spur dike is an important element for protection of river banks. spur dike causes variations in flow field, sediment transport and bed topography. the mechanism of flow and sediment transport in a channel bend is very complex, especially when a spur dike is constructed in a bend. in this paper the time variations of dimension of the scour hole and the bed’s topography were considered around a t...

Sulfateand Fe(III)-reducing, and methanogenic prokaryotes (SRP, FRP, MGP) are key players in metabolic pathways involved in anaerobic biodegradation processes. Understanding the metabolic activity of these microbes in environments can enhance microbe-mediated processes such as oil spill bioremediation and methane biogas production. In this study, anaerobic microbial activities in Deepwater Hori...

Sedimentation of fine-grained sediments in estuaries is a natural physical phenomenon influenced by biogeochemical processes. In the estuarine turbidity maximum (ETM), enhanced net deposition observed even areas with higher hydrodynamic exposure, such as navigational channel. Maintenance dredging common method to maintain channel, which requires large financial effort and has potential negative...

The discovery in 2004 by Mars exploration rover Opportunity of sedimentary rocks with centimeter-scale trough cross-bedding is one of the compelling lines of evidence for flowing water on the Martian surface. The rocks contain a significant evaporite component mixed with weathered mafic silicates, suggesting that the aqueous fluid in contact with the sediments must have been of very high ionic ...

Most wetted surfaces that are illuminated support a population of phototrophs. The marine sediment is no exception and there the major component of the microphytobenthic population is diatoms. These organisms are credited with stabilizing the sediment against physical disturbance by virtue of the extracellular carbohydrate polymers that they elaborate. However, diatoms synthesize and secrete se...

Tropical cyclones affect the Gulf of Mexico coastline annually; however, the historical record of these events is limited to about 400 years. To establish the occurrence frequency and the importance of cyclones in creating strata, this record needs to be validated by examining coastal sediments for preservation potential of storm bedding. St. Vincent Island National Wildlife Refuge is located i...

Sediment-maintenance flushing flows designed to mimic the action of natural floods in removing the accumulated fine sediments from the channel and loosening the gravel bed have been increasingly proposed as an effective alternative in dam management and a required component of riverine restoration programmes. However, reservoir releases are generally associated with financial and environmental ...

Deepwater lobes constitute a significant volume of submarine fans and are primarily believed to exhibit simple sheet geometry. However, recent studies interpret the geometries these deep-marine as distinct with respect complexity facies their distribution. Hence, conceptual model sediments is essential discuss associated fan lobe architecture. The present study highlights heterogeneity distribu...