138 results about "Sediment transport" patented technology

The invention is a method of developing a sedimentary basin from a stratigraphic simulation of multilithologic filling accounting for fine sediment transport. The sedimentary basin is broken up into geologic layers with each geologic layer being subdivided into a series of climatic layers. Each climatic layer is associated with at least one constant climatic parameter. A stratigraphic simulation is performed within each climatic layer using a stratigraphic model. The sediment transport in the continental domain and sediment bottom layer transport in the marine and lacustrine domains are modelled using nonlinear diffusion equations under maximum erosion rate constraint. Suspended sediment transport in the marine and lacustrine domain is modeled using an advection-diffusion equation accounting for a particle fall rate and of a marine and lacustrine current velocity. The climatic layers belonging to a single geologic layer are then homogenized and the basin is developed according to the stratigraphic simulation results.

The invention relates to a river channel water and sediment real-time prediction method based on data assimilation, and belongs to the technical field of water conservancy projects. The method includes the steps of firstly, collecting topographic data of a water channel to be predicated, upstream boundary condition data, downstream boundary condition data and fracture surface data of the river channel, setting up a one-dimensional non-steady-flow and non-balance sediment transport model, and solving the model; secondly, conducting water and sediment model assimilation on real-time observation data while receiving the real-time observation data, and enabling the assimilation value to serve as an initial field for calculation; thirdly, calculating the changes of the future water level, the further flow and the future sediment concentration according to information of the initial field and the boundary condition data. According to the method, the water level and flow speed prediction function, the flood forecast function and other functions are achieved on the basis of data such as the assimilation real-time water level, the flow speed and the sediment concentration, and the method has the advantages of being strong in pertinency, comprehensive in function, convenient to use, practical and the like, can be applied to river channel flood real-time forecasting of great rivers, and provides the decision-making support for the practical flood prevention command work.

The invention discloses a method for simulating deposition on the basis of deposition process control of reference planes. The method includes analyzing deposition environments of deposition zones by the aid of well logging, mud logging and rock core information and determining change conditions of the reference planes and ancient landform conditions by the aid of burial history information; inputting ancient landforms into hydrodynamic models as initial landforms according to ancient landform analysis, simulating and reconstructing hydrodynamic characteristics of research zones, simulating and reconstructing transportation and deposition of sediment on the basis of hydrodynamic research according to sediment transport and diffusion equations, constraining deposition and denudation of deposits by the aid of the reference planes on the basis of transportation and deposition of the sediment, superposing deposition and denudation of the deposits on the initial landforms to be used as landforms for next simulation so as to carry out cyclic processes for simulating and reconstructing deposition. The method has the advantages that conditions of conditions of the reference planes are considered in simulation processes, and accordingly deposition at basin level can be simulated; the method is short in simulation time, and correction can be repeatedly carried out until requirements of geological characteristics are met.

The invention provides a flocculation kinetics-based cohesive sediment movement numerical simulation method. The method comprises the steps of (1) according to a river bed topography, generating un-structured triangular grids, comprising a main river channel and a beach part; (2) according to a water flow control equation, calculating hydraulic elements of the grids, and giving out upstream and downstream boundary conditions and river channel roughness in the calculation process; (3) calculating out change situations of particle size distribution and sediment settling velocity of cohesive sediment after flocculation; (4) obtaining sediment concentration and river bed erosion and deposition change situations of the corresponding grids; and (5) repeating the steps (2) to (4) until calculation of the whole time period is finished, simulating the whole movement process of the cohesive sediment, and giving out river channel sediment field distribution and river bed erosion and deposition change. The method simulatively calculates particle size distribution change of the cohesive sediment and sediment distribution fields under different hydrodynamic conditions, solves the problem of ignoring or simplification of flocculation influence in cohesive sediment transport simulation, and provides an important technical means for accurate simulation of cohesive sediment movement.

The invention provides an in-situ time-phased sediment trap which is suitable for lakes, rivers and other non-turbulent flow water bodies and can realize long-term monitoring and in-situ time-phased trapping of sediments to prevent a microenvironment of the sediments at the bottom of water from being damaged. The device comprises four parts, namely a base, a support system, a sampling pipe, a pipe frame system and a built-in fixed matrix. The base is of a cylinder with an opening at the upper end, and a convex ring is arranged in the base for carrying the sampling pipe and the pipe frame system; the support system is formed by welding three vertical main rods and a transverse ring sleeve together, the three main rods are distributed like an equilateral triangle and are used for being inserted into soil at the bottom of the water for playing roles in fixing and supporting the base, and four screws are arranged on the ring sleeve and are used for regulating the relative positions between the base and the ring sleeve, so that the height of the base is further regulated; the sampling pipe is detachably matched with the pipe frame system, and the number and the size specification can be customized according to requirements; and the built-in fixed matrix of the sampling pipe can fix the sediments which flow into the pipe in the pipe to avoid re-suspension.

