TY - JOUR A1 - Wienhöfer, Jan A1 - Lindenmaier, Falk A1 - Zehe, Erwin T1 - Challenges in understanding the hydrologic controls on the mobility of slow-moving landslides JF - Vadose zone journal N2 - Slow-moving landslides are a wide-spread type of active mass movement, can cause severe damages to infrastructure, and may be a precursor of sudden catastrophic slope failures. Pore-water pressure is commonly regarded as the most important among a number of possible factors controlling landslide velocity. We used high-resolution monitoring data to explore the relations of landslide mobility and hydrologic processes at the Heumoser landslide in Austria, which is characterized by continuous slow movement along a shear zone. Movement rates showed a seasonality that was associated with elevated pore-water pressures. Pore pressure monitoring revealed a system of confined and separated aquifers with differing dynamics. Analysis of a simple infinite slope mobility model showed that small variations in parameters, along with measured pore pressure dynamics, provided a perfect match to our observations. Modeling showed a stabilizing effect of snow cover due to the additional load. This finding was supported by a multiple regression model, which further suggested that effective pore pressures at the slip surface were partially differing from the borehole observations and were related to preferential infiltration and subsurface flow in adjacent areas. It appears that in a setting like the Heumoser landslide, hydrologic processes delicately influence slope mobility through their control on pore pressure dynamics and the weight of the landslide body, which challenges observation and modeling. Moreover, it appears that their simplicity, and especially their high sensitivity to parameter variations, limits the conclusions that can be drawn from infinite slope models. Y1 - 2011 U6 - https://doi.org/10.2136/vzj2009.0182 SN - 1539-1663 VL - 10 IS - 2 SP - 496 EP - 511 PB - Soil Science Society of America CY - Madison ER - TY - JOUR A1 - Wienhöfer, Jan A1 - Lindenmaier, Falk A1 - Ihringer, Jürgen A1 - Zehe, Erwin T1 - Characterization of soil hydraulic properties on a creeping Alpine slope Y1 - 2009 SN - 978-1-901502-89-3 ER - TY - THES A1 - Wienhöfer, Jan T1 - On the role of structure-process interactions in controlling terrestrial systems : an exemplare of hillslope hydrology and a slow-moving landslide Y1 - 2014 CY - Potsdam ER - TY - JOUR A1 - Loritz, Ralf A1 - Hassler, Sibylle K. A1 - Jackisch, Conrad A1 - Allroggen, Niklas A1 - van Schaik, Loes A1 - Wienhöfer, Jan A1 - Zehe, Erwin T1 - Picturing and modeling catchments by representative hillslopes JF - Hydrology and earth system sciences : HESS N2 - This study explores the suitability of a single hillslope as a parsimonious representation of a catchment in a physically based model. We test this hypothesis by picturing two distinctly different catchments in perceptual models and translating these pictures into parametric setups of 2-D physically based hillslope models. The model parametrizations are based on a comprehensive field data set, expert knowledge and process-based reasoning. Evaluation against streamflow data highlights that both models predicted the annual pattern of streamflow generation as well as the hydrographs acceptably. However, a look beyond performance measures revealed deficiencies in streamflow simulations during the summer season and during individual rainfall-runoff events as well as a mismatch between observed and simulated soil water dynamics. Some of these shortcomings can be related to our perception of the systems and to the chosen hydrological model, while others point to limitations of the representative hillslope concept itself. Nevertheless, our results confirm that representative hillslope models are a suitable tool to assess the importance of different data sources as well as to challenge our perception of the dominant hydrological processes we want to represent therein. Consequently, these models are a promising step forward in the search for the optimal representation of catchments in physically based models. Y1 - 2017 U6 - https://doi.org/10.5194/hess-21-1225-2017 SN - 1027-5606 SN - 1607-7938 VL - 21 IS - 2 SP - 1225 EP - 1249 PB - Copernicus CY - Göttingen ER - TY - JOUR A1 - Wienhöfer, Jan A1 - Lindenmaier, Falk A1 - Zehe, Erwin T1 - Temporal variability of a slow-moving landslide : the Heumöser Hang case study in Vorarlberg, Austria Y1 - 2009 UR - http://eost.u-strasbg.fr/omiv/Conference_Landslide_Processes.html SN - 2-9518317-1-4 ER -