53 results about "Hydrograph" patented technology

Watershed hydrology analysis and management process and system with a network of weather stations and artificial drainage systems with artificial and natural reservoir management through locks and pumping stations. It evaluates potential hydrologic risk in each area and analyses the possible consequences of future precipitations using simulations. To make the simulation, it calculates hydrographs for each sub-basin, streams and rivers in the basin. It simulates the behavior of the basin under different scenarios corresponding to different types of management of the operation of locks and/or pumps and compares its results in terms of loss of flooded area, economic loss in each area, loss for flooding of urban areas, etc. Optimization of the simulation through artificial intelligence (AI, meta-heuristic algorithms, neural networks, etc.) allows it to act as a search engine to find better solutions and the best configuration of resource management that allows minimizing the socio-economic impact on each basin.

The invention discloses a water level monitoring system based on image processing and a method, which mainly solve the problem that water level cannot be monitored automatically in the prior art. The water level monitoring system comprises a water level gauge, a water level image processing module, a wireless communication module and a central management server module. Working principle of the system is that: firstly the water level gauge is used for marking the water level, water level images marked by the water level gauge can be collected by a camera, the water level image processing module further performs automatic positioning, skew correcting and recognizing on the water level gauge in the water level images to obtain water level data and transmits the water level data to the wireless communication module through a wireless communication network, then the wireless communication module transmits the received water level data to the central management server module which stores the received water level data into a computer data base so as to draw current hydrograph in real time, when the current water level is higher than a preset water level, alarm information can be given out, and accordingly automatic monitoring of the water level can be achieved.

The invention discloses a method for forecasting water burst flood peak and peak time for a karst tunnel underground river. The method comprises the following steps: (1) computing point rainfall; (2) determining areal rainfall according to the point rainfall; (3) computing effective precipitation according to the areal rainfall; (4) computing time interval unit hydrograph; (5) computing effective precipitation unit hydrograph according to the time interval unit hydrograph; (6) computing surface runoff according to the effective precipitation and the effective precipitation unit hydrograph; (7) computing subsurface runoff; (8) adding the surface runoff at each time interval and the subsurface runoff at the corresponding time intervals to obtain flood discharge; (9) performing fitting on value of the flood discharge to obtain a flood hygrograph; and (10) obtaining the flood peak and the corresponding peak time on the flood hygrograph and determining construction time for a karst tunnel according to the flood peak and the corresponding peak time. According to the method provided by the invention, the water burst flood peak in the tunnel and the arrival time of the flood peak can be accurately forecasted, so that the construction time for the tunnel can be reasonably arranged, and the lives of people and the safety of mechanical equipment can be ensured.

The invention discloses a method for regulating and controlling limited downslope tillage of a corroded slope farmland, which comprises the following steps of: firstly dividing each land block on the slope farmland into a plurality of small farming units along the contour direction; and then carrying out downslope tillage on each farming unit. The land blocks are respectively divided into a plurality of small farming units through horizontal ditches or ridges. In the invention, flow lines of sheet flows are cut by dividing the length of the slope; a runoff quantity hydrograph is smoother than that of the original slope surface; the water flow speed of the slope surface is reduced; the resistance time of the sheet flows on the slope surface is prolonged; infiltration is increased; the surface runoff is reduced; the sediment transport capacity of the flow is obviously reduced; soil losses are greatly reduced; and the water and soil conservation capacity of the slop farmland can be effectively improved. The method is simple, convenient and labor-saving to operate, can achieve the effect on soil and fertility conservation by adopting simple measures, has small investment and a low cost and has the characteristics of high efficiency, practicality, convenience for farmers to receive and the like.

The invention provides a method for constructing a geomorphologic unit hydrograph distinguishing confluence speed differences of a slope surface and a channel. The method comprises the steps of calculating flow directions of grids by adopting a D8 algorithm firstly based on digital elevation model (DEM) grid data, extracting a watershed system, and distinguishing the grids into slope surface grids and channel grids; calculating confluence speeds of raindrops during motion on the slope surface and in the channel; calculating the time for reaching a watershed outlet by the raindrops according to specific confluence paths of the raindrops, performing statistics on the number of the raindrops reaching the watershed outlet in each time segment delta t, and calculating percentages of the number of the raindrops in all time segments in a total grid number, namely, coordinate values of an S curve at the moments delta t, 2 delta t, 3 delta t, ......, and n delta t; and calculating a non-dimensional t-hour unit hydrograph and a unit hydrograph of the watershed according to the obtained S curve conveniently. According to the method, the t-hour unit hydrograph of any time segment of the small watershed in the mountainous and hilly area can be conveniently obtained, and flood analysis calculation can be performed in areas without or lack of hydrological data.

