Debris flows recorded in the Moscardo catchment (Italian Alps) between 1990 and 2019

Marchi, Lorenzo; Cazorzi, Federico; Arattano, M.; Cucchiaro, Sara; Cavalli, Marco; Crema, Stefano

doi:10.5194/nhess-21-87-2021

Cited by 33 publications

(14 citation statements)

References 19 publications

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“…With the volume and peak discharge, one can calculate the total inflow duration, but the time to peak must be selected. A 170 recent study of debris flows in the Moscardo catchment in Italy from 2002 to 2019 showed a typical surge duration to be approximately six times the time from debris-flow initiation to the peak discharge (Marchi et al, 2021). In this study, the time https://doi.org/10.5194/nhess-2021-352 Preprint.…”

Section: Triangular Inflow Hydrographs 160mentioning

confidence: 63%

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Variable hydrograph inputs for a numerical debris-flow runout model

Mitchell

Zubrycky

McDougall

et al. 2021

Preprint

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Abstract. Debris flows affect people and infrastructure around the world, and as a result, many numerical models and modelling approaches have been developed to simulate their impacts. Observations from instrumented debris-flow channels show that variability in inflow depth, velocity and discharge in real debris flows is much higher than what is typically used in numerical simulations. However, the effect of this natural variability on numerical model outputs is not well known. In this study, we examine the effects of using complex inflow time series within a single-phase runout model utilizing a Voellmy flow-resistance model. The interactions between model topography and flow-resistance were studied first using a simple triangular hydrograph, which showed simulated discharges change because of local slopes and Voellmy parameters. Next, more complex inflows were tested using time series based on 24 real debris-flow hydrographs initiated from three locations. We described a simple method to scale inflow hydrographs by defining a target event volume and maximum allowable peak discharge. The results showed a large variation in simulated flow depths and velocities arising from the variable inflow. The effects of variable inflow conditions were demonstrated in simulations of two case histories of real debris flows, where the variation in inflow leads to significant variations in the simulation outputs. The real debris-flow hydrographs were used to provide an indication of the range of impacts that may result from the natural variability in inflow conditions. These results demonstrate variation in inflow conditions can lead to reasonable estimates of the potential variation in impacts.

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Section: Triangular Inflow Hydrographs 160mentioning

confidence: 63%

“…to peak for the triangular hydrographs is taken as 20% of the total inflow duration, similar to the general shape found by Marchi et al (2021) and Hübl and Kaitna (2021).…”

Section: Triangular Inflow Hydrographs 160mentioning

confidence: 99%

Variable hydrograph inputs for a numerical debris-flow runout model

Mitchell

Zubrycky

McDougall

et al. 2021

Preprint

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“…The IC profile analysis improves the interpretation of a spatially mapped index along the selected channel by adding information about sediment budgeting. In this specific case, the sediment budgeting refers to a quite extended period (ten years), but it is not seen as a limitation since hazard management also accounts for long terms geomorphic evolution to plan the proper mitigation strategies (de Haas et al 2018;Marchi et al 2021).…”

Section: Connectivity Index Analysis and Prediction Capability In A G...mentioning

confidence: 99%

Morphodynamics and sediment connectivity index in an unmanaged, debris-flow prone catchment: a through time perspective

2023

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Torrential processes are among the main actors responsible for sediment production and mobility in mountain catchments. For this reason, the understanding of preferential pathways for sediment routing has become a priority in hazard assessment and mitigation. In this context, the sediment Connectivity Index (IC) enables to analyse the existing linkage between sediment sources and the selected target (channel network or catchment outlet). The IC is a grid-based index that allows fast computation of sediment connectivity based on landscape information derived from a single Digital Terrain Model (DTM). The index computation is based on the log-ratio between an upslope and a downslope component, including information about drainage area, slope, terrain roughness, and distance to the analysis target (e.g. outlet). The output is a map that highlights the degree of structural connectivity of sediment pathways over analysed catchments. Until now, these maps are however rarely used to help defining debris-flow hazard maps, notably due to a lack of guidelines to interpret the IC spatial distribution. This paper proposes an exploitation procedure along profiles to extract more information from the analysis of mapped IC values. The methodology relies on the analysis of the IC and its component variables along the main channel profile, integrated with information about sediment budgeting derived from Difference of DEMs (DoD). The study of connectivity was applied in the unmanaged sub-catchment (without torrent control works) of the Rio Soial (Autonomous Province of Trento – NE Italy) to understanding the geomorphic evolution of the area after five debris flows (in ten years) and the related changes of sediment connectivity. Using a recent DTM as validation, we demonstrated how an IC analysis over the older DTM can help predicting geomorphic changes and associated hazards. The results show an IC aptitude to capture geomorphic trajectories, anticipate debris flow deposits in a specific channel location, and depict preferential routing pathways..

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“…In a potential area, the debris flows usually occur in a low frequency and are considered as uncommon events when comparing to other natural hazards, e.g., the heavy rainfalls. But at some locations, the occurrence frequency of debris flow is higher than other locations (Marchi et al, 2021). The Shenmu area in Taiwan is the one where debris flows had occurred more often than other locations, and almost once every year in the past 18 years.Given the environmental conditions at the mountain areas in Taiwan, it is more desired to deploy the monitoring instrumentation at the potentially streams, especially at the upper sections of them.…”

mentioning

confidence: 93%

“…The studies about debris-flow characteristics started from Japan and China (Marchi et al, 2021). A review by Hürlimann et al (2019) has addressed the collected information from nine monitoring sties and discussed the achievements and the types of monitoring systems.…”

mentioning

confidence: 99%

Characteristics of debris flows recorded in the Shenmu area of central Taiwan between 2004 and 2021

Huang

2023

Preprint

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Abstract. The data of debris-flow events between 2004 and 2001 in the Shebmu area Taiwan were presented and discussed in this paper. Total of 20 debris flows were observed in this time interval. The monitored data include rainfall, flow velocity, soil moisture, and ground surface vibrations. Debris flows in the Shenmu area usually occurred in the Aiyuzi Stream during the rainy season, May to September, and about once per year after 2009. The measured rainfalls from separate monitoring stations were compared and the rainfall thresholds of the Shenmu area were analysed using the rainfall intensity (I), the accumulated rainfall (R), and durations (D). The dataset and the rainfall thresholds of the Shenmu area permits the comparison with other monitored catchments.

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Debris flows recorded in the Moscardo catchment (Italian Alps) between 1990 and 2019

Cited by 33 publications

References 19 publications

Variable hydrograph inputs for a numerical debris-flow runout model

Variable hydrograph inputs for a numerical debris-flow runout model

Morphodynamics and sediment connectivity index in an unmanaged, debris-flow prone catchment: a through time perspective

Characteristics of debris flows recorded in the Shenmu area of central Taiwan between 2004 and 2021

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