A rice-wheat rotation farmland waterlogging early warning and evaluation method and system

Abstract

The invention discloses a rice-wheat rotation farmland waterlogging early warning evaluation method and system. The method includes: obtaining historical meteorological data; establishing a mathematical model of rainfall by using a machine learning method according to the historical meteorological data; obtaining rainfall data for a set number of days in the future; according to the rainfall data and the mathematical model of rainfall, Predict the future field surface water depth or groundwater level; obtain the allowable flooding depth of rice in each growth period and the allowable maximum groundwater level in wheat season; judge whether the ground water depth exceeds the allowable flooding depth or whether the groundwater level exceeds the allowable maximum groundwater level; If yes, issue early warning information and calculate the yield reduction rate of rice or wheat; assess waterlogging disasters based on the yield reduction rate; if not, then do not issue early warning information. The method or system of the invention can improve the ability of forecasting and early warning of agricultural disasters and better accurately evaluate waterlogging disasters.

Description

technical field [0001] The invention relates to the field of disaster early warning, in particular to a method and system for early warning and evaluation of waterlogging in rice-wheat rotation farmland. Background technique [0002] China is a country with severely uneven distribution of water resources in time and space. Waterlogging disasters occur frequently in the southern region during the rainy season, which not only caused huge economic losses, but also hindered the further development of agriculture. However, people still have a serious lack of understanding of waterlogging disasters. Farmland waterlogging disasters are the result of complex effects of rainfall, underlying surface conditions, and crop response characteristics to waterlogging disasters. It is difficult to evaluate and predict. The issue of disaster assessment remains to be resolved. The rice-wheat rotation is an important crop rotation method in my country's farmland, and its area accounts for about...

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Problems solved by technology

[0004] At present, there are few studies on the prevention and control of farmland waterlogging disasters. The existing devices and methods focus more on improving existing farmland ditches and irrigation modes. For example, Chinese patent CN102031768B discloses a new type of farmland waterlogging prevention device and its application technology , but it is necessary to build multi-level drainage devices and groundwater level control devices, lack of forecast, early warning and evaluation of future waterlogging disasters, complex devices, high investment, and it is difficult to promote and use nationwide in the short term

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