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A Method of Measuring the Drought Degree of Water Diversion Irrigated Area

A technology for drought and areas, applied in the fields of water resources management and disaster management, can solve the problems of not being able to reflect the impact of different factors on the irrigation area, and the impact of multiple factors on the drought in the irrigation area, etc., to achieve simple calculation process and small amount of data Effect

Active Publication Date: 2017-12-15
TSINGHUA UNIV
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  • Claims
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Problems solved by technology

The current single-factor index cannot reflect the impact of multiple factors on drought in irrigation areas; the multi-factor index that combines multiple indicators cannot reflect the correlation between different factors and their impact on irrigation areas

Method used

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  • A Method of Measuring the Drought Degree of Water Diversion Irrigated Area
  • A Method of Measuring the Drought Degree of Water Diversion Irrigated Area
  • A Method of Measuring the Drought Degree of Water Diversion Irrigated Area

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Embodiment Construction

[0042] The present invention will be described in detail below in conjunction with the accompanying drawings and examples.

[0043] The method of the present invention can be summarized as follows: firstly calculate the accumulated runoff and the accumulated irrigation water inflow, and respectively fit their probability distributions. Then, the joint probability distribution function of the two is established. Finally, based on the univariate probability distribution function and the joint probability distribution function, according to the local precipitation and irrigation water conditions in the irrigated area (such as figure 1 shown), the cumulative probability is transformed into the corresponding quantile of the normal distribution, which is the comprehensive hydrological-meteorological drought index of the water diversion irrigation area, which is recorded as CHMI (Combined Hydrological-Meteorological Index) for the convenience of expression.

[0044] The steps of the...

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Abstract

The invention discloses a method for measuring a drought degree of a water diversion irrigation region. The method comprises the following steps: obtaining a local historical precipitation amount of an irrigation region and historical runoff volume of available supplied irrigation water; determining a local accumulative precipitation amount of the irrigation region and accumulative runoff volume of the available supplied irrigation water; fitting probability distributions of the accumulative precipitation amount and the accumulative runoff volume respectively; determining a joint probability distribution function of the accumulative precipitation amount and the accumulative runoff volume; and based on a single-variable probability distribution function and a double-variable probability distribution function of accumulative precipitation and accumulative runoff, converting a corresponding accumulative probability into a corresponding quantile of standard normal distribution according to a wetness-dryness encountering condition of the accumulative precipitation and the accumulative runoff, and setting the quantile as a hydrologic-meteorological comprehensive drought index value, thereby realizing the measurement of the drought situation of the water diversion irrigation region. The method and the index provided by the invention can comprehensively reflect comprehensive influence of the local precipitation of the irrigation region and the available supplied irrigation water of the irrigation region on the drought of the irrigation region, so that the method can be widely applied to drought measurement, drought monitoring and forecasting of the water diversion irrigation region.

Description

technical field [0001] The invention relates to the fields of water resources management and disaster management, and more specifically, relates to a method for measuring drought, monitoring drought and guiding drought resistance and disaster reduction. Background technique [0002] my country is a large agricultural country, and food security is an important guarantee for social and economic stability and development. The specific monsoon climate and natural geographical environment have led to frequent droughts and severe drought losses in my country, which seriously threaten my country's food security. Major water diversion irrigation areas are the main grain producing areas in my country, and drought resistance in irrigation areas is of great significance for ensuring food production and promoting water-saving irrigation in farmland. [0003] Drought is a natural phenomenon in which the water conditions in a large area are persistently less than the local normal conditi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 许凯杨大文杨汉波秦越
Owner TSINGHUA UNIV
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