CSDMS - User contributions [en]

2026 CSDMS meeting-050

2026-03-25T18:00:08Z

Sfgallen: Created page with "{{CSDMS meeting personal information template-2026 |CSDMS meeting first name=Sean |CSDMS meeting last name=Gallen |CSDMS Pronouns=he/him |CSDMS meeting institute=Colorado State University |CSDMS meeting city=Fort Collins |CSDMS meeting country=United States |CSDMS meeting state=Colorado |CSDMS meeting email address=sean.gallen@colostate.edu |CSDMS meeting phone=3157297939 }} {{CSDMS meeting select clinics1 2026 |CSDMS_meeting_select_clinics1_2026=4) The Art of Modeling:..."

{{CSDMS meeting personal information template-2026
|CSDMS meeting first name=Sean
|CSDMS meeting last name=Gallen
|CSDMS Pronouns=he/him
|CSDMS meeting institute=Colorado State University
|CSDMS meeting city=Fort Collins
|CSDMS meeting country=United States
|CSDMS meeting state=Colorado
|CSDMS meeting email address=sean.gallen@colostate.edu
|CSDMS meeting phone=3157297939
}}
{{CSDMS meeting select clinics1 2026
|CSDMS_meeting_select_clinics1_2026=4) The Art of Modeling: From Concept to Math with Balance Equations
}}
{{CSDMS meeting select clinics2 2026
|CSDMS_meeting_select_clinics2_2026=2) PyCoGSS: Helping you (and your students!) wrangle big landscape data
}}
{{CSDMS meeting select clinics3 2026
|CSDMS_meeting_select_clinics3_2026=1) TopoRivBlender: Reproducible 3D Visualizations in Blender and Python
}}
{{CSDMS meeting abstract yes no 2026
|CSDMS meeting abstract submit 2026=Yes
}}
{{CSDMS meeting abstract poster Epub 2026
|CSDMS meeting poster Epub submit 2026=Poster
}}
{{CSDMS meeting abstract title temp2026
|CSDMS meeting abstract title=Geomorphic controls on suspended sediment dynamics in Puerto Rico
|Working_group_member_WG_FRG=Terrestrial Working Group, Critical Zone Focus Research Group
}}
{{CSDMS meeting abstract template 2026
|CSDMS meeting abstract=We analyzed USGS suspended sediment flux (Qs) and discharge (Qw) data from 61 Puerto Rican drainage basins (2-45 year records, 1967-2012) to identify controls on suspended sediment dynamics in mountain belts. Puerto Rico's central mountains span diverse crystalline rocks (granitic to ultramafic serpentine) and experience seasonal precipitation, with wet seasons when hurricanes and tropical low-pressure systems are common. Suspended sediment-derived erosion rates (0.61 ± 0.55 mm/yr) exceed longer timescale 10Be estimates by an order of magnitude, and show no clear relationship with topography, rock type, or mean annual precipitation. Despite topographic, geologic, and precipitation differences, normalized Qs statistics are similar across basins. Qs-Qw relationships show linear to weak clockwise hysteresis, but when considering runoff, they only exhibit linear to counterclockwise hysteresis, implying a system where sediment supply and transport are closely balanced. After major storms, most basins exhibit subtle clockwise hysteresis the following year. However, when accounting for runoff only, hysteresis is minimized, suggesting groundwater dilution and minimal storm-induced sediment loading. We identify a consistent runoff threshold (~0.2 mm/day) below which normalized Qs remains constant and above which it increases as a power function, representing rainfall needed to overcome threshold shear stress for sediment mobilization. This threshold explains why Qw probability distributions are light-tailed while Qs distributions are heavy-tailed. This phenomenon is attributed to a system where extreme events dominate suspended sediment transport, with>80% occurring during storms ≥10 times the mean discharge, and ~50% during storms ≥100 times the mean. Overall, Puerto Rico’s suspended sediment flux is weakly tied to landscape and climate variables but strongly governed by hydrologic extremes that control suspended sediment transport dynamics.
}}
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2024 CSDMS meeting-009

2024-01-22T21:19:24Z

Sfgallen:

