Numerical simulation of water flooding into a damaged vessel’s compartment by the volume of fluid method

When a vessel is damaged, seawater floods into the damaged compartments and subsequently influences the motion of the vessel. Furthermore, the vessel’s behaviour affects the floodwater motion. In this paper, a Navier-Stokes (NS) solver with a free surface capturing technique, i.e., the volume of fluid (VOF) method, was developed to numerically simulate water flooding into a damaged vessel. To verify the developed solver, a 2-D and a 3-D dam break problems were tested. The numerical results coincide well with the experimental results and with the published numerical results. Additionally, it was used to solve the problems of linear and non-linear liquid sloshing in a hexahedral tank. The numerical results are satisfactory in comparison with the experimental results and analytical solutions. Finally, the phenomenon of water flooding into a damaged compartment of a Ro-Ro ferry was simulated numerically. The computed results are in good agreement with the experimental data.     

2005年10月02日福州洪水对流体观测干扰分析

本文记叙了2005年10月02日福州洪水对流体的干扰及其分析。     

Spatio-temporal assessment of perfluorinated compounds in the Brisbane River system,Australia: Impact of a major flood event

Perfluorinated chemicals including PFOA and PFOS have been widely used in consumer products and have become ubiquitous pollutants widely distributed in the aqueous environment. Following a major flood event in 2011, water samples were collected along a spatial gradient of the Brisbane River system to provide an initial estimate of the release of PFASs from flooded urban areas. PFOA (mean concentrations 0.13–6.1 ng L⁻¹) and PFOS (mean concentrations 0.18–15 ng L⁻¹) were the most frequently detected and abundant PFASs. Mean total PFASs concentrations increased from 0.83 ng L⁻¹ at the upstream Wivenhoe Dam to 40 ng L⁻¹ at Oxley Creek, representing an urban catchment. Total masses of PFOA and PFOS delivered into Moreton Bay from January to March were estimated to be 5.6 kg and 12 kg respectively. From this study, urban floodwaters appear to be a previously overlooked source of PFASs into the surrounding environment.     

Abkhandari （Aquifer Management）： a Green Path to the Sustainable Development of Marginal Drylands

1 Introduction A desert is defined as a large area of barren land, waterless and treeless, often sand-covered (Oxford Advanced Learner’s Dictionary of Current English 1974). The presence of numerous, sometimes prosperous agricultural communities in the so-called deserts defies this definition. The land is not necessarily barren; leaching of nutrients that causes certain deficiencies in the soils of humid environments hardly occurs in deserts. The most apparent deficiencies for crop product…     

长江中下游地区地震活动与洪涝灾害关系探讨

大量例证说明,地震在一定程度上与洪涝 (强降水)存在着某种联系。流体对岩石的渗透作用, 地球的热动力学作用,大气低压对岩石孔隙气体和液体的吸取作用,基于地质构造的触发作用等,可能是地震与洪涝(强降水)相互存在一定关联的原因。长江中下游地区水系丰富,湖泊众多,是我国洪涝多发区,该区还存在着中强地震的活动,开展地震活动与洪涝灾害关系的研究,预测地震活动与洪涝灾害同步达到高峰的时间、相互作用强度等有利于长江中下游地区综合减灾工作。