40 results about "Tidal river" patented technology

The invention provides a tidal reach water level prediction method, device, equipment and medium, and the prediction method comprises the following steps: collecting historical data and current time period data, the historical data and the current time period data comprising actually measured runoff data, actually measured water level data and actually measured tidal range data; lagging adjustment is conducted on the actually measured runoff data and the actually measured tidal range data with the actually measured water level data as the benchmark through a cross-correlation analysis method; performing EEMD decomposition to obtain respective intrinsic mode functions and residual errors; and outputting the eigenmode function of the water level data of the analysis station in the future time period and the predicted value of the residual error through the LSTM model, and carrying out superposition to obtain the predicted value of the water level of the tidal reach. According to the method, the water level data, the runoff data and the tidal range data of the tidal reach are subjected to conjoint analysis, the problems of nonlinear signal processing and low precision of the water level of the tidal reach are effectively solved through EEMD decomposition and the LSTM model, and the prediction accuracy of the water level of the tidal reach is greatly improved.

The application discloses a kind of multi-step flow prediction methods based on space-time dual attention long short-term memory network, belong to deep learning and water conservancy informatization technical field.The method includes: feature perception and data preprocessing, variable attention feature screening, LSTM time series dynamics coding, extract time series deep dependence and construct full-time domain dynamics memory bank;Dynamic retrieval and multi-dimensional feature fusion, introduce step condition embedding and time decay driven cross attention mechanism to realize on-demand retrieval of historical features, and fuse near-time physical evolution inertia to ensure trajectory continuity;Result mapping and trajectory output, generate multi-step flow prediction value in parallel.The application solves the problems of spatial driving weight static, phase lag, memory loss and trajectory discontinuity in tidal river network multi-step flow prediction, and improves the prediction accuracy and stability.

The present invention discloses a method for hydrodynamic reconstruction of a tidal river network based on a Tesla valve in a planar and vertical combination. The method comprises the following steps: first, in the planar form of the river channel, the main upstream seawater channel in the tidal river network is designed into a structural form of a Tesla valve; second, in the vertical direction of the river channel, a Tesla valve-like structure is also adopted, and a directional guide structure is set near the riverbed, so that the streamline is smooth when the water flows toward the ocean, and the water flow resistance is increased when the water flows upstream from the ocean to the river channel; the present invention achieves effective suppression of the upstream salt tide by installing a structure similar to a Tesla valve at the inflow and upstream between the ocean and the river channel without using movable components such as gates, while not cutting off the connectivity of the water body, having little impact on fish migration and the connectivity of the ecosystem, and more effectively blocking the high-concentration salt water body at the bottom, thereby promoting the unidirectional flow of water and the discharge of pollutants in the river channel of the tidal river network area.

This invention discloses a river flow monitoring system and method based on ultra-high frequency side-scan radar. The data acquisition module is deployed on the riverbank to acquire multi-channel raw echo data required for river hydrological parameter inversion. The river flow monitoring cloud platform processes, analyzes, displays, and stores the data acquired by the data acquisition module, and sends corresponding instructions to the data acquisition module. This solution uses a database to correlate and store hydrological data, meteorological data, cross-sectional geometric data, and comparative measurement data in a time series manner, providing a solid data foundation for in-depth data mining, model optimization, and trend prediction. Furthermore, the data analysis considers the impact of complex tidal dynamic modulation in tidal river sections on river flow calculation. A tidal phase correction term is introduced into the index velocity method model, effectively eliminating the systematic bias caused by tidal dynamic modulation in the calculation.

The application discloses a kind of tidal river network sluice operation data model processing method, system and terminal, it is related to sluice operation analysis technical field, and its technical scheme main points are: initial outer river tidal level is carried out noise reduction pretreatment, and sliding average is carried out;Select the smooth result of the highest matching degree of rising and falling tide trend, and carry out abnormal fluctuation elimination processing;The rising and falling tide trend in standard smooth result is analyzed;Rising and falling tide trend result and water level difference threshold are loaded in Infoworks RTC module;Different water level difference threshold is tried, and the optimal water level difference threshold of sluice opening and closing is determined, to obtain final Infoworks RTC module.The application is carried out to the smooth processing of outer river tidal level data, and the outer river tidal drop process is judged, according to the inner and outer river tidal difference to control the opening and closing of sluice, reach water quality model operation working condition and actual engineering working condition consistent, provide strong support for later water power water quality model rating.

