539 results about "Reef" patented technology

The invention discloses a reef limestone strength prediction method based on pore feature machine learning, and belongs to the technical field of crossing of geotechnical engineering and artificial intelligence, and the method comprises the steps: obtaining a reef limestone three-dimensional digital core, and extracting pore features after preprocessing; establishing a multi-source pore-physical coupling feature data fusion framework based on the pore features; integrating a random forest and a gradient boosting tree, dynamically weighting parameters in the pore features, designing a composite loss function, performing hierarchical training, and embedding physical constraints to construct a reef limestone strength prediction machine learning model; layered K-fold cross validation is adopted, the robustness of the reef limestone strength prediction machine learning model is tested, and interpretability is verified. According to the method, through data processing, the reef limestone strength prediction machine learning model is constructed and optimized, the relationship between the pore characteristics and the reef limestone strength is deeply excavated, the model prediction accuracy, reliability and interpretability are improved, and an effective solution is provided for reef limestone strength prediction.

The invention provides a marine unfavorable geology reef limestone grouting strength prediction method based on a pore structure. The method comprises the following steps: calculating a reef limestone rock pore value of a reef limestone rock pore volume accounting for a reef limestone rock mass volume; performing size classification on the equivalent diameters of the communicated pores in the reef limestone, and calculating the volume ratio of each type of communicated pores; calculating the pore sphericity of the pore particles according to the pore particle surface area and the pore particle volume; classifying the pore particles according to the pore sphericity, and calculating the sphericity ratio of each type of pore particles; calculating a seepage coefficient based on the pore value of the reef limestone rock, the volume ratio of various communicated pores and the sphericity ratio of various pore particles; calculating the flow of the slurry flowing in the reef limestone rock under the action of different pressures according to the seepage coefficient; and calculating the tensile strength of the reef limestone rock based on the flow before and after grouting. Through accurate permeability analysis, the construction risk and cost are reduced, and meanwhile the bearing capacity of the foundation base is improved.

The invention discloses an island reef shoreline remote sensing extraction method based on a double-branch network, and belongs to the technical field of island reef shoreline remote sensing extraction. Comprising the following steps: S1, acquiring an original satellite remote sensing image of a coral island reef, and cutting to obtain a reef remote sensing image; s2, a shoreline vector label is drawn in the island remote sensing image, and rasterization processing is carried out; s3, cutting the rasterized label and the research area image to obtain tile data; s4, dividing the tile data into a training set and a test set; s5, performing data enhancement on the training set tile data to obtain a processed image data set; and step S6, constructing an SDSPNet model based on the image data set. According to the method, the overall semantic expression ability of the broken shoreline and the lagoon face area is enhanced, and the problems of erroneous judgment of the broken shoreline of the coral island and fuzzy lagoon face boundary in an existing method are solved.

The invention relates to the technical field of deep and far sea small island health monitoring, and discloses a deep and far sea small island health monitoring system and method. A non-intrusive data acquisition system composed of a sensor network, a shore-based camera device and a vibration sensor is adopted, and total-factor real-time monitoring of open sea environment parameters, reef images and the vibration state of a protective building is achieved. Through joint operation of a wave field distribution model and a structural damage prediction model, actually measured data and numerical simulation are combined, and the temporal-spatial resolution of wave parameters of the reef and the evaluation precision of the health state of a protective building are improved; the early warning threshold value is dynamically adjusted through deviation analysis of real-time association of historical disaster data and the current monitoring value, and the timeliness and accuracy of early warning of extreme events are improved; finally, through an automatic triggering mechanism of a multi-stage early warning signal, all-weather and high-reliability safety monitoring guarantee is provided for deep and far sea islands, meanwhile, the manual maintenance cost is reduced, and a remarkable technical synergistic effect is achieved.

