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Design and Construction of an Urban Runoff Research Facility
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How urban form impacts flooding.

Sarah K Balaian1, Brett F Sanders2,3, Mohammad Javad Abdolhosseini Qomi4,5

  • 1Department of Civil and Environmental Engineering, University of California, Irvine, Irvine, CA, USA.

Nature Communications
|August 19, 2024
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Summary
This summary is machine-generated.

Urban form significantly impacts flood risk. This study develops a theory linking urban complexity, like building arrangements and porosity, to flood depth, offering a global model for urban flood hazards.

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Area of Science:

  • Urban Hydrology
  • Statistical Mechanics
  • Geophysics

Background:

  • Urbanization and climate change exacerbate global flooding.
  • Existing flood resilience strategies focus on structures, overlooking urban form's role.
  • Understanding urban form's influence on flood concentration is crucial.

Purpose of the Study:

  • To investigate the relationship between urban form complexity and flood hazard concentration.
  • To develop a theoretical framework for quantifying flood risk based on urban characteristics.
  • To create a globally applicable analytical model for neighborhood-scale flood hazards.

Main Methods:

  • Application of statistical mechanics to model urban flooding.
  • Development of a mean-flow theory relating flood hazards to urban form parameters (ground slope, porosity, Mermin order parameter).
  • Introduction of an effective mean chord length for universal scaling of flood depth.

Main Results:

  • Flood depth scales linearly with urban porosity and order parameter, varying with urban layout symmetry.
  • A universal scaling law for flood hazards is derived using an effective mean chord length.
  • The model successfully links urban form and rainfall extremes to recorded flood losses across cities.

Conclusions:

  • Urban form is a critical determinant of flood hazard intensity.
  • The developed mean-flow theory provides a novel analytical tool for assessing urban flood risk globally.
  • This research offers insights for designing more flood-resilient urban environments.