Submarine Landslides and their impacts on Offshore Infrastructures

Informazioni relative al progetto

SUBSLIDE

ID dell’accordo di sovvenzione: 101022007

DOI

10.3030/101022007

Progetto chiuso

Data della firma CE 30 Aprile 2021

Data di avvio 1 Giugno 2021

Data di completamento 31 Maggio 2023

Finanziato da

• EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions

Costo totale

€ 214 158,72

Contributo UE

€ 214 158,72

Coordinato da

NORGES TEKNISK-NATURVITENSKAPELIGE UNIVERSITET NTNU
Norway

Periodic Reporting for period 1 - SUBSLIDE (Submarine Landslides and their impacts on Offshore Infrastructures)

Periodo di rendicontazione: 2021-06-01 al 2023-05-31

Sintesi del contesto e degli obiettivi generali del progetto

The overall research objective of SUBSLIDE is to develop a novel numerical tool capable of (a) simulating all stages of submarine landslides to understand the full mechanisms and (b) quantifying the impact forces of submarine landslides on offshore structures. Therefore, SUBSLIDE sets out four specific research objectives (ROs) and one training objective (TO) as follows:

RO1: Develop a fully coupled soil-fluid-structure MPM model capable of analysing pore water pressure development, landslide-induced waves, and the impact forces of submarine landslides.
RO2: Develop a critical-state soil model capable of reproducing the mechanical responses of the sediments as measured in laboratory.
RO3: Quantify trigger mechanisms (e.g. magnitude of earthquakes) of a submarine landslide and their influences on post-failure characteristics.
RO4: Quantify impact forces of potential submarine slides on anchors and mooring systems in Bjørnafjorden.
TO: Maximize my career prospects by developing multidisciplinary research skills in landslide hazard assessment along with complementary skills including grant writing, mentoring, and dissemination.

Lavoro eseguito dall’inizio del progetto fino alla fine del periodo coperto dalla relazione e principali risultati finora ottenuti

Submarine landslides are complicated because they involve a transition from a solid to a liquid phase during debris flow. Engineers currently use two different methods to assess the hazard of submarine landslides. First, they use finite element analysis to evaluate the marine slope. If the slope has high risk of failure, they then use CFD to predict the consequences of the debris flow. Our CFD-MPM model can do both in a single simulation. Moreover, it can provide insights into the triggering mechanism, the evolution of water pressure, temperature, and how marine sediments, seawater, and offshore structures interact with each other. These features have potential to improve risk assessment and mitigation strategies for submarine landslides.

Progressi oltre lo stato dell’arte e potenziale impatto previsto (incluso l’impatto socioeconomico e le implicazioni sociali più ampie del progetto fino ad ora)

Open-source codes developed in SUBLIDE have been maintained and manuals on GitHub open-source platform under an MIT license to maximise reproducibility and to eliminate any Intellectual Property Right barriers to industrial uptake of the results. Also, the numerical code was education tools leading to PhD and MSc theses through graduate supervisions. 2 Master thesis and 2 PhD students took direct benefits from using the code. The scientific findings have been used as preliminary results for other research proposals.

three phases of the numerical model