The invention discloses a method for judging a backflow time period of a gate in a plain tidal river network. The method comprises the following steps: acquiring water gate upstream and downstream long-series observation water level, drainage basin rainfall and wind field data; astronomical tide and rainfall runoff decoupling is carried out on the downstream section water level, dynamic deformation characteristic parameters are extracted and corrected, and a downstream water level forecasting curve set is obtained; physically decomposing the observation water level of the upstream shallow lake, extracting the average water level and the wind-generated water level deviation, and calculating an upstream forecast curve set in combination with rainfall; combining the forecast curve set to construct a predicted water level difference sequence set; extracting a prediction error quantile based on a pre-constructed error condition distribution library, and performing lower bound calibration and minimum extraction on the difference sequence to obtain a partial safety fusion water level difference sequence; a backflow risk period is identified based on the fused sequence and a decision threshold. According to the method, time consumption of complex numerical solution is avoided, and timeliness and robustness of advanced early warning in the backflow risk time period are improved.

This invention relates to a collision avoidance decision-making method for vessels in tidal inland waterways, belonging to the field of vessel collision avoidance technology. The method includes: acquiring tidal information and vessel navigation information of the tidal inland waterway, wherein the vessel navigation information includes the navigation information of the vessel itself and a target vessel with a collision risk; determining the encounter situation between the vessel and the target vessel based on the vessel navigation information; determining the current direction of the vessel and the target vessel based on the encounter situation and the tidal information; determining the vessel's collision avoidance responsibility based on the encounter situation and the current direction; and making a collision avoidance decision for the vessel based on its collision avoidance responsibility. This invention considers the tidal problem in tidal inland waterways, divides the collision avoidance responsibility of vessels in different encounter situations, and thereby provides reasonable collision avoidance schemes, achieving effective collision avoidance decision-making tailored to the characteristics of tidal inland waterways.

The application discloses a kind of quantitative tidal river section pollutant flux analysis method, comprising the following steps: S1, the equation of concentration variation of pollutant is established;S2, the water flux equation of river section at the time period to be studied is established;S3, based on water flux equation and the equation of concentration variation of pollutant at the section, the pollutant flux equation of river section at the time period to be studied is established;According to the pollutant flux equation, the hourly flux of pollutant at the section at the time period to be studied is calculated.The application can calculate the hourly variation process of pollutant concentration which sufficiently reflects the concentration oscillation caused by reciprocating flow by inputting tidal level and limited concentration data into the equation of concentration variation of pollutant, and based on the hourly variation data of pollutant concentration, the pollutant flux at the section at a certain time period in the future can be calculated hourly according to the pollutant flux equation, and finally the total pollutant flux at the section per day can be counted, which provides scientific support for water safety decision-making of city managers.

The invention discloses an urban drainage and waterlogging prevention system treatment engineering system scheme library construction method, which comprises the following three main steps of: firstly, carrying out current situation and problem evaluation on an urban drainage and waterlogging prevention system, and drawing up an evaluation index system of the urban drainage and waterlogging prevention system containing 19 indexes; four types of typical cities including mountainous regions, hills, plain river networks and tidal river networks are selected for investigation, and problems are accurately evaluated; secondly, on the basis of landform and hydrological characteristics, an urban drainage and waterlogging prevention system treatment engineering system scheme library is constructed, and three drainage system treatment schemes of'source, small drainage and large drainage 'and a standard exceeding emergency scheme are provided for each type of cities; and finally, making a specific treatment scheme according to the processes of current situation evaluation, treatment standard determination, drainage partition optimization and the like. The drainage and waterlogging prevention capacities of different types of cities are effectively improved, losses caused by waterlogging are remarkably reduced, and safe operation of the cities and life and property safety of residents are guaranteed.

The invention discloses an ultra-shallow tidal river reach bottom friction coefficient confirmation system and method and related equipment, according to the scheme, through innovatively improving a Zeer-Manning formula and carrying out quantitative assignment on a Manning roughness coefficient according to different water depth intervals, accurate calculation and determination of the bottom friction coefficient are realized, and the accuracy of the bottom friction coefficient is improved. And the accuracy and applicability of the calculation result are improved.