{{CSDMS meeting personal information template-2024
|CSDMS meeting first name=Sean
|CSDMS meeting last name=Gallen
|CSDMS Pronouns=he/him
|CSDMS meeting institute=Colorado State University
|CSDMS meeting city=Fort Collins
|CSDMS meeting country=United States
|CSDMS meeting state=Colorado
|CSDMS meeting email address=sean.gallen@colostate.edu
|CSDMS meeting phone=(315) 729-7939
}}
{{CSDMS meeting select clinics1 2024
|CSDMS_meeting_select_clinics1_2024=1) Solving the sea level equation
}}
{{CSDMS meeting select clinics2 2024
|CSDMS_meeting_select_clinics2_2024=2) Introduction & Building with Google Earth Engine: Batteries Included
}}
{{CSDMS meeting select clinics3 2024
|CSDMS_meeting_select_clinics3_2024=4) A Hands-On Workshop on GPU-Based Landscape Evolution Modeling
}}
{{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=Climate modulation of spatial and temporal fault slip in the Sangre de Cristo Mountains, Colorado
|Working_group_member_WG_FRG=Terrestrial Working Group, Geodynamics Focus Research Group
}}
{{CSDMS meeting authors template
|CSDMS meeting coauthor first name abstract=Cece
|CSDMS meeting coauthor last name abstract=Hurtado
|CSDMS meeting coauthor institute / Organization=Colorado State University
|CSDMS meeting coauthor town-city=Fort Collins
|CSDMS meeting coauthor country=United States
|State=Colorado
|CSDMS meeting coauthor email address=Cecilia.Hurtado@colostate.edu
}}
{{CSDMS meeting abstract template 2024
|CSDMS meeting abstract=The impact of climate on tectonics has been the muse of tectonic geomorphologists for more than 30 years. However, few natural examples exist where connections between climate and tectonics are clear. Here, we present a study of the Sangre de Cristo Mountains (SCM), CO, a normal fault system at the northern tip of the Rio Grande Rift. The SCM represents an ideal natural setting to explore the impact of climate on spatial and temporal slip patterns along the range-bounding fault. Preserved glacial moraines and trimlines are used with the Glacier Reconstruction (GlaRe) toolbox to model glacial extents during the last glacial maximum (LGM). A simple line load model is used to explore the impact of glacial melting on clamping stress along the range front fault, and a flexural isostatic model is applied to estimate the footwall response to deglaciation. Results show that glacial melting reduces fault clamping stress, perhaps enabling accelerated fault slip in the post-glacial period. Flexural isostatic results suggest modest footwall uplift of ~4 m due to ice removal. We compare our results to fault displacement, measured from scarps preserved in Pleistocene and Holocene alluvial fans. The spatial pattern and magnitude of Holocene fault displacement are consistent with our flexural isostatic results. Furthermore, Holocene slip rates are at least a factor of three higher than Pleistocene slip rates. We infer that the flexural isostatic response to footwall deglaciation primarily controls the spatial and temporal fault slip patterns during the Holocene. Our results show that climate-modulated glacial ice loading and unloading can pace the spatial and temporal slip on a range-bounding normal fault system.
}}
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2024 CSDMS meeting-009

2024-01-19T21:32:52Z

Sfgallen: Created page with "{{CSDMS meeting personal information template-2024 |CSDMS meeting first name=Sean |CSDMS meeting last name=Gallen |CSDMS Pronouns=he/him |CSDMS meeting institute=Colorado State University |CSDMS meeting city=Fort Collins |CSDMS meeting country=United States |CSDMS meeting state=Colorado |CSDMS meeting email address=sean.gallen@colostate.edu |CSDMS meeting phone=(315) 729-7939 }} {{CSDMS meeting select clinics1 2024 |CSDMS_meeting_select_clinics1_2024=1) Solving the sea l..."

