CN-121981020-A - Seawater pond culture environment regulation and control method and system based on tail water monitoring

CN121981020ACN 121981020 ACN121981020 ACN 121981020ACN-121981020-A

Abstract

The invention discloses a seawater pond culture environment regulation and control method and system based on tail water monitoring. By acquiring the water quality time sequence and the three-dimensional structure of the pond, a hydrodynamic force-water quality coupling simulation field is constructed to identify the pollutant diffusion path and the water quality delay relation between tail water and the cultivation area. Based on the method, the future water quality change of each area of the pond can be predicted by combining tail water monitoring data. And (3) identifying the water mass load accumulation area and the self-cleaning active area by carrying out cluster analysis on the prediction result. Accordingly, a zoned and accurate environment regulation strategy is formulated. The invention realizes scientific prediction and partition management of the water quality change of the seawater pond and provides technical support for efficient and accurate cultivation environment regulation.

Inventors

SUN ZHIWEI
HU XIAOJUAN
CAO YUCHENG
XU YU
WEN GUOLIANG
SU HAOCHANG
XU WUJIE
ZHANG LONG
LONG YUMING

Assignees

中国水产科学研究院南海水产研究所
南方海洋科学与工程广东省实验室(珠海)
三亚热带水产研究院

Dates

Publication Date: 20260505
Application Date: 20260407

Claims (7)

