-deep water area, and has simple and rapid construction, low cost and strong adaptability.

The invention relates to a hyperspectral remote sensing water depth inversion method based on deep learning, and the method comprises the following steps: carrying out geometric correction on an original hyperspectral remote sensing image of a research region, and carrying out atmospheric correction to obtain the real reflectivity of each waveband; screening an actually measured water depth rangewithin the range of 0-20 meters in the research area; clipping the remote sensing image according to the spatial range corresponding to the screened water depth data, and processing the remote sensingimage into a formatted data file; generating a formatted training data set by matching the spectral reflectivity information of the remote sensing image with the actually measured water depth data according to geographic coordinates; Using Tensorflow and Keras deep learning framework to build a fully connected neural network, 1D- CNN network, 2D-CNN network three deep learning networks to train the research area data; And respectively applying the trained network model to remote sensing image data to invert the water depth of the research area. According to the method, high-precision water depth data can be directly inverted only by taking hyperspectral remote sensing image spectral information of an optical shallow water region as input.

A dynamic carbon and static carbon mutual conversion method includes: planting rank vegetations, and repeatedly cutting and storing to convert 'dynamic carbon' in the atmosphere into 'static carbon' in the biosphere; controlling biomass oxidation quantity to balance the total quantity of 'dynamic carbon' in the atmosphere; intervening soil wind erosion, rock weathering, monsoon circulation and ocean current distribution regularities to restrain 'static carbon' in the biosphere, the hydrosphere and the lithosphere from transferring into the atmosphere; increasing biomass in coastal wetlands, continental shelf shallow areas, rivers and lakes to promote 'static carbon' in the hydrosphere to transfer into the lithosphere; replacing fossil fuels with clean energy to reduce incremental quantityof 'dynamic carbon' in the atmosphere; developing new climate economy to increase bio-carbon products and increase storage of 'static carbon' in the biosphere; clearing 'dynamic carbon' in the atmosphere according to physical and chemical methods so as to regulate the greenhouse effect, eliminate dust haze, slow down global climate change speed and prolong survival time of human on the earth.

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 discloses an ecological restoration method for a municipal eutrophicated river. The method comprises the following steps: arranging a barring and controlling water level system at a barring and controlling water gate of the river; in the main stem of the river, piling cubic meters of earth obtained after desilting to form an along-river gentle slope and a river-center island, wherein a bank slope ratio is 1: 2.5 to 1: 5, and a shoal water zone and a deep and broad water zone are successively formed from a dam of the river to the center of the river; carrying out rock mound type and jack-like concrete block type bottom shape reconstruction on the slope surface of the along-river gentle slope; constructing embankment-zone aquatic plant zones at the river-center island and the along-river gentle slope having undergone bottom shape reconstruction and constructing a plant floating bed bio-zone in an along-river zone; and releasing filter-feeding and omnivore fish, shellfish and shrimps. With the restoration method provided by the invention, the water quality of the river is improved from class IV and V to class III or a higher class; biodiversity of a water area is increase by more than 2 times; the river has better capability in smooth regulation of water storage and flood discharge; and a water system has the further improved functions of underground water supplement, carbon immobilization, oxygen release, climate adjustment, water conservation, etc.

The invention relates to an imitative-ecological one-button factory breeding and domesticating method for frogs. A breeding water source, a breeding facility and ecological breeding are involved. The water source is composed of an underground tunnel water pool, a filtering pool, a heat preservation soil layer and a direct-current ultraviolet sterilizer; a breeding pool comprises a cuboid water pool which comprises two shallow water areas, a deep water area and a dirt depositing area, a cave is formed in one side corner of the pool bottom, a food platform is arranged on the cave, and an upper ramp and a lower ramp are arranged on the wide edge of the food platform. Inverted eaves are arranged above the pool wall, and a water inlet tap with the angle adjustable is arranged on the inverted eaves. No hormone is added for breeding, breeding frogs are soaked in 3% edible salt water for 15 min for disinfection when placed in the pool, and 5% salt water or quick lime water is splashed all over the pool for disinfection every 10 days-15 days in the thetadpole period, the froglet period and the mature frog period; at ordinary times, a medicine bag is made of Chinese gall, cordate houttuynia, common andrographis herbs and other Chinese herbal medicine and placed in the pool to prevent lesions and disinfect, the medicine bag is changed every 20 days; calculated according to the breeding pool of 0.48 m<3>, the medicine bag comprises, 20 g-50 g of the Chinese gall, 20 g-38 g of the cordate houttuynia and 20 g-35 g of the common andrographis herbs.

