Method for calculating grassland irrigation land water resource consumption

Abstract

The invention discloses a method for calculating water resource consumption of grassland irrigation land, which comprises the following steps of: performing ET long-sequence expansion on an equivalent decomposition area by utilizing a stable gradual change characteristic of a grassland area reference crop coefficient on a time scale, and coupling area reference crop evapotranspiration by utilizing an improved reference crop coefficient method to calculate the water resource consumption of grassland irrigation land. The grassland region evapotranspiration long sequence extension under remote sensing image missing, especially non-sunny interference, is realized, the problem that remote sensing region evapotranspiration ET calculation is difficult is solved, and the precision of grassland region evapotranspiration ET long sequence calculation is improved. Aiming at the grassland irrigation land water resource consumption calculation problem, the method quantitatively determines the water resource consumption GW value of the grassland area irrigation land crop growth season through the irrigation land water resource consumption calculation model, defines the key area of grassland area underground water resource real-time monitoring and management, and improves the grassland irrigation land water resource utilization rate. Typical case analysis reference is provided for grassland area underground water resource development and utilization management and grassland ecosystem research in irrigated land vegetation construction.

Description

technical field [0001] The invention belongs to the field of water resource management and water monitoring in pastoral areas, and in particular relates to a calculation method for water resource consumption in grassland irrigated land. Background technique [0002] For grassland areas with relatively fragile ecological structures, irrigation will not only increase the yield of forage and food crops, improve the disaster resistance and livestock protection capacity of pastoral areas and the carrying capacity of grasslands, but also change the water cycle process of grassland ecosystems, making them appear "natural- society” duality. At the same time, grasslands will consume local water resources and directly affect ecological environment changes. Reasonable calculation of water consumption in irrigated land plays a decisive role in grassland ecosystems and economic and social stability in pastoral areas. [0003] In the process of calculating the water consumption of grassl...

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Problems solved by technology

Existing methods such as constant evaporation ratio method, sinusoidal curve method, canopy resistance method, constant reference crop coefficient method, etc., are used to carry out time-scale long-sequence expansion, using two regional ET remote sensing calculation results, and by interpolating the missing regional ET of remote sensing images, In addition to subjectively weakening the interference of changes in surface temperature and soil moisture on ET, it is easier to weaken the influence of meteorological parameter changes caused by weather, especially non-sunny days, and ignore the gradual change caused by vegetation growth on the underlying surface. The accuracy of long-sequence ET results obtained by changing vegetation parameters cannot be guaranteed, and it is difficult to effectively control the convergence and dispersion of errors, which seriously affects the calculation results and accuracy

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