Bao Loc is one of two cities of Lam Dong province. Located on Di Linh – Bao Loc plateau about 800 – 1000m elevation, Bao Lọc has the complex mountainous terrain. The authors have surveyed and collected information and samples in the landslide area. This area occurred the cracks, damaged several buildings within 1.2 ha. The authors have also identified causes of landslide such as geomorphotogy, stratigraphic slope, slope materials, hydrogeology, climate, etc. However, the main cause was soil extraction activities at toe of slope which lost the counterweight berm, associated with the moisture increase of soil due to heavy rainfall in rainy season. It reduced the shear strength of slope materials. Based on data analysis of surveyed location, the authors applied GeoStudio software by SLOPE/W module so as to calculate the slope stability under the sections. Analyzed results showed that the slope was stable in dry season with the minimum factor of safety (FS) around 1.474, in rainy season the slope was unstable with minimum the factor of safety around 0.896 commensurate with groundwater present model. The minimum factors of safety in the model with the appearance of groundwater table are represented by the distance among the slope sections following the relationship function with correlation coefficient (R2) is 0.9915. According to the interpolated result from the relationship function showed that the width of unstable area or the width of sliding mass is 35.1m. As the obtained results, the authors proposed realizable solutions to stabilize the slope in order to minimize the effect of landslide at the study area.
In recent years, beach and shoreline erosion has occurred increasingly around the world. Because of climate change and human activities, many beaches and shorelines have been eroded severely in Vietnam, especially in Vung Tau City. In order to understand and explain the reasons why Vung Tau beaches have been eroded, the author applied the Geographic Information System (GIS) and Remote Sensing (RS) to analyze the movement of beach in the past and present. The results showed that Vung Tau city has witnessed a massive shoreline replacement including severe erosion and gradual accretionsince 1989. CuaLap river mouth features all-time biggest changes with more than 800 meter of retreating shoreline.
Locating on the domestic and international navigation routes (Long Tau-Tac Dinh Cau route, Soai Rap route) the Can Gio area is impacted by waterway traffic activities. The seasonal movement of sand bars on the Can Gio is significantly impacted by hydrodynamic of the river mouth. With the important roles of the area, the authors consider the coastal morphology processes under the hydrodynamic. In this paper, the authors has inherited previous studies combined the satellite image analysis to detect the shoreline changes from 1973 to 2013. Besides, numerical modeling was also applied to predict the shoreline changes under impacts of the sea level rise. Results show that, the Can Gio shoreline prolonging from Can Thanh to Dong Hoa is seriously eroded, with average of 7-10 m/year, maximum to 15 m/year. It is found that, beach erosion at Can Gio is a kind of surface erosion impacted by human trigger (shrimp ponds, beach encroachment…). In addition, natural factors (wave, long-shore current, littoral materials) also contribute to increase the erosion rate. Predicted results with sea level rise scenarios show that, the Dong Hoa and Can Thanh will be seriously eroded while the 30-4 beach will be annually deposited.
Production of Oil & Gas in offshore involves some of the most ambitious engineering projects of the modern world, is a prime source of revenue for many countries. It is also involved risks of major accidents which have been demonstrated by disaster on the UK production platform Piper Alpha. Major accidents represent the ultimate, most disastrous way in which an offshore engineering project can go wrong. Accidents cause death, suffering, environmental pollution and disruption of business. To ensure all risks identified and controlled, risk management approaches need applying. This paper discusses the application of quantitative risk assessment approaches and its importance throughout the entire offshore installation.
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