The invention discloses a desilting canal, and belongs to the technical field of sediment treatment in hydraulic engineering. The desilting canal comprises a water inlet canal, a bend, a sediment transport corridor, a rotational flow desilting basin and a water outlet canal, wherein the upstream part of the bend is connected with the water inlet canal; the downstream part of the bend is connected with the water outlet canal; a central angle of the bend is 270 degrees; the water outlet canal passes through the lower side of the water inlet canal; a circular-arc-shaped overflow baffle is arranged in the bend; the bottom position of an inner side wall of the bend is provided with a narrow slit; the sediment transport corridor is positioned below the bend, and is communicated with the bend through the narrow slit; the tail end of the sediment transport corridor is connected with the rotational flow desilting basin. The desilting canal occupies a small area, can be arranged close to a canal head, and can be used for effectively remove coarse silt, so that the problems of difficulty in land acquisition for building the desilting basin at a position far away from the canal head in an irrigated area, easiness of siltation in long-distance transport of coarse silt, and the like are solved.

The invention discloses a maintenance design method for a deeply-eroded exposed coast beach, is applicable to the repair and treatment of a damaged coast, relates to the technical field of coastal zone ecological restoration, and solves the problems that the sandy coast property of a deeply-eroded coast cannot be recovered, and a conventional sand supplementing and maintenance manner cannot restore the deeply-eroded coast. The method has the advantages that a layered structure method using gravels as the filler, the filling structure is a three-layer mixed section structure formed by a beach face energy dissipation layer, a permeation cushion layer and a base layer, and the three filler layers cover sequentially from top to bottom; a profile form is a broken line, the upper portion is a horizontal dry beach part, the elevation H0 of the dry beach part is 100cm above a local design high water level, the width B0 of the dry beach part is 10-20m, the lower portion is an intertidal zone with uniform gradient, and the gradient is 1:5; the protecting function of the beach can be rebuilt, the permeability of the beach is improved, costal sediment transport speed is lowered, coast stability is increased, and a coastal landscape effect is improved.

The present invention discloses a method for constructing a soil erosion coupling model in a subtropical region. The method comprises the following steps that: the erosion problem in the soil and water conservation research is affected by the flow state, the flow velocity, the average water depth, the resistance magnitude, the slope and the like of the slope surface; for the research object of thesoil erosion project in the subtropical region, a separate study needs to be conducted on each indicator to find out the regularity of soil erosion and to strengthen the reflection of soil erosion control; and the slope surface convergence varies along, is unstable, and belongs to three-dimensional movement, but the slope surface flow has typical shallow water wave characteristics such as a widerange, shallow water and the like. According to the method disclosed by the present invention, a numerical simulation model is established by organically coupling a two-dimensional shallow water waveequation, an unbalanced two-dimensional sediment transport equation and a ground elevation variation equation, the numerical model is verified by applying the numerical simulation model to the soil and water conservation experiments in the subtropical region, the law of soil erosion is obtained through practical results, and the variation law and spatial distribution characteristics of the water depth of the slope surface can be accurately simulated.

The invention discloses a modeling method for transferring sand in submarine that includes the following steps: spreading a layer of sand equally on the bottom of the flume; pouring water into the flume; driving water to surging and ensuring he water forms burble; using laser light source and sending the light to the middle section of the surface sand layer and capturing the image information by a camera; after a fully surging time, the sand is fully transferred to the two sides of the flume and stop surging. The invention supplies theory basis for researching to the transferring situation of shoaling sea area.

The invention provides a method for determining the channel forming discharge in the river sink of the tributary stream, and takes hydrological and weather factors of the main stream and the tributary stream into consideration. The method is characterized by comprising the following steps: step 1, distinguishing the steady state of the incoming water and sediment of the tributary stream channel and determining the sediment transport rate index; step 2, performing interval partition on the flow rate data of the hydrometric station at the inlet of the river sink and the water level data of the hydrometric station at the outlet of the river sink; step 3, determining the gradient relation curve of the river sink of the tributary stream; and step 4, drawing a channel forming strength line in the inlet flow rate-outlet water level coordinate plane, and calculating the channel forming discharge by adopting a graphical method.

