Browsing by Author "Balakrishna Rao, K."

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Physical model studies on stability of concrete armoured breakwaters
    (2011) Rao, M.; Rao, S.; Shirlal, K.G.; Prashanth, J.; Balakrishna Rao, K.
    As the breakwater construction started moving in to deeper waters, the wave load on its armour increased resulting in usage of heavier armour units inviting environmental and logistical problems. With the advancement in the technology, concrete armour units have been extensively replacing the natural stones with benefits such as saving in the material and cost while reducing loads on the seabed and helping in construction of environment etc. Tandem breakwater and berm breakwater could be the alternative solutions for the above said case. This paper presents the two cases of physical model studies on the stability of concrete armoured structures, one with tandem breakwater and another on berm breakwater. Both the models are subjected to monochromatic waves with varying characteristics. From the study it was observed that in case of tandem breakwater the crest width of submerged reef and the distance between breakwater and reef are the defining parameter while in case of berm breakwater the height of the berm and its width are the characteristic factors in reducing the breakwater damage. © 2011 Taylor & Francis Group, LLC.
  • No Thumbnail Available
    Item
    Wave run-up, run-down studies on berm breakwater with concrete cubes as armour units
    ([publishername] World Scientific, 2011) Rao, S.; Shirlal, K.G.; Balakrishna Rao, K.; Janardhan, P.
    The basic principle involved in the design of berm breakwater is provision of a wide berm at or around the water level with smaller size stones in the armour, which are allowed to move till an equilibrium slope is achieved. This paper presents the results of experimental studies conducted on the wave run-up, run-down characteristics of berm breakwater using concrete cube as artificial armour unit. The experiments were conducted under following conditions, berm width = 0.45m, water depths 0.37, 0.40 & 0.43m, breakwater slope 1:1.5. The weight of concrete cube is 79.5 gm. The wave heights used in the experiments are 0.10, 0.12, 0.14, and 0.16 m and wave periods are 1.6 and 2.0 sec. From the experimental study it is found that the run-up is more for longer period waves in comparison with the shorter period waves. With the increase in deep water wave steepness the run-up and run-down was found to decrease for all the water depths considered. The run-up values (Ru/Ho) vary from 0.52 to 1.08. The range of run-down values (Rd/Ho) varies from 0.45 to 0.88. In berm breakwater the run-up and run-down values were reduced by 35.91% and 23.81% when compared with conventional rubble mound breakwater. © 2019, World Scientific. All rights reserved.