Open AccessA NEW APPROACH TO OBTAINING STRATIGRAPHICALLY UNDISTURBED COLUMNS OF BOTTOM SEDIMENTS IN SHALLOW WATER BODIES
Author(s) -
V. A. Chechko,
В. Т. Пака,
A. P. Podufalov
Publication year - 2019
Publication title -
okeanologičeskie issledovaniâ
Language(s) - English
Resource type - Journals
eISSN - 2587-9634
pISSN - 1564-2291
DOI - 10.29006/1564-2291.jor-2019.47(4).12
Subject(s) - geology , drilling , ice wedge , debris , sediment , geotechnical engineering , petrology , geomorphology , materials science , oceanography , permafrost , metallurgy
The new universal sampler for selection of cores of bottom sediments in shallow reservoirs from low-dimensional vessels or from ice is presented. The tube is immersed manually by means of a partitioned boom. The immersion into the sediment depending on its softness/ denseness is produced by pressing or by rotating. For that, the tube is equipped with detachable tips – either a smooth nose cone, or an auger bit, respectively. The tube has a plastic liner inside and an orange peel closing system similar to those used in gravity corers but installed in a different way, taking into account the safety of thin-wall details during drilling. To do this, the orange peel rotating along with the tube is placed fully opened in spacing between the tube and the liner, that excludes its contact with the sample during immersion into the liner. To lock the core, the liner at the beginning of the recovery moves upwards so that the orange peel can close. As a result, it is possible to select cores with undisturbed structure on different types of sediment, except for dense gravel. The efficiency of the new sampler was confirmed by its successful use from motor catamaran and ice in studies of bottom sediments of the Curonian and the Vistula Lagoon and of the 25 m deep lake in the spent amber quarry. The sampler can be used in marine sedimentology, limnology, and geoecology to determine the physico-mechanical, chemical and other characteristics of bottom sediments.