2610 results about "Oceanography" patented technology

The invention discloses a deep and far sea cage culture typhoon disaster prevention and after-disaster rapid recovery method, which comprises the following steps of: carrying a high-definition camera by using an unmanned aerial vehicle to aerially photograph a cage water surface structure before a disaster, acquiring an underwater image by an underwater robot through sonar hierarchical scanning and the camera, and generating structure data and fish school data before the disaster; weak points such as frames, nettings and anchor chains are analyzed through three-dimensional modeling and are repaired and reinforced, the stocking density is optimized in combination with typhoon information, the risk of facility damage and fish loss is reduced, structural data and fish school data are repeated after a disaster, and the pre-disaster standard serves as a reference to compare and evaluate the frame damage degree, the nettings damage degree, the anchor chain breakage degree and the fish school escape or death degree; and generating a graded repair scheme and a disaster relief plan. According to the method, the detection precision and the evaluation efficiency are improved through multi-device cooperation and data fusion, the damaged part is rapidly positioned, the recovery strategy is optimized, and an efficient disaster prevention and reduction and after-disaster rapid recovery solution is provided for deep and far sea cage culture.

The invention discloses a gravity type submerging net cage parameter design optimization method, and relates to the field of mariculture equipment structure optimization, and the method comprises the steps: collecting the multi-period marine environment data of a target sea area, and constructing an environment load sequence with a time-varying characteristic; establishing a three-dimensional coupling finite element model, performing disturbance analysis on a plurality of structure control parameters, and identifying a key design parameter set based on a response sensitivity function; and constructing a multi-objective optimization model including floating and sinking time control, maximum stress minimization and attitude offset constraint, performing global optimization by adopting an adaptive genetic algorithm, obtaining an optimal parameter solution, substituting the optimal parameter solution into the simulation model for dynamic response verification, and if a response index is converged to a target interval, outputting the optimal parameter solution as final design configuration. According to the method, systematic optimization of structural parameters of the submerging and surfacing net cage can be achieved, the stability and safety of the submerging and surfacing net cage under complex sea conditions are improved, and the method has high engineering applicability.

The invention relates to the technical field of mountainous river fish habitat habitat restoration, and relates to a mountainous river fish habitat restoration method based on numerical simulation optimization, comprising: acquiring habitat data of a mountainous river fish habitat, and performing preliminary ecological restoration measures on the mountainous river fish habitat; constructing a numerical simulation model to predict the erosion and deposition evolution result of the fish habitat in the mountain river after the preliminary ecological restoration in a set period, and identifying an area of which the erosion and deposition evolution degree meets a preset threshold value in the set period; and carrying out riverbed substrate transformation on the identified area based on the target fish, evaluating the habitat improvement effect under the combined action of the preliminary ecological restoration measure and the riverbed substrate transformation through a habitat suitability model, and completing the restoration of the fish habitat in the mountain river based on the evaluation result. According to the method, dredging, spur dike and substrate transformation are combined, and numerical simulation optimization is combined, so that the effectiveness, continuity and scientificity of restoration of the fish habitat in the mountain river are improved.

The invention discloses a riverway longitudinal section determination method based on a riverway section terrain and related equipment. The method comprises the following steps: acquiring main groove section data of a plurality of sections in a target river reach, wherein the main groove section data comprises a main groove section area of each section under a corresponding section flat beach water level; for each section, a target water level value is determined from a plurality of preset water level values larger than the thalweg point elevation of the section, the channel range interval where the thalweg point of the section under the target water level value is located is a target interval, and the channel section area in the target interval is larger than or equal to the product of the main channel section area and a preset proportion value; taking the target water level value as the deep groove elevation of the corresponding section; and determining the longitudinal section of the river channel of the target river reach by utilizing the deep groove elevations of the multiple sections in the target river reach. Sawteeth in the longitudinal section of the riverway can be reduced, so that the longitudinal adjustment rule of the riverway can be accurately identified, and the level requirement on related technicians is reduced.