The invention is a method of modeling a hydrocarbon reservoir. A parameter value in a set of equations is adjusted so that the output of the equations accurately matches observed sediment erosion and deposition behavior for sediment sizes throughout a range of about 10 microns to about 10 centimeters. An initial condition of a sediment bed in the hydrocarbon reservoir is defined. The equations are applied to the initial condition, wherein outputs of the equations express how a fluid flow affects erosion and deposition of sediments at the initial condition. The initial condition is adjusted based on the equation outputs to create a subsequent sediment bed condition. The equations are re-applied to the subsequent sediment bed condition a pre-determined number of times. The subsequent sediment bed condition is re-adjusted after each re-application of the equations. The model of the hydrocarbon reservoir is created and outputted.

The invention discloses a debris flow sediment transport control method suitable for a broad valley type debris flow gully. The transverse width of the broad valley type debris flow gully is 50-400 m, and the longitudinal gradient of a gully bed is smaller than or equal to 15 degrees; a sediment transport groove in the gully bed is backfilled by utilizing existing loose solid materials on the gully bed in the flowing area and accumulation area of debris flow in the gully, and the ground line curvature of the backfilled groove is smaller than three percents; multiple sand blocking cob walls distributed at a certain interval are transversely built by utilizing the existing loose solid materials on the gully along the gully contour line in the flowing area and accumulation area of the debris flow in the gully; deep-rootedness arbores or bamboos are planted at the edges of the cob walls along the trend of the cob walls in the shape of a strip. According to the method, not only is sediment effectively prevented from entering a main river, but also a large amount of the blocked sediment can be locally converted into precious land resources, and the comprehensive corporate governance goals of achieving low governance cost and high economic benefit, changing harm to benefit and improving the ecology landscape of the gully are achieved.

The invention relates to an intuitive analysis method of an ecological water demand monthly scale on the basis of a water demand for sediment transport. Requirements on environmental elements by water demand for sediment transport which has a most prominent contradiction on ecological and production water demand are used as a representative month ecological target, a representative month ecological water demand is determined, the yearly time change rate of average natural runoff volume of multiple years is adopted as a yearly time change target of the ecological water demand, finally, the month-by-month change difference of the ecological water demand is finally determined, and the month-by-month change difference requirement of the ecological water demand is intuitively analyzed. The intuitive analysis method avoids redundish calculation workload and data quantity demands, and effectively realizes a purpose of the intuitive analysis of the ecological water demand monthly scale difference.

The invention discloses a modeling device that is made up of a control device, and a U shaped tube. One end of the U shaped tube connects to air and the other connects to winding machine by pipe. A control valve is set on the pipe that the winding machine connects to U shaped pipe. A seabed modeling installation section is set on the bottom section of the U shaped tube, where the seabed model is installed. The winding machine and the control valve electrically connect to the control device. The invention supplies theory basis for researching to the transferring situation of shoaling sea area.

The invention discloses a composite-stratum shield tunneling machine waste-soil transporting system, and solves the problems that when shield tunneling is conducted in a composite stratum, an assembly operating area in a shield tunneling machine is prone to accumulating water, and the operating environment is prone to being polluted by waste soil. The composite-stratum shield tunneling machine waste soil transporting system comprises a shield-tunneling-machine soil bin (1), a screw conveyor (2) is connected on the shield-tunneling-machine soil bin (1), the head end of a belt-conveyor bridge-frame slope section (4) is arranged below a soil discharging port (3) of the screw conveyor, and a water-blocking arc-shaped plate (6) is arranged at the head end of the belt-conveyor bridge-frame slope section (4); and a residue-blocking rubber-sheet closed cylinder (14) is connected on the soil discharging port (3) of the screw conveyor, a buffering rubber roller set (7) is arranged below head-end belt of a conveying belt (8) on the belt-conveyor bridge-frame slope section, mud blocking plates (12) are arranged on the two sides of a conveying belt on a belt-conveyor platform-car flat-slope section (9), and a high-pressure water-spraying system (10) used for conducting spraying on tail-potion belt is arranged at a car-frame tail-portion soil discharging port (11). According to the composite-stratum shield tunneling machine waste-soil transporting system, cleaning of the assembly operating area and safe conducting of assembly operation are ensured.

The invention relates to a numerical simulation method for dredging dredged sediment filling in open water area, which adopts numerical simulation method and uses mike21 software to carry out simulation analysis and calculation, and adopts finite volume method based on element center to carry out discrete solution for two-dimensional shallow water control equation in numerical simulation. The spatial discretization of the numerical simulation model is based on the finite volume method, dividing the computing region into grids, the overlapping entities are generated into discrete grids by solving the governing equations, using the triangular meshes provided by Mike 21 is used for computing, in mike21 water conservancy analysis software, a two-dimensional hydrodynamic model is established, and then the sediment transport module is used to establish the model of the entire external environment. The parameters of external environment factors are inputted for simulation analysis, and the target output is obtained. By comparing the simulation results with examples, the accuracy of numerical simulation calculation in dredging and hydraulic fill engineering is verified.

