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Related Concept Videos

Stress Concentrations01:24

Stress Concentrations

743
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
743
Stress Concentrations01:13

Stress Concentrations

704
The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress...
704
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

630
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
630
Principal Stresses01:24

Principal Stresses

888
The graphical depiction of normal and shearing stress equations is represented by a circle, demonstrating the interplay between these stresses under different angular conditions. The center of this circle C, located on the vertical axis, represents the average normal stress, while its radius shows the range of stress variations. At points A and B, where the circle intersects the horizontal axis, the maximum and minimum normal stresses are observed, occurring without shearing stress. These...
888
Typical Model Studies01:30

Typical Model Studies

649
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.
649
General State of Stress01:21

General State of Stress

706
The general state of stress within a material can be accurately depicted using a stress tensor. This tensor encapsulates the internal forces distributed within a material subjected to external forces or deformations.
Specifically, consider a tetrahedral element where one face, labeled XYZ, is perpendicular to the line OA, and the remaining faces align with the coordinate axes with point O as the origin. At any point, such as point O, the stress tensor can be used to determine the stress...
706

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Related Experiment Video

Updated: Feb 24, 2026

Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon
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Groundwater Development Stress: Global-Scale Indices Compared to Regional Modeling.

William M Alley1, Brian R Clark2, David M Ely3

  • 1National Ground Water Association, 601 Dempsey Road, Westerville, OH, 43081.

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|August 16, 2017
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This summary is machine-generated.

Global assessments of groundwater stress using simple indices are improving with new data. Regional analyses offer a more detailed understanding of groundwater depletion, complementing global studies.

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Area of Science:

  • Hydrology
  • Water Resource Management
  • Environmental Science

Background:

  • Global datasets and technologies like GRACE satellites enable global water availability assessments using water stress indices.
  • These indices, initially for surface water, are increasingly applied to global groundwater resources.
  • Existing global assessments may not fully capture regional complexities of groundwater use.

Purpose of the Study:

  • To compare global groundwater development stress indices with regional water budget analyses.
  • To evaluate the value of regional-scale analyses in supplementing global hydrological and GRACE data.
  • To highlight the limitations of global indices in representing complex groundwater systems.

Main Methods:

  • Comparison of groundwater development stress indices in three major US agricultural areas.
  • Utilizing regional water budgets derived from detailed groundwater modeling.
  • Analyzing scale effects, groundwater flow dynamics, agricultural system complexities, and socioeconomic factors.

Main Results:

  • Regional-scale analyses provide a more nuanced understanding of groundwater stress than global indices alone.
  • Groundwater modeling at the regional level better accounts for local factors influencing water use.
  • Global indices can be enhanced by incorporating insights from regional assessments.

Conclusions:

  • Regional-scale analyses are crucial for a comprehensive understanding of groundwater depletion.
  • Integrating regional and global approaches will significantly improve knowledge of global groundwater issues.
  • Future groundwater resource management should strategically combine both global and regional modeling efforts.