UM DESIGN ADAPTÁVEL DE BÁSCULAS PARA O MONITORAMENTO CONTÍNUO DO ESCOAMENTO SUPERFICIAL SOB DIFERENTES COBERTURAS DO SOLO

Código

ENES20200005

Autores

Dimaghi Schwamback, Jamil Alexandre Ayach Anache, Edson Cezar Wendland

Tema

09 - MEDIÇÕES DO MOVIMENTO DE SEDIMENTOS: METODOLOGIAS E TÉCNICAS

Resumo

Runoff measurement and monitoring is a laborious, time demanding, and financial consuming task. In this context, automatic equipment rises as a potential option to simplify in situ water resources monitoring. Here, we present an innovative design of tipping buckets flow meters of different sizes for the runoff monitoring in experimental plots (hillslope artificially delimited) under four common and contrasting land uses in the Southeast Brazilian region: Tropical woodland ? Woodland Cerrado (TB1), sugarcane (TB2), pasture (TB3), and bare soil (TB4). The equipment was designed using the rational method and has the following nominal capacities: 11.63mL (TB1), 64.16mL (TB2), 139.86mL (TB3), and 660.95mL (TB4). Each tipping bucket was tested in laboratory under low and high flow rates (return period over 100 years). Linear regression showed great correlation (R²>0.99) and statistical significance (KGE > 0.85) between reference and measured flow rates. After the implementation of the calibration curve, the fitting curve was ideal in TB1 (PBIAS = 0), while underestimation still occurred in TB2 (0.079%), TB3 (1.189%), and TB4 (1.397%). Even though the tipping buckets were not dimensioned to operate under high flow rate, the equipment had satisfactory performance (error less than 1.4% after calibration) under those extreme conditions. Finally, the methodology employed in this paper can be easily reproduced for both calibration and construction of a low-cost equipment that facilitates runoff measurement at different land covers.