Effects of Land Use Changes on Streamflow and Sediment Yield in Atibaia River Basin—SP, Brazil

The Soil and Water Assessment Tool (SWAT) is often used to evaluate the impacts of different land use scenarios on streamflow and sediment yield, but there is a need for some clear recommendations on how to select the parameter set that defines a given land use scenario and on what is the most appro...

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Bibliographic Details
Published in:Water (Basel) 2020-06, Vol.12 (6), p.1711
Main Authors: Mendonça dos Santos, Franciane, Proença de Oliveira, Rodrigo, Augusto Di Lollo, José
Format: Article
Language:English
Subjects:
Agricultural production
Aquifers
Atmospheric boundary layer
Calibration
Environmental management
Environmental quality
Fluvial sediments
Geographic information systems
Heat
Hydrologic models
Hydrology
Land use
Parameter estimation
Parameter sensitivity
River basins
Rivers
Runoff
Sediment yield
Sediments
Sensitivity analysis
Soil erosion
Stream discharge
Stream flow
Studies
Temperature
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Summary:The Soil and Water Assessment Tool (SWAT) is often used to evaluate the impacts of different land use scenarios on streamflow and sediment yield, but there is a need for some clear recommendations on how to select the parameter set that defines a given land use scenario and on what is the most appropriate methodology to change the selected parameters when describing possible future conditions. This paper reviews the SWAT formulation to identify the parameters that depend on the land use, performs a sensitivity analysis to determine the ones with larger impacts on the model results and discusses ways to consider future land use conditions. The case study is the Atibaia river basin, with 2838 km2 (São Paulo, Brazil). The parameters identified by sensitivity analysis with the largest impacts on streamflow and sediment yield were the initial curve number for moisture condition II (CN), maximum canopy storage for each land use (CANMX) and the cover and management factor (USLE_C). The identification and appropriate parameter change can provide real estimates of the magnitudes in the land use changes, which were verified in this study. Such information can be used as an instrument for proposing improvements in the basin’s environmental quality and management.
ISSN:2073-4441
2073-4441
DOI:10.3390/w12061711