Faculty Publications

Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736

Publications by NITK Faculty

Browse

Author: search.filters.author.Hegde, A.V.Subject: search.filters.subject.experimental study

Search Results

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Mooring forces in horizontal interlaced moored floating pipe breakwater with three layers
    (2008) Hegde, A.V.; Kamath, K.; Deepak, J.C.
    The paper presents the results from model scale experiments on the study of forces in the moorings of horizontally interlaced, multi-layered, moored floating pipe breakwaters. The studies are conducted with breakwater models having three layers subjected to waves of steepness Hi/L (Hi is the incident wave height and L the wavelength) varying from 0.0066 to 0.0464, relative width W/L (W is the width of breakwater) varying from 0.4 to 2.65, and relative spacing S/D (S is the spacing of pipes and D the diameter of pipe) of 2 and 4. The variation of measured normalized mooring forces on the seaward side and leeward side are analyzed by plotting non-dimensional graphs depicting f/?W2 (f is the force in the mooring per unit length of the breakwater, ? the weight density of sea water) as a function W/L for various values of Hi/d (d is the depth of water). It is found that the force in the seaward side mooring increases with an increase in Hi/L for d/W values ranging between 0.081 and 0.276. The experimental results also reveal that the forces in the seaward side mooring decrease as W/L increases, up to a value of W/L=1.3, and then increases with an increase in W/L. It is also observed that the wave attenuation characteristics of breakwater model with relative spacing of 4 is better than that of the model with relative spacing of 2. The maximum force in the seaward side mooring for model with S/D=4 is lower compared to that for the breakwater model with S/D=2. A multivariate non-linear regression analysis has been carried out for the data on mooring forces for the seaside and leeside. © 2007 Elsevier Ltd. All rights reserved.
  • No Thumbnail Available
    Item
    Development of prediction models for hydrodynamic performance of semicircular breakwater
    (2012) Aggarwal, A.; Gope, V.K.; Managiri, S.S.; Hegde, A.V.
    Breakwaters are structures built to protect harbors, shore areas, basins, and other areas from the fury of sea waves. They create calm waters and provide for the safe mooring and handling of ships, as well as protection to harbor facilities. The main function of a breakwater is the formation of an artificial harbor. Of late, certain new types of breakwaters have been constructed to cater to the tranquility requirements of managing marine traffic in ports. The semicircular breakwater (SBW) is one such new type of breakwater. The semicircular breakwater possesses a round top and, thus, offers more stability against the action of waves. It is expected that the SBW will be well suited as an offshore breakwater designed to protect beaches from coastal erosion. A number of experiments were conducted on scaled-down physical models of SBW for different values of parameters such as wave height H, wave period T, spacing of perforations on the seaside, etc. (radius of breakwater and diameter of perforations were kept constant), and data were collected. The paper presents the prediction models/equations for hydrodynamic performance characteristics such as reflection coefficient and relative wave runup, using the data obtained by a regression approach in MATLAB.
  • No Thumbnail Available
    Item
    Transmission studies on horizontal interlaced multi-layer moored floating pipe breakwater (HIMMFPB) with three layers of pipes
    (2013) Hoolihalli, M.V.; Hegde, A.V.
    Present study consists part of the series of physical model scale experiments conducted for the study of the transmission characteristics of horizontal interlaced multi-layer moored floating pipe breakwater (HIMMFPB). Studies were conducted on physical models of the floating breakwater with three layers of PVC pipes, wave steepness, Hi/gT2 (Hi=incident wave height, g=acceleration due to gravity and T=wave period) varying from 0.063 to 0.936; relative width, W/L (W=width of the breakwater) varying from 0.4 to 2.65 and relative spacing of pipes, S/D=2 (S=horizontal c/c spacing of pipes and D=diameter of the pipes). Transmitted wave height is measured and the collected data is analyzed by plotting non-dimensional graphs depicting the variation of Kt (transmission coefficient) with Hi/gT2for various values of d/W (d=water depth) varying from 0.082 to 0.276 and Kt with W/L for different values of Hi/d which was varied from 0.06 to 0.450. It is observed that Kt decreases as Hi/gT2 increases for the range of d/W values used in the study. It is also observed that Kt decreases with an increase in W/L for the range of Hi/d values used. Maximum wave attenuation achieved in the study with the present breakwater configurations is 78.62%.