The geomorphology-hydro-ecology day will provide an insight into how to carry out a geomorphological diagnosis of gravel-bottomed rivers, and the stages involved in monitoring restoration operations. It will also provide an opportunity to discover the consequences of geomorphological changes on various river compartments, such as groundwater and riparian vegetation. The day will provide an opportunity to discover the aquatic species adapted to this type of environment and the pressures to which they are exposed as a result of hydroelectric development. It will also provide an opportunity to learn about the hydraulic habitat modelling tools developed by ZABR.
Speakers
11.00
Introduction to the environmental context of the Ain by major compartments, assessment of recent morphological changes and interpretation of their causes
Knowing how to gather historical data, put it together, analyse it and formulate hypotheses, knowing how to observe, knowing how to establish a geomorphological diagnosis using topo / diachronic aerial images / granulometry.
Speakers: Hervé Piégay, EVS and Fanny Arnaud, EVS
11.30
Evaluer les conséquence des changements (ripisylve, échange avec la nappe)
Effects of morphological changes on riparian vegetation (hydric stress); links between water table and river, method for detecting phreatic inflows
Speakers: Hervé Piégay, EVS and Fanny Arnaud, EVS
12.15
Restoration (sediment balance, design and monitoring of recharge)
Measurement of solid transport, assessment of the quantities required for recharge, available sources, monitoring strategy (introduction to questions for defining restoration objectives, sizing, sustainability and efficiency)
Speakers: Hervé Piégay, EVS and Fanny Arnaud, EVS
13.00 Lunch
14.30
Aquatic organisms and human development
Reminder of key biotic compartments, life cycle - habitat link, adaptations (traits) (bio / phenology) typical of environments with strong currents, constraints imposed by anthropogenic pressures (presence of dams, management of rivers by hydropeaking), the different dimensions of ecological connectivity
Speaker: Maria Alp, INRAE RiverLy
15.30
Discovering operational tools for defining ecological flows: hydraulic habitat models
Introduction to habitat models (20 min + 10 min questions) + Practical work: modelling exercise using data from the Ain (1 hour)
Speaker: Nicolas Lamouroux, INRAE RiverLy
17.00
How advanced three-dimensional computational fluid dynamics can be useful for ecologists?
Speaker: George Constantinescu
