IMIS

A new integrated search interface will become available in the next phase of marineinfo.org.
For the time being, please use IMIS to search available data

 

[ report an error in this record ]basket (0): add | show Print this page
Sediment transport processes during flood events in the Middle Loire: gauging and first results
Gautier, J.N.; Rodrigues, S.; Jugé, P.; Peters, J.J. (2008). Sediment transport processes during flood events in the Middle Loire: gauging and first results. Geophys. Res. Abstr. 10(EGU2008-A-00000): [1]
In: Geophysical Research Abstracts. Copernicus: Katlenburg-Lindau. ISSN 1029-7006; e-ISSN 1607-7962, more
Peer reviewed article  
Available in  Authors 
Keywords
    Earth sciences > Geology > Geomorphology
    Gauging
    Hazards > Weather hazards > Floods
    Monitoring
    Transport > Sediment transport
    France, Pays de Loire, Loire R.
Author keywords
    River channels
Event Top | Authors 
  • General Assembly of the European Geosciences Union EGU, more
Project Top | Authors 
  • Loire river sediment studies, more
Authors  Top 
  • Gautier, J.N.
  • Rodrigues, S.
  • Jugé, P.
  • Peters, J.J., more
Abstract
    hydraulic and sediment transport survey campaign was organised in March 2007 on the Loire River, at the Bréhémont site. The aim was to collect data useful for the understanding of fluviomorphological mechanisms. A survey procedure, established at the end of the 1960's and relying on a follow-up bathymetric surveys and ancient sediments samplers was combined with modern technologies such as DGPS satellite positioning and ADCP flow gauging. The survey campaign allowed quantifying the sediment transport rates of the size fractions larger than 50 microns. The results confirm the earlier made hypothesis concerning the existence of a sediment load moving close to the bottom and distinct from the suspended load as described in the theories. This load was called "morphological" and is composed of solids having sizes between those of the river bed and those moving in suspension at higher elevations. This statement, made on the basis of surveys on other large streams in Africa, Asia and the America's questions the concepts on which have been based the majority of the sediment transport theories. The analysis shows also that the rate of bedload transport can be very high up to 60% in some verticals and nearly 50% on all a profil, that is much more than the rate usually admits. The present surveys show that campaigns as these are necessary in order to comprehend the processes, a condition prior to investigating solutions.
All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors