33 results about "Dam break" patented technology

The invention discloses a dynamic topology mapping and GPU heterogeneous flood coupling model real-time early warning method, and solves the problems of inflexible coupling of a one-dimensional model and a two-dimensional model, low calculation efficiency, poor dynamic response capability and the like in traditional flood simulation. A dynamic topology mapping mechanism is introduced to respond to emergencies such as dike burst and overflow in real time, the calculation efficiency is remarkably improved by utilizing a GPU heterogeneous parallel architecture, rapid and accurate simulation of the whole process of flood formation, evolution and submerging is achieved, reliable technical support is provided for flood control dispatching and emergency decision making, and the method is suitable for large-scale popularization and application. The method comprises the following steps: constructing a two-dimensional hydrodynamic model based on an unstructured grid, establishing a dynamic topology mapping mechanism and realizing GPU parallel numerical calculation; a two-dimensional model lateral connection coupling mechanism is constructed, dam overtopping flow is calculated in real time, and breach flow dynamic calculation of an improved DAMBRK method is carried out; multi-target parameter calibration, multi-dimensional model verification and one-two-dimensional model GPU collaborative parallel computing are realized.

The invention provides a three-dimensional lithium battery mine visualization system based on digital twinning, and the system comprises a physical sensing layer which is disposed at a lithium battery mine site, and comprises a plurality of sensor networks used for collecting geologic bodies, production equipment, environment parameters, personnel positions, and vehicle states; and the data interaction layer comprises a data integration platform and an edge computing node, and is used for carrying out cleaning, fusion, protocol conversion and edge side preliminary analysis on the multi-source heterogeneous data uploaded by the physical sensing layer, and uploading the multi-source heterogeneous data to a cloud. By integrating the slope monitoring sensor and the professional analysis model, real-time evaluation and advanced early warning of the slope stability and the tailing pond safety are achieved, major accidents such as collapse and dam break are effectively prevented, meanwhile, the harmful element diffusion model is utilized, and the safety of the tailing pond is improved. Migration paths of fluoride dust, radioactive substances and potential leakage pollutants in the atmosphere and the water system are dynamically simulated, accurate decision support is provided for environmental risk emergency response, and the influence on surrounding ecology is reduced to the maximum extent.

The application discloses a soil-rock dam reinforcing and enhancing structure for preventing over-standard overflow dam break and a construction method thereof. The structure comprises a soil-rock dam filling body, a vertical anti-seepage core wall arranged in the soil-rock dam filling body, and a composite high-strength fiber three-dimensional membrane arranged on the surface of the dam slope after regulation. The membrane body is unfolded along the slope surface and is reinforced by a pressing plate type fixing anchor bolt and a fiber membrane three-dimensional rivet. The row-to-row spacing of the fixing anchor bolt is 20-50 cm, so that the composite membrane is tightly attached to the dam body. The rigid structure and the flexible protection material are organically combined, the dam body's erosion resistance and durability are significantly improved while the flood discharge capacity is ensured, the construction method is simple, the cost is low, and the method is suitable for flood control reinforcement and safe operation of various soil-rock dams.

The invention discloses a dam break possibility prediction method. A target dam and an associated water area are divided into a plurality of evaluation areas based on a first preset rule; collecting earth surface displacement data and foundation permeability data for the dam part of each evaluation area, and synchronously collecting historical hydrological data and real-time hydrological data for the water area part of each evaluation area; fusing the earth surface displacement data and the foundation permeability data as physical elements of the assessment areas, fusing the historical hydrological data and the real-time hydrological data as hydrological elements of the assessment areas, performing multi-source coupling calculation on the physical elements and the hydrological elements, and outputting dynamic risk factors corresponding to the assessment areas; determining a globally unified target risk threshold value based on the structure limit parameters and the dam break case statistical characteristics; and searching the shortest risk conduction path meeting the critical slope constraint through a graph theory algorithm. According to the method, the risk conduction intensity of the adjacent areas is quantified by establishing the chain topology network, and the most easily-burst path is identified by combining the critical slope constraint.

The application relates to the field of mine geological modeling, in particular to a dynamic geological modeling method and system based on adaptive updating of multi-source heterogeneous data. The method comprises the following steps: acquiring tailing pond state feature data set, constructing a time-space lag prediction model through a machine learning method according to the tailing pond state feature data set; acquiring a tailing pond operation plan information set, predicting a pore water pressure change information set inside a tailing dam in a future period of time by using the time-space lag prediction model based on the tailing pond operation plan information set and a current ore pulp liquid level state; and performing dynamic evaluation of tailing dam stability according to the pore water pressure change information set and outputting stability early warning information. In the mine geological modeling process, timely allocation of emergency resources and accurate grasp of prevention and control time are realized, and chain instability of dam body and disastrous dam break accidents are reduced.

Embodiments of the present application disclose a reservoir over-standard flood inundation risk zoning method, device and equipment, by determining the reservoir siltation influence probability factor and the reservoir dam break influence probability factor under the siltation condition, the reservoir siltation influence probability factor and the reservoir dam break influence probability factor are used to calibrate the reservoir inundation comprehensive risk degree of siltation-dam break double influence probability under the over-standard flood condition, and the K-means clustering algorithm is used to cluster and analyze the reservoir inundation comprehensive risk degree of each grid calculation unit, and finally the flood risk grade is determined. The technical problem of low accuracy of prediction and zoning of flood inundation risk in the prior art for the reservoir area with high sediment concentration and weak dredging capacity is solved, and a scientific basis and certain technical support are provided for reservoir flood inundation risk assessment and disaster prevention and mitigation planning in high sediment concentration basin areas.

The invention discloses a rule and case dual-driven dam overtopping and dam break emergency evacuation decision knowledge recommendation method and system. The method comprises the following steps: constructing a heterogeneous domain knowledge graph including flood prevention regulations, emergency plan rules and historical dam overtopping and dam break disaster cases; acquiring real-time water and rain condition time sequence data and a disaster-affected area risk grid image generated by calculation of a hydrodynamic model, and generating a digital instance of a current disaster scene in combination with static engineering parameters input by a user; inputting the digital instance into a rule reasoning track and a case reasoning track at the same time for reasoning to obtain a double-track reasoning result; performing fusion judgment on double-track reasoning results, and outputting a forced evacuation instruction or generating a suggestion scheme based on a constructed game income matrix; generating a comprehensive decision report containing personnel transfer suggestions, regulation basis and similar case reference based on the result of fusion judgment; according to the invention, the accuracy and effectiveness of case recommendation are improved, and the reliability of the system under extreme disasters is improved.

The invention relates to a river levee dam break flood prediction method and device, and belongs to the technical field of flood prediction, and the method comprises the steps: predicting the future boundary data of a river channel through employing a historical rainfall-river channel boundary fitting algorithm according to the forecast rainfall of a weather bureau, and carrying out the prediction of the river levee dam break flood based on the future boundary data of the river channel and a one-dimensional hydrodynamic coupling mathematical model; predicting a future river section water level and a future river section flow; based on the future river section water level and the future river section flow, determining the water depth and the flow velocity of a coupling interface by combining a discontinuous interface algorithm; the water depth and the flow velocity of the coupling interface are used as boundary conditions to act on the two-dimensional hydrodynamic coupling mathematical model, and a momentum flux correction method is combined to predict the future ground flood level, so that the problems of unbalanced still water and unstable prediction during flood level prediction are solved, and the flood level prediction accuracy is improved.

The invention relates to the technical field of tailing pond infiltration line detection, and particularly discloses a direct-reading visual artificial intelligence detection device for a tailing pond infiltration line, two sides of a top plate are rotatably connected with supporting parts, the side surface of the top plate is fixedly connected with a gradienter, and the bottom of the top plate is fixedly connected with a blocking part. According to the direct-reading visual artificial intelligence detection device for the tailing pond infiltration line, the detection mechanism is arranged, the detection piece is lowered through the infiltration line detection pipe and can buzz after making contact with the water surface, and after receiving an alarm, detection personnel detect the situation through the video detection piece and directly read infiltration line burial depth data according to a scale cable; the accuracy of manual detection data of the tailing dam infiltration line is ensured, accurate comparison and analysis of online monitoring data of the infiltration line are facilitated, effective and accurate operation of an online monitoring device of the infiltration line is ensured, the stability of a dam body is kept, and dam break accidents are completely eradicated.

The application provides a tailing pond seepage sensitivity analysis and dam break early warning method based on fissure characteristics, acquires collection images of a tailing pond dam body based on a computer vision technology, analyzes and processes the collection images, determines joint fissure regions and joint fissure characteristics, realizes accurate acquisition of tailing pond joint fissure characteristics, provides accurate data basis for tailing pond seepage sensitivity, determines the saturation surface distribution and the hydraulic gradient distribution of the tailing pond dam body based on the joint fissure regions and the joint fissure characteristics, performs seepage sensitivity analysis and calculation on the tailing pond dam body, obtains seepage calculation results, performs dam break judgment on each type of result based on standard results, performs early warning and reminding according to the dam break judgment, realizes accurate analysis and early warning of the stability of the tailing pond, and ensures the safety of the tailing pond.

The invention provides a tailing pond emergency supervision Internet of Things large model system and method. The system comprises an emergency supervision and management platform, and the emergency supervision and management platform is configured to determine a plurality of local strain data of the tailings pond based on optical fiber signals obtained through distributed optical fibers and spatial resolution of the distributed optical fibers; determining the rainfall response amount of the tailing pond based on water level information acquired by a sensor arranged in the tailing pond; based on the multiple local strain data, determining tailing stability data at the current moment and the future moment; determining a target time point and an excretion parameter corresponding to the target time point based on the rainfall response amount and the tailing stability data; and based on the drainage parameters, the multiple drainage wells are controlled to open drainage valves at the target time point for drainage. Through the system, the drainage parameters of the drainage well in the tailing pond can be reasonably determined and controlled, the risks of dam break and landslide of the tailing pond are reduced, and the safety of downstream urban residents is guaranteed.

The invention belongs to the technical field of water conservancy projects, and discloses an earth and rockfill dam protection system and a protection method thereof. The earth and rockfill dam protection system comprises a roof protection structure, a protection structure and an energy dissipation structure, the roof protection structure is arranged at the top of the earth and rockfill dam, and the two ends of the roof protection structure extend by a preset length along the slope surfaces of the two sides in the thickness direction of the earth and rockfill dam. The protection structure is located on the slope surface of the downstream slope, the head end of the protection structure is spliced with the end of the roof protection structure, and the tail end extends to the dam foot of the earth and rockfill dam. The protection structure comprises a supporting layer, a drainage layer and a reinforcing layer which are sequentially stacked. The side, deviating from the drainage layer, of the supporting layer is stacked on the slope face of the downstream slope, the drainage layer is provided with permeation gaps, and the reinforcing layer can reinforce the structural strength of the earth and rockfill dam body. The energy dissipation structure is arranged at the dam foot of the earth and rockfill dam and spliced with the tail end of the protection structure. By arranging the protection system on the earth and rockfill dam, the dam body can be fully reinforced, the seepage line of the dam body is prevented from rising, the anti-scouring stability of the dam body is guaranteed, and the dam body is prevented from collapsing and breaking.

