Evapotranspiration and crop coefficient for Typha latifolia in constructed wetlands

IF 2 Q3 Environmental Science

Water Quality Research Journal of Canada Pub Date : 2018-05-01 DOI:10.2166/WQRJ.2018.041

J. G. T. Queluz, F. F. S. Pereira, R. M. Sánchez-Román

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引用次数: 7

Abstract

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 an 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.

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人工湿地中宽叶香蒲的蒸发蒸腾量和作物系数

本工作的目的是估算人工湿地中宽叶香蒲的作物蒸散量（ETc）和作物系数（Kc）。实验采用宽叶T.latifolia栽培的两个水平潜流人工湿地（HFCW）。每个HFCW每天接收50升二次出水，导致3.2天的标称水力停留时间（不考虑蒸发和降水的影响）。为了测定ETc，进行了HFCW的水质量平衡。在该分析中，ETc被认为等于流入（二次出水+沉淀）和流出之间的差。使用ETc和参考蒸散量（ETo）数据（Kc=ETc/ETo）计算Kc。结果显示，7天平均ETc在4.9–20.0 mm day−1的范围内变化显著，月平均为9.85 mm day−1。Kc的月平均值在2.03至3.68之间（平均值：2.74）。ETc对HFCW水平衡非常重要，因为它大大减少了出水量。因此，这项工作的结果表明，在设计人工湿地时，应考虑蒸散引起的水分损失。

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来源期刊

Water Quality Research Journal of Canada WATER RESOURCES-

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Water Quality Research Journal publishes peer-reviewed, scholarly articles on the following general subject areas: Impact of current and emerging contaminants on aquatic ecosystems Aquatic ecology (ecohydrology and ecohydraulics, invasive species, biodiversity, and aquatic species at risk) Conservation and protection of aquatic environments Responsible resource development and water quality (mining, forestry, hydropower, oil and gas) Drinking water, wastewater and stormwater treatment technologies and strategies Impacts and solutions of diffuse pollution (urban and agricultural run-off) on water quality Industrial water quality Used water: Reuse and resource recovery Groundwater quality (management, remediation, fracking, legacy contaminants) Assessment of surface and subsurface water quality Regulations, economics, strategies and policies related to water quality Social science issues in relation to water quality Water quality in remote areas Water quality in cold climates The Water Quality Research Journal is a quarterly publication. It is a forum for original research dealing with the aquatic environment, and should report new and significant findings that advance the understanding of the field. Critical review articles are especially encouraged.