1 / 22

TO PPS-PROWADIS example of the catchment audit in Italy

Università di Torino. TO PPS-PROWADIS example of the catchment audit in Italy. Aldo Ferrero, Francesco Vidotto, Fernando De Palo, Marco Milan, Marilisa Letey. Dipartimento AGROSELVITER – Università di Torino. Catchment audit in Italy: the Tiglione valley. Tanaro. Tiglione.

thisbe
Télécharger la présentation

TO PPS-PROWADIS example of the catchment audit in Italy

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Università di Torino TOPPS-PROWADIS exampleof the catchment audit in Italy Aldo Ferrero, Francesco Vidotto,Fernando De Palo, Marco Milan, Marilisa Letey Dipartimento AGROSELVITER – Università di Torino

  2. Catchment audit in Italy: the Tiglione valley Tanaro Tiglione Sub catchment about 3300 ha 2 provinces (Asti, Alessandria) 9 municipalities Tiglione catchment about 6900 ha 2 provinces (Asti, Alessandria) 17 municipalities Tiglione stream Tiglione stream lenght in the sub-catchment: 18.0 km total lenght: 25.7 km

  3. Catchment audit in Italy: the Tiglione valley Three areas selected for audit Demonstration Catchment areas (DC areas) DC1 DC2 DC3

  4. Catchment audit in Italy: demonstration catchment areas • each area includes • alluvial plain of Tiglione(both on right and left sides) • slopes Vineyards • crops • alluvialplaincereals, patches of permanentmeadows and some poplarplantations • slopes: vineyards or naturalvegetation TIGLIONE Arablecrops • accessibility • tworoadsrun ~ parallel to the twosides of Tiglione (150-300 m)

  5. Diagnosis preparation: geographical information available Collection of maps and data - Technical regional map - Orthophoto map - Water network - Slope from Digital Terrain Model (DTM) - Nature of the geological substrate - Lithological units - Permeability of the geological substrate - Topsoil texture, stoniness, reaction - Hydromorphy - Soil water holding capacity and drainage level - Capping risk - Soil destination Use of OpenSource GIS software Quantum Gis GRASS

  6. Diagnosis preparation: geographical information available GIS data processing Always >120mmno saturationexcess From 0 to 60% Mostly HIGH slope capping risk water holding capacity Runoff risk typeclassification (Aquavallée decision tree)

  7. Field diagnosis: validation Terrain survey in the demonstration catchment areas • soil characteristics • water circulation • agronomic practices • landscape factors • runoff/erosion effects

  8. Field diagnosis: validation Erosion on the hillside zone

  9. Field diagnosis: validation Concentrated runoff with erosion in thalwegs

  10. Field diagnosis: validation Sediment deposition

  11. Field diagnosis: validation Presence of short cuts (direct connection between hillside zone and river) Tiglione

  12. Field diagnosis: validation Excessive plowing depth in the alluvial zone 60 cm

  13. Field diagnosis: riparian audit Carried out on both sides of the Tiglione

  14. Field diagnosis: riparian audit Large variability of conditions • presence/absence of riparian buffer • presence/absence of shrubs and trees on the banks • soil tillage close to the bank in some fields

  15. Field diagnosis: riparian audit Large variability of conditions:landslides (lateral seepage and bare bank) Low permeability layer

  16. Audit conclusions Peculiarities of the Tiglione catchment • Presence of infiltration excess runoff mainly • Occurrence of severe erosion problems in the hillside • Serious problems of stability along the Tiglione banks • Several short-cuts • Diffuse adoption of plowing carried out in autumn at an excessive depth

  17. Proposed actions Riparian zone • Introduction of riparian buffer zone with reinforcement of the banks • Adoption of dispersion structures (e.g. brushwood fascines) at the end of shortcuts Alluvial plain • Adoption of shallow plowing • Use of cover crops • Avoid seeding too close to the river banks • Favor the growth of herbaceous vegetation in the shortcuts Hillside zone • Promote growth of herbaceous vegetation (either spontaneous or seeded) in the inter-row • New plantations (vineyard) perpendicular to the slope • Reduce vulnerability to runoff/erosion of the access roads

  18. Proposed actions: RIPARIAN ZONE Grassed buffer strip and tree vegetation

  19. Proposed actions: RIPARIAN ZONE Dispersion structures: fascines, wooden barriers, etc.

  20. Proposed actions: HILLSIDE ZONE grassed drainage ditch (with barriers) BETWEEN the tracks

  21. Next steps • Meetings with local farmers and authorities to involve them and gather additional information • Implementation of BMPs in the most critical situations • Demonstration/training activities into the selected catchment area with national stakeholders

  22. Thanks

More Related