Bedforms on the Lowermost Reach of the Tiber River (Rome, Italy): Preliminary Results from Integrated Geophysical Surveys and Samplings
An ultra high-resolution multibeam survey of the lowermost reach of the Tiber River (Rome, Italy) was carried out in February 2011 on a total length of 56 km from the northernmost part of Rome city to the river mouth. The morpho-bathymetric data reveal that the main morphological features of the river bed are widespread dune fields, covering about 45 % of the surveyed area. Three main types of bedform were identified, with wavelengths ranging from a few metres up to hundreds of metres. The seismic profiles show a transparent layer(s) of 1–2 m, corresponding to a traction carpet of coarse-grained sediment, where the bedforms migrate. By integrating bathymetric data with high-resolution seismic profiling and sampling, one can better define the genesis of these bedforms and provide insights into the present-day sedimentary processes acting on the river bed.
KeywordsDune fields River floor mapping Multibeam bathymetry High-resolution seismic profiling
This study was funded by the Centro Funzionale Regionale di Protezione Civile belonging to the Regione Lazio and by the National Protection Department and was conducted in collaboration with Earth Sciences Department of the University of Rome. We gratefully thank Ing. Francesco Mele and Ing. Domenico Spina for their insightful discussion on fluvial themes. We especially thank Dr. André Fascetti, Dr. Erika Lai and Dr. Alfredo Pazzini for their valuable support during the surveys. We also thank Alan Lounds for the English revision. Finally, we want to thank the RITMARE (Ricerca ITaliana per il MARE) Project.
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