The invention discloses a large yellow croaker fry enhancement and release wild training device and method, and relates to the technical field of marine biological resource conservation, and the large yellow croaker fry enhancement and release wild training device comprises a water tank for containing water, and a plurality of fish reefs are placed in the water tank; the light source is arranged above the water tank; the plurality of wave making pumps are uniformly arranged on one side of the inner wall of the water tank; the throwing structure is used for throwing natural enemy pheromones into the water tank; the camera is arranged on the inner wall of the water tank; the controller is electrically connected with the camera, the light source and the wave making pumps, the camera is used for collecting behavior characteristic information of the large yellow croaker in wild training and sending the behavior characteristic information to the controller, and the fish behavior analysis system comprehensively analyzes swimming and fish reef use conditions of the large yellow croaker fry in the water tank and analyzes and judges the wild training effect of the large yellow croaker fry. The method has the advantages that the capability of the larimichthys crocea fry adapting to the marine natural environment is enhanced, and the survival rate of the released fry is increased.

The invention relates to the technical field of biological coast evaluation, in particular to a shellfish reef artificial biological coast construction effect evaluation method and a shellfish reef artificial biological coast construction effect evaluation system. According to the expected construction requirement of the shellfish reef artificial biological coast, multiple capture channels are obtained through evolution tensor decomposition in the dynamic evolution simulation model, the capture channels are used for evaluating and analyzing the construction effect of the target biological coast, and the current revetment inhabiting effect, revetment development capacity and shellfish reef life quality of the target biological coast are obtained; fitting and evaluating the inhabitation effect of the current revetment, the development capability of the revetment and the life quality of the shellfish reef through polar coordinates of a multi-dimensional evaluation polar map frame, and performing standard grade judgment to generate a construction effect evaluation result of the artificial biological coast of the shellfish reef. According to the method, a shellfish reef construction effect quantitative evaluation system taking the revetment inhabiting effect, the revetment development capability and the shellfish reef life quality as three dimensions can be constructed, and the rationality and scientificity of shellfish reef artificial biological coast construction effect evaluation are improved.

The invention discloses an unmanned ship hunting confrontation decision-making method based on multi-agent course reinforcement learning. The method comprises the following steps: constructing a marine confrontation simulation environment comprising a dynamic target and multiple reefs; designing a normalized state space to represent a friend or foe movement situation, a multi-scale reward function and a continuous action space; a self-adaptive course scheduler is deployed in the centralized training decentralized execution framework, and the training environment complexity, the action noise intensity and the strategy entropy coefficient are dynamically adjusted; and training the decision model by adopting a multi-agent near-end strategy optimization (MAPPO) algorithm. According to the scheduler, the environmental difficulty is dynamically upgraded and degraded based on the sliding window success rate, the training round number and the performance stagnation counter, and the problems of sparse reward and strategy generalization are solved. Experiments show that the method significantly improves the hunting success rate, shortens the task time and reduces the collision rate.

The invention discloses a device for reinforcing a seabed coral sand and reef limestone foundation, which comprises a vacuum pump and grouting machine connecting device fixedly connected to the input end of a main conveying pipeline; the output end of the main conveying pipeline is connected to a technical device at the top of the hollow steel pipe cage through a sealing joint; a novel anti-pulling anchoring device is integrated on a bottom base of the hollow steel tube cage and is formed by coaxially sleeving a hollow pressure-bearing steel tube with a telescopic supporting assembly; radial slurry outlet holes and guide sliding grooves which are distributed at equal intervals are axially formed in the pipe wall of the hollow pressure-bearing steel pipe; the outer surface of the hollow steel tube cage is coated with the magnetic conductive enhanced grid in a concentric circle structure; the composite grouting guide pipe is connected with a grouting opening in the bottom end of the hollow steel pipe cage through a rotary connector and connected to an auxiliary grouting pipeline driven by a double-liquid synchronous grouting machine through a flow divider. The distributed monitoring system, the special magnetic slurry, the microorganism slurry and the ultrasonic resonance generator are integrated in the device. The bearing capacity and stability of the seabed coral sand and reef limestone foundation can be improved.

