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Emergency monitoring and early warning methods of red tide disasters along the coast of South China

A measurement method, red tide technology, applied in the direction of measuring device, scattering characteristic measurement, material analysis through optical means, etc., can solve the problems such as the emergency treatment ability needs to be improved, and achieve the effect of ensuring high efficiency and accuracy

Inactive Publication Date: 2018-02-06
国家海洋局南海预报中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The red tide monitoring and early warning system needs to be improved urgently, and the red tide prevention and emergency response capabilities need to be improved

Method used

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  • Emergency monitoring and early warning methods of red tide disasters along the coast of South China
  • Emergency monitoring and early warning methods of red tide disasters along the coast of South China
  • Emergency monitoring and early warning methods of red tide disasters along the coast of South China

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This implementation takes the red tide event that occurred in the coastal waters of western Guangdong on November 24, 2014 as an example, and uses MODISL1b data as remote sensing images to describe in detail the process of using the method to identify red tide water bodies in the South China coast. The method comprises the steps of:

[0049] A: Receive MODIS L1 data on November 24, 2011, use calibration parameters to perform radiometric calibration, geometric correction, and atmospheric correction processing; use Matlab software to convert MODIS L1b data through hdf header file parameters, and estimate Rayleigh scattering of atmospheric molecules.

[0050]

[0051] f 0 (λ) is the solar irradiance corresponding to different wavelengths outside the atmosphere, and its size varies with the distance between the sun and the earth, μ and μ 0 are the cosines of the sun’s zenith angle and the satellite’s zenith angle, α ↓ and alpha ↑ , represent the scattering phase angl...

Embodiment 2

[0089] In this embodiment, based on the optical radiation transfer simulation software-Hydrolight, 350 sets of simulated reflectance data were generated by applying the second-class water body model, and the chlorophyll concentration data were extracted by using the reflectance data. And the accuracy of the algorithm is verified. The method comprises the steps of:

[0090] A: Use Hydrolight radiative transfer simulation software to simulate seawater albedo data with different chlorophyll concentrations.

[0091] B: Using the reflectance data obtained in step A, further adopt the 6-band algorithm to calculate the backscattering coefficient of seawater particles, the specific steps are as follows:

[0092] 412-665nm remote sensing reflectance expression r rs for:

[0093]

[0094] where g 1 and g 2 are 0.0949 and 0.0797, respectively. a is the total absorption coefficient of seawater, b b is the total backscattering coefficient of seawater.

[0095] where a contains t...

Embodiment 3

[0112] This implementation takes the red tide event that occurred in the coastal waters of western Guangdong as an example, and uses the field observation data as input parameters to describe in detail the process of using the method to identify red tide water bodies in the South China coast. The method comprises the steps of:

[0113] A: Randomly select 10 observation points at an observation site off the coast of western Guangdong, collect spectral data on site, and calculate reflectance.

[0114]

[0115] L W is the radiance away from water, E d is the incident irradiance.

[0116] The reflectance calculation results are as follows Figure 5 shown.

[0117] B: Utilize the reflectance data obtained in step A to calculate the fluorescence height (FLH), wherein the calculation of FLH adopts three bands of 667nm, 678nm, and 748nm for ratio calculation; the specific method of calculating FLH is as shown in formula (10):

[0118]

[0119] For the calculated results, se...

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Abstract

The invention relates to an emergency monitoring and early warning method for red tide disasters at the coastal region of South China, which comprises the following steps: reflectivity data are obtained based on corresponding water spectroscopic data, fluorescence height is calculated by using the obtained reflectivity data, a water particulate matter backward backscattering coefficient is extracted by adopting a 6-wave band algorithm, chlorophyll concentration is estimated by adopting the 6-wave band algorithm based on the obtained water particulate matter backward backscattering coefficient, and finally, the breakout probability of red tides can be read according to the obtained fluorescence height value, the obtained water particulate matter backward backscattering coefficient and the obtained chlorophyll concentration. The emergency monitoring and early warning method has good discriminating capability for breakout probability of the red tides at the coastal region of South China and provides decision support for coping with red tide events.

Description

technical field [0001] The invention relates to a red tide water analysis method, in particular to a red tide disaster emergency monitoring and early warning method. Background technique [0002] The distribution data products of water quality parameters retrieved based on satellite remote sensing images MODIS can be used to analyze the probability of red tide outbreaks, the eutrophication of water bodies, and the level of primary productivity. Accurate identification of red tide outbreaks is of great significance to the development of research on seawater quality, fishery resources, and tourism. [0003] In recent years, with the coupling effect of unrestrained human economic activities on nature, red tides have occurred frequently along the coast of my country, causing heavy losses to local fisheries. In 2010, a total of 69 red tides occurred along the coast of China, with a cumulative area of ​​10,892 square kilometers. 14 times in the South China Sea, with a cumulative...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/53G01N21/55
CPCG01N21/53G01N21/55G01N2021/4709
Inventor 杨超宇白毅平罗军
Owner 国家海洋局南海预报中心