Analysis method of response of surface water quality to drought and flood events

Abstract

The invention discloses an analysis method of response of surface water quality to drought and flood events. The analysis method is characterized by comprising the following steps: step one, analyzing historical evolution and developing trend of drought and flood events; step two, building and calibrating an SWAT model; step three, calculating total nitrogen and total phosphorus; and step four, analyzing response of the surface water quality to the drought and flood events. Compared with the prior art, the analysis method is capable of screening typical representative months of drought events, flood events and drought and flood sudden turning events by combining indexes such as a standardized precipitation index, 24-hour precipitation amount and continuous non-rainy days and the like based on climate model forecasting results, the SWAT model and a statistic analysis method, comparing and analyzing the influence of drought and flood events to the water quality of the typical months and effectively analyzing a response relationship between the surface water quality change and the drought and flood events. The analysis method is especially applicable to analysis of the response of the surface water quality to the drought and flood events in the Hetao area.

Description

technical field [0001] The invention relates to the field of water pollution prevention and response, in particular to a response analysis method of surface water quality to drought and flood events. Background technique [0002] According to statistics from the Ministry of Environmental Protection, 9% of the 941 environmental emergencies between 2006 and 2012 were caused by natural disasters. Extreme weather events such as heavy rain, floods and droughts have become important causes of water pollution accidents, and most pollution accidents It is caused by industrial point source pollution and agricultural non-point source pollution, which bring pollutants into water bodies due to heavy rain. Extreme weather events such as drought and flood have seriously threatened the safety of surface water environment. The increasing intensity and frequency of extreme weather such as heavy rain, flood, and drought will further increase the possibility and severity of pollution accidents...

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Problems solved by technology

[0004] In mountainous areas with complex geology and heavy rainfall, heavy rainfall may even lead to mudslides and flash floods, which will not only cause a large number of human and livestock casualties and property losses, but also seriously pollute the surface water environment

In 2007, Polyakov et al. proposed that sudden heavy rainfall not only caused soil erosion, but also brought a large amount of organic matter, nutrient salts, and pathogens in the soil into the water body, causing serious water pollution.

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