By The Sea Waiting For Me

by Nava Thompson

Title

By The Sea Waiting For Me

Artist

Nava Thompson

Medium

Photograph - Photograph

Description

A photo taken by Nava Jo Thompson of a yellow umbrella in the sand at Emerald Beach Florida. ........The four sections of most beaches........1. Swash zone: is alternately covered and exposed by wave run-up........2. Beach face: sloping section below berm that is exposed to the swash of the waves.......3. Wrack line: the highest reach of the daily tide where organic and inorganic debris is deposited by wave action........4. Berm: Nearly horizontal portion that stays dry except during extremely high tides and storms. May have sand dunes.Although the seashore is most commonly associated with the word beach, beaches are found by lakes and alongside large rivers.....small systems where rock material moves onshore, offshore, or alongshore by the forces of waves and currents; or......geological units of considerable size.......The former are described in detail below; the larger geological units are discussed elsewhere under bars..........There are several conspicuous parts to a beach that relate to the processes that form and shape it. The part mostly above water (depending upon tide), and more or less actively influenced by the waves at some point in the tide, is termed the beach berm. The berm is the deposit of material comprising the active shoreline. The berm has a crest (top) and a face � the latter being the slope leading down towards the water from the crest. At the very bottom of the face, there may be a trough, and further seaward one or more long shore bars: slightly raised, underwater embankments formed where the waves first start to break..........The sand deposit may extend well inland from the berm crest, where there may be evidence of one or more older crests (the storm beach) resulting from very large storm waves and beyond the influence of the normal waves. At some point the influence of the waves (even storm waves) on the material comprising the beach stops, and if the particles are small enough (sand size or smaller), winds shape the feature. Where wind is the force distributing the grains inland, the deposit behind the beach becomes a dune................These geomorphic features compose what is called the beach profile. The beach profile changes seasonally due to the change in wave energy experienced during summer and winter months. The beach profile is higher during the summer due to the gentle wave action during this season. The lower energy waves deposit sediment on the beach berm and dune, adding to the beach profile. Conversely, the beach profile is lower in the winter due to the increased wave energy associated with storms. Higher energy waves erode sediment from the beach berm and dune, and deposit it off shore, forming longshore bars. The removal of sediment from the beach berm and dune decreases the beach profile.

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July 9th, 2012

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