Drought early-warning method and drought early-warning system

Abstract

The invention discloses a drought early-warning method. The drought early-warning method includes acquiring plant distribution information of crops in an early-warning area; acquiring information of weather forecasting and the like in the early-warning area; calculating actual evapotranspiration of the crops; calculating to acquire relative water content in a planned moist layer in soil according to information of the actual evapotranspiration of the crops and the like; and comparing the relative water content in the planned moist layer in soil and lower limit of a drought threshold value, and judging drought degree of the crops. Therefore, information from multiple types of sources, such as growth condition of the crops, water in soil, weather forecasting information, geographic information in the early-warning area, is considered comprehensively, the drought degree of the crops is judged, and accordingly early warning of drought of the crops is more accurate and reasonable, and unreasonable utilization and waste of water resources are unlikely to cause during irrigation. Finally, related information of the drought degree of the crops and the like is used to generate and display a space distribution map by a geographic information system, and accordingly optimized allocation of the water resources in agriculture and early warning of drought in an area range are achieved.

Description

technical field [0001] The invention relates to the field of natural disaster prediction, and more specifically, relates to a drought early warning method and early warning system. Background technique [0002] Drought is a relatively special natural disaster, its main characteristics are long duration, wide spread and difficult governance. Drought is a common natural disaster in the world. More than 120 countries and regions are threatened by drought disasters to varying degrees every year. my country is one of the countries suffering from drought disasters. Therefore, the early warning of meteorological drought and soil drought is particularly urgent. [0003] Drought early warning is to analyze the degree of drought in the early stage based on the causes of drought and the law of drought occurrence, and predict the time, scope and intensity of future droughts in combination with changes in weather and meteorological elements in the future, and determine the issuance of d...

AI Technical Summary

Problems solved by technology

Although a lot of research on drought early warning has been carried out at home and abroad, there is still a lack of effective methods at home and abroad for regional drought early warning based on comprehensive consideration of meteorology, soil and the growth and development of different crops.

[0004] The traditional drought early warning method only relies on a single meteorological or soil information to give early warning of the drought degree in a certain early warning area, while crop drought is not only affected by the climate conditions in the early warning area, but also by crop growth status, soil type, and soil moisture status. For a certain early warning area or irrigation area, the same soil moisture status, different crops or even different growth stages of the same crop will have different water shortages. If only meteorological or soil drought indicators are considered, it may be causing some crops to be underwatered and others to be overwatered

Therefore, if meteorology, soil, crop growth and development, and weather forecast information are not comprehensively considered for drought warning and rational allocation of water resources, it will result in unreasonable and wasteful use of water resources

[0005] Moreover, the traditional drought early warning is only for a single field and cannot accurately reflect the degree of drought in a certain area. Therefore, it is impossible to carry out drought and disaster prevention work within the region in a timely manner.

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