ABORDAGEM WEPP EM EROSÃO DO SOLO PARA BACIAS HIDROGRÁFICAS DO SEMIÁRIDO BRASILEIRO

Victor Casimiro Piscoya; Waldemir Pereira de Souza; Jose Ramon Barros Cantalice; Moacyr Cunha Filho; Robson Carlos Pereira de Melo; Renisson Neponuceno Araújo Filho

doi:10.1590/1983-21252020v33n327rc

Authors

Victor Casimiro Piscoya Department of Rural Technology, Universidade Federal Rural de Pernambuco, Recife, PE, https://orcid.org/0000-0003-1875-9771
Waldemir Pereira de Souza Department of Rural Technology, Universidade Federal Rural de Pernambuco, Recife, PE, https://orcid.org/0000-0002-3817-8766
Jose Ramon Barros Cantalice Department of Agronomy, Universidade Federal Rural de Pernambuco, Recife, PE https://orcid.org/0000-0002-8209-341X
Moacyr Cunha Filho Department of Statistics and Informatics, Universidade Federal Rural de Pernambuco, Recife, PE https://orcid.org/0000-0002-3466-8143
Robson Carlos Pereira de Melo Department of Rural Technology, Universidade Federal Rural de Pernambuco, Recife, PE, https://orcid.org/0000-0003-4594-5748
Renisson Neponuceno Araújo Filho Department of Forestry Engineering, Universidade Federal do Tocantins, Gurupi, TO https://orcid.org/0000-0002-9747-1276

DOI:

https://doi.org/10.1590/1983-21252020v33n327rc

Keywords:

Hydraulic relations. Flow rates. Erodibility. Shear stress.

Abstract

Soil erosion is a major environmental problem in many parts of the world and represents a serious problem for sustainable agriculture and the environment, with direct and indirect impacts on soil quality and fertility. This study aimed to use the Water Erosion Prediction Project (WEPP) model to estimate rill erosion and determine soil physical and hydraulic properties, which are essential to investigate its performance. To this end, an experiment was carried out in the Exu Creek watershed, in Serra Talhada, semi-arid region of Pernambuco State (Brazil), under increasing flow rates: T1: 5.87 L min-1; T2: 12.10 L min-1; T3: 20.33 L min-1; and T4: 27.57 L min-1. Liquid and solid discharges were sampled for determination and characterization of hydraulic parameters in preformed rill flows. Reynolds numbers between 2,019 and 6,929 and Froude numbers below 1 found in this study attest to occurrence of erosive rills. Soil losses due to rill erosion increased as flow rates increased. Rill erodibility was 0.0011 kg N-1 s-1, and critical shear stress (τc) was 1.91 Pa, collapsing rill sidewalls and increasing local uplift, wet perimeter, and rill hydraulic radius.

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