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Application of Dean's curve to investigation of a long-term evolution of the Southern Baltic multi-bar shore profile

100%

Cerkowniak G. R., Ostrowski R., Pruszak Z.

Oceanologia

2017

tom 59

nr 1

The paper presents the results of studies on the long-term evolution of the multi-bar cross-shore profiles. The analysis is focused on time-dependent variability of shoreline position, a modified parameter A of the conventional Dean's equation and a parameter F describing the amount of nearshore sediment resources in the multi-bar cross-shore profile. The study also deals with interrelationships between these quantities. The analysis is carried out using field data collected at Lubiatowo, Poland, on the dissipative shore, representative for the south Baltic. The considered coastal segment is found to be stable in the long-term scale. The results of analysis show that the parameter A can either increase or decrease together with the shoreline advance. It is concluded that the shoreline position change is a parameter unsatisfactorily representative for behaviour of the seashore. The use of the Dean's approximation for estimation of the sediment resources F on the multi-bar seashore profiles is found reasonable to eliminate the effects of peculiarities of such shores.

Studies on riverbed evolution on the Nida river at the Pinczow and Wislica gauging station

67%

Lapuszek M.

Infrastruktura i Ekologia Terenów Wiejskich

2011

nr 12

The long-term evolution of the river beds of Nida River in Pińczów and Wiślica gauging station as well as an analysis of the causes of significant cases of lowering of the bottom of stream beds are presented in the paper. The intensity of river bed evolution as a stochastic process is described with the use of a statistical model. The analysis of the intensity of the process of river bed erosion was conducted under the assumption that the observed long-term trend of the lowest annual water levels reflect the elevation of the river bottom in the same years. The recorded observations at the Pińczów and Wiślica gauging stations on the Nida River, covering over 70-year period of time, are analyzed. Observations of the variability in the studied bottom levels over the decades allow concluding that the great transformation of riverbeds occurred there. The observations and calculations show that in Pińczów multistream or meandering river bed changed into straight channel and the process of shallowing of the river bed appeared. At the Wiślica gauging station the process of riverbed erosion with the variable intensity was observed. The research shows that the causes of these changes observed in Pińczów and Wiślica are not natural, but rather of human activity.

Ograniczanie wyników

1 Infrastruktura i Ekologia Terenów Wiejskich

1 Oceanologia

1 Cerkowniak G. R.

1 Lapuszek M.

1 Ostrowski R.

1 Pruszak Z.

1 2017

1 2011

Wyniki wyszukiwania

Application of Dean's curve to investigation of a long-term evolution of the Southern Baltic multi-bar shore profile

Studies on riverbed evolution on the Nida river at the Pinczow and Wislica gauging station