Browsing by Author "Janardhan, P."

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    Reshaping berm breakwaters: A physical model study
    (National Institute of Science Communication and Policy Research, 2018) Janardhan, P.; Rao, S.; Shirlal, K.G.
    In the present study, the structural stability of statically stable reshaping berm breakwater for different wave parameters and armour weights were verified by physical model study carried out at NITK Surathkal Mangalore. Wave run-up and rundown studies were also carried out. The results show that a safe structure can be evolved with reduction in armour weight by up to 25% for all the relative berm position values. The position of berm greater than or equal to 1.3 was found to be good in reducing recession as well as wave run-up. An empirical new berm recession formula was derived for berm recession based on sea state and structural parameters. © 2018, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.
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    Wave run-up, run-down studies on berm breakwater with concrete cubes as armour units
    (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.
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    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.