CN-121979963-A - Method, medium, equipment and product for determining confluence water quantity in large river and lake regions

CN121979963ACN 121979963 ACN121979963 ACN 121979963ACN-121979963-A

Abstract

The invention provides a method, medium, equipment and product for determining the amount of water converging in a large river and lake region, and relates to the technical field of data fusion and hydrologic information. The method comprises the steps of obtaining remote sensing images, terrains and hydrologic observation data of a target area, establishing a water quantity balance equation, expressing regional confluence water quantity as a function of the change quantity of water storage capacity of rivers and lakes, inlet flow, outlet flow and total flow of main branches (with hydrologic station control), performing spatial discretization on a calculation unit to generate an elevation grid and an initial water level grid, extracting an actual water area based on the remote sensing images, iteratively adjusting the water level grid until convergence conditions are met through comparing the calculated water area and the actual water area, thereby obtaining accurate water storage capacity, and finally substituting the water quantity balance equation to calculate regional confluence water quantity and analyze change characteristics of the regional confluence water quantity. The method integrates multisource data and iterative optimization, improves the accuracy and reliability of water quantity calculation, and is suitable for water resource management and hydrologic analysis of large rivers and lakes.

Inventors

HE ZICAN
JIN ZHONGWU
HUANG LI
LIN HAO
CHEN YIMING
CHEN YUE
LI HUIYUN
QIU WEI
QU GENG
GUO XIAOHU
YAO SHIMING
ZOU YUXIONG
Luan hualong
YUE HONGYAN
WANG LIHUA
WANG HONGYANG

Assignees

长江水利委员会长江科学院

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (10)

