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Related Concept Videos

Residual Plots01:07

Residual Plots

6.5K
A residual plot is a statistical representation of data used to analyze correlation and regression results. It helps verify the requirements for drawing specific conclusions about correlation and regression. To obtain the residual plot, first, the residual for each data value is calculated, which is simply the vertical distance between the observed and the predicted value obtained from the regression equation.
When the residual values are plotted against the variable x, it is called a residual...
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Residual Stresses01:26

Residual Stresses

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Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
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Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

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In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
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Residual Stresses in Bending01:18

Residual Stresses in Bending

582
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
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Residuals and Least-Squares Property01:11

Residuals and Least-Squares Property

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The vertical distance between the actual value of y and the estimated value of y. In other words, it measures the vertical distance between the actual data point and the predicted point on the line
If the observed data point lies above the line, the residual is positive, and the line underestimates the actual data value for y. If the observed data point lies below the line, the residual is negative, and the line overestimates the actual data value for y.
The process of fitting the best-fit...
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Environmental Applications of Microorganisms01:30

Environmental Applications of Microorganisms

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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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Environmental dredging residual generation and management.

Clay Patmont1, Paul LaRosa2, Raghav Narayanan3

  • 1Anchor QEA, Seattle, Washington, USA.

Integrated Environmental Assessment and Management
|February 6, 2018
PubMed
Summary

Understanding post-dredging residuals is key to successful environmental dredging. Sediment fluidity, measured by dry bulk density, significantly influences residual magnitude, but effective site-specific management plans can control contamination risks.

Keywords:
Contaminated sedimentDredging residualsEnvironmental dredgingPostdredging residualsResidual management

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Area of Science:

  • Environmental Science
  • Sedimentology
  • Environmental Engineering

Background:

  • Environmental dredging project success hinges on managing remaining sediment contamination, known as post-dredging residuals.
  • Post-dredging residuals are a mixture of sediments from the entire dredge cut, exhibiting fluid mud properties that can spread contamination.
  • Understanding and managing these residuals is crucial for minimizing environmental impact.

Purpose of the Study:

  • To review and analyze robust dredging residual evaluations from recent projects in the US and Canada.
  • To improve the understanding of dredging residual formation and its contributing factors.
  • To inform the evaluation, selection, design, and implementation of dredging remedies.

Main Methods:

  • Review of data from recent dredging projects with comprehensive characterization programs.
  • Analysis of case studies including the Hudson River, Lower Fox River, Ashtabula River, and Esquimalt Harbour.
  • Evaluation of the relationship between site conditions, particularly sediment fluidity (dry bulk density), and residual magnitude.

Main Results:

  • Post-dredging residuals are a mixture of sediments from the dredge cut with fluid mud properties.
  • Sediment fluidity, indicated by dry bulk density, is a primary determinant of residual magnitude.
  • Residual generation is unavoidable but manageable through site-specific plans.

Conclusions:

  • Improved models for dredging residual formation can be developed based on robust data.
  • Site-specific management plans are essential for the successful and efficient management of dredging residuals.
  • Effective management of post-dredging residuals ensures the success of environmental dredging projects.