13 results about "Tributary" patented technology

The invention discloses a river and lake system mutual jacking effect strength identification method and device, equipment and a medium, and relates to the field of jacking effect identification. The method comprises the following steps: according to observation data of a river and lake system, determining an upstream and downstream actual water level difference and an inlet downstream main stream flow when a jacking effect exists; according to the flow and the water level of the upstream main stream of the inlet, the actual water level difference and the water level of the downstream main stream of the inlet, establishing a water level-flow relation of the upstream main stream of the inlet considering the water return influence; according to the flow and the water level of the downstream main stream of the inlet, establishing a water level-flow relation of the downstream main stream of the inlet without water return influence; under the condition of no branch flow convergence, based on the water level-flow relation, the theoretical water level difference under the condition of no jacking effect is calculated; according to the actual water level difference and the theoretical water level difference, a jacking strength index value is calculated; the jacking strength index value is used for representing the mutual jacking action strength of the river and lake system. According to the method, the accuracy and reliability of identifying the mutual jacking action strength of the river and lake system can be improved.

The application relates to the technical field of water resource management, in particular to a hydrological coupling simulation system and method. The method comprises the following steps: collecting long-term flow data of a first tributary and a second tributary in a target reservoir; obtaining the inflow and outflow data of a control reservoir upstream of the first tributary and the second tributary, and calculating the storage influence quantity of the control reservoir; restoring the long-term flow data by using the storage influence quantity to obtain an inflow sequence; calculating the runoff vector component of the inflow sequence to determine the concentration degree representing the runoff concentration degree of the first tributary and the second tributary and the concentration period representing the runoff concentration time; and synchronously quantifying the runoff intra-annual uneven distribution coefficient of the inflow sequence. The application realizes high-precision and evolvable simulation of the runoff process of a basin under the synergistic action of multiple tributaries by introducing vector runoff modeling and dynamic tributary contribution rate adjustment.

The invention discloses a slope downstream stable section flow velocity calculation method, and relates to the technical field of hydraulic engineering, and the method comprises the steps: obtaining slope and upstream and downstream hydraulic index related parameters, the slope and upstream and downstream hydraulic index related parameters comprise a slope gradient, an upstream incoming flow velocity, a slope upstream and downstream river bottom fall, an upstream water depth, a downstream water depth and a downstream position; constructing a downstream stationary section flow velocity function based on related parameters of the slope and upstream and downstream hydraulic indexes; a specific flow velocity calculation formula is obtained based on the downstream stationary section flow velocity function and the downstream position; based on a specific flow velocity calculation formula, a multiple regression analysis method is adopted to obtain the relative flow velocity of a downstream stationary section; and obtaining the flow velocity at the downstream stationary section of the slope based on the downstream stationary section relative flow velocity and the upstream incoming flow velocity. The method for calculating the flow velocity at the slope downstream stable section can effectively improve the accuracy of the flow velocity calculation result and reduce the influence of the downhill gradient on the canal navigation safety, thereby providing a reference for the slope energy dissipation design at the intersection of the main and branch flows.

The application discloses a kind of water diversion project water storage reservoir pollutant reduction amount prediction method and system, comprising the following steps: (1) collecting water source area of water diversion project, water storage reservoir and its main tributary water quality routine monitoring data and different river reach pollutant inflow, water storage reservoir shoreline data, reservoir inflow and outflow;(2) predict water quality condition of water storage reservoir, calculate water storage reservoir pollutant reduction amount;(3) calculate pollutant allowable concentration of main tributary estuary of water storage reservoir and inverse calculate pollutant allowable concentration of different river reaches, calculate the pollutant concentration of different river reaches, determine the land pollutant reduction amount of water storage reservoir and the land pollutant reduction amount of different river reaches of main tributary;(4) calculate water area pollutant reduction amount of water storage reservoir.The present application proposes water-land integrated pollutant reduction method, establishes water quality safety guarantee prediction system of water diversion project water storage reservoir, and provides systematic methodology for regional (basin) pollutant inflow reduction amount calculation.

