Tidal pumping caused by residual horizontal circulation is an important but ill-understood mechanism producing longitudinal salt dispersion in well-mixed estuaries. There are two types of residual circulation that cause tidal pumping: (1) interaction of the tidal previous termflownext term with a pronounced flood-ebb previous termchannelnext term system; and (2) interaction of the tidal previous ... Read More
The present study investigated the use of computational fluid dynamics (CFD) in predicting the formation, development, and migration of free-forming meander bends. The three-dimensional CFD model computed water flow and sediment transport in alluvial channels and predicted vertical and horizontal bed changes. Different algorithms and parameters were tested to provide an insight into the applicati ... Read More
In the present work, a three-dimensional suspended sediment model (SED) is built. A three-dimensional hydrodynamic model (COHERENS) and a third-generation wave model (SWAN) are fully coupled through accounting for mutual influences between wave and current in them. SED is combined with the coupled model built up above. Damping function of suspended sediment on turbulencenext term is introduced in ... Read More
After a decade of shouting, â€œFollow the water!â€ in its exploration of Mars, NASA can finally say that one of its spacecraft has reached out, touched water ice and scooped it up. Now, scientists will be able to tackle the main question they hope to answer: Did the ice ever melt and turn Mars into a habitable place? In a photograph released Thursday evening of a trench that the Phoenix Mars lander ... Read More
This paper deals with a numerical modelling devoted to predict the flow characteristics in the components of an oscillating water column (OWC) system used for the previous termwave energynext term capture. In the present paper, the flow behaviour is modelled by using the FLUENT code. Two numerical flow models have been elaborated and tested independently in the geometries of an air chamber and a ... Read More
In January, the UK government and Welsh Assembly launched a two-year feasibility study into the possibility of harnessing tidal energy in the Severn estuary in order to generate electricity. It has the second largest tidal range in the world, which could be used to meet up to 5% of the UK's electricity needs. Two forms of technology are being assessed by the study: tidal barrages and tidal lagoon ... Read More
The Antarctic Circumpolar Current (ACC), a prominent ocean current that flows around Antarctica, is an important component of global ocean circulation and climate.The current consists of a number of fronts. Observations indicate that turbulent mixing is enhanced in these fronts, penetrating through much of the water column. Noting that understanding the ACC is important to understanding regional ... Read More
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