Effects of Multi-Dike Protection Systems on Surface Water Quality in the Vietnamese Mekong Delta
| Autor: | Ram Avtar, Md. Mostafizur Rahman, Dat Q. Tran, Tran Van Ty, Kieu Ngoc Le, Huynh Vuong Thu Minh, Masaaki Kurasaki, Mitsuru Osaki |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Dike
lcsh:Hydraulic engineering Vietnamese Geography Planning and Development Aquatic Science Biochemistry spatiotemporal variation of water quality lcsh:Water supply for domestic and industrial purposes multi-dike-protection systems lcsh:TC1-978 rice intensification Turbidity Water Science and Technology Hydrology geography lcsh:TD201-500 geography.geographical_feature_category Flood myth Flooding (psychology) Protection system language.human_language multivariate analysis language Environmental science Water quality Surface water |
| Zdroj: | Water, Vol 11, Iss 5, p 1010 (2019) Water Volume 11 Issue 5 |
| ISSN: | 2073-4441 |
| Popis: | 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&minus PO43&minus 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&minus were detected in most of the primary canals along which residential, tourist areas and local markets were settled. However, NO3&minus 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|