Using hydro-geomorphological typologies in functional ecology: Preliminary results in contrasted hydrosystems

Stream pollution concentration in riffle geomorphic units (Yzeron basin, France)

“…Channel beds were composed of gravel, pebbles and sand. The channel was divided into different in-stream geomorphic units (riffles, pools and runs) according to previously defined characterizations (Malavoi and Souchon, 2002;Schmitt et al, 2011). The variables considered, which were assessed during low flow, were mean water height (lower for riffles), water table gradient and turbulence (both higher for riffles), and surface grain size (higher for riffles) (Fig.…”

“…Pollutant contents are much higher in the downstream reach than in to the upstream one. This can be due to stream pollution by the CSO Schmitt et al, 2011) but can also result from a globally lower Darcy flow circulation in the upstream reach. The downstream reach also shows a greater variability.…”

“…In addition, organic matter decomposition by interstitial biofilms may induce nitrate release by mineralization and nitrification (Breil et al, 2007;Grimm and Fisher, 1984;Peyrard et al, 2011). It has been shown that the higher the stream energy, the more efficient are the metabolic processes (Schmitt et al, 2011), in particular the ability of the water body to rid itself of organic matter and inorganic nitrogenous compounds, i.e. its self-purification ability, a major ecosystem service (Marmonier et al, 2012;Schmitt et al, 2011).…”

“…It has been shown that the higher the stream energy, the more efficient are the metabolic processes (Schmitt et al, 2011), in particular the ability of the water body to rid itself of organic matter and inorganic nitrogenous compounds, i.e. its self-purification ability, a major ecosystem service (Marmonier et al, 2012;Schmitt et al, 2011).…”

Co-conception of integrated flood management solutions: riverscapes to facilitate dialog

“…Brooker 1985;Plate 2002;Geilen 2004;Wohl et al 2005), so trade-offs are necessary. The increasing knowledge available on the relationships between & ECOHYDROLOGY HYDROBIOLOGY geomorphological contexts and dynamics, habitats, biodiversity, and river systems functions can really improve the design to minimize the impact on the environment and ensure aquatic habitat preservation or rehabilitation (Schmitt et al 2007;2011). Comprehensive studies of the consequences of fl ood management solutions on the river systems and extensive consultations between specialists are undertaken in research projects.…”