776 results about "Silt" patented technology

The invention discloses a high-pressure jet grouting pile construction optimization control method and system, and belongs to the technical field of pile foundation construction. According to the method, the pile body strength is predicted based on the XGBoost regression model, the HSIO hybrid swarm intelligent optimization algorithm is combined with the artificial bee colony algorithm and the seathead optimization algorithm, the construction parameter combination is dynamically adjusted, and optimal matching of the target strength and the real-time construction state is achieved. The method solves the problems of parameter setting deviation and non-uniform pile forming quality caused by the fact that traditional construction depends on artificial experience, is particularly suitable for high-precision construction requirements under complex geological conditions (such as karst areas and deep and thick sludge layers), remarkably improves the pile body strength stability, construction efficiency and quality controllability, and reduces the construction cost. And meanwhile, material waste and personal error risks are reduced.

The invention relates to an integrated experimental system and method for simulating sand production-sand prevention of an argillaceous silt hydrate reservoir, and the system comprises a reservoir sand production / mechanical property evaluation simulation device which comprises a heat exchange chamber and a high-pressure reaction kettle arranged in the heat exchange chamber, and the high-pressure reaction kettle is internally provided with a core holder; the gas displacement and control device is connected with the reservoir sand production / mechanical property evaluation simulation device; the confining pressure loading device is connected with the high-permeability confining pressure layer in the reservoir sand production / mechanical property evaluation simulation device and is used for simulating the confining pressure environment outside the reservoir core sample; the liquid displacement and control device is connected with the high-pressure reaction kettle and is used for providing liquid displacement conditions for the reservoir core sample; the gas-liquid-solid separation device is connected with the high-pressure reaction kettle and is used for separating a gas-liquid-solid mixture; the visual sand prevention simulation device for the screen pipe unit comprises a visual acrylic pipe, and the data acquisition device is used for acquiring and processing data of the sand prevention experiment of the visual acrylic pipe.

The invention belongs to the technical field of vertical jacking of underwater shield tunnels, and particularly relates to a submarine hard rock shield tunnel nuclear power cold source drainage head construction method which comprises the following steps: reinforcing a sludge layer between seawater and a rock stratum; a pile casing is installed in the reinforcement treatment area of the sludge layer; bed rock in the pile casing is removed; the pile casing is backfilled with a sealing material; performing protection treatment on the outer side area of the pile casing; and shield tunneling construction is conducted in the rock stratum, a tunnel is formed, and vertical jacking construction is conducted on the sealing material in the pile casing through the tunnel to form a drainage head. According to the method, the key technology related to subsea tunnel shield internal drainage head construction under the hard rock condition can be achieved; the problems of hard rock treatment and backfilling compaction at the vertical jacking part are solved, the treatment area is reduced to the maximum extent, the cost is saved, the construction progress is accelerated, the construction safety is guaranteed, normal tunneling of slurry balance shield tunneling is guaranteed, and meanwhile the requirement of vertical jacking for the stratum is met.

The invention provides an irrigation area sediment deposition prediction method and system, computer equipment and a storage medium, and belongs to the field of water conservancy project intellectualization, and the method comprises the steps: collecting historical hydrological data, real-time monitoring data and remote sensing observation data of a to-be-predicted irrigation area; the method comprises the following steps: resampling historical hydrological data and real-time monitoring data, carrying out forward filling completion on missing data, filling remote sensing observation data into a unified time axis, and filling missing spatial features based on spatial feature values of an adjacent time reference to obtain multi-source data with time-space alignment; extracting features of the multi-source data to obtain four features; and combining the four features and calculating correlation weights among the features so as to determine the sediment flow, the sediment concentration and the sediment flow velocity of the to-be-predicted irrigation area. According to the method, aiming at the defect of non-uniform spatial and temporal distribution among multi-source data sources, spatial and temporal alignment is realized through time re-adoption and spatial feature completion, the input information can accurately reflect the sediment transportation process of an irrigation area, and the prediction accuracy is improved.