The invention discloses an intelligent water conservancy monitoring method for sudden water rising of a river in a flood season, and relates to the technical field of water conservancy projects. Analyzing to obtain a floating deviation value of a normal water level; taking a river water part above the reference surface and located in the target monitoring area as a feature part; analyzing to obtain a moving speed and a shape vector of the feature part; establishing a water rising pre-estimation model, and estimating to obtain the peak water level and the peak speed of the target branch; the confluence water level of the target branch in the target branch set after confluence in the target river is obtained through estimation, and the critical water level of rising water of the target river is obtained through analysis. By classifying the target branch according to the water rising relevance, forming the floating deviation value and estimating the peak water level and the peak speed of the target branch, the confluence water level after confluence in the target river can be predicted according to the obtained parameters, and therefore the scale of the water rising situation which does not occur yet can be predicted.

The present application relates to the technical field of image data processing, in particular to a water conservancy engineering four-prediction system based on a runoff-confluence model-flood evolution model coupling, the corresponding steps of the system comprising: determining the correlation degree of fluctuation of a monitoring position by using the change information of the monitoring data of the tributaries in a basin, and determining the dangerous contribution degree of the tributaries by using the respective correlation degrees of adjacent monitoring positions; traversing each tributary in the basin, taking the last tributary as a starting point, and determining the dangerous contribution distribution amount of the remaining tributaries connected to the starting point by using the dangerous contribution degree of the starting point; taking the tributary with the maximum dangerous contribution distribution amount corresponding to the starting point as the starting point, and iteratively obtaining the significant fluctuation tributary sequence of the starting point; determining the current event abnormality degree by using each dangerous contribution distribution amount in the sequence, thereby updating the coupling model. Through the technical scheme of the present application, the accuracy and timeliness of water conservancy abnormal four-prediction are improved, and the perception and resistance of water conservancy projects to flood events are effectively improved.

This invention discloses a method for determining the true source of a river, belonging to the field of hydrological science and technology. The method includes: acquiring the three-dimensional skeleton lines of the main stream and tributaries of the river to be determined; determining a set of candidate tributaries at the distal end; quantifying the water volume contribution of each tributary to determine a set of candidate tributaries based on water volume; determining a set of candidate tributaries based on the straightness of the flow direction of each tributary; determining a set of candidate tributaries based on altitude advantage; obtaining the final candidate set; collecting existing river data for determining true sources; using the analytic hierarchy process (AHP) to obtain the weights of distance, water volume contribution, straightness of flow direction, and altitude advantage; calculating the probability of each tributary in the final candidate set being the true source based on the weights of these factors; and selecting the tributary with the highest probability of being the true source as the true source of the river to be determined. This invention solves the problem of existing technologies relying too heavily on subjective judgment of river sources.

Disclosed is a method for regulating confluence of tributaries with a large drop difference and a large angle into a trunk canal. The method includes: banking up a reservoir at an upstream end of a tributary river, and widening a water surface, such that uniform distribution of water flows is completed; then conducting scouring and energy dissipation to reduce a flow velocity and kinetic energy of the water flows; then conducting flow-slowing sedimentation, such that sediment is deposited on one side of the tributary river connected to a downstream side of a trunk stream; and then conducting flow diversion at one side of the tributary river connected to an upstream side of the trunk stream, such that an included angle of confluence of tributary river water into the trunk stream is reduced.

The invention discloses a method and a system for quickly identifying branch reverse flow under hydraulic jacking change of a main and branch river channel. According to a flow formula at the two ends of the tributary river channel, the relation between the flow Q1 of the main stream end of the tributary river channel and the water level of the main stream end of the tributary river channel is obtained, and when the minimum value and the maximum value are taken, two planes Q1 = f (,) are obtained; obtaining the relationship between the flow Q2 of the end, close to the lake, of the tributary channel and the water level, close to the lake, of the tributary channel, and when the minimum value and the maximum value are taken, obtaining two planes Q2 = f (,); drawing the plane and a region between the planes in a coordinate system to obtain a hydraulic partition map; finding out the value range corresponding to Q1 < 0 in the graph, namely the value range of countercurrent occurring at the end, close to the main stream, of the tributary river channel; finding out the value range corresponding to the fact that Q2 is smaller than 0, namely the value range of countercurrent occurring at the end, close to the lake, of the tributary river channel; if Q1 is smaller than 0 and Q2 is smaller than 0, a value range overlapping region is found out, that is, long-distance countercurrent from the lake end to the main stream end occurs, and convenient, accurate and rapid anticipation of countercurrent is achieved.

