Filtering by Subject: Geomorphology

The influence of rock uplift rate on the formation and preservation of individual marine terraces during multiple sea level stands

Luca Malatesta, Noah J. Finnegan, Kimberly L. Huppert, Emily I. Carreño

Published: 2021-05-13
Subjects: Climate, Geology, Geomorphology

Marine terraces are a cornerstone for the study of paleo sea level and crustal deformation. Commonly, individual erosive marine terraces are attributed to unique sea level high-stands. This stems from early reasoning that erosive marine platforms could only be significantly widened at the beginning of an interglacial. However, this implies that wave erosion is insignificant during the vast [...]

Syn- to post-rift alluvial basin fill: seismic stratigraphic analysis of Permian-Triassic deposition in the Horda Platform, Norway

Camilla Würtzen, Johnathon Lee Osmond, Jan Inge Faleide, Johan Petter Nystuen, Ingrid Margareta Anell, Ivar Midtkandal

Published: 2021-05-02
Subjects: Geology, Geomorphology, Sedimentology, Stratigraphy, Tectonics and Structure

Discrepancies in models of continental rift-basin dynamics and stratigraphic response calls on further investigation on the subject. Geometric- and lithological trends between stages of faulting is studied in the Permian- Triassic continental rift succession in the Horda Platform. The Horda Platform occupies the northeastern margin of the North Sea aulacogen where Late Permian-Early Triassic [...]

Barrier islands as coupled human–landscape systems

Dylan McNamara, Eli Lazarus

Published: 2021-04-09
Subjects: Geomorphology, Nature and Society Relations, Sustainability

There are nearly 300 barrier islands between Maine and Texas, and of these, at least 70 are intensively developed. Mean population density along the U.S. Atlantic and Gulf coasts are the highest in the country. Such concentrated development exists and continues despite the fact that barrier islands are transient landscapes, not only over geologic time scales of millennia but also within human and [...]

Rectangular drainage pattern evolution controlled by pipe cave collapse along clastic dikes, the Dead Sea Basin, Israel

Liran Goren, Matanya Hamawi, Amit Mushkin, Tsafrir Levi

Published: 2021-04-09
Subjects: Geomorphology, Tectonics and Structure

The concavity of modern submarine canyon longitudinal profiles

Euan Soutter, Ian Kane, David Mark Hodgson, Stephen S. Flint

Published: 2021-04-07
Subjects: Earth Sciences, Geology, Geomorphology, Physical Sciences and Mathematics, Sedimentology

Submarine canyons incise into continental shelves and slopes, and are important conduits for the transport of sediment, nutrients, organic carbon and pollutants from continents to oceans. Submarine canyons bear morphological similarities to subaerial valleys, such as their longitudinal (long) profiles. Long profiles record the interaction between erosion and uplift, making their shape, or [...]

Transmissivity and groundwater flow exert a strong influence on drainage density

Elco Luijendijk

Published: 2021-04-07
Subjects: Geomorphology, Hydrology

The extent to which groundwater flow affects drainage density and erosion has long been debated, but is still uncertain. Here, I present a new hybrid analytical and numerical model that simulates groundwater flow, overland flow, hillslope erosion and stream incision. The model is used to explore the relation between groundwater flow and the incision and persistence of streams for a set of [...]

Benthic biofilm potential for organic carbon accumulation in salt marsh sediments

Kendall Valentine, Abbey Hotard, Tracy Elsey-Quirk, giulio mariotti

Published: 2021-04-02
Subjects: Biogeochemistry, Earth Sciences, Geomorphology

Coastal salt marshes are productive environments with high potential for carbon accumulation and storage. Even though organic carbon in salt marsh sediment is typically attributed to plant biomass, it can also be produced by benthic photosynthetic biofilms. These biofilms, generally composed of diatoms and their secretions, are known for their high primary productivity and contribution to the [...]

Low variability, snowmelt runoff inhibits coupling of climate, tectonics, and topography in the Greater Caucasus

Adam Matthew Forte, Joel Leonard, Matthew Rossi, Kelin Whipple, Arjun Heimsath, Lasha Sukhishvili, Tea Godoladze, Fakhraddin Kadirov

Published: 2021-03-23
Subjects: Geomorphology, Tectonics and Structure

Hypothesized feedbacks between climate and tectonics are mediated by the relationship between topography and long-term erosion rates. While many studies show monotonic relationships between channel steepness and erosion rates, the degree of nonlinearity in this relationship is geographically variable. There is a critical need to mechanistically explain controls on this relationship in natural [...]

