Анализ состава береговых наносов на участке разгрузки вдольберегового песчаного потока, северная часть Черного моря
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2018
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Формирование осадочных толщ прибрежно-морского генезиса приурочено к очагам разгрузки вдоль-береговых потоков наносов, в том числе и песчаных. В составе этих толщ обнаруживаются фации прибойного потока, пляжей и береговых эоловых образований. В северной части Черного моря литологические различия между механическим составом этих фаций специально не исследовались. Для получения необходимой информации в июле 2016 г. было отобрано 240 проб наносов в 15 точках (длина берега 13 км) на участке разгрузки вдольберегового потока наносов. выполнен их фракционный анализ по динамической десятичной шкале. В каждой точке были рассчитаны средние значения фракций для фаций прибойного потока, пляжа и береговых дюн. Для каждой фации были установлены различия вдоль всей длины исследованного берега. Наиболее крупные наносы, но с минимальной концентрацией ведущей фракции 0,25-0,5 мм (33,07%) была обнаружена вдоль пересыпи лимана Сасык (I на рис. 1). Фракционные составы 1978 г. и 2016 гг. сравнивалось и показало общее уменьшение крупности в 7 фракциях из 10, всего на 55%.
In coastal environment sedimentary deposit thickness located in hotbeds of downthrow of alongshore sand drift flows within coastal zones of a Seas. In structure of the deposits were founded surf, beach and aeolian litho-logical facies, which are distinguishing. Before, differences between the facies not researched special within the Northern part of the Black Sea. For receiving of the necessary facies information 240 sediment samples were picked out along 15 profiles (region with 13 km long) for local lithological characteristics, for fraction analysis of samples first of all. Analysis processing was work out by decimal scale method for coastal facies with 10 fractions from > 10 mm to < 0,05 mm. For every shore profile, average values of every fraction were calculated for every littoral facies (with surf action, beach forming and aeolian condition). Fraction composition of sediment within every of facies were ascertained along crossing profiles and along shores in equal degree in region of research of sand coastal zone. Most complicated fraction composition is within surf action conditions, where all 10 fractions shown. Within aeolian conditions shown 5 fractions in all, it being known that two fractions are leading: 0,5-0,25 mm (48,42%) and 0,25-0,1 mm (21,48%). All of samples within aeolian coastal dunes contain this two fraction are leading in quantity from 58% to 89%. Fraction compositions 1978 and 2016 were compared an did show rising for concentration of fine fractions — from 0,5 mm to 0,1 mm on 55%.
In coastal environment sedimentary deposit thickness located in hotbeds of downthrow of alongshore sand drift flows within coastal zones of a Seas. In structure of the deposits were founded surf, beach and aeolian litho-logical facies, which are distinguishing. Before, differences between the facies not researched special within the Northern part of the Black Sea. For receiving of the necessary facies information 240 sediment samples were picked out along 15 profiles (region with 13 km long) for local lithological characteristics, for fraction analysis of samples first of all. Analysis processing was work out by decimal scale method for coastal facies with 10 fractions from > 10 mm to < 0,05 mm. For every shore profile, average values of every fraction were calculated for every littoral facies (with surf action, beach forming and aeolian condition). Fraction composition of sediment within every of facies were ascertained along crossing profiles and along shores in equal degree in region of research of sand coastal zone. Most complicated fraction composition is within surf action conditions, where all 10 fractions shown. Within aeolian conditions shown 5 fractions in all, it being known that two fractions are leading: 0,5-0,25 mm (48,42%) and 0,25-0,1 mm (21,48%). All of samples within aeolian coastal dunes contain this two fraction are leading in quantity from 58% to 89%. Fraction compositions 1978 and 2016 were compared an did show rising for concentration of fine fractions — from 0,5 mm to 0,1 mm on 55%.
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Ключові слова
Черное море, береговая зона, пески, распределение, фации, пляж, береговые дюны, состав наносов, Black Sea, coastal zone, sand, distribution, facies, beach, surf zone, shore dunes, sediment composition
Бібліографічний опис
Slovak international scientific journal . – Bratislava, 2017.