1. The method for determining the confluence water quantity in the large river and lake regions is characterized by comprising the following steps of: S1, acquiring remote sensing images and topographic data of a converging region of a target river and lake region, and flow data and water level data observed by a hydrologic station or a water level station; S2, determining a calculation unit of water balance of the river and the lake based on the data acquired in the S1, and establishing a water balance equation of the calculation unit in a set period; s3, expressing the interval confluence water quantity in the water quantity balance equation as a functional relation comprising the stored water quantity variation quantity of the calculating unit, the known inlet flow, the known outlet flow and the total flow of main tributaries; S4, performing space discretization on the computing unit to generate a grid file, and performing altitude Cheng Chazhi on grid nodes based on the terrain data to generate an altitude grid file reflecting the terrain fluctuation; S5, partitioning the computing unit based on water level data, and performing water level interpolation on the grid nodes to generate an initial water level grid file reflecting the water surface morphology; s6, extracting the actual water area and the spatial distribution of the computing unit at the corresponding moment based on the remote sensing image; S7, calculating the initial water storage capacity of the calculation unit and the corresponding calculated water area by using the elevation grid file generated in the S4 and the initial water level grid file generated in the S5; S8, comparing the calculated water area with the extracted actual water area, and iteratively adjusting the water level value in the initial water level grid file generated in the S5 based on the comparison result, and repeatedly executing the S7 until the difference between the calculated water area and the actual water area meets the preset convergence condition, so as to obtain the accurate water storage capacity of the calculation unit at the corresponding moment; s9, substituting the known inlet flow, outlet flow, main tributary total flow and accurate river and lake water storage capacity into the functional relation in S3, calculating to obtain the interval confluence water capacity in the set period, and analyzing the change characteristics of the interval confluence water capacity based on the calculation result.
2. The method of claim 1, wherein in S2, the calculation unit is determined by spatially defining the physical boundary between the inlet and outlet of the river and the inlet and outlet of the river or the water level site corresponding to the inlet and outlet of the river and the outlet of the river, and then, based on the type of the river and the lake, the water balance equation is constructed by distinguishing the water balance equation, wherein the equation is , wherein, Is that The initial water storage volume of the river and lake calculation unit at the moment, Is that Calculating the water storage volume of the unit at the moment, wherein + , Is that Inlet afflux flow of the large river calculation unit at any moment, Is that The outlet outflow flow of the calculation unit of the large river or lake at any time, Is that The equation of the large lake does not contain independent water flow Items, constructed as 。
3. The method for determining the confluent water volume of a large river and lake region according to claim 2, wherein the equation known quantity is determined based on the water volume balance equation established in S2 、、 And Value of Unknown quantity The unknown quantity in the equation is transferred to one side of the equation, wherein The flow observation data on each main tributary is accumulated and acquired; And The values are all directly controlled by the hydrological station, Value of Obtained by calculation in S7 and S8, wherein, The water balance equation for large rivers is converted into: the water balance equation of the large lake is converted into: 。
4. The method for determining the amount of water flowing between large-scale rivers and lakes according to claim 1, wherein the step S4 is characterized in that an elevation grid file is generated, and the process comprises the steps of firstly, performing geometric dispersion on a computing unit determined in the step S2, dividing the computing unit into a plurality of triangular grid units, performing terrain elevation Cheng Chazhi on grid nodes by utilizing a terrain data base Yu Keli gold interpolation method of rivers or lakes, and generating the elevation grid file reflecting the terrain fluctuation of the rivers and lakes Where k is the triangle mesh number, and k1, k2, and k3 respectively correspond to 3 nodes of the triangle mesh.
5. The method for determining the confluence water volume of a large river and lake region according to claim 1, wherein the step S5 is characterized in that an initial water level grid file is generated, the process is that water levels are assigned to a computing unit in different areas based on the position of a hydrological station and the fluctuation characteristics of topography, the water level in each area is high Cheng Chazhi by using linear interpolation in combination with the observed water level of the hydrological station as grid nodes, and the initial water level grid file reflecting the water surface morphology of the river and the lake is generated 。
6. The method for determining the total water flow in a large river and lake region according to claim 1, wherein in step S7, the initial water storage capacity of the calculation unit and the corresponding calculated water area are calculated, and the method comprises the steps of based on an elevation grid file Terrain elevation and initial water level grid file of each grid node in (3) The water surface elevation of the corresponding node in the network is passed through Calculating the water depth value of three vertexes of each triangular mesh at corresponding time one by one, then judging the submerged state of each mesh by taking the water depth larger than zero as a submerged criterion, calculating the area contribution Ak of each submerged triangular mesh, and then carrying out space aggregation on the area contributions of all the submerged meshes according to the following conditions Obtaining the total area of the calculated water area of the calculating unit at the corresponding moment And finally, according to the formula Synthesizing the area of each submerged grid and the water depths of three vertexes of each submerged grid, and calculating to obtain the initial water storage volume of the calculation unit at the corresponding moment Thus, the water volume area cooperative calculation based on the gridding terrain and water level data is completed.
7. The method for determining the confluent water volume of a large river and lake region according to claim 1, wherein in S8, the water area is calculated And the actual water area Space difference area ratio of (2) And then, carrying out cause judgment and water level adjustment on the difference area, namely, the false alarm area Is filled with water In the area without water, determining the calculated water level of the corresponding grid node High, the water level value is reduced by a designated negative step length, and the alarm missing area is Is filled with water In the area without water, determining the calculated water level of the corresponding grid node The water level value is increased by a specified positive step length; and (3) updating the adjusted water level value into an initial water level grid file, taking the updated file as a new input condition, returning to execute S7 to recalculate the stored water storage capacity and calculate the water area, and carrying out loop iteration of the process until the space difference area ratio reaches a preset convergence standard, wherein the stored water storage capacity finally calculated by S7 is the accurate stored water storage capacity of the calculation unit at the corresponding moment.
8. An electronic device comprising a processor and a memory, wherein the memory is configured to store a computer program; The processor is used for loading and executing a computer program so as to enable the electronic equipment to realize the method for determining the confluence water quantity in the large river and lake region according to any one of claims 1 to 7.
9. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements a method for determining a large river and lake region total water flow according to any one of claims 1 to 7.
10. A computer program product comprising a computer program for performing a method of determining the amount of water that merges between a large river and a lake according to any one of claims 1-7 when executed.

