No abstract

This research applied the groundwater quality index (GWQI) and principal component analysis (PCA) for assessing pollution levels and factors effecting groundwater quality of Pleistocene aquifer in Tan Thanh district, Ba Ria – Vung Tau province. Seventeen wells were colected in April (dry season) and October (rainy season) during 5 years (2012-2017). Nine parameters of water (pH, TDS, độ cứng, Cl-, F-, NO3-, SO42-, Cu2+ và Fe2+) were collected for analyses. The results of GWQI (dry season) divided into 17 wells in dry season with groundwater quality from good to very good which occupied to 82% databases, compared to 94% of rainy season. Meanwhile, the number of wells significantly changed from poor to very poor water between two seasons. PCA demonstrated that two specific factors, interaction of chemical components in river sediments and character of aquifer and anthropogenic, affected to the quality of groundwater in this study area. These explained 65.555% (dry season) and 61.562% (rainy season) of the variances. This result is provided specific information, and the useful tools in order to deal with the complicated databases, as well as zone the groundwater quality in the study area. This further help the authorities to plan suitable strategy for groundwater quality management.

In this study, a hybrid model was developed by the combination of Group Multi‐Criteria Decision‐Making Based on Best‐Worst Method (so‐called Group Best Worst Method) and GIS‐Based Fuzzy Logic Relations to provide decision support of the sustainable development of wind power. The proposed model was developed in four main steps including 1) defining exclusion criteria and weighted criteria; 2) normalizing data by fuzzy membership functions in GIS environment; 3) determining the influence/weighting of the criteria through Group Best‐Worst Method; and 4) identifying the suitable areas for wind farm location. In a case study of Bac Lieu Province, Vietnam, it resulted in the coastal areas being most suitable for the development of wind power. It was found to be in line with the local plan of renewable energy development. Moreover, the paddy field areas could also be highly suitable for wind energy sitting due to the reduced adverse effects on nature reserves biodiversity, and the potential benefits associated with the increased land values and local farmer's income, higher crop yield, etc. The proposed hybrid model is considered a novel and straightforward approach in wind power planning that can be extended to other fields of MCDM regarding the selection of geographical location for the other renewable energy projects.

The inter-regional incidents associated with the oil spill is increasingly a serious problem to the industrial developing countries, like Vietnam. In this study, a multi-criteria analysis process was proposed to identify petroleum depots that represent potential inter-regional oil spill incidents in Ho Chi Minh City and the neighboring provinces. The criteria for determining the inter-regional inccidents asscociated with oil spill comprise of a number of criteria sets such as oil spill hazard criteria, inter-regional hazard criteria, oil spill damage criteria. Hierarchical analysis (AHP) has been applied for identifying the importance factor of the criteria. The total risk of inter-regional oil spill incidents are then estimated to provide effective support to the risk management and response plan.