Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: beach sediments

Sortuj według:

Ogranicz wyniki do:

Hazardous radioactivity levels and heavy mineral concentrations in beach sediments of Lake Peipsi, northeastern Estonia

Järvelill J.-I., Koch R., Raukas A., Vaasma T.

Geologos

2018

Vol. 24, No. 1

1--12

The present study discusses results of heavy mineral analyses and radioactivity of beach sediments of Lake Peipsi. Such analyses are commonly done globally, but had not yet been conducted for the fourth largest lake in Europe. The average heavy mineral content in Lake Peipsi beach sediments along the northern and western coast is higher than usual for Estonian coastal and Quaternary sediments. Concomitantly, elevated radioactivity levels have been measured in several places, with the highest concentrations observed at Alajõe (1885.5 Bq/kg), which is over five times more than the recommended limit. The aim of the present study is to find sites with higher radioactivity levels, because the northern coast of Lake Peipsi is a well-known recreational area.

Wpływ zmiennego klimatu falowego na różnookresową zmienność nadwodnej części brzegu (plaży)

Chrząstowska N., Pruszak Z.

Inżynieria Morska i Geotechnika

2014

nr 1

19--30

Analiza wpływu falowania na morfologię plaży. Obliczenie energii falowania głębokowodnego i porównanie z efektami morfodynamicznymi zachodzącymi na brzegu. Opis czasowej zmienności objętości osadów plażowych.

Analysis of the wave impact on the beach morphology. Calculation of the deep-water wave energy and comparison with morphodynamic effects on the coast. Description of time variation of the beach sediments volume.

Depositional environment of sediments along the southern coast of Tamil Nadu, India

Angusamy N., Rajamanickam G.V.

Oceanologia

2006

No. 48 (1)

87-102

Grain size studies of sediments from beaches in the region from Mandapam to Kanyakumari, divided into 5 sectors, indicate that sediments are unimodal to polymodal in nature, coarse to fine grained, moderately to poorly sorted, and positively-negatively skewed in character. The inference to be drawn from these studies is that the variation in sedimentological parameters is governed by fluvial input, wave dynamics, and littoral transport of the sediments. Bivariant plots show that the Mandapam and Kanyakumari sectors can be classified as beach environments, whereas the Tuticorin and Valinokkam sectors come under the influence of riverine environments and the dune environment in the Manappad sector. The CM pattern of all five sectors shows a clustered distribution of sediments in the PQ and QR segments, indicating a graded mode of deposition. Visher diagrams depict a wave shadow environment for the Mandapam sector, whereas the Valinokkam, Tuticorin and Manappad sectors show double saltation populations characteristic of beaches, and the Kanyakumari sector is characterized by a more truncated population characteristic of a plunge zone, which is a high-energy environment.