CN-121303859-B - Enteromorpha green tide salvaging and defense arrangement division determination method

CN121303859BCN 121303859 BCN121303859 BCN 121303859BCN-121303859-B

Abstract

The invention discloses a method for salvaging, deploying and defending areas by green tide of enteromorpha, and relates to the field of prevention and control of green tide disasters of enteromorpha. The method comprises the steps of initially determining a salvaging area, obtaining satellite remote sensing images of the salvaging area, obtaining distribution positions and distribution ranges of green tides of the enteromorpha through interpretation, setting grid units in the distribution ranges of the green tides of the enteromorpha, constructing an enteromorpha green tides ecological dynamics forecasting model, obtaining future forecasting data from an enteromorpha green tides disaster sensitive target to sea areas nearby the grid units, combining the enteromorpha green tides ecological dynamics forecasting model to obtain the drifting positions and biomass of enteromorpha green tides particles at each moment in the future, constructing an enteromorpha green tides salvaging and defense grade model from three aspects of threat of the enteromorpha green tides near the shore, biomass aggregation and take the ground trend, and demarcating the enteromorpha green tides salvaging and defense areas. According to the method, the enteromorpha green tide salvage and defense areas are scientifically and accurately divided, so that guidance can be provided for the priority order of enteromorpha green tide salvage.

Inventors

WU LINGJUAN
GAO SONG
CAI XIAOQING
CAO RUICHEN
LIU GUIYAN
FENG JIE
YUAN CHAO

Assignees

自然资源部北海预报减灾中心(自然资源部青岛海洋中心)

Dates

Publication Date: 20260505
Application Date: 20251212

Claims (7)

