1. 64
  2. Hydromorphology

Hydromorphology

Shifting of the bed

Updated on 08/04/2020
Définition
Sens technique

Lateral movements of the minor riverbed within the boundaries of the floodplain or delta of the watercourse and which create the free space of the watercourse.

Source
According to Ministry of the Environment and OFB

Grid

Updated on 26/10/2022
Définition
Sens commun
Fixed or mobile structure, situated downstream and/or upstream of a fish farm, preventing the free circulation of fish.
Source
According to OFB and IOWater

Bank

Updated on 13/07/2018
Définition
Sens commun
Edge of a river (not to be misunderstood with "shore", the seaside). We distinguish the right bank (looking in the direction of the river flow - from upstream to downstream), the right bank is on the right) from the left bank looking in the direction of…
Source
According to Ifremer

Lock

Updated on 04/07/2018
Définition
Sens commun
Chamber limited on both sides by side walls and, at the front and rear, by gates which allow passing between two different levels of water.
Source
According to Adour-Garonne Water Agency

Hyporheic zone

Updated on 26/10/2022
Définition
Sens technique
All water saturated sediments, located beneath and alongside a stream, containing a certain amount of surface water. If the stream flows over impermeable bedrock, it will not develop a hyporheic zone. The hyporheic zone may exclusively consist of surface water (case of streams perched above the alluvial groundwater) or characterized by a mixture of surface water and groundwater (when there are exchanges with groundwater). These different configurations are found along the same stream,
Source
According to OFB

Response variable

Updated on 13/07/2018
Définition
Sens technique
Degree of freedom available to the river to perform its basic functions, i.e. carry the liquid flow and sediment load. They are geometrical parameters (width, depth, bottom slope, amplitude and length of the meanders), size of transported sediments, current velocity.
Source
According to Cemagref

Control variable

Updated on 13/07/2018
Définition
Sens technique
Variable used to control rivers, broadly imposed by geology and climate: e.g. liquid flow, solid flow, geometry of the valley (slope in particular), nature of the forest cover in the catchment area, particle sizes and mechanical properties of the river bed and
Source
According to Cemagref

Braid

Updated on 26/10/2022
Définition
Sens commun
Shifting space of the low-water channel of a watercourse with several arms constantly changing.
Source
According to OFB

Sediment transport

Updated on 13/07/2018
Définition
Sens commun
Sediment transport (particles, clay, silt, sand, gravel, etc) in rivers can be done either by suspension in water, or by moving on the bed bottom due to the tractive forces linked to the current.
Source
According to Rhone-Mediterranean and Corsica Water Agency

River basin head

Updated on 13/07/2018
Définition
Sens commun

The most upstream area of a watershed territory. The river basin head is the land where the small streams close to springs flow through.

Source
according to IOWater
Sens technique

Upstream portion of the catchment areas and by extension the upstream section of rivers which, in hilly areas in particular, are often less exposed to anthropogenic pressures than the downstream parts (but still very fragile) and from this point of view are reference sections to be preserved.

Source
According to Rhone-Mediterranean and Corsica Water Agency