Variable hydrograph inputs for a numerical debris-flow runout model
-
Published:2022-05-17
Issue:5
Volume:22
Page:1627-1654
-
ISSN:1684-9981
-
Container-title:Natural Hazards and Earth System Sciences
-
language:en
-
Short-container-title:Nat. Hazards Earth Syst. Sci.
Author:
Mitchell AndrewORCID, Zubrycky Sophia, McDougall Scott, Aaron Jordan, Jacquemart MylèneORCID, Hübl JohannesORCID, Kaitna RolandORCID, Graf Christoph
Abstract
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 that 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 that variation in
inflow conditions can lead to reasonable estimates of the potential variation in impacts.
Funder
Natural Sciences and Engineering Research Council of Canada
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences
Reference45 articles.
1. Aaron, J., Stark, T. D., and Baghdady, A. K.: Closure to “Oso, Washington,
Landslide of March 22, 2014: Dynamic Analysis” by Jordan Aaron, Oldrich Hungr, Timothy D. Stark, and Ahmed, K. Baghdady, J. Geotech. Geoenviron., 144, 07018023, https://doi.org/10.1061/(ASCE)GT.1943-5606.0001748, 2018. 2. Arai, M., Hübl, J., and Kaitna, R.: Occurrence conditions of roll waves
for three grain-fluid models and comparison with results from experiments
and field observations, Geophys. J. Int., 195, 1464–1480, https://doi.org/10.1093/gji/ggt352, 2013. 3. Bennett, G. L., Molnar, P. McArdell, B. W., and Burlando, P.: A probabilistic
sediment cascade model of sediment transfer in the Illgraben, Water Resour.
Res., 50, 1225–1244, https://doi.org/10.1002/2013WR013806, 2014. 4. Berti, M., Bernard, M., Gregoretti, C., and Simoni, A.: Physical interpretation of rainfall thresholds for runoff-generated debris flows, J. Geophys. Res.-Earth, 125, e2019JF005513, https://doi.org/10.1029/2019JF005513, 2020. 5. Bovis, M. J. and Jakob, M.: The role of debris supply conditions in predicting debris flow activity, Earth Surf. Proc. Land., 24, 1039–1054,
https://doi.org/10.1002/(SICI)1096-9837(199910)24:11<1039::AID-ESP29>3.0.CO;2-U, 1999.
Cited by
7 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|