The invention provides a ship target segmentation method and system based on an improved Harris eagle optimization algorithm, and relates to the technical field of image processing and mode recognition. According to the technical key points, the method comprises the following steps: processing an airborne grayscale image including a sky domain, a sea area, a marine ship and a coastline, and obtaining a region-of-interest image; obtaining an optimal segmentation threshold value by using an improved Harris eagle optimization algorithm, and segmenting the airborne grayscale image by using the optimal segmentation threshold value to obtain a segmented image based on the optimal segmentation threshold value; and fusing the region-of-interest image and the segmented image based on the optimal segmentation threshold to obtain a final segmented image. According to the method, the high response area of the ship target is accurately locked through the SIFT features, and adaptive threshold optimization is realized in the target gray band in combination with the improved Harris eagle optimization algorithm, so that the ship target segmentation precision and robustness under the complex sea condition are remarkably improved, and high-reliability technical support is provided for maritime affair monitoring and other scenes.

Device (300) for supplying a grey water tank (586) with fresh water from a fresh water connection (302), wherein the fresh water connection (302) has an outlet opening (316), characterized in that in the flow direction (S) of the fresh water, downstream of the fresh water connection (302), there is a fresh water tank (304) for temporarily storing the fresh water, which is connected to the fresh water connection (302).

A multi-source remote sensing data-based method for monitoring the concentration of suspended matter in an ocean dumping area, belonging to the technical field of remote sensing and monitoring of the concentration of suspended matter in ocean dredging and dumping areas. The method comprises: 1) selecting a certain sea area comprising a dumping area as a research area to acquire actually measured suspended matter concentration data; 2) separately acquiring the actually measured suspended matter data, and preprocessing remote sensing images; 3) matching the acquired data to form a data set, constructing a suspended matter concentration inversion model, and obtaining an image of the spatiotemporal distribution of the concentration of suspended matter in a body of water of the research area; and 4) constructing a multi-source remote sensing spatiotemporal data fusion model to obtain a high-spatiotemporal-resolution diagram of the spatiotemporal distribution of the concentration of suspended matter in the dumping area, and monitoring the conditions of a change in the concentration of suspended matter in the ocean dumping area. The present invention has advantages such as a short monitoring period, high spatiotemporal resolution, and a wide observation range, and can synchronously monitor a sea area having a large range. The present invention can also provide data support for operations such as supervision and management of ocean waste dumping, monitoring and management of an ocean waste dumping area, selection and division of a waste dumping area, supervision of use, and monitoring for illegal dumping.

A system is for cooling at least one computing device using water. The system has a body of water defining a first waterline and a structure at least partially submerged in the body of water. An internal volume of water defines a second waterline. At least one outlet drains water from the internal volume of water to the body of water. A container is at least partially submerged in the internal volume of water and has at least one computing device that generates heat in use. An inlet pipe has a pump to move water from the body of water to the internal volume of water. A flow path of water is provided across the container towards the at least one outlet. The second waterline is at a height above the first waterline to drive the flow path to provide cooling of the container and computing device therein.

The invention belongs to the technical field of ecological restoration and wetland engineering, and discloses an ecological corridor-based abandoned fishpond ecological restoration method, which comprises the following steps: S1, land forest restoration: planting saline-alkaline tolerant vegetation around an abandoned fishpond and in a land and abandoned fishpond transition area in a layered manner; s2, mangrove forest wetland construction: performing microtopography modification to adjust the bottom mud elevation, and planting mangrove forest plants in a layered manner; s3, ecological corridor construction: constructing an ecological corridor on one side of the abandoned fishpond and the land, and constructing an ecological corridor on one side of the abandoned fishpond and the ocean; s4, ecological monitoring and maintenance: carrying out hydrological, tidal and biological detection regularly; the three-dimensional ecological corridor system of'land forest-mangrove forest wetland-ocean 'is constructed, and the abandoned fish pond is transformed into the mangrove forest wetland, so that not only are biodiversity improvement and ecosystem connectivity realized, but also stable migration and inhabitation space can be provided for terrestrial and aquatic organisms.

The invention discloses a sailing ship safety situation awareness system, and belongs to the technical field of data analysis. The method is used for solving the technical problem that in an existing scheme, multi-dimensional data analysis and timely and reliable early warning cannot be carried out on complex sea conditions, and consequently the coping capacity of the complex sea conditions is weak. Through the whole process of biological anchoring anomaly suppression, data fusion and dynamic feature extraction, the limitation that traditional ship perception depends on a physical sensor can be broken through, high-precision perception of environmental risks and ship states under complex sea conditions is achieved, and compared with a traditional method, the abnormal sea conditions can be recognized in advance, and the method has the advantages of being high in practicability. The robustness of the data and the detection rate of small probability and high influence events can be effectively improved; cross-scale modeling is realized through deep coupling of a microscopic physical mechanism and macroscopic data features; the constructed multi-dimensional risk assessment matrix not only can output a risk value, but also can provide a risk propagation path, and can effectively improve the risk assessment precision of the ship under a complex sea condition.

