Environment and Ecology Research Vol. 5(6), pp. 427 - 435
DOI: 10.13189/eer.2017.050603
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Influence of Growth of Reeds on Evapotranspiration in Horizontal Subsurface Flow Constructed Wetlands

Tokuo Yano ^1,*, Masatomo Nakayama ², Kazuhiro Yamada ¹, Akiko Inoue-Kohama ¹, Shinya Sato ³, Keijiro Enari ^1
1 Department of Environment and Energy, Tohoku Institute of Technology, Japan
² Department of Civil Engineering and Management, Tohoku Institute of Technology, Japan
³ Sendai Kankyo Kaihatsu Co., Ltd, Japan

ABSTRACT

In this study, the influence of growth of reeds on evapotranspiration (ET) was estimated, and a commonly used meteorological estimate of potential evapotranspiration (PET) was compared with direct measurements of ET. The salinity of the inside of HSF of the raw leachate inflow was 15.0±3.4g Cl^-/L and that of the double diluted inflow was 9.3±1.9g Cl^-/L. Although the growth of reeds in the raw leachate inflow was impeded remarkably compared to that of the double diluted leachate inflow, the reeds in the double diluted inflow bed showed healthy growth. The difference in the salinity gave rise to large differences in the growth of the reed. The annual ET rates in the poor vegetation bed, the dense vegetation bed and the unplanted bed were 656.5mm, 2,334.3mm and 22.2mm, respectively. The difference of the growth of the reed provided a large difference in the ET rate. The annual PET estimated on the basis of the Hamon equation was 751.6mm. The PET rate was much lower compared to the ET rate in the dense vegetation bed. It was necessary to consider site-specific factors such as the growth of plants in the evaluation of the water budget in the HSFs.

KEYWORDS
Evapotranspiration, Growth of Reeds, HSF, Potential Evapotranspiration, Water Budget

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Tokuo Yano , Masatomo Nakayama , Kazuhiro Yamada , Akiko Inoue-Kohama , Shinya Sato , Keijiro Enari , "Influence of Growth of Reeds on Evapotranspiration in Horizontal Subsurface Flow Constructed Wetlands," Environment and Ecology Research, Vol. 5, No. 6, pp. 427 - 435, 2017. DOI: 10.13189/eer.2017.050603.

(b). APA Format:
Tokuo Yano , Masatomo Nakayama , Kazuhiro Yamada , Akiko Inoue-Kohama , Shinya Sato , Keijiro Enari (2017). Influence of Growth of Reeds on Evapotranspiration in Horizontal Subsurface Flow Constructed Wetlands. Environment and Ecology Research, 5(6), 427 - 435. DOI: 10.13189/eer.2017.050603.