18 results about "Hydrograph" patented technology

The invention relates to the technical field of flood control dispatching, and discloses a reservoir flood control water level dynamic control and flood recycling method and system, and the method comprises the steps: obtaining a surface rainfall forecast value of a reservoir basin based on real-time rainwater condition data and numerical weather forecast; a hydrodynamics and hydrology coupled drainage basin runoff model is driven, and an in-reservoir flood hydrograph in a predicted period is generated; judging the flood scale and grade based on the hydrograph, and when the flood is medium and small flood, calculating the dynamic flood control storage capacity of a downstream flood control object by adopting an equivalent flood control effect algorithm taking into account the pre-discharge scheduling capability; according to the dynamic flood control storage capacity, a dynamic flood control water level control value is obtained through backstepping of a water level-storage capacity relation curve of the reservoir; and finally, generating and executing a reservoir dispatching instruction based on the control value, and storing the water level of the reservoir to not exceed the dynamic value. The problems that a fixed flood control water level method is low in water resource utilization rate and inflexible in dispatching are solved, and flood resource efficient utilization on the premise of flood control safety is achieved.

The application provides a built hydropower station operation water level lifting method based on staged design flood, comprising: analyzing flood seasonal variation law of a target hydropower station reservoir, carrying out flood staging on the target hydropower station reservoir flood, and proposing design flood and design flood hydrograph of different periods; constructing a hydropower station reservoir area water surface line calculation model, combining the design flood of the target hydropower station reservoir to calculate the reservoir water surface line under each starting push water level of different periods; constructing a hydropower station flood regulation model, combining the design flood hydrograph of the target hydropower station reservoir to calculate the reservoir highest flood regulation water level under each starting regulation water level of different periods; based on the reservoir water surface line and the highest flood regulation water level, combing the water level lifting opportunity, the water level lifting scheme is drafted. Through the application, the problem that the existing related technology cannot fully tap the comprehensive benefits of the project is solved.

The invention provides a reservoir spillway flood regulation calculation method and device and electronic equipment, and the method comprises the steps: firstly selecting a reservoir original design flood hydrograph of a frequency corresponding to a target standard, then selecting a gate control working condition of a reservoir spillway, and carrying out the regulation calculation of the flood of the reservoir spillway based on the reservoir original design flood hydrograph and a reservoir original discharge capacity curve; and determining a reservoir design flood hydrograph and a reservoir discharge capacity curve corresponding to the gate control working condition, and then performing flood regulation calculation by adopting a water balance method based on the gate control working condition, the reservoir design flood hydrograph, the reservoir discharge capacity curve, the normal storage level of the reservoir and the water level storage capacity curve of the reservoir to obtain a reservoir flood regulation hydrograph. By adopting the method, the efficiency and the accuracy of reservoir flood regulation calculation can be improved, so that the working efficiency of reservoir project spillway type comparison and selection can be improved.

The invention belongs to the technical field of flood forecasting, and particularly relates to a method for calculating post-wave water level by sudden flood forecasting flow, which comprises the following steps: S1, acquiring hydrological observation and flow forecasting data, and determining a calculation control node; s2, calculating a first adaptive flow and a first water level before the node 2; s3, calculating a first adaptive flow and a first water level behind the node 2; s4, calculating a second adaptive flow and a second water level before the node 2; s5, calculating a second adaptive flow and a second water level after the node 2; s6, according to the first adaptive flow, the first water level, the second adaptive flow and the second water level, the water surface gradient process is calculated; and S7, outputting a post-wave water level forecast calculation result according to preset data submission ending time. According to the method, two post-wave flood indicating flow hydrographs and corresponding water level hydrographs can be generated, and the technical level of post-wave water level forecasting of the flood is effectively improved.

