Abstract
Water induced loess landslides are closely related to the rise of the groundwater level. Therefore, research on the response of the groundwater level to irrigation water holds promise for revealing the mechanism of water-induced loess landslide. Taking Heitai, Gansu Province, as the research area, a coupling model o unsaturated-saturated water movement is established using the HYDRUS-MODFLOW software. The parameters of the model are calibrated and verified by the Bayesian parameter inversion method combined with field observations of the groundwater level. Finally, the change in the groundwater level under different irrigation amounts is predicted using the optimized model. It is found that a reasonable reduction of the irrigation amount can effectively slow the rise of the groundwater level. This research provides a scientific reference for the development of reasonable irrigation measures.
Highlights
Loess is a special deposit that is formed in the Quaternary with weak cementation and is widely distributed throughout the world
The HYDRUS model focuses on the simulation of soil water in the unsaturated zone, and the MODFLOW model mainly simulates the movement process of groundwater in the saturated zone
0.8 times the original irrigation amount, the contour of the groundwater level obviously shifts right, that is, the groundwater level rises with time
Summary
Loess is a special deposit that is formed in the Quaternary with weak cementation and is widely distributed throughout the world. SWAT and the groundwater model MODFLOW, the flow flux between the layers of the unsaturated zone is calculated by the water balance equation [16,17]. MODFLOW-VSF is a three-dimensional saturated-unsaturated flow coupling model that uses the Richards equation to accurately describe the flow movement in the unsaturated zone, which can ensure high simulation accuracy [23].
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