The invention discloses a method for cooperatively carrying out dredging and ecological protection in a near-shore sensitive area, belongs to the technical field of port and channel engineering desilting, and aims to solve the technical problem that construction efficiency and ecological environment protection are difficult to consider when dredging operation is carried out in the near-shore sensitive area. Comprising an operation system of at least one dredging sub-ship, a path is planned through underwater topographic survey, the sub-ship is fixed through a gauge pile system, a multi-joint hinged arm with a cover type cutter suction head is lowered to be attached to a mud bed, sludge is liquefied through a high-pressure water system, and slurry is conveyed through a sand pump set; the slurry concentration and the turbidity of a surrounding water area are respectively monitored through an inner turbidity sensor and an outer turbidity sensor, and closed-loop feedback control is formed to dynamically adjust the power of a sand pump, the pressure of high-pressure water and the speed of a hinged arm; and meanwhile, in the dredging process, an ecological base material containing a biological agent is sprayed to the bare seabed through an ecological base material spray head, and dredging and ecological restoration are synchronously carried out. The method is mainly used for dredging construction and ecological protection of near-shore sensitive water areas.

This invention provides an in-situ stratified rapid sampling device and method for river and lake sediment pollution, relating to the field of river and lake sediment pollution monitoring technology. The device includes: a main control system, a main sampling system, a mounting frame, a depth sounding module, a working vessel hull, and a crane. The depth sounding module is installed below the stern of the working vessel hull. The main control system and the crane are both mounted on the working vessel hull. The main sampling system is connected to the crane and fixed within the mounting frame. The depth sounding module is used to detect and determine water depth and the thickness of floating mud, flowing mud, and silt. The main control system is used to control the sampling process of the main sampling system and to read the water depth, sediment thickness, and determine whether the main sampling system has completely inserted into the sediment in real time. The main sampling system is used to insert into the sediment to perform stratified sampling of the sediment pore solution. This invention solves the problems of low sampling rate, inability to perform stratified sampling, deviation between stratified sediment samples and actual conditions, low efficiency, and large errors in detection results in existing technologies.

The invention discloses a sediment collection and supply integrated device for offshore wind turbine pile foundation scour prevention, which is arranged around the periphery of an offshore wind turbine single pile foundation, relates to the technical field of offshore wind power engineering, and comprises an annular sand collection unit, a sand storage unit, a sand unloading unit and a sand supply guide unit which are communicated from top to bottom; the annular sand collecting unit guides sediment in ocean current to be deposited and collected, the sand storage unit receives and stores the collected sediment, and the sand unloading unit can seal a bottom outlet of the sand storage unit in an opening and closing mode; the sand supplementing guide unit directionally guides the discharged silt to the scouring pit; the mechanical triggering unit and the elastic resetting unit are used for opening and resetting the sand unloading unit. Sediment carried by ocean current is utilized, through pure mechanical passive operation, integrated self-circulation of collection, storage, triggering, release and supply of the sediment is achieved, external energy is not needed, the self-adaptive adjusting capacity is achieved, and the construction and operation and maintenance cost is remarkably reduced.

The invention relates to the technical field of quartz sand cleaning, and discloses a device for realizing a scrubbing treatment process of quartz sand for fracturing, which comprises a separation barrel, an inclined bottom plate, a driving motor, a silt storage barrel, a screening frame, a rotating shaft and the like, a feeding port is formed in the top of the separation barrel, an inclined bottom plate is fixedly connected into the separation barrel, a driving motor is installed at the top of the separation barrel, a silt storage barrel is fixedly connected to the bottom of the separation barrel, silt generated in the cleaning process falls downwards into the silt storage barrel, a screening frame is fixedly connected into the separation frame, and quartz mortar liquid is poured into the screening frame to be scrubbed and screened. According to the device, rotation of the rotary screen is matched with impact cleaning of external water flow, impurities falling from the surfaces of quartz sand particles can directly penetrate through the rotary screen along with water flow to flow into a sediment storage barrel at the bottom in the cleaning process, and the situation that the impurities such as sediment are adsorbed on the surfaces of quartz sand again can be effectively avoided; and quartz sand particles are classified by using fine sieve holes and a coarse material discharging frame during cleaning.

