Un outil de caractérisation hydromorphologique des cours d’eau pour l’application de la DCE en France (CARHYCE)

The anthropogenic nature of present-day low energy rivers in western France and implications for current restoration projects

“…In summary, for low energy channels inherited from a dynamic of Stable Bed Aggrading Banks type (Brown and Keough, 1992), the height, nature and method of bank management remain fundamental to understand modern sediment yield and the lateral dynamics of the channel. The CARHYCE database will undoubtedly help to build useful reference modes for the river managers (Gob et al, 2014) but many restoration works are currently in progress and planned without suitable knowledge of low energy rivers.…”

Evaluation of long-term bedload virtual velocity in gravel-bed rivers (Ardenne, Belgium)

“…(1)) of the flow events in the different reaches, the local slope (s in m m −1 ) was estimated from topographical surveys of the highest water marks after flow events close to bankfull discharge. The width (w in m) corresponds to the mean of at least ten field measurements at the bankfull stage on a sector length corresponding to at least 14 times the bankfull width in order to cover at least two riffle-pool sequences (Leopold et al, 1964;Gob et al, 2014). Study sites were selected close to gauging stations in order to use accurate discharge data (Q in m 3 s −1 ).…”

LiDAR‐based fluvial remote sensing to assess 50–100‐year human‐driven channel changes at a regional level: The case of the Piedmont Region, Italy

“…height above a low flow channel; see the following section), Active Channel Width (ACW), and Low Flow water Channel Width (LFCW). The existence of power relationships among discharge, channel depth and width has been extensively debated in the literature, part of which is referred to as hydraulic geometry (Leopold and Wolman, 1957;Pistocchi and Pennington, 2006;Parker et al, 2007;Nanson and Huang, 2008;Gob et al, 2014). The exponents of these Hydraulic Scale Laws (hereafter referred to in the text as HSLs) are influenced by geological and climate context and ultimately affect channel geometry and typology.…”

“…They therefore minimized the size-dependency effect, following the approach of Piégay et al (2009), and were able to more effectively compare different channel conditions in terms of occurred processes. Gob et al (2014) measured possible channel geometry alterations (e.g. depth or flow width), comparing altered and relatively unaltered channel conditions, the latter of which were derived from a set of reference river reaches that were judged to have been relatively unaffected by recent human pressures.…”