The utility model belongs to the technical field of flood control dam frameworks, and particularly relates to a framework structure for reinforcing a flood control dam, which comprises the flood control dam, a hard foundation and a plurality of slope beams, the slope beams are arranged on one side of an upstream face of the flood control dam, and two ends of each slope beam are respectively fixed on the top of an upper ground pile and the top of a lower ground pile. The bottom ends of the upper ground piles and the bottom ends of the lower ground piles penetrate through the flood control dam and extend into the hard foundation, the lower ground piles are located below the upper ground piles, one set of stainless steel cable inhaul cables are arranged between every two adjacent slope beams, and the two ends of one set of stainless steel cable inhaul cables are connected with the two slope beams through inhaul cable fixing buckles correspondingly. The steel pipe clamping sleeve is fixed to one set of stainless steel cable inhaul cables and used for laying a plurality of steel pipes, the steel pipe clamping sleeve is of a preset framework structure and serves as a support of flood control equipment, the situation that a flood control dam is further eroded by local dangerous cases such as leakage and piping can be prevented, water pressure of the dam is dispersed through the ground piles, and the situation that the dangerous cases expand and consequently the dam breaks is avoided; and further flood prevention and emergency rescue measures can be conveniently implemented.

The invention discloses a technical method for quickly evaluating the dam break submerging risk of a silt dam, which comprises the following steps of: extracting a dam control drainage basin area, a dam crest elevation and a current water level-reservoir capacity curve of the silt dam according to a current topographic map, and determining the position of a downstream residential area of the silt dam; determining the amount of water contained in the reservoir area during dam break of the silt dam, the corresponding frequency of dam break of the silt dam and the water depth in front of the dam before dam break; according to the dam front water depth before dam break, the maximum flow at the dam site during dam break is calculated; calculating the maximum flow of the residential area; calculating the submerging water level h1 of the residential area; calculating the submerging water depth of the residential area according to the submerging water level of the residential area; and calculating the submerging risk degree of the downstream residential area caused by dam break. According to the method, the judgment efficiency of the outburst risk of the silt dam under the extreme rainfall condition is improved, the required data is simple, the calculation method is simple and convenient, and the method is suitable for risk assessment of engineering facilities such as silt dams which are large in quantity and lack of engineering data.

The application discloses a green dam dismantling device and method, which comprises a pipeline, a hole sealing component, a pressurizing component and a power supply component. The pipeline comprises a pipe body, a conveying pipe, a wire and a filling material. The wire is provided with an electrode at the tail end. A hole is drilled on the dam body, and the pipeline is installed in the hole. The pressurizing component is connected with the hole through the conveying pipe, and fluid is injected into the hole through the conveying pipe, so that the dam body is cracked by the pressure of the fluid. The power supply component is connected with the electrode through the wire, and the power supply component supplies power to the electrode. The fluid flows into the cracks of the dam body, and the electrification of the fluid can accelerate the corrosion of the dam body, so that the dam body loses the cementation performance and the integrity of the dam body is damaged. The green dam dismantling device has the advantages of small dismantling risk, no need of dense hole distribution, no noise and dust pollution, and safety and high efficiency.

The invention provides a landslide surge impact pontoon disaster chain estimation method and system, and relates to the technical field of disaster chain estimation, and the method comprises the steps: carrying out the coordinate pairing of a digital elevation model (DEM) generated by a satellite remote sensing image and aerial survey data with geological drilling monitoring data, and obtaining the three-dimensional terrain information and rock-soil physical property parameters of a research area; multi-level numerical simulation is adopted in the links of surge propagation, flood inundation, structural impact and the like, a whole-process closed-loop monitoring and early warning system of landslide-surge-structural impact-dam fracture-downstream flood is formed, wave propagation is accurately solved by means of a Boussinesq equation, the dam bearing capacity is dynamically matched with outburst simulation, and the early warning accuracy is improved. And the Morison rule impact evaluation is carried out on a target structure such as a pontoon or a wharf, so that the downstream submerging range, the maximum impact force and the structure safety state can be obtained in real time and are intuitively presented in a risk level map layer form.

