CSDMS - User contributions [en]

2024 CSDMS meeting-058

2024-02-26T13:49:09Z

Houssais:

{{CSDMS meeting personal information template-2024
|CSDMS meeting first name=Morgane
|CSDMS meeting last name=Houssais
|CSDMS Pronouns=She/Her
|CSDMS meeting institute=Physics, Clark University
|CSDMS meeting city=Worcester
|CSDMS meeting country=United States
|CSDMS meeting state=Massachusetts
|CSDMS meeting email address=mhoussais@clarku.edu
}}
{{CSDMS meeting select clinics1 2024
|CSDMS_meeting_select_clinics1_2024=2) Vegetation as ecogeomorphic features
}}
{{CSDMS meeting select clinics2 2024
|CSDMS_meeting_select_clinics2_2024=3) Parameterizing human dynamics in geomorphic models: learning from coastal barrier evolution models
}}
{{CSDMS meeting select clinics3 2024
|CSDMS_meeting_select_clinics3_2024=3) New features and basic usage of the GeoClaw software for depth-averaged flow
}}
{{CSDMS meeting abstract yes no 2024
|CSDMS meeting abstract submit 2024=Yes
}}
{{CSDMS meeting abstract poster Epub 2024
|CSDMS meeting poster Epub submit 2024=Poster
}}
{{CSDMS meeting abstract title temp2024
|CSDMS meeting abstract title=Using a new fundamental equation of sediment creep to model coastal breaching and landsliding
|Working_group_member_WG_FRG=Terrestrial Working Group, Coastal Working Group, Hydrology Focus Research Group, Critical Zone Focus Research Group, Ecosystem Dynamics Focus Research Group
}}
{{CSDMS meeting authors template
|CSDMS meeting coauthor first name abstract=Mara
|CSDMS meeting coauthor last name abstract=Orescanin
|CSDMS meeting coauthor institute / Organization=Naval Postgraduate School
|CSDMS meeting coauthor town-city=Monterey
|CSDMS meeting coauthor country=United States
|State=California
}}
{{CSDMS meeting authors template
|CSDMS meeting coauthor first name abstract=David
|CSDMS meeting coauthor last name abstract=Litwin
|CSDMS meeting coauthor institute / Organization=GeoForschungsZentrum
|CSDMS meeting coauthor town-city=Potsdam
|CSDMS meeting coauthor country=Germany
}}
{{CSDMS meeting authors template
|CSDMS meeting coauthor first name abstract=Olivier
|CSDMS meeting coauthor last name abstract=Devauchelle
|CSDMS meeting coauthor institute / Organization=Institut de Physique du Globe de Paris
|CSDMS meeting coauthor town-city=Paris
|CSDMS meeting coauthor country=France
}}
{{CSDMS meeting abstract template 2024
|CSDMS meeting abstract=Sediment creep is ubiquitous and precedes failure (e.g. landslides) in most landscapes. Accurate modeling of sediment creep is therefore crucial for predicting both the long-term (>10 000 years) evolution of landscapes and the short-term (minute to centuries) evolution of landscapes and infrastructures. Current sediment creep transport laws used in landscape modeling are determined empirically over geological time scales and are diffusion-like [Roering et al,2001]; yet the mechanics of sediment creep on all time scales remain poorly understood. As a result, creep models used in civil engineering, materials science, and geomorphology are largely disconnected in time scales, goals, and approaches. In particular, excess porous flow from rain infiltration is currently not a governing parameter of any creep model, while large rain events are known to trigger landscape failures.
Houssais et al. [2021] showed experimentally for the first time, that porous flow can be a leading cause of creep, and ultimately the failure (avalanching) of sediment piles, for flow strength (or pore pressure) far lower than classically admitted. Building on the results from Houssais et al., we propose a new equation for sediment creep consistent with the general formalism of the mechanical creep of disordered materials. In our equation, the creep sediment flux is a function of: topographic slope (similar to the equation from Roering et al.), porous flow intensity, grains and fluid properties, and, importantly, time.