1. The method for salvaging and setting up the region of the defense by green tide of enteromorpha is characterized by comprising the following steps of: a. Determining an enteromorpha green tide disaster sensitive target according to prevention and control requirements, and primarily determining a salvage area according to the position of the enteromorpha green tide disaster sensitive target; b. A satellite remote sensing image of a salvaging area is preliminarily determined, and the distribution position and the range of the green tide of the enteromorpha in the salvaging area are obtained through interpretation; c. grid cells are arranged in the green tide distribution range of the enteromorpha; d. Constructing an enteromorpha green tide ecological dynamics forecasting model; e. B, determining the position and biomass of green tide particles of the enteromorpha based on the distribution position and range of the green tide of the enteromorpha obtained in the step b, and combining the ecological dynamics forecast model of the green tide of the enteromorpha constructed in the step d with the obtained forecast data to obtain the drifting position and biomass of the green tide particles of the enteromorpha at each moment in the future; f. c, constructing an enteromorpha green tide salvage and defense arrangement grade model according to the enteromorpha green tide particle drift position and biomass at each moment in the future, wherein the enteromorpha green tide particle drift position and biomass are obtained in the step e, and the enteromorpha green tide near shore threat, biomass aggregation and take the ground trend are three aspects; in step f: The method comprises the steps of calculating the mass center of the green tide of the enteromorpha in each grid unit based on the monitored distribution position of the green tide of the enteromorpha, simultaneously obtaining shoreline vector data, calculating the nearest distance from the mass center of the green tide of the enteromorpha in each grid unit to the shoreline one by one, calculating an initial risk index according to the piecewise index function, and carrying out global normalization treatment to obtain the offshore distance risk index, such as formula (5) and formula (6); (5) (6) In the formula (5), k is a shore segment number, k=1, 2, & m, m is the total number of shore segments, i is a grid unit number, i=1, 2, & n, n is the total number of all grid units, D ik is the nearest distance from the green tide mass center of all enteromorpha in the ith grid unit to the kth shore segment, D i represents the initial risk index of the ith grid unit, and DK i represents the normalized offshore distance risk index; The method comprises the steps of f2, quantifying the biomass aggregation degree of the green tide of the enteromorpha by adopting an enteromorpha green tide biomass aggregation index, wherein the enteromorpha green tide biomass aggregation index is calculated by firstly obtaining the biomass change condition of all the green tide particles of the enteromorpha in a future period based on an enteromorpha green tide ecological dynamics prediction model, then calculating the ratio of biomass and distribution area of all the green tide particles of the enteromorpha in each grid unit in each hour to obtain the green tide biomass density of the enteromorpha, counting three future prediction moments T 1 =24h,T 2 =72h,T 3 = 168h, calculating the green tide biomass density of the enteromorpha in an ith grid unit, and weighting to synthesize a biomass aggregation basic value W i , wherein the specific calculation is shown in a formula (7) and a formula (8); (7) (8) In the middle of Biomass density at forecast time T k for the ith grid cell; for the total biomass of all the enteromorpha green tides in the ith grid unit at the initial moment, In order to accumulate biomass increment from the initial time of green tide biomass of all Enteromorpha prolifera to the time T k in the ith grid unit, T 1 =24h,T 2 =72h,T 3 =168 h, A is the area of the grid unit, As the weight coefficient, C 1 、C 2 and C 3 were set to 50%, 30%, 20%, respectively; then normalizing the biomass aggregation basic value to obtain the enteromorpha green tide biomass aggregation index: (9) f3, adopting take the ground trend index to represent green tide take the ground trend of the enteromorpha; The take the ground trend index reflects the consistency of the main body drift direction of the enteromorpha green tide particles and the coastline direction in three days in the future, namely when the included angle between the main body drift direction and the coastline direction is smaller, the risk of affecting the offshore area take the ground is larger; for the ith grid unit, the take the ground trend index calculation step comprises the steps of firstly calculating the main body drift direction based on the distribution position of enteromorpha green tide particles in the grid unit at the initial moment and after 72 hours, then respectively calculating the included angle between the main body drift direction and the coastal normal of each coastal section, taking the minimum included angle as the take the ground trend index of the grid unit, and take the ground trend index Calculation as in equation (10); (10) in the formula (10), the amino acid sequence of the compound, For the i-th grid cell enteromorpha green tide particle drift direction and the k-th shoreline shoreside direction included angle k=1, 2,.. M; Based on the offshore distance risk index, the enteromorpha green tide biomass aggregation index and take the ground trend index, calculating the enteromorpha green tide salvage priority index through weighted fusion As in equation (11); (11) In the formula (11), R 1 、R 2 and R 3 respectively represent weights, and the sum of the weights is 1; g. and f, demarcating an enteromorpha green tide salvage and defense arrangement area according to the enteromorpha green tide salvage and defense arrangement level model constructed in the step f.
2. The method for salvaging and setting up a region of enteromorpha green tide according to claim 1, wherein in the step c, the size of each grid unit is not more than 10km×10km.
3. The method for salvaging, arranging and defending the green tide of the enteromorpha as claimed in claim 1 is characterized in that in the step d, an enteromorpha green tide power drift submodule is constructed by considering the dragging effect of wind speed and flow speed on the green tide particles of the enteromorpha, and the motion equation of the green tide particles of the enteromorpha is shown as the following formula (1): (1) in the formula (1), the components are as follows, The position of the ith enteromorpha green tide particle at the time t; For the surface flow rate, A wind speed of 10m at sea surface; Acting as a flow velocity coefficient; is the wind speed acting coefficient; the change of wind to the movement direction of green tide particles of enteromorpha is shown, the x-axis direction is The y-axis direction is Wherein Is the included angle between wind and the coordinate axis of the x-axis direction, The deflection angle is towed for the wind.
4. The method for salvaging, arranging and defending areas of green tide of enteromorpha as set forth in claim 3, wherein the method is characterized in that the green tide growth and extinction of the enteromorpha are made by taking temperature, illumination and nutrient salt into consideration, an ecological sub-module for biomass change of the green tide of the enteromorpha is constructed, and the green tide particles of the enteromorpha are produced in the following steps of The biomass change over time is shown in formula (2): (2) In the formula (2), the amino acid sequence of the compound, For the single-day biomass change of the j-th enteromorpha green tide particle, For the single-day biomass increment of the j-th enteromorpha green tide particle, A single daily reduction of biomass of green tide particles of the jth enteromorpha; (3) In the formula (3), the amino acid sequence of the compound, Is the green tide particle biomass of the j-th enteromorpha, For the maximum daily growth rate of green tide of enteromorpha, 、、 The non-dimensional limiting coefficients of temperature, illumination and nutrient salt on the green tide growth rate of the enteromorpha are respectively shown; (4) In the formula (4), the amino acid sequence of the compound, Is the maximum mortality rate; A dimensionless limiting coefficient for temperature versus mortality; is the green tide particle biomass of the j th enteromorpha; Combining the constructed enteromorpha green tide power drift submodule and the enteromorpha green tide biomass change ecological submodule to obtain an enteromorpha green tide ecological dynamics forecasting model.
5. The method for salvaging, setting and defending the enteromorpha green tide according to claim 1 is characterized in that in the step e, the future forecast data comprises the steps of obtaining surface sea current, sea temperature and nutrient salt data from a disaster sensitive target to a sea area near a grid unit for 7 days based on a three-dimensional marine ecological dynamics model, and obtaining sea surface wind and solar shortwave radiation data from the disaster sensitive target to the sea area near the grid unit based on a weather forecast model.
6. The method for salvaging and preventing areas by using enteromorpha green tide according to claim 1, wherein in the step f3, when the offshore nearest distance of enteromorpha green tide particles is more than 100km, the prevention and control mainly consider the offshore distance and biomass, and R 1 =0.5,R 2 =0.4,R 3 = 0.1 is set; when the closest offshore distance of the enteromorpha green tide particles is less than 100km and more than 30km, the offshore distance is more important than other factors, and R 1 =0.4,R 2 =0.3,R 3 = 0.3 is set; When the offshore distance of the green tide particles of the enteromorpha is less than 30km, the offshore distance is obviously increased compared with the importance of other factors, and R 1 =0.6,R 2 =0.2,R 3 =0.2 is set.
7. The method for setting up the salvage and defense areas by green tide of enteromorpha as claimed in claim 1, wherein in the step g, according to the enteromorpha green tide salvage priority index H i of all grid units, the salvage and defense areas are divided into four grades according to all grid units, and then different colors are given to the areas with different grades so as to set up a salvage and defense diagram; the four grades are respectively an I-grade important salvage area, an II-grade salvage cruising area, an III-grade monitoring guard area and an IV-grade cruising area, wherein when When the fishing device is divided into I-level important fishing areas Dividing into II-level salvage navigation areas when Dividing into III-level monitoring guard zone when Dividing into IV-level navigation areas; Wherein the method comprises the steps of 75%, 50% And 25% fractional numbers of Hi values of all grid cells, respectively.

