Instytut Budownictwa Wodnego
Polskiej Akademii Nauk
Polskiej Akademii Nauk
| ATTRIBUTE | VALUE |
|---|---|
| type | C |
| database id | 8730 |
| title | |
| authors | |
| affiliations | |
| year | 2016 |
| series | Archives of Hydro-Engineering and Environmental Mechanics |
| issue | Vol. 63, No. 1 |
| place | Gdańsk |
| attributes | [published] [reviewed] [scientific] [international reach] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 8733 |
| title | Wave transformation in a multi-bar surf zone: case study of Lubiatowo (Poland) |
| authors | Lan Y.-J., Hsu T.-W., Ostrowski R., Szmytkiewicz M. |
| pages | 19 — 34 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem63str019.pdf |
| keywords | wave transformation, wave energy dissipation, wave breaking, multi-bar cross-shore profile, phase-averaged model, hydraulic jump model |
| affiliations |
|
| abstracts | The paper presents results of field and theoretical investigations of wave transformation in the surf zone near the IBW PAN Coastal Research Station in Lubiatowo (Poland, the south Baltic Sea). The study site displays multi-bar cross-shore profiles that intensively dissipate wave energy, mostly induced by breaking. The main field data comprise wave heights and cross-shore bathymetric profiles. Wave transformation is modelled theoretically by two approaches, namely the IBW PAN phase-averaged wave transformation model and the approach based on the hydraulic jump model, developed by Hsu & Lai (2009) for hydrological situations encountered under the actual conditions of two field campaigns – in 1987 and 1996. Discrepancies between the measured data and the model results are discussed. In general, the model results are in good agreement with the in-situ observations. The comparison of the field data with the computational results concerns a part of the surf zone between about 5 m water depth and the first nearshore stable bar, where the depth amounts to ca. 1.2 m. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 14 |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 8732 |
| title | Transformation of long waves in a canal of variable section |
| authors | Szmidt K., Hedzielski B. |
| pages | 3 — 18 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem63str003.pdf |
| keywords | long water wave, canal of variable section, enforcement of wave height, material variables |
| affiliations | |
| abstracts | The paper deals with long water waves propagating in a straight canal of constant depth and variable section. In the formulation of this problem, a simplified, one-dimensional model is considered that is based on the assumption of a “columnar” fluid motion. To this end, a system of material coordinates is employed as independent variables in the description of this phe- nomenon. The main attention is focused on transient solutions corresponding to a fluid motion starting from rest. With respect to the initial value problem considered, we confine our attention to a finite domain fluid motion induced by a piston-type generator placed at the beginning of the canal. For a finite elapse of time, measured from the starting point, the solution in the finite fluid area mimics a solution within an infinite domain, inherent for wave propagation problems. The main goal of our investigations is to describe the evolution of the free surface (the wave height) at the smallest section of the canal. Numerical examples are provided to illustrate the model formulation developed in this paper. The accuracy of this approximate description is assessed by comparing its results with data obtained in hydraulic experiments performed in a laboratory flume. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 14 |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 8756 |
| title | An analysis of the impact of valve closure time on the course of water hammer |
| authors | Apoloniusz Kodura |
| pages | 35 — 45 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem63str035.pdf |
| keywords | time of valve closure, butterfly valve, pressure characteristic, transient flow, water hammer |
| affiliations | |
| abstracts | The knowledge of transient flow in pressure pipelines is very important for the designing and describing of pressure networks. The water hammer is the most common example of transient flow in pressure pipelines. During this phenomenon, the transformation of kinetic energy into pressure energy causes significant changes in pressure, which can lead to serious problems in the management of pressure networks. The phenomenon is very complex, and a large number of different factors influence its course. In the case of a water hammer caused by valve closing, the characteristic of gate closure is one of the most important factors. However, this factor is rarely investigated. In this paper, the results of physical experiments with water hammer in steel and PE pipelines are described and analyzed. For each water hammer, characteristics of pressure change and valve closing were recorded. The measurements were compared with the results of calculations perfomed by common methods used by engineers – Michaud’s equation and Wood and Jones’s method. The comparison revealed very significant differences between the results of calculations and the results of experiments. In addition, it was shown that, the characteristic of butterfly valve closure has a significant influence on water hammer, which should be taken into account in analyzing this phenomenon. Comparison of the results of experiments with the results of calculations? may lead to new, improved calculation methods and to new methods to describe transient flow. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 8757 |
| title | Possible applications of hardening slurries with fly ash from thermal treatment of municipal sewage sludge in environmental protection structures |
| authors | Paweł Falaciński, Łukasz Szarek |
| pages | 47 — 61 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem63str047.pdf |
| keywords | hardening slurry, cut-off walls, fly ash from thermal treatment of municipal sewage sludge, hydraulic conductivity |
| affiliations | |
| abstracts | In Poland, in recent years, there has been a rapid accumulation of sewage sludge – a by-product in the treatment of urban wastewater. This has come about as a result of infrastructure renewal, specifically, the construction of modern sewage treatment plants. The more stringent regula- tions and strategic goals adopted for modern sewage management have necessitated the appli- cation of modern engineering methodology for the disposal of sewage sludge. One approach is incineration. As a consequence, the amount of fly ash resulting from the thermal treatment of municipal sewage sludge has grown significantly. Hence, intensive work is in progress for environmentally safe management of this type of waste. The aim of the experiment was to evaluate the possibility of using the fly ash that results from municipal sewage sludge thermal treatment (SSTT) as an additive to hardening slurries. This type of hardening slurry with various types of additives, e.g. coal combustion products, is used in the construction of cut-off walls in hydraulic structures. The article presents the technological and functional parameters of hardening slurries with an addition of fly ash obtained by SSTT. Moreover, the usefulness of these slurries is analysed on the basis of their basic properties, i.e. density, contractual viscosity, water separation, struc- tural strength, volumetric density, hydraulic conductivity, compressive and tensile strength. The mandated requirements for slurries employed in the construction of cut-off walls in flood embankments are listed as a usefulness criteria. The article presents the potential uses of fly ash from SSTT in hardening slurry technology. It also suggests directions for further research to fully identify other potential uses of this by-product in this field. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 8731 |
| title | Sediment transport beyond the surf zone under waves and currents of the non-tidal sea: Lubiatowo (Poland) case study |
| authors | Ostrowski R., Stella M. |
| pages | 63 — 77 |
| notes | Kopia w oprac. Tp4452 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem63str063.pdf |
| keywords | wave-induced nearbed oscillations, sea currents, wind-driven current, sand grain diameter, bed shear stresses, friction velocity, sediment transport |
| affiliations | |
| abstracts | The paper deals with the sandy coastal zone at Lubiatowo in Poland (the south Baltic Sea). The study comprises experimental and theoretical investigations of hydrodynamic and lithodynamic processes in the coastal region located close to the seaward boundary of the surf zone and beyond the surf zone. The analysis is based on field data collected at the IBW PAN Coastal Research Station in Lubiatowo. The data consist of wind velocity reconstructed from the long-term wave climate, deep-water wave buoy records and sea bottom soil parameters. Nearbed flow velocities induced by waves and currents, as well as bed shear stresses are theoretically modelled for various conditions to determine sediment motion regimes in the considered area. The paper discusses the possibility of occasional intensive sediment transport and the occurrence of distinct sea bed changes at bigger water depths. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 14 |