| ATTRIBUTE | VALUE |
|---|---|
| type | C |
| database id | 8872 |
| title | |
| authors | |
| affiliations | |
| year | 2017 |
| series | Archives of Hydro-Engineering and Environmental Mechanics |
| issue | Vol. 64, No. 1 |
| publisher | Wydawnictwo IBW PAN |
| place | Gdańsk |
| attributes | [published] [reviewed] [scientific] [international reach] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 8876 |
| title | A numerical study of non-hydrostatic shallow flows in open channels |
| authors | Yebegaeshet T. Zerihun |
| pages | 17 — 35 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem64str017.pdf |
| keywords | turbulent flow, numerical modelling, non-hydrostatic pressure, rapidly-varied flow, hydraulic structures |
| affiliations | |
| abstracts | The flow field of many practical open channel flow problems, e.g. flow over natural bed forms or hydraulic structures, is characterised by curved streamlines that result in a non-hydrostatic pressure distribution. The essential vertical details of such a flow field need to be accounted for, so as to be able to treat the complex transition between hydrostatic and non-hydrostatic flow regimes. Apparently, the shallow-water equations, which assume a mild longitudinal slope and negligible vertical acceleration, are inappropriate to analyse these types of problems. Besides, most of the current Boussinesq-type models do not consider the effects of turbulence. A novel approach, stemming from the vertical integration of the Reynolds-averaged Navier-Stokes equations, is applied herein to develop a non-hydrostatic model which includes terms accounting for the effective stresses arising from the turbulent characteristics of the flow. The feasibility of the proposed model is examined by simulating flow situations that involve non-hydrostatic pressure and/or nonuniform velocity distributions. The computational results for free-surface and bed pressure profiles exhibit good correlations with experimental data, demonstrating that the present model is capable of simulating the salient features of free-surface flows over sharply-curved overflow structures and rigid-bed dunes. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 8877 |
| title | Modal analysis of a steel radial gate exposed to different water levels |
| authors | Krzysztof Brusewicz, Witold Sterpejkowicz-Wersocki, Robert Jankowski |
| pages | 37 — 47 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem64str037.pdf |
| keywords | modal analysis, radial gate, dynamic loads |
| affiliations | |
| abstracts | With the increase in water retention needs and planned river regulation, it might be important to investigate the dynamic resistance of vulnerable elements of hydroelectric power plants, including steel water locks. The most frequent dynamic loads affecting hydroengineering structures in Poland include vibrations caused by heavy road and railway traffic, piling works and mining tremors. More destructive dynamic loads, including earthquakes, may also occur in our country, although their incidence is relatively low. However, given the unpredictable nature of such events, as well as serious consequences they might cause, the study of the seismic resistance of the steel water gate, as one of the most vulnerable elements of a hydroelectric power plant, seems to be important. In this study, a steel radial gate has been analyzed. As far as water gates are concerned, it is among the most popular solutions because of its relatively small weight, compared to plain gates. A modal analysis of the steel radial gate was conducted with the use of the FEM in the ABAQUS software. All structural members were modelled using shell elements with detailed geometry representing a real structure. Water was modelled as an added mass affecting the structure. Different water levels were used to determine the most vulnerable state of the working steel water gate. The results of the modal analysis allowed us to compare the frequencies and their eigenmodes in response to different loads, which is one of the first steps in researching the dynamic properties of steel water gates and their behaviour during extreme dynamic loads, including earthquakes. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 8878 |
| title | Strupczewski method for parametric design hydrographs in ungauged cross-sections |
| authors | Wiesław Gądek, Beata Baziak, Tamara Tokarczyk |
| pages | 49 — 67 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem64str049.pdf |
| keywords | nonparametric design hydrograph, Archer method, parametric design hydrograph, flow descriptor, Strupczewski method, UPO ERR Gamma curve |
| affiliations |
|
| abstracts | Nonparametric hydrographs, constructed by the method suggested by Archer, are usually used
for developing parametric design hydrographs. Flow changes in time are described by the UPO
ERR Gamma complex function, which denotes a Gamma curve reformulated to have a Unit
Peak at the Origin (abbreviated to UPO), supplemented by the Exponential Replacement Recession (ERR) curve. It may be observed, that this solution does not work in some areas of the upper Vistula and middle Odra catchments when the times of the rising limb of a hydrograph are higher than the times of the falling limb, i.e. when the skewness coefficient approximates 0.5 or higher values. Better results can be achieved with the function suggested by Strupczewski in 1964. It is a solution which uses two parameters of the flood hydrograph. The objective of the present paper is to assess the Strupczewski method by comparing it with a complex UPO ERR Gamma function for gauged cross-sections in the upper Vistula and middle Odra catchments. The assessment was carried out for 30 gauged cross-sections (15 in each river catchment). The parameters were optimized for width-hydrograph descriptors W75 and W50, designed by the Archer method, and for the skewness coefficient s. Optimization using only two width-hydrograph descriptors aims to test how the Strupczewski method works for cross-sections for which the values of width-hydrograph descriptors W75 and W50 are known. The assessment of both methods was carried out with reference to a nonparametric hydrograph constructed by the Archer method. The results of these assessments suggest that the Strupczewski method may be used not only for gauged cross-sections, but also for ungauged ones. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 8800 |
| title | Analysis of dune erosion on the coast of south Baltic Sea with taking into account dune landslide processes |
| authors | Szmytkiewicz P., Zabuski L. |
| pages | 3 — 15 |
| DOI | 10.1515/heem-2017-0001 |
| notes | Kopia w oprac. Tp4451 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem64str003.pdf |
| keywords | South Baltic coastal zone, dunes, erosion, landslide process |
| affiliations | |
| tasks | Z 2.1.2/2016: Adaptacja modelu XBeach do oceny stopnia bezpieczeństwa brzegów wydmowych południowego Bałtyku |
| abstracts | An analysis was carried out to determine the influence of landslide process at a few meters depth under the dune surface on the rebuilding of the dune. In the first step, calculations were done using the XBEACH model to determine seabed rebuilding as well as shore and dune undercutting for the assumed hydrologic and hydrodynamic conditions. Next, the obtained tachymetric profile of the dune and beach was fed into the FLAC2D program, and calculations of stress distribution, displacements and stability conditions were made. In this way, landslide movement was identified. The theoretical investigations clearly prove that waves attacking the dune not only cause surface erosion, but also trigger a landslide within the dune mass to a maximum depth of about 5 m. It results in a lowering of the dune crown by about 0.6 ÷ 0.7 m. Numerical models such as XBEACH, SBEACH or CSHORE do not take into account landslide occurrence, and thus underestimate dune erosion. |
| attributes | [reviewed] [scientific] |
| language | en |