112 results found
Collins GS, Morgan J, Barton P, et al., 2008, Dynamic modeling suggests terrace zone asymmetry in the Chicxulub crater is caused by target heterogeneity, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 270, Pages: 221-230, ISSN: 0012-821X
Davison TM, Collins GS, Ciesla FJ, 2008, Numerical modelling of shock heating in porous planetesmial collisions, Workshop on Antarctic Meteorites - Search, Recovery, and Classification, Publisher: METEORITICAL SOC, Pages: A36-A36, ISSN: 1086-9379
Ham DA, Farrell PE, Gorman GJ, et al., 2008, Spud 1.0: generalising and automating the user interfaces of scientific computer models, GEOSCI MODEL DEV, Vol: 1, Pages: 125-146, ISSN: 1991-959X
The interfaces by which users specify the scenarios to be simulated by scientific computer models are frequently primitive, under-documented and ad-hoc text files which make using the model in question difficult and error-prone and significantly increase the development cost of the model. In this paper, we present a model-independent system, Spud, which formalises the specification of model input formats in terms of formal grammars. This is combined with an automated graphical user interface which guides users to create valid model inputs based on the grammar provided, and a generic options reading module which minimises the development cost of adding model options.Together, this provides a user friendly, well documented, self validating user interface which is applicable to a wide range of scientific models and which minimises the developer input required to maintain and extend the model interface.
Osinski GR, Grieve RAF, Collins GS, et al., 2008, The effect of target lithology on the products of impact melting, METEORITICS & PLANETARY SCIENCE, Vol: 43, Pages: 1939-1954, ISSN: 1086-9379
Pierazzo E, Artemieva N, Asphaug E, et al., 2008, Validation of numerical codes for impact and explosion cratering: Impacts on strengthless and metal targets, METEORITICS & PLANETARY SCIENCE, Vol: 43, Pages: 1917-1938, ISSN: 1086-9379
Wuennemann K, Collins GS, Osinski GR, 2008, Numerical modelling of impact melt production in porous rocks, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 269, Pages: 529-538, ISSN: 0012-821X
Bland PA, Artemieva NA, Bussey DBJ, et al., 2007, Survival of asteroidal impactor material on the moon, 70th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A19-A19, ISSN: 1086-9379
Davison T, Collins GS, 2007, The effect of the oceans on the terrestrial crater size-frequency distribution: Insight from numerical modeling, METEORITICS & PLANETARY SCIENCE, Vol: 42, Pages: 1915-1927, ISSN: 1086-9379
Goldin TJ, Wuennemann K, Melosh HJ, et al., 2006, Hydrocode modeling of the Sierra Madera impact structure, METEORITICS & PLANETARY SCIENCE, Vol: 41, Pages: 1947-1958, ISSN: 1086-9379
Wunnemann K, Collins GS, Melosh HJ, 2006, A strain-based porosity model for use in hydrocode simulations of impacts and implications for transient crater growth in porous targets, ICARUS, Vol: 180, Pages: 514-527, ISSN: 0019-1035
Collins GS, Melosh HJ, Marcus RA, 2005, Earth Impact Effects Program: A Web-based computer program for calculating the regional environmental consequences of a meteoroid impact on Earth, Meteoritics & Planetary Science, Vol: 40, Pages: 817-840, ISSN: 1086-9379
Collins GS, Wunnemann K, 2005, How big was the Chesapeake Bay impact? Insight from numerical modeling, GEOLOGY, Vol: 33, Pages: 925-928, ISSN: 0091-7613
Melosh HJ, Collins GS, 2005, Meteor Crater formed by low-velocity impact - The paucity of melted rock in this crater may be due to the striking projectile's speed, NATURE, Vol: 434, Pages: 157-157, ISSN: 0028-0836
Turtle EP, Pierazzo E, Collins GS, et al., 2005, Impact structures: what does crater diameter mean?, Large Meteorite Impacts III, Editors: Kenkmann, Horz, Deutsch, Kenkmann, Horz, Deutsch, Boulder CO, Publisher: Geological Society of America, Pages: 1-24, ISBN: 9780813723846
Collins GS, Melosh HJ, Ivanov BA, 2004, Modeling damage and deformation in impact simulations, METEORITICS & PLANETARY SCIENCE, Vol: 39, Pages: 217-231, ISSN: 1086-9379
Pierazzo E, Collins G, 2004, A brief introduction to hydrocode modeling of impact cratering, Editors: Dypvik, Burchell, Claeys, Publisher: SPRINGER-VERLAG BERLIN, Pages: 323-340, ISBN: 3-540-40668-9
