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Previous studies have shown a strong linear correlation between the common hydraulic indicators of free water surface constructed wetlands (FWS CWs), which results in the waste of computing resources and confusion in evaluating the hydraulic performance of FWS CWs. There is an urgent need to define a relatively independent and authoritative hydraulic indicator. In this study, based on three years' data, the correlations among five representative hydraulic indicators, that is, short-circuit index (φ 10 ), Morrill dispersion index (MDI), effective volume ratio (e), moment index (MI), and hydraulic efficiency (λ e ), were analyzed by combining a variety of methods. The results of the correlation analysis and principal component analysis clearly showed the positive correlations among φ 10 , e, MI, and λ e (p < 0.01), and the strong negative correlations between MDI and the remaining four indexes, which were further confirmed by redundancy analysis (RDA). Most importantly, the significant correlations between MI vs e and φ 10 vs e were proved through rigorous mathematical reasoning for the first time. Besides, the results of RDA indicated that the studied design parameters, namely, water depth, hydraulic loading rate, plant spacing, aspect ratio, layout of inlet and outlet, and plant species, could generally explain the variation in hydraulic indicators. The layout of inlet and outlet displayed positive effects on hydraulic performance, and the water depth exhibited negative effects. Combining the clarity of physical meaning, convenience of calculation, and universality of reflecting both hydraulic and treatment performances, e was recommended as the most authoritative hydraulic indicator to evaluate hydraulic performance. The clustering results based on e were highly consistent with those based on the comprehensive principal component score. Wetlands with a combination of lower water depth and better layout of inlet and outlet usually have better hydraulic performance. This study successfully revealed the significant correlations among hydraulic indicators and their sources, and recommended a unique hydraulic indicator to authoritatively evaluate the hydraulic performance of FWS CWs.

Titel:	Clarifying the correlations between hydraulic indicators evaluating the hydraulic performance of free water surface constructed wetlands.
Autor/in / Beteiligte Person:	Wan, D ; Li, Y ; Zhu, Q ; Cui, Y ; Shu, Y ; Guo, C
Link:	View record at Springer (Volltext)
Zeitschrift:	Environmental science and pollution research international, Jg. 31 (2024-02-01), Heft 7, S. 10673-10688
Veröffentlichung:	<2013->: Berlin : Springer ; <i>Original Publication</i>: Landsberg, Germany : Ecomed, 2024
Medientyp:	academicJournal
ISSN:	1614-7499 (electronic)
DOI:	10.1007/s11356-023-31229-6
Schlagwort:	Waste Disposal, Fluid methods Water Plants Wetlands Water Purification methods
Sonstiges:	Nachgewiesen in: MEDLINE Sprachen: English Publication Type: Journal Article Language: English [Environ Sci Pollut Res Int] 2024 Feb; Vol. 31 (7), pp. 10673-10688. <i>Date of Electronic Publication: </i>2024 Jan 11. MeSH Terms: Wetlands* ; Water Purification* / methods ; Waste Disposal, Fluid / methods ; Water ; Plants References: Adhikari U, Harrigan T, Reinhold DM (2015) Use of duckweed-based constructed wetlands for nutrient recovery and pollutant reduction from dairy wastewater. Ecol Eng 78:6–14. https://doi.org/10.1016/j.ecoleng.2014.05.024. (PMID: 10.1016/j.ecoleng.2014.05.024) ; Bai Y, Zhang S, Mu E et al (2023) Characterizing the spatiotemporal distribution of dissolved organic matter (DOM) in the Yongding River Basin: insights from flow regulation. J Environ Manage 325:116476. https://doi.org/10.1016/j.jenvman.2022.116476. 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(PMID: 10.1016/j.ecoleng.2011.08.011) Grant Information: U2040213 National Natural Science Foundation of China; 42201091 National Natural Science Foundation of China; CKWV2021891/KY Changjiang River Scientific Research Institute; 2022M713233 Postdoctoral Research Foundation of China; 2022ZB451 Jiangsu Funding Program for Excellent Postdoctoral Talent (CN) Contributed Indexing: Keywords: Design parameter; Dimensionality reduction; Evaluation index; Hydraulic performance; Mathematical reasoning; Optimal index selection; Significant correlation Substance Nomenclature: 059QF0KO0R (Water) Entry Date(s): Date Created: 20240110 Date Completed: 20240208 Latest Revision: 20240208 Update Code: 20240208

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Clarifying the correlations between hydraulic indicators evaluating the hydraulic performance of free water surface constructed wetlands.