The application discloses a kind of tidal river reach water level discharge relation analysis method based on tidal harmonic analysis, including collecting the measured water level data of research tidal river reach hydrological site, river basin river terrain and digital elevation data;Based on tidal harmonic analysis, the characteristic parameters of each tidal component of tidal river reach tidal level and the variation characteristics of water surface elevation are obtained, and then the independent tidal flow and river runoff flow are obtained;Establish one-dimensional hydrodynamic model of tidal river reach, analyze the flow variation process and water level discharge variation relation under different water level variation scenarios;The contribution degree of tidal flow and river runoff to actual flow size and variation process is analyzed using multiple regression analysis and path analysis method, and the variation characteristics of water level discharge relation of tidal river reach are obtained.The advantage is: the water level discharge relation of tidal river reach can be quickly analyzed, without complex estuary hydrodynamic process simulation, and it is also applicable when lacking measured flow data.

The application provides a tidal river reach water level prediction method, device, equipment and medium, wherein the prediction method comprises the following steps: collecting historical data and current period data, the historical data and the current period data both comprise measured runoff data, measured water level data and measured tidal range data; using cross-correlation analysis method to adjust the measured runoff data and the measured tidal range data with the measured water level data as the benchmark; performing EEMD decomposition to obtain respective intrinsic mode functions and residuals; outputting the prediction values of the intrinsic mode functions and the residuals of the water level data of the analysis station in the future period through the LSTM model and superimposing them to obtain the prediction value of the water level of the tidal river reach. The application carries out joint analysis on the water level data, runoff data and tidal range data of the tidal river reach, effectively solves the nonlinear signal processing problem and the low precision problem of the water level of the tidal river reach through EEMD decomposition and the LSTM model, and greatly improves the prediction accuracy of the water level of the tidal river reach.

The invention provides a method for evaluating the risk of combined pollution of micro-plastics and sea salt in a tidal basin to an ecological environment by using myriophyllum spicatum, and the method comprises the following steps: simulating a tidal section water body which comprises polystyrene micro-plastics and a sea salt solution; the method comprises the following steps: selecting myriophyllum spicatum as a test plant, pretreating the myriophyllum spicatum, transplanting the myriophyllum spicatum into a water body of a tidal section, and carrying out composite stress culture; sampling after culture is finished, measuring physiological and biochemical indexes of the myriophyllum spicatum, and evaluating the risk of combined pollution to the aquatic ecosystem. The method is suitable for a tidal basin which is a special transition zone where fresh water intersects with the ocean, can accurately identify the degree of harm of micro-plastic and sea salt combined pollution to an aquatic ecosystem, and provides technical support for combined pollution ecological risk management and control.

The application discloses a tidal river tidal water intake threshold value determination method in the technical field of river regulation, carries out the collection and analysis of basic data such as hydrology, topography, water quality, pollutants and salinity of a river and an outer sea, determines a river control section and water quality improvement targets and salinity control targets, establishes a tidal river hydrodynamic water quality mathematical model, simulates and calculates hydrodynamic water quality results under different engineering regulation schemes, and counts tidal water intake Q, water quality concentration C and salinity P of the river control section under different regulation schemes. According to the tidal river tidal water intake threshold value determination method, the reasonable tidal water intake for improving the water environment of the tidal river by using tidal resources can be determined, key technical support for determining the tidal river engineering regulation task and scale is provided, and the problem that the increase of the tidal water intake causes the invasion of salt water and affects the safety of production and living water is avoided.

This invention provides a method and apparatus for recommending port entry and exit in tidal river sections based on ship fuel consumption. It only considers the impact of tidal currents on the actual speed of ships. Specifically, it quantitatively analyzes tidal currents through predicted tides and directly analyzes the actual speed of ships during navigation by combining the tides and the water flow speed they affect. It calculates and accumulates fuel consumption using existing and relatively accurate relationships between speed and fuel consumption to estimate the fuel consumption of the entire route. This allows for the recommendation of time windows for construction ships to enter and exit ports, selecting time windows with lower fuel consumption to optimize fuel consumption for construction ships in tidal river sections, thereby achieving the goals of energy conservation, emission reduction, and reduced navigation costs.

The application discloses a kind of tidal river network water gate group multi-objective intelligent water power regulation methods, steps are as follows: S1, obtains tidal river network historical detection data and hydrological data.S2, construct river network flow prediction model, water level prediction model, obtain river network key section hydrodynamic data.S3, based on multi-objective optimization idea, with water power regulation as the core target function, flow prediction model and water level prediction model are nested into improved optimization algorithm.S4, according to the multi-objective demand such as river network flood control, water resources, water environment and water ecology, based on optimization algorithm, the optimal gate opening is solved, and real-time dynamic water gate group joint regulation scheme is generated.The application combines optimization scheduling method and machine learning technology, proposes a tidal river network water gate group multi-objective intelligent water power regulation method, which can generate water gate group joint regulation scheme in real time, significantly enhance the flowability and self-purification capacity of river network water body, and provide important support for the systematic governance and intelligent management of tidal river network water problems.