The invention belongs to the technical field of mariculture, and particularly discloses a grazing and breeding combined proliferation maintenance type anchor reef which comprises a base, a prismatic table body, a center supporting column and an embedded cabin, the outer vertical face of the base is provided with inclined biological micropores which are high in inside and low in outside, the middle of the top face of the base is provided with a silt collecting groove, and a biological shell is embedded in the inner wall of the silt collecting groove; a penetration structure is arranged at the bottom of the base; the prismatic table body is clamped above the base and is hollow, a plurality of inhabiting channels are formed in the side surface, and a flow through hole is formed in the center of the top surface; the center supporting column penetrates through the center of the base and the center of the prismatic table body, an embedded cabin is integrated in the middle of the center supporting column, a bionic nest is arranged in the embedded cabin, and a biological egg attachment base is fixed in the nest; and the top end of the central supporting column is connected with the anchor chain connecting piece. The anchoring reef can be used as an anchoring system for fixing a culture facility, can also play a role in resource proliferation and maintenance, has the advantages of being stable in structure, convenient to assemble and transport and suitable for living beings to inhabit, and realizes organic combination of ecological restoration and culture production functions on the anchoring reef.

The invention discloses a sepiella maindroni stepped wild domestication device which comprises a plurality of net cages arranged from inside to outside, each net cage is provided with a plurality of meshes, and the meshes in different net cages are gradually increased from inside to outside in a stepped manner; a plurality of suspension type fish reefs are arranged in the net cage, each suspension type fish reef comprises a plurality of single bodies horizontally installed on the floating rope, and each single body is a shell with a plurality of small holes formed in the shell wall. An area which is flat in terrain, relatively gentle in water flow, rich in plankton and about 10 m in water depth is selected near a sea area to be released as a domestication field, the device is put into the domestication field, and in-situ wild domestication is carried out on sepiella maindroni larvae; and the predation capability, the capability of avoiding enemies and the capability of coping with environmental stress after entering a natural sea area are improved, so that the enhancement and release effects are improved.

The invention discloses a cuttlefish reef integrating egg laying and juvenile rearing. The floating fish reef is positioned above the bottom attachment reef; the floating body is arranged on the upper frame; the shading clay plate is arranged in the middle of the upper frame; the upper netting is arranged at the side part of the upper frame; the clay pipe is arranged on the upper netting; the attachment rope is transversely connected with the inner side part of the upper frame; the clay box is hung on the attachment rope; the pile rope is connected with the upper frame and the pile; the lower netting is arranged outside the lower frame, and an entrance is formed in the lower netting; the upper end of the support is connected with the lower frame, and the lower end of the support is connected with the foot margin. Abundant attaching organisms such as algae are attached to the surface of the floating fish reef, and larva cuttlefishes and other animals are attracted to gather. The bottom fish reef serves as a cuttlefish spawning base, meanwhile, the flow field environment is changed, seabed nutritive salt is driven to be conveyed to the upper middle layer, the primary productivity of a sea area is improved, and an inhabiting and foraging place is provided for young cuttlefishes. The cooperative linkage effect of the floating fish reef and the bottom attachment reef is good, and the comprehensive utilization efficiency of ocean resources is improved.

The invention discloses an anti-seismic protection structure of a coral island reef limestone underground chamber and a construction method.The anti-seismic protection structure of the coral island reef limestone underground chamber comprises a chamber hole, an elastic shock insulation layer, a pouring layer, a shock insulation support, a viscous damping component and a mild steel damper; the seismic isolation support and the pouring layer bear vertical loads together, the viscous damping component and the side wall bear lateral confining pressure of reef limestone, under the earthquake effect, the elastic seismic isolation layer can preliminarily absorb earthquake energy, and after three-direction seismic waves are transmitted to the structure, the seismic energy of X-direction seismic waves and Y-direction seismic waves is consumed by the seismic isolation support at the bottom layer through vibration and friction, so that the seismic isolation effect is achieved. X-direction and Y-direction deformation and displacement of the chamber are reduced, Z-direction seismic waves absorb seismic energy through the seismic isolation support, so that energy continuously transmitted to the upper portion is avoided or reduced, and the vertical vibration response of the structure is relieved. At the arch crown part, the mild steel damper can absorb and dissipate energy through vibration and plastic deformation of an energy dissipation component arranged on the mild steel damper.