Long-term evolution of Earth's continental surface elevation

Shanan E Peters, David B Rowley

Published: 2021-03-17
Subjects: Geology, Geomorphology

Determining the timescale over which continental surface elevation (hypsometry) evolves is difficult because it reflects a combination of isostasy and dynamic topography operating in concert with erosion and deposition. Here, we use 252 million year old and younger shallow marine sediments exposed at the surface as tracers of net change in continental surface elevation over time. In aggregate, we [...]

The Sidi Ifni transect across the rifted margin of Morocco (Central Atlantic): Vertical movements constrained by low-temperature thermochronology

Remi J.G. Charton, Giovanni Bertotti, Angel Arantegui, Luc Bulot

Published: 2021-03-17
Subjects: Earth Sciences, Geology, Geomorphology, Paleontology, Sedimentology, Stratigraphy, Tectonics and Structure

The occurrence of km-scale exhumations during syn- and post-rift stages has been documented along Atlantic continental margins, which are also characterised by basins undergoing substantial subsidence. The relationship between the exhuming and subsiding domains is poorly understood. In this study, we reconstruct the evolution of a 50 km long transect across the Moroccan rifted margin from the [...]

Prototyping a collaborative data curation service for coastal science

Evan B Goldstein, Anna E Braswell, Caitlin M Mc Shane

Published: 2021-03-16
Subjects: Environmental Sciences, Geomorphology, Physical Sciences and Mathematics

The growing push for open data has resulted in an abundance of data for coastal researchers, which can lead to problems for individual researchers related to discoverability of relevant data. One solution is to explicitly develop services for coastal researchers to help curate data for discovery, hosting discussions around reuse, community building, and finding collaborators. To develop the idea [...]

Central Himalayan rivers record the topographic signature of erosion by glacial lake outburst floods

Maxwell Philip Dahlquist, A. Joshua West

Published: 2021-03-11
Subjects: Earth Sciences, Geomorphology

In steep landscapes, river incision sets the pace of landscape evolution. Transport of coarse sediment controls incision by evacuating material delivered to river channels by landslides. However, large boulders that impede bedrock erosion are immobile even in major runoff-driven floods. Glacial lake outburst floods (GLOFs) mobilize these boulders and drive incision, yet their role in [...]

Decadal shoreline erosion and recovery of beaches in modified and natural estuaries

Thomas Edmund Twysden Fellowes, Ana Vila-Concejo, Shari L Gallop, Ryan Schosberg, Vincent De Staercke, John Largier

Published: 2021-03-08
Subjects: Geomorphology, Physical Sciences and Mathematics

Sandy beaches in estuaries and bays (BEBs) are common landforms on the coasts of many major cities. They exist under a wide range of settings and their morphology is controlled by their distance from the estuary/bay entrance, exposure to different types of waves (e.g., ocean swells vs locally generated wind waves), proximity to flood-tide delta/shoals, and anthropogenic interventions (e.g., [...]

New insight into post-seismic landslide evolution processes in the tropics

Hakan Tanyas, Dalia Kirschbaum, Tolga Gorum, Cees J. van Westen, Luigi Lombardo

Published: 2021-03-05
Subjects: Earth Sciences, Geomorphology, Geophysics and Seismology, Hydrology

Earthquakes do not only trigger landslides in co-seismic phases but also elevate post-seismic landslide susceptibility either by causing a strength reduction in hillslope materials or by producing co-seismic landslide deposits, which are prone to further remobilization under the external forces generated by subsequent rainfall events. However, we still have limited observations regarding the [...]

Space-time susceptibility modeling of hydro-morphological processes at the Chinese national scale

Nan Wang, Luigi Lombardo, Weiming Cheng, Mattia Marconcini, Felix Bachofer, Liang Guo, Junnan Xiong

Published: 2021-03-05
Subjects: Geomorphology

Hydro-morphological processes (HMP; any process in the spectrum between debris flows and flash floods) threaten human infrastructures and lives; and their effects are only expected to worsen in the context of climate change. One of the ways to limit the potential damage of HMP is to take preventive or remedial actions probabilistically knowing where and how frequently they may occur. The expected [...]


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