Evapotranspiration and crop coefficient for Typha latifolia in constructed wetlands

Autor(es)

Thomaz Queluz, Joao Gabriel ^[1] ; Sousa Pereira, Francisca Franciana ^[2] ; Sanchez-Roman, Rodrigo Maximo ^[2]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Inst Nat Sci & Technol, Petrol & Metallogeny Dept, BR-13506900 Rio Claro, SP - Brazil

^[2] Sao Paulo State Univ UNESP, Sch Agr, Rural Engn Dept, Rua Jose Barbosa de Barros 1780, BR-18610307 Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: WATER QUALITY RESEARCH JOURNAL OF CANADA; v. 53, n. 2, p. 53-60, MAY 2018.
• Citações Web of Science: 0

Resumo

The purpose of this work was to estimate the crop evapotranspiration (ETc) and to determine the crop coefficient (Kc) of Typha latifolia in constructed wetlands. The experiment used two horizontal subsurface flow constructed wetlands (HFCWs) cultivated with T. latifolia. Each HFCW received 50 L of secondary effluent daily, resulting in 3.2 days of nominal hydraulic retention time (disregarding effects of evapotranspiration and precipitation). In order to determine the ETc, water mass balance of the HFCWs was performed. In this analysis, ETc was considered equal to the difference between the inflow (secondary effluent + precipitation) and the outflow. The Kc was calculated using ETc and reference evapotranspiration (ETo) data (Kc = ETc/ETo). The results showed that 7-day average ETc varied dramatically within the range of 4.9-20.0 mm day(-1), with a monthly average of 9.85 mm day(-1). The mean monthly values of Kc varied from 2.03 to 3.68 (mean: 2.74). ETc is very important with respect to the HFCW water balance because it decreases effluent outflow considerably. Therefore, the findings of this work indicate that water losses caused by evapotranspiration should be considered when designing constructed wetlands. (AU)

• Processo FAPESP: 14/05997-6 - Modelagem dinâmica de alagado construído para o tratamento de águas residuárias domésticas em comunidades isoladas
• Beneficiário: Rodrigo Maximo Sanchez Roman
• Linha de fomento: Auxílio à Pesquisa - Regular