Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: coastal evolution

Sortuj według:

Ogranicz wyniki do:

Development of the sandy coast : Hydrodynamic and morphodynamic conditions (on the example of the Eastern Gulf of Finland)

Divinsky Boris V., Ryabchuk Darya V., Kosyan Ruben D., Sergeev A. Yu.

Oceanologia

2021

No. 63 (2)

214--226

Forecasting the coastal zone development under possible climatic changes and technogenic impact is an extremely important task. This forecasting is based on our understanding of the mechanism of the hydrodynamic processes impact on the coastal zone. The goal of this work is to describe the hydrodynamic conditions (currents, sea level, surface waves) of coastal waters and to assess the influence of hydrodynamic parameters on the general dynamics of the beach. The object of this study is a part of the southern coastal zone of the Gulf of Finland (Baltic Sea). The method of research is a full-scale experiment and mathematical modeling. The initial data for the analysis are climatic characteristics of the hydrodynamic regime of the sea (velocity and direction of currents, sea level, integral parameters of wind seas and swell), as well as interannual variations in the position of the coastline in the region of the Izhora village in the eastern part of the Gulf of Finland. Interannual variations in hydrodynamic parameters and volumes of bottom material transported under the influence of wind seas and swell were estimated. Main conclusion: swell waves determine the general background in the patterns of the bottom material transport, and the contribution of wind seas is in the formation of beach properties, namely, the accumulation or decrease of beach material.

Evolution of the semi-enclosed basins and surrounding coastal plains adjacent to the Pampean Region, Argentina

Violante R. A., Cavallotto J. L.

Polish Geological Institute Special Papers

2004

Vol. 11

59-70

The coastal plains adjacent to the Pampean region in eastern Argentina evolved during the Holocene in response to interaction between sea level fluctuations and different littoral dynamic factors in such a way that several sedimentary environments developed. Evolutionary stages can be synthesised in three periods: 1) the post-LGM transgression, when landward migrating coastal barriers extended on the present shelf under the effect of a dominant northward littoral drift; 2) the last stages of the transgression (between 8000 and 6000 years BP), when the rising sea flooded the Alto Marítimo (a pre-Holocene positive morphological feature which in previous times separated the course of the de la Plata river from the open sea), resulting in a new coastal configuration in which the presence of two headlands, Punta Piedras (in the north) and Villa Gesell (in the south), influenced the coastal processes so changing the original regional northward littoral drift into cell-type circulation systems; 3) between 6000 years BP and the present, when progradation processes characterised by barriers and beach ridges development dominated as a result of the sea level fall and an excess of sediment supply. As a result, coastal semi-enclosed basins located in between the headlands, such as Samborombón bay and Mar Chiquita lagoon, became the main depocenters where low-energy conditions (coastal lagoons, tidal flats and marshes) prevailed due to its isolation from the open-sea by the barriers and ridges. Interaction between southward migration of coastal environments associated to the northern headland and northward migration of those related to the southern headland was a very important process in shaping the present morphology of the area.