14 results about "Surficial sediments" patented technology

The invention discloses a wetland nitrogen cycle optimization method and system based on machine learning, and belongs to the technical field of ecological engineering.The method comprises the steps that according to a comprehensive environment data set, a transverse lateral infiltration path and a vertical priority flow path are recognized, spatio-temporal evolution simulation is conducted through a cellular automaton model, and a nitrogen migration path is constructed; analyzing the interaction between the water flow driving flux and the underground water level on the path resistance, and determining the broadening degree of the transverse lateral seepage path; if the widening degree exceeds a preset threshold value, integrating the water body turbulence intensity data and the flow velocity shear effect value, and obtaining a bubble escape rate and a surface sediment disturbance frequency; calculating the nitrogen saturation and the spatial distribution of the sediment particle suspension amount, and obtaining the total re-release flux through flux overlay analysis; and constructing a nitrogen loss flux model in combination with the fluctuation rule, simulating the change of the nitrogen loss proportion, and determining the net nitrogen loss flux. According to the invention, fine monitoring of the dynamic change of wetland nitrogen can be realized.

The present application relates to the technical field of seabed sediment collection, and discloses a seabed surface layer sediment layered collection device, wherein the collection cylinder is composed of multiple segments in a splicing mode, and the inside of the collection cylinder is provided with multiple layered intercepting boxes. The collection cylinder is composed of multiple segments in a splicing mode, so that the collection depth of the collection cylinder can be adjusted according to actual needs. The splicing ring seat, limiting groove and limiting bolt are used to facilitate the quick combination and connection between multiple collection cylinders, so that the connection is stable, and the subsequent quick taking of samples is facilitated. By adjusting the length of the single-segment collection cylinder, the requirements of different sampling layer spacings in layered sampling can be met, so that the flexible application conditions are met. By arranging multiple layered intercepting boxes in the collection cylinder, the internal space of the collection cylinder is divided into multiple groups of collection cavities, so that the samples with different layer spacings can be stored separately in layers during layered sampling.

The application discloses a kind of multi-point mobile deep-sea sampling drill chassis wheel train coupling dynamics simulation methods, comprising the following steps: 1) establish multi-point mobile deep-sea sampling drill three-dimensional model and import RecurDyn multi-body dynamics analysis software to carry out entity replacement;2) add the constraint and initial stress between each component, such as fixed pair, moving pair, rotary pair;3) add the contact between chassis and guide wheel, supporting wheel, tug, transmission wheel and track, and mesh division is carried out on the wheel train part of hydraulic chassis in the software, and flexible treatment is carried out, and the soil parameters simulating surface sediment at 6000m in deep sea and the hydrodynamic force received by drill are added;4) finally, the rigid-flexible coupling dynamics simulation of multi-point mobile deep-sea sampling drill chassis wheel train is carried out, and the impact result received by chassis wheel train is observed after simulation, which provides theoretical basis and data support for the safe release of multi-point mobile deep-sea sampling drill.

The invention discloses a shallow lake multilayer environment DNA and surface sediment combined sampling method. The method comprises the following steps: S1, acquiring basic geographic information and water physical and chemical parameters of a lake; s2, on the basis of the environment data obtained in the S1, lake layout candidate sampling points are divided; s3, carrying out cleaning treatment on the sampling device; s4, respectively collecting water samples of different water layers of the lake; s5, collecting a lake surface sediment sample, and sealing and storing the lake surface sediment sample and the water sample collected in S4 in different chambers; s6, marking the sealed water sample and sediment sample; and S7, synchronously recording environment parameters and operation logs of the whole sampling process. Compared with the prior art, the shallow lake multilayer environment DNA and surface sediment combined sampling device and the sampling method thereof have the advantages that high-quality combined acquisition of a water body vertical section and a sediment interface eDNA sample is realized, and a reliable sample basis is provided for accurate monitoring of a lake ecosystem.

The invention discloses a method and a system for determining heavy metal pollution characteristics of water sediment, and relates to the technical field of environment monitoring and water environment governance, the system is characterized in that surface sediment samples are regularly collected at different positions of water in a mine area and an industrial gathering area, and a metal element data set and a reference data set are established; calculating a single-factor pollution index, and judging whether single metal exceeds the standard or not; integrating the single-factor pollution indexes to obtain a comprehensive pollution index, and determining the overall pollution level; whether manual input pollution exists or not is judged by calculating the geocumulative index; according to the method, correlation analysis, principal component analysis, factor analysis and GIS space statistics are combined, multi-dimensional indexes are extracted, pollution source analysis coefficients are calculated, agricultural non-point source or industrial emission dominant pollution types are determined, and corresponding prevention and control strategies are generated. According to the method, multilevel feature recognition and source analysis of sediment heavy metal pollution can be realized, and a scientific basis is provided for water area pollution treatment and risk management and control.