The present invention discloses a wet land species diversity habitat system construction method which comprises the steps of: deep water area construction; shallow water area construction, wherein the area with the water depth being less than 50 cm is 30%-50% of the total water area, and abundant flow state environment is built; sandy beach construction; swamp area construction including the steps of planting pieces of emerged plants having developed subterraneous stems in a low-lying swamp area which is waterlogged all year round, or appropriately accompanying plants such as softstem bulrush, cattail, water horsetail and marsh marigold and the like, or alternately planting sedge; and aquatic vegetation zone construction including the steps of coastwise arranging emerged plant zones and floating-leaved plant zones in a land and water interface hydro-fluctuation belt zone so as to form an isolating barrier, the depth into the water being at least 10 meters. According to the method, the biology habitat function of a wet land can be newly built or recovered, a good growth and propagation place is provided for wet land biology, and an appropriate ecological environment is provided for birds, amphibians, fishes and periphyton.

The invention discloses a multifunctional dredge boat. A support of a buoyancy supporting leg is welded to a boat body. Navigation signal lamps are welded to the boat body, a cab assembly is fixedly connected with the boat body through screws, and control equipment, circuit equipment and instrument equipment are integrated in a cab. A digging arm assembly is welded to the boat body, a reamer dredge pump is connected with the digging arm assembly, and a power system is fixed on a deck of the boat body through screws. An automatic positioning pile, a compact type hydraulic lifting propeller and the boat body are connected to the reserved support through a pin shaft, and a dredge pipe is laid on the deck of the boat body. By the adoption of the structure, the multifunctional dredge boat overcomes the defects that a common dredge boat in the prior art cannot handle shallow water area and limited space operations easily in places such as rivers, lakes, channels and reservoirs in a city due to the huge size, the common dredge boat cannot be put to good use in inland waterways, energy and labor consumption is large, transporting and transferring are extremely inconvenient, dredging by small-sized machines and manual work can waste time and energy, and the cost is high.

The invention relates to a water transport method, belonging to the technical field of water construction. The thinking of the invention is as follows: by using hollow characteristics of a tubular member, an airbag is arranged in an inner cavity of the tubular member and is aerated so as to lead the tubular member to float on water surface after launching, and then the tubular member is towed to adestination. In the method for floating the tubular member by the airbag in the invention, the tubular member with a floating function is directly fed in water for floating by the airbag without applying a wharf, hoisting equipment, barges and the like, thus having low cost and high efficiency, and the method is applicable to transport in shallow water area due to not occupying fairways. The invention is particularly suitable for water transport of large-scale tubular members the weight of which can reach thousands of tonnage such as pipeline sinking of underwater tunnel, water intake and drainage of water box culverts of a power plant, large-diameter pipelines and the like.

A device for cultivating and maintaining aquatic crustaceans and the method for the same are provided, whereby aquatic crustaceans are cultured in a culture tank having at least one effective resting and / or hiding area that provides visual only or both visual and tactile sensations for aquatic crustaceans. The present invention creates effective resting and / or hiding areas by utilizing the sensitivity of aquatic crustaceans to physical environment, thereby allowing aquatic crustaceans to live within confined spaces in high densities without cannibalizing those fall outside the effective resting and / or hiding areas (the non-effective habitat areas). The device of the present invention can cultivate and maintain aquatic crustaceans successfully in shallow waters and a plurality of which may be vertically incorporated into a multi-layered culture system to bring about higher culture and maintenance densities per unit floor area.

The invention discloses an anchor, particularly a shooting type stable wave-breaking anchor. The anchor is characterized in that the bottom end of a ship body is provided with an electrically controlled launch muzzle; an electrically controlled telescopic rod is arranged in the electrically controlled launch muzzle; one end of the electrically controlled telescopic rod is fixed on the ship body; and the other end of the electrically controlled telescopic rod is movably connected with a spiral taper drilling bit; a steel wire is arranged in the electrically controlled telescopic rod; one end of the steel wire is connected with the spiral taper drilling bit; and the other end of the steel wire is wound on a steel wire wheel; and the steel wire wheel is arranged on the ship body. The shooting type stable wave-breaking anchor can be operated fast and used conveniently, makes up the defect that traditional anchor relies on barriers to apply force, so that the ship can park stably and firmly both in a deep water area and a shallow water area.

