Hydrodynamic performance assessment of emerged and sub-merged semicircular breakwaters under random waves: An experimental and empirical study
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.Semicircular breakwater (SBW) models offer effective coastal protection by reducing wave energy. An emerged SBW configuration (d/h=0.667) demonstrated superior wave attenuation compared to submerged designs.
Area Of Science
- Coastal engineering
- Marine hydrodynamics
- Ecosystem preservation
Background
- Coastal protection structures are vital for safeguarding populations against wave energy and rising sea levels.
- Mangrove ecosystems require effective protection strategies to thrive and expand.
Purpose Of The Study
- Investigate the hydrodynamic characteristics of semicircular breakwater (SBW) models.
- Develop empirical equations for predicting SBW hydraulic performance.
- Enhance coastal protection to support mangrove ecosystem preservation and expansion.
Main Methods
- Physical model experimentation in a wave flume.
- Assessment of SBW performance under random wave conditions.
- Testing various relative water depths (d/h = 0.667, 1.000, 1.333, 1.667), wave steepness (0.02–0.06), and wave periods (0.8–2.5 s).
Main Results
- The emerged SBW (d/h = 0.667) exhibited significantly better wave attenuation than submerged configurations.
- Transmission, reflection, and energy loss coefficients were analyzed across different wave and depth conditions.
- Empirical relationships for SBW hydraulic characteristics were developed.
Conclusions
- Emerged SBW designs are highly effective for wave energy dissipation.
- SBW models can be optimized to enhance coastal protection and support mangrove restoration.
- This research provides valuable data for designing resilient coastal defense systems.
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
Related Concept Videos
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
Practical constraints, however, can introduce geometric distortions, impacting how accurately these models represent the real system. Adjustments, such as...
Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
Through this controlled setup, researchers can closely examine how water flows over the spillway, supporting a detailed analysis of its performance. A fundamental principle behind these models is using...
Water flow in open channels is often measured using hydraulic structures such as weirs, which allow precise calculation of discharge. In a rectangular channel, flow rates are measured using three types of weirs: rectangular sharp-crested, triangular sharp-crested, and broad-crested. The weir head is set at a fixed height above the channel bottom, simplifying calculations and enabling the relationship between depth and flow rate to be analyzed.For the rectangular sharp-crested weir, the flow...
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...