We present here the first results of landscape dynamics from the implementation of our new sediment creep function in landlab, for the case of idealized berms (or coastal natural dams), before they breach. The long-term goal of this effort is to compare the model to our topographic and hydrogeologic observations of berms (pre-)breaching on the coast of Monterey County, CA, that occur each winter, as large rain episodes hit the land. This specific case is a good way to test our model validity over time scales from 1 minute to 1 month. In our presentation, we will show preliminary results of the berms creep (pre-breaching) dynamics, using over-simplified equations for the groundwater flow. In the future, we intend to develop a Landlab component of our new creep function, which could be used with Groundwaterdupuitpercolator, a landlab component recently developed to model groundwater flow while modeling landscape dynamics [Litwin et al., 2020, 2022].
In the end, once this model is validated, it will allow us to model sediment creep at all time and rate scales, and better predict chances of, and monitor, sedimentary failures, such as breaching and landslides. Our new model for sediment creep fundamentally addresses our needs for better understanding and forecasting landscape response to changing climate patterns.

Houssais, M., C. Maldarelli, and J. F. Morris, “Athermal sediment creep triggered by porous flow,” Physical Review Fluids, vol. 6, no. 1, p. L012301, 2021.

Litwin, D. G., G. E. Tucker, K. R. Barnhart, and C. J. Harman, “Groundwaterdupuitpercolator: A landlab component for groundwater flow,” Journal of Open Source Software, vol. 5, no. 46, p. 1935, 2020.

Litwin, D. G., G. E. Tucker, K. R. Barnhart, and C. J. Harman, “Groundwater affects the geomorphic and hydrologic properties of coevolved landscapes,” Journal of Geophysical Research: Earth Surface, vol. 127, no. 1, p. e2021JF006239, 2022.

Roering, J. J., J. W. Kirchner, L. S. Sklar, and W. E. Dietrich, “Hillslope evolution by nonlinear creep and landsliding: An experimental study,” Geology, vol.
}}
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2024 CSDMS meeting-058

2024-02-26T13:33:56Z

Houssais: Created page with "{{CSDMS meeting personal information template-2024 |CSDMS meeting first name=Morgane |CSDMS meeting last name=Houssais |CSDMS Pronouns=She/Her |CSDMS meeting institute=Clark University |CSDMS meeting city=Worcester |CSDMS meeting country=United States |CSDMS meeting state=Massachusetts |CSDMS meeting email address=mhoussais@clarku.edu }} {{CSDMS meeting select clinics1 2024 |CSDMS_meeting_select_clinics1_2024=2) Vegetation as ecogeomorphic features }} {{CSDMS meeting sel..."