An application and a composition of bioremediation agents and cremated remains forming underwater sanctuaries and structures by coral reefs comprising a homogenous mixture of calcium compounds, clay, cement, earthworm enzymes, and human / animal ashes. The composition will benefit nearby reefs with added calcium for rehabilitating reefs and earthworm enzymes with detoxifying properties. The underwater sanctuaries and structures will provide habitats for wildlife.

The invention discloses an assembly type ocean suction type caisson foundation structure and a construction method thereof, and belongs to the field of caissons, the assembly type ocean suction type caisson foundation structure mainly comprises a caisson assembly, the caisson assembly comprises a plurality of sets of assembly type caisson bodies, reinforcing steel bars are fixedly installed in the caisson bodies, open holes are formed in the caisson bodies, oblique openings are formed in the bottoms of the caisson bodies, and the caisson bodies are fixedly installed in the open holes. According to the fabricated ocean suction type caisson foundation structure and the construction method thereof, the bionic plates and the caisson body can enter the sea together, so that the holes can make contact with seawater, and therefore the bionic plates simulate the reef environment through the holes; according to the caisson, a habitat is provided for marine organisms, a food chain is constructed, an ecological chain is repaired, biological diversity is improved, wave force can be weakened, base scouring can be reduced, structural fatigue damage can be reduced in engineering, meanwhile, a protective layer is formed through biological attachment, and caisson durability is improved.

The invention discloses a composite bio-based suspension purification system based on a near-natural water ecology concept, and belongs to the technical field of water ecology diversity restoration. The system is composed of an emergent aquatic plant ecological design module, a bio-based suspension core, a microorganism cultivation bed, an intelligent underwater oxygenation and aeration module, an artificial ecological fish reef and a submerged plant planting module. Wherein the bio-based suspension core is of a four-layer gradient composite structure and comprises a polyester fiber filler layer, an active carbon fiber sponge layer and a palm fiber bio-base layer, and synergistic purification of physical adsorption, chemical degradation and biological metabolism is achieved. The intelligent aeration module dynamically regulates and controls the aeration intensity through multi-parameter sensor linkage and a fuzzy PID algorithm, and the oxygen transfer efficiency is larger than or equal to 35%. According to the invention, through coupling design of aperture gradient distribution (80-92% porosity) of the four-layer gradient bio-based suspension core and a dynamic response threshold value of a fuzzy PID algorithm, collaborative optimization of carrier structure parameters and control system parameters is realized for the first time. The innovative technology not only improves the stability and diversity of an ecological system, but also strengthens the natural purification capacity of a water body, and provides a new thought for water environment protection.

The present invention discloses a sea dragon-derived antimicrobial peptide, SsPle, for antimicrobial applications in the complex environments of tropical islands and reefs. The amino acid sequence of this antimicrobial peptide is shown in SEQ ID NO. 3. This antimicrobial peptide, SsPle, exhibits good water solubility, broad antimicrobial activity, and highly stable antimicrobial properties under high temperature, high salt, and ultraviolet irradiation conditions. It can inhibit the release of free bacterial endotoxins and has significant application prospects as an eco-friendly antimicrobial agent in the unique environments of South China Sea islands and reefs.

