Directional Kinematics Flow and Base Scouring on Hybrid Engineering Structure Experimentally

Abstract

Hybrid Engineering is a technology that utilizes natural resources around the coast or river by using materials in the form of twigs or branches from mangroves which are cut and arranged to form a breakwater structure. This study aims to determine the effectiveness of hybrid engineering technology to be applied to groyne struktur to reduce longshore currents and river flow. The application of hybrid engineering as a breakwater and sediment trap in coastal areas has given good results so that it can be developed in permeable groynes.

The research was conducted experimentally in the hydraulic laboratory with physical modeling to investigation basic scouring on hybrid engineering structures with several model scenarios by changing the characteristics of brushwood structure in the form of density or pearmebility and finding variables that significantly affect base scouring, namely velocity (V), water level (h), structure length (B) and grain size sediment (d50) as well as analyzing the relationship between these parameters so that a dimensionless parameter formula is found that is used to describe the relationship. To obtain the relationship between the influential parameter and depth scouring (ds), a dimensionless parameter of relative depth scouring ds/B is used for several influencing parameters. The results obtained are that the relative depth scouring (ds/B) will be greater because it is influenced by the smaller the permeability ratio of the structure and the larger the diameter of the sediment grains.