{{CSDMS meeting personal information template-2024
|CSDMS meeting first name=Sean
|CSDMS meeting last name=Gallen
|CSDMS Pronouns=he/him
|CSDMS meeting institute=Colorado State University
|CSDMS meeting city=Fort Collins
|CSDMS meeting country=United States
|CSDMS meeting state=Colorado
|CSDMS meeting email address=sean.gallen@colostate.edu
|CSDMS meeting phone=(315) 729-7939
}}
{{CSDMS meeting select clinics1 2024
|CSDMS_meeting_select_clinics1_2024=1) Solving the sea level equation
}}
{{CSDMS meeting select clinics2 2024
|CSDMS_meeting_select_clinics2_2024=2) Introduction & Building with Google Earth Engine: Batteries Included
}}
{{CSDMS meeting select clinics3 2024
|CSDMS_meeting_select_clinics3_2024=4) A Hands-On Workshop on GPU-Based Landscape Evolution Modeling
}}
{{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=A climate imprint on unglaciated hillslope morphology in the Colorado Front Range
|Working_group_member_WG_FRG=Terrestrial Working Group, Critical Zone Focus Research Group
}}
{{CSDMS meeting abstract template 2024
|CSDMS meeting abstract=The role of climate in shaping unglaciated hillslope topography remains unclear, yet it can impact the transport and routing of surface water and sediment through its influence on surface slope, drainage density, and sediment transport efficiency. In this study, we take advantage of the dramatic altitudinal climate gradient in the Poudre Drainage Basin in Northern Colorado to evaluate the impact of climate on hillslope morphology. We hypothesize systematic changes in hillslope morphology exist across this elevation gradient, driven by climate-dependent variation in hillslope sediment transport efficiency. Using a 1-m resolution lidar-derived digital elevation model, we use existing methods to define stream channel heads, map drainage divides, and quantify hillslope length, relief, gradient, and curvature. From low to high elevation, hillslopes lengthen >300 m, while relief increases only ~50 m. Mean hillslope gradient and hilltop curvature systematically decrease from low to high elevation. Topographic proxies for bedrock exposure (an inverse proxy for regolith depth) systematically decline with increasing elevation. Because existing 10Be-derived erosion rates are consistently between ~15 – 20 m/Myr, spatial changes in erosion rates cannot account for the differences in hillslope morphology. To explain the variation in hillslope morphology as a function of elevation, we place our results in a non-dimensional, nonlinear hillslope diffusion modeling framework. This analysis suggests that topography at higher elevations is further from steady-state predictions of hillslope morphology relative to lower elevations. We interpret these results as indicating that the hillslope sediment transport efficiency systematically increases with increasing altitude, which can explain the longer, rounder hillslopes at higher elevations. We infer that late Cenozoic climate change might be forcing a transient adjustment of hillslope morphology by elevating regolith production and transport rates through increased frost cracking intensity at high elevations. These elevation-dependent changes in hillslope characteristics likely affect hydrology, sediment transport, and landscape connectivity in ways that might relate to post-wildfire and rainfall-triggered slope stability hazard potential in Colorado.
}}
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2023 CSDMS meeting-103

2023-03-29T17:28:15Z

Sfgallen: Created page with "{{CSDMS meeting personal information template-2023 |CSDMS meeting first name=Sean |CSDMS meeting last name=Gallen |CSDMS Pronouns=he/him |CSDMS meeting institute=Department of Geosciences, Colorado State University |CSDMS meeting city=Fort Collins |CSDMS meeting country=United States |CSDMS meeting state=CO |CSDMS meeting email address=sean.gallen@colostate.edu |CSDMS meeting phone=3157297939 }} {{CSDMS meeting select clinics1 2023 |CSDMS_meeting_select_clinics1_2023=3)..."

{{CSDMS meeting personal information template-2023
|CSDMS meeting first name=Sean
|CSDMS meeting last name=Gallen
|CSDMS Pronouns=he/him
|CSDMS meeting institute=Department of Geosciences, Colorado State University
|CSDMS meeting city=Fort Collins
|CSDMS meeting country=United States
|CSDMS meeting state=CO
|CSDMS meeting email address=sean.gallen@colostate.edu
|CSDMS meeting phone=3157297939
}}
{{CSDMS meeting select clinics1 2023
|CSDMS_meeting_select_clinics1_2023=3) Using GPUs to Solve Science Problems Faster
}}
{{CSDMS meeting select clinics2 2023
|CSDMS_meeting_select_clinics2_2023=2) Coupling models of lithospheric deformation and surface processes (ASPECT)
}}
{{CSDMS meeting select clinics3 2023
|CSDMS_meeting_select_clinics3_2023=4) Will not attend a clinic this day
}}
{{CSDMS meeting abstract yes no 2023
|CSDMS meeting abstract submit 2023=Yes
}}
{{CSDMS meeting abstract poster Epub 2023
|CSDMS meeting poster Epub submit 2023=Poster
}}
{{CSDMS meeting abstract title temp2023
|CSDMS meeting abstract title=Slab-mantle interactions pace forearc uplift during subduction retreat in the Central Mediterranean
|Working_group_member_WG_FRG=Terrestrial Working Group, Geodynamics Focus Research Group
}}
{{CSDMS meeting authors template
|CSDMS meeting coauthor first name abstract=Nikki
|CSDMS meeting coauthor last name abstract=Seymour
|CSDMS meeting coauthor institute / Organization=Department of Geological Sciences, Stanford University
|CSDMS meeting coauthor town-city=Stanford
|CSDMS meeting coauthor country=United States
|State=California
}}
{{CSDMS meeting authors template
|CSDMS meeting coauthor first name abstract=Christoph
|CSDMS meeting coauthor last name abstract=Glotzbach
|CSDMS meeting coauthor institute / Organization=Department of Geosciences, University of Tübingen
|CSDMS meeting coauthor town-city=Tübingen
|CSDMS meeting coauthor country=Germany
}}
{{CSDMS meeting authors template
|CSDMS meeting coauthor first name abstract=Daniel
|CSDMS meeting coauthor last name abstract=Stockli
|CSDMS meeting coauthor institute / Organization=Department of Geological Sciences, University of Texas at Austin
|CSDMS meeting coauthor town-city=Austin
|CSDMS meeting coauthor country=United States
|State=Texas
}}
{{CSDMS meeting authors template
|CSDMS meeting coauthor first name abstract=Paul
|CSDMS meeting coauthor last name abstract=O'Sullivan
|CSDMS meeting coauthor institute / Organization=GeoSep Services
|CSDMS meeting coauthor town-city=Moscow
|CSDMS meeting coauthor country=United States
|State=Idaho
}}
{{CSDMS meeting abstract template 2023
|CSDMS meeting abstract=Landscapes are sensitive recorders of deep Earth processes that we cannot otherwise directly observe and can provide critical constraints on the geodynamic processes involved in subduction zone orogenesis. Here, we recover continuous 30 Myr rock uplift histories for three bedrock catchments in the forearc above the Calabrian subduction zone, a classic example of a retreating subduction system in southern Italy. Construction of the long-term rock uplift record is enabled by a novel data-driven inversion of tectonic geomorphology measurements, which include low-temperature thermochronology, cosmogenic radionuclides, marine terraces, and fluvial topography. Rock uplift histories from all catchments are similar, exhibiting high rates (>1 mm/yr) from ~30 – 25 Ma that progressively decline to <0.4 mm/yr by ~15 Ma and stay low before abruptly increasing to ~0.65 mm/yr at ~1.5 – 1.0 Ma. The rock uplift results bear little resemblance to the subduction velocity history, implying that crustal thickening through changes in accretionary flux does not dominate uplift during the subduction history. Through comparisons with slab descent reconstructions, we argue that the forearc uplift history primarily reflects the progressive establishment and abrupt destruction of an upper mantle convection cell with strong negative buoyancy beneath the forearc. As the slab freely descended through the upper mantle, the size and vigor of the convection cell grew, slowly drawing forward rock uplift rates down from ~25 – 15 Ma. Once the slab encountered the 660 km mantle transition zone, the convection cell was fully established, subduing uplift rates before slab fragmentation and associated small-scale mantle flow disrupted this condition in the Quaternary, facilitating rapid forearc rock uplift.
}}
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Meeting confirmation CTSP 2018-016