The present invention relates to the technical field of sediment or sludge treatment of a water body, and provides a solidification material and a use thereof. The solidification material consists of the following components in percentage by mass: 30% of a sediment flocculant, 20% of a high-strength and high-water-resistant earth consolidator, 30%-40% of calcium bentonite, 5%-15% of a clay mineral, and 5% of an engineering admixture. When the solidification material is used in the sediment or sludge treatment of the water body, pollutants in sediments can be well immobilized, and as tested, no leaching of the pollutants occurs after immersion in the water body. Moreover, the usage amount of the solidification material is significantly reduced compared to that of a conventional solidification material, so that the impact on the storage capacity of the water body can be effectively reduced, and the construction cost is also saved.

The invention discloses a sediment prediction method and system for oscillation period strategy snow ablation optimization, and the method comprises the steps: obtaining sediment data characteristics, enabling a drainage basin to comprise a plurality of nodes, and calculating the snow melting runoff of each node according to the sediment data characteristics; according to the snow melting runoff of each node, calculating the initial sand production concentration of each node; and constructing a sediment prediction model, inputting sediment characteristic data and corresponding actual sediment concentration to the sediment prediction model to obtain a trained sediment prediction model, inputting real-time sediment data to the trained sediment prediction model, and outputting predicted sediment concentration by the trained sediment prediction model. According to the method, historical sediment data are acquired, and a graph convolutional neural network is constructed for learning complex nonlinear mapping from snow melting-runoff generation to sediment transportation, so that the problems of weak generalization ability and strong data dependence of an existing snow melting period sediment prediction method are solved.

The invention discloses a night near-shore surface layer suspended sediment prediction method fusing a dynamic model and remote sensing, and relates to the technical field of night suspended sediment prediction, and the method comprises the following steps: obtaining a real-time blue-green ratio based on a real-time remote sensing image; acquiring a first type of historical data; obtaining an image prediction function based on the first type of historical data; acquiring the flow velocity of to-be-detected offshore seawater, and marking the flow velocity as a real-time flow velocity; acquiring a second type of historical data; obtaining a dynamic prediction function based on the second type of historical data; obtaining an image prediction concentration based on the real-time blue-green ratio and an image prediction function; obtaining a power prediction concentration based on the real-time flow velocity and a power prediction function; obtaining a final suspended sediment prediction concentration based on the image prediction concentration and the power prediction concentration; the method is used for solving the problem that the concentration of suspended sediment cannot be accurately obtained through remote sensing at night due to the fact that an appropriate suspended sediment prediction method cannot be set at night based on remote sensing in an existing suspended sediment prediction technology.

The invention relates to a construction method of an offshore sludge solidified soil-riprap mixed anti-scouring structure, the anti-scouring protection structure sequentially comprises a riprap layer, a high-fluidity strong-compactness flow state solidified soil layer and a low-fluidity high-strength flow state solidified soil layer from bottom to top, and the anti-scouring protection structure is formed by sequentially filling during construction; the riprap layer is poured into the scouring pit by a certain depth, the high-flowability and high-density flow state solidified soil is formed through self-leveling pouring based on the riprap layer, and the low-flowability and high-strength flow state solidified soil layer is formed through self-leveling pouring based on the high-flowability and high-density flow state solidified soil. According to the invention, the riprap layer is combined with the high-flowability strong-compactness flow-state solidified soil and the low-flowability high-strength flow-state solidified soil which are different in strength and anti-scouring performance, so that the problem of poor protection effect of the riprap protection layer caused by riprap pore scouring is avoided; and the high construction cost caused by full-pouring anti-scouring flow state solidified soil is also reduced.

The invention discloses an air pressure drainage dredger and a dredging method, the air pressure drainage dredger comprises a dredger body, the middle part of which is provided with a through hole; the dredging device is arranged at the through hole; the vertical movement mechanism is mounted on the ship body and used for driving the dredging device to move in the vertical direction; the desilting device comprises a mud taking part which comprises a drainage cover, a soil retaining plate and a mud taking mechanism; the drainage cover is of a columnar structure with a sealed top and an open lower part, and the mud taking mechanism is arranged in the drainage cover; the sludge conveying part is used for conveying the sludge excavated by the sludge taking part to the sludge discharging part; and the sludge discharging part is used for receiving and discharging the conveyed sludge. Dry excavation of lake and reservoir sludge is achieved through air pressure drainage, and the problems that existing dredging equipment is complex in aftertreatment process, large in energy consumption and large in pollution are solved.

