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Related Concept Videos

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Design Example: Design of an Irrigation Channel

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Trapezoidal channels are widely used in irrigation systems due to their cost-effectiveness and efficiency in conveying water. Trapezoidal channels feature a flat bottom and sloping sides, making them stable and easier to construct compared to other shapes. The bottom width and side slope ratio are determined based on the required flow capacity and site conditions. The side slope is kept gentle for unlined channels to prevent soil erosion.Hydraulic parameters in channel design include the flow...
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The three-compartment open model is a pharmacokinetic model used to describe the distribution and elimination of drugs following extravascular administration. It comprises a central compartment representing the plasma and two peripheral compartments. The highly perfused peripheral compartment represents organs and tissues with a rich blood supply, such as the liver, kidneys, and lungs. The scarcely perfused peripheral compartment represents tissues with lower blood supply, such as adipose...
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Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

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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.
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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.
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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

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This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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Related Experiment Video

Updated: Oct 25, 2025

Author Spotlight: Advancing Coral Culture - Creating a Semi-Quantitatively Controlled Microenvironment System to Counter Current Limitations
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Using the Goldilocks Principle to model coral ecosystem engineering.

S J Hennige1, A I Larsson2, C Orejas3

  • 1Changing Oceans Group, School of GeoSciences, University of Edinburgh, Edinburgh, UK.

Proceedings. Biological Sciences
|August 10, 2021
PubMed
Summary

Coral reef structures rely on a balance of live and dead coral. This study applies the

Keywords:
Goldilocks PrincipleLophelia pertusacoralflow velocityparticle image velocimetrysmoothed-particle hydrodynamics modelling

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Area of Science:

  • Marine Biology
  • Ecosystem Dynamics
  • Hydrodynamics

Background:

  • Reef-forming corals are crucial for marine biodiversity and ecosystem services.
  • The structural integrity and function of coral reefs depend on the ratio of live to dead coral.
  • Understanding this ratio is key to predicting reef health and stability.

Purpose of the Study:

  • To model how the live:dead coral ratio influences reef systems.
  • To apply the 'Goldilocks Principle' to coral reef hydrodynamics.
  • To investigate coral self-optimization of flow requirements through habitat engineering.

Main Methods:

  • Utilized particle imaging velocimetry (PIV) data.
  • Employed numerical smooth particle hydrodynamic (SPH) modeling.
  • Incorporated two fundamental rules within the SPH model.

Main Results:

  • Demonstrated the applicability of the 'Goldilocks Principle' to a model reef system.
  • Showcased how corals optimize local flow conditions via habitat engineering.
  • Quantified the impact of live:dead coral ratios on reef hydrodynamics.

Conclusions:

  • Coral reef growth and stability are governed by the live:dead coral ratio, influenced by flow dynamics.
  • The 'Goldilocks Principle' provides a framework for understanding coral self-regulation of environmental conditions.
  • Advanced modeling approaches can predict the future growth and mortality of coral reef frameworks.