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Lookup NU author(s): Dr James Bathurst
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In the Cariri region in the semiarid Northeast of Brazil, precipitation varies considerably in space and time, and land use changes as a consequence of deforestation. The effects of these factors on basin responses are qualitatively known, but an assessment of the magnitude of the effects is still needed. In this paper, the physically based and spatially distributed model SHETRAN was parameterized in order to simulate the processes of runoff and sediment yield in various catchments with changes in the annual rainfall totals varying from 400 mm (dry), through 600 mm (normal) to 800 mm (wet), and percentage of basin area deforested from 10 to 90%. The results showed that, overall, peak discharges and volumes at basin areas from 100 m2 to 137 km2, and sediment yields for areas up to 11 km2, increased by 1.5 to 12-fold as annual rainfall changed from dry to wet and deforestation from 10 to 90%, while annual sediment yields for the largest area (137 km2) increased by 38 times as annual rainfall increased from dry to normal, then to wet.
Author(s): De Figueiredo E, Bathurst JC
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: IAHS-AISH Publication
Year of Conference: 2006
Pages: 620-626
