Impact of Land Use changes on Runoff in a Representative ...Impact of Land Use changes on Runoff in...
Transcript of Impact of Land Use changes on Runoff in a Representative ...Impact of Land Use changes on Runoff in...
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Impact of Land Use changes on Runoff in a Representative Basin in the Semiarid of
Pernambuco State Using the SWAT Model
Authors:Robertson V. P. Fontes Júnior PPGEA - UFRPEAbelardo A. A. A. Montenegro PPGEA - UFRPE
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• Water scarcity in semi-arid regions of northeastern Brazil is a limiting factor for economic and social development factor.
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Semiarid vegetation
Wet season Dry season
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Alluvial Valleys
• Irrigation
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Objective
• The objective of this work is to investigate theimpact of land use and land cover changes onthe catchment scale using the SWAT model, mainly the desforestation impacts on wateravaliability.
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Figure 1. Location Alto Ipanema Basin in Ipanema Basin in the state of Pernambuco
Ipanema watershed
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MIMOSO SUB-BASIN
AREA - 194 km²
(SILVA, 2010)
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Figura 2. Equipaments installed: weather station(A), Rain gauges HOBO(Onset) (B),
Manual raingages (C), Data logger for levelogger and raingage (D) e Manual Ville de
Paris raingage (E).
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• Piezometers• 6 and 10 meters depth• 1 inch (diameters)• Leveloggers – 5 m depth• 10 years manual montlhy• 2 years automatic sub-daily
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Climate info
• BSsh (very hot, semiarid) - Köppen, com
• Precipitation – 730 mm total year
• Evapotranspiration – 1683 mm total year
– (MONTENEGRO & MONTENEGRO, 2006)
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Climate info
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MODELLING STUDY
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ArcSWAT 2009
SWAT-CUP
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WATERSHED DELINIATION
38 sub-basins
270 ha
SRTM – 90 X 90(EMBRAPA – site)
Area - 125 km²
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Landuse
WATER-> Açudes (Reservatórios)ARGL -> AgriculturaFRSD -> Mata GaleriaRNGB -> Mata arbustivaSWRN -> Caatinga Arb. AbertaPAST -> PastoFRST – > Caartinga Arb. FechadaURBN – > Áreas Urbanas e Areial
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Soils
EMBRAPA (1: 250,000)
•Red argisol•Red-yellow argisol•Cambisol•Regolithic neosol•Litholic neosol•Fluvic neosol•Planosol
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• Climate data
– Weather data - Estimate
– Precipitation – raingage – 2000 -> 2012
• SLOPE –
– 2, 5, 10 e 15 %
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Parameters
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Observed data
• FLOW ALL SUB-BASINS (m²/s)
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Hydrology(MONTENEGRO and RAGAB (2010)
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Add Parameters
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Hydrology
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DiCasM – SWAT (ET / PET)
• DiCasM – (Montenegro & Ragab, 2010)
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DiCasM SWAT
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Conclusions
• SWAT simulations presented promissingresults;
• Additional efforts are still required for calibration and validation ;
• Evapotranspiration is one of the key variablecontrols hydrologic processes in the basin.
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•CNPq
• FINEP
•UFRPE