Irrigation water productivity scale conversion method and device

Abstract

The application belongs to the technical field of the farmland irrigation, and specifically relates to an irrigation water productivity scale conversion method and device. The method comprises the following steps: dividing mother scale region into more than two sub-scale regions, coupling two factors of spatial variability and return water reutilization to obtain an irrigation water productivity scale conversion relation of the sub-scale region and the mother-scale region, thereby accurately and conveniently acquire the mother scale region irrigation water productivity through the collected basic data. Through the method disclosed by the application, the spatial variability and the return water reutilization are coupled at the same time, and the problem that the final result is bad in accuracy when only one factor is used for performing irrigation water productivity scale conversion in the prior art can be solved; the basic data required by the invention is easy to obtain, the method is simple, and the problems that the used time is long and the computing difficulty is large when the complex hydrological model acquires the irrigation water productivity of the mother scale productivity can be solved in the premise of guaranteeing the result accuracy.

Description

technical field [0001] The application belongs to the technical field of farmland irrigation, and in particular relates to a method and device for scaling conversion of irrigation water productivity. Background technique [0002] Irrigation water productivity refers to the quantity of agricultural products that can be produced per unit of irrigation water, and is one of the indicators that characterizes the level of regional water use. In a large-scale irrigation area, due to the differences in the two factors of spatial variability and return water reuse in different spatial scale areas, the irrigation water productivity in different scale areas is also different. Since the irrigation water productivity in small-scale areas is relatively easy to calculate, the scale conversion method of irrigation water productivity can be constructed, and the irrigation water productivity in large-scale areas can be calculated by using the irrigation water productivity in small-scale areas...

AI Technical Summary

Problems solved by technology

[0003] Existing irrigation water productivity scale conversion methods often perform scale conversion based on the above two factors, but the method of scaling only considering one of the factors will ignore the physical mechanism of the scale effect, resulting in poor accuracy of the final results

However, in the process of obtaining the irrigation water productivity of the parent-scale area by establishing a hydrological simulation model, it usually takes a lot of time to model, and a large number of complex calculation formulas are required to calculate, which increases the difficulty of calculation

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