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Effects of Multi-Dike Protection Systems on Surface Water Quality in the Vietnamese Mekong Delta

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Title: Effects of Multi-Dike Protection Systems on Surface Water Quality in the Vietnamese Mekong Delta
Authors: Huynh Vuong Thu Minh Browse this author
Kurasaki, Masaaki Browse this author →KAKEN DB
Tran Van Ty Browse this author
Dat Quoc Tran Browse this author
Kieu Ngoc Le Browse this author
Avtar, Ram Browse this author →KAKEN DB
Rahman, Md. Mostafizur Browse this author
Osaki, Mitsuru Browse this author
Keywords: multi-dike-protection systems
rice intensification
multivariate analysis
spatiotemporal variation of water quality
Issue Date: May-2019
Publisher: MDPI
Journal Title: Water
Volume: 11
Issue: 5
Start Page: 1010
Publisher DOI: 10.3390/w11051010
Abstract: The Vietnamese Mekong Delta (VMD) is one of the largest rice-growing areas in Vietnam, and exports a huge amount of rice products to destinations around the world. Multi-dike protection systems have been built to prevent flooding, and have supported agricultural intensification since the early 1990s. Semi-dike and full-dike systems have been used to grow double and triple rice, respectively. Only a small number of studies have been conducted to evaluate the water quality in the VMD. This study aimed to analyze the spatiotemporal variation of water quality inside the dike-protected area. Surface water samples were collected in the dry and wet seasons at 35 locations. We used multivariate statistical analyses to examine various water quality parameters. The mean concentrations of COD, NH4+, NO3-, PO43-, EC, and turbidity were significantly higher in water samples inside the full-dike system than in water samples from outside the full-dike systems and inside the semi-dike systems in both seasons. High concentrations of PO43- were detected in most of the primary canals along which residential, tourist areas and local markets were settled. However, NO3- was mainly found to be higher in secondary canals, where chemical fertilizers were used for rice intensification inside the dike system. Water control infrastructures are useful for preventing flood hazards. However, this has an adverse effect on maintaining water quality in the study area.
Type: article
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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