The invention relates to the technical field of ecological monitoring, in particular to a resident-free island resource monitoring method based on a spatial three-dimensional model, and the method comprises the following steps: S1, building a remote sensing image interpretation information base; s2, based on the remote sensing image interpretation information base, generating an island space three-dimensional model containing island land terrain and shoreline distribution; s3, generating a total element three-dimensional dynamic map; s4, the interpretation result and the total element three-dimensional dynamic map in the S3 are superposed, and a reef area comprehensive distribution map is generated; s5, calculating the island resource development intensity and the ecological risk level, and outputting an island ecological assessment report; and S6, generating an island resource monitoring report. According to the invention, unmanned aerial vehicle aerial survey, GNSS measurement, depth sounding technology, image interpretation and ecological assessment are combined, a high-precision total-factor three-dimensional dynamic monitoring system is constructed, accurate analysis and visual expression of the current island resource utilization situation are realized, and scientific decision support is provided for island management and ecological protection.

The invention relates to a deep sea island tough wharf capable of resisting bidirectional earthquake action, comprising: a panel, the bottom of which is provided with a panel beam; the supporting piles are arranged in a scattered mode in the extending direction from the sea face to the land and comprise straight pile bodies and crossed pile bodies, the straight pile bodies comprise the first straight pile bodies and the second straight pile bodies, the first straight pile bodies are arranged on the offshore side in rows, and the second straight pile bodies are arranged on the near-land side in rows; the crossed pile bodies are arranged between the first straight pile body and the second straight pile body in rows; the first bidirectional damping device is arranged at the top of the first straight pile body, one end of the first bidirectional damping device is connected with the first straight pile body, and the other end of the first bidirectional damping device is connected with the panel beam; the second two-way damping device is arranged at the top of the cross pile body, one end of the second two-way damping device is connected with the cross pile body, and the other end of the second two-way damping device is connected with the panel beam. By optimizing the arrangement of the pile bodies of the wharf and arranging the damping device in a combined mode, the energy dissipation capacity and the overall stability of the wharf under the bidirectional earthquake effect are effectively improved.

The utility model discloses a large-scale steel structure assembly type multifunctional artificial fish reef with high environment adaptability to deepwater, which relates to the technical field of marine ranch construction, and comprises a plurality of groups of support column components, each support column component comprises a first upright post, a second upright post and a third upright post which are sequentially lowered from inside to outside, the first stand column, the second stand column and the third stand column are detachably connected through a plurality of first cross beams, the multiple sets of supporting column assemblies are arranged at equal intervals in the circumferential direction and connected through a plurality of second cross beams, and ecological flow guide plates are detachably assembled on the inner second cross beam and the outer second cross beam correspondingly. The bottoms of the first stand column, the second stand column and the third stand column are each provided with a stable anchor disc. The problems of subsidence and deposition of the reef body on the soft soil foundation are solved, and the adaptive capacity of the reef body to the environment is improved; the function of various flow field conditions is realized through the flexibly adjustable ecological flow guide plate, and the required flow field effect can be formed by adjusting the distribution and angle of the ecological flow guide plate according to the flow field requirement.

The invention discloses an island remote sensing image substrate classification data set construction method and device, electronic equipment and a storage medium. The method comprises the steps of obtaining island remote sensing data; based on the priori island substrate classification system, a target island substrate classification system is built according to the feature condition of each substrate category; obtaining a pre-selected ROI sample in the island remote sensing data; carrying out substrate category analysis based on the ROI sample to obtain a low-separation-degree target substrate category set; performing preliminary classification by using a support vector machine based on the ROI sample to obtain a preliminary classification result; and based on the target substrate category set, performing correction processing on the preliminary classification result in response to a manual correction instruction of the target object to obtain an island substrate classification data set. The method provides an effective and feasible technical path for realizing automatic and standardized construction of the high-precision substrate classification data set of the open sea island reef, and can be widely applied to the technical field of substrate classification.

