The response mechanism of geomorphological evolution and hydrological process in Loess Platform
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Abstract:
Due to the large area of agricultural irrigation in the Loess Plateau,the groundwater table in the plateau has been greatly increased and a large number of landslides have been induced.In the Heifangtai region of Gansu Province,dozens of loess landslides caused by irrigation has occurred.This paper studies the response law of landslide hazard and groundwater in Heifangtai region through field investigation and numerical simulation.The landslide in Heifangtai region has obvious geomorphological evolution characteristics.On this basis,the numerical model of Heitai platform hydrogeology is established.The simulation results show that the occurrence of loess landslide will affect the boundary conditions of the groundwater system,and increase the drainage of the Heitai groundwater system through the expanding seepage face.At the same time,because the irrigated area becomes smaller,the total recharge of the groundwater system is reduced.For a fixed recharge amount,the groundwater phreatic level first peaked with the continuation of the landslide,and then decreased to a level close to the 2004 level,and the cumulative volume of the landslide reached 4 600×104 m3.Considering that the groundwater level in 2004 is still high enough to cause landslides,the area of the Heitai will be reduced by less than 7.8 km2.If effective measures are not taken,the landslide will continue to occur and the risk of landslide disasters in the study area will continue for a long time.
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