Basin vegetation drought occurrence remote sensing early warning and water shortage estimation method

Abstract

The embodiment of the invention discloses a basin vegetation drought occurrence remote sensing early warning and water shortage estimation method, which comprises the following steps: step 1, spatialdata processing and information extraction: extracting multi-scale basin information, vegetation type information, runoff information, rainfall information and soil moisture information; step 2, carrying out drought stress early warning, calculating a water resource quantity variable quantity and a same-period vegetation variable quantity, and carrying out drought early warning according to the instantaneous evapotranspiration index; and step 3, estimating the drought and water shortage of the vegetation, estimating the water consumption in the specific time period of the monitoring year according to the historical average water consumption for many years in the specific time period, and estimating the water shortage in the specific time period of the monitoring year. According to the method, the problems that stress early warning cannot be carried out on existing watershed vegetation drought, and the multi-scale watershed water shortage estimation precision is not high are solved.

Description

technical field [0001] The embodiments of the present invention relate to the field of ecohydrology and remote sensing, and in particular to a remote sensing early warning and water shortage estimation method for vegetation drought in a watershed. Background technique [0002] Arid areas refer to areas with little precipitation, large evaporation, and low yield. Water stress in vegetation ecosystems usually refers to the phenomenon that soil water shortage significantly inhibits vegetation growth. Water stress can also be caused by flooding, freezing, high temperature or salt damage. Water stress caused by drought and water shortage is the most common and has the greatest impact on plant water production. At present, water resources coordination and management are mostly carried out in units of river basins, sub-basins, and secondary sub-basins. [0003] Models and methods for remote sensing recognition of vegetation ecological water stress at different watershed scales. ...

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Problems solved by technology

[0006] Therefore, the embodiment of the present invention provides a remote sensing early warning and water shortage estimation method for watershed vegetation drought to solve the problems that the existing watershed vegetation drought cannot be used for stress early warning and the accuracy of water shortage estimation in multi-scale watersheds is not high.

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