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Open AccessArticle

Simplified Method for the Assessment of Siltation in Semiarid Reservoirs Using Satellite Imagery

Campus Professora Cinobelina Elvas, Federal University of Piauí, Bom Jesus 64900-000, Brazil
Department of Agricultural Engineering, Federal University of Ceará, Fortaleza 60450-760, Brazil
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Water 2019, 11(5), 998;
Received: 24 March 2019 / Revised: 28 April 2019 / Accepted: 1 May 2019 / Published: 13 May 2019
(This article belongs to the Section Hydrology)
The Brazilian semiarid region strongly depends on superficial reservoirs (one every 5 km 2 ) and hence is subject to the deleterious effects of siltation, which reduces water availability. This research proposed a method, simplified bathymetric surveying using remote sensing, for updating the morphological parameters of reservoirs. The study area was the Pentecoste reservoir (360 hm 3 ) in northeastern Brazil. The results were compared to the conventional bathymetric survey method, which demands more sampling points (235 compared to 1) and was assumed as reference. Siltation assessed through the proposed method was nearly twice as high as that observed through conventional surveys. The morphological parameters derived by both methods were used to assess the long-term water balance of the reservoir. The results show that the outflow diverged 30%, while the evaporated discharge and water availability diverged 10% between the methods. Therefore, in the conditions of the Brazilian semiarid region, the simplified method suffices to assess the water availability of reservoirs affected by silting. View Full-Text
Keywords: bathymetry; GIS; water yield discharge; elasticity bathymetry; GIS; water yield discharge; elasticity
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Lopes, J.W.B.; de Araújo, J.C. Simplified Method for the Assessment of Siltation in Semiarid Reservoirs Using Satellite Imagery. Water 2019, 11, 998.

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