Description

Method, medium, equipment and product for determining confluence water quantity in large river and lake regions Technical Field The invention relates to the technical field of data fusion and hydrologic information, in particular to a method, medium, equipment and product for determining the amount of confluence water in a large river and lake region. Background In large river and lake systems, there are typically a large number of inflow sinks of middle and small rivers. Although the interval confluence single-strand flow is limited, the accumulated water quantity also occupies a considerable proportion in the total inflow and confluence quantity due to the large quantity and the dense water system, and is a non-negligible component part in the large-scale river and lake inflow and confluence structure. Taking a large lake as an example, for quantifying the zone confluence water quantity, studies have been generally conducted to calculate the total lake inflow water quantity of the lake by introducing a correction coefficient to the main branch inflow water quantity of the lake, and then reversely pushing the zone confluence water quantity. The coefficient is set depending on theoretical assumption that the periodic balance of the amount of the in-out lake water or the flow area ratio is equivalent to the ratio of the amount of the confluent water. In fact, however, the lake-space confluence and the main tributary total inflow are not in a simple linear relationship in the annual process due to the regional and climate differences, so that the estimation result of the method is limited in accuracy and insufficient in reliability. Disclosure of Invention The invention aims to realize the purpose by adopting the following technical scheme that the method for determining the confluence water quantity in the large river and lake region comprises the following steps: In a first aspect, an embodiment of the present application provides a method for determining a confluence water amount in a large river and lake region, where the method includes: S1, acquiring remote sensing images and topographic data of a converging region of a target river and lake region, and flow data and water level data observed by a hydrologic station or a water level station; S2, determining a calculation unit of water balance of the river and the lake based on the data acquired in the S1, and establishing a water balance equation of the calculation unit in a set period; s3, expressing the interval confluence water quantity in the water quantity balance equation as a functional relation comprising the stored water quantity variation quantity of the calculating unit, the known inlet flow, the known outlet flow and the total flow of main tributaries; S4, performing space discretization on the computing unit to generate a grid file, and performing altitude Cheng Chazhi on grid nodes based on the terrain data to generate an altitude grid file reflecting the terrain fluctuation; S5, partitioning the computing unit based on water level data, and performing water level interpolation on the grid nodes to generate an initial water level grid file reflecting the water surface morphology; s6, extracting the actual water area and the spatial distribution of the computing unit at the corresponding moment based on the remote sensing image; S7, calculating the initial water storage capacity of the calculation unit and the corresponding calculated water area by using the elevation grid file generated in the S4 and the initial water level grid file generated in the S5; S8, comparing the calculated water area with the extracted actual water area, and iteratively adjusting the water level value in the initial water level grid file generated in the S5 based on the comparison result, and repeatedly executing the S7 until the difference between the calculated water area and the actual water area meets the preset convergence condition, so as to obtain the accurate water storage capacity of the calculation unit at the corresponding moment; And S9, substituting the known inlet flow, outlet flow, main tributary total flow and accurate stored water quantity into the functional relation in the S3, calculating to obtain the zone confluence water quantity in the set period, and analyzing the change characteristics of the zone confluence water quantity based on the calculation result. As a further technical solution, S1 further includes: S11, clearly acquiring remote sensing image, topography and hydrologic data, wherein the remote sensing image and the topography data should completely cover the whole target zone, and the hydrologic data should ensure that 1) actual measurement flow data of hydrologic stations at the upstream and downstream of the inflow zone where the river and lake zones converge are ensured ,) 2) For large rivers, at least entering the actual measurement water level data of the upstream and downstream water level stations of the sink region, 3) fo