The invention discloses a seabed modified gel injection vehicle for deep-sea mining and a using method, and relates to the technical field of deep-sea resource development, the seabed modified gel injection vehicle comprises a vehicle body, a walking chassis, a gel injection mechanism and a driving mechanism, the vehicle body is provided with a gel storage cabin, and the gel storage cabin is used for storing a gel material; the walking chassis is arranged at the bottom of the vehicle body and used for supporting the vehicle body to walk on the seabed. The gel injection mechanism is mounted on the vehicle body, is communicated with the gel storage cabin and is used for injecting a gel material into sediment on the surface layer of the seabed; the driving mechanism is in transmission connection with the gel injection mechanism and used for driving the gel injection mechanism to execute injection action, plume generation is effectively inhibited, the overall efficiency of deep-sea mining is improved, and the marine ecological environment is protected.

This invention relates to the field of aquatic environmental ecological risk assessment and pollution control technology, and specifically discloses a method for assessing the risk of heavy metal release from sediments and constructing quality benchmarks based on phase equilibrium partitioning and DGT technology. The method includes the following steps: S1, Sample collection and pretreatment: Sampling points are set up in the target water area, and surface sediment samples are collected using a mud grabber. Simultaneously, a columnar sampler is used to collect undisturbed columnar sediment samples for deploying the DGT device; S2, Obtaining dynamic information on heavy metals at the sediment-water interface; S3, Calculation and relationship establishment of key parameters: a. Calculating the solid phase recharge coefficient R of heavy metals in the sediment: R = C_DGT / C_Peeper. This method for assessing the risk of heavy metal release from sediments and constructing quality benchmarks based on phase equilibrium partitioning and DGT technology can obtain dynamic flux and bioavailability information of heavy metals at the sediment-water interface in situ and at a microscale, avoiding the disturbances and low spatial resolution of traditional sampling methods.

This application belongs to the field of marine geology, specifically disclosing an inversion method and application for seafloor sedimentation rate and stratigraphic porosity distribution. The method includes: obtaining the possible distribution range of stratigraphic porosity *n* with depth *z* within the proposed study area; obtaining the porosity of surface sediment samples; based on the distribution range and the porosity of the surface sediments, assuming *m* possible stratigraphic porosity variations with depth at the proposed study location; and for each assumed stratigraphic porosity variation with depth, calculating the corresponding average mass sedimentation rate *R*. si Then, the deposition rate R is simulated in numerical software. si The porosity distribution of the seafloor strata below; will be shown in each R si The simulated formation porosity distribution with depth is compared with the corresponding assumed distribution under the given conditions. If they match, the simulated formation porosity distribution with depth is the actual formation porosity distribution at that location. This application is low-cost, convenient, quick, and easy to promote.

This invention relates to the field of deep-sea sampling technology, specifically to an in-situ, high-fidelity sampling device and method for shallow seabed sediments. The device includes a sampling cylinder with a sampling chamber at its lower end. A ball groove is formed through the lower end of the sampling chamber, and a ball valve is located inside the ball groove. A rotating shaft is fixedly connected to both ends of the ball valve, and a bevel gear is fixedly connected to one end of the rotating shaft. A motor is located on the inner edge of the sampling cylinder, and a bevel gear meshing with the bevel gear is fixedly connected to the output shaft of the motor. A pressure-reducing assembly is located at the upper end of the sampling cylinder. The pressure-reducing assembly includes a pressure-reducing cavity located at the upper end of the sampling cylinder, with multiple bladder walls inside the pressure-reducing cavity. A ball groove is formed at the lower end of the pressure-reducing cavity, and a ball valve is located within the ball groove. This invention stabilizes the in-situ pressure in the sampling chamber, preventing structural damage to the sample due to sudden pressure changes, and achieving in-situ high-fidelity sediment sampling.

