SWAT-based gray water footprint calculation method for cotton

Abstract

The invention discloses an SWAT-based gray water footprint calculation method for cotton. The method comprises the following steps of: determining a grey water footprint accounting range of a to-be-studied area by looking up cotton planting distribution data in the to-be-studied area; determining a proper modeling area within the grey water footprint accounting range; analyzing the water consumption process of cotton planting in the modeling area, and accounting gray water footprint components; collecting elevation data, soil type data, land utilization data, local meteorological and hydrological data and farmland management operation data of the modeling area according to grey water footprint components, inputting the data into SWAT, and dividing a hydrological response unit; and inputting meteorological data, crop management operation and other attributes into the hydrological response unit, constructing a grey water footprint quantitative model of cotton in the to-be-studied area by utilizing SWAT, calibrating and simulating for one year, and calculating the grey water footprint of cotton in the to-be-studied area by taking different substances as indexes. According to the method, the accurate grey water footprint of cotton in the to-be-studied area can be obtained.

Description

technical field [0001] The invention belongs to the technical field of water pollution evaluation methods, and more specifically relates to a SWAT-based cotton gray water footprint calculation method. Background technique [0002] The concept of gray water footprint was proposed by Hoekstra and Chapagain in 2008, which is defined as the amount of fresh water required to dilute a certain pollution load to the maximum concentration allowed by water quality standards. Internationally, there are relatively many studies on blue water footprints and green water footprints, and the research on gray water footprints is still in its infancy. The definition and research methods of gray water footprints need to be further improved. In recent years, many scholars have made relevant research on the gray water footprint from different spatial scales, including the global research scope, the national research scope, and different watersheds as the research scope. Taking the whole world as...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem of rough calculation results and low accuracy caused by the existing gray water footprint calculation method, and propose a SWAT-based gray water footprint calculation method for cotton, which is used to solve the problems caused by crop types and planting management methods. Diversification, difficulty in obtaining detailed data and other issues lead to low accuracy of calculation results, and a more accurate calculation of the gray water footprint of cotton crops in the accounting area

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