Diagnosis and evaluation method for water quality of eutrophic shallow lake subjected to ecological restoration

Abstract

The invention provides a diagnosis and evaluation method for the water quality of an eutrophic shallow lake subjected to ecological restoration, which comprises the following steps of: selecting two factors, i.e. water transparency and chlorophyll a concentration which are important for water-quality improvement and stabilization in the ecological restoration process of the eutrophic shallow lake, comprehensively considering the interaction between the two factors, and establishing a water-quality diagnosis index-lake water quality index (LQI) of the eutrophic shallow lake subjected to the ecological restoration. The LQI can be used for quantitatively describing the conversion between the clean-water steady state and the muddy-water steady state of the eutrophic shallow lake so as to provide a visual and convenient diagnosis method for the water quality of the eutrophic shallow lake subjected to ecological restoration and also provide a scientific and reasonable reference basis for the drafting of management measures of the eutrophic shallow lake subjected to ecological restoration and the selection and the application of a subsequent ecological engineering method.

Description

technical field [0001] The invention relates to a method for diagnosing and evaluating the water quality of eutrophic shallow lakes after ecological restoration. Background technique [0002] Eutrophication is the phenomenon that under the influence of human activities, a large amount of nutrients such as nitrogen and phosphorus required by organisms enter slow-flowing water bodies such as lakes, estuaries, and bays, causing algae and other plankton to multiply rapidly, reducing dissolved oxygen in water bodies, and deteriorating water quality. , a phenomenon in which fish and other organisms die in large numbers. The salient feature of eutrophic water body is the occurrence of a large number of phytoplankton, which will lead to catastrophic consequences such as deterioration of water quality, decline of water body function, and death of aquatic organisms. It not only restricts the availability of lake resources, makes the water body lose its due function, and The ecologica...

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Problems solved by technology

At the same time, lake eutrophication belongs to the concept of ecology. Therefore, there are obvious disadvantages in diagnosing and evaluating the water quality of the eutrophic shallow lake ecosystem after the initial restoration and reconstruction through simple physical and chemical indicators.

However, the comprehensive nutritional status index (TLI) method for comprehensive evaluation of water quality through transparency, total nitrogen, total phosphorus content, and chlorophyll a and COD as parameters is too complicated, with long operation cycles, high requirements for personnel and equipment, and limited water quality conversion. The slow response also limits the application in the diagnosis and evaluation of water quality after ecological restoration of eutrophic shallow lakes

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