The invention discloses a multi-scale sea surface electromagnetic scattering calculation method and device based on marine environment elements and a storage medium, and belongs to the technical field of marine detection and physical remote sensing. The method comprises the following steps: calculating a tension wave sea spectrum according to an Elfouhail sea spectrum in combination with a Longuet-Higgins directional spectrum; a JONSWAP sea spectrum is combined with a Longuet-Higgins directional spectrum to calculate a gravity wave sea spectrum; superposing the tension wave on the gravity wave according to the slope by using a linear superposition method, and calculating a self-adaptive cut-off wave number; the contribution of small-scale waves to scattering is calculated by adopting an integral equation method, mirror scattering of large-scale waves is counted by adopting a Kirchhoff approximation method, and statistics and fusion are carried out on each scale wave according to the self-adaptive cut-off wave number, so that an electromagnetic scattering value is obtained. According to the method, a sea surface geometric calculation method based on real marine environment element driving is adopted, and accurate calculation is performed aiming at sea surface scattering characteristics under different sea conditions in combination with an integral equation method-Kirchhoff approximation electromagnetic scattering calculation model of an adaptive cut-off wave number, so that the calculation precision of scattering intensity is improved.

The invention discloses a trend prediction and early warning method applied to health evaluation of a bay ecological system, and relates to the technical field of bay ecological early warning, and the method comprises the following steps: collecting monitoring data of bay ecology, and dividing the monitoring data into historical data and real-time data, wherein the monitoring data comprises water quality data, geological data and hydro meteorological data, the collected monitoring data is preprocessed, bay ecosystem impact factors are screened, the bay ecosystem impact factors comprise physical impact factors and chemical impact factors, and the preprocessed historical data and the bay ecosystem impact factors are utilized. According to the method, trend prediction is carried out on the health condition of an ecological system in a period of time in the future by constructing the gulf ecological prediction model based on historical data and real-time monitoring information, so that related departments and the public can take actions before problems occur, and potential ecological risks are effectively prevented.

The invention discloses a ship identification and water area safety situation analysis method and system. The method comprises the following steps: acquiring water area environment multi-source data; based on a ship target detection model and a target identity matching method, analyzing the water area environment multi-source data, and identifying a ship target; acquiring a historical ship track based on a ship track interpolation smoothing method according to the ship target and water area environment multi-source data; and obtaining a ship navigation safety situation score by using the ship track prediction model and the composite artificial potential field model according to the ship historical track and the water area environment multi-source data. According to the technical scheme provided by the invention, a ship target is identified through an SDRV method and a target identity matching method, abnormal track points are screened, a historical track is interpolated and smoothed, and ship navigation safety situation scoring is carried out based on track prediction and a composite artificial potential field; multi-source dynamic information of a ship target can be integrated, and ship identification and safety situation analysis are effectively supported.

The invention discloses a fishery sea fishing resource assessment method and device, electronic equipment and a storage medium. The method comprises the steps of obtaining multi-dimensional data information of a to-be-assessed target sea area; determining a plurality of evaluation factors in the data information of each dimension; constructing a hierarchical structure model of fishery and sea fishing resource evaluation based on the multi-dimensional data information and the corresponding evaluation factors; based on the hierarchical structure model, determining the data information of each dimension and the index weight of the corresponding evaluation factor through an analytic hierarchy process; constructing a fuzzy relation matrix through fuzzy mapping representation based on the evaluation factor in combination with a preset comment set; performing fuzzy synthesis operation according to the index weight and the fuzzy relation matrix to obtain a fuzzy comprehensive evaluation result; and determining a final evaluation result of the target sea area based on the fuzzy comprehensive evaluation result. The method can accurately realize fishery sea fishing resource evaluation, and can be widely applied to the technical field of fishery resource evaluation.