The invention relates to an intelligent drainage pump station for pump group optimal dispatching and early warning disposal based on a SWMM model, using the rainfall data forecasted by weather forecast as input condition, By calculating and simulating the runoff amount generated by each sub-watershed at any time with different time steps, as well as the discharge and depth of water in each pipeline and river, the invention combines the calculated flood peak hydrograph with the optimization algorithm to seek the best combination of drainage pumps, and provides an intelligent decision-making anddispatching scheme. The invention calculates the quantified pump station discharge based on the mature weather forecast data and the SWMM hydraulic model. According to the rainfall curve and flood peak hydrograph combined with optimization algorithm to achieve the scientific operation of the pump station, for the formulation of economic and reasonable disposal program to provide decision-making support. Under the condition of heavy rainfall and extreme rainstorm, the forecast data are put in front of the event disposal, so as to achieve the purpose of early waterlogging judgment and early warning, and reduce the risk of waterlogging occurrence.

The invention provides a water and sand dynamic simulation method based on bioflocculation. The method includes the following steps that A, initial river way section data are given, the water power factor of each section is calculated according to the upstream boundary condition, the downstream boundary condition and the river way roughness rate, and then water power factor distribution of a whole river way is acquired; B, the water power factors are used for calculating the water turbulent fluctuation shearing rate and then feature data of suspended sand bioflocculation bodies are calculated through the water turbulent fluctuation shearing rate and measured water quality parameters; C, an upstream sand inflow hydrograph, the water power factors of all the sections and the features of the suspended sand bioflocculation bodies are used for calculating scouring sedimentation and moving transportation of the sand bioflocculation bodies of the corresponding sections, and the river way section condition generated after silt is washed away is given; and D, the step A, the step B and the step C are repeated at corresponding time nodes till calculation of a whole period is finished, the whole river way silt washing-away process is simulated, and the evolvement rule of the river way is provided.

The invention discloses a calculation method of a lake ecological water level. The calculation method comprises the following steps: 1, calculating the water level value of a germination stage: A, finding or establishing a lake water level-area; B, calculating the area of a germination region of hygrophytes and emergent aquatic plants under a given water level; C, calculating the germination area of submerged plants; D, calculating the area of a germination region of aquatic plants; E, calculating the coverage degree of the hygrophytes and emergent aquatic plants and the submerged plants under the given water level; F, calculating the total area of the germination regions of the aquatic plants under different water levels according to step sizes; G, using a water level-vegetation coverage degree relation; 2, calculating the ecological water level value of a seedling growth period; 3, calculating the ecological water level values of growth and diffusion periods; 4, calculating the ecological water level value of a mature period; 5, calculating the ecological water level value of a seed dispersal period; 6, calculating the water level value of a dormancy period; 7, calculating a lake ecological water level hydrograph. The calculation method is simple in calculation process and parameters, and can be widely used in evaluation of ecological water levels of shallow lakes in subtropical areas.

The invention discloses a novel sun-prevention commuting case and relates to a cable cross-connection cabinet. The commuting case comprises a case body, wherein a hollow cylinder is arranged on the case body, a lifting cylinder is arranged in the hollow cylinder, a supporting column is arranged on the top of the lifting cylinder, ribs are arranged on the supporting column and comprise lower nests, stop blocks are arranged on the supporting column, an annular iron ring is arranged on the top of the supporting column, first electromagnets are arranged on the lower nests, an annular supporting plate is further arranged on the lifting cylinder, a motor is arranged on the annular supporting plate, a crank device is arranged on the motor and makes contact with the lower nests, an electronic thermometer and a hydrograph are further arranged on the case body, and water leakage holes are formed in the bottom of the hollow cylinder. Compared with the prior art, strong sunlight can be prevented from directly irradiating to the commuting case, and meanwhile, rainwater can also be blocked on rainy days and prevented from entering the case body. Not only is the problem that because sunlight in summer is strong in the past, the temperature of an outdoor commuting case is too high, and operation of internal electronic components are influenced solved, but also the problem that rainwater leaks into the commuting case on rainy days is solved.

