ايليا اريان فر

Amid escalating climate threats such as rising sea levels, intensifying storms, an‎d the degradation of coastal marine ecosystems, submerged artificial reefs have become an increasingly important engineering solution for reducing wave energy an‎d protecting shorelines. This study investigates the hydrodynamic behavior of submerged porous artificial reefs with different structural configurations through physical experiments, focusing on wave transmission, reflection, an‎d energy dissipation. A series of scaled physical models, labeled A to E, were tested in a wave flume. These models were designed with variations in porosity, internal geometry, an‎d crest width to separately assess the effect of each factor on hydrodynamic performance. Structure A was fully permeable. Structure B included one central impermeable plate, structure C had two central impermeable plates, structure D featured two impermeable side plates, an‎d structure E was built with two semi-permeable internal plates. The analysis showed that the presence of internal impermeable plates plays a key role in reducing wave transmission an‎d reflection while enhancing energy dissipation. Structures with more complex internal configurations created greater flow interference an‎d turbulence within the reef body, leading to more effective wave energy attenuation. Structure C exhibited the best performance, followed by structures D an‎d B, while structure A showed the weakest performance due to its fully porous design an‎d lack of internal resistance. These differences were especially significant under low-porosity conditions. It was also observed that lower porosity an‎d wider crest width, particularly in shallow water, substantially improved performance. In terms of wave reflection, symmetric porosity on both sides of the structure helped minimize reflection, while asymmetric porosity increased it due to induced flow instability. eva‎luation of the empirical Van Gent equation showed that it only provided accurate predictions for structures A an‎d E at high porosity levels, whereas it aligned more consistently with experimental results for internally structured models B, C, an‎d D across all porosities. Overall, the findings suggest that internal configuration, porosity, an‎d geometric dimensions such as crest width can work together to optimize the wave energy dissipation performance of submerged artificial reefs. This integrated approach provides effective strategies for the sustainable design of coastal protection structures.

صخره مصنوعي مستغرق , ضريب عبور موج , تخلخل , پيكربندي داخلي سازه , مدل فيزيكي

Submerged Artificial Reef , Wave Transmission Coefficient , Porosity , Internal Configuration , Physical Model

Ilia Aryanfar

Dr.Seyed Mostafa Siadatmousavi