Runoff change attribution recognition method considering land utilization spatial-temporal evolution

Abstract

The invention discloses a runoff change attribution recognition method considering land utilization spatial-temporal evolution. The method comprises the steps that a research period is divided into a natural period and a change period according to runoff sudden change characteristics; the change period is segmented according to land utilization evolution characteristics; a basin SWAT model is established; model parameters are calibrated; and basin runoff change is calculated in a segment-by-segment item-by-item rolling and attribution quantification mode. Through the method, the change period is finely divided according to the evolution characteristics of land utilization to fully consider land utilization evolution conditions, basin underlying surface characteristics can be accurately described and hydrologic process characteristics can be effectively simulated based on the SWAT model, a basin distributed hydrologic model is established to describe the hydrologic process, and influences of land utilization evolution on runoff are fully considered in an attribution quantification recognition result obtained by calculating the runoff change in the basin research period in a segment-by-segment item-by-item rolling mode.

Description

technical field [0001] The invention relates to the attribution identification technology of watershed runoff change in the field of water conservancy engineering, in particular to a runoff change attribution identification method considering the temporal and spatial evolution of land use. Background technique [0002] In the past 100 years, affected by global warming, the hydrological cycle has intensified, and the frequency and intensity of extreme runoff events have increased to a certain extent. The continuous enhancement of social and economic activities and the construction of high-density water conservancy projects have formed a complex impact chain of human activities. Studies have shown that among many human activities, land use changes have changed the underlying surface conditions, thereby changing the production and sink conditions, and affecting the runoff. Change has played a particularly pronounced role. For a long time, the historical runoff sequence and sup...

AI Technical Summary

Problems solved by technology

Since the distributed hydrological model can describe the spatial information of the watershed, it is widely used in the identification of runoff change attribution. The usual practice is to use one-period land use data instead of a whole period of modeling, which cannot consider the temporal and spatial evolution of land use, especially It is a period of drastic changes in human activities

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