The invention discloses an unmanned surface vehicle cooperative formation-based underwater detection method. The method specifically includes the following main processes that: a grid map is established based on environment information, and area coverage data detection is performed after unmanned surface vehicle formation is carried out; and when the current process is trapped in a dead zone or the current round of coverage terminates, a nearest uncovered area is searched, and a path by which unmanned surface vehicles can reach the area is planned, so that the unmanned surface vehicles can continue to execute a task, wherein each unmanned surface vehicle has an obstacle avoidance function and a solution to the malfunction of the unmanned surface vehicle. According to the method, the small-sized unmanned surface vehicles are adopted to perform detection and can freely navigate in a shallow water area; an unmanned surface vehicle formation method is adopted to perform detection, so thatdetection can be performed from different angles, misjudgment caused by angle limitations of a single unmanned surface vehicle itself and ultrasonic probes; water surface ultrasonic probes and underwater ultrasonic probes are adopted, so that an obstacle avoidance range is not limited to water surface obstacles, underwater obstacles can be also detected, and therefore, collision caused by underwater reef can be avoided; and when a certain unmanned surface vehicle suddenly fails, the other unmanned surface vehicles can re-plan a path to continue the task.

The various embodiments of the present invention provide a method for removing a Scholte waves and similar ground roll type waves from a seismic sea bottom data in a shallow water. The method comprises acquiring seismic sea bottom data in a shallow waters, applying a time-frequency-wave number (t-f-k) transform on the acquired seismic sea bottom data, identifying a time-frequency relationship of a surface wave based on a specific wave number, identifying a frequency-wave number relationship of a surface wave based on a specific time, designing a time varying frequency-wave number filter in the time-frequency-wave number domain to separate the surface wave, applying a time varying frequency-wave number filtering process to remove an undesired energy and inversing a filtered record by applying an inverse S-Transform operation and an inverse Fourier Transform operation.

The invention provides a method for breeding crayfishes in winter. The method for breeding the crayfishes in winter comprises the following steps of: (1) selecting and constructing a pond: the pond with a sufficient water source and no silt is selected, the selected pond includes a central shallow water area and a deep water area around the central shallow water area, and a slope is arranged between the two areas for transition; a water inlet and a water outlet are formed in the deep water area of the pond, filter screens of 30-50 meshes are arranged at the water inlet and water outlet, and temperature sensors are arranged on an inner side wall of the pond and the bottom of the shallow water area; a greenhouse is constructed above the pond and covered with thin film, a cover layer is addedonto the thin film, and a thermal insulation device is arranged in the greenhouse; (2) disinfecting the pond; and (3) performing feeding: crayfish seedlings with the length of 0.9-1.1 cm are put intothe cultivation pond prepared in the step (2), and feeding the crayfish seedlings with feed. According to the method for breeding the crayfishes in winter, it is made possible to breed the crayfishesin winter or in cold regions, the incidence is reduced, and the yield is improved.

The invention provides a comprehensive water purification method based on shallow / deep water plants and shoreland vegetation. The method comprises the following steps: acquiring water body information and shoreland information of a water area to be purified; arranging an artificial floating bed in the deep water region of the water area to be purified according to the water body information and shoreland information, and growing aquatic purification plants in the shallow water region of the water area to be purified according to the water body information and shoreland information; and growing shoreland vegetation in the water area to be purified according to the water body information and shoreland information. The artificial floating bed in the deep water region is utilized to absorb nutrient substances in the deep water region, the purification plants in the shallow water region are utilized to absorb nutrient substances in the water body, and the shoreland vegetation is utilized to absorb nutrient substances in the soil and overland runoff, so the omnibearing comprehensive water purification is performed on the shallow water region, deep water region and shoreland of the water area, thereby effectively removing the nutrient substances in the water body and solving the problem of eutrophication of the water body.