The invention discloses an integrated fan pneumatic-hydrodynamic-servo-elastic-plastic coupling analysis system and method, and belongs to the technical field of offshore fan numerical simulation calculation. According to the method, a coupling model of an offshore wind turbine under the environment load effect is established, a rotor cabin assembly is simulated through a multi-body dynamics method, and interaction of a supporting structure and pile soil is simulated through a finite element method. By introducing a prediction correction loose coupling algorithm, joint simulation between a multi-body system and a finite element system is realized. The method is not only suitable for coupling dynamic response analysis of the offshore wind turbine under the action of conventional wind wave load, but also suitable for elastic-plastic coupling analysis of the offshore wind turbine under the action of extreme typhoon load or earthquake load. In addition, the method not only can be used for coupling analysis of the offshore wind turbine of a traditional steel supporting structure, but also is suitable for integrated coupling analysis of the wind turbine of a novel steel-concrete structure on land or on the sea.

The invention discloses a method for evaluating the stability of a river ecosystem based on the proportion of generalization species and specialized species. The invention relates to the technical field of river ecosystem stability evaluation, and solves the problem that an existing evaluation method is insufficient in sensitivity to dynamic response of river system stability. The method comprises the following steps: respectively setting sampling points at different river reaches according to actual conditions of a river, collecting benthic microorganism samples on gravels, sand and bottom mud of a target river reach, and measuring environmental indexes of each sampling point; performing high-throughput sequencing on benthic microorganism samples, and identifying generalization species and specialization species by combining the Levins ecological niche width; the method comprises the following steps: identifying and quantifying generalization species and specialized species of benthic microorganisms, determining a threshold relationship between the proportion of the generalization species and the specialized species and the river ecosystem stability, and constructing a river ecosystem stability evaluation system based on the proportion of the generalization species and the specialized species. The stability evaluation of the water ecosystem is realized; and the basin comprehensive management and the ecosystem construction are promoted.

The invention relates to a sea small target identification method based on polarization three-dimensional reconstruction, a computer and a ship, and belongs to the field of sea surface small target detection.The sea small target identification method comprises the following steps that S1, light intensity images of a sea surface detection scene in the four polarization directions of 0 degree, 45 degrees, 90 degrees and 135 degrees are collected through polarization imaging equipment, and polarization images are obtained; s2, calculating to obtain a linear polarization degree and a linear polarization angle based on the polarization image; s3, deducing the surface normal direction of the sea surface detection scene by adopting a lookup table method based on the linear polarization angle; s4, deducing the three-dimensional depth of the sea surface detection scene by using a shape polarization SfP technology according to the surface normal direction; s5, according to the three-dimensional depth, gradient values of the sea surface detection scene in the horizontal direction and the vertical direction are obtained through calculation; and S6, according to the gradient value, setting a threshold value of the gradient to distinguish the small target and the sea surface background in the sea surface detection scene, and completing the detection of the sea surface small target. The method is high in detection speed and high in precision.

The invention discloses a composite multi-frequency marine ultrasonic anti-fouling system and method, relates to the technical field of marine anti-fouling, and aims to change a single-frequency or simple-pulse ultrasonic transmitting mode, transmit composite multi-frequency ultrasonic waves in a wide frequency band, and superpose the ultrasonic waves of multiple frequencies in a transmission medium to generate a cavitation effect so as to achieve the anti-fouling effect. The method is used for avoiding the tolerance of marine organisms, improving the anti-adhesion efficiency and enhancing the effect of a specific area; the wave generating frequency and the working frequency are dynamically adjusted according to the running state and the environment condition of the ship, the energy consumption and the biological adhesion rate of the ship are reduced, and the relation among the biological adhesion rate, low energy consumption and the environment protection requirement is balanced.

The invention discloses an offshore wind power frequency conversion gathering and sending control method, device and system based on onshore integration, and belongs to the technical field of power transmission and distribution of power systems, and the method comprises the steps: converting first AC electric energy generated by an intermediate-frequency / power-frequency wind power plant into first DC electric energy through an offshore converter station; the first direct-current electric energy is transmitted to a land integration station through a direct-current submarine cable; second alternating-current electric energy generated by the low-frequency wind power plant is transmitted to the land integration station through a low-frequency alternating-current submarine cable; and converting the second alternating-current electric energy into second direct-current electric energy in the land integrated station, carrying out collection and power frequency conversion on the first direct-current electric energy and the second direct-current electric energy, and transmitting power frequency alternating-current electric energy obtained after conversion to a land power grid. Therefore, by implementing the application, the problem that the electric energy cannot be transmitted at low cost due to the fact that it is difficult to directly send the electric energy of different frequencies out of the system for topological combination in the prior art can be solved.

