Lake eutrophication evaluation method based on water-body absorption coefficients

An absorption coefficient and eutrophication technology, applied in the field of environmental science and monitoring, can solve the problems of lack of quantitative relationship model, unpopular remote sensing, time-consuming and labor-intensive, etc., to achieve the effect of protecting the environment, saving the use of chemical reagents, and being easy to operate.

Active Publication Date: 2017-03-15
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires the determination of a large number of water quality parameters, which is time-consuming and laborious, and the cost is high, and the water quality parameter determination process requires the use of a large number of chemical reagents, which itself is harmful to the water environment.
In addition, because most of the parameters required by this method need to be measured in the laboratory, there is currently no instrument that can complete lake eutrophication assessment in situ; the second method using remote sensing is not popular, mainly because Due to the lack of quantitative relationship models between lake water optical parameters and eutrophication status

Method used

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  • Lake eutrophication evaluation method based on water-body absorption coefficients
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  • Lake eutrophication evaluation method based on water-body absorption coefficients

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Effect test

Embodiment 1

[0045] According to the method of the present invention, the absorption coefficient of the water body at 440nm is used to estimate the comprehensive nutritional status index of Tianmu Lake, and compared with the comprehensive nutritional status index value calculated according to the traditional method (Table 1). According to the comprehensive nutrient state index and nutrient level of the water body of Tianmu Lake calculated by the method of the present invention, estimated values ​​and corresponding errors are shown in Table 1 below:

[0046] Table 1 The present invention is applied evaluation result in Tianmu Lake

[0047]

[0048] The parameters for analyzing the calculation accuracy of the comprehensive nutritional status index of water body are the average relative error APD and the root mean square error RMS between the measured value of the comprehensive nutritional status index of water body and the calculated value of the model, and the calculation formula is as fo...

Embodiment 2

[0054] According to the method of the present invention, the comprehensive nutrient state index of Qiandao Lake is estimated by using the absorption coefficient of the water body at 440nm, and compared with the value of the comprehensive nutrient state index calculated according to the traditional method (Table 2). According to the comprehensive nutrient state index and nutrient level of Qiandao Lake water body calculated according to the method of the present invention, estimated values ​​and corresponding errors are shown in Table 2 below:

[0055] Table 2 The present invention is applied evaluation result in Qiandao Lake

[0056]

[0057]

[0058] After inspection, the average relative error APD=8% and the root mean square error RMS=3.75 of the present invention applied in Qiandao Lake, the model is suitable for the estimation of comprehensive nutrient state index of Qiandao Lake water body and has high precision.

Embodiment 3

[0060] According to the method of the present invention, the absorption coefficient of the water body at 440nm is used to estimate the comprehensive nutrient state index of Taihu Lake, and compared with the value of the comprehensive nutrient state index calculated according to the traditional method (Table 3). According to the comprehensive nutrient state index and nutrient grade of Taihu Lake water body calculated according to the method of the present invention, estimated value and corresponding error are shown in the following table 3:

[0061] Table 3 The present invention applies evaluation result in Taihu Lake

[0062]

[0063] After inspection, the average relative error APD=4% and the root mean square error RMS=3.66 when the present invention is applied in Qiandao Lake, the model is suitable for estimating the comprehensive nutrient state index of Taihu Lake water body and has high precision.

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Abstract

The invention discloses a lake eutrophication evaluation method based on water-body absorption coefficients. The lake eutrophication evaluation method includes the steps that the absorption coefficients of lake-water-body suspended particles and colored dissolved organic substances at a wave band of 400 nm are measured, and the sum of the absorption coefficients of the substances is calculated, and the water-body absorption coefficients at (440) of a lake water body at the wave band of 400 nm are obtained; after a relationship mode of the at (440) and lake comprehensive nutrition state coefficients TLI is established, the lake-nutrition-state classification standard based on the at (440) is determined according to the TLI coefficient range. Lake eutrophication is evaluated with the lake eutrophication evaluation method, measurement of fussy and nitrogen nutritive salt and measurement of alga biomass are not required, and rapid evaluation and type classification of lake eutrophication can be achieved in the mode that the absorption coefficients of the water body at 440 nm only need to be measured; operating is easy to carry out, the cost is low, and the method is easy to popularize, and the advantages of the lake eutrophication evaluation method are quite obvious; in addition, as the water-body absorption coefficients can be measured in an in-situ mode, the precondition can be provided for establishing a measurement method based on the in-situ lake eutrophication state index.

Description

technical field [0001] The invention relates to the field of environmental science and monitoring technology, and relates to a lake eutrophication evaluation method, in particular to a lake eutrophication evaluation method based on water body absorption coefficient, which realizes rapid evaluation of lake eutrophication and classification of nutritional state types. Background technique [0002] The essence of lake eutrophication is due to the accumulation of nitrogen and phosphorus nutrients and dissolved organic matter in the lake, which is manifested by the high content of nitrogen and phosphorus nutrients in the lake, which exceeds the self-purification capacity of the lake. For the needs of economic production, human beings ignore the laws of nature. On the one hand, they discharge industrial, domestic and agricultural wastewater to the lake body through hydrological processes such as river channels and runoff in the form of point and area sources; on the other hand, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 施坤张运林
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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