Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Spatial delineation of soil erosion vulnerability in the Lake Tana Basin, Ethiopia
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik, Vattendragsteknik.
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik, Vattendragsteknik.ORCID-id: 0000-0002-2342-2068
2009 (engelsk)Inngår i: Hydrological Processes, ISSN 0885-6087, E-ISSN 1099-1085, Vol. 23, nr 26, s. 3738-3750Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The main objective of this study was to identify the most vulnerable areas to soil erosion in the Lake Tana Basin, Blue Nile, Ethiopia using the Soil and Water Assessment Tool (SWAT), a physically based distributed hydrological model, and a Geographic Information System based decision support system that uses multi-criteria evaluation (NICE). The SWAT model was used to estimate the sediment yield within each sub-basin and identify the most sediment contributing areas in the basin. Using the NICE analysis, an attempt was made to combine a set of factors (land use, soil, slope and river layers) to make a decision according to the stated objective. On the basis of simulated SWAT, sediment yields greater than 30 tons/ha for each of the sub-basin area, 18.4% of the watershed was determined to be high erosion potential area. The NICE results indicated that 12-30.5% of the watershed is high erosion potential area. Both approaches show comparable watershed area with high soil erosion susceptibility. The output of this research can aid policy and decision makers in determining the soil erosion 'hot spots' and the relevant soil and water conservation measures. (C) Copyright 2009 John Wiley & Sons, Ltd.

sted, utgiver, år, opplag, sider
2009. Vol. 23, nr 26, s. 3738-3750
Emneord [en]
soil erosion, Lake Tana, SWAT, MCE, GIS, hydrologic modeling, NONPOINT-SOURCE POLLUTION, WATER ASSESSMENT-TOOL, SWAT MODEL, MULTICRITERIA EVALUATION, CALIBRATION, PARAMETERS, HYDROLOGY, TRANSPORT, CRITERIA
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-12020DOI: 10.1002/hyp.7476ISI: 000273438100011Scopus ID: 2-s2.0-76149099237OAI: oai:DiVA.org:kth-12020DiVA, id: diva2:294401
Merknad
QC20100719Tilgjengelig fra: 2010-02-17 Laget: 2010-02-17 Sist oppdatert: 2020-01-02bibliografisk kontrollert
Inngår i avhandling
1. Modelling Hydrological and Hydrodynamic Processes in Lake Tana Basin, Ethiopia
Åpne denne publikasjonen i ny fane eller vindu >>Modelling Hydrological and Hydrodynamic Processes in Lake Tana Basin, Ethiopia
2010 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Lake Tana Basin is of significant importance to Ethiopia concerning water resources aspects and the ecological balance of the area. The growing high demands in utilizing the high potentials of water resource of the Lake to its maximal limit, pictures a disturbing future for the Lake. The objective of this study was to assess the influence of topography, soil, land use and climatic varia-bility on the hydrological and hydrodynamic processes of the Lake Tana Basin. The physically based SWAT model was successfully calibrated and validated for flow and sediment yield. Se-quential uncertainty fitting (SUFI-2), parameter solution (ParaSol) and generalized likelihood un-certainty estimation (GLUE) calibration and uncertainty analysis methods were compared and used for the set-up of the SWAT model. There is a good agreement between the measured and simulated flows and sediment yields. SWAT and GIS based decision support system that uses multi-criteria evaluation (MCE) was used to identify the most vulnerable areas to soil erosion in the basin. The results indicated that 12 to 30.5% of the watershed is high erosion potential. Pro-jected changes in precipitation and temperature in the basin for two seasons were analyzed using outputs from fifteen global climate models (GCMs). A historical-modification procedure was used to downscale large scale outputs from GCM models to watershed-scale climate data. The results showed significant changes in streamflow and other hydrological parameters in the period between 2045-2100. SWAT was combined with a three dimensional hydrodynamic model, GEMSS to investigate the flow structure, stratification, the flushing time, lake water balance and finally the Lake‘s water level response to planned water removal. We have found an alarming and dramatic fall of the water levels in Lake Tana as response to the planned water withdrawal. The combination of the two models can be used as a decision support tools to better understand and manage land and water resources in watersheds and waterbodies. The study showed that the Lake Tana Basin may experience a negative change in water balance in the forthcoming decades due to climate change as well as over abstraction of water resources.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2010. s. viii, 66
Serie
Trita-LWR. PHD, ISSN 1650-8602 ; 1057
Emneord
Lake Tana, Climate Change, SWAT, Hydrological Modeling, Hydrodynamic, GEMSS, MCE, Streamflow, Sediment yield
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-12024 (URN)978-91-7415-558-7 (ISBN)
Disputas
2010-03-05, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:15 (engelsk)
Opponent
Veileder
Merknad
QC 20100720Tilgjengelig fra: 2010-02-17 Laget: 2010-02-17 Sist oppdatert: 2018-01-12bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fulltekstScopusHydrological Processes

Søk i DiVA

Av forfatter/redaktør
Setegn, Shimelis GebriyeDargahi, Bijan
Av organisasjonen
I samme tidsskrift
Hydrological Processes

Søk utenfor DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 201 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf