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Topographic Response to Horizontal Advection in Normal Fault‐Bound Mountain Ranges

Tectonic displacements consist of vertical uplift or subsidence, and horizontal advection. We consider the effects of tectonic advection on mountain range topography, surface drainage patterns and drainage divides. Through numerically modeling a normal fault and uplifted footwall, we find that advec...

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Published in:Journal of geophysical research. Earth surface 2023-08, Vol.128 (8), p.n/a
Main Authors: Hoskins, A. M., Attal, M., Mudd, S. M., Castillo, M.
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description Tectonic displacements consist of vertical uplift or subsidence, and horizontal advection. We consider the effects of tectonic advection on mountain range topography, surface drainage patterns and drainage divides. Through numerically modeling a normal fault and uplifted footwall, we find that advection promotes the elongation of catchments and reduction in outlet spacing at mountain fronts. We demonstrate an erosional disequilibrium associated with the advection‐induced transfer of mass from the proximal mountain front toward the distal mountain front. Our modeling also demonstrates the development of an erosion rate disequilibrium around fixed geomorphic features such as drainage divides, that we deem characteristic of advection. In our model, steady‐state is achieved when the divide migration occurs at the same rate as advection; advection moves topography away from the fault, meaning drainage migration becomes a mechanism for balancing advection. Topographic observations in a mountain range bound by a low angle normal fault, the Sierra la Laguna (Mexico), are consistent with our modeling results when advection is included. These observations reveal a strong influence of advection on the development of the Sierra la Laguna's topography and suggest the main drainage divide is migrating toward the fault to counterbalance advection. Tectonic advection exerts a significant control on erosion rate distribution, topographic and drainage patterns and the stability of drainage divides. This work also highlights that the Gilbert metrics and across‐divide χ disequilibrium cannot always be interpreted in terms of growing or shrinking catchments in settings with a large advection component of tectonic displacement. Plain Language Summary All mountains experience tectonic motion: vertical motion (uplift or subsidence) and horizontal motion (advection). Here, we use equations that describe how features such as rivers and hillslopes change with time to model the growth of a mountain. We model displacement on a normal fault, which typically forms when the Earth's crust is stretched. We find that advection has a very strong impact on the shape of the landscape: river basins become longer and narrower when advection is faster. We also see the development of differences in erosion rates that allow the main ridgeline to migrate toward the fault at the same rate the land is moved away from the fault: at that point, the shape of the mountain is not changing anymore, despite
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M. ; Attal, M. ; Mudd, S. M. ; Castillo, M.</creator><creatorcontrib>Hoskins, A. M. ; Attal, M. ; Mudd, S. M. ; Castillo, M.</creatorcontrib><description>Tectonic displacements consist of vertical uplift or subsidence, and horizontal advection. We consider the effects of tectonic advection on mountain range topography, surface drainage patterns and drainage divides. Through numerically modeling a normal fault and uplifted footwall, we find that advection promotes the elongation of catchments and reduction in outlet spacing at mountain fronts. We demonstrate an erosional disequilibrium associated with the advection‐induced transfer of mass from the proximal mountain front toward the distal mountain front. Our modeling also demonstrates the development of an erosion rate disequilibrium around fixed geomorphic features such as drainage divides, that we deem characteristic of advection. In our model, steady‐state is achieved when the divide migration occurs at the same rate as advection; advection moves topography away from the fault, meaning drainage migration becomes a mechanism for balancing advection. Topographic observations in a mountain range bound by a low angle normal fault, the Sierra la Laguna (Mexico), are consistent with our modeling results when advection is included. These observations reveal a strong influence of advection on the development of the Sierra la Laguna's topography and suggest the main drainage divide is migrating toward the fault to counterbalance advection. Tectonic advection exerts a significant control on erosion rate distribution, topographic and drainage patterns and the stability of drainage divides. This work also highlights that the Gilbert metrics and across‐divide χ disequilibrium cannot always be interpreted in terms of growing or shrinking catchments in settings with a large advection component of tectonic displacement. Plain Language Summary All mountains experience tectonic motion: vertical motion (uplift or subsidence) and horizontal motion (advection). Here, we use equations that describe how features such as rivers and hillslopes change with time to model the growth of a mountain. We model displacement on a normal fault, which typically forms when the Earth's crust is stretched. We find that advection has a very strong impact on the shape of the landscape: river basins become longer and narrower when advection is faster. We also see the development of differences in erosion rates that allow the main ridgeline to migrate toward the fault at the same rate the land is moved away from the fault: at that point, the shape of the mountain is not changing anymore, despite constant advection and some places eroding much faster than others. This situation is analogous to the formation of a standing wave in a river: the wave looks static despite water moving downstream. We find similar features in the Sierra la Laguna (Mexico), including elongated catchments and evidence that the main ridgeline is actively migrating toward the fault. This helps to validate the model, and highlights that advection can make landscapes more dynamic than expected. Key Points Divide migration is required to balance advection and maintain spatially fixed drainage divides in steady‐state landscapes with advection Elongate catchments and erosional disequilibrium at divides are diagnostic of strong advection, as observed in Sierra la Laguna, Mexico Divide migration can occur without affecting the drainage area of adjacent catchments in the presence of a high tectonic advection velocity</description><identifier>ISSN: 2169-9003</identifier><identifier>EISSN: 2169-9011</identifier><identifier>DOI: 10.1029/2023JF007126</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Advection ; Catchment area ; Catchments ; divide migration ; Drainage ; Drainage patterns ; Earth crust ; Elongation ; Erosion control ; Erosion rates ; Fronts ; Geomorphology ; Horizontal advection ; Horizontal motion ; Landscape ; landscape evolution ; Modelling ; Mountains ; Movement ; numerical modeling ; Outlets ; River basins ; Rivers ; Shape ; Standing waves ; Subsidence ; Surface drainage ; tectonic advection ; Tectonics ; Topography ; Uplift ; Vertical motion</subject><ispartof>Journal of geophysical research. 