A distribution of sand sediment class in a subsurface of the Earth is identified. Three-dimensional stratigraphic images of sediment distribution in a subsurface of the Earth are constructed, including at least two depositional domains, by simulating sediment transport and deposition over a selected time interval of sediments originating from one or more clastic sediment input sources. The simulation uses at least two equilibrium surfaces bounding the at least two depositional domains and at least two sediment classes, and updates the equilibrium surfaces in a sequence of timesteps, by accounting for sediment feed from the one or more clastic sediment input sources, erosion and deposition in accordance with mass-balance equality constraints. The images are used to identify a distribution of sand sediment class in the subsurface of the Earth suitable for acquiring hydrocarbons or fresh water, or for storing gas or liquids.

The invention provides a method and system for measuring flow field information and sediment transport characteristics of an inclined-tube-type sedimentation basin. The method comprises the steps of collecting single-point three-dimensional instantaneous flow rates and single-point turbidity information of a plurality of measuring points in the target inclined-tube-type sedimentation basin and information of the vertical distance from all the measuring points to the sediment surface of the basin bottom separately; based on the single-point three-dimensional instantaneous flow rates, calculating the flow field information of two-phase flow of all the measuring points in three corresponding dimension directions separately; based on the single-point turbidity information and the vertical distance information, calculating the sediment transport characteristics in the target inclined-tube-type sedimentation basin, wherein all the measuring points are selected from a plurality of measurementsections arranged in the target inclined-tube-type sedimentation basin in the three corresponding dimension directions separately. By means of the method, the flow field information and sediment transport characteristics of the complete water-sediment two-phase flow of the inclined-tube-type sedimentation basin can be effectively measured, and therefore a more reliable technical basis is providedfor further optimization of the structural form of the inclined-tube-type sedimentation basin.

The invention discloses a sediment particle three-dimensional simulation motion monitoring experiment device which comprises a water tank for generating water flow, a stocker for storing a plurality of simulation sediment particles is arranged at the water tank, and after a discharge port of the stocker is opened, the simulation sediment particles are released into water. The simulated sediment particles are provided with sensor devices for acquiring three-axis direction stress and motion trail data of the simulated sediment particles, and the simulated sediment particles are also provided with wireless devices for sending data to a computer terminal. The tail end of the water tank is further provided with a measuring device for measuring the transport rate of the simulated sediment particles, and the measuring device is in signal connection with a computer terminal. The device can accurately simulate the entrainment and collision of sediment particles in water flow and analyze the motion trail process. Meanwhile, the simulated sediment particles are collected at the tail end of the water tank, the real-time sediment transport rate of the simulated sediment particles is measured, and new insights and understanding are provided for the water flow sediment carrying motion mechanism.

The invention discloses a research method based on a GAMLSS model sediment transport contribution rate. The method comprises the steps of firstly collecting and arranging flow and sediment informationof a drainage basin outlet station; then computing a relation between each index and sediment transport and a fitting process line, computing 90% P-factor and R-factor, 50% quantile sequence varianceand a mean value, a correlation coefficient and an AIC; then using an attribution analysis method to analyze six indexes, thus acquiring an influence degree of each index on sediment transport variation; and at last, computing a contribution rate of each index to sediment transport. According to the research method based on the GAMLSS model sediment transport contribution rate provided by the invention, the problem that the prior art cannot accurately and comprehensively acquire the influence degree of the climate change and the human activities on the sediment transport contribution rate issolved, the principal component regression analysis is used, the influence of multicollinearity is eliminated, the influence generated by each variable mean is considered, and the influence of each variable interannual variance change on sediment transport is also considered.

The invention provides a cascade reservoir sediment real-time forecasting method which comprises the following specific steps: step 1, forecasting the flow and sediment content process of a main control station in the next few days according to a water-sediment relation model based on real-time water regime information and a hydrology method; step 2, based on the real-time rain condition information, establishing an interval rainfall sediment production and transportation model to provide a branch flow and a sediment content process of warehousing in the next few days for the main branch; step3, carrying out simulation prediction on the reservoir area water and sediment transport process; and step 4, counting forecast results. According to the method, the incoming sediment amount information of the reservoir in different forecast periods can be mastered and known in time, the method has very important significance in formulating a reservoir scientific dispatching scheme, and the blankof large reservoir sediment forecast on a sediment-deficient river can be filled up.