Riverbed material renaturalization

Code: 
N08
Sector: 
Hydro Morphology
The complete description of the NWRM: 
Summary: 

Riverbed material represents the sediment eroded upstream, transported by the river and deposited on the river floor. It can be composed of coarse and/or fine material. Its re-naturalization consists in recovering the nature-like structure and composition of the bed load, in particular the equilibrium between coarse and fine sediment. In case of deficit of coarse sediment leading to river incision, the main objective is to level-up the riverbed with this type of sediment, by reactivating bank erosion in terrains contributing to this type of sediment. It should be noticed that in case of excess of fine sediment causing inundations, silting of hydro-electric dams or degradation of fish habitats, the main objective is to control erosion on slopes and riverbanks providing this type of sediment.

Illustration(s): 

Renaturalized riverbed, (France)

Source: http://www.onema.fr/Les-jeudis-de-la-restauration,1432

Explicative scheme for the principle of riverbed renaturalization (France)

Source: http://www.syndicatdelaseiche.fr/entretenir-et-restaurer-les-cours/restaurer-le-lit-des-cours-d-eau/

Possible benefits with level: 
Benefits Levelsort descending
PO1 - Improving status of biology quality elements High
PO3 - Improving status of hydromorphology quality elements High
PO7 - Prevent surface water status deterioration High
ES4 - Biodiversity preservation High
ES8 - Erosion/sediment control High
BP12 - Create aquatic habitat High
BP13 - Create riparian habitat High
PO8 - Prevent groundwater status deterioration Low
ES11 - Aesthetic/cultural value Low
BP10 - Reduce erosion and/or sediment delivery Low
PO2 - Improving status of physico-chemical quality elements Medium
PO4 - Improving chemical status and priority substances Medium
PO9 - Take adequate and co-ordinated measures to reduce flood risks Medium
PO10 - Protection of important habitats Medium
PO11 - Better protection for ecosystems and more use of Green Infrastructure Medium
PO13 - Better management of fish stocks Medium
PO14 - Prevention of biodiversity loss Medium
ES1 - Water storage Medium
ES2 - Fish stocks and recruiting Medium
ES3 - Natural biomass production Medium
ES7 - Flood risk reduction Medium
ES9 - Filtration of pollutants Medium
BP1 - Store runoff Medium
BP3 - Store river water Medium
BP4 - Slow river water Medium
BP9 - Intercept pollution pathways Medium
BP2 - Slow runoff Medium
Last updated: 08 Jun 2015 | Top