Method for analyzing farmland irrigation hierarchical water requirement amount

Abstract

The invention provides a method for analyzing a farmland irrigation hierarchical water requirement amount. The method comprises the following steps of analyzing a farmland irrigation rigid water requirement amount according to a theoretical water requirement amount and an effective precipitation amount in a crop growth period; analyzing a farmland irrigation elastic water requirement amount according to an advanced farmland irrigation water effective utilization coefficient which is locally recommended; and analyzing a farmland irrigation extravagant water requirement amount according to an irrigation water actual utilization coefficient which is lower than the advanced farmland irrigation water effective utilization coefficient that is locally recommended. The method for analyzing the farmland irrigation hierarchical water requirement amount has advantages of settling problems of low accuracy and large error in calculating the farmland irrigation water requirement amount, performing hierarchical analysis and calculation on the farmland irrigation water requirement, accurately analyzing the water requirement amount in each hierarchy in farmland irrigation, improving water utilization efficiency in farmland irrigation, saving water resource, realizing effective controlling for controlling water for farmland irrigation, and supplying reliable basis for management guidance and planning scheduling of irrigation water.

Description

technical field [0001] The invention relates to the field of water resource demand forecasting, in particular to a method for analyzing water demand in farmland irrigation levels. Background technique [0002] Agricultural water is an important part of my country's current water use, of which water for farmland irrigation accounts for the vast majority. At present, my country's farmland irrigation methods are relatively extensive compared with developed countries, and the phenomenon of flood irrigation and furrow irrigation is still very common. In addition, for some canal-irrigated areas, the effective use coefficient of farmland irrigation water is relatively small, which is 0.7-100% lower than that of developed countries. There is still a large gap in the effective utilization coefficient of farmland irrigation water of 0.8, the waste of water resources is serious, and the effective utilization efficiency of water resources is low. [0003] According to the research, wate...

AI Technical Summary

Problems solved by technology

[0004] At present, my country still adopts the quota method to calculate and predict irrigation water demand. This method only considers irrigation water demand as a whole and does not conduct effective and reasonable analysis of crop water demand. The results are inaccurate and the deviation is large, which is not conducive to the regulation of irrigation water demand, it is difficult to save irrigation water resources and improve the effective use efficiency of irrigation water, and it cannot provide a reliable basis for irrigation water allocation planning and management guidance. Therefore, farmland The analysis and calculation method of irrigation water demand has become a problem to be studied

Images