The application provides a kind of method and device suitable for the rapid evaluation of regional silt dam breaching disaster risk, relating to flood disaster warning technical field, comprising: building detection is carried out to digital orthographic image to obtain house outline data, and mapping model of light brightness inversion population is constructed based on night light remote sensing data, combined with house outline data and mapping model, hazard-bearing body data containing house location and population information is generated;Based on digital surface model, the main discharge path is determined, the flood buffer corridor is established along the main discharge path, and the flood influence area is determined based on the elevation difference of each topographic point in the flood buffer corridor relative to the main discharge path;The breaching disaster risk assessment information of the target silt dam is determined.The method and device provided by the application realize the automatic and rapid completion of the breaching risk screening work of a large number of silt dams in the regional scale;Significantly improve the evaluation efficiency and coverage, reduce the evaluation cost.

The application provides a dam-break flood simulation method and device, wherein the method comprises the following steps: obtaining the elevation of the reservoir water level of the dam and other parameters, calculating a breach flow evolution curve and other curves, and converting point source data into surface source data; obtaining the calculation result of the flood simulation; sequentially calculating the physical quantity of each node in stages, using different time steps in each stage, changing the calculation parameters when entering the next stage, and updating the terrain data; using time series alignment technology to align the initial scale representative flow value output by the dam-break parameter model; calculating the river flow of the river in the dam-break area; obtaining a reservoir capacity-sediment coupling model according to the sediment mass conservation equation, and predicting the dam-break of the to-be-predicted area, so that the time series alignment technology effectively guarantees the cross-scale data transmission accuracy and makes up for the limitation that the traditional calculation model cannot simulate short-term breaches and short-term river scouring.

Disclosed are method and a numerical three-dimensional dam breach model that calculate the dam break hydrograph for a homogeneous or zoned soil dam along with the visualized three-dimensional dam-breaching process and removed soil graph, wherein the failure mode can be overtopping failure, wind-generated wave overtopping failure, piping failure, or static liquefaction failure; wherein the dam can be breached at one location or multiple locations; and wherein elevations of the dam's crests and bottoms and soil properties at all stations along the dam's centerline are modeled. The topographic information surrounding the dam is pulled out from USGS DEM as a domain of the outer two-dimensional Shallow Water Equations grids that controls the hydraulic boundary conditions. Clear water scouring to different soils with different construction compaction efforts are calculated using corresponding erosion formulae. Force / moment equilibrium of soil blocks is analyzed, and instable soil blocks are removed.

The invention belongs to the technical field of safety monitoring and disaster prevention and control of a thermal power plant ash storage yard, and relates to a thermal power plant ash storage yard initial dam break influence length prediction method and system. Comprising the following steps that multi-source data of an initial dam of the ash storage yard are obtained, and the multi-source data comprise the maximum water depth after dam body outburst, the average slope of a downstream valley and the total length of the downstream valley; on the basis of the multi-source data, the debris flow rate after dam break is obtained through calculation; on the basis of the debris flow after dam break and the average slope of the downstream valley, the dam break influence length is obtained through calculation; and comparing the dam break influence length with a preset safety distance, and issuing graded early warning information according to a comparison result. According to the method, the dam break debris flow calculation model coupling the terrain and the fluid characteristics is constructed, and the influence length is accurately deduced based on the model, so that prediction deviation caused by parameter staticization and poor formula applicability of a traditional method is effectively overcome.

The application discloses a kind of based on optical remote sensing image's dam break accident fast change area detection method, belong to remote sensing image processing technical field.The method obtains the optical remote sensing image before accident and the optical remote sensing image after accident of dam break accident, and is converted to LAB color space;The absolute difference of three color channels in two LAB images is calculated respectively, and the absolute difference graph is obtained;For the three color channel data of each pixel in absolute difference graph, weighted summation is carried out, and the comprehensive color difference intensity value is obtained, and then the change intensity graph is obtained;Wherein, the weight of color elements A and B used in weighted summation is greater than the weight of brightness element L;Dam break accident change area is identified based on change intensity graph.Using the present application can improve the real-time performance, accuracy and robustness of dam break accident.