The invention discloses a reservoir group flood resource utilization chain risk analysis method, which comprises the steps of fitting error probability distribution based on weather rain-free forecast data, and generating a water recession section flow probability forecast scene set; inputting a recession section flow probability forecasting scene set, and determining a reservoir regulation starting water level probability sample by adopting a dynamic allocation method considering flood space distribution and a real-time state; based on historical flood data, a graph neural network is adopted to learn reservoir group topological correlation features to optimize a spectral clustering process, and a neural gas algorithm is utilized to generate a design flood hydrograph scene; a whole-process flood control chained risk decision-making tree is constructed by fusing a scheduling starting water level probability sample and a design flood hygrograph scene, and a double-threshold risk early warning mechanism based on CVaR and VRR is established through full-path scheduling simulation and risk contribution degree backtracking analysis. According to the invention, multi-source uncertain chained coupling is realized, and the accuracy of risk assessment and the reliability of decision making are improved.

The invention relates to the technical field of flood management, in particular to a flood risk assessment method and system based on multi-dimensional data integration analysis. The method comprises the following steps: acquiring a multi-dimensional data set including geographic information data and hydro meteorological data; determining a water flow direction by using the geographic information data, and identifying a catchment area based on the water flow direction; carrying out drainage basin runoff production calculation according to the hydro-meteorological data, and recording runoff volume; executing runoff collection simulation in the catchment area by utilizing runoff volume to form a runoff process line; calculating flood peak flow based on the runoff hydrograph; evaluating the river water level according to the flood peak flow, and calculating the river overflow according to the river water level; generating a submerging depth distribution map according to the river overflow quantity; and performing flood risk prediction based on the submerging depth distribution map, and generating a flood management risk level. Fine evaluation and dynamic prediction of the flood risk are realized based on the flood management technology, and the flood prediction accuracy and the flood control decision efficiency are improved.

The present application relates to a kind of power plant water intake temperature rise characteristic value calculation method based on percentile method, comprising, establish three-dimensional hydrodynamic mathematical model;Tidal current verification of hydrodynamic model;Establish three-dimensional temperature field mathematical model;Warm discharge transport diffusion numerical simulation, obtain water intake temperature rise hydrograph;Percentile analysis of water intake temperature rise hydrograph and water intake temperature rise characteristic value selection;Water intake temperature rise characteristic value calculation formula fitting.The present application is aimed at coastal nuclear power plant as research object, utilizes three-dimensional mathematical model to simulate the transport diffusion of coastal power plant warm discharge, carries out statistical analysis to the water intake temperature rise time hydrograph obtained by calculation using percentile method, selects the power plant water intake temperature rise characteristic value associated with sliding window period and percentile, and a kind of power plant water intake temperature rise characteristic value calculation method is proposed by curve fitting method.The present application provides scientific basis for power plant cold source system design and research work.

The invention discloses a probability design flood deduction method and system based on parameter and form uncertainty. The method comprises the steps of determining distribution parameter uncertainty of flood frequency analysis and process line form uncertainty of design flood process line dynamic synthesis; constructing a Monte Carlo simulation framework; monte Carlo simulation circulation is carried out based on a Monte Carlo simulation framework, combined sampling is carried out on the distribution parameters and the dynamic weight vector expressing the form uncertainty of the hydrograph in each Monte Carlo simulation circulation, complete calculation from design flood peak flow deduction to design flood hydrograph dynamic synthesis is carried out, and the design flood hydrograph is obtained. Generating a design flood hydrograph; and aggregating all the design flood hydrographs generated by the Monte Carlo simulation cycle to obtain a probabilistic result for flood control design. According to the method, the design flood inference is converted from certainty to probability, the result reliability can be systematically evaluated, and a scientific basis is provided for risk-based flood control decisions.

