A model of farmland net irrigation water consumption and a method for estimating irrigation water consumption

Abstract

The invention relates to the scientific field of ecohydrology, in particular to a farmland net irrigation water model. The model includes a central data processor, a vegetation interception module, a runoff module, an evapotranspiration module and a soil water content module, wherein the central data processor has data transmission with the vegetation interception module, the runoff module, the evapotranspiration module and the soil water content module respectively. The invention fully considers the large-scale surface heterogeneity, discretizes the space into pixels, inverts some parameters required by each sub-module in the farmland net irrigation water model on the pixel scale, couples the ecological hydrological process model, and performs precipitation The simulation of the whole process of vegetation interception, soil water content, runoff and evapotranspiration realizes the real-time monitoring of the soil water content of the farmland, and can know in time whether the farmland needs to be irrigated, or the amount of water required for irrigation, so as to avoid that the farmland cannot be irrigated in time or Excessive irrigation, resulting in loss of agricultural production and waste of water resources.

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...

AI Technical Summary

Problems solved by technology

However, for large areas or watersheds, the above method cannot accurately estimate the spatial distribution of a specific area due to insufficient consideration of the heterogeneity of the surface, which has great limitations.

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