The application discloses a simulation experiment device for tailing pond instability dam break under continuous rainstorm conditions, which comprises a water supply device, a rainfall device, a rainwater recovery device, a reservoir area simulation device, a downstream terrain simulation device and a monitoring device. The rainfall device and the rainwater recovery device are connected with the reservoir area simulation device to realize the simulation of spatial and temporal distribution unevenness of reservoir area rainfall and the estimation of rainfall. The reservoir area simulation device is connected with the downstream terrain simulation device to realize the simulation of gap increase caused by rainwater scouring fine particles and the simulation of the influence of tailing pond dam break on the downstream under different height differences and terrain conditions. The monitoring device realizes image and data recording in the whole process of dam break. The application can flexibly simulate different degrees of natural rainfall at different positions above the tailing pond model, mix salt with tailing particles and simulate different terrains and landforms in the downstream, ensures the rationality of rainwater seepage process, improves the reliability of the test, and reduces the cost and operation difficulty of the downstream terrain simulation of the tailing pond.

The application provides a tailing pond emergency supervision Internet of Things large model system and method; the system comprises an emergency supervision management platform, the emergency supervision management platform is configured to determine a plurality of local strain data of the tailing pond based on optical fiber signals acquired through distributed optical fibers and spatial resolution of the distributed optical fibers; determine rainfall response of the tailing pond based on water level information acquired through sensors arranged in the tailing pond; determine tailing stability data at the current time and the future time based on the plurality of local strain data; determine a target time point and corresponding drainage parameters of the target time point based on the rainfall response and the tailing stability data; control a plurality of drainage wells to open drainage valves for drainage at the target time point based on the drainage parameters. Through the system, the drainage parameters of the drainage wells in the tailing pond can be reasonably determined and controlled, the risk of dam break and landslide of the tailing pond is reduced, and the safety of downstream city residents is ensured.

The application discloses a numerical simulation method for sediment entrainment and flow state conversion in cascade dam-break, comprising the following steps: constructing a multi-stage dam model; determining dam soil parameters; determining channel parameters and hydraulic parameters; initializing a calculation domain and setting initial conditions; establishing a numerical model; establishing an erosion model; establishing a collapse model; sediment entrainment; real-time updating of mixed fluid density; triggering and transmission of multi-stage dam cascade break. The application aims at the technical defects that the existing single dam break numerical simulation method cannot depict the actual cascade dam break process in mountainous areas. By constructing a multi-stage dam coupling model, combining the water-soil multiphase flow dynamics mechanism and the cascade triggering logic, the whole process simulation from the upstream first dam break, overflow propagation, downstream dam body triggering in turn to the final debris flow formation of the dam group is realized.

The invention belongs to the technical field of hydraulic engineering, discloses a breach position self-adaptive plain reservoir dam break simulation method, and aims to solve the problems of low modeling efficiency, large personal error, poor model reusability and the like when a conventional dam break simulation method is used for solving the uncertainty of a plain reservoir breach position. According to the method, through a mechanism of'predefined adaptive boundary + automatic matching ', the breach position and grid dissection decoupling and single scene switching are shortened to a minute level, manual operation errors are eliminated, breach simulation at any position of the box dam is supported, the efficiency, reliability and flexibility of plain reservoir dam break risk analysis are greatly improved, and the method is suitable for large-scale popularization and application. And powerful technical support is provided for flood control and disaster reduction emergency decision making.

The application discloses a river channel breach simulation method based on a two-dimensional coupling water power model, and specifically comprises the following steps: obtaining basic data of a calculation region, establishing a one-dimensional river network model and a two-dimensional surface water power model; coupling the one-dimensional river network model and the two-dimensional surface water power model to obtain a two-dimensional coupling water power model, solving the model, and calculating exchange flow; solving a model breach process, calculating a river channel breach flow process; coupling the breach flow into the model to calculate a breach flood evolution; updating section water depth, flow process, grid water depth and flow velocity in the model; outputting information; repeating until a preset simulation time length is reached, and completing simulation calculation. The method solves the problems of inaccurate calculation of a breach process caused by river flood and complex breach setting, is an effective method for calculating a river flood breach process, and has a clear process and simple operation.

