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PL
Wnioski wynikające z przeanalizowania pomiarów prądów rejestrowanych w sąsiedztwie głowic falochronów Przekopu Mierzei, rekonstrukcji numerycznej falowania na przedpolu portu i pomiarów poziomów morza.
EN
Conclusions resulting from the analysis of measurements of currents recorded in the vicinity of pierheads of the Vistula Split, numerical reconstruction of waves and measurements of sea levels.
PL
Efekty przejścia reprezentatywnego przepływu płuczącego w poszczególnych modelowych wariantach zabudowy ujścia Wisły. Prace pogłębiarskie i sztuczna wyspa. Długoterminowe efekty działania fal i prądów. Ocena optymalnego rozwiązania w perspektywie 10 lat.
EN
Effects of the representative flushing discharge for individual model variants of the Vistula mouth regulation. Dredging works and the artificial island. Longterm impact of waves and currents. Assessment of the optimal solution in the perspective of 10 years.
EN
Rip currents, which are local seaward-directed jets with their mean velocity exceeding 0.5 m/s, have been a subject of many studies since the 1940s. They are an important part of the nearshore current system and in specific hydro- and litomorphological conditions can cause changes in the local bathymetry. Thus, a detailed analysis of the characteristics of this phenomenon is crucial both to public safety and hydroengineering. The main purpose of this research is to determine the wave conditions of a multi-bar non-tidal coastal zone environment in which rip currents can occur. In this study, we focus on a multi-bar non-tidal coastal zone environment located in the Southern Baltic Sea, where rip current driving forces are mostly reduced to the wind and wind-induced waves. This is one of very few comprehensive approaches to exploring the possibility of rip currents occurrence in such environmental conditions. During two field expeditions, there were carried out in situ measurements exploiting two GPS drifters. The results indicate the formation of irregular non-longshore flows (related to rip currents) in the studied area. To answer the question under what conditions the formation of rip currents takes place, an extended modelling experiment was performed. Deep-water wave conditions typical of the studied area were chosen due to bouy measurements. The total of 589 combinations of the significant wave height, the mean period and wave direction values were examined as test cases. The coastal flow in the area and tracks of virtual drifters were simulated by XBeach numerical model for all test cases. As a result, 589 nearshore currents fields were generated and two scenarios were indicated: a regular circulation (dominated by the longshore current) which is typical of this area (547 cases), and flows with rip current features (42 cases). This reflects the results of the field measurements carried out. It can be concluded that the wave direction is a dominating factor in the formation of rip currents. Namely the flows of this type may occur in the area of interest when the direction of a deep water wave is almost perpendicular to the shore. Such situations occur rarely. They cover about 7% of the days of the year. Thus, rip currents do not appear to be a significant factor in the reconstruction of the sea bottom in the studied area.
PL
Wykonane inwestycje hydrotechniczne (wybudowane progi podwodne, ostrogi brzegowe, przeprowadzone sztuczne zasilanie oraz posadowione nowatorskie obiekty hydrotechniczne – tzw. moduły) w strefie brzegowej, na odcinku 232,00 ÷ 232,85 KM (okolice Ustki). Analiza przyczyn częściowego zniszczenia modułów po dwóch latach od wybudowania.
EN
Coastal engineering structures (submerged breakwaters, groins, beach nuorishment and innovative facilities – so-called modules) carried out in the Polish coastal zone, on the section 232.00 ÷ 232.85 KM (in the vicinity of Ustka harbour). Analysis of the causes of partial destruction of the modules after two years of construction.
PL
Analiza procesów hydro-, lito- i morfodynamicznych zachodzących w ujściowym odcinku Wisły i w przylegającej do ujścia morskiej strefie brzegowej. Wyznaczenie charakterystycznych parametrów przepływu rzecznego oraz klimatu wiatrowo-falowego w sąsiedztwie ujścia. Analiza zmienności poziomu wody w morzu, przygotowanie modelu numerycznego i sformułowanie ogólnych scenariuszy (wariantów) modelowania.
EN
Analysis of hydro-, litho- and morphodynamic processes occurring at the Vistula mouth and in the coastal zone adjacent to the mouth. Determination of characteristic parameters of the river discharge and the wind-wave climate in the mouth vicinity. Analysis of sea water level variability, preparation of the numerical model and formulation of general modelling scenarios (variants).
PL
Weryfikacja modelu falowania SWAN. Opis ekspedycji pomiarowej Lubiatowo 2006 wraz z omówieniem analizy danych falowych. Kierunkowo-częstotliwościowe widmo falowe dla południowego Bałtyku – przybliżenie widmem JONSWAP. Kierunkowa analiza spektralna falowania. Ocena przydatności modelu SWAN.
EN
Verification of the wave model SWAN. Description of the field experiment Lubiatowo 2006, including the wave data analysis. Directional-frequency wave spectrum for the south Baltic – approximation by the JONSWAP spectrum. Directional spectral analysis of waves. Assessment of usefulness of the SWAN model.
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