The invention discloses an offshore platform tide level data processing method, device and equipment and a storage medium, and relates to the technical field of signal processing. According to the scheme, standard time-frequency transformation and fast Fourier transformation are combined, periodic signals in signals can be completely recognized and extracted, the extraction precision of sea level data of an offshore platform is improved, and therefore reliable sea level data are obtained; and the de-noised tide data of various partial tides are obtained, so that the influence degree of different tides on the offshore platform can be analyzed.

The invention provides a multi-parameter-based offshore piling underwater sound source level prediction method and device.According to the method, multiple sets of historical monitoring data are obtained, each set of historical monitoring data comprises multi-parameter information and a corresponding single impact sound exposure level, and the multi-parameter information comprises impact energy, hammer weight, pile diameter and water depth; establishing a prediction relation model according to the multiple groups of historical monitoring data; and acquiring multi-parameter information corresponding to the single impact sound exposure level of the to-be-predicted project, and substituting the multi-parameter information into the prediction relation model to obtain the single impact sound exposure level of the to-be-predicted project, so that the impact energy, hammer weight, pile diameter and water depth of the to-be-predicted project, which are easy to acquire, are input, and the single impact sound exposure level of the to-be-predicted project is obtained. And the calculation is simple and convenient, so that the sound source level of the underwater noise generated by piling can be quickly predicted in the early stage of a project.

The invention discloses a seabed mineral and biological resource collection device, equipment and method. The device comprises a suction head, an automatic return mechanism, an automatic lifting mechanism and an environment sensing module, the suction head is used for sucking seabed to-be-collected objects; the automatic return mechanism is arranged in the suction head and consists of a main body frame, a torsional spring hinge, a limiter and a guide plate, and the guide plate can passively adjust the height away from the bottom according to the size of an object to be mined on the seabed through the matching of the torsional spring hinge and the limiter; the automatic lifting mechanism is located on one side of the suction head and comprises a carrying platform, a lifting module, a gravity balance swing arm and a posture sensing module, and the posture sensing module monitors the posture of the suction head and adjusts the lifting module, so that the suction head is kept horizontal and the height away from the bottom is preset; the environment sensing module can sense environment parameters in real time, accurately recognize physical characteristics of seabed to-be-collected objects and dynamically adjust the flow of a water pump to reduce overall energy consumption. According to the invention, double effects of efficient collection and energy-saving collection of submarine minerals and biological resources are realized.

The invention discloses a circulating water culture pond fish school biomass evaluation method, which comprises the following steps of: firstly, acquiring a sonar image corresponding to each circle of rotary scanning of a circulating water culture pond by sonar through steps S1 and S2, and extracting a spatial three-dimensional coordinate of each identified cultured fish in each sonar image based on image identification; filtering noise points generated due to repeated identification in the identified cultured fish coordinate points through the step S3, and counting the number of fish schools corresponding to each sonar image according to the actual cultured fish coordinate points obtained through point cloud merging, and then obtaining a linear correlation curve Si (hi) of the effective area Si of the pool wall and the sampling depth hi through the step S4, and finally, performing integration on the two curves according to intervals through the step S5, performing layered calculation on the number of the fish schools in each interval, and performing accumulation to obtain an estimated value P of the fish school biomass in the circulating water culture pond, so that the measurement accuracy of the fish school biomass in the circulating water culture pond can be improved.

The invention relates to the technical field of submarine cable engineering equipment, and discloses a submarine cable bending limiter failure analysis method and system, and the method comprises the steps: constructing a large-scale wave water tank experiment system; a wave flow test is carried out in a large-scale wave water tank experiment system, and three-dimensional terrain evolution data of a scouring pit formed at the single-pile foundation model and dynamic strain response and displacement of the submarine cable bending limiter model are obtained; constructing a hydrodynamic force-sediment transportation-submarine cable motion coupling numerical model according to the three-dimensional terrain evolution data, the dynamic strain response and the displacement; and according to the hydrodynamic force-sediment transportation-submarine cable motion coupling numerical model and different hydrodynamic force conditions, the quantitative relation between the scour range extension and the failure threshold value of the submarine cable bending limiter is determined. According to the scheme, the tensile stress and bending response change rule of the submarine cable and the bending limiter can be quantitatively analyzed, and reference is provided for optimal design and protection of the offshore wind power pile foundation submarine cable bending limiter.