This invention relates to the field of watershed design flood technology, and more particularly to a method for estimating watershed design floods based on a conceptual hydrological model. The method includes the following steps: spatially dividing the watershed according to the underlying surface type and elevation distribution characteristics to form slope zones and channel zones, and determining the water transfer sequence between each zone to establish the zoned hydrological structure of the conceptual hydrological model; based on the zoned hydrological structure, extracting historical flood events and identifying the critical humidity conditions for the transition from water storage to runoff generation in each zone; mapping the critical humidity conditions to zoned runoff generation parameters and integrating them to form a baseline parameter structure; extracting the temporal structure characteristics of design storms in the watershed and calculating their structural similarity to historical flood events; this invention, through the estimation of watershed design floods, enables accurate calculation of the watershed design flood hydrograph and reliable extraction of the design flood peak value, thereby improving the accuracy of design flood simulation and the reliability of flood control projects.

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 discloses an intelligent water conservancy monitoring method and system based on digital twinning, and relates to the field of water conservancy monitoring, and the method comprises the steps: constructing a basic hydrological map structure, generating M meteorological hydrological map structures, sorting the M meteorological hydrological map structures, generating a hydrological map sequence, intercepting Q hydrological map time sequence samples from the hydrological map sequence, the method comprises the following steps: generating a pre-trained water conservancy monitoring model, constructing a meteorological hydrological diagram structure in a current time window, inputting the meteorological hydrological diagram structure into the water conservancy monitoring model to predict reservoir inflow and reservoir outflow of N hydrological nodes in L time windows in the future, and calculating the reservoir inflow and reservoir outflow of the N hydrological nodes in the L time windows in the future based on the reservoir inflow and reservoir outflow of the N hydrological nodes in the L time windows in the future. According to the method, the reservoir entry flow and the reservoir exit flow of the multiple key nodes in the whole watershed in the future time period can be synchronously output, the accuracy of multi-node flow prediction is remarkably improved, and the abnormal water regimen early warning level of water conservancy monitoring is improved.

The invention discloses a water quality hygrograph-based plain river network non-point source pollution risk assessment method, which comprises the following steps of: firstly, constructing a hydrological-hydrodynamic-water quality coupling model based on underlying surface characteristics, generating a section water quality dynamic hygrograph by referring to a hydrological hygrograph concept and combining a water quality comprehensive index, and defining normal and risky water quality states; calculating the water quality anti-interference performance (I), the damage degree (V) and the recovery capability (R); and finally, on the basis of the river network section water quality risk values, a non-point source pollution risk distribution diagram is generated through spatial interpolation backstepping. The method solves the problem that traditional static assessment is difficult to describe pollution pulse impact and instantaneous standard exceeding risks and neglect the toughness of a water environment system, reversely derives spatial distribution of non-point source risks by assessing the river network section water quality risk, is accurate in assessment result and has spatial visualization ability, and is suitable for popularization and application. The method is easy to popularize and apply in complex hydrological areas such as plain river networks, and provides a scientific basis for precise pollution prevention and control.

The invention belongs to the technical field of flood forecasting, and particularly relates to a method for calculating a wavefront water level through sudden flood forecast flow, which comprises the following steps: acquiring hydrological observation and forecast data of session flood in real time, and determining a fixed node for wavefront water level forecast calculation; determining whether the forecast initial flow needs to be corrected; determining an initial flow correction control node for initial flow correction; converting the forecast traffic into adaptive traffic; filtering the adaptive traffic to generate first adaptive traffic; converting the first adaptive traffic into second adaptive traffic; calculating a first water level; converting the first water level into a first corrected water level; calculating a second water level; converting the second water level into a second corrected water level; calculating a water surface gradient process; and ending the flood wavefront water level forecasting operation of the session, and outputting a wavefront water level forecasting calculation result. According to the method, two wavefront flood flow hydrographs and corresponding water level hydrographs can be generated, and the technical level of flood wavefront water level forecasting is effectively improved.