1. The seawater pond culture environment regulation and control method based on tail water monitoring is characterized by comprising the following steps of: Acquiring water quality parameter time sequence data of tail water discharge points, water supplementing points and water quality monitoring points of a cultivation area of a target seawater pond, and constructing a hydrodynamic-water quality coupling simulation field by combining pond three-dimensional structure data; Identifying a diffusion path of each pollutant in the pond according to the hydrodynamic force-water quality coupling simulation field, performing correlation analysis on the diffusion path of the pollutant and the time sequence data of the tail water quality parameters, and determining a water quality parameter delay relation between the tail water quality and the water quality of a pond culture area; Monitoring tail water in a preset time period of the target seawater pond, and predicting water quality change information in the preset time period of each area in the target seawater pond according to the diffusion path and water quality parameter delay relation of each pollutant; clustering the water quality change information in a preset time period of each area, and identifying a water quality load accumulation area and a water quality self-cleaning active area in the target seawater pond; and analyzing the water quality load accumulation area and the water quality self-cleaning active area according to the water quality change information, and determining a target seawater pond culture environment regulation strategy.
2. The seawater pond culture environment regulation and control method based on tail water monitoring according to claim 1, wherein the acquiring of the water quality parameter time sequence data of the tail water discharge point, the water supplementing point and each water quality monitoring point of the culture area of the target seawater pond is combined with the three-dimensional structure data of the pond to construct a hydrodynamic-water quality coupling simulation field, specifically comprising the following steps: Acquiring a water quality parameter sequence of a plurality of water quality sensors which are arranged in advance in a preset time period acquired by tail water discharge points, water supplementing points and monitoring points in a culture area, wherein the water quality parameter sequence at least comprises dissolved oxygen, ammonia nitrogen, nitrite, pH value, salinity, turbidity and chlorophyll concentration, so as to form a water quality parameter time sequence data set; Obtaining three-dimensional structure data of a pond, generating a three-dimensional structure model of the pond, which comprises three-dimensional coordinates of water depth, a embankment structure and a water inlet and outlet according to the three-dimensional structure data, and dividing the three-dimensional structure model of the pond into a plurality of unstructured grids serving as calculation unit nodes based on a finite volume method; constructing a hydrodynamic force control equation describing the movement of the water flow in the target seawater pond based on a shallow water equation, and constructing a water quality transportation equation describing migration and conversion of the water quality parameters in a flow field based on a convection-diffusion reaction equation; Taking a tail water discharge point and a water supplementing point as flow boundary conditions of the hydrodynamic force control equation, taking the water quality parameter time sequence data collected by each water quality monitoring point as concentration boundary conditions and initial conditions of the water quality transportation equation, and inputting the water quality parameter time sequence data into each calculation unit node; introducing a pressure implicit operator splitting algorithm to carry out iterative solution on the hydrodynamic control equation and the water quality transportation equation, and solving a hydrodynamic field in each calculation time step to obtain flow velocity, flow direction and water level distribution; substituting the flow speed, the flow direction and the water level distribution as driving forces into a water quality transportation equation, and solving to obtain the water quality parameter concentration space distribution of each computing unit node at the corresponding moment to form a hydrodynamic force-water quality coupling simulation field.
3. The seawater pond culture environment regulation method based on tail water monitoring according to claim 1, wherein the method is characterized in that the diffusion path of each pollutant in the pond is identified according to the hydrodynamic-water quality coupling simulation field, the diffusion path of the pollutant and the tail water quality parameter time sequence data are subjected to correlation analysis, and the water quality parameter delay relation between the tail water quality and the water quality of a pond culture area is determined, specifically: extracting concentration distribution data of each pollutant in a water body within a preset time period according to the hydrodynamic force-water quality coupling simulation field, calculating the centroid position of the target pollutant under each time step based on the pollutant concentration gradient field, performing spatial interpolation and time sequence connection on the centroid position of each time step, generating a space-time migration track of each pollutant in a pond, and obtaining a diffusion path of each pollutant; Extracting a concentration time sequence of a target pollutant at a tail water discharge point from the water quality parameter time sequence data set, and sequentially extracting the concentration time sequence from each preset monitoring position point to the tail water discharge point in a culture area from the hydrodynamic force-water quality coupling simulation field along the diffusion path of the pollutant; Constructing a diffusion path concentration transfer model, taking a concentration time sequence of each monitoring position point on a diffusion path as a system input, introducing a transfer function of first-order attenuation and advection-diffusion coupling, taking a concentration time sequence of a tail water discharge point as a system output, and determining characteristic parameters of a water body in the transfer function for transporting pollutants, wherein the characteristic parameters comprise a convection diffusion coefficient, a degradation reaction rate constant and hydraulic retention time; Carrying out inversion calculation on the transfer function along a diffusion path according to the characteristic parameters, and solving a pollutant concentration response function from each monitoring position point to a tail water discharge point in the culture area; Performing convolution deconvolution operation on the pollutant concentration time sequence observed at the tail water discharge point by using the response function, analyzing historical contribution of each pollutant concentration at each monitoring position point on the diffusion path and the change of the historical contribution along with time, and establishing a quantitative contribution relation between the concentration change of the monitoring point in the culture area and the concentration change of the tail water discharge point; Calculating the time interval which is passed from the concentration change peak value of each monitoring position point to the tail water discharge point and causes the concentration response peak value based on the quantitative contribution relation, and obtaining the water quality parameter delay time of each pollutant on the diffusion path, which influences the tail water quality; and integrating the diffusion paths of all pollutants, the quantitative contribution relation of all monitoring position points and the corresponding water quality parameter delay time, and constructing a correlation matrix comprising space paths, contribution weights and time delays to obtain the water quality parameter delay relation between the tail water quality and the pond culture area water quality.