The invention discloses a geometric constraint fitting point cloud filtering method for sea surface three-dimensional reconstruction, and belongs to the technical field of computer vision and three-dimensional reconstruction. The objective of the invention is to solve the problem of insufficient subsequent three-dimensional reconstruction precision caused by interference of reflection noise, mismatching points and the like in sea surface point cloud. The method specifically comprises the following seven steps: firstly, acquiring sea surface original point cloud through three-dimensional data acquisition equipment; a filtering technology is adopted to obtain a to-be-fitted point cloud; fitting a quadric surface through an improved RANSAC (Random Sample Consensus) algorithm to solve an initial parameter; constructing a comprehensive error function, and optimizing the model through gradient descent; effective inner points are screened through quadratic term coefficient constraint and a distance threshold value; and finally, iterating until a termination condition is met, and outputting an optimal effective point cloud. The method is high in noise rejection rate, the point cloud fits the sea surface form, and high-quality data support can be provided for sea surface fitting, sea wave simulation and unmanned ship control.

The invention relates to the technical field of monitoring, in particular to an ocean monitoring system and method based on big data mining, and the method comprises the steps: obtaining the traveling track and moving time data of a fishing boat generated by a positioning system arranged on the fishing boat; if it is judged that the staying time of the fishing boat in a certain area exceeds a preset threshold value based on the traveling track and the moving time data, marking the fishing boat as a suspicious boat, and collecting marine environment data corresponding to the area; when the suspicious ship is subsequently confirmed to be subjected to the fishing activity, generating a fishing data set according to the marine environment data collected in the corresponding period; a machine learning algorithm is adopted to train a marine monitoring point prediction model based on the fishing data set; and based on the marine environment data obtained through real-time monitoring, adopting a marine monitoring point prediction model to predict an excessive fishing risk area and generating early warning information. Early warning can be performed on the fishing position in the ocean according to the fishing data of the ship, so that a key area can be identified in advance, and the supervision efficiency is improved.

The invention discloses a single-point calculation method and system for single-point sampling of microbial population analysis and an inversion method.The method comprises the steps that a sampling device is controlled to sample multiple target intervals, and multiple parallel samples are collected after old water replacement in a pipeline is completed based on preset or instantly-calculated trigger interval time Tc; calculating the variety and population density of single-point microorganisms; and after uncertainty evaluation is carried out on the single points, integrating microorganism species and population density data of all sampling points in the target interval, and generating a microorganism species set and population density of the target interval. Therefore, the model breaks through the boundary effect limitation of the traditional laminar flow theory, so that the triggering interval time Tc is accurately calculated, and sample cross contamination caused by retention of old water particles is thoroughly eliminated. When the parallel sample deviates, the linear characteristic of low-fluctuation data is kept by adopting arithmetic mean; and the high-fluctuation scene is switched to the root-mean-square calculation mode, so that abnormal noise interference is effectively suppressed.

The invention discloses a visual drawing method and device for an inland ship navigation trajectory and a medium, and the method comprises the steps: collecting GPS positioning data, AIS dynamic parameters and static attribute data of a ship through a ship terminal, carrying out the preprocessing of the GPS positioning data and the AIS dynamic parameters, and storing the processed data in a database according to a timestamp index; calling a geocoding service interface, mapping the processed longitude and latitude coordinates of the ship to an electronic navigation channel chart coordinate system, and periodically updating a ship position mark in an electronic map interface; in response to a time period query instruction input by a user, extracting ship track point data corresponding to the timestamp sequence from the database, and superposing the ship track point data to the electronic channel chart to generate a dynamic track line; a user operation instruction is received through the time axis control, the ship mark position and the course display state on the trajectory line are dynamically adjusted, and visualized backtracking of the historical trajectory of the ship is achieved.

An ice fishing hole cover apparatus comprising a flange securable to a floor surface of a floor surrounding a floor hole with a sleeve extending from the flange into the floor hole and defining an aperture therethrough. A cover configured to biasingly magnetically engage the flange using several magnets and several corresponding metal elements disposed around the cover and around the flange respectively. The ice fishing hole cover apparatus may include an insert insertable into the sleeve in mechanical cooperation with the sleeve detent to extend the aperture to the ice fishing hole.