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      Representação dos processos hidrológicos em bacia hidrográfica do semiárido paraibano com modelagem hidrológica distribuída Translated title: Hydrological processes representation in a semiarid catchment located in Paraiba state with distributed hydrological modeling

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          Abstract

          RESUMO O modelo hidrológico distribuído de grandes bacias MGB–IPH vem sendo aplicado em diversas bacias hidrográficas brasileiras com resultados satisfatórios. Entretanto, a aplicabilidade desse modelo a bacias de rios intermitentes, como é típico da região semiárida brasileira, ainda é questionada e foram realizadas apenas limitadas avaliações. Esta pesquisa analisa o desempenho e a aplicabilidade do modelo MGB-IPH em representar os padrões espaço-temporais dos processos hidrológicos na bacia do Rio Piancó (PB), a montante do posto fluviométrico Piancó (área de drenagem de 4603 km2). O MGB-IPH foi executado para um período de 42 anos (1970 a 2011) a nível diário e com células regulares de 5 × 5 km. O modelo conseguiu reproduzir o comportamento geral do hidrograma observado diário e mensal, com métricas equivalentes às obtidas em estudos de bacias de rios perenes realizados com o mesmo modelo. Essas métricas também foram comparáveis ao desempenho de estudo anterior na mesma bacia, porém realizado apenas com passo de tempo mensal e outros modelos hidrológicos. Duas dificuldades principais foram a simulação dos maiores eventos de cheia e da intermitência do rio. Os processos hidrológicos intermediários à transformação chuva-vazão (evapotranspiração, armazenamento de água no solo e geração de escoamento) se mostraram coerentes em termos de sazonalidade, magnitude e distribuição espacial na bacia.

          Translated abstract

          ABSTRACT The large-scale distributed hydrological model MGB-IPH has been applied to several Brazilian watersheds with acceptable results. However, the applicability of this model to watersheds with intermittent rivers, typically occurring in the Brazilian semiarid region, is questioned and limited evaluation has been carried out. This research analyzes the performance and applicability of the MGB-IPH model in representing the spatio-temporal patterns of hydrological processes in the Piancó catchment (PB), upstream from the Piancó streamgauge station (drainage area of 4,603 km2). The MGB-IPH was run for a 42-year period (1970 to 2011) with a daily time step and regular grid cells (5 × 5 km. The model was able to satisfactorily reproduce daily and monthly observed hydrographs, obtaining skill scores equivalent to other model applications for perennial rivers, as well as comparable to the performance of an earlier study developed in this same catchment area (but carried out with a monthly time step and applying different hydrologic models). No systematic error of the model for over- or underestimating the discharges was observed. The hydrological processes intermediate to the rainfall-runoff transformation (evapotranspiration, soil water storage and runoff generation) were coherent in terms of seasonality, magnitude and spatial distribution over the catchment area.

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          Most cited references46

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          LISFLOOD: a GIS‐based distributed model for river basin scale water balance and flood simulation

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                rbrh
                RBRH
                RBRH
                Associação Brasileira de Recursos Hídricos
                2318-0331
                September 2016
                : 21
                : 3
                : 556-569
                Affiliations
                [1 ] Universidade Federal de Pernambuco Brazil
                [2 ] Universidade Federal da Paraíba Brazil
                Article
                S2318-03312016000300556
                10.1590/2318-0331.011616009
                0134365a-cea2-4e3f-abcd-998ce6ca012e

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=2318-0331&lng=en
                Categories
                ENGINEERING, ENVIRONMENTAL
                ENGINEERING, GEOLOGICAL
                ENGINEERING, MARINE
                ENGINEERING, OCEAN

                Environmental engineering
                MGB-IPH,Distributed hydrologic model,Rainfall-runoff modeling,Intermittent river,Semiarid region,Modelo hidrológico distribuído,Modelagem chuva-vazão,Rio intermitente,Região semiárida

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