Evaluation of the submarine debris-flow hazard risks to planned subsea pipeline systems: a case study in the Qiongdongnan Basin, South China Sea

Huang，Mingquan1,2,4; Qian，Xuesheng2,3; Xu，Jingping2,3; Li，Xuecheng4

2023-05-01

10.1007/s13131-022-2123-0

Acta Oceanologica Sinica   Impact Factor & Quartile

0253-505X

1869-1099

The ever-increasing deepwater oil and gas development in the Qiongdongnan Basin, South China Sea has initiated the need to evaluate submarine debris-flow hazard risks to seafloor infrastructures. This paper presents a case study on evaluating the debris-flow hazard risks to the planned pipeline systems in this region. We used a numerical model to perform simulations to support this quantitative evaluation. First, one relict failure interpreted across the development site was simulated. The back-analysis modeling was used to validate the applicability of the rheological parameters. Then, this model was applied to forecast the runout behaviors of future debris flows originating from the unstable upslope regions considered to be the most critical to the pipeline systems surrounding the Manifolds A and B. The model results showed that the potential debris-flow hazard risks rely on the location of structures and the selection of rheological parameters. For the Manifold B and connected pipeline systems, because of their remote distances away from unstable canyon flanks, the potential debris flows impose few risks. However, the pipeline systems around the Manifold A are exposed to significant hazard risks from future debris flows with selected rheological parameters. These results are beneficial for the design of a more resilient pipeline route in consideration of future debris-flow hazard risks.

hazard evaluation manifold pipeline Qiongdongnan Basin route optimization submarine debris flow

SCI

English

Corresponding

National Natural Science Foundation of China["42106198","41720104001"] ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0210]

Oceanography

Oceanography

WOS:001031318600012

SPRINGER

GEOSCIENCES

2-s2.0-85165269140

Scopus

1.School of Environment,Harbin Institute of Technology,Harbin,150001,China
2.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou,511458,China
4.China Offshore Fugro Geosolutions (Shenzhen) Corporation Limited,Shenzhen,518067,China

Huang，Mingquan,Qian，Xuesheng,Xu，Jingping,et al. Evaluation of the submarine debris-flow hazard risks to planned subsea pipeline systems: a case study in the Qiongdongnan Basin, South China Sea[J]. Acta Oceanologica Sinica,2023,42(5):139-153.

Huang，Mingquan,Qian，Xuesheng,Xu，Jingping,&Li，Xuecheng.(2023).Evaluation of the submarine debris-flow hazard risks to planned subsea pipeline systems: a case study in the Qiongdongnan Basin, South China Sea.Acta Oceanologica Sinica,42(5),139-153.

Huang，Mingquan,et al."Evaluation of the submarine debris-flow hazard risks to planned subsea pipeline systems: a case study in the Qiongdongnan Basin, South China Sea".Acta Oceanologica Sinica 42.5(2023):139-153.