Method for determining key control variant of black and odorous water body and target value of key control variant

Abstract

The invention discloses a method for determining a key control variant a black and odorous water body and a target value of the key control variant, the method comprises the following steps: (1) collecting or monitoring observation data of n groups of the ferrous ion concentration Fe, the total phosphorus concentration P, the total nitrogen concentration N, the dissolved oxygen concentration D andthe concentration C of chlorophyll a of the to-be-treated black and odorous water body; acquiring a corresponding density function of the ferrous ion concentration; (2) acquiring new data of the total phosphorus concentration P'; (3) acquiring one regression tree not pruned; (4) acquiring k regression trees not pruned; (5) acquiring a pseudo-density function of the ferrous ion concentration; (6)calculating the Jensen-Shannon divergence between the F(Fe) and n G(Fe), taking the maximum value as the measurement of the importance of the total phosphorus; (7) acquiring the importance of the total nitrogen, the dissolved oxygen and the chlorophyll a; (8) acquiring the key control variant of the black and odorous water body; and (9) acquiring a management target value of the key control variant in the black and odorous water body. The environment variant mostly important for the treatment of the black and odorous water body and the management target value of the variant are determined, andthe method is easy to popularize in the treatment of the black and odorous water body.

Description

Technical field [0001] The invention relates to a method for determining key control variables of black and odorous water bodies and their target values, and belongs to the field of water quality management. Background technique [0002] With the rapid development of my country's economy and society, black and odorous phenomena frequently occur in many urban water bodies in my country. According to research, the black and odor of water is mostly caused by the presence of ferrous sulfide in the water; however, the concentration of ferrous sulfide is difficult to directly control, and its concentration can only be controlled indirectly by controlling other environmental variables. In the current research, there is no method to determine the key control variable of the concentration of ferrous sulfide in natural water, and there is no method to establish the management target value of the key control variable in the black and smelly water. Summary of the invention [0003] The purpo...

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Problems solved by technology

After research, the phenomenon of black and odorous water bodies is mostly caused by the existence of ferrous sulfide in water bodies; however, the concentration of ferrous sulfide is difficult to control directly, and its concentration can only be controlled indirectly by controlling other environmental variables

In the current research, there is no method to determine the key control variables that play a role in the concentration of ferrous sulfide in natural water bodies, and there is also a lack of methods to formulate management target values ​​for key control variables in black and odorous water bodies

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