Case study:Lower Aurino river: Gatzaue riverbed widening: Difference between revisions
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|Name of parent multi-site project=Case_study:Lower Aurino master plan | |Name of parent multi-site project=Case_study:Lower Aurino master plan | ||
|Multi-site=Yes | |Multi-site=Yes | ||
|Project picture=Project picture.JPG | |||
|Project summary=The Aurino river is a typical Alpine watercourse (basin Area 630 km2, average discharge in summer 30-50 m3/s) affected in the past by gravel extraction, construction of bank defences along part of its course and a major reduction of sediment load from upstream, due to weirs and other protection measures in most tributaries. This determined channel incision, reduction of riverbed width, alteration of morphological structures and dynamics and as a consequence reduced connection with the floodplain, lowering of the groundwater level and loss of riparian habitats (especially hygrophilic riparian forests of Alnus incana). A major effect was also a reduced flood retention capacity, and its recovery by reverting the incision process was one of the main drivers, together with biodiversity increase, to implement a catchment scale restoration scheme. This has been carried out, step by step, for more than a decade and further measures are foreseen. | |Project summary=The Aurino river is a typical Alpine watercourse (basin Area 630 km2, average discharge in summer 30-50 m3/s) affected in the past by gravel extraction, construction of bank defences along part of its course and a major reduction of sediment load from upstream, due to weirs and other protection measures in most tributaries. This determined channel incision, reduction of riverbed width, alteration of morphological structures and dynamics and as a consequence reduced connection with the floodplain, lowering of the groundwater level and loss of riparian habitats (especially hygrophilic riparian forests of Alnus incana). A major effect was also a reduced flood retention capacity, and its recovery by reverting the incision process was one of the main drivers, together with biodiversity increase, to implement a catchment scale restoration scheme. This has been carried out, step by step, for more than a decade and further measures are foreseen. | ||
The three interventions in Gatzaue in 2005, 2009 and 2011 included removing a total of 50000 m3 of gravel from the formerly disconnected floodplain, widening the riverbed by approximately 35 m and, in order to stop incision, the construction of a ramp in 2005 and, in 2009 and 2011, the reintroduction in the same stretch of part of the gravel excavated from the river banks. A monitoring activity was implemented to study the geomorphological and biological effects of the project. | The three interventions in Gatzaue in 2005, 2009 and 2011 included removing a total of 50000 m3 of gravel from the formerly disconnected floodplain, widening the riverbed by approximately 35 m and, in order to stop incision, the construction of a ramp in 2005 and, in 2009 and 2011, the reintroduction in the same stretch of part of the gravel excavated from the river banks. A monitoring activity was implemented to study the geomorphological and biological effects of the project. | ||
Works include: Creation of new lateral habitat for fishes,amphibians and birds (alcedo atthis). | |||
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{{Image gallery}} | {{Image gallery}} | ||
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{{Measures | {{Measures | ||
|Bank and bed modifications measure= | |Bank and bed modifications measure=creation of new branches | ||
|Floodplain / River corridor=Floodplain reconnection | |Floodplain / River corridor=Floodplain reconnection | ||
|Planform / Channel pattern= | |Planform / Channel pattern=Creation of new channel, Channel widening, | ||
|Other technical measure= | |Other technical measure=Fish habitat restoration, | ||
|Social measures=Citizen participation in the restoration project, | |Social measures=Citizen participation in the restoration project, | ||
}} | }} | ||
Latest revision as of 15:11, 2 January 2019
Location: 46° 50' 55.24" N, 11° 57' 20.93" E
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Project overview
| Status | Complete |
|---|---|
| Project web site | |
| Themes | Flood risk management, Habitat and biodiversity, Hydromorphology, Social benefits, Spatial planning |
| Country | Italy |
| Main contact forename | Caterina |
| Main contact surname | Ghiraldo |
| Main contact user ID | |
| Contact organisation | Provincia Autonoma di Bolzano |
| Contact organisation web site | |
| Partner organisations | |
| This is a parent project encompassing the following projects |
Project summary
Edit project overview to modify the project summary.
The Aurino river is a typical Alpine watercourse (basin Area 630 km2, average discharge in summer 30-50 m3/s) affected in the past by gravel extraction, construction of bank defences along part of its course and a major reduction of sediment load from upstream, due to weirs and other protection measures in most tributaries. This determined channel incision, reduction of riverbed width, alteration of morphological structures and dynamics and as a consequence reduced connection with the floodplain, lowering of the groundwater level and loss of riparian habitats (especially hygrophilic riparian forests of Alnus incana). A major effect was also a reduced flood retention capacity, and its recovery by reverting the incision process was one of the main drivers, together with biodiversity increase, to implement a catchment scale restoration scheme. This has been carried out, step by step, for more than a decade and further measures are foreseen.
The three interventions in Gatzaue in 2005, 2009 and 2011 included removing a total of 50000 m3 of gravel from the formerly disconnected floodplain, widening the riverbed by approximately 35 m and, in order to stop incision, the construction of a ramp in 2005 and, in 2009 and 2011, the reintroduction in the same stretch of part of the gravel excavated from the river banks. A monitoring activity was implemented to study the geomorphological and biological effects of the project.
Works include: Creation of new lateral habitat for fishes,amphibians and birds (alcedo atthis).
Monitoring surveys and results
This case study hasn’t got any Monitoring survey and results, you can add some by editing the project overview.
Lessons learnt
This case study hasn’t got any lessons learnt, you can add some by editing the project overview.
Image gallery
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Catchment and subcatchment
Site
Project background
Cost for project phases
Reasons for river restoration
Measures
MonitoringHydromorphological quality elements
Biological quality elements
Physico-chemical quality elements
Any other monitoring, e.g. social, economic
Monitoring documents
Additional documents and videos
Additional links and references
Supplementary InformationEdit Supplementary Information
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