Collins GS, Melosh HJ, 2003, Acoustic fluidization and the extraordinary mobility of sturzstroms, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 108, ISSN: 2169-9313
Collins GS, Melosh HJ, Morgan JV, et al., 2002, Hydrocode Simulations of Chicxulub crater collapse and peak-ring formation, ICARUS, Vol: 157, Pages: 24-33, ISSN: 0019-1035
Morgan JV, Warner MR, Collins GS, et al., 2000, Peak-ring formation in large impact craters: geophysical constraints from Chicxulub, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 183, Pages: 347-354, ISSN: 0012-821X
Davison TM, Derrick JG, Collins GS, et al., Impact-induced compaction of primitive solar system solids: The need for mesoscale modelling and experiments, Procedia Engineering, ISSN: 1877-7058
Primitive solar system solids were accreted as highly porous bimodal mixtures of mm-sized chondrules and sub-μm matrix grains. To understand the compaction and lithification of these materials by shock, it is necessary to investigate the process at the mesoscale; i.e., the scale of individual chondrules. Here we document simulations of hypervelocity compaction of primitive materials using the iSALE shock physics model. We compare the numerical methods employed here with shock compaction experiments involving bimodal mixtures of glass beads and silica powder and find good agreement in bulk material response between the experiments and models. The heterogeneous response to shock of bimodal porous mixtures with a composition more appropriate for primitive solids was subsequently investigated: strong temperature dichotomies between the chondrules and matrix were observed (non-porous chondrules remained largely cold, while the porous matrix saw temperature increases of 100’s K). Matrix compaction was heterogeneous, and post-shock porosity was found to be lower on the lee-side of chondrules. The strain in the matrix was shown to be higher near the chondrule rims, in agreement with observations from meteorites. Chondrule flattening in the direction of the shock increases with increasing impact velocity, with flattened chondrules oriented with their semi-minor axis parallel to the shock direction.
Hill J, Avdis A, Mouradian S, et al., Was Doggerland catastrophically flooded by the Mesolithic Storegga tsunami?
Myths and legends across the world contain many stories of deluges andfloods. Some of these have been attributed to tsunami events. Doggerland in thesouthern North Sea is a submerged landscape thought to have been heavilyaffected by a tsunami such that it was abandoned by Mesolithic humanpopulations at the time of the event. The tsunami was generated by the Storeggasubmarine landslide off the Norwegian coast which failed around 8150 years ago.At this time there were also rapid changes in sea level associated withdeglaciation of the Laurentide ice sheet and drainage of its large proglaciallakes, with the largest sea level jumps occurring just prior to the Storeggaevent. The tsunami affected a large area of the North Atlantic leavingsedimentary deposits across the region, from Greenland, through the Faroes, theUK, Norway and Denmark. From these sediments, run-up heights of up to 20 metreshave been estimated in the Shetland Isles and several metres on mainlandScotland. However, sediments are not preserved everywhere and so reconstructinghow the tsunami propagated across the North Atlantic before inundating thelandscape must be performed using numerical models. These models can also beused to recreate the tsunami interactions with now submerged landscapes, suchas Doggerland. Here, the Storegga submarine slide is simulated, generating atsunami which is then propagated across the North Atlantic and used toreconstruct the inundation on the Shetlands, Moray Firth and Doggerland. Theuncertainty in reconstructing palaeobathymetry and the Storegga slide itselfresults in lower inundation levels than the sediment deposits suggest. Despitethese uncertainties, these results suggest Doggerland was not as severelyaffected as previous studies implied. It is suggested therefore that theabandonment of Doggerland was primarily caused by rapid sea level rise prior tothe tsunami event.
Holm-Alwmark S, Rae A, Ferriere L, et al., Combining shock barometry with numerical modeling: insights into complex crater formation – The example of the Siljan impact structure (Sweden), Meteoritics and Planetary Science, ISSN: 1086-9379
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