The invention provides a method and a device for efficiently proliferating sepiella maindroni by combining grazing and raising, and belongs to the field of aquatic animal proliferation. An efficient breeding method for sepiella maindroni integrating grazing and breeding comprises the following steps that an appropriate sea area is selected, fertilized eggs are bred in a breeding facility laid in the downstream direction of a normal fish breeding net cage, namely an empty net cage containing an artificial floating reef, the periphery of the empty net cage is provided with an algae-mussel flow blocking ecological rope, and a cover net is arranged above the empty net cage; the newly hatched cuttlefish can stay in the proliferation facility empty net cage for a long time due to the characteristics of loving reefs and drilling the net and strong space awareness, and slowly escape into natural water after gradually adapting to the proliferation environment. According to the proliferation method, cuttlefishes gradually adapt to the natural environment of the sea area, meanwhile, cuttlefish larvae are well protected enough in the fragile incubation initial stage through protection measures such as net cages, and therefore the proliferation survival rate and the maintenance efficiency are improved, and efficient proliferation is achieved.

The invention relates to a protection game method based on prospective situation awareness and region-triggered adaptive defense, which aims at an island protection scene, aims at intercepting a target to protect the safety of high-value fixed targets such as an island to the greatest extent as a main task, and aims at enhancing the anti-saturation strike capability as a secondary task. Firstly, a rolling time domain algorithm is optimized to improve interceptor response efficiency; on the basis, the own modeling is simplified by smoothing the enemy trajectory, and the planning and deployment time of the interception strategy is shortened; and the position of the enemy unmanned ship is pre-judged by combining a foresight situation awareness module, and a high-value important target is protected by using a region triggering type self-adaptive return interception mechanism through a tail end state. The method plays an important role in complicated and severe marine environments such as marginal-coast island reef defense and the like.

The invention provides a measurement control point-free island stereo image pair extraction high-precision DSM method, which comprises the following steps of: firstly, carrying out semi-global dense matching by adopting a semi-global dense matching algorithm to obtain a disparity map; secondly, performing coordinate three-dimensional positioning of the rational function model, and processing longitude, latitude and height coordinates to obtain a three-dimensional point cloud without deformation; and finally, realizing point cloud reconstruction DSM, and generating a DSM three-dimensional model. Experimental results show that the method for reconstructing the DSM by the high-resolution satellite stereo image pair is well applied to World-View3 satellite images, and the DSM three-dimensional model of the island reef can be constructed.

The invention relates to marine fish breeding, and particularly discloses an indoor full-artificial breeding method for black epinephelus, which specifically comprises the key technical links of nutrient enrichment of parent fish, hormone induced spawning, artificial insemination and fertilized egg incubation, indoor breeding of fry, compound feed domestication and the like. By controlling water temperature, illumination, salinity and nutritional conditions, synchronous maturation and efficient ovulation of parent gonads of the epinephelus nigatosus are achieved, the fertilization rate reaches 95% or above, and the hatching rate exceeds 85%. According to the method, the whole-process artificial controllable breeding of the epinephelus nigatosus from the parent fish to the fry is realized, a new variety is provided for the epinephelus culture industry, and a feasible technical approach is also provided for the artificial breeding and improved variety breeding of the wild epinephelus nigatosus in the island reef of the South China Sea.

The embodiment of the invention provides a sea surface wind wave detection method and system based on Beidou reflected signals. The method is applied to the technical field of sea surface wind wave detection, and comprises the following steps: acquiring and processing Beidou direct reflection signals through a double-antenna system to obtain feature and orbit data; calculating reflection point positions and tide correction according to the characteristic orbit data to obtain reflection area characteristics; evaluating sea surface roughness based on the regional features and identifying interference to obtain scattering features; modeling and inverting wind wave parameters according to the scattering characteristics to obtain original data; fusing and screening multi-source observation according to the original data to obtain quality control data; and evaluating and optimizing system parameters by using the quality control data to obtain a storm detection result. According to the invention, interference sources such as land reefs and the like can be effectively identified and processed, and Beidou reflected signal sea surface wind wave detection based on high-precision wind wave parameter inversion is realized.

