Driving variables for eutrophication in lakes of Hanoi by data‐driven technique

To investigate eutrophication in 31 freshwater lakes in Hanoi, Vietnam, water quality and Chlorophyll‐a content were monitored to calculate trophic indices. Twelve of the 15 urban lakes investigated were eutrophic, of which five were hypertrophic, while only seven of the 16 suburban lakes were eutro...

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Bibliographic Details
Published in:Water and environment journal : WEJ 2017-05, Vol.31 (2), p.176-183
Main Authors: Hoang, Thu‐Huong Thi, Van, Anh Dieu, Nguyen, Hien Thi Thu
Format: Article
Language:English
Subjects:
algae bloom
Chlorophyll
Chlorophyll a
classification trees
Embankments
Eutrophic lakes
Eutrophication
eutrophication assessment
Freshwater
Freshwater lakes
Inland water environment
Lakes
Mathematical analysis
Mineral nutrients
Nutrients
trophic index
Trophic status
Trophic structure
Vietnam
Water quality
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Summary:To investigate eutrophication in 31 freshwater lakes in Hanoi, Vietnam, water quality and Chlorophyll‐a content were monitored to calculate trophic indices. Twelve of the 15 urban lakes investigated were eutrophic, of which five were hypertrophic, while only seven of the 16 suburban lakes were eutrophic. The Trophic Index (TRIX) was the best predictive index to identify the eutrophication level of the lakes. Classification trees (CTs) were applied to study the trophic status of lakes and identify the driving variables. The results demonstrated that eutrophication in the lakes of Hanoi was driven by nutrients and organic enrichment, as well as by inappropriate management such as unplanned embankment and water uses. DIN, BOD, lake size and embankment were the key parameters controlling eutrophication in the lakes of Hanoi.
ISSN:1747-6585
1747-6593
DOI:10.1111/wej.12231