The invention relates to an urban river network waterlogging prevention optimal scheduling method. The method comprises the steps that basic data of all rainwater sub-catchment-areas on the upstream of an urban river network are acquired, SWMM models are constructed correspondingly, rainfall runoff simulation is conducted by inputting rainfall hydrographs, and discharge curves of rainwater pipe network drainage ports of all the sub-catchment-areas are acquired; basic data of an urban river network system is acquired, a river network SWMM model is constructed, the discharge curves, of the drainage ports, acquired in S1 are taken as inflow of the river network model, and the model is used for calculating a system overflow amount and a river and lake water level hydrograph under a specific scheduling strategy; a river network system waterlogging prevention optimal scheduling model is constructed, which comprises an optimized objective function and a decision variable, and optimization isconducted on the decision variable on the basis of a differential evolution algorithm; and coupling of the optimal scheduling model based on the differential evolution algorithm and the SWMM model isrealized in a Python environment, and an optimal waterlogging prevention scheduling strategy of a river network system is iteratively calculated. The method is good in robustness and high in reliability, and the obtained scheduling strategy is beneficial to exerting the regulation and storage capacity of the urban river network system in urban inland inundation.

The invention discloses a method for determining scouring efficiency of water-impermeable surface runoff pollutants on basis of an isochrone method and belongs to the cross field of municipal engineering and environment monitoring. A study area is generalized on the basis of monitoring of the surface runoff pollutants, and runoff speed determination, isochrone division and isochrones area determination are performed with the unit time as the dividing point; next, a water outlet flow hydrograph is drown according to isochrones, the pollutant load capacity Mt in the time period is obtained after the difference between the surface runoff pollutant concentration Ct monitored in each time period and the natural rainfall concentration C0 is multiplied by the corresponding flow Qt; then, the total load capacity sigma M is obtained by accumulating runoff pollutant loads in all time periods, and the delta value is obtained by comparing the sigma M with the pollutant load capacity M of surface swept matter before rainfall; finally, the value range of delta is obtained according to multiple rainfalls, and the magnitude range of the surface runoff pollutant load sigma M formed by certain rainfall in the future is estimated through reverse calculation of delta. The method is simple and easy to understand and is applied and verified.

The invention discloses a method of digitizing paper hydrological data. A computer is used for converting hydrological data recorded by the paper hydrological data to queryable database data. The method comprises the following steps: a binary coordinate grid image and a hydrograph image are extracted from the digital image of the paper hydrological data; tilt correction is carried out on the coordinate grid image and the hydrograph image; image enhancement is carried out on the coordinate grid image and the hydrograph image after the tilt correction respectively, and the size of a unit grid is calculated; by using the coordinate grid image and the hydrograph image after enhancement, an hour time intersection set for a grid line and the hydrograph is searched; hydrological data corresponding to the unit grid are calculated; and hydrological data corresponding to the intersections are calculated. The invention also discloses a device for digitizing paper hydrological data. In comparison with the prior art, the method and the device of the invention have the advantages of accuracy and high automatic degree, the hydrological data digitization efficiency can be greatly improved, and the cost is reduced.

The invention provides a water landscape design method enabling flow characteristics of tidal floods rarely happening to reappear scientifically. Actual measurement terrain, geological data and hydrologic data of a natural river course are collected; the range of model, the number of section boards and adopted materials are determined according to a similarity criterion; a lofting section is selected from an actual measurement topographic map, and a model section board the same as a natural riverbed in form is manufactured; a control wire of the model is determined, a model side wall line is designated, a horizontal control network and a vertical control network are made, a bench mark is set, and the model is installed according to a river course topographic map; actual measurement runoff flow hydrographs and river mouth actual measurement tide tide-level hydrographs of dry season typical days and flood typical days of a natural river hydrometric station are verified; flow rates of corresponding sections of a natural riverbed are verified; erosion and deposition verification is carried out on the actual measurement topographic map of the natural river course and the model before and after channel forming discharge occurs; a water circulation system is established, so that water landscapes designed according to the method have extremely high academic value and added economic value.

The invention discloses a method for determining a waterway dredging mud dumping time period on the basis of a sediment loss rate minimum criterion, and relates to a general operation method of an excavator or a dredger, in particular to a method for controlling the mud dumping operation time of a waterway dredging ship by selecting the mud dumping time period according to hydrodynamic data of dredged soil and sediment. The method comprises the following steps that 1, water-sediment movement observation is conducted on the periphery of a mud dumping pit, and on-site test data and tidal data are acquired; 2, the critical starting shear stress and the critical starting flow velocity of the dredged soil and sediment are determined; 3, the hydrodynamic force at the position of the mud dumping pit is calculated, and a flow velocity hydrograph is drawn; 4, the mud dumping time period of the corresponding mud dumping pit is determined on the basis of the sediment loss rate minimum criterion. According to the method, the mud dumping operation time of the waterway dredging ship is controlled by selecting the mud dumping time period in a targeted mode, therefore, the sediment loss rate in the mud dumping process can be decreased by about 30%, the utilization rate of the dredged soil can be increased, and great economic benefits are brought.