The application provides a foundation pit supporting structure of deep silt stratum and a construction method thereof. The foundation pit supporting structure comprises cast-in-situ bored piles arranged in rows and a water stop curtain. The water stop curtain comprises a plurality of rotary jet piles located in the silt layer and the upper stratum thereof and a plurality of swing jet piles located in the lower stratum of the silt layer. The cast-in-situ bored piles are constructed by using rotary drilling machines; adjacent rotary jet piles are overlapped and engaged with each other; adjacent swing jet piles are overlapped and engaged with each other; and adjacent cast-in-situ bored piles are not engaged with each other. The application combines the construction of the water stop curtain and the cast-in-situ bored piles, firstly constructs the rotary jet piles of the water stop curtain, overlaps and engages the rotary jet piles with each other, then constructs the cast-in-situ bored piles by using rotary drilling machines in the rotary jet piles, the diameter of the rotary jet piles is larger than that of the cast-in-situ bored piles, the former serves as the water stop curtain and also serves as the temporary casing during the construction of the latter, one pile has two uses, the construction process is reduced, the engineering cost is lowered, and the application has good popularization value.

The utility model belongs to the technical field of retaining wall, disclose a water conservancy building retaining wall, including retaining wall, backfill and concrete bottom plate, the retaining wall inside is equipped with the water outlet pipe, backfill inside is equipped with the drainage blind ditch, drainage blind ditch inside is equipped with the filter structure, drainage blind ditch is connected with the water outlet pipe through the connecting structure, set up drainage blind ditch and water permeable geotextile when backfilling backfill, reduce the water level of backfill layer upper end to drainage blind ditch lower end, the water of upper end is through drainage blind ditch and flows to water permeable net pipe, the silt that enters water permeable net pipe is reduced through the filtration of blind ditch gravel and geotextile, again due to the water of inside flow of water permeable net pipe can take away trace silt, thereby avoid the deposition of silt and cause the blockage, the water in water permeable net pipe is taken away through the water outlet pipe that is preburied in retaining wall, thereby reduce the hydrostatic pressure of backfill to retaining wall.

The application discloses high-content Yellow River silt C50 high-performance concrete and a preparation method thereof, which comprises the following components in parts by mass: cement: 300-450 parts, fly ash: 50-100 parts, Yellow River silt: 50% of the total mass of fine aggregate, gravel: 1000-1200 parts, multi-component composite silicon reinforcing agent: 10-30 parts, special soil dispersant: 5-15 parts, and water: 140-180 parts. The dispersant and the reinforcing agent are deeply synergized in function, and the problems of dispersion and activity excitation of the Yellow River silt under high content are effectively solved. The formula can be adjusted according to the silt characteristics of different river sections, and the stability and industrial reproducibility of the concrete performance are significantly improved by combining with the twice stirring process. The technical scheme realizes high-content and high-value utilization of the Yellow River silt, meets the high-performance concrete standard, and achieves high unification of technical, environmental protection and economic benefits.

The embodiment of the application provides a reservoir capacity dynamic monitoring method and system based on a UAV, which comprises the following steps: obtaining a reservoir surface layer feature data set through a UAV, determining a water area boundary and scanning a reservoir bottom according to the data set, obtaining underwater topographic elevation and silt distribution data, and constructing a three-dimensional topographic model; determining topographic and silt change data based on dynamic change data of the three-dimensional topographic model of a continuous time sequence. Through change rate analysis, silt space distribution characteristics are obtained, and the amount of silt transport and the silt deposition space rule are determined in combination with water flow velocity. Key driving factors are screened through correlation analysis, a high-risk silt area is determined, silt change in the area is monitored, and thus the reservoir capacity change is mastered. The application can accurately and dynamically monitor reservoir siltation, clearly determine a high-risk area and a change mode, construct a dynamic database, update the capacity change in real time, and provide important technical support for reservoir management and flood control and disaster reduction.