2018-02-05T23:02:57Z

Sfgallen: Created page with "{{Meeting confirmation personal information |CSDMSmeetingPerson=Sfgallen |MeetingAcceptDecline=Accept }} {{Meeting logistics |Hotelnights=Tuesday April 24, Wednesday April 25,..."

{{Meeting confirmation personal information
|CSDMSmeetingPerson=Sfgallen
|MeetingAcceptDecline=Accept
}}
{{Meeting logistics
|Hotelnights=Tuesday April 24, Wednesday April 25, Thursday April 26
|MultipleRoomMate=Yes
|RoomGender=Male
|RoomMatePreference=J. Ryan Thigpen
|DinnerYesNo=Yes
|MainCourse=Chicken
}}
{{Meeting abstract yes no
|CSDMS meeting abstract submit=Yes
}}
{{CSDMS meeting abstract title temp CTSP
|CSDMS_meeting_abstract_title=Lithology, landscape dynamics, and intraplate earthquakes in ancient mountain belts
}}

Meeting application CTSP 2018-013

2017-12-04T10:05:19Z

Sfgallen: Created page with "{{Meeting personal information |CSDMS meeting first name=Sean |CSDMS meeting last name=Gallen |CSDMS meeting affiliation=Colorado State Univeristy |CSDMS meeting city=Fort Col..."

{{Meeting personal information
|CSDMS meeting first name=Sean
|CSDMS meeting last name=Gallen
|CSDMS meeting affiliation=Colorado State Univeristy
|CSDMS meeting city=Fort Collins
|CSDMS meeting country=United States
|CSDMS meeting state=Colorado
|CSDMS meeting email address=sean.gallen@colostate.edu
}}
{{Meeting statement interest
|Meetingstatement_of_interest_submit=I am a tectonic geomorphologist interested in studying interactions between Earth surface processes, tectonics, and climate. Most of my research projects integrate field observations, geochronology, data analysis and numerical modeling to test specific hypotheses. I am interested in attending the Coupling of Tectonic and Surface Processes workshop for several reasons. First, as an early career scientist (I will be beginning as an Assistant Professor at CSU in January of 2018), I am excited to interact with other like-minded researchers and hope to foster new collaborations through participation in the workshop. Second, I am interested in learning what software is available through the CIG and CSDMS communities that I might be unaware of which might benefit my current research. Finally, I would like to talk with other scientists about ideas that I have to integrate some of my existing numerical models into the new LandLab landscape evolution model and gauge community interest in building these modules.
}}
{{Meeting abstract yes no
|CSDMS meeting abstract submit=No
}}