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
• Water scarcity in semi-arid regions of northeastern Brazil is a limiting factor for economic and social development factor.
Semiarid vegetation
Wet season Dry season
Alluvial Valleys
• Irrigation
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.
Figure 1. Location Alto Ipanema Basin in Ipanema Basin in the state of Pernambuco
Ipanema watershed
MIMOSO SUB-BASIN
AREA - 194 km²
(SILVA, 2010)
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).
A.
B.
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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
Climate info
• BSsh (very hot, semiarid) - Köppen, com
• Precipitation – 730 mm total year
• Evapotranspiration – 1683 mm total year
– (MONTENEGRO & MONTENEGRO, 2006)
Climate info
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R (1961-1999) R (2002-2007) PE
MODELLING STUDY
ArcSWAT 2009
SWAT-CUP
WATERSHED DELINIATION
38 sub-basins
270 ha
SRTM – 90 X 90(EMBRAPA – site)
Area - 125 km²
Landuse
WATER-> Açudes (Reservatórios)ARGL -> AgriculturaFRSD -> Mata GaleriaRNGB -> Mata arbustivaSWRN -> Caatinga Arb. AbertaPAST -> PastoFRST – > Caartinga Arb. FechadaURBN – > Áreas Urbanas e Areial
Soils
EMBRAPA (1: 250,000)
•Red argisol•Red-yellow argisol•Cambisol•Regolithic neosol•Litholic neosol•Fluvic neosol•Planosol
• Climate data
– Weather data - Estimate
– Precipitation – raingage – 2000 -> 2012
• SLOPE –
– 2, 5, 10 e 15 %
Parameters
Observed data
• FLOW ALL SUB-BASINS (m²/s)
Hydrology(MONTENEGRO and RAGAB (2010)
Add Parameters
Hydrology
DiCasM – SWAT (ET / PET)
• DiCasM – (Montenegro & Ragab, 2010)
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ET / PET
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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.
•CNPq
• FINEP
•UFRPE