This invention provides a method for determining the optimal dosage of dewatering flocculant in river silt, belonging to the field of silt treatment technology. The invention first removes large impurities from the river silt and stirs it to obtain pretreated silt. Then, samples of the pretreated silt are taken, and the sand content of the samples is measured. Finally, the measured sand content is substituted into a fitted formula relating the sand content to the optimal dosage of dewatering flocculant to calculate the optimal dosage of dewatering flocculant required for treating the river silt. This invention only requires consideration of the river silt particle size distribution, primarily based on the sand content, to determine the optimal dosage of flocculant during vacuum dewatering. The determination method is simple and easy to implement, facilitating the resource utilization of silt.

The application belongs to the technical field of shield construction, and discloses a method and system for early warning of settlement trend of shield construction crossing a dam; the method comprises the following steps: collecting silt layer geological data before the shield crosses the dam, and analyzing to obtain the distribution range and sensitivity level of the silt layer; collecting the tunneling parameters in real time in units of each ring when the shield machine crosses the silt layer section, and analyzing to obtain the disturbance index; collecting the real-time tunneling speed and the cutter head rotating speed, and recording the shutdown parameters when the complete shutdown condition is met; collecting the slurry tank pressure and the shutdown duration during shutdown, and calculating the pressure data; for the current sensitivity level, the preset hierarchical early warning rule is adopted, the current disturbance index basic threshold is corrected to obtain the corresponding dynamic threshold, the pressure data is compared with the dynamic threshold, and the early warning is issued according to the preset trigger logic classification; and the application improves the safety of shield construction crossing the dam.

The invention discloses a parallel septic tank construction method applied to double-layer deep and thick sludge geology, and relates to the technical field of building construction, the method comprises the following steps: S1, construction preparation; s2, supporting construction; s3, foundation reinforcement construction; s4, implanting a core pile: vertically pressing the core pile into the center of the stirring pile before initial setting of the stirring pile; s5, inner supports are installed, specifically, enclosing purlins and steel supports are constructed; s6, layered excavation is conducted, specifically, after the stirring piles reach the design strength, earthwork layered excavation is conducted till the foundation is reached; s7, pouring a support changing plate: pouring a reinforced concrete support changing plate at the bottom of the foundation pit; s8, parallel septic tank foundation construction is conducted, specifically, reinforcing steel bars are bound on the support changing plate, a formwork is erected, and a septic tank foundation is poured; s9, dismantling the inner support: dismantling the enclosing purlin and the steel support after the support plate to be replaced and the parallel septic tank foundation reach the design strength; s10, mounting a septic tank: hoisting the prefabricated septic tank in place; s11, the steel sheet piles are dismantled; and S12, septic tank backfilling construction is conducted. The construction method has the effect of improving the construction quality.

The utility model belongs to the field of collecting devices, and particularly relates to a silt dam deposited sediment sample collecting device which comprises a fixing seat, an inserting rod is in contact with the bottom of the fixing seat, a support is fixedly connected to the top of the fixing seat, and graduated scales are arranged at the left end and the right end of the support respectively. The outer side of the support is slidably sleeved with two symmetrically-distributed sliding sleeves, the outer sides of the sliding sleeves are fixedly connected with supporting blocks, and the bottoms of the supporting blocks are fixedly connected with a plurality of evenly-distributed positioning rods. Through the design of the positioning rod, the whole structure of the device can be positioned, the insertion rod and the fixing seat structure can be inserted into sediment through the insertion rod, the insertion depth of the insertion rod can be adjusted through the cooperation of the graduated scale, and then the insertion rod and the fixing seat can be separated by pressing the pressing rod downwards. At the moment, the silt can enter the insertion rod, and the purpose of collecting the silt at different depths can be achieved.

The utility model belongs to the technical field of explosion-proof pressure release valves, and relates to an explosion-proof pressure release valve with a sediment-proof structure, which comprises a valve cover, a stainless iron sheet, a pressing ring, a breathable film, a pressing sheet, an inner O-shaped ring, a valve body, an outer sealing ring, a spring and a guide post, the valve cover is designed to be of the flanging structure, the ventilation channel is formed in the side face of the anti-explosion valve, and silt and mud cannot be injected into the anti-explosion valve from the front face; a ventilation gap between the valve cover and the valve body is designed to be smaller than the particle size of silt and mud particles, and silt and mud are blocked outside the anti-explosion valve; according to the explosion-proof valve, the valve cover turnup is adopted, the retaining wall is arranged between the valve cover and the valve body, the retaining wall is higher than the gap of the ventilation channel and forms a labyrinth structure, when water is injected into the explosion-proof valve, the water is blocked by the retaining wall and cannot be directly injected into the explosion-proof valve, the effect of IPX9K is achieved, the ventilation film is protected against damage, and the sealing integrity of the explosion-proof valve during high-pressure water injection is guaranteed; and the upper groove of the valve body is trapezoidal to prevent the inner O-shaped ring from being separated, so that the problem that the O-shaped ring pops up when an existing anti-explosion valve works is solved.

The invention discloses a hydrate-containing sediment exploitation fluid-solid output prediction method. The method comprises the following steps: carrying out reservoir mud and sand particle stress analysis; based on the moment balance principle, a judgment criterion of reservoir sand falling and migration under the hydraulic condition is established, and a reservoir mud and sand particle migration mathematical model is established in combination with reservoir mud and sand particle mass conservation; constructing a multi-field coupling model of hydrate reservoir fluid-solid output; discretizing the multi-field coupling model by adopting an unstructured grid technology, and carrying out decoupling solution by adopting an alternating iteration method; and on the basis of decoupling solution result data, a nonlinear mapping relation from the characteristic parameters to the gas production rate and the sand production rate is established by utilizing a deep learning model, a fluid-solid output prediction model is established, and accurate prediction of the gas production rate and the sand production rate is realized on the basis of the fluid-solid output prediction model. According to the method, the interaction mechanism between the gas production behavior and the sand production behavior of the reservoir can be disclosed more accurately, so that the fluid-solid production rule of the hydrate reservoir can be predicted more accurately.

The invention relates to the technical field of near-well region reservoir development, and particularly discloses a method for evaluating the permeability of pilot production near-well region reservoirs by drilling and production working fluid invasion, which comprises the following steps: selecting shallow surface layer muddy silt sediment and fine silt of a target sea area as media, and preparing an overlying stratum core and multiple groups of parallel cores with different porosity and water saturation; putting the sample tube into a holder with a nuclear magnetic cavity, introducing methane gas to generate hydrate, and monitoring pressure and nuclear magnetic signals to obtain a hydrate reservoir core; reversely injecting cold water to test the permeability before liquid phase invasion; injecting a microbial solution and a nutritive salt solution for culture and reinforcement, testing permeability before and after reinforcement, and analyzing the influence; drilling fluid, well completion fluid, reservoir transformation working fluid, transformation working fluid carrying permeation enhancing materials and ethylene glycol mining fluid are injected under the same conditions to simulate invasion, nuclear magnetic signals are monitored, the permeability after invasion is tested, and the damage degree before and after reinforcement and the anti-invasion effect are compared.

The invention discloses a suspended sediment transportation and reservoir desilting system, and relates to the technical field of hydraulic engineering, the system comprises an acoustic control array module used for forming an acoustic potential well in water above a reservoir bottom sludge layer to capture sediment particle groups in the reservoir bottom sludge layer; the sediment gathering and collecting module is used for collecting sediment particle groups and gathering the sediment particle groups at a sediment gathering target point to form slurry; the control unit is used for generating an acoustic potential well moving path based on the acoustic control array module position information, the reservoir bottom terrain and the sediment collection target point, and is used for controlling emission parameters of the acoustic control array module based on the acoustic potential well and the movement state of the sediment particle population and the concentration of the sediment particle population; according to the invention, non-contact, directional and collaborative transportation of sediment particle groups can be realized, and the sediment particle groups are orderly guided to a collection point, so that low-energy-consumption, low-disturbance, high-efficiency and intelligent dredging operation is realized.