This invention provides a method for preventing flash floods based on flow control, including determining the maximum allowable flow rate of a river section, the maximum allowable discharge flow rate of each tributary, the design flow process of the tributaries, and the method for regulating water volume. Based on the above information, it also presents the design concept for the orifice size of the control dam used in this measure. Compared with the current common method of simply raising the levee standards of urban river sections to resist flash floods, this method only changes the flow process when the flood flow exceeds the design standard, without changing the flow process of the tributaries at other times, thus avoiding long-term inundation; it only requires the construction of the dam body, without the need for gates or other control facilities, resulting in low investment; it eliminates operational scheduling issues, effectively reducing urban flash flood losses and achieving high overall benefits; after the flood, only possible debris such as branches need to be cleared to prevent orifice blockage, resulting in low maintenance costs. This method is beneficial for the development of flash flood prevention work in mountainous towns, enabling more effective resistance to flash floods and prevention of urban flooding.

A method for identifying the change trend and cause of the flood level of a river section with multiple tributaries downstream of a dam, comprising determining the average relationship and amplitude of the water level data and flow data above the n-year flat-plate flow of the target river section before the dam is built, counting the average and extreme situations of the tributary inflow in the main flood season of the main stream, collecting the terrain data of the target river section, establishing a one-dimensional unsteady flow hydrodynamic mathematical model, evaluating the change trend of the river discharge capacity downstream of the dam according to the one-dimensional unsteady flow hydrodynamic mathematical model, and quantitatively analyzing the influence of each factor on the flood level of the river section with multiple tributaries downstream of the dam. The method provided by the present application can accurately identify the change trend of the flood level and effectively separate the influence of single factors by means of statistical analysis and one-dimensional unsteady flow hydrodynamic mathematical model, processing and calculation of observation data, simple process, small numerical calculation workload, and high reliability.

The application discloses an intelligent water conservancy monitoring method for sudden flood rise of a river in a flood season, and relates to the technical field of water conservancy projects, which comprises the following steps: obtaining at least one target tributary set; analyzing a floating deviation value of a normal water level; regarding a part of river water above a reference surface and located in a target monitoring area as a characteristic part; analyzing a moving speed and a shape vector of the characteristic part; establishing a flood rise estimation model to estimate a peak water level and a peak speed of the target tributary; estimating a confluence water level of the target tributary in the target river after confluence, and analyzing a critical water level of the target river in the flood rise. Through the classification of the target tributary according to the correlation of the flood rise, the formation of the floating deviation value, and the estimation of the peak water level and the peak speed of the target tributary, the confluence water level after confluence in the target river can be predicted according to the obtained parameters, so that the scale of the flood rise that has not yet appeared can be predicted.

This utility model relates to the field of water conservancy engineering technology, specifically to a water conservancy hub structure, including an upstream reservoir and a downstream river channel. The upstream reservoir and the downstream river channel are connected by an intermediate channel, which includes a first tributary channel and a second tributary channel. The upstream of the first tributary channel and the upstream of the second tributary channel are connected to form a diversion point. The downstream of the first tributary channel flows into the downstream river channel. A ship lift is located at the confluence between the first tributary channel and the downstream river channel. A water-retaining overflow dam is located downstream of the second tributary channel. This utility model designs the intermediate channel as two tributary channels to divert water flow, with the upstream of the two tributary channels connected to form a diversion point. Water can flow into the two tributary channels separately. When passing through the diversion point, the flow velocity and impact force are reduced by the second tributary channel and the water-retaining overflow dam, greatly reducing the impact of the water flow on the ship lift and ensuring the normal operation of the ship lift and the normal navigation of the waterway.