| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 9039 |
| title | Transport of fine sediments in marine waterbodies adjacent to river mouth: preliminary results |
| authors | Cerkowniak G., Kowalewski M. |
| pages | 255 — 275 |
| DOI | 10.1515/heem-2018-0016 |
| full text link | https://www.sciendo.com/article/10.1515/heem-2018-0016 |
| keywords | SPM, flocculation, sediment transport model, turbulence |
| affiliations | - Institute of Hydro-Engineering, Polish Academy of Sciences, 7 Kościerska, 80-328 Gdańsk, Poland
- Institute of Oceanography, University of Gdańsk, al. Marszałka Piłsudskiego 46, 81-378 Gdynia, Poland
|
| abstracts | Transport of fine sediments depends mainly on the efficiency of flocculation. Flocculation, un-derstood as the result of simultaneous processes of aggregation of particles and floc break-up,is a common phenomenon in marine environments. It is typical of fine sediments. This studypresents a mathematical model of fine sediment transport. A model of flocculation is an im-portant part of this model. Its main assumption is that flocculation is governed by turbulence.The model was qualitatively tested in a simplified theoretical waterbody. Such factors as thewind direction, wind speed, river discharge and concentration of suspension in the river wereinvestigated. The results show that the proposed model describes reasonably well the lithody-namic processes characteristic of fine flocculating sediments. Thus it seems possible to applyit for description of fine sediment transport under real wave–current conditions that occur inmany marine waterbodies near river mouths. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 9036 |
| title | Simulation of sea ice thermodynamics by a smoothed particle hydrodynamics method |
| authors | Staroszczyk R. |
| pages | 301 — 313 |
| DOI | 10.1515/heem-2018-0017 |
| full text link | https://www.sciendo.com/article/10.1515/heem-2018-0017 |
| keywords | sea-ice thermodynamics, Lagrangian description, smoothed particle hydrody-namics, moving boundary problem |
| affiliations | - Institute of Hydro-Engineering, Polish Academy of Sciences, ul. Kościerska 7, 80-328 Gdańsk, Poland
|
| abstracts | The paper deals with the problem of sea-ice pack motion and deformation under the actionof wind and water drag forces. Differential equations describing the behaviour of ice, with itsvery distinct material responses in converging and diverging flows, express the mass and linearmomentum balances on a horizontal plane (the free surface of the ocean). The thermodynamiceffects (ice melting and lead water freezing) are accounted for by adding source terms to theequations describing the evolution of the ice thickness and area fraction (concentration). Thesethermodynamic source terms are described by means of a single function that idealizes typicalice growth-rates observed in winter in the Arctic. The equations governing the problem aresolved by a fully Lagrangian method of the smoothed particle hydrodynamics (SPH). Assum-ing that the ice behaviour can be approximated by a non-linearly viscous rheology, the proposedSPH model was used to simulate the flow of a sea-ice pack driven by wind drag stresses andvarying seasonal temperatures. The results of numerical simulations illustrate the evolution ofan ice pack, including distributions of ice thickness and ice area fraction in space and time forassumed temperature distributions. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 9040 |
| title | The influence of slope geometry on its stability: spatial and plane analysis |
| authors | Zabuski L. |
| pages | 243 — 254 |
| DOI | 10.1515/heem-2018-0015 |
| full text link | https://www.sciendo.com/article/10.1515/heem-2018-0015 |
| keywords | slope stability, landslide, spatial analysis, numerical calculations, deformationprocess |
| affiliations | - Institute of Hydro-Engineering, Polish Academy of Sciences, 7 Kościerska, 80-328 Gdańsk, Poland
|
| abstracts | The paper presents the results of numerical calculations of the stability and deformation pro-cess of several idealized slopes performed by the elasto-plastic finite difference method, usingthe commercial codes FLAC3D and FLAC2D. The results of 3D analysis of these slopes arecompared with those obtained by the 2D method. The behaviour of slopes of different shapesand inclinations was analyzed. The calculations were carried out for flat, concave and convexslopes inclined at 30◦, 45◦and 60◦, taking into account the influence of the lateral constraintsof the slope. Two variants of the medium were analysed, i.e. the mass with no friction and withno cohesion. A comparison of 3D calculation results with those obtained by the 2D limit equi-librium analysis indicates that the 3D approach produces almost always higher safety factorsthan does the 2D method. |
| attributes | [reviewed] [scientific] |
| language | en |