| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 8842 |
| title | Influence of nearshore mining pits on hydro- and lithodynamics of a dissipative coastal zone: case study of the Hel Peninsula (Poland) |
| authors | Ostrowski R., Skaja M. |
| pages | 237 — 252 |
| DOI | 10.1515/heem-2016-0015 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem63str237.pdf |
| keywords | cross-shore profile, waves, wave energy dissipation, grain size, bed shear stresses, nearshore mining pits |
| affiliations | - Institute of Hydro-Engineering, Polish Academy of Sciences, Kościerska 7, 80-328 Gdańsk, Poland, e-mails: rafal.o@ibwpan.gda.pl, mskaja@ibwpan.gda.pl
|
| abstracts | The paper deals with a sandy shore located on the open sea side of the Hel Peninsula in Poland
(the south Baltic Sea coast). The study site displays a cross-shore profile that intensively dissipates wave energy, mostly due to breaking. The theoretical modelling of wave transformation
at this site reveals specific distributions of wave heights and bed shear stresses. The sediment
borrow areas, presently used and identified for future exploitation, are located inconveniently
far from the periodically re-nourished shores. The paper presents the possibilities of dredging
works in the coastal zone that would not disturb the natural nearshore motion of water and
sediments. The results of the study can be helpful in formulating generic safety standards, at
least with respect to dissipative shores of non-tidal or micro-tidal seas, like the Baltic Sea. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 14 |
| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 8843 |
| title | On uncertainties in determination of sediment transport rates in coastal regions |
| authors | Ostrowski R. |
| pages | 265 — 280 |
| DOI | 10.1515/heem-2016-0017 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem63str265.pdf |
| keywords | waves, wave-driven currents, bed shear stresses, friction velocity, sediment transport |
| affiliations | - Institute of Hydro-Engineering, Polish Academy of Sciences, Kościerska 7, 80-328 Gdańsk, Poland, e-mail: rafal.o@ibwpan.gda.pl
|
| abstracts | The paper deals with research uncertainties, difficulties, inaccuracies and unreliabilities related to the modelling of physical phenomena involving coastal lithodynamics. The considerations are focused on processes of wave transformation, wave-driven currents and sediment
transport itself. It is shown that possible inaccuracies at individual stages of the modelling
of coastal hydrodynamics can lead to serious uncertainties with respect to the ultimate modelling output, namely bed shear stresses and sediment transport rates. These inaccuracies result mostly from arbitrarily assumed parameters and constants. Other modelling biases discussed in the paper comprise simplifications and approximations with respect to sediment resources and size-graded properties, randomness of hydrodynamic impacts, bottom roughness
and land-borne factors involved in coastal lithodynamics. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 14 |
| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 8850 |
| title | Structures of turbulent vortices in floodplains of compound channels |
| authors | Alfonsas Rimkus |
| pages | 281 — 295 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem63str281.pdf |
| keywords | hydraulic investigations, coherent structures, measurement analysis |
| affiliations | - Water Research Institute of Aleksandras Stulginskis University, LT-58102, Vilainiai, Kedainiai, Lithuania, e-mail: alfonsas.rimkus@hidro.lzuu.lt
|
| abstracts | In turbulent flows, several kinds of vortices and their structures are developed. After physical
summation al velocities created by them, they intertwine, and the picture obtained from their
measurement chronograms is mostly chaotic. Consequently, these structures become masked.
It is therefore very difficult to investigate them and despite many studies performed so far, they
have not been sufficiently explored. Favorable conditions for investigations of velocity measurement chronograms occurred when sufficient long intervals were observed, in which the
above mentioned masking is minimal. In such intervals, the investigation of turbulent vortices
and their structures becomes possible, and it has been performed to some degree. The results
of these investigations of the compound channel were already discussed in two previously
published articles. The first describes all vortices and their structures in the whole water flow
of the compound channel. The second contains a detailed analysis of vortices and their structures in the central vertical of the main channel. This article, discuss investigations of coherent
structures formed in the floodplain. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 8849 |
| title | Whirling system of water exchange in breeding pools |
| authors | Karolina Matej, Iwona Pawliczka, Jerzy M. Sawicki, Paweł Wielgat, Piotr Zima |
| pages | 253 — 263 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem63str253.pdf |
| keywords | sea mammal breeding, sealarium, water circulation, breeding pools |
| affiliations | - Gdańsk University of Technology, Faculty of Civil and Environmental Engineering, ul. G. Narutowicza 11/12, 80-233 Gdańsk, Poland, e-mails: karolina.matej@gmail.com, jsaw@pg.gda.pl, pawwielg@pg.gda.pl, pzim@pg.gda.pl
- University of Gdańsk, Institute of Oceanology, Marine Station, ul. Morska 2, 84-159 Hel, Poland, e-mails: iwona.pvp@ug.edu.pl
|
| abstracts | To create proper living conditions for sea mammals kept in closed systems, one has to make
sure that the characteristics of breeding pools, such as their shape, dimensions, the facing of the
walls and bottom, as well as the quality and motion of water, resemble as closely as possible
the natural environment of the animals. An appropriate system of water exchange plays a very
important role here. A complete exchange of water is time-consuming, expensive and troublesome, so it can be performed only periodically and should be supported by a supplementary
continuous exchange. This operation improves water quality and can create a proper velocity
field in breeding pools. The breeding pools investigated in the present study are located in
a sealarium in Hel (Poland), which belongs to the Institute of Oceanography of the Gdańsk
University. Tracer measurements, carried out in these reservoirs made it possible to evaluate
the intensity of continuous water exchange. It was found that this intensity was insufficient (as
evidenced by large dead zones in the pools and short detention time), and therefore alterations
to the existing system were proposed (i.e. a tangential position of the inlet and a centrally
situated outlet). On the basis of a simplified model of circulative water flow, it was shown that
the altered hydraulic system can considerably improve the situation. |
| attributes | [reviewed] [scientific] |
| language | en |