This invention relates to the field of marine mineral resource exploration and evaluation technology, specifically to a method for identifying shallow-surface zircon resource potential areas in marine areas based on zircon grade data simulation analysis. The method includes the following steps: S1: Collecting shallow-surface sediment samples from the seabed to obtain zircon grade and marine environmental parameters; S2: Constructing a multivariate regression model of zircon grade and environmental factors; S3: Establishing a spatial probability distribution model of zircon grade; S4: Establishing an index fusion system and evaluating the resource potential value of each region; S5: Iteratively optimizing the potential area classification threshold and correcting parameters; S6: Generating a potential distribution heatmap and outputting the boundary coordinates of high-potential areas and a resource estimation report. This invention, by constructing a discrimination system integrating data modeling, uncertainty quantification, and visualization delineation, achieves high-precision identification and quantitative assessment of shallow-surface zircon resource potential areas in marine areas.

The invention provides an in-situ quantitative evaporation capacity monitoring device which comprises an evaporation container, a water storage container, a water body storage bag and a connecting pipe, the evaporation container is embedded underground, and the top of the evaporation container is flush with the ground surface; the water storage container is embedded underground, and a plurality of fine holes are formed in the water storage container; the fine holes penetrate through the container wall of the water storage container; the water body storage bag is arranged in the water storage container; one end of the connecting pipe is communicated with the evaporation container, and the other end of the connecting pipe penetrates through the water storage container and is communicated with the water body storage bag. In the application, the water body storage bag is communicated with the evaporation container through the connecting pipe, and the water body storage bag is completely submerged in the water storage container, so that the evaporation process in a natural state can be effectively simulated, and the evaporation capacity of the surface layer loose sediment underground water can be obtained by calculating the reduction of the water volume in the water body storage bag; and a plurality of pores are distributed on the water storage container, so that pore water in the water storage container is kept horizontal with external surface sediments all the time, and the monitoring precision and reliability are improved.

The application discloses a net cage fish culture environment carrying capacity evaluation method and system based on sedimentation flux, and relates to the technical field of culture environment regulation and control. The method comprises a culture fish population biomass model, a relationship model between the sedimentation flux of the biological sediment in the net cage culture area and the culture fish population biomass, and an organic matter and inorganic matter decay model in the surface sediment. The method selects the organic carbon content in the surface sediment of the seabed as an environmental index, and according to the threshold value of the organic carbon content in the surface sediment, the stocking quantity of the culture fish capable of making the organic carbon content in the surface sediment reach the threshold value at the end of the culture period is predicted as the environmental carrying capacity of the net cage culture. The application can provide a direct basis for the production decision of the net cage fish culture, maintain a good water environment, and realize the sustainable development of the net cage culture industry.

The embodiment of the invention provides an in-situ collection device for surface sediments and overlying water and a collection method of the in-situ collection device. Wherein the in-situ collection device comprises a rotary rod supporting piece, a sediment collection unit and a covering water collection unit. The sediment collecting unit comprises a mud collecting barrel, the mud collecting barrel is connected to one end of the rotating rod supporting piece, and a mud inlet is formed in the side wall face of the mud collecting barrel; the overlying water collecting unit is slidably and detachably arranged on the rotating rod supporting piece in a penetrating and sleeving manner, and the overlying water collecting unit can abut against the mud collecting barrel. The sludge inlet is formed in the side wall of the sludge sampling barrel, so that sediments enter the sludge sampling barrel from the side direction under the condition that the surrounding environment is not disturbed, and interface disturbance caused by vertical insertion is effectively avoided; the in-situ collection device for the surface sediment and the overlying water has the advantages of being high in in-situ sampling precision, small in environmental disturbance, capable of accurately obtaining layered samples and the like.

This application provides a method for early warning of polycyclic aromatic hydrocarbons (PAHs) in coking coal basins, relating to the field of environmental ecology technology. The invention includes the following steps: selecting first to third-level sub-basins along the main stream based on the topography of the coking coal basin, collecting water samples and surface sediments; determining the concentration and composition of PAHs, and qualitatively analyzing the pollution sources of PAHs through the ratio distribution between PAH isomers; selecting representative water and sediment samples for metagenomic sequencing to obtain information on the structure and functional genome composition of microbial communities; conducting ecological risk assessment of PAHs using the risk entropy method; and providing early warning of the ecological risk of PAHs in the coking coal basin. This invention organically couples the spatiotemporal distribution of PAHs, the ecological risk assessed by chemical methods, and the structural and functional responses of microbial communities to construct a spatial pollution identification system encompassing surface water, sediment, and land use information, which helps improve the ability to analyze coal-coke composite pollution.