The invention discloses a bimodal-based breeding operation fishing boat target detection device and method in a long-distance complex scene, belongs to the field of image target detection, and is used for solving the problems that in the long-distance complex scene, a fishing boat in long-distance fishing operation is not obvious in feature and is easily confused with seeing a sea house target and a reef target. The first backbone network is used for inputting a visible light modal image and comprises a first feature extraction layer, and the output of the first feature extraction layer comprises visible light features; the second backbone network is used for inputting an optical flow modal image, the second backbone network comprises a first feature extraction layer, and the output of the first feature extraction layer comprises optical flow features; and the fusion module is arranged between the first feature extraction layer of the first backbone network and the first feature extraction layer of the second backbone network, inputs visible light features and optical flow features, and outputs fusion features including channel attention features and space attention features.

The invention relates to the field of ocean engineering production, in particular to a floatable building for an island reef, which comprises a hull structure, a floating building body and an adjusting plate, the right end of the hull structure sinks into the seabed along one side of the island reef, and the adjusting plate is arranged at the top of the hull structure and is integrally of an L-shaped structure; according to the floating building, the pushing claw anchoring assembly is arranged, a fixing piece, an auxiliary plate, a pushing claw plate and a pushing claw piece of the pushing claw anchoring assembly are matched with one another, the pushing claw piece is driven by the gravity of the ship body to laterally extrude seabed soil, the seabed soil is accumulated in the pushing claw plate, and the seabed soil is separated from the ship body; the V-shaped push claw pieces with the sharp ends increase the contact area and the road holding force with seabed soil, the anchoring effect of the floatable building on the seabed is improved, meanwhile, the driving assembly drives the three sets of push claw pieces to do radial movement on the seabed through gravity transmission of the hull structure to achieve radial fixing, and the stability is further enhanced.

The invention discloses a three-dimensional whole-water-layer ecological reef which comprises a surface-layer suspension reef, a middle-layer inhabiting reef and a bottom-layer fishing reef which are sequentially connected from top to bottom through iron chains. The top of the surface layer suspension reef is a plane, and marine products with high illumination requirements are planted on the surface layer suspension reef; a plurality of inhabiting holes are formed in the four sides of the middle-layer inhabiting reef and are used for building a multi-three-dimensional habitat and providing a fish and algae young breeding place in a middle water layer; the four sides of the bottom layer fishing reef are of hollow structures, and a balance weight base is fixedly arranged around the bottom of the bottom layer fishing reef. The three-dimensional whole-water-layer ecological reef is distributed on a whole water layer, seawater layer distribution is reasonably utilized, aquatic economic crops are cultivated on the top and used for improving economic benefits, the middle and the lower portion provide inhabiting and breeding places for species on the corresponding layers, and the ecological value is improved; the basalt fiber inner core is adopted in the three-dimensional whole-water-layer ecological reef, and the three-dimensional whole-water-layer ecological reef cannot rot and rust even if soaked in seawater, so that the three-dimensional whole-water-layer ecological reef cannot be exploded from the inside and can be used in seawater

1. The name of the design product: over the river stone (reef 2). 2. The use of the design product: the design product is a child toy equipment over the river stone, used for sensory training and expansion activities. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective drawing.

The invention discloses a reachable domain-based ship navigation risk assessment method, which comprises the following steps of: constructing kinematics and dynamics equations of a ship, and considering environmental interference factors; discretizing the model, and determining the state of the ship and a discrete motion model with limited control; calculating the reachable domain of the ship at the future moment; obtaining the position and geometric parameters of the island reef, and determining the safety domain of the island reef; and based on the reachable domain, carrying out navigation risk assessment between the ships and between the ship and the island reef. According to the method, through modeling and reachable set calculation, the future state uncertainty of the ship in a complex environment can be effectively predicted, a potential navigation risk area is identified, and a reliable theoretical basis is provided for safe navigation. Compared with a traditional method, the method can more comprehensively consider ship dynamic characteristics, environmental interference and multi-target navigation safety requirements, and the navigation safety is improved.