| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 6185 |
| title | Application of neural networks to the prediction of significant wave height at selected locations on the Baltic Sea |
| authors | Paplińska-Swerpel B., Paszke Ł. |
| pages | 183 — 201 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem53str183.pdf |
| keywords | sea wave forecast, neural networks, sea waves, Baltic Sea |
| affiliations | - Institute of Hydro-Engineering of the Polish Academy of Science, ul. Kościerska 7, 80-328 Gdańsk, Poland, e-mails: bep@ibwpan.gda.pl, L.Paszke@ibwpan.gda.pl
|
| abstracts | This paper describes the application of methodology based on the artificial neural network technique to make short-term wave forecasts. The neural network model is used to predict significant wave height at a selected location on the Baltic Sea based on wave and/or wind data at ten points scattered on the sea. High quality hindcast data were used in the process of developing the forecast methodology. The data originated from the WAM4 wave model. The results show that the neural network technique allowed significant wave height to be predicted accurately. The agreement obtained by a comparison with a testing data set was sufficiently good to confirm the effectiveness of this approach. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 6 |
| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 6186 |
| title | The influence of changes of soil parameters due to consolidation on the interaction of piles and soft soil layer |
| authors | Kurałowicz Z. |
| pages | 203 — 233 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem53str203.pdf |
| keywords | piles, soil parameters, soft soil layer |
| affiliations | - Gdańsk University of Technology, Faculty for Civil and Environmental Engineering, ul. Narutowicza 11/12, 80-952 Gdańsk, Poland, e-mail: zkur@pg.gda.pl
|
| abstracts | The problem of determination of lateral earth pressure of the soft soil on piles related to the safe design of construction founded on deep piles is presented in the paper. The examples of lateral earth pressure acting against piles are described, as well as properties and response of non-cohesive, cohesive and organic soils forming a soft layer subjected to unsymmetrical loading. Current approaches related to the determination of lateral earth pressure loading the piles are shown. The influence of consolidation on the change of soil strength parameters is presented as well as the application of own model and laboratory test results to the Winter-Leinekugel proposal of earth pressure calculation. Many years research have been carried out in cooperation with Prof. Helmut Meissner from Kaiserslautern University, Germany under the common project entitled "The lateral earth pressure of soft soil acting against piles" as well as in the frame of grants of Polish Research Council. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 6188 |
| title | Hydraulic transients analysis in pipe networks by the Method of Characteristics (MOC) |
| authors | Wichowski R. |
| pages | 267 — 291 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem53str267.pdf |
| keywords | hydraulic transients, method of characteristics, single pipe, experimental measurements, pipe networks, numerical simulation |
| affiliations | - Gdańsk University of Technology, Faculty for Civil and Environmental Engineering, ul. Narutowicza 11/12, 80-952 Gdańsk, Poland, e-mail: rwich@pg.gda.pl
|
| abstracts | The paper presents results of an experimental and theoretical study of the hydraulic transients in straight pipes and numerical simulations of unsteady flow in pipe networks. A mathematical model consists of a set of partial differential equations of hyperbolic type, which have been transformed by the method of characteristics into ordinary differential equations which are solved by the predictor-corrector method. Experimental tests have been performed, in order to examine the hydraulic transients phenomenon, in a single straight steel pipe. The experiments were carried out in the hydraulic laboratory of the Institute of Water Supply and Water Engineering, Environmental Engineering Faculty, Warsaw University of Technology.
The numerical results show that the presented one dimensional model for a single pipe correctly describes the phenomenon since there is a good agreement with experimental maximum and minimum oscillations. In the paper, selected exemplary equations in a difference form for the pipe networks are also presented. One calculation example is given relating to the complex water-pipe network consisting of 17 loops, 48 pipelines and 33 nodes, supplied by two independent sources. Water-hammer throughout the whole pipeline network was caused by closing the gate valve at mid-point of one selected pipe. The results of the numerical calculations are presented in graphic form with respect to the final cross-sections of pipes. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 6187 |
| title | Application of two coastal profile evolution models to Lubiatowo, Poland and La Barrosa, Spain |
| authors | O'Hare T. J., Ostrowski R., Emsley S. M., Huntley D. A. |
| pages | 235 — 266 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem53str235.pdf |
| keywords | beach, coastal profile model, hydrodynamics, sediment transport |
| affiliations | - Ocean and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, United Kingdom, e-mails: tohare@plymouth.ac.uk, dhuntley@plymouth.ac.uk
- Institute of Hydro-Engineering of the Polish Academy of Science ul. Kościerska 7, 80-328, Gdansk, Poland, e-mail: rafi@ibwpan.gda.pl
|
| abstracts | Two contrasting coastal profile models are applied to three bathymetries including a uniform gradient beach and natural profiles (multi-barred and multi-stepped) obtained from Lubiatowo, Poland and La Barrosa, Spain. The first model, developed at the Institute of Hydro-Engineering of the Polish Academy of Science (IBW PAN) (Poland), couples a quasi-3D model for nearshore hydrodynamics with a quasi-phase resolving sediment transport model which considers transport in the bed load, contact load and outer layers. The second model (PLYMPROF), developed at the University of Plymouth (UK), couples a relatively simple wave transformation model with a new abstracted description of cross-shore sediment transport beneath waves.
A variety of model simulations are described, including simple runs with uniform wave forcing (up to 50 days in duration using PLYMPROF) and runs with parameterized wave forcing (wave height and wave period in deep water) for periods with one or two storm events (6–11 days total duration). Both models coped well with the different initial profiles and with uniform and time-varying wave conditions. The results of the simulations suggest that onshore-directed sediment transport in the shoaling and outer surf zones is dominant for the cases considered. Compared to the IBW PAN model, the PLYMPROF model results (using coefficients from a separate study of bar evolution at Duck, USA) show larger offshore-directed transport in the inner surf zone associated with return flow, with the overall sediment transport pattern located considerably closer to the shore. Alteration of a single coefficient in the PLYMPROF model shifts the predicted transport pattern seawards, but also results in enhanced offshore-directed transport.
Despite differences in predicted cross-shore sediment transport the two models produced surprisingly similar trends in overall profile evolution suggesting that feedback between existing bathymetry and the sediment transport pattern may exert a major control on profile development. Results also suggested that bar migration patterns cannot be simply related to the occurrence or absence of storm conditions, but rather depend more subtly on the exact placement of wave breaking locations in relation to existing bars. Incorporation of tidal water level variations for La Barrosa produced small changes in model predictions, with tidal migration of the sediment flux pattern suppressing the development of bar morphology in line with the form of the observed profile. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 1.5 |