4. The method for regulating and controlling the culture environment of the seawater pond based on tail water monitoring according to claim 1, wherein the tail water in the preset time period of the target seawater pond is monitored, and the water quality change information in the preset time period of each region in the target seawater pond is predicted according to the diffusion path and the water quality parameter delay relation of each pollutant, specifically: acquiring tail water quality information of a tail water discharge point of a target seawater pond within a preset time period, wherein the tail water quality information comprises a time sequence of actual measurement concentration of various pollutants; Performing time forward pushing distribution on each calculation unit node in the cultivation area according to the water quality parameter delay time and the diffusion path corresponding to the water quality parameter delay relation by using the actually measured concentration time sequence of each pollutant in the tail water quality information, and generating a future pollutant concentration basic input sequence of each calculation unit node driven by the current tail water input; Combining real-time hydrodynamic boundary conditions provided by the hydrodynamic-water quality coupling simulation field, carrying out three-dimensional coupling dynamic simulation on a basic input sequence of each calculation unit node, the current water quality initial state of the node, a advection-diffusion transfer process among the nodes and a node internal attenuation reaction based on a degradation reaction rate constant, and iteratively calculating a time-by-time water quality parameter concentration value of each calculation unit node under the combined action of real-time tail water input and pond hydrodynamic force in the whole preset time period by solving a coupled water quality transport equation; And integrating the water quality parameter concentration values of all the calculation unit nodes, and predicting the water quality parameter concentration space-time distribution field of the target seawater pond in a preset time period to obtain the water quality change information of the target seawater pond in the preset time period.
5. The seawater pond culture environment regulation and control method based on tail water monitoring according to claim 1, wherein the clustering operation is performed on water quality change information in a preset time period of each area, and a water quality load accumulation area and a water quality self-cleaning active area in a target seawater pond are identified, specifically: calculating a water quality characteristic vector of each calculation unit node in a preset time period according to the water quality change information, wherein the water quality characteristic vector comprises a pollutant concentration mean value and a pollutant concentration rising or falling rate; Initializing cluster centers of a K-means clustering algorithm, presetting the number K of the cluster centers, calculating the Euclidean distance from each water quality feature vector to each cluster center, and classifying each water quality feature vector into a cluster represented by the cluster center closest to the Euclidean distance; Re-calculating the average value of all the water quality feature vectors in each cluster, taking the average value as a new cluster center of each cluster, repeatedly calculating and re-dividing the distance from the feature vector to the cluster center, and updating the cluster center; Iteratively executing distance calculation, re-dividing and updating the clustering centers until the positions of all the clustering centers are stable and do not change any more, and obtaining a clustering result; According to the clustering result, if the concentration average value of the pollutants in a certain cluster is larger than a first preset value and the concentration descending rate of the pollutants is smaller than a second preset value, identifying the space area corresponding to the cluster as a water quality load accumulation area; And if the average value of the pollutant concentration is not greater than the overall average level of the pond and the descending rate of the pollutant concentration in the preset time period is not less than a second preset value, identifying the space region corresponding to the cluster as a water quality self-cleaning active region.
6. The seawater pond culture environment regulation and control method based on tail water monitoring according to claim 1, wherein the analysis of the water quality load accumulation area and the water quality self-cleaning active area according to the water quality change information is performed to determine a target seawater pond culture environment regulation and control strategy, specifically: Calculating the average value of the pollutant concentration descending rate and the hydrodynamic activity index of each node in a preset time period according to water quality change information from a calculation unit node set of a water quality self-cleaning active region, and selecting the node with the highest average value of the pollutant concentration descending rate and the hydrodynamic activity index larger than a preset threshold as a water purification supplementing candidate node; in the calculation unit node set of the water quality load accumulation area, calculating the pollutant concentration average value and the concentration rising rate average value of each node according to the water quality change information, and selecting the node with the highest pollutant concentration average value and the highest concentration rising rate average value as a polluted water extraction candidate node; Based on the hydrodynamic force-water quality coupling simulation field, calculating a hydraulic communication coefficient between the purified water supplementing candidate node and the polluted water extracting candidate node, and judging whether the communication coefficient is larger than a communication threshold value or not; And if the water quality parameter delay relation is larger than the water quality parameter delay relation, respectively confirming the water purification replenishment candidate node and the polluted water extraction candidate node as a water purification replenishment position and a polluted water extraction position, and determining the water purification replenishment flow and the polluted water extraction flow based on the migration time and the concentration gradient of the pollutants between the two positions in the water quality parameter delay relation, so as to form a cultivation environment regulation strategy of the target mariculture pond.
7. The seawater pond culture environment regulation and control system based on tail water monitoring is characterized by comprising a storage and a processor, wherein the storage comprises a seawater pond culture environment regulation and control method program based on tail water monitoring, and when the seawater pond culture environment regulation and control method program based on tail water monitoring is executed by the processor, the following steps are realized: Acquiring water quality parameter time sequence data of tail water discharge points, water supplementing points and water quality monitoring points of a cultivation area of a target seawater pond, and constructing a hydrodynamic-water quality coupling simulation field by combining pond three-dimensional structure data; Identifying a diffusion path of each pollutant in the pond according to the hydrodynamic force-water quality coupling simulation field, performing correlation analysis on the diffusion path of the pollutant and the time sequence data of the tail water quality parameters, and determining a water quality parameter delay relation between the tail water quality and the water quality of a pond culture area; Monitoring tail water in a preset time period of the target seawater pond, and predicting water quality change information in the preset time period of each area in the target seawater pond according to the diffusion path and water quality parameter delay relation of each pollutant; clustering the water quality change information in a preset time period of each area, and identifying a water quality load accumulation area and a water quality self-cleaning active area in the target seawater pond; and analyzing the water quality load accumulation area and the water quality self-cleaning active area according to the water quality change information, and determining a target seawater pond culture environment regulation strategy.

