Method for decoupling influence of meteorological elements and vegetation dynamics on hydrological elements

Abstract

The invention discloses a method for decoupling the influence of meteorological elements and vegetation dynamics on hydrological elements. The method comprises the following steps: S1, collecting and processing input data of a distributed hydrological model; s2, integrating the vegetation dynamic data into a distributed hydrological model to improve the distributed hydrological model; s3, calibrating and verifying the improved distributed hydrological model; and S4, based on the meteorological element data, the vegetation dynamic data and the data output by the distributed hydrological model, establishing a partial least squares structure equation model, and outputting a coupling relationship among the potential variables. According to the method, a distributed hydrological model is improved, dynamic vegetation index data participates in calculation, space-time dynamic changes of vegetation are fully considered by the model, influences among meteorological elements, vegetation dynamics and hydrological elements are decoupled by utilizing a partial least square method structural equation model, and the method has important significance in understanding a complex hydrological cycle process and and provides scientific support for a management department to formulate a reasonable water distribution scheme in response to future climate changes.

Description

technical field [0001] The invention belongs to the technical field of hydrological analysis, and specifically relates to a method for decoupling the influence of meteorological elements and vegetation dynamics on hydrological elements. By using an improved distributed hydrological model, the partial least squares structural equation model (Partial Least Squares-Structural Equation Modeling, PLS-SEM) is an evaluation method that decomposes the direct or indirect impact of meteorological elements, vegetation dynamics, and hydrological elements. Background technique [0002] The influence of meteorological elements and vegetation is an important factor affecting the change of hydrological elements (evapotranspiration and runoff). Rainfall provides water for evapotranspiration and runoff. Meteorological elements such as temperature, relative humidity, sunshine and wind speed drive the emission, which also affects runoff. influences. Changes in vegetation dynamics will directly...

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Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for decoupling the influence of meteorological elements and vegetation dynamics on hydrological elements. The technical problem it solves is to output detailed hydrological elements that can reflect the dynamic temporal and spatial changes of meteorological elements and vegetation data to make up for the lack of data due to the difficulty of observing some hydrological element data, quantify the direct and indirect impacts of meteorological elements, vegetation dynamics, and hydrological elements, and consider the complex coupling mechanism between meteorological elements and vegetation dynamics. The influence of elements on hydrological elements indirectly by affecting vegetation dynamics provides an evaluation method for quantifying the complex relationship between each driving factor and hydrological elements at the watershed scale

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