Study of the Effect of Changing the Elevation of Vegetation With regular layout on Wave Reduction Using Flow-3D Numerical Model

Document Type : Original Article


1 Master's Degree in Engineering, Coastal, Ports & Marine Structures _ Khorramshahr University of Marine Science and Technology

2 Department of Offshore Structures, Faculty of Marine Engineering, Khorramshahr University of Marine Science and Technology

3 Department of Irrigation and Reclamation Engineering, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran.

4 Study Expert, Arvand Water and Energy Consulting Engineers Company, Ahvaz, Iran.


The development of water waves through submerged and non-submerged vegetation is accompanied by a loss of energy through the resistive force of the vegetation, resulting in a decrease in wave height. Wave damping by vegetation is a function of cover characteristics such as geometry and structure, immersion ratio, density, hardness, and spatial arrangement, as well as wave conditions such as input wave height, duration, and wave direction. In the present study, the effect of geometric arrangement of vegetation with variable height on wave damping has been investigated using the Flow 3D numerical model. For this purpose, a channel with a length of 480 cm and a width of 10.8 cm, which has been previously used by Cox and Wu (2015) to study the effect of plant density with variable height on wave damping, is modeled. The operation of the three arrangements, including long to short arrangement, short to long arrangement, and zigzag arrangement, is examined under four different waves, all of which are linear waves. It should be noted that in this study, wave height is considered as an damping index. The results obtained by measuring the height of the waves at four different points along the channel show that the behavior of the waves in dealing with different arrangements follows a fixed pattern and also changes in the geometry of the vegetation can greatly lead to Increase the damping of the waves. The results show that a change in height arrangement can cause a change in damping of up to 7.1%.


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