Difference between revisions of "Template:This weeks featured article"

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==Portal on Marine Ecotoxicology==
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==Coastal Hydrodynamics And Transport Processes==
  
 
[[Image:300px-Paracelsus.jpg|thumb|left|180px|Paracelsus (1493 - 1541)]]
 
[[Image:300px-Paracelsus.jpg|thumb|left|180px|Paracelsus (1493 - 1541)]]
  
The founder of toxicology, Paracelsus (1493 - 1541) is most famous for his quote “'''All things are poison and nothing is without poison, only the dose permits something not to be poisonous'''”. With this, he indicated that in sufficiently large doses all substances can be toxic. At present there are about 100,000 chemicals known which might cause harm to humans or the environment. Ecotoxicology is the study of the harmful effects that chemical substances can have on living organisms and the environment. Information on the occurrence of chemicals and their effects on the environment provides an indication of the [[pollution]] level and associated [[Environmental risk assessment of marine activities|risks]]. Living organisms can accumulate certain chemicals in their bodies, which is called [[bioaccumulation]].  
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The hydrodynamic conditions or processes, that come about from waves transforming over a coastal profile and generating wave set up and longshore currents, will result in movement and transport of the sediments (e.g. sand) present in the profile. This is referred to as littoral transport processes and is the main subject of this article. However, transport of fine sediments will also be discussed, but only very briefly.
  
This portal shows and clarify research related to marine ecotoxicology. Through [[Portal:Ecotox/News|case studies]] at different trophic levels you will get acquainted with different groups of toxic substances and their effects on marine and estuarine organisms. This portal also lists the substances from [[OSPAR_List_of_priority_substances|OSPAR]] and the [[WFD_list_of_priority_substances|Waterframework directive]].
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==Sediment transport in general==
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The sediment on the seabed is transported when it is exposed to large enough forces, or shear stresses, by the water movements. These movements can be caused by the current or by the wave orbital velocities or a combination of both, the latter being the most important situation. The relevant parameters for the description of the sediment transport along a shoreline or in a coastal area are therefore the following...[More|Coastal Hydrodynamics And Transport Processes]]

Revision as of 16:09, 11 March 2010

Coastal Hydrodynamics And Transport Processes

Paracelsus (1493 - 1541)

The hydrodynamic conditions or processes, that come about from waves transforming over a coastal profile and generating wave set up and longshore currents, will result in movement and transport of the sediments (e.g. sand) present in the profile. This is referred to as littoral transport processes and is the main subject of this article. However, transport of fine sediments will also be discussed, but only very briefly.

Sediment transport in general

The sediment on the seabed is transported when it is exposed to large enough forces, or shear stresses, by the water movements. These movements can be caused by the current or by the wave orbital velocities or a combination of both, the latter being the most important situation. The relevant parameters for the description of the sediment transport along a shoreline or in a coastal area are therefore the following...[More|Coastal Hydrodynamics And Transport Processes]]