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  • Deep-seated, complex tunnel systems. A hydrological study in a semi-arid catchment, Loess Plateau, China
  • A monitoring program was conducted during 1989 and 1990 in the Yangdaogou, a small subbasin of the Loess Plateau in North China, and all of the tunnel outlets observed to be active were investigated. The preliminary results on tunnel flow hydrology
  • of subsurface erosion apart from solution : true piping in the engineering sense and tunnel erosion.