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Vpliv valov zaradi plovbe na obremenitve in stabilnost brežin : diplomska naloga
Ušaj, Ivo (Author), Žagar, Dušan (Mentor) More about this mentor... This link opens in a new window

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Abstract
V diplomski nalogi prikazujemo nastanek in značilnosti valov zaradi plovbe pri različnih pogojih. Valovi, ki se delijo na primarne in sekundarne, so odvisni predvsem od vrste ladje, hitrosti, geometrije ladijskega trupa in razdalje, na kateri opazujemo valove zaradi gibanja ladje. Najvišji valovi nastajajo vzdolž dveh stičnih linij, kjer se stikajo divergirajoči in prečni valovi. Za izračun največje višine vala smo preverjali veljavnost Bhowmikove enačbe, ki je odvisna od različnih parametrov in deluje ob številnih predpostavkah. Prikazujemo, kako na podlagi največje višine izračunamo energijo vsakega vala valovnega niza na enoto površine, kar je ključnega pomena pri izračunu skupne energije valov zaradi plovbe, ki na določenem območju obremenjujejo brežine. Vodilna parametra pri vrednotenju morebitne erozije in škode na objektih sta tudi perioda vala in valovna dolžina, ki sta odvisni od globine vode. Za globoko vodo in prehodno območje smo izračunali periode in valovne dolžine valov dveh tipičnih tovornih ladij. V kanalih in v plitvi vodi pride pogosto do pojava, ki mu z angleško besedo pravimo »squat«. Gre za kombinacijo vertikalnega pomika in zasuka ladje preko krme ali premca. Pojav je predvsem posledica plovbe v plitvi vodi in neenakomerne porazdelitve tlakov vzdolž ladijskega trupa. Za geometrijsko enostavne plovne kanale prikazujemo izračun vertikalnega pomika, ki ga lahko izračunamo na zelo enostaven način.

Language:Slovenian
Keywords:valovi, plovila, brežine, obremenitve, stabilnost
Work type:Bachelor thesis/paper (mb11)
Tipology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2019
Publisher:I. Ušaj]
UDC:627.223.6:629.542(497.4)(043.2)
COBISS.SI-ID:8905825 Link is opened in a new window
Views:44
Downloads:13
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Secondary language

Language:English
Title:Impact of ship-induced waves on bank loads and stability : graduation thesis
Abstract:
In the thesis, we analyse generation and characteristics of ship-induced waves in various sailing conditions. These waves, classified as the primary and the secondary, depend particularly on the type of vessel, sailing speed, hull geometry and the distance between the sailing line and the measurement point. The maximum wave heights occur along the two cusp locus lines, where the transverse and diverging waves meet. We questioned the validity of the Bhowmik equation for calculation of the wave heights. The equation depends on pre-defined parameters and can only be used by considering numerous assumptions. Knowing the maximum wave height, we can define the energy of every wave in the wave train per unit area and further calculate the total amount of energy produced from the ship waves. To estimate the bank erosion and damage to the water structures we analyse two key parameters: the wave period and the wave length, which depend on water depth. We calculated the wave periods and wave lengths for two typical cargo ships in deep and intermediate-depth water. A phenomenon called “squat” often occurs in navigation channels and in shallow water. It is a combination of ship sinkage and trim over the bow or the stern due to non-uniform pressure distribution and navigation in shallow water. For navigation channels of simple geometric we show a simple procedure for calculating the ship's sinkage.

Keywords:waves, ships, banks, loads, stability

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