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Caracterização da formação de cheias na bacia do rio Una em Pernambuco: simulação hidrológica-hidrodinâmica

2015; Brazilian Association of Water Resources; Volume: 20; Issue: 2 Linguagem: Inglês

10.21168/rbrh.v20n2.p394-403

2318-0331

Alfredo Ribeiro Neto, José Almir Cirilo, CARLOS DANTAS, EDILSON SILVA,

Fish biology, ecology, and behavior

In June 2010, a hydrological event caused severe damage to cities located along the banks of the main rivers in Zona da Mata in the States of Pernambuco and Alagoas.The Una River basin was one of the most affected by the flood.The Una River basin covers 6,704.0km2 and is situated in the Zona da Mata and Agreste of Pernambuco State.To represent the event of June 2010, the rainfall-runoff model HEC-HMS and the hydrodynamic model HE-C-RAS were used.The geometry of the minor and major riverbed of the Una River and its tributary Pirangi River was determined by mean of surveying using the LiDAR technique (Light Detection and Ranging), which employs laser beams emitted from an aircraft to scan the river area and its proximities.The objective of the paper is to simulate the flood events that occurred in the Una river basin, verifying the main aspects that influence the formation of the flood in the river and how this influences the calibration of the models.Continuous and event-based manual calibration was tested.The results showed that it is not possible to get a single set of parameters for wet and dry periods.The best option was to calibrate the models using two flood events and validate them with six other events.After the calibration, the 2010 event was simulated to estimate the peak flow.The 2010 flood can be considered the most severe event that has ever occurred despite the lack of streamflow records.The result could be compared only to the spatialized water depth at Palmares city.There was an overestimation of the water depth calculated by the HEC-RAS model, but there was also a good agreement with the extent of the flooded area.