GIS-based alluvial fan analysis: a case study in the Eastern part of the North Alföld Periphery (Hungary)

In this study, we investigate the geomorphological features of the Eastern part of the North Alföld Periphery, focusing on the alluvial fans. Density mapping, aspect, directional statistical analysis, and swath profiling were applied to identify regional spatial patterns and drainage characteristics. Utilizing historical maps, satellite imagery and a digital elevation model, we digitized and analyzed the abandoned riverbeds to understand the landscape's formation, evolution and current state. The western part of the research area is primarily formed by the Tarna River alluvial fan, which exhibits complex development. The middle section, located between Hanyi-ér and Csincse, comprises coalesced alluvial fans of Bükkalja streams, shaped by the blockage from larger fans on the western and eastern edges. The Sajó-Hernád alluvial fan marks the eastern boundary. The erosion of its ancient western branch reduced the extent of the Bükkalja alluvial fan system. This research highlights the need for more detailed studies, including stratigraphy and seismic profile interpretation, to understand better the tectonic and sedimentary processes that have influenced the region's geomorphological evolution.