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M.</creatorcontrib><creatorcontrib>Attal, M.</creatorcontrib><creatorcontrib>Mudd, S. M.</creatorcontrib><creatorcontrib>Castillo, M.</creatorcontrib><title>Topographic Response to Horizontal Advection in Normal Fault‐Bound Mountain Ranges</title><title>Journal of geophysical research. Earth surface</title><description>Tectonic displacements consist of vertical uplift or subsidence, and horizontal advection. We consider the effects of tectonic advection on mountain range topography, surface drainage patterns and drainage divides. Through numerically modeling a normal fault and uplifted footwall, we find that advection promotes the elongation of catchments and reduction in outlet spacing at mountain fronts. We demonstrate an erosional disequilibrium associated with the advection‐induced transfer of mass from the proximal mountain front toward the distal mountain front. Our modeling also demonstrates the development of an erosion rate disequilibrium around fixed geomorphic features such as drainage divides, that we deem characteristic of advection. In our model, steady‐state is achieved when the divide migration occurs at the same rate as advection; advection moves topography away from the fault, meaning drainage migration becomes a mechanism for balancing advection. Topographic observations in a mountain range bound by a low angle normal fault, the Sierra la Laguna (Mexico), are consistent with our modeling results when advection is included. These observations reveal a strong influence of advection on the development of the Sierra la Laguna's topography and suggest the main drainage divide is migrating toward the fault to counterbalance advection. Tectonic advection exerts a significant control on erosion rate distribution, topographic and drainage patterns and the stability of drainage divides. 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Earth surface</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hoskins, A. M.</au><au>Attal, M.</au><au>Mudd, S. M.</au><au>Castillo, M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Topographic Response to Horizontal Advection in Normal Fault‐Bound Mountain Ranges</atitle><jtitle>Journal of geophysical research. Earth surface</jtitle><date>2023-08</date><risdate>2023</risdate><volume>128</volume><issue>8</issue><epage>n/a</epage><issn>2169-9003</issn><eissn>2169-9011</eissn><abstract>Tectonic displacements consist of vertical uplift or subsidence, and horizontal advection. We consider the effects of tectonic advection on mountain range topography, surface drainage patterns and drainage divides. Through numerically modeling a normal fault and uplifted footwall, we find that advection promotes the elongation of catchments and reduction in outlet spacing at mountain fronts. We demonstrate an erosional disequilibrium associated with the advection‐induced transfer of mass from the proximal mountain front toward the distal mountain front. Our modeling also demonstrates the development of an erosion rate disequilibrium around fixed geomorphic features such as drainage divides, that we deem characteristic of advection. In our model, steady‐state is achieved when the divide migration occurs at the same rate as advection; advection moves topography away from the fault, meaning drainage migration becomes a mechanism for balancing advection. Topographic observations in a mountain range bound by a low angle normal fault, the Sierra la Laguna (Mexico), are consistent with our modeling results when advection is included. These observations reveal a strong influence of advection on the development of the Sierra la Laguna's topography and suggest the main drainage divide is migrating toward the fault to counterbalance advection. Tectonic advection exerts a significant control on erosion rate distribution, topographic and drainage patterns and the stability of drainage divides. This work also highlights that the Gilbert metrics and across‐divide χ disequilibrium cannot always be interpreted in terms of growing or shrinking catchments in settings with a large advection component of tectonic displacement. Plain Language Summary All mountains experience tectonic motion: vertical motion (uplift or subsidence) and horizontal motion (advection). Here, we use equations that describe how features such as rivers and hillslopes change with time to model the growth of a mountain. We model displacement on a normal fault, which typically forms when the Earth's crust is stretched. We find that advection has a very strong impact on the shape of the landscape: river basins become longer and narrower when advection is faster. We also see the development of differences in erosion rates that allow the main ridgeline to migrate toward the fault at the same rate the land is moved away from the fault: at that point, the shape of the mountain is not changing anymore, despite constant advection and some places eroding much faster than others. This situation is analogous to the formation of a standing wave in a river: the wave looks static despite water moving downstream. We find similar features in the Sierra la Laguna (Mexico), including elongated catchments and evidence that the main ridgeline is actively migrating toward the fault. This helps to validate the model, and highlights that advection can make landscapes more dynamic than expected. Key Points Divide migration is required to balance advection and maintain spatially fixed drainage divides in steady‐state landscapes with advection Elongate catchments and erosional disequilibrium at divides are diagnostic of strong advection, as observed in Sierra la Laguna, Mexico Divide migration can occur without affecting the drainage area of adjacent catchments in the presence of a high tectonic advection velocity</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2023JF007126</doi><tpages>30</tpages><orcidid>https://orcid.org/0000-0002-6447-6492</orcidid><orcidid>https://orcid.org/0000-0001-8639-6090</orcidid><orcidid>https://orcid.org/0000-0002-7638-5627</orcidid><oa>free_for_read</oa></addata></record>
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source Wiley Online Library AGU 2016; Wiley-Blackwell Read & Publish Collection
subjects Advection
Catchment area
Catchments
divide migration
Drainage
Drainage patterns
Earth crust
Elongation
Erosion control
Erosion rates
Fronts
Geomorphology
Horizontal advection
Horizontal motion
Landscape
landscape evolution
Modelling
Mountains
Movement
numerical modeling
Outlets
River basins
Rivers
Shape
Standing waves
Subsidence
Surface drainage
tectonic advection
Tectonics
Topography
Uplift
Vertical motion
title Topographic Response to Horizontal Advection in Normal Fault‐Bound Mountain Ranges
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