Description

Seawater pond culture environment regulation and control method and system based on tail water monitoring Technical Field The invention relates to the technical field of culture water quality regulation and control, in particular to a seawater pond culture environment regulation and control method and system based on tail water monitoring. Background Seawater pond culture is an important form of aquaculture, but a high-density and high-bait-feeding culture mode causes accumulation of a large amount of pollutants such as residual bait, feces and the like in a pond, and influences the external environment through tail water discharge, meanwhile, dead corners with uneven pollution loads are easily formed in the pond, and the health and culture benefits of cultured organisms are influenced. In order to realize the sustainability of the cultivation process, the accurate regulation and control of the water quality in the pond and the environmental management are important. At present, environmental regulation and control of an aquaculture pond mostly depends on empirical judgment on water quality data of a plurality of fixed monitoring points in the pond, and regulation and control measures (such as oxygenation, water changing, microbial preparation throwing and the like) often have hysteresis and blindness. The method mainly comprises the following steps of firstly, difficultly quantifying causal relation between tail water discharge and dynamic change of water quality in each area in a pond by a traditional method, failing to accurately predict sources of pollutants, migration paths and space-time distribution of pollutants in the pond, secondly, failing to scientifically identify areas with easily accumulated pollution areas and areas with strong self-cleaning capability of water bodies due to lack of fine characterization of hydrodynamic conditions and water quality migration processes in the pond, and finally, formulating an existing regulation strategy based on overall water quality average conditions, failing to achieve regional treatment and accurate regulation and control, wherein resource waste is possibly caused, and breeding risks are possibly caused by local water quality deterioration. Therefore, the technical method for realizing accurate, prospective and zonal regulation and control of the pond culture environment by deeply coupling tail water monitoring with the hydrodynamic-water quality process in the pond is urgently needed in the prior art. Disclosure of Invention In order to solve at least one technical problem, the invention provides a seawater pond culture environment regulation and control method and system based on tail water monitoring. The invention provides a seawater pond culture environment regulation method based on tail water monitoring, which comprises the following steps: Acquiring water quality parameter time sequence data of tail water discharge points, water supplementing points and water quality monitoring points of a cultivation area of a target seawater pond, and constructing a hydrodynamic-water quality coupling simulation field by combining pond three-dimensional structure data; Identifying a diffusion path of each pollutant in the pond according to the hydrodynamic force-water quality coupling simulation field, performing correlation analysis on the diffusion path of the pollutant and the time sequence data of the tail water quality parameters, and determining a water quality parameter delay relation between the tail water quality and the water quality of a pond culture area; Monitoring tail water in a preset time period of the target seawater pond, and predicting water quality change information in the preset time period of each area in the target seawater pond according to the diffusion path and water quality parameter delay relation of each pollutant; clustering the water quality change information in a preset time period of each area, and identifying a water quality load accumulation area and a water quality self-cleaning active area in the target seawater pond; and analyzing the water quality load accumulation area and the water quality self-cleaning active area according to the water quality change information, and determining a target seawater pond culture environment regulation strategy. In the scheme, the water quality parameter time sequence data of the tail water discharge point, the water supplementing point and the water quality monitoring points of the culture area of the target seawater pond are obtained, and a hydrodynamic force-water quality coupling simulation field is constructed by combining the three-dimensional structure data of the pond, and specifically comprises the following steps: Acquiring a water quality parameter sequence of a plurality of water quality sensors which are arranged in advance in a preset time period acquired by tail water discharge points, water supplementing points and monitoring points in a culture area, wherein the water q