Details
| Translated title of the contribution | Dynamische Modellierung subglazialer Schmelzwassererosion in vergangenen und zukünftigen Vereisungen |
|---|---|
| Original language | English |
| Publication status | Accepted/In press - 19 Jul 2023 |
| Event | XXI INQUA 2023 Roma: Time for Change - Sapienza Universität, Rom, Italy Duration: 14 Jul 2023 → 20 Jul 2023 https://inquaroma2023.org/ |
Conference
| Conference | XXI INQUA 2023 Roma |
|---|---|
| Country/Territory | Italy |
| City | Rom |
| Period | 14 Jul 2023 → 20 Jul 2023 |
| Internet address |
Abstract
First, we build a 3D subsurface model of northern Germany to facilitate the reconstruction of ice sheet and subglacial topography during past glaciations. The subsurface model is based on the depth maps of the Geotectonic Atlas of North-western Germany, geophysical data and borehole data (GTA3D, TUNB3D-NI). Subsequently, the sedimentary units and hydrogeological properties are integrated into a geological grid model. The subsurface model will allow us to tune numerical hydrology and erosion simulations with linked drainage systems consisting of distributed and channelized components.
The hydraulic model is based on the principles of subglacial channel formation and fluvial erosion and is parameterized against tunnel valley formation during past glaciations. This model framework will be the first to use realistic sediment mechanics and 3D geological geometries to assess subglacial channel stability, evolution, and erosion. It will be used to estimate meltwater-driven erosion and sediment transport during future glaciations, with special emphasis on quantifying the north-to-south distribution of the maximum depth of meltwater erosion and associated environmental challenges in northern Germany. A particular focus will be on scrutinizing a proposed critical erosion depth of 600-800 m, which is relevant for planning repository sites for high-level radioactive waste.
Keywords
- Subglacial erosion, subsurface modelling, tunnel valleys
Research Area (based on ÖFOS 2012)
- NATURAL SCIENCES
- Geosciences
- Geology, Mineralogy
- Sedimentology
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2023. Abstract from XXI INQUA 2023 Roma, Rom, Italy.
Research output: Contribution to conference › Abstract › Research
}
TY - CONF
T1 - Dynamical modelling of subglacial meltwater erosion during past and future glaciations
AU - Fälber, Runa
AU - Damsgaard, Anders
AU - Piotrowski, Jan
AU - Winsemann, Jutta
PY - 2023/7/19
Y1 - 2023/7/19
N2 - A large portion of meltwater from ice sheets and glaciers drains along the ice-bed interface, influencing the ice-flow dynamics. It is known from the geological record and modern glacial systems that channelized subglacial drainage generates high erosion rates and can form overdeepenings and tunnel valleys. We use the geological record and numerical modelling to quantify the meltwater-driven erosive potential during future glaciations in northern Germany. To achieve this goal, we develop and deploy a next-generation dynamical model for subglacial meltwater erosion on soft beds.First, we build a 3D subsurface model of northern Germany to facilitate the reconstruction of ice sheet and subglacial topography during past glaciations. The subsurface model is based on the depth maps of the Geotectonic Atlas of North-western Germany, geophysical data and borehole data (GTA3D, TUNB3D-NI). Subsequently, the sedimentary units and hydrogeological properties are integrated into a geological grid model. The subsurface model will allow us to tune numerical hydrology and erosion simulations with linked drainage systems consisting of distributed and channelized components.The hydraulic model is based on the principles of subglacial channel formation and fluvial erosion and is parameterized against tunnel valley formation during past glaciations. This model framework will be the first to use realistic sediment mechanics and 3D geological geometries to assess subglacial channel stability, evolution, and erosion. It will be used to estimate meltwater-driven erosion and sediment transport during future glaciations, with special emphasis on quantifying the north-to-south distribution of the maximum depth of meltwater erosion and associated environmental challenges in northern Germany. A particular focus will be on scrutinizing a proposed critical erosion depth of 600-800 m, which is relevant for planning repository sites for high-level radioactive waste.
AB - A large portion of meltwater from ice sheets and glaciers drains along the ice-bed interface, influencing the ice-flow dynamics. It is known from the geological record and modern glacial systems that channelized subglacial drainage generates high erosion rates and can form overdeepenings and tunnel valleys. We use the geological record and numerical modelling to quantify the meltwater-driven erosive potential during future glaciations in northern Germany. To achieve this goal, we develop and deploy a next-generation dynamical model for subglacial meltwater erosion on soft beds.First, we build a 3D subsurface model of northern Germany to facilitate the reconstruction of ice sheet and subglacial topography during past glaciations. The subsurface model is based on the depth maps of the Geotectonic Atlas of North-western Germany, geophysical data and borehole data (GTA3D, TUNB3D-NI). Subsequently, the sedimentary units and hydrogeological properties are integrated into a geological grid model. The subsurface model will allow us to tune numerical hydrology and erosion simulations with linked drainage systems consisting of distributed and channelized components.The hydraulic model is based on the principles of subglacial channel formation and fluvial erosion and is parameterized against tunnel valley formation during past glaciations. This model framework will be the first to use realistic sediment mechanics and 3D geological geometries to assess subglacial channel stability, evolution, and erosion. It will be used to estimate meltwater-driven erosion and sediment transport during future glaciations, with special emphasis on quantifying the north-to-south distribution of the maximum depth of meltwater erosion and associated environmental challenges in northern Germany. A particular focus will be on scrutinizing a proposed critical erosion depth of 600-800 m, which is relevant for planning repository sites for high-level radioactive waste.
KW - Subglaziale Erosion
KW - Tunnel Valleys
KW - Subglacial erosion
KW - subsurface modelling
KW - tunnel valleys
M3 - Abstract
T2 - XXI INQUA 2023 Roma
Y2 - 14 July 2023 through 20 July 2023
ER -