The invention discloses an opening method of a desilting bottom hole gate, which is realized through a gate body with a silt flushing function, the desilting bottom hole gate comprises a silt flushing pipeline arranged in the gate body, an inlet of the silt flushing pipeline is connected with a high-pressure water supply device on the outer side of the gate body, and an outlet of the silt flushing pipeline is arranged on an upstream face and a downstream face of the gate body. A check ring fixedly connected with the inner wall of the pipeline is arranged at an outlet of each silt flushing pipeline, and a fixing plate and a one-way opening fender are arranged on the outlet side of each check ring. The opening method comprises the steps that firstly, the high-pressure water supply device is started, the fender is opened under the action of the water flow pressure of an outlet of the silt flushing pipeline, silt deposited near the gate body is flushed away through silt flushing water flow, meanwhile, the deposited silt is disturbed, and after the opening resistance of the gate body is reduced, the gate body is opened. The operation mode that silt is flushed first and then the gate is opened is adopted, the gate opening force of the gate is reduced, the gate can be normally opened, silt in front of the gate is discharged to the downstream of a reservoir in time, and silt in a reservoir area is removed.

The utility model discloses an assembly type cofferdam, relates to the technical field of cofferdams, and aims to solve the problems that when silt is poured between two metal baffles, a large amount of dust is raised by the silt, the surrounding environment of a river channel is influenced, and the environmental protection effect is influenced. According to the technical scheme, the device is characterized by comprising a plurality of guide columns and baffles spliced with each other, the guide columns and the baffles are detachably connected, a plurality of supporting rods are detachably connected to the guide columns, a working platform is detachably connected to the supporting rods, cavities are formed in the baffles, water conveying pipes are fixedly connected into the cavities, and one ends of the water conveying pipes penetrate through the baffles to the outside. When the cofferdam is constructed, river water can be poured into the cavity through the baffle and the cavity in the baffle, so that the weight of the baffle is increased, the stability of the baffle is improved, the baffle is prevented from being washed away by a riverway, the river water is poured into the baffle, a large amount of dust cannot be generated, the surrounding environment of the riverway is prevented from being influenced, and the environmental protection effect is improved.

The invention provides a wide valley U-shaped channel mountain torrent debris flow prevention and control method based on a mountain torrent sediment transport rule, and the method comprises the steps: determining a formation region, a circulation region and an accumulation region of a large watershed debris flow channel, and determining debris flow channel parameters; determining the characteristics of the mud mark section; calculating debris flow characteristic parameters; a target bedrock section is selected, and the design height of a target dam body is calculated according to section characteristics of the target bedrock section, debris flow channel parameters, mud mark section characteristics and debris flow characteristic parameters; according to the method, an open type grating dam is arranged at a section where flood is often encountered, rolling type earth and rockfill dams are arranged at other positions of the section, and design construction is carried out according to a target design specification and the design height of a target dam body, so that the problem that when debris flow occurs, an existing prevention and treatment project loses efficacy due to deposition of silt carried by long-term erosion of mountain torrents is solved; and the service life of the prevention and treatment project in the drainage basin is greatly prolonged, and the expected effect can be achieved when debris flow occurs.

The utility model discloses a hydrological sediment collecting device, and relates to the technical field of sediment collection, the hydrological sediment collecting device comprises a height adjusting mechanism and a collecting mechanism, the height adjusting mechanism comprises an electric push rod, a support plate, a motor, a support seat, a turntable, a threaded rod and an adjusting seat. The electric push rod drives the collection mechanism to integrally and horizontally move, silt enters the collection barrel when the collection barrel moves, then the collection barrel is sealed, and meanwhile, the electric push rod drives the collection mechanism to horizontally move back to the original position, so that silt sample collection of one water layer is completed; according to the device, the motor drives the turntable to rotate, so that the collecting mechanism can adapt to environments with different water depths, sediment samples of different water layers can be accurately obtained, the sediment samples of the different water layers can be collected only through one-time underwater operation, and the collecting efficiency of hydrological sediment is improved.