{{CSDMS meeting personal information template-2024
|CSDMS meeting first name=Morgane
|CSDMS meeting last name=Houssais
|CSDMS Pronouns=She/Her
|CSDMS meeting institute=Clark University
|CSDMS meeting city=Worcester
|CSDMS meeting country=United States
|CSDMS meeting state=Massachusetts
|CSDMS meeting email address=mhoussais@clarku.edu
}}
{{CSDMS meeting select clinics1 2024
|CSDMS_meeting_select_clinics1_2024=2) Vegetation as ecogeomorphic features
}}
{{CSDMS meeting select clinics2 2024
|CSDMS_meeting_select_clinics2_2024=3) Parameterizing human dynamics in geomorphic models: learning from coastal barrier evolution models
}}
{{CSDMS meeting select clinics3 2024
|CSDMS_meeting_select_clinics3_2024=3) New features and basic usage of the GeoClaw software for depth-averaged flow
}}
{{CSDMS meeting abstract yes no 2024
|CSDMS meeting abstract submit 2024=Yes
}}
{{CSDMS meeting abstract poster Epub 2024
|CSDMS meeting poster Epub submit 2024=Poster
}}
{{CSDMS meeting abstract title temp2024
|CSDMS meeting abstract title=Using a new fundamental equation of sediment creep to model coastal breaching and landsliding
|Working_group_member_WG_FRG=Terrestrial Working Group, Coastal Working Group, Hydrology Focus Research Group, Critical Zone Focus Research Group, Ecosystem Dynamics Focus Research Group
}}
{{CSDMS meeting authors template
|CSDMS meeting coauthor first name abstract=Mara
|CSDMS meeting coauthor last name abstract=Orescanin
|CSDMS meeting coauthor institute / Organization=Naval Postgraduate School
|CSDMS meeting coauthor town-city=Monterey
|CSDMS meeting coauthor country=United States
|State=California
}}
{{CSDMS meeting authors template
|CSDMS meeting coauthor first name abstract=David
|CSDMS meeting coauthor last name abstract=Litwin
|CSDMS meeting coauthor institute / Organization=GeoForschungsZentrum
|CSDMS meeting coauthor town-city=Potsdam
|CSDMS meeting coauthor country=Germany
}}
{{CSDMS meeting authors template
|CSDMS meeting coauthor first name abstract=Olivier
|CSDMS meeting coauthor last name abstract=Devauchelle
|CSDMS meeting coauthor institute / Organization=Institut de Physique du Globe de Paris
|CSDMS meeting coauthor town-city=Paris
|CSDMS meeting coauthor country=France
}}
{{CSDMS meeting abstract template 2024
|CSDMS meeting abstract=Sediment creep is ubiquitous and precedes failure (e.g. landslides) in most landscapes. Accurate modeling of sediment creep is therefore crucial for predicting both the long-term (>10 000 years) evolution of landscapes and the short-term (minute to centuries) evolution of landscapes and infrastructures. Current sediment creep transport laws used in landscape modeling are determined empirically over geological time scales and are diffusion-like [Roering et al,2001]; yet the mechanics of sediment creep on all time scales remain poorly understood. As a result, creep models used in civil engineering, materials science, and geomorphology are largely disconnected in time scales, goals, and approaches. In particular, excess porous flow from rain infiltration is currently not a governing parameter of any creep model, while large rain events are known to trigger landscape failures.
Houssais et al. [2021] showed experimentally for the first time, that porous flow can be a leading cause of creep, and ultimately the failure (avalanching) of sediment piles, for flow strength (or pore pressure) far lower than classically admitted. Building on the results from Houssais et al., we propose a new equation for sediment creep consistent with the general formalism of the mechanical creep of disordered materials. In our equation, the creep sediment flux is a function of: topographic slope (similar to the equation from Roering et al.), porous flow intensity, grains and fluid properties, and, importantly, time.

We present here the first results of landscape dynamics from the implementation of our new sediment creep function in landlab, for the case of idealized berms (or coastal natural dams), before they breach. The long-term goal of this effort is to compare the model to our topographic and hydrogeologic observations of berms (pre-)breaching on the coast of Monterey County, CA, that occur each winter, as large rain episodes hit the land. This specific case is a good way to test our model validity over time scales from 1 minute to 1 month. In our presentation, we will show preliminary results of the berms creep (pre-breaching) dynamics, using over-simplified equations for the groundwater flow. In the future, we intend to develop a Landlab component of our new creep function, which could be used with Groundwaterdupuitpercolator, a landlab component recently developed to model groundwater flow while modeling landscape dynamics [Litwin et al., 2020, 2022].
In the end, once this model is validated, it will allow us to model sediment creep at all time and rate scales, and better predict chances of, and monitor, sedimentary failures, such as breaching and landslides. Our new model for sediment creep fundamentally addresses our needs for better understanding and forecasting landscape response to changing climate patterns.

Houssais, M., C. Maldarelli, and J. F. Morris, “Athermal sediment creep triggered by porous flow,” Physical Review Fluids, vol. 6, no. 1, p. L012301, 2021.

