Agricultural non-point source pollution risk diagnosis method suitable for irrigation area

Abstract

The invention discloses an agricultural non-point source pollution risk diagnosis method suitable for an irrigation area. The method comprises the following steps: collecting and processing information; carrying out the operations: agricultural non-point source pollution migration rule research and influence factor identification in an irrigation area; determining influence factors which have relatively large influence on agricultural non-point source pollution in the irrigation area, and respectively calculating the influence factors to form a factor spatial database; performing standardization processing and dimension reduction processing on the influence factors in the factor database, and converting the influence factors into 23 principal components; determining an agricultural non-point source pollution risk diagnosis formula in the irrigation area, calculating an agricultural non-point source pollution risk index of each sub-basin, and performing grading; performing simulation byusing a distributed SWAT model to obtain an agricultural non-point source pollution risk index simulation result of each sub-basin; and judging the accuracy of the calculation result according to thesimulation result. The method can accurately diagnose the agricultural non-point source pollution risk, improves the diagnosis efficiency and feasibility, and saves the cost.

Description

Technical field [0001] The present invention relates to the field of environmental protection, in particular agricultural non-point source pollution risk relates to a diagnostic method suitable for the irrigation. Background technique [0002] As my country has gradually point source pollution control, water pollution problems of agricultural non-point source pollution has become an important source of our countries and the global water environment pollution. Non-point source pollution due to agricultural soil refers to disturbances caused farmland soil particles, nitrogen and phosphorus, pesticides and other organic or inorganic contaminants, by Runoff underground infiltration route of precipitation or irrigation water into the process or cause any pollution caused by emissions of livestock and poultry breeding industry. Because of its wide range of pollution, uncertain random occurrence, ways and means of emission, non-point source pollution of agricultural activities difficult...

AI Technical Summary

Problems solved by technology

CN108647401A discloses a watershed nitrogen and phosphorus pollution assessment method based on space remote sensing technology. The method adopts the method of combining typical small watershed data acquisition and the whole watershed SWAT model simulation, and evaluates non-point source nitrogen and phosphorus pollution based on soil moisture, but This method only evaluates the pollution of the water environment by non-point sources through soil leaching, and does not evaluate the overall situation of the whole process of non-point source pollution entering the water body, and the evaluation results need to be verified

CN102867120A discloses a non-point source pollution calculation method based on remote sensing pixels. The method builds a basic database of watersheds, calculates non-point source pollution loads and total river inflows of different pollution types, and calculates the dissolved state and Adsorbed pollutants entering the river coefficient, this method is based on remote sensing data, does not combine the physical and chemical properties of the underlying surface conditions in the watershed, and has not carried out related experimental research on non-point source pollution in the watershed, this calculation method needs to be further optimized

A large number of agricultural non-point source pollution research methods have emerged, and because my country is a large agricultural country and the geographical environment is complex, it is more difficult to directly transplant foreign models, which increases the difficulty of risk diagnosis of agricultural non-point source pollution

[0004] At this stage, there are many studies on the production, discharge and river load of agricultural non-point source pollutants in irrigation areas, but there are few studies on the risk diagnosis of agricultural non-point source pollution in irrigation areas

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