Schorre

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Inland areas of a sand chute including a dune at low tide. Camber Sands on the English Channel, East Sussex , England.
Inland areas of a scree at low tide. Garlieston Bay in the north of the Irish Sea , Dumfries and Galloway , Scotland.
Extensive surf platform at Southerndown near Bridgend in South Wales .

The Schorre is an area that slopes gently towards the sea or rises towards the land, formed by surf and waves, and partly dry at low tide in the shoreline of a sea.

etymology

The word is probably derived from the Low German words Schare , Schore or Schoore , which means something like 'coast', 'shore' or 'alluvial land'. The English and Swedish words for 'coast' ( shore or skåre ) are also clearly related.

Schorren types

Depending on the material from which the chute is built, a distinction is made between rock chutes , scree chutes and sand chutes . The rock chorre is the foot of a cliff that has been prepared by abrasion , also known as a surf platform . In contrast, scree and sand are created by the deposition of loose material washed together, i.e. by sedimentation .

While the rock chorus is bounded on land by the cliff, sand and rubble chorus usually merge into the beach on land , or rather the beach, as the onshore part ( high chorre ) that is almost constantly dry and also in the change of tides , becomes a sedimentary one Considered Schorre. At the landward end of the sand chorre beach, a belt of dunes usually stretches along flat coasts . Sand and scree scree as well as the corresponding beaches also occur on cliff coasts if the material from which the cliff is made has only a low level of resistance to erosion.

Subdivision of the chorus

Depending on the location in the coastal profile, a distinction is made between the land and the sea side:

  • the high choir , which is almost never under water cover ( supratidal ),
  • the tidal choir , which is only covered by water at high tide and is dry at low tide ( intertidal ),
  • the underwater chute , which is in fact always covered by water ( subtidal ).

These sections are also called sand and scree chutes

  • dry beach (English backshore ),
  • wet beach (English foreshore ) and
  • Vorstrand (English shoreface ).

The underwater chute extends to a depth of several dozen meters and merges into the open shelf on the seaward side . On surf platforms, the rock of the underwater chute is mostly covered by loose sediments, which near the coast still consist of relatively coarse rubble ( sea ​​heaps ), but become finer-grained as the distance from the coast and the water depth increases. In the case of scree, too, the grain size of the material decreases with increasing distance from the coast.

Examples of Schorren

Sand scour:

  • almost the entire German Baltic coast

Boulders:

  • some stretches of coastline of the English Channel in southern England (e.g. near Budleigh Salterton ), there alternating with smaller surf platforms

Felsschorren:

  • Heligoland
  • Northern Spain
  • Wales

Individual evidence

  1. ^ Dictionary of the East Frisian Language. Etymologically edited by J. ten Doornkaat Koolman. Third volume, Q-Z. Published by Hermann Brams, Norden 1884.

literature

  • Herbert Louis, Klaus Fischer: General Geomorphology. 2 volumes. 4th edition. De Gruyter, Berlin 1979, ISBN 3-11-007103-7 .
  • Hans W. Füchtbauer: Sediment Petrology. Part 2: sediments and sedimentary rocks. 4th edition. Schweitzerbart, 1988, ISBN 3-510-65138-3 .
  • Peter Latzke: Coastal forms of the North Sea. GRIN-Verlag, 2004, ISBN 3-638-94775-0 .