Integration of two-phase solid fluid equations in a catchment model for flashfloods, debris flows and shallow slope failures
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
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AbstractAn integrated, modeling method for shallow landslides, debris flows and catchment hydrology is developed and presented in this paper. Existing two-phase debris flow equations and an adaptation on the infinite slope method are coupled with a full hydrological catchment model. We test the approach on the 4 km2 Scaletta catchment, North-Eastern Sicily, where the 1-10-2009 convective storm caused debris flooding after 395 shallow landslides. Validation is done based on the landslide inventory and photographic evidence from the days after the event. Results show that the model can recreate the impact of both shallow landslides, debris flow runout, and debris floods with acceptable accuracy (91 percent inventory overlap with a 0.22 Cohens Kappa). General patterns in slope failure and runout are well-predicted, leading to a fully physically based prediction of rainfall induced debris flood behavior in the downstream areas, such as the creation of a debris fan at the coastal outlet.
CitationBout B, Lombardo L, van Westen CJ, Jetten VG (2018) Integration of two-phase solid fluid equations in a catchment model for flashfloods, debris flows and shallow slope failures. Environmental Modelling & Software 105: 1–16. Available: http://dx.doi.org/10.1016/j.envsoft.2018.03.017.
SponsorsWe wish to express our gratitude to the editorial team of the journal and the reviewers for the thorough efforts to help improve this research. The presented work is part of the Earth System Analysis group, ITC, Twente University, the Netherlands in corporation with Computational Earthquake Seismology and Extreme Statistic groups, King Abdullah University of Science and Technology. Satellite images were provided by the European Space Agency through the project titled: “A remote sensing based approach for storm triggered debris flow hazard modeling: application in Mediterranean and tropical Pacific areas”, code: C1P.14151, PI: Luigi Lombardo, ID: 14151. Funded by the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Open Fund SKLGP2018K001.