Landforms constitute boundary surfaces between different components of the earth system (atmosphere, hydrosphere, biosphere, pedosphere, lithosphere). At these locations most of the human activity on earth takes place. This central position evokes a bi-directional interaction with the other spheres of the earth system. S- tial landform structures strongly affect processes of other earth system components. At the same time, the land-surface is shaped by the in uence of these processes impacting geomorphologic processes and landform morphometry. These interactions are the focus in the Research Training Group 437 ¿Landform ¿ a structured and variable boundary layer¿ at the University of Bonn in Germany. Funded by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) the Research Training Group is a multidisciplinary research programme for postgraduate studies. Disciplines involved in this programme include: biology, c- matology, computer sciences, geodynamics, geology, geomorphology, geophysics, hydrology, mathematics, meteorology, pedology, and remote sensing. These diff- ent disciplines offer various scienti c approaches, theories, methods and data for the study of landforms within their speci c paradigms. Over a period of ten years (1998¿2008) more than 25 PhD projects have been completed. Dedicated to ongoing and completed research activities of the Research Training Group an international symposium titled ¿Landform ¿ structure, evolution, process control¿ was held at the Department of Geography, University of Bonn, in 2007.

Prof. Richard Dikau has a full professorship at the department of geography. His scientific focus includesthe study of geomorphology, geomorphometry, permafrost research and natural hazards. From 1998-2007 he was the chair of the interdisciplinary research training group 437 "Landform - a structured and variable boundary layer".

Dr. Jan-Christoph Otto works on high mountain geomorphology and sediment budgets. He is a former member of the research training group 437 "Landform - a structured and variable boundary layer" and graduated within this programme on high mountain sediment storage and sediment budgets.

Cartographic Relief Presentation Revisited ¿ Forty Years after Eduard Imhof.- New GML-Based Application Schema for Landforms, Processes and Their Interaction.- Semi-Automatic Digital Landform Mapping.- A Perona-Malik Type Method in Shape Generalization of Digital Elevation Models.- The Role of Landscape Processes within the Climate System.- The Impact of Landform Structure on the Formation of Fog ¿ Numerical Simulations with COSMO-FOG.- Influence of Drainage Parameterization and Precipitation Analysis on Discharge Simulation in the Sieg River Catchment.- Landform ¿ Hydrology Feedbacks.- Hydrological Analyses as a Prerequisite for Soil Erosion Modeling ¿ Landscape Related Studies in a Mesoscale Hydrological Catchment.- Snow Cover Duration in Relation to Topography in the Loetschental, Switzerland.- Sediment Transfer in Steep Upland Catchments (Northern England, UK): Landform and Sediment Source Coupling.- Volume Estimation, Kinematics and Sediment Transfer Rates of Active Rockglaciers in the Turtmann Valley, Switzerland.- Patterns of Multiannual Aggradation of Permafrost in Rock Walls with and Without Hydraulic Interconnectivity (Steintälli, Valley of Zermatt, Swiss Alps).- Resilience, Integrity and Ecosystem Dynamics: Bridging Ecosystem Theory and Management.- Analyzing Spatio-Temporal Hydrological Processes and Related Gradients to Improve Hydrological Modeling in High Mountains.