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N. Cao Don
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TRAJECTORY MODELING OF MARINE OIL SPILLS: CASE STUDY OF LACH HUYEN PORT, VIETNAM D. Quang Tri; N. Cao Don; C. Yi Ching
Lowland Technology International Vol 15 No 2, Dec (2013)
Publisher : International Association of Lowland Technology

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Abstract

In 2011, an oil spill occurred off Lach Huyen port in the Northeast of Vietnam, due to vessels collision. the result of collision caused pollution on wide area and surrounding areas. This paper was used MIKE 21 SA model to simulate oil spill transport with five scenarios. The results of simulation showed that spill trajectory and slick arrea depend on analysis hydraulic regime, wind direction and wave in the study area. This paper presents the model application for simulating spill scenarios. It helps in selecting eco-sensitive regions for preparedness and planning suitable response strategies whenever spill incident occurred.
PREDICTION MODEL OF INUNDATION IN PUMPED-FIELD LOWLANDS AND SCENARIOS FOR IMPROVING ITS PERFOMANCE N. Cao Don; H. Araki; H. Yamanishi; K. Koga
Lowland Technology International Vol 5 No 1, June (2003)
Publisher : International Association of Lowland Technology

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During rainy season, frequent flooding by strom water is one of the most serious problems in lowland areas, causing heavy effect on transportation, agriculture, industry, and economic activities. As a result, the required drainage water levels in this area are generally lower than the water levels of boundary rivers. Under such circumstances, pumping system should be designed from a viewpoint of integrated control floods. The Nam Ha lowland, in Vietnam, bounded by four surrounding rivers, is selected as a case study. The operation scheme in this area is a key factor for drainage and flood protection. This developed mathematical model can be used as a tool to evaluate the present drainage system as well as flooding processes in the field as well as inundation areas and water levels along drainage channels. It is found that the proposed model can be applied to evaluate integrated flood control system for pumped-field lowland. Such an operating system provides an effective tool by means of which the drainage system can be operated appropriately taking into account of tidal effects, rainfall intensity, and reaching time of the rainwater.
HYDRAULICS OF GROUNDWATER FLOW AND MECHANICAL PROPERTIES AFFECTING AQUIFER SYSTEM COMPRESSION IN SHIROISHI, SAGA PLAIN N. Cao Don; H. Araki; H. Yamanishi; K. Koga
Lowland Technology International Vol 5 No 2, Dec (2003)
Publisher : International Association of Lowland Technology

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Land subsidence in Shiroishi area in the Saga plain, Japan, has become noticeable since 1960s. Water supplied to agriculture has traditionally been a high priority for water managers in this region. Intense withdrawals of groundwater in excess of natural recharge have resulted in land subsidence in this region. Land subsidence can have several negative economic and social implications. Many problems associated with land subsidence can be observed in this area. In this paper, a numerical model that incorporated 3-D groundwater flow and I-D ground consolidation was applied to simulate groundwater level and ground consolidation. It is found that subsidence rapidly occurs throughout the area with the central prone in Shiroishi basin. Certain hydrogeologic parameters such as inelastic storage coefficient, elastic storage coefficient, and hydraulic conductivity of soil layers contribute significantly effects to both the rate and magnitude of consolidation. Moreover, a considerable reduction in discharge is supposed necessary for future development of the region to alleviate the effects of groundwater overdraft.
ESTIMATING THE POTENTIAL FOR CONJUNCTIVE WATER MANAGEMENT IN COASTAL PLAINS N. Cao Don; H. Araki; N. T. Minh Hang; H. Yamanishi; K. Koga
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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This paper presents the development and application of a conjunctive water management model for lowland catchments. The model incorporates a simulation model and a management model to simulate groundwater movement, ground consolidation and to search for the potential pumping amount of groundwater without violating physical and environmental constraints. The results reveal that groundwater levels in a coastal aquifer greatly vary in response to pumping. Consequently subsidence rapidly occurs throughout the area. The study also suggests that conjunctive water management can be used to improve water supply reliability, to reduce groundwater overdraft and land subsidence and to improve environmental conditions.
HYDROGEOCHEMICAL DESCRIPTION OF GROUNDWATER IN A COASTAL LOWLAND PLAIN NEAR THE ARIAKE SEA OF JAPAN N. Cao Don; Mohan S. Kumar; H. Araki; H. Yamanishi
Lowland Technology International Vol 10 No 1, June (2008)
Publisher : International Association of Lowland Technology

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In the management of water resources, quality of water is just as important as its quantity. In this paper, an investigation was undertaken to better understand the hydrogeochemistry and hydrologic framework of the Shiroishi plain in Saga, Kyushu, Japan. A network of production boreholes and wells distributed over the studied region were sampled and the waters were analyzed for major ions. The results reveal that, in areas near the shore, salinization is more serious at deeper layers. Geochemical analyses showed that the Shiroishi aquifer has bicarbonate sodium water, with an increase of electrical conductivity, sodium and bicarbonates contents.
ENVIRONMENTAL IMPACTS CAUSED BY PADDY FIELD MANAGEMENT V. V. N. Murty; N. Cao Don; H. Araki
Lowland Technology International Vol 11 No 1, June (2009)
Publisher : International Association of Lowland Technology

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Paddy fields occupy large areas and are an important component of the cropped areas in the Asian Region. In this study, the environmental impacts caused by paddy field management are investigated and studied. It is observed that paddy fields cause both beneficial and adverse effects on the environment. The beneficial effects consist of flood retardation, sediment retention and recharge to groundwater. Important adverse effects are contamination to water resources, effect on human health and methane emissions. Steps needed to mitigate the adverse effects from paddy fields are also considered. These include understanding the water balance components for efficient water management, provision of surface and subsurface drainage systems and recirculation of drainage water. Water quality aspects, which need to be considered while recirculation drainage water and final disposal of the drainage water, are also studied. While all aspects of water quality are important, in general water quality aspects, which need attention, appear to be the total nitrogen and pesticide residues. Further studies are needed to manage both these constituents of the drainage water.
Co-Authors C. Yi Ching D. Quang Tri H. Araki H. Yamanishi K. Koga Mohan S. Kumar N. T. Minh Hang V. V. N. Murty