Functional Design of Mitigation Measures: From Design Event Definition to Targeted Process Modifications

Piton, Guillaume; D’Agostino, Vincenzo; Horiguchi, Toshiyuki; Ikeda, Akihiko; Hübl, Johannes

doi:10.1007/978-3-031-48691-3_15

Advances in Debris-Flow Science and Practice 2024

DOI: 10.1007/978-3-031-48691-3_15

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Functional Design of Mitigation Measures: From Design Event Definition to Targeted Process Modifications

Guillaume Piton,

Vincenzo D’Agostino,

Toshiyuki Horiguchi

et al.

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2024

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An alternative approach for the sediment control of in-channel stony debris flows with an application to the case study of Ru Secco Creek (Venetian Dolomites, Northeast Italy)

Barbini,

Bernard,

Boreggio

et al. 2024

Front. Earth Sci.

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Controlling sediment to reduce debris-flow hazard is generally approached using retention basins that can be closed or have an outlet structure, generally an open check dam. They are usually placed in mild slope zones that allow minimal works for the excavation and the foundation of the outlet structure if present. Recently, it has been shown that the detention of sediments can also be achieved in the high-sloping reaches of debris-flow channels using deposition areas, basins that are open on the downstream side. In this work, we propose an approach for controlling the sediment volume transported by debris flows consisting of a cascade of deposition areas and retention basins. We also include a framework for planning, sizing, and checking the works. Two scenarios are considered, corresponding to the maximum values of the debris-flow peak discharge and volume, respectively. Moreover, the presence or absence of boulders is also considered. For this purpose, a method that evaluates the clogging of a single open check dam as a function of the coarse fraction of the sediment volume is simply extended to the case of multiple dams and implemented in a routing model. The proposed approach is applied along Ru Secco Creek in northeast Italy to defend a resort area and a village hit by a high-magnitude debris flow in 2015. After a careful survey and study, a solution with a combination of deposition areas and retention basins is planned and sized. The validity and performance of the proposed solution are analyzed using debris-flow modeling for two scenarios, considering both the absence and presence of boulders. Most of the sediment volume transported by debris flows is trapped, and a small solid discharge flows downstream of the works.

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An alternative approach for the sediment control of in-channel stony debris flows with an application to the case study of Ru Secco Creek (Venetian Dolomites, Northeast Italy)

Barbini,

Bernard,

Boreggio

et al. 2024

Front. Earth Sci.

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Functional Design of Mitigation Measures: From Design Event Definition to Targeted Process Modifications

Cited by 1 publication

References 127 publications

An alternative approach for the sediment control of in-channel stony debris flows with an application to the case study of Ru Secco Creek (Venetian Dolomites, Northeast Italy)

An alternative approach for the sediment control of in-channel stony debris flows with an application to the case study of Ru Secco Creek (Venetian Dolomites, Northeast Italy)

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