|
| |
|
| |
|
|
Nonlinear rheological models and dynamic processes in the Earth interior
Ulvrová, Martina ; Čížková, Hana (advisor) ; Matyska, Ctirad (referee)
Nu/ev prace: Nelinrarni n-olujMcke niodely: popis dynamickych procesu v xeni- skem nitru Autor: Martina Ulvrova. Katedra (ustav): Katedra geofyziky Vedouei bakalafskc prace: Mgr. Ha.na C'i/kova,. Ur. e-mail vedouciho: hk:(lkarel.1roja.niff.euni.c/ Abslrakt: V pfedlo/,ene praci studujeme uelineanii visko/ni reolojncky popis, ktery je tiYba uva/ovat \ni numi'i'iekem inodelova.ni j)rc)cesu litostericke subdukee. Na.s kompo/,itm' model xaliriiujf tfi tlelbrmacni ineehani'/mv: linearni ncwtonov- ske tcreiii. mocliimiy dislokaeni creep a neliiic'avii] Peieiisovo tectini. Pro nV/ne hlou!)ky a velikowti zrn ukazii)eme, Jake i'eolo^it:ke iiKx-liani/niy so nplatnnji xa. danyeh te])lotnich, tlakovych a uajjelovyeli pudiniiu'k od])ovida jieii-li ru/nym ob~ last.em ])lasle. Dale tento reoloj^icky popis a.plikujemc na model piedpokladanelio ro/lozeni teploty a nap(Hi v snbdukovane desce a diskuUijeme, ja.k se jedinitlive mechani/uiy podileji na defbrmaci desky. Klicova slova: snlxlukce liiosiery; rrolo^ie; dcformarni mapy Title: Nonlinear rheological models: Description of dynamic processes in the Earth 's interior Author: Martina Ulvrova Department: Dejjartment of geophysis Supervisor: M^r. liana Oi/kova, Dr. Supervisor's e-mail address: Abstract: In the present work we study nonlinear viscous rhrolov that should be...
|
|
| |
|
| |
|
| |
|
|
Dynamic models of earthquake source and modeling of seismicity
Kostka, Filip ; Gallovič, František (advisor) ; Matyska, Ctirad (referee)
In the present thesis we perform modeling of earthquake source using laboratory derive rate-and-state laws of friction. We have developed a code in Fortran 90 for modeling a planar, two-dimensional fault with general dip and heterogeneous distribution of frictional parameters. We use a quasi-dynamic approximation and assume that the fault is submnerged in an infinite elastic half-space. We performed an extensive number of numerical experiments to study the effect of fricitonal parameters distribution on the spatio-temporal complexity of slip on fault. We also study the effect of the so called Coulomb stress changed on clock advance and clock delay of events. For this purpose we use both a homogeneous model and a model of random frictional parameteres which exhibits the Gutenberg-Richter frequency- size dependence in the range of two magnitudes. We find that the effect of Couloumb stress change is nontrivial and depends on factors such as the domain of stress load and the slip velocity on it. Powered by TCPDF (www.tcpdf.org)
|
|
|
Time-domain modelling of global barotropic ocean tides
Einšpigel, David ; Martinec, Zdeněk (advisor) ; Haagmans, Roger (referee) ; Matyska, Ctirad (referee)
Traditionally, ocean tides have been modelled in frequency domain with forcing of selected tidal constituents. It is a natural approach, however, non-linearities of ocean dynamics are implicitly neglected. An alternative approach is time-domain modelling with forcing given by the full lunisolar potential, i.e., all tidal constituents are included. This approach has been applied in several ocean tide models, however, a few challenging tasks still remain to solve, for example, the assimilation of satellite altimetry data. In this thesis, we present DEBOT, a global and time-domain barotropic ocean tide model with the full lunisolar forcing. DEBOT has been developed "from scratch". The model is based on the shallow water equations which are newly derived in geographical (spherical) coordinates. The derivation includes the boundary conditions and the Reynolds tensor in a physically consistent form. The numerical model employs finite differences in space and a generalized forward-backward scheme in time. The validity of the code is demonstrated by the tests based on integral invariants. DEBOT has two modes for ocean tide modelling: DEBOT-h, a purely hydrodynamical mode, and DEBOT-a, an assimilative mode. We introduce the assimilative scheme applicable in a time-domain model, which is an alternative to existing...
|
|
|
Historical development of the concept on the figure of the Earth
Procházková, Pavla ; Novotný, Oldřich (advisor) ; Matyska, Ctirad (referee)
Nazcv pnicc: I listoricky vyvoj mizoru na tvar /erne Autorka: Pavla Procha/kova Katedra (iista\): Katedra goofy/iky Vcdnuci diplomove pnicc: doc. RNDr. Oldfich Novotny. CSe. e-mail vctluuciho: otvi/ karel.lroja.mfV.cuni.c/ Abstrakt: Tato pracc jc zamefena mi vyvoj na/oru na ivar Xeme od prvnich starovekyeh pfedslav a/ po moderni nicfici melody. Soucasti jsou i odvo/cni tihoveho potencialu pro /cmi jako homogcnni rotujici kouli ti /cmi Ivaru slcroidu. Clenaf sc do/\ /akladni inlbrmace o mcncich metodach tvaru Xeme. kterc lidstvo postupnc pou/ivalo. Pracc /arovcn slcdujc, jak vyslcdky icchlo mclod ovlivnily nazor na tvar Xemc. Prvni vcdccka mcreni /apocala ji/ \'c 2. slolcli pf.n.L, kdv l^ratoslhcnes provedI prvni stupnova mOf'eni. Dalsfni diilc/ilyni krokem byI ohjev triangulacc a naslcdne dalckohlcdu, klcry umo/nil merit do velke v/dalenosti. I\isledm'm velkym /loinovym okam/ikcni v Icchlo mcrcnich by] ro/voj Iclii do vesmi'ru a satcMlnich inei'cni. V poslcdm'ch desclilcti'cli docha/i k sirokemu v\u7.iti tcchlo mclod ve vede a v praxi diky novym presnym melodam mcfx-ni velkych v/dalenosti pomoci laseru. V /averu prace jsou uvedeny niznc druln dues pouzivanych nadmofskych vysck a xpiisoby jejich mcreni. Klicovii slova: ivar Xeme. hisloricky pi'ehled. gcoid. sleroid. dru/icove melody Title: 1lislorical...
|
|
|
Vliv materiálových parametrů na stabilitu termální konvekce
Dostalík, Mark ; Matyska, Ctirad (advisor) ; Klika, Václav (referee)
The thesis is focused on the investigation of Rayleigh-Bénard problem in an extended setting approximating the conditions in the Earth's mantle. The aim is to evaluate the influence of depth- and temperature- dependent material parameters, dissipation, adiabatic heating/cooling and heat sources on the qualitative characteristics of thermal convection. We identify the critical values of dimensionless parameters that determine the onset of convection and characterize the dominating convection patterns in marginally supercritical states. These issues are addressed by the application of linear stability analysis and weakly non-linear analysis. It has been found that the character of convection differ substantially from the standard case of Rayleigh-Bénard convection. Powered by TCPDF (www.tcpdf.org)
|
guest ::
