Sedimentation analysis in the shipping lanes of Tanjung Rhu Port, Belitung

A seawall is a coastal barrier that prevents waves from reaching the shore. The approach of waves increases the height of coastal structures. Coastal protection structures must manage wave run-up to prevent erosion and abrasion adequately. Experiments were conducted to measure wave runup by adjusting the angle of the Seawall and implementing porous concrete armour units. The wave run-up is directly proportional to the slope angle of the structure. The most steeply sloped section with a ratio of 1:1 (0.150 m) produced the highest run-up, followed by a slope ratio of 1:1.5 (0.132 m) and the least steep slope ratio of 1:2 (0.128 m).

Experimental Study of Wave Run-Up for Porous Concrete on Seawall Structures

Sujantoko,

Fuad,

Azzarine

et al. 2024

Test a 2D Physical Model of Seawall Stability at Various Slope Angles with A-Jack Armour Units

Sujantoko,

Pangestu,

Silva

et al. 2024

Seawall designs must consider the type of armour unit, wave height, and economic factors. Selecting the appropriate size and type of protective unit can prevent excessive damage to structures at sea. In this study, the stability of the A-Jack armour unit was analyzed through physical model testing. Among the three structural slope variations in this test, AJack had the highest stability at a slope of 1:2. At a wave height of 0.1 m, the A-Jack was still not damaged, but the Tetrapod suffered damage of 0.43% and the BPPT-Lock of 0.83%. Antifer type 2 has a damage percentage of 2.3% with a stability number of 2.23, whereas A-Jack causes damage of 5.35% with a stability number of 2.26. As the stability coefficient decreases with increasing structural steepness, A-Jack has better stability than the Antifer.

Numerical Modeling of the Effect of Porosity on Mooring Tensions in a Porous Double-slope Floating Breakwater

Sujantoko,

Djatmiko,

Khadijah

et al. 2024

A floating breakwater is a structure used to solve existing problems due to activities around the coast. Floating breakwaters are becoming a more attractive alternative because of their mobility, costeffectiveness in deep coastal waters, and reduced impact on the marine environment. Floating breakwaters consist of floaters with buoyancy to support facilities above the water surface. Floating breakwaters are moored when operating on the high seas using conventional mooring systems or mooring lines. In this study, a numerical investigation of the mooring tension was conducted on a porous double-slope floating breakwater with variations in porosity in the configuration of the mooring ropes of the marine system. Based on the results of numerical testing, it can be seen that the greater the porosity level, the greater the resulting maximum tension. At 5% and 10% porosity, the maximum tensions are 83.12 and 76.14 N on a 45° slope and 82.46 and 82.95 N on a 60° slope, respectively.