The invention relates to a reservoir flood control risk estimation method suitable for climate change. The method comprises the steps of utilizing historical and future data provided by an ASD downscaling model and a global climate model (GCM) to calculate annual precipitation under each GCM historical and future scene; analyzing uncertainty of future rainfall by adopting a Bayesian model weightedaverage (BMA) method and a Monte Carlo sampling method; based on a GAMLSS model, analyzing a covariant relationship between annual precipitation of the reference period and P-III distribution parameters; substituting the precipitation of the future year into the covariant relationship, and analyzing the uncertainty of the design flood caused by the uncertainty of the precipitation of the year; and finally, obtaining a design flood hydrograph group by adopting a same-frequency or same-multiple-ratio amplification method, obtaining the highest flood regulation water level through reservoir flood regulation calculation, calculating the probability that the water level exceeds the design flood level, and obtaining corresponding flood control risk rates in different periods of a future scene.

The invention discloses an instantaneous unit hydrograph electronic model flood early warning machine, which comprises a tilting bucket rain gauge, wherein the tilting bucket rain gauge is connected with a net rain simulation module; the net rain simulation module is connected with an instantaneous unit hydrograph simulation module and a loss simulation module; and the instantaneous unit hydrograph simulation module is connected with a recession simulation module and a river basin output monitoring early warning module. The instantaneous unit hydrograph electronic model flood early warning machine has a simple and compact structure; an early warning judgment basis is an instantaneous unit hydrograph theoretical method; and compared with the conventional interval rainfall strength empirical method, the instantaneous unit hydrograph electronic model flood early warning machine has the advantages of high reliability, high early warning, degree-hour and accuracy, reliability in work, convenience for mounting, operation and maintenance, low energy consumption, long service life and wide application range.

The invention discloses a river ecological risk evaluation method based on an ecological deficit index, and belongs to the field of ecological hydrology, and the IPC classification number is E02B1/00. The evaluation method comprises the steps of obtaining seasonal ecological deficit characters and annual ecological deficit characters according to a hydrological station year-by-year flow hydrograph; and calculating and determining a seasonal ecological deficit threshold value and an annual ecological deficit threshold value for dividing each risk level through trial evaluation, and evaluating seasonal ecological risks and annual ecological risks over the years. According to the method, the limitation of an existing ecological risk evaluation method limited to the monthly time scale is overcome, the assessed time scale is expanded to seasons and years, and method support is provided for river management departments to implement ecological risk management of long-short combination, staging evaluation and graded early warning.

The invention discloses a method for extracting a temperature time hydrograph in a concrete temperature-control optical fiber temperature measuring host. The file format of original temperature data results of temperature monitoring records in the optical fiber temperature measuring host is researched; a corresponding relationship between a rear-time monitoring curve measuring point and an optical fiber practical position in the optical fiber temperature measuring host is built; then a communication relation between a VB module and a temperature data storage file in the host is developed in the optical fiber temperature measuring host; the VB module is developed, a data post-processing module is added into real-time monitoring software of the optical fiber temperature measuring host, and then a processed database file is called; set corresponding controls are triggered, corresponding post-processing database result data is called, and the temperature time hydrograph of any point that technicians want to pay attention to is screened out. The method for extracting the temperature time hydrograph of a target point from the host by means of the VB language is efficient and precise, data is directly screened through a second processing module in the host, and technicians can conveniently check the temperature time hydrograph of any point at any time.

The invention relates to a flow similarity analysis method and device and provides a method for better analyzing hydrological process similarity. The method comprises steps as follows: the reversing times of a first flow hydrograph are determined; fractal dimensions of the first flow hydrograph are calculated; the similarity distance between the first flow hydrograph and a second flow hydrograph is determined according to the reversing times and the fractal dimensions, wherein the similarity distance is used for indicating similarity between the first flow hydrograph and the second flow hydrograph.

The invention discloses a propagation calculation method for designing flood uncertainty in reservoir flood control scheduling, and the method specifically comprises the steps of 1, obtaining an uncertain design flood hydrograph DFH based on a Copula model and in combination with a Bayes theorem; 2, establishing a reservoir flood control scheduling optimization model; and 3, quantifying the uncertainty of the design flood hydrograph DFH by using an information theory method, and performing propagation from the comprehensive DFH obtained in the step 1 to the reservoir flood control scheduling optimization model obtained in the step 2. The method provided by the invention solves the problem of uncertainty of reservoir flood control scheduling caused by uncertainty generated by DFH in the existing method.