Development and protection of the coasts in the Tallinn area

Levald, H; Valdmann, Ain

doi:10.3176/geol.2005.2.04

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Local Sediment Transport1

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2007

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“…As ferry wakes are present during a relatively calm season and at times approach from directions not common for wind waves, they may induce sediment transport in a direction opposite to the natural littoral drift (Elken & Soomere 2004). Their role in beach processes, although potentially substantial under certain circumstances (Soomere & Kask 2003;Levald & Valdmann 2005;Valdmann et al 2006), has been poorly understood to date.…”

Section: Local Sediment Transportmentioning

confidence: 99%

Transport and distribution of bottom sediments at Pirita Beach

Soomere¹,

Kask²,

Kask³

et al. 2007

Estonian J. Earth Sci.

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The basic factors affecting sediment supply for and transport processes at Pirita Beach, a sandy section of the southeastern coast of Tallinn Bay, are analysed. Observations of bathymetry, sediment properties and sources, sediment transport processes and their changes arising from coastal engineering activities are reported. The mean grain size is about 0.12 mm, with the fine sand fraction (0.063-0.125 mm) accounting for about 77% of the sediments. Coarse sand dominates only along the waterline. The content of coarser sediments is greater in the northern part of the beach. A number of coastal engineering structures have blocked natural sediment supplies. The beach suffers from sediment deficit now and has lost about 400 m 3 of sand annually from the dry beach between 1997 and 2005.

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Section: Local Sediment Transportmentioning

confidence: 99%