Empfohlen
Empfohlen
Weitere ähnliche Inhalte
Ähnlich wie Identifying suitable areas for water harvesting in the upper Blue Nile basin, Ethiopia - Yihun Dile, Stockholm Environment Institute, Ethiopia
Ähnlich wie Identifying suitable areas for water harvesting in the upper Blue Nile basin, Ethiopia - Yihun Dile, Stockholm Environment Institute, Ethiopia (20)
Mehr von CTA
Mehr von CTA (20)
Kürzlich hochgeladen
Kürzlich hochgeladen (20)
Identifying suitable areas for water harvesting in the upper Blue Nile basin, Ethiopia - Yihun Dile, Stockholm Environment Institute, Ethiopia
- 1. WELCOME Identifying suitable areas for water harvesting in the Upper Blue Nile Basin, Ethiopa Authors: Yihun Dile Taddele , Louise Karlberg, Johan Rockström Stockholm Environment Institute
- 2. What are they? Pitting Strip catchment tillage Meskat-type system Contour bunds Semi-circular bunds Floodwater harvesting within the stream bed Ephemeral Stream Diversion Hillside sheet/rill runoff utilization
- 4. Why Water Harvesting Dry spells Flooding Drought Land degradiation
- 6. BUT?
- 8. Precipitation DEM Land Cover Soil Surface Analysis Slope map Land cover rastar map Land cover rastar map Vector to grid conversion Reclassified Precipitation Reclassified slop map Reclassified land cover Reclassified Soil Reclassifying into 5 classes WH suitability maps Weighted Overlay Analysis
- 10. Suitability Criteria Suitability values 1 2 3 4 5 Precipitation(mm) <200 >1200 200-400 800-1200 400-800 Slope(%) >20 12-20 8-12 2-8 <2 Land cover Bushland, forest N.A N.A plantations cultivated land woodland, grassland irrigated land swamp, shurbland Soil Leptosols Arenosols Vertisols Luvisols, Cambisols Regosols Acrisols, Alisols Fluvisols, Nitisols
- 11. Percent Influence Assignment Percent Influence Parameter Precipitation Slope Land use Soil Condition - 1 25 25 25 25 Condition - 2 30 30 20 20 Condition - 3 35 25 20 20 Condition - 4 25 35 20 20 Condition - 5 35 30 20 15 S = ∑w i *x i S = final suitability score; w i is weight of factor i and x i is the criterion score of factor i Suitability Analysis
- 12. Equal inflience assignment for precipitation, slope, land use and soil 30% influence assignment for Precipitation & slope, and 20% for land use & soil Results
- 13. 35%, 25%, 20% and 20% influence assignment For precipitation, slope, land use & soil resp. 25%, 35%, 20% and 20% influence assignment For precipitation, slope, land use & soil resp. Results
- 14. Results % precipitation slope 0 1 0 1 0 1 29 23 28 23 16 2 61 62 61 61 57 3 6 10 8 11 23 4 0 0 0 0 0 5 Condition-5 Condition-4 Condition-3 Condition-2 Condition-1 Suitability level
Hinweis der Redaktion
- Problems in the Upper Blue Nile: variability of rainfall; droughts; dry spells; flooding