8 results about "Kinematic wave" patented technology

The invention belongs to the technical field of watershed hydrological process simulation research, particularly relates to a distributed storage and hypersonic dynamic combination model construction method based on water and soil conservation measures, and solves the technical problems that an existing loess plateau region hydrological model is low in simulation precision and poor in applicability. Firstly, a research area is subdivided into a plurality of uniform grids through uniform grid division, and each grid represents different underlying surface features; the method comprises the following steps: carrying out an observation test on a typical field slope of a loess plateau to obtain observation data under different water and soil conservation measures, and determining a model parameter range in each grid under the water and soil conservation measures. According to the method, the rainfall-runoff process in each grid is linked with each other by combining a one-dimensional motion wave equation to form a complete distributed storage hyperdynamic combined model, the model structure can dynamically reflect runoff production mechanisms of different grid units, and the prediction capability of the model is improved.

The present invention discloses a landslide simulation method, system, device and storage medium based on the kinematic wave equation, belonging to the technical field of landslide simulation. The method includes: simulating the landslide movement using the kinematic wave equation; obtaining the parameters required for the simulation, where the parameters include the terrain slope; calculating the landslide movement speed using a friction model; and performing special processing on the landslide movement speed through the terrain slope. Based on the terrain slope data obtained by remote sensing, this application simulates the landslide movement using the kinematic wave equation, obtains the parameter required for the simulation - the terrain slope, calculates the landslide movement speed using a friction model, and performs special processing on the speed through the terrain slope, which can improve the stability of the simulation to simulate the landslide accumulation depth and flow state at different times. By combining the kinematic wave theory and the friction model, this application can effectively simulate the movement characteristics of landslides under different conditions through accurate calculation, providing a scientific basis for disaster prevention and mitigation of landslides.

The application discloses a high-resolution flood simulation method coupling topological optimization motion wave and cellular automata, comprising the following steps: obtaining the basin data of a target region, and re-projecting the basin data to a high-resolution grid coordinate system to construct an upstream and downstream relationship grid graph; traversing the upstream and downstream relationship grid graph, taking the rainfall runoff obtained at a current time as a lateral inflow, combining a water flow state at a previous time step and an inflow state of a corresponding grid in an upstream to construct a one-dimensional motion wave equation, and solving the one-dimensional motion wave equation to obtain a river water level at the current time; taking the river water level as an initial condition, starting a two-dimensional diffusion process on the basis of the upstream and downstream relationship grid graph, and iteratively obtaining a submerged range and a water depth distribution graph at the current time step; and repeating the above steps to obtain the submerged range and the water depth distribution graph at all time steps. The method provided by the application can realize fast deduction of a large-scale, high-resolution and physically strictly conservative flood evolution process.

The invention relates to the technical field of hydrological analysis and calculation, particularly discloses a flood forecasting method based on structure optimization of a full storage and runoff production model, and aims at overcoming the structural defects of a traditional Xinanjiang model, so that the simulated water circulation process is more fit with the actual situation of a drainage basin by improving runoff production, runoff discharge and a multi-source confluence module of the model. The method comprises the following steps: firstly, introducing an infiltration model related to the soil water content in the aspect of a mixed runoff production mechanism, and deducing a calculation formula of the real-time infiltration capacity of a drainage basin based on a soil water storage capacity curve; secondly, a dynamic outflow and confluence module with a complete theoretical basis is constructed in combination with a water tank outflow and motion wave theory; by the adoption of the flood forecasting method based on structure optimization of the full storage runoff production model, the optimized model can more accurately reflect the hydrological process of dynamic change, can be better applied to runoff forecasting work under different scenes, and can greatly reduce the requirement for forecasting experience of technicians.

The invention discloses a landslide simulation method, system and device based on a kinematic wave equation and a storage medium, and belongs to the technical field of landslide simulation. Parameters required by simulation are obtained, wherein the parameters comprise the terrain gradient; calculating a landslide movement speed by using a friction model; and the landslide movement speed is specially processed through the terrain gradient. The landslide movement is simulated by adopting the kinematic wave equation based on the terrain gradient data obtained by remote sensing, the parameter-terrain gradient required by simulation is obtained, the landslide movement speed is calculated by using the friction model, and the speed is specially processed through the terrain gradient, so that the simulation stability can be improved; the landslide accumulation depth and the flowing state at different moments are simulated; according to the method, the motion wave theory and the friction model are combined, the motion characteristics of the landslide under different conditions can be effectively simulated through accurate calculation, and a scientific basis is provided for disaster prevention and reduction of the landslide.

A rainwater pipe network design calculation method based on motion wave simulation belongs to the technical cross field of urban rainwater pipe network and hydraulic model. The method adopts the way of runoff coefficient and phi index method to simulate the surface runoff process, is coupled with the equal flow time line method, and completes the calculation of the inflow process line of the rainwater inlet. Based on the secondary development of SWMM, the motion wave module of SWMM is called to simulate the pipe section confluence process, and the simulation results are read. With the flow process line calculation as the core, from the upstream pipe section, the rainwater inlet inflow process line of the design pipe section and the flow process line of the upstream pipe section connected with the design pipe section are superposed, and the peak value is taken as the design flow of the pipe section. Based on the GDAL development technology, the traditional hydraulic design method is adopted to realize the step-by-step design of the pipe network from top to bottom. The motion wave is used to calculate the pipe section confluence, the whole flow process is considered, the actual flow state of the rainwater pipe network is closer, and the design precision of the rainwater pipe network is improved.

The invention discloses a flow calculation method, system and equipment based on a differentiable hydrological physical model, and belongs to the field of hydrological forecasting, the method comprises the following steps: carrying out iterative calculation on the total runoff volume of all grid units under each time step length through a target equation to output regional flow, the target equation is an equation obtained by performing finite difference differentiation conversion on a kinematic wave simplified equation of a Saint-Venant equation set; judging whether the regional flow meets a preset precision condition or not, if not, not calculating the gradient of the target equation, and when the condition is met, calculating the gradient under the current iteration; and if the gradient meets a preset gradient condition, iteration is stopped, and the target area flow of the target area under each time step length is output to realize flow calculation of the target area, so that the flow calculation speed can be improved through implementation of the method and the device, and the timeliness of flood simulation forecast is improved.

The invention discloses an expansive soil cutting atmospheric influence depth analysis method based on fracture dominant flow, which comprises the following steps: describing moisture movement in saturated-unsaturated soil in a matrix domain through a Richards equation, and calculating to obtain moisture content and water head distribution at different time steps; combining the power exponent relationship between the volume flux density of the fracture dominant flow and the macropore volume water content with a kinematic wave model, establishing a kinematic wave equation representing the kinematic characteristics of the water in the fracture domain, solving the kinematic wave equation, and determining the atmospheric influence depth dc of the fracture domain; through a Green-Ampt model, describing water exchange between a matrix domain and a fracture domain, calculating a wetting front depth and an infiltration rate, and determining an atmospheric influence depth dm of the matrix domain; and combining the fracture domain atmospheric influence depth dc and the matrix domain atmospheric influence depth dm to obtain the expansive soil cutting atmospheric influence depth da. According to the method, the influence of engineering disturbance and natural rainfall on the water infiltration depth can be comprehensively analyzed, and the atmospheric influence depth can be accurately calculated.