Description

Enteromorpha green tide salvaging and defense arrangement division determination method Technical Field The invention relates to the field of enteromorpha green tide disaster prevention and control, in particular to a method for salvaging, arranging and defending areas of enteromorpha green tide. Background The enteromorpha green tide has the characteristics of high biomass, long-distance migration process and great influence. Salvaging on the sea, intercepting near the shore and cleaning the beach are three defense lines for preventing and controlling green tide of enteromorpha. In the process of salvaging the green tide of the enteromorpha, when the green tide of the enteromorpha is threatened by different development stages, different biomass and different distances from a sensitive target, the green tide of the enteromorpha needs to be salvaged preferentially, and no clear method guidance exists at present. The invention patent of China with the application publication number of CN116467565A discloses an optimal search area forecasting method for green tide plaques of enteromorpha, which constructs an enteromorpha green tide plaque Monte Carlo probability drift model considering uncertainty of drift, aggregation and splitting, and statistically analyzes distribution probability according to a time period possibly reached by a salvaged ship to forecast an optimal search area. However, it also does not involve the prioritization of the green tide salvage of enteromorpha. Disclosure of Invention Based on the technical problems, the invention provides an enteromorpha green tide salvaging and defense setting method. The technical scheme adopted by the invention is as follows: An enteromorpha green tide salvaging and defense setting-up area defining method comprises the following steps: a. Determining an enteromorpha green tide disaster sensitive target according to prevention and control requirements, and primarily determining a salvage area according to the position of the enteromorpha green tide disaster sensitive target; b. A satellite remote sensing image of a salvaging area is preliminarily determined, and the distribution position and the range of the green tide of the enteromorpha in the salvaging area are obtained through interpretation; c. grid cells are arranged in the green tide distribution range of the enteromorpha; d. Constructing an enteromorpha green tide ecological dynamics forecasting model; e. B, determining the position and biomass of green tide particles of the enteromorpha based on the distribution position and range of the green tide of the enteromorpha obtained in the step b, and combining the ecological dynamics forecast model of the green tide of the enteromorpha constructed in the step d with the obtained forecast data to obtain the drifting position and biomass of the green tide particles of the enteromorpha at each moment in the future; f. c, constructing an enteromorpha green tide salvage and defense arrangement grade model according to the enteromorpha green tide particle drift position and biomass at each moment in the future, wherein the enteromorpha green tide particle drift position and biomass are obtained in the step e, and the enteromorpha green tide near shore threat, biomass aggregation and take the ground trend are three aspects; g. and f, demarcating an enteromorpha green tide salvage and defense arrangement area according to the enteromorpha green tide salvage and defense arrangement level model constructed in the step f. The beneficial technical effects of the invention are as follows: According to the method, the enteromorpha green tide salvage and defense areas are scientifically and accurately divided, so that guidance can be provided for the priority sequence of enteromorpha green tide salvage, and key technical support is provided for salvage decisions. Specifically: (1) Aiming at the salvage scene, the method fuses three core indexes of offshore threat, biomass aggregation and take the ground trend for the first time, and is different from the current research that disaster risk early warning or assessment is mainly carried out from green tide concentration of enteromorpha. The risk attenuation characteristic of the offshore distance of the enteromorpha is quantified through the offshore distance risk index, the problem of boundary effect of a distance inverse method is solved, the biomass aggregation index integrates future forecast data, a time weighting mechanism is adopted to highlight the accumulated pressure of biomass, take the ground trend indexes are associated with the included angle between the drift direction and the shoreline, and the login probability is accurately pre-judged. The model dynamically couples a plurality of dimensions such as space distance, time evolution, ecological load, login direction and the like which are represented by the indexes, realizes jump from static early warning to dynamic risk assessment, and improves scientificit