On the Morphological Impacts of Gravel Mining: The Case of the Orco River
Gravel mining may induce deep changes in river morphology including bank instabilities, downstream as well upstream bed incision. In the present work, morphological changes due to a large sediment mining in the Orco river (a tributary of the Po river, located in the Piemonte Region) are documented and modeled. The river mining occurred in 2003–2004, a volume of about 130,000 m3 of sediment was extracted over a surface of about 70,000 m2 at about 25 km upstream the confluence with the Po river. The mining and the response of the river to this intervention is well-documented through an experimental methodology developed by the CNR-IRPI and based on four distinct LIDAR surveys realized in the years 2003, 2004, 2006 and 2007. The observed morphological changes that occurred immediately after the gravel extraction in the time period 2004–2006 were then reproduced using the hydro-morphological 1D model BASEMENT developed by the ETH (www.basement.ethz.ch). Results indicate the model is able to capture not only the depositional and erosional areas, but it also provides a good estimate of the volume of sediment mobilized.
KeywordsGravel mining Lidar surveys Morphological modeling
- Bisson PA et al (1987) Large woody debris in forested streams in the pacific northwest: past present, and future. In: Salo EO, Cundy T (eds) Proceedings of an interdisciplinary symposium on stream-side management: Forestry and fishery interactions. University of Washington Press, Seattle, pp 143–190Google Scholar
- Harvey MD, Schumm SA (1987) Response of dry creek, california, to land use change, gravel mining and dam closure. In: Erosion and sedimentation in the Pacific Rim, proceedings of the Corvallis symposium, August 1987. International Association of Hydrological Sciences Publication 165, pp 451–460Google Scholar
- Meyer-Peter E, Müller R (1948) Formulas for bed-load transport. In: Proceedings of the 2nd Congress IAHR, Stockholm, SwedenGoogle Scholar
- Scott KM (1973) Scour and fill in Tujunga wash -a fanhead valley in urban southern California- 1969. US Geological Survey Professional Paper 732-BGoogle Scholar
- Stevens MA, Urbonas B, Tucker LS (1990) Public– private cooperation protects river. APWA Reporter September, 25–27Google Scholar