Related Experiment Video
Updated: Feb 17, 2026
10:53
Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
Published on: March 12, 2019
7.6K
Stochastic sediment property inversion in Shallow Water 06.
1Department of Mathematical Sciences, New Jersey Institute of Technology, Newark, New Jersey 07102, USA michalop@njit.edu.
The Journal of the Acoustical Society of America
|December 3, 2017
Summary
This study uses Gibbs sampling to estimate acoustic path arrival times. These estimates improve underwater source localization and sediment property inversion, quantifying uncertainty.
Area of Science:
- Ocean acoustics
- Geophysical inverse theory
Background:
- Acoustic signals reveal underwater environments.
- Identifying distinct signal paths is crucial for accurate environmental parameter estimation.
Purpose of the Study:
- To estimate acoustic path arrival times and associated probability densities using Gibbs sampling.
- To determine source and water column properties using linearized inverse methods.
- To invert for sediment properties and quantify uncertainty.
Main Methods:
- Gibbs sampling for arrival time and probability density estimation.
- Linearized inverse problem for source and water properties.
- Non-linear, grid-based model for sediment property inversion.
Main Results:
- Accurate estimation of arrival times for direct, surface, bottom, and sediment reflection paths.
- Quantified probability densities for source range, depth, water depth, and sound speed.
- Derived densities and point estimates for sediment sound speed and thickness.
Conclusions:
- Gibbs sampling effectively estimates acoustic path parameters.
- The method provides robust inversion for underwater source and sediment properties.
- Density computation is vital for expressing uncertainty in sediment property inversions.
Related Concept Videos
01:11Buoyancy and Stability for Submerged and Floating Bodies
2.6K
In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
2.6K
01:18Uniform Depth Channel Flow: Problem Solving
532
To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
532
01:30Typical Model Studies
644
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.
644
01:07Damped Oscillations
7.4K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Although friction and other non-conservative...
7.4K
01:27Uniform Depth Channel Flow
641
Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
641
01:27Energy Considerations in Open Channel Flow
639
Open channel flow, where a fluid flows with a free surface exposed to the atmosphere, is primarily governed by gravitational and surface effects, distinguishing it from closed conduit or pipe flow. In open channels such as rivers, canals, and artificial channels, energy analysis provides valuable insights into flow behavior and the relationship between depth, velocity, and slope.Specific Energy and Flow DepthIn open channel flow, the specific energy, E, combines the gravitational potential...
639