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An Integrated Methodology for Assessing Cyclone-Induced Turbidity Currents in a Low-Supply Submarine Canyon System
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, NSG 2025: 1st Conference on Geohazards Assessment and Risk Mitigation Conference, Sep 2025, Volume 2025, p.1 - 5
Abstract
Summary
Submarine canyons are key pathways for transferring sediments, and associated geohazards, to the deep sea, yet the initiation and evolution of cyclone‐induced turbidity currents remain poorly constrained, especially in macro‐tidal, low‐supply settings. A submarine canyon, which conveys sediment from a macro-tidal bay into a basin, exemplifies this challenge. We introduce an integrated methodology that synthesizes seabed geotechnical data, a 10’000-year probabilistic cyclone-metocean analysis, high-resolution nearshore hydrodynamic and sediment-transport modeling, a densimetric-Froude hyperpycnal‐plunging criterion, and nested 3D high-resolution turbidity-current simulations. Applied to extreme cyclones (103–104 yr return period), our approach reveals threshold conditions for underflow initiation, flow dynamics and morphodynamic impacts, offering a robust framework for offshore geohazard assessment and infrastructure protection.
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