The invention provides a method and device for simulating flood after dam break of a barrier dam, and the method comprises the steps: obtaining parameters such as elevation of reservoir water level of the barrier dam, calculating curves such as breach flow evolution curve, and converting point source data into surface source data; calculating to obtain a flood simulation calculation result; the physical quantity of each node is calculated in stages in sequence, different time steps are adopted in each stage, calculation parameters are changed when entering the next stage, and meanwhile topographic data are updated; performing time sequence alignment on the initial scale representative flow value output by the dam break parameter model by using a time sequence alignment technology; calculating the river flow of the river in the dam break area; the reservoir capacity-sediment coupling model is calculated according to the sediment mass conservation equation, dam break prediction is conducted on the to-be-predicted area, the cross-scale data transmission precision is effectively guaranteed through the time sequence alignment technology, and the limitation that a traditional calculation model cannot simulate short-term breach and short-term river scouring is made up.

The invention discloses a glacier lake dam break monitoring and early warning method based on distributed optical fiber sensing. The method comprises the following steps: deploying an optical fiber sensing network and acquiring data; data processing and abnormal event feature extraction; performing multi-parameter fusion analysis and dam break precursor identification; according to the system, optical fiber sensing networks are comprehensively deployed at different monitoring positions of the surface of the dam body, the interior of the ice dam, the side slope of the dam body and the glacier lake bottom, and physical quantity data of strain, temperature and vibration of the glacier lake and surrounding rock-soil bodies are comprehensively and stereoscopically monitored through a distributed optical fiber sensing technology; according to the dam break early warning system and method, comprehensive collection of full-distributed and multi-parameter original monitoring data is achieved, real-time monitoring and prediction of the dam break risk are achieved in combination with recognition of a dam break precursor sequence and multi-level early warning, early warning information can be efficiently and accurately transmitted to decision-making departments and affected people, and emergency response can be triggered earlier and more accurately.

The application relates to an underwater air film drag-reducing projectile, a ground drilling anchor and a dam breaking and repairing device. The underwater air film drag-reducing projectile comprises a projectile shell and a switch, the projectile shell is internally provided with a gas supply chamber, the projectile shell is provided with an air film forming hole enabling the gas supply chamber to communicate with the outside, the gas supply chamber is internally provided with a gas supply assembly capable of generating a jet gas flow, and the switch is connected with the gas supply assembly to control the gas supply assembly to spray gas outward through the air film forming hole after entering water to form an air film outside the projectile shell. The jet gas flow can form an air film adhering to the surface of the projectile shell during movement, greatly reducing the resistance generated by the direct contact between water and the projectile shell, reserving a large amount of kinetic energy for subsequent penetration into the soil, and solving the problem that in the prior art, kinetic energy is excessively consumed in water, and the final ground drilling depth is insufficient.

The invention discloses a method for discriminating an urban reservoir with a downstream impact risk, and the method comprises the steps: recognizing the urban reservoir according to a geographic position, a dam break flood impact risk and reservoir function benefits; according to the distance between the reservoir and the city and the dam break information of the reservoir dam crest length, the reservoir capacity and the characteristic water level, the flood peak flow of dam break flood routing to the city is calculated; and comparing the flood peak flow of the dam break flood routing to the city with the flood discharge capacity of the backbone riverway of the built-up area, and when the flood peak flow is greater than the flood discharge capacity of the riverway, indicating that the reservoir break generates impact on the built-up area, and judging that the reservoir is an urban reservoir outside the built-up area. Aiming at the problems that a high-risk urban reservoir is unknown in concept definition and different in judgment standard, the urban reservoir judgment method is provided by analyzing the geographic position and risk influence of the reservoir, and a basis is provided for risk prevention and control of a reservoir dam.