Model for farmland net irrigation water and irrigation water capacity estimation method

Abstract

The invention relates to the field of ecological hydrology, in particular to a model for farmland net irrigation water. The model comprises a central data processor, a vegetation retention module, a runoff module, an evapotranspiration module and a soil water content module, wherein the central data processor realizes data transmission with the vegetation retention module, the runoff module, the evapotranspiration module and the soil water content module respectively. According to the model, large-scale nonuniformity of the earth surface is fully taken into consideration, spaces are dispersed into pixels; a part of parameters required by each sub-module in the model for the farmland net irrigation module is inversed on a pixel scale; an eco-hydrological process module is coupled; the whole process simulation of rainfall vegetation retention, soil water content, runoffs and evapotranspiration is performed; the farmland soil water content is monitored in real time; and whether a farmland is required to be irrigated or the required irrigation water capacity can be known in time, and situations that farmlands cannot be irrigated in time or the irrigation capacity is too large result in agricultural production loss and water resource waste are avoided.

Description

technical field [0001] The invention relates to the scientific field of ecohydrology, in particular to a farmland net irrigation water model and a method for estimating irrigation water consumption. Background technique [0002] The increase in agricultural water use, especially irrigation water, has brought about a drop in the groundwater table and a drastic reduction in surface water. Estimating the spatiotemporal pattern of irrigation water use in farmland is important for water resource management and food security. [0003] Net irrigation water refers to the amount of irrigation water required for the normal growth of crops in a certain period of time, except for precipitation replenishment. When the soil water content cannot meet the needs of the normal growth of crops, irrigation and supplementation are required. According to the principle of water balance, the sum of vegetation precipitation interception, effective crop evapotranspiration, runoff, and soil moisture...

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Problems solved by technology

However, for large areas or watersheds, the above method cannot accurately estimate the spatial distribution o...

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