A method for ecological agriculture reconstruction of a coal mining subsidence waterlogged area is suitable for ecological system restoration and agricultural planting and breeding structure reconstruction of a mineral product mining subsidence waterlogged area. The method includes the steps that the coal mining subsidence waterlogged area is divided into a flat ground area, a slope area and a subsidence waterlogged area water-containing area; accumulated water is detected, transformation is directly carried out when the accumulated water meets the agricultural water quality standard, and planning is carried out to make the water qualified when the detection result does not meet the agricultural water quality standard; a water storage area water level balance system is constructed, filling reclamation is carried out in the range of the flat ground area, wetland is transformed, soil improvement is carried out to make the wetland become cultivated land, and a movable greenhouse is built; the slope area is divided into three parts for planting arbors, shrubs and forage grass; aquatic vegetables are planted in a shallow water area, and aquatic organisms are bred in a deep water area. Through ecological agriculture reconstruction of the coal mining subsidence waterlogged area, the utilization rate of water and soil of the subsidence area is increased, a complete subsidence area ecological system is constructed, and the method is suitable for ecological environment restoration and control over various coal mining subsidence waterlogged areas in the East of China.

The invention provides a portable underwater robot. The portable underwater robot is provided with hollow housings, a horizontal propeller device and a gear transmission counterweight changing device, wherein the hollow housing is convenient to realize free hovering; an underwater robot interior space formed by the left and right hollow housings can provide a buoyancy force in the water; an electric motor in the gear transmission counterweight changing device is connected with a small gear through a belt to control the small gear to rotate, the small gear is internally engaged with a big gear to drive the big gear to rotate, the center-of-gravity position is changed through changing the position of the big gear, and then a vertical motion direction is adjusted; a left propeller and a right propeller are arranged in the horizontal propeller device; driving motors of the two propellers are controlled by a controller to have different left and right rotation speeds so as to realize that the underwater robot rotates towards the left or the right; when the rotation speeds of the two propellers are as same as each other, the robot goes straight; when the propellers are controlled to rotate forwardly, the robot moves forwards; and when the propellers are controlled to rotate reversely, the robot moves backwards. The portable underwater robot has the advantages of simple structure, small volume and convenient carrying and is suitable for operations in shallow water areas.

The invention provides an artificial propagation method for yellowfin groupers. The artificial propagation method comprises the steps that (1) parents are selected; (2) a parent breeding pond is separated into a deep water area and a shallow water area with water flow communicated, wherein the water depth of the deep water area ranges from 4 m to 5.5 m, and the water depth of the shallow water area ranges from 3 m to 3.5 m; (3) parent fish breeding management is carried out, wherein a, in first 3 weeks during breeding, LED green light and yellow light alternately irradiate the water surface ofthe pond, and after the parent fishes are bred for 3 weeks or longer, the water surface of the pond is irradiated by the LED green light; b, feed is prepared from 3-5 parts of grouper compound feed and 1-2 parts of small fish and shrimp and artificial pellet feed, the parent fishes are fed with the first feed in the first 3 weeks during breeding, and the parent fishes are fed with the second feedafter being bred for 3 weeks or longer; c, the water temperature of the pond ranges from 21 DEG C to 26 DEG C, and water dissolved oxygen is larger than 4.8 mg / L; (4) breeding is enhanced before propagation is carried out; (5) artificial propagation is carried out; (6) zygotes are collected and hatched. According to the artificial propagation method for the yellowfin groupers, the adaptive capacity to environment of the parent fishes is enhanced, the activities of fish shoals are effectively promoted, the feeding rate is effectively increased, the fertility is high, and large-scale artificialbreeding of the yellowfin groupers can be effectively achieved.

The invention provides a method and a system for analyzing resistance and flow field characteristics of a large ship in shallow water. A ship body model of a large ship is established, a calculation domain of a ship model is automatically divided into grids by adopting a cutting body, and the resistance of a ship in shallow water at different navigational speeds and the change rule of a flow fieldare analyzed, so that an optimal navigational speed selection is provided for a large ship to sail in a shallow water area, the safety level of the large ship during shallow water sailing is improved, and meanwhile the reference is provided for the research on dynamic characteristics of the ship.