The present belongs to the technical field of reservoir operation, including following steps: selecting a dammed river to be tested, determining a study area in a riparian zone downstream of a dam, obtaining historical long-sequence water level data of the study area, and analyzing duration and amplitude variation ranges of a historical water level; setting a plurality of groups of flood waves according to the duration and amplitude variation ranges; establishing a riparian zone nitrogen transport and transformation numerical model to simulate a denitrification level of the riparian zone under different flood wave conditions; obtaining an A / T ratio value of one flood wave corresponding to a maximum value of denitrification capacity of the riparian zone according to results of all cases; and taking the obtained A / T ratio value as a threshold of a reservoir discharge hydrograph.

This invention discloses a method and system for analyzing the damage caused by flood erosion to pipeline protection projects. Applied to the field of pipeline protection analysis technology, the method includes: determining the watershed where the pipeline is located and the mountainous area within that watershed; analyzing and evaluating the unit hydrograph and instantaneous unit hydrograph of the flood based on various types of rainfall data within the mountainous area, converting flood flow data to obtain flood flow data, and predicting flood characteristics; acquiring the pipeline's engineering characteristic information, analyzing the degree of flood damage to the pipeline based on the acquired flood characteristics, and obtaining damage mode analysis results; conducting pipeline damage probability analysis based on the flood probability and damage mode analysis results, obtaining damage probability analysis results, and issuing early warnings based on the damage probability analysis results. This solves the technical problem in existing technologies where it is difficult to predict the probability of pipeline damage under flood erosion and cannot quantitatively assess the risk of pipeline flood disasters.

This invention discloses a chain-based risk analysis method for flood resource utilization in reservoir groups, comprising: fitting an error probability distribution based on meteorological no-rain forecast data to generate a set of probability forecast scenarios for the receding water level; inputting the set of probability forecast scenarios for the receding water level and employing a dynamic allocation method considering the spatial distribution and real-time status of floods to determine the probability samples of the reservoir's initial regulation water level; using graph neural networks to learn the topological association features of the reservoir group based on historical flood data to optimize the spectral clustering process, and using a neural gas algorithm to generate a design flood hydrograph scenario; fusing the probability samples of the initial regulation water level and the design flood hydrograph scenario to construct a chain-based risk decision tree for the entire flood control process; and establishing a dual-threshold risk early warning mechanism based on CVaR and VRR through full-path scheduling simulation and risk contribution backtracking analysis. This invention achieves chain-based coupling of multi-source uncertainties, improving the accuracy of risk assessment and the reliability of decision-making.

The invention provides a plain river network area flood drainage project design scale determination method and device, and the method comprises the steps: firstly generating a design flood process line and a design tide level process line of a plain river network area based on the tide level observation data and rainstorm data of the plain river network area over the years; then, based on the underwater topographic data of the plain river network area regulation and storage water body, establishing a corresponding relation between the water level and the volume of the plain river network area regulation and storage water body; determining the highest flooding control water level of the plain river network area based on the planning information and the topographic information of the plain river network area; and finally determining the design scale of the flood drainage project of the plain river network area based on the designed flood hydrograph, the designed tide level hydrograph, the corresponding relation, the highest flood control water level and the parameter information of the flood drainage project of the plain river network area. By adopting the method, the rationality of the plain river network area drainage engineering design can be effectively improved.

The invention provides a method for determining the critical overtopping flood scale of a reservoir dam, and belongs to the technical field of water conservancy project evaluation, and the method comprises the steps: S1, obtaining key basic data of a reservoir; s2, fitting the flood peak flow data and the flood process detailed data of the flood in different recurrence periods to obtain a corresponding flood flow hydrograph Q in (t); s3, a certain flood flow hydrograph Q < in > (t) is combined with the water level-reservoir capacity-floodway discharge capacity curve to obtain a corresponding flood regulation discharge flow hydrograph Q < out > (t); s4, judging whether the flood process is critical overtopping flood or not by utilizing the flood flow hydrograph Q in (t) and the flood regulation discharge flow hydrograph Qout (t); and S5, outputting the flood parameters of the critical overtopping flood. According to the method, the reservoir inventory and the critical overtopping flood scale are combined, and the flood parameters can be accurately determined.