Print Email Facebook Twitter Characterization of groundwater dynamics in landslides in varved clays Title Characterization of groundwater dynamics in landslides in varved clays Author Van der Spek, J.E. Bogaard, T.A. Bakker, M. Faculty Civil Engineering and Geosciences Department Water Management Date 2013-06-07 Abstract Groundwater dynamics may play a significant role in landslides. A detailed model is developed of the groundwater dynamics in landslides in varved clays in the Trieves area in the French Alps. The varved clays consist of a sequence of alternating silt and clay layers, covered by a colluvium layer and intersected by fissures. The hydraulic conductivity of the clay layers is negligible compared to the silt layers. It is conceptualized that fissures form a hydraulic connection between the colluvium and the varved clays. Groundwater recharge flows through the colluvium into the fissures, where water is exchanged horizontally between the fissure and the silt layers of the varved clays. Groundwater flow in the colluvium is simulated with the Boussinesq equation, while flow in the silt layers of the varved clays is simulated with the Richards equation. Longitudinal outflow from the fissure is simulated with a linear-reservoir model. Scattered data of relatively short monitoring periods is available for several landslides in the region. A good similarity between observed and simulated heads is obtained, especially when considering the lack of important physical parameters such as the fissure width and the distance between the monitoring point and the fissure. A simulation for the period 1959–2004 showed some correlation between peaks in the simulated heads and the recorded occurrence of landslides, while the bottom of the varved clays remained saturated during the entire simulation period. Subject OA-Fund TU Delft To reference this document use: http://resolver.tudelft.nl/uuid:9903b2fb-45c1-424f-a232-9e6ce1741f50 DOI https://doi.org/10.5194/hess-17-2171-2013 Publisher European Geosciences Union (EGU) ISSN 1027-5606 Source http://www.hydrol-earth-syst-sci.net/17/2171/2013/ Source Hydrology and Earth System Sciences, 17 (6), 2013 Part of collection Institutional Repository Document type journal article Rights © 2013 The Author(s)CC Attribution 3.0 License Files PDF vanderSpek_2013.pdf 2.22 MB Close viewer /islandora/object/uuid:9903b2fb-45c1-424f-a232-9e6ce1741f50/datastream/OBJ/view