The present application relates to the technical field of power system disaster prevention and reduction, and particularly relates to a power distribution facility risk management and control scheduling method and system based on urban flood forecasting. The method comprises the following steps: collecting multi-source static basic data of a target area, and constructing a flood risk ledger of power distribution facilities; integrating urban flood disaster-causing factors, coupling to form a flood forecasting mechanism model, and outputting a risk level; constructing a deep learning model, rolling forecasting short-term flood scenarios, and generating risk prediction results; obtaining Internet of Things monitoring data, identifying the water accumulation state of power distribution facilities, and forming facility monitoring results; using the risk prediction results and facility monitoring results to construct a risk list, and designing a scheduling scheme based on the risk list; mapping the scheduling scheme into scheduling instructions, and uploading to the management and control platform. The present application can effectively improve the disaster prevention and reduction level of power distribution facilities under extreme climate conditions, and provide technical support for the safe operation of power grids in typical tidal river network areas.

This invention provides a method, apparatus, and electronic equipment for analyzing water quality compliance in tidal river networks, relating to the field of water environment data processing technology. It divides the target area into multiple independent sub-regions based on hydrodynamic characteristics and topographic structure. Then, combining the pollution load structure entering the river, it determines the baseline pollution carrying capacity of each sub-region during the slack tide period. Furthermore, using tidal rhythm as the core, it quantifies the bidirectional mass flux between sub-regions under the tidal rhythm, and determines the effective environmental capacity value for each. This allows for precise capture of the dynamic impact of tidal reciprocating flow on pollutant migration and diffusion, achieving a refined characterization of the hydrological-hydrodynamic-water quality coupling process. Furthermore, it constructs an environmental capacity map, which can intuitively present the spatiotemporal dynamic distribution of capacity, completely breaking through the limitations of traditional static capacity calculation. Water quality compliance analysis based on the map can provide precise spatiotemporal implementation guidance for treatment projects, avoiding one-size-fits-all treatment and significantly improving the effectiveness of engineering applications.

The invention relates to the technical field of disaster prevention and reduction of power systems, in particular to a power distribution facility risk management and control scheduling method and system based on urban flood forecast. The method comprises the following steps: collecting multi-source static basic data of a target area, and constructing a flood risk ledger of the power distribution facility; integrating the urban flood disaster-inducing factors, coupling to form a flood forecasting mechanism model, and outputting a risk level; constructing a deep learning model, performing rolling prediction on a short-time flood scene, and generating a risk prediction result; internet-of-things monitoring data are acquired, the power distribution facility ponding state is identified, and a facility monitoring result is formed; constructing a risk list by using the risk prediction result and the facility monitoring result, and designing a scheduling scheme based on the risk list; and mapping the scheduling scheme into a scheduling instruction, and uploading the scheduling instruction to a management and control platform. According to the invention, the disaster prevention and reduction level of power distribution facilities under extreme climate conditions can be effectively improved, and technical support is provided for safe operation of a power grid in a tidal river network typical area.

The utility model discloses a simple artificial fish habitat system suitable for a tidal river channel, which is characterized in that a pit is arranged on a riverbed of the tidal river channel as a main body, and a water inlet and a water outlet of the pit are respectively provided with a stepped retaining dam; compacting the bottoms of the pits, laying clay on the bottoms and side walls of the pits, and arranging natural stones on the surfaces of the clay; a water area corresponding to the bottom of the pit is a deep water area for planting submerged plants; the water area corresponding to the side wall of the pit is a shallow water area, and shallow water plants are planted; the cement block stone wall of the stepped retaining dam is vertically inserted into a riverbed to be fixed and is higher than the riverbed; the natural stones are arranged at the top end and on the two sides of the cement block stone wall, and the gravel is arranged between the natural stones. The device can effectively capture and store water during water recession, and ensures that aquatic organisms have enough inhabiting space during tidal variation.

