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The groundwater responses to loess flowslides in the Heifangtai platform

  • Ling Xu
  • Dongdong YanEmail author
Original Paper
  • 107 Downloads

Abstract

Due to the large area of agricultural irrigation on the Chinese Loess Plateau, the groundwater table has been significantly raised, resulting in dozens of flowslides in the Heifangtai loess platform, Gansu Province. The groundwater responses to flowslides in Heifangtai were investigated by field investigation and numerical modelling. These landslides happened at backscarps of the early landslides, indicating a geomorphological evolution. On this basis, the platform conditions in future can be evaluated, therefore, to establish the numerical model for groundwater simulation. The simulation results indicate that the continuous occurrences of flowslides can influence the hydrological boundaries of the groundwater system. It then improves the drainability of the platform by enlarging the seepage areas of the platform and decreases the total groundwater recharge by decreasing the irrigation areas of the platform. For a given irrigation intensity, the perched groundwater table firstly increases to a peak value and then decreases to an approximately steady state, close to the level in 2004. At that time, the accumulative volume of flowslides was up to about 4,600 × 104 m3. After taking into account that the perched groundwater table in 2004 was still high enough to trigger flowslides, the rest area of Heitai (the modelled platform) is predicted to be largely reduced to at least less than 7.8 km2 and will decrease continuously. Landslide risk in Heifangtai would be very high for a long time if no effective measures are adopted for irrigation control.

Keywords

Loess landslide Perched groundwater system Geomorphologic evolution 

Notes

Acknowledgements

The financial support by National Nature Science Foundation of China (NSFC) (Project Nos. 41472276 and 41530640) is acknowledged.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Civil Engineering, School of Human Settlements and Civil EngineeringXi’an Jiaotong UniversityXi’anChina
  2. 2.Department of Geotechnique and Tunnelling, School of HighwayChang’an UniversityXi’anChina

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