11:628:221 Study Guide - Final Guide: Dune, Gilgit-Baltistan, Beach Nourishment
18 May 2016
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Lagoons: questions to consider in evaluating an estuary. Human- nature interaction: estuarine evolution: many marshes in the us were established in the past 3,000- Following the end of the ice age, marshes and estuaries have seen still- standing sea level, wave energy and sediment availability: marsh shorelines - where wave energies are low and sediments are fine-grained. Accretion is the net building of marsh soils via deposition of mineral material or organic matter: beaches: where wave energy is concentrated; where sand and pebbles are available. Position is influenced by ocean waves through this process: Sand and pebbles move more readily and form an active beach. Larger beaches form on downwind side of estuaries. Humans form artificial beaches in low energy areas through nourishment/landfill. Upper beaches are more dynamic because they move and sort sediment. Lower energy, low tide areas are more productive and stable habitats.
