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Human factors and tidal influences on water quality of an urban river in Can Tho, a major city of the Mekong Delta, Vietnam |
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| Authors: | Hirokazu Ozaki Thi Kinh Co Anh Kha Le Viet Nu Pham Van Be Nguyen Mitsunori Tarao Huu Chiem Nguyen Viet Dung Le Hieu Trung Nguyen Masaki Sagehashi Sachi Ninomiya-Lim Takashi Gomi Masaaki Hosomi Hideshige Takada |
| Institution: | 1. Education Program for Field-Oriented Leaders in Environmental Sectors in Asia and Africa (FOLENS), Tokyo University of Agriculture and Technology, Tokyo, Japan 6. 3-5-8, Saiwaicho, Fuchu, Tokyo, 183-8509, Japan 2. Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Tokyo, Japan 3. Can Tho University, Can Tho, Vietnam 4. Institute of Agriculture, Tokyo University of Agriculture and Technology, Tokyo, Japan 7. Department of Environmental Health, National Institute of Public Health, Ministry of Health, Labour and Welfare, Tokyo, Japan 5. Institute of Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan |
| Abstract: | In this study, we focused on water quality in an urban canal and the Mekong River in the city of Can Tho, a central municipality of the Mekong Delta region, southern Vietnam. Water temperature, pH, electrical conductivity, BOD5, CODCr, Na+, Cl?, NH4 +?N, SO4 2??S, NO3 ??N, and NO2 ??N for both canal and river, and tide level of the urban canal, were monitored once per month from May 2010 to April 2012. The urban canal is subject to severe anthropogenic contamination, owing to poor sewage treatment. In general, water quality in the canal exhibited strong tidal variation, poorer at lower tides and better at higher tides. Some anomalies were observed, with degraded water quality under some high-tide conditions. These were associated with flow from the upstream residential area. Therefore, it was concluded that water quality in the urban canal changed with a balance between dilution effects and extent of contaminant supply, both driven by tidal fluctuations in the Mekong River. |
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