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Articles 1 - 3 of 3
Full-Text Articles in Hydrology
The Periglacial Landscape Of Mars: Insight Into The 'Decameter-Scale Rimmed Depressions' In Utopia Planitia, Arya Bina
Electronic Thesis and Dissertation Repository
Currently, Mars appears to be in a ‘frozen’ and ‘dry’ state, with the clear majority of the planet’s surface maintaining year-round sub-zero temperatures. However, the discovery of features consistent with landforms found in periglacial environments on Earth, suggests a climate history for Mars that may have involved freeze and thaw cycles. Such landforms include hummocky, polygonised, scalloped, and pitted terrains, as well as ice-rich deposits and gullies, along the mid- to high-latitude bands, typically with no lower than 20o N/S. The detection of near-surface and surface ice via the Phoenix lander, excavation of ice via recent impact cratering activity as …
Modelling The Thermal Transport Of A Thawing Permafrost Plateau, Joelle E. Langford
Modelling The Thermal Transport Of A Thawing Permafrost Plateau, Joelle E. Langford
Electronic Thesis and Dissertation Repository
Permafrost covers approximately 24% of the Northern Hemisphere and is in a state of decay which has large implications. To characterize the processes involved in the transitional period of permafrost decay, a three-dimensional finite element numerical model is developed. The model is based on the Scotty Creek Research Basin in the Northwest Territories, Canada (61°18'N, 121°18'W). FEFLOW groundwater flow and heat transport modelling software is used in conjunction with the piFreeze plug-in, to account for phase changes between ice and water. As transiently simulating actual permafrost evolution would require 100’s of years of climate variations over an evolving landscape, whose …
Expanding The "Active Layer", Peter Ashmore, Sarah Peirce, Pauline Leduc
Expanding The "Active Layer", Peter Ashmore, Sarah Peirce, Pauline Leduc
Geography & Environment Publications
Church and Haschenburger (2017) make helpful distinctions around the issue of defining the active layer, with which we agree. We propose expanding discussion and definition of the ”active layer” in fluvial bedload transport to include the concept of the “morphological active layer”. This is particularly applicable to laterally unstable rivers (such as braided rivers) in which progressive morphological change over short time periods is the process by which much of the bedload transport occurs. The morphological active layer is also distinguished by variable lateral and longitudinal extent continuity over a range of flows and transport intensity. We suggest that the …