| ATTRIBUTE | VALUE |
|---|---|
| type | C |
| database id | 3630 |
| title | |
| authors | |
| affiliations | |
| year | 1995 |
| series | Archives of Hydro-Engineering and Environmental Mechanics |
| issue | Vol. 42, No. 1-2 |
| publisher | Wydawnictwo IBW PAN |
| place | Gdańsk |
| attributes | [published] [reviewed] [scientific] [international reach] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 3633 |
| title | Modelling of bed shear stress under irregular waves |
| authors | Kaczmarek L. M., Ostrowski R. |
| pages | 29 — 51 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem42no12str029.pdf |
| affiliations | |
| abstracts | A model of the turbulent boundary layer under irregular (random) waves is presented. The approach incorporates a time-invariant, two-layer eddy viscosity model including the representative parameters: friction velocity and bottom boundary layer thickness. The problem is closed by the iterative scheme for finding the wave period representing the random wave field. The scheme allows to solve the task associated with the appropriate choice of the equivalent wave period and to include the coupling effects between the harmonic components, incorporated in the eddy viscosity. Good conformity between the theoretical shear stress evaluations and experimental data is obtained. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 6 |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 3631 |
| title | Nonlinear effects of waves and currents on moveable bed roughness and friction |
| authors | Kaczmarek L. M. |
| pages | 3 — 27 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem42no12str003.pdf |
| affiliations | |
| abstracts | A new theoretical approach based on the grain-grain interaction ideas is proposed for the evaluation of moveable bed roughness under regular and irregular waves, sinusoidal/asymmetric waves with/versus currents. This method uses Coulomb friction between particles (plastic stresses) with viscous-type stresses for particle collision stresses to represent seabed drag effects in a similar way to the flow of cohesionless material. By using an iterative procedure to balance the overall drag the bed roughness is related to the applied hydrodynamic stress and hence the external wave field. The theoretical bed level is defined by the matching point of the logarithmic distribution with the sub-bed flow profile. For the moment when maximum shear stress occurs the continuity of shear stress and velocity at the theoretical bed level is required.The ability of the proposed iterative procedure to evaluate the roughness parameter has been checked for sandy bed with various grain diameters and various regular and irregular wave conditions. The proposed approach explains the reduction of spectral wave friction factors. The various aspects of the nonlinearity in respect to moveable bed roughness including the asymmetry of waves and the interactions between asymmetric waves and currents are discussed. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 6 |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 5096 |
| title | Bearing capacity of shallow foundations on slopes |
| authors | Bohdan Zadroga, Jorma Hartikainen |
| pages | 53 — 67 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem42no12str053.pdf |
| affiliations | |
| abstracts | In the paper the results of model tests and an analysis of calculation methods of bearing capacity of shallow foundations rested on the edge of slope are presented. Model tests were carried out in plane strain state with rigid rectangular strip foundations placed on homogeneous dry subsoil made of different kinds of material such as: natural gravel, dry sand and analogue material (the pin-model). Qualitative and quantitative results of slope inclination influence on bearing capacity are analysed. Some formulae and values of the slope inclination factor are recommended. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 3816 |
| title | Approximate description of Stokes` type waves generated in fluid of constant depth |
| authors | Szmidt J. K., Androsiuk J. |
| pages | 69 — 83 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem42no12str069.pdf |
| affiliations | |
| abstracts | In the paper, the generation of non-linear waves with moderate amplitude in water of finite depth is investigated. The surface waves are described by means of the Stokes' approximation up to the second order of expansion. The solution discussed is based on the description model given by Wilde and Romanczyk (1989) in which, the random Stokes' type wave with two components has slow varying phase and amplitude in time. The problem considered is solved in two steps. In the first, the linear component of the wave is obtained as the output of the linear time invariant system induced by a sample function of the stochastic process describing the wavemaker velocity. Then, in the second step, a supplementary solution is created. The latter corresponds to the double frequency of the wavemaker and expresses the second component of the Stokes' wave. Comparison of the theoretical solution obtained with experimental data shows that the model proposed leads to results of practically acceptable accuracy. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 6 |