The application discloses a kind of lateral water intake rectifying device for tidal river section, the rectifying device is arranged in the lateral water intake position of river channel, the rectifying device includes: flow guide wall, the flow guide wall is arranged at water intake in vertical direction;Rotary mechanism, the rotary mechanism is installed in the bottom of flow guide wall, so that flow guide wall can rotate around axis line;Control system, the control system is connected with rotary mechanism, for controlling rotary mechanism, adjust the rotation angle and direction of flow guide wall, the present application improves the existing lateral water intake rectifying device, so that it can adjust the best water direction in situ according to the different direction of water flow, so as to realize the all-weather stable lateral water intake under tidal river section, by adopting this movable rectifying device, can effectively according to the water flow change of tidal river section, and provide more stable and uniform water intake condition.This has important significance for water resources management and river governance, help to improve water intake efficiency and the protection of water intake structure.

Use: The utility model relates to the field of energy, in particular to renewable energy sources, and can find application in the combined use of solar energy and the water inflows of small rivers. Objective: To amplify the DC power generated by photovoltaic converters and simplify the generator design, with photovoltaic converters being installed near tidal rivers where the energy of the water flow can be used as primary mechanical energy for amplification. The essence of the utility model: A device for hydraulic amplification of direct current power generated by photoelectric converters, supplied to the excitation winding of a direct current generator of a transverse current field, i.e., an amplifier, receives primary mechanical energy from the kinetic energy of the water flow.

The present application relates to the field of ecological revetment in the field of hydraulic engineering, and particularly relates to a riprapping ecological revetment system suitable for water level drawdown. The system comprises an ecological soil base layer, a filter layer, a riprapping revetment, a simulated wood pile scour protection belt and a planting groove; the ecological soil base layer has a compaction degree of greater than or equal to 93%, providing a dense support; the filter layer ensures smooth seepage and prevents soil loss; the riprapping revetment is formed by stacking large-diameter block stones according to gradation, forming a rigid skeleton resistant to scour; the planting groove is fixed in the riprapping structure, providing space for vegetation and anchoring the surface riprapping. The present application forms a closed-loop protection system through the cooperation of the five, effectively solving the problems of traditional riprapping revetment, such as easy scouring and instability during water level drawdown, and high maintenance cost, and has the advantages of scour resistance, ecology and universality, and is suitable for water level rapid rise and fall scenes such as regulating and storing lakes, reservoir drawdown zones, tidal river shorelines and the like.

The present application relates to the technical field of tidal river flow determination, and particularly relates to a tidal river flow determination method and device. Initial flow corresponding to each to-be-measured point in a target section of a tidal river is obtained. Water temperature data, salinity data and depth data corresponding to each to-be-measured point are obtained. The initial flow corresponding to each to-be-measured point is corrected based on the water temperature data, the salinity data and the depth data, so as to obtain target flow corresponding to each to-be-measured point in the target section. Through point-by-point correction, it is ensured that the flow data of each to-be-measured point in the target section is adapted to the local environment where the to-be-measured point is located, and the finally summarized total flow of the section can more truly reflect the hydrodynamic characteristics of the tidal river, thereby providing high-precision data support for flood control scheduling, water resource management and the like.

The invention relates to a method for determining the dredge amount of a radial tidal reach based on the principle of treating river according to river. The method comprises the steps of screening a dredge area according to river reach erosion and deposition changes, and drawing up a dredging range and a dredging elevation; establishing a river reach two-dimensional water-sediment mathematical model, simulating branch channel split ratio change after dredging of a plurality of dredging areas and back-silting amount after N years of dredging, and calculating a back-silting rate; when the split ratio changes or the back-silting rate does not meet the requirement, firstly removing the dredged areas with the back-silting rate not meeting the requirement, re-simulating branch split ratio change for the remaining dredged areas, and adjusting the dredging range or the dredging elevation of the adjusting area by taking the ratio of the split ratio change threshold value to the current split ratio change as the adjusting step length, so as to adjust the dredging range or the dredging elevation of the adjusting area. And obtaining dredging parameters of each dredging area which enables the split ratio of the branch channels to meet the requirement. The method provided by the invention can scientifically and reasonably determine the range and elevation of the dredged sand in the radial tidal reach, and provides a rapid, simple and convenient determination method for determining the dredged sand amount in the radial tidal reach.

