ice rheology; glacial earthquakes; glacier calving; InSAR; glacier; remote sensing; ice sheet; Greenland; interferometric radar; fracture mechanics; ice dynamcis; climate change
Walter Andrea, Lüthi Martin P., Vieli Andreas (2020), Calving event size measurements and statistics of Eqip Sermia, Greenland, from terrestrial radar interferometry, in The Cryosphere
, 14(3), 1051-1066.
Mercenier Remy, Lüthi Martin, Vieli Andreas (2020), How Oceanic Melt Controls Tidewater Glacier Evolution, in Geophysical Research Letters
Jouvet Guillaume, Weidmann Yvo, Van Dongen Eef, Luthi Martin P., Vieli Andreas, Ryan Jonathan P. (2020), High-endurance UAV for monitoring calving glaciers: Application to the Inglefield Bredning and Eqip Sermia, Greenland, in Frontiers in Earth Science, section Cryospheric Sciences
, MS 472718.
Jouvet Guillaume, van Dongen Eef, Lüthi Martin P., Vieli Andreas (2019), In-situ measurements of the ice flow motion at Eqip Sermia Glacier using a remotely controlled UAV, in Geoscientific Instrumentation, Methods and Data Systems Discussions
Mercenier Remy, Lüthi Martin, Vieli Andreas (2019), A transient coupled ice flow-damage model to simulate iceberg calving from tidewater outlet glaciers, in Journal of Advances in Modeling Earth Systems
, 11, 1-16.
Rohner Christoph, Small David, Henk Daniel, Lüthi Martin P, Vieli Andreas (2019), Multisensor validation of tidewater glacier flow fields derived from SAR intensity tracking, in The Cryosphere
Lüthi Martin Peter (2019), Stream Gauge Calibration of a Cave Stream Using Water Temperature Variability as a Tracer, in Water Resources Research
, 55, 1-13.
Mercenier R., Lüthi M. P., Vieli A. (2018), Calving relation for tidewater glaciers based on detailed stress field analysis, in The Cryosphere
, 12(2), 721-739.
Lüthi Martin P., Vieli Andreas, Moreau Luc, Joughin Ian, Reisser Moritz, Small David, Stober Manfred (2016), A century of geometry and velocity evolution at Eqip Sermia, West Greenland, in Journal of Glaciology
Lüthi Martin P., Vieli Andreas (2016), Multi-method observation and analysis of a tsunami caused by glacier calving, in The Cyrosphere
, 10, 995-1002.
This project aims at understanding and modeling the short- and long-termcalving dynamics of an outlet glacier draining the Greenland Ice Sheet (GrIS)and validating the approach with records of its long-term evolution (> 100years). We will complement historical data with short-term in situ andremote-sensing observations to feed into a numerical modeling study targetedat identifying the key processes leading to iceberg calving, and implementingfracture and damage based methods for simulating the evolution of suchglaciers. A simultaneous remote-sensing study will use new Sentinel radarsatellite data and recent developments in object-tracking methods to deriveglacier-wide flow fields at high spatial and temporal resolution. The target glacier is Eqip Sermia on the Greenland West coast. This glacier has doubled its discharge within the last decade, and recently started to accelerate and retreat at high rate after a century of slow retreat and stable flow speed. With some delay, this glacier follows the general trend of neighboring larger outlet glaciers of the GrIS. Eqip Sermia glacier has one of the best documented histories of all Greenland glaciers, with surveys of geometry and velocity starting in 1912. The current rapid retreat into a deeper basin is unique in the glacier's documented history and is very likely irreversible under current climate conditions.Dynamic changes in such ocean-terminating outlet glaciers are responsible forabout half of the current high rate of mass loss of the GrIS. The relatedcalving process, by which ice is lost to the ocean, is still not wellunderstood and poorly represented in current generation ice-sheet models, butis a crucial requisite to understand and model dynamics and future mass lossof the ice sheet. Current calving modeling approaches are mostly empirical orlack a dynamic treatment, but it is becoming increasingly clear that calvingis a process emerging from a material fatigue and fracturing processes.We propose a novel approach of transient modeling of calving based on fractureand damage mechanics. The numerical modeling will bring together the physicsof individual ice failure and calving events to provide fracture and damagerelations that can be applied to larger-scale ice flow models. This task willbe supported by ground-based, high rate interferometric radar, and hightemporal resolution satellite-radar measurements of ice geometry and motion,intermediate resolution time-lapse photography, and for validation purposes bythe long-term (100 years) history of terminus positions and ice flowvelocities.Ultimately, this project will provide (i) relations based on damage andfracture mechanics to model individual calving events, (ii) a methodology forextraction of glacier displacements from multi-orbit radar-imagery at highresolution sub repeat-cycle time-scales, and (iii) a robust, physically based,and empirically validated treatment of glacier calving for the use inlarge-scale ice flow models.