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Updated: Jun 5, 2025

Simulating Impacts of Ice Storms on Forest Ecosystems
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Forest dynamics where typhoon winds blow.

Aland H Y Chan1, Toby D Jackson1, Ying Ki Law2

  • 1Conservation Research Institute and Department of Plant Sciences, University of Cambridge, Downing St., Cambridge, CB2 3EA, UK.

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|December 14, 2024
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Summary
This summary is machine-generated.

Tropical cyclones (TCs) significantly impact forest structure, especially in mountains. TCs limit forest height more than topography, with wind-sheltered areas showing more damage than expected.

Keywords:
LiDARplantationrainforestresiliencetopographytropical cyclonetyphoonwind modelling

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Area of Science:

  • Ecology
  • Forestry
  • Meteorology

Background:

  • Tropical cyclones (TCs) cause significant forest damage, but their impact on mountainous terrain remains poorly understood due to modeling complexities.
  • Typhoon Mangkhut (2018) provided a unique opportunity to study TC effects with extensive data from Hong Kong.

Purpose of the Study:

  • To investigate the effects of extreme wind events from TCs on forest structure and dynamics in mountainous regions.
  • To compare the impact of TCs on natural rainforests versus plantations.

Main Methods:

  • Utilized a dense anemometer network and repeated LiDAR surveys to capture forest changes.
  • Employed Computational Fluid Dynamics (CFD) models to map wind speeds and analyze canopy height alterations across a large area (>400,000 pixels, 1108 km²).

Main Results:

  • Forest height was more constrained by wind exposure than topography, indicating a balance between growth and TC-induced damage.
  • Wind-sheltered forests experienced significant damage, resulting in more rugged canopies compared to exposed forests.
  • Plantations showed greater susceptibility to TC damage than natural rainforests, with greater canopy height reduction.

Conclusions:

  • TCs are a critical, often underestimated, factor shaping forest structure and dynamics, particularly in exposed and mountainous environments.
  • Forest management strategies should consider the differential vulnerability of natural forests and plantations to extreme wind events.