| ATTRIBUTE | VALUE |
|---|---|
| type | C |
| database id | 3848 |
| title | |
| authors | |
| affiliations | |
| year | 2001 |
| series | Archives of Hydro-Engineering and Environmental Mechanics |
| issue | Vol. 48, No. 4 |
| publisher | Wydawnictwo IBW PAN |
| place | Gdańsk |
| attributes | [published] [reviewed] [scientific] [international reach] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 4377 |
| title | Boundary problem for equations of steady gradually varied flow in open channels |
| authors | Romuald Szymkiewicz |
| pages | 23 — 37 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem48no4str023.pdf |
| affiliations | |
| abstracts | In this paper the problem of solution of ordinary differential equations describing a steady, gradually varied flow is discussed. It is shown that, apart from the initial problem usually solved for open channels, the formulation of the boundary problem is necessary when water levels are imposed at ends of channel. This approach is the mathematically correct formulation of the solution problem for steady, gradually varied flow equations. It enables us to determine directly the water profile and discharge for a single channel, as well as for channel network, instead of the trial and error method usually used. Moreover the formulation of boundary problem with respect to the Manning coefficient and lateral inflow is presented. To solve the listed problems the finite differences method is used. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 4376 |
| title | Real-time forecasting of water levels using adaptive neuro-fuzzy systems |
| authors | D. K. Gautam, K. P. Holz, Zygmunt Meyer |
| pages | 3 — 21 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem48no4str003.pdf |
| affiliations | |
| abstracts | Real-time forecasting of high water levels at the mouth section of the Odra river is important for the safety conditions of shipping, shipyard works, river banks protection, flood control and overall management of aquatic environment in the area. While numerical hydrodynamic models offer one possible solution, such models require forecasting of all boundary conditions and forcing data, calibration of model parameters and are often too complex and time consuming. These models are not very suitable for real-time forecasting where fast solutions are required to provide adequate lead time. Simpler approaches offered by artificial intelligence methods such as artificial neural networks and fuzzy rule-based systems are thus becoming more attractive and promising alternatives. These methods provide a fast, sufficiently good and low-cost solution. In this paper, an application of Adaptive-Network-Based Fuzzy Inference System (ANFIS) is presented for real-time forecasting of water levels at Police on the mouth section of the Odra river. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 3849 |
| title | A note on radiation conditions for narrow-band random waves generated in fluid of constant depth |
| authors | Szmidt J. K. |
| pages | 39 — 55 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem48no4str039.pdf |
| affiliations | |
| abstracts | In the paper, the generation of narrow-band random waves in a semi-infinite layer of fluid is considered. The problem is formulated in a discrete space of chosen points by means of the finite difference method. The main goal of the investigations is to construct radiation boundary conditions which enable us to replace the infinite fluid area with a finite domain. The investigations are illustrated with experimental results and numerical examples confirming efficiency of the discrete model developed in the paper. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 6 |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 4378 |
| title | Flow characteristics of homogeneous mixture in laminar flow zone |
| authors | Jan Kempiński |
| pages | 57 — 68 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem48no4str057.pdf |
| affiliations | |
| abstracts | Knowledge of the rheological characteristics of a mixture enables the defining of hydraulic losses in horizontal pipelines on the basis of dimensionless criterion type λ (Regen), where λ is the pipe resistance dimensionless coefficient from the Darcy-Weisbach formula and Regen is the generalized Reynolds number for the adopted rheological model. In order to describe the rheological character of plastic and viscous mixtures, the 3-parameter generalized Herschel-Bulkley model was applied. The complete generalized Reynolds number ReH for the Herschel-Bulkley model was formulated. The estimation of relative error ReH value determination for the laminar flow was conducted for two cases: when the yield point τ0 is taken into account and when it is not considered. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 3850 |
| title | On the generation of water waves in a flume |
| authors | Wilde P., Wilde M. |
| pages | 69 — 83 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem48no4str069.pdf |
| affiliations | |
| abstracts | The present paper proposes a simple model for the calculation of a time series to control the horizontal motion of the piston of a wavemaker. It is assumed that the initial conditions correspond to water at rest. It is assumed that parameters of kinematics of the fluid (displacement, velocity and acceleration fields) at the initial time are equal to zero. In the first interval the amplitudes grow to an asymptote that corresponds to a regular monochromatic wave. In the second interval the waves decay. Calculated time series were fed in to the control system of our wavemaker and the measured horizontal displacements of the piston compared. The control series was supplemented by terms corresponding to the Stokes type solution by addition of terms with multiples of the basic frequency. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 6 |
| ATTRIBUTE | VALUE |
|---|---|
| type | A |
| database id | 4379 |
| title | Simplified modelling of heat transfer in groundwater |
| authors | Jerzy M. Sawicki |
| pages | 85 — 102 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem48no4str085.pdf |
| affiliations | |
| abstracts | The paper deals with a 2D mathematical model, which describes the groundwater temperature. Such a model is an interesting alternative for 3D equations, which require much more additional information (i.e. shape and characteristics of the area, initial and boundary conditions) than 2D equations. In the first part of the paper the equations of energy conservation for two main versions of a 2D model (i.e. for a confined and for an unconfined area) were derived. Special attention was paid to two kinds of heat-transfer processes, viz. micro-dispersion, caused by pore-space averaging of the temperature and velocity, and macro-dispersion, due to averaging along the water-layer depth. The analysis of the thermal conditions in the region of the Kozienice electric-power-plant was presented, as an example of the model application. |
| attributes | [reviewed] [scientific] |
| language | en |