Litwin, D. G., G. E. Tucker, K. R. Barnhart, and C. J. Harman, “Groundwaterdupuitpercolator: A landlab component for groundwater flow,” Journal of Open Source Software, vol. 5, no. 46, p. 1935, 2020.

Litwin, D. G., G. E. Tucker, K. R. Barnhart, and C. J. Harman, “Groundwater affects the geomorphic and hydrologic properties of coevolved landscapes,” Journal of Geophysical Research: Earth Surface, vol. 127, no. 1, p. e2021JF006239, 2022.

Roering, J. J., J. W. Kirchner, L. S. Sklar, and W. E. Dietrich, “Hillslope evolution by nonlinear creep and landsliding: An experimental study,” Geology, vol.
}}
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Annualmeeting:2017 CSDMS meeting-115

2017-03-28T22:24:46Z

Houssais: Created page with "{{CSDMS meeting personal information template-2014 |CSDMS meeting first name=Morgane |CSDMS meeting last name=Houssais |CSDMS meeting institute=Levich Institute - City College..."

{{CSDMS meeting personal information template-2014
|CSDMS meeting first name=Morgane
|CSDMS meeting last name=Houssais
|CSDMS meeting institute=Levich Institute - City College of New York
|CSDMS meeting city=New York
|CSDMS meeting country=United States
|CSDMS meeting state=New York
|CSDMS meeting email address=houssais.morgane@gmail.com
}}
{{CSDMS meeting scholar and pre-meeting
|CSDMS meeting pre-conference=None
|CSDMS meeting post-conference=No
}}
{{CSDMS meeting select clinics1
|CSDMS_meeting_select_clinics1=2) ANUGA - river flood morphodynamics
}}
{{CSDMS meeting select clinics2
|CSDMS_meeting_select_clinics2=4) The Sediment Experimentalist Network (SEN)
}}
{{CSDMS meeting select clinics3
|CSDMS_meeting_select_clinics3=1) Parflow groundwater modeling
}}
{{CSDMS scholarships yes no
|CSDMS meeting scholarships=No
}}
{{CSDMS meeting abstract yes no
|CSDMS meeting abstract submit=Yes
}}
{{CSDMS meeting abstract title temp
|CSDMS meeting abstract title=Experimental investigation of soil creep under porous flow condition
}}
{{CSDMS meeting abstract template
|CSDMS meeting abstract=Sediment transport modeling is challenging in all systems and flow regimes. Rivers, soils, and sea margins share a common feature: as their boundaries are mobile and constantly adapting, they tend to always be near the threshold of entrainment.
This difficulty becomes dramatic for steep soils, only doing very slow granular creep, but whose ultimately, under statistically rare conditions, can turn into a landslide, a very fast avalanche flow [Houssais and Jerolmack, 2017].
The abrupt transition from soil creep to avalanching remains mostly non-understood. Yet, capturing its dynamics -- being able to predict a regional statistics for landslide depending on topographic, tectonic and climatic conditions -- would allow for much more accurate landscape evolution modeling.
We present here preliminary results of an experimental investigation of one the major triggering condition for soils destabilization: rain infiltration, and more generally porous flow through a tilted granular bed. In a quasi-2D microfluidics channel, a flat sediment bed made of spherical particles is prepared, in fully submerged condition. It is thereafter tilted (at slope under critical slope of avalanching) and simultaneously put under vertical weak porous flow (well under the critical flow of liquefaction regarding positive pressure gradients).
The 2 control parameters are varied, and local particles concentration and motion are measured. Interestingly, although staying in the sub-critical creeping regime, we observe an acceleration of the bed deformation downward, as the porous flow and the bed slope are increased, until the criteria for avalanching is reached. Those results appear to present similitudes with the case of tilted dry sediment bed under controlled vibrations. Consequently it opens the discussion about a potential universal model of landslides triggering due to frequent seismological and rainstorm events.
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