The present application relates to a kind of ecological flow evaluation method for tidal river network migration channel maintenance of fishery, utilize river network data to build one-dimensional tidal river network hydrodynamic model;Set different water inflow and tidal conditions scenarios, input one-dimensional tidal river network hydrodynamic model, output river network each river flow velocity;Obtain the flow velocity suitability curve of target fish, the flow velocity suitability curve of each river of river network is substituted, and suitable migration river is obtained;According to river network flow direction, the water system flow between suitable migration river is calculated;With water system connectivity as weight, the total length of adjusted suitable migration river is calculated;According to the mapping relationship between adjusted suitable migration river total length and water inflow, determine fish migration ecological flow.The present application solves the prior art to ecological flow only considers the longest total length of suitable migration river of fishery and does not consider the connectivity between river, falls into local optimum problem and leads to difficult to meet the needs of fish migration.

The invention relates to the technical field of engineering simulation, and discloses a tidal river reach lake and reservoir global hydraulic retention time spatial distribution calculation method and device, and the method comprises the steps: employing a weir flow formula and a scheduling operation scheme, combining an out-of-sluice tide level curve and a lake and reservoir capacity curve, and carrying out the adjustment and calculation to obtain the hourly flow of a water diversion sluice and a drainage sluice; the method comprises the following steps: dividing a lake and reservoir into a plurality of grid units by utilizing topographic data of a to-be-researched tidal river reach lake and reservoir, and constructing a lake and reservoir three-dimensional numerical model by taking hourly flow of a drainage sluice and a water diversion sluice as calculation boundaries; a tracking substance is arranged at the water diversion gate, and the tracking substance concentration of each grid unit of each time step is obtained in a model simulation mode; then, the hydraulic retention time of each grid unit is obtained through the judgment conditions and a hydraulic retention time calculation formula; isolines are constructed for the same hydraulic retention time of different grid units, hydraulic retention time space distribution of the whole domain of the lake and the reservoir is determined, and the purpose of accurately obtaining the key area of water retention in the lake and the reservoir is achieved.

The present application relates to the technical field of river basin management, and discloses a sewage system management and scheduling method for river basin management, comprising the following steps: predicting tides and dividing tide phase intervals; calculating tide phase-dependent pollutant capacity; predicting rainfall and calculating pollutant flux; calculating tide phase-dependent emptying rate; predicting volume occupation and judging the sufficiency of drainage volume; optimizing time sequence coupling volume division; generating scheduling instructions; correcting real-time data and updating scheduling. The present application solves the problem that the tidal river basin cannot effectively balance water quality protection and waterlogging prevention in the regulation and storage pool, and realizes the collaborative optimization of dual-function volume division and discharge scheduling of the regulation and storage pool.

The application discloses a propeller photoelectric current speed meter for tidal flow measurement, which comprises a speed meter controller, a measuring rod and a propeller head connected in sequence, and the propeller head is matched with a slidable and rotatable propeller through a probe; the speed meter can quickly judge the flow speed of tidal river mouth and the forward and reverse flow directions; the flow speed is judged by the rotating speed of the propeller; the forward and reverse directions of tidal flow are judged by the cooperation of the propeller at different positions of the propeller shaft and the probe, or the direction of tidal flow is judged by the color of light waves reflected by the reflective coating of the propeller; the propeller is divided into three sections, one end of which is provided with a first reflective coating, the other end is provided with a second reflective coating, and the middle section is not provided with a reflective coating; when the probe is located at one end of the first reflective coating, it indicates that the tide is in the forward direction; and when the probe is located at one end of the second reflective coating, it indicates that the tide is in the reverse direction; the speed meter has the advantages of simple structure, convenient operation, high measurement precision and high data reliability.

The invention provides a tidal river network water quality standard analysis method and device and electronic equipment, and relates to the technical field of water environment data processing, a target area is divided into a plurality of independent sub-areas according to hydrodynamic characteristics and a topographic structure, and then the reference assimilative capacity of each sub-area in a flat tide period is determined by combining an in-river pollution load structure; furthermore, the tidal rhythm is taken as a core, the bidirectional material flux between the sub-regions under the tidal rhythm is quantified, the respective effective environment capacity value is determined on the basis, the dynamic influence of the tidal reciprocating flow on the migration and diffusion of pollutants can be accurately captured, and the refined description of the hydrology-hydrodynamic force-water quality coupling process is realized. An environment capacity map is further constructed, space-time dynamic distribution of capacity can be visually presented, and the limitation of traditional static capacity calculation is thoroughly broken through. The water quality standard-reaching analysis based on the map can provide time-space accurate implementation guidance for the treatment project, avoids one-step treatment, and significantly improves the engineering application effect.