The invention discloses a method for efficient crayfish breeding in a paddy field. The method includes steps of parent crayfish releasing, circular ditch water level lowering, circular ditch cleaning,rice harvesting, pond drying, escape preventing net arranging, primary water adding, feeding, secondary water adding and parent crayfish transferring. The paddy field is enclosed with an escape preventing net to enable young crayfishes to move in a shallow water area within the net and prevent the young crayfishes from entering deep water areas such as the a circular ditch, high feed utilizationrate is realized, and high growth speed of the young crayfishes is realized. After mating is finished, male crayfishes are all sold to protect the young crayfishes from being eaten by the male crayfishes, artificially screened female crayfishes are released into the paddy field within the net, a favorable survival environment is created for the young crayfishes, natural enemies are controlled, andthe survival rate of the young crayfishes is increased.

A system for offloading LNG (liquified natural gas) from a tanker (26) in shallow waters, for regasing, or heating the offloaded LNG to produce gaseous hydrocarbons, or gas, for pressurizing the gas, and for flowing the gas to an onshore station (56), includes a structure that is fixed to the sea floor and projects above the sea surface and aids in mooring the tanker. In one system, the structure that is fixed to the sea floor is a largely cylindrical tower (12) with a mooring yoke (20) rotatably mounted on its upper end. A floating structure (14) such as a barge that weathervanes, has a bow end pivotally connected to a distal end of the yoke, so the barge is held close to the tower but can drift around the tower with changing winds, waves and currents. The tanker is moored to the tower so the barge and tanker form a combination that weathervanes as a combination. Regas and pressurizing equipment (32, 34) for heating and pressuring the LNG, and any crew quarters (36), are all located on the barge, so a low cost tower can be used. In another system, the structure is a breakwater (180).

The invention provides a method and device for underwater topographic survey of shallow water. The device comprises a GNSS (global navigation satellite system) base station, a movable operating carrier, a worktable, a GNSS mobile station, an IMU (inertial measurement unit), an angle rotary encoder, a divining rod and a data storage chip, and the worktable, the GNSS mobile station, the IMU, the angle rotary encoder, the divining rod and the data storage chip are arranged on the movable operating carrier. A metal ball is fixed to one end, extending underwater, of the divining rod and directly contacts with the underwater terrain. According to the survey method, the mechanical divining rod directly contacts with the underwater terrain, and data abnormality in acoustic or optical underwater survey is avoided; by the GNSS mobile station, the IMU and the angle rotary encoder combined moving trail acquisition techniques, underwater topographic data are dynamically acquired, and accordingly underwater topographic survey precision and efficiency are improved.

A method for massively breeding crays in severe-cold water of a highland includes steps of building a pond comprising a central deep water area and a peripheral shallow water area which are in transition through a hardened zone slope; putting up a mud ridge at the center of the deep water area in length not contacting with the inner wall of the pond; additionally arranging a plurality of water inlet pipes on a small reservoir of the pond; keeping the depth of the deep water area in 2-2.5 meters in winder and 1.2-1.5 meters in summer; breeding crays outside; feeding and casting; performing daily management and water quality management; fishing. By modifying the pond structure to guarantee that the crays smoothly overwinter and injecting warm water into the pond in the early and late winter so as to increase water temperature and prolong growth length of food organisms, fatting and survival rate of juvenile crays reaches more than 80% in the severe cold regions of the highland, and yield per mu reaches more than 700 kilograms.

The invention discloses a foam platform for drilling on waterways. The foam platform comprises a machine station plate used for placing equipment, support legs used for supporting the platform, a drilling operation reserved hole and a hydraulic lifting system of the platform, wherein at least a square foam floating body is fixedly connected to the part below the machine station plate; the foam floating body is arranged in a steel frame; and the machine station plate is fixed on the steel frame directly or indirectly. The foam platform device for drilling on waterways has a simple structure, is connected firmly, can achieve rapid assembly, cannot be influenced by tides or water level changes, and is suitable for being used as a platform for conducting work drilling on waterways in areas, such as shallow water areas, offshore sea, and the like. Compared with a framework working platform, a ship type working platform, an oil drum type working platform, a raft type working platform, a lifting ship body type working platform, and the like, the platform device has remarkable advantages, can meet the use requirement of drilling work in areas influenced by water level lifting, such as offshore sea, river shallow water, and the like, and improves the working efficiency and the economic benefits of drilling on waterways.