Browsing Department of Mathematics by Author "Mannseth, Trond"
Now showing items 1-7 of 7
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Assessing Model Uncertainties Through Proper Experimental Design
Hvidevold, Hilde Kristine; Alendal, Guttorm; Johannessen, Truls; Mannseth, Trond (Peer reviewed; Journal article, 2013)This paper assesses how parameter uncertainties in the model for rise velocity of CO2 droplets in the ocean cause uncertainties in their rise and dissolution in marine waters. The parameter uncertainties in the rise velocity ... -
Feasibility of simplified integral equation modeling of low-frequency marine CSEM with a resistive target
Bakr, Shaaban Ali; Mannseth, Trond (Peer reviewed; Journal article, 2009)We have assessed the accuracy of a simplified integral equation (SIE) modeling approach for marine controlledsource electromagnetics (CSEM) with low applied frequencies and a resistive target. The most computationally ... -
Identification of subsurface structures using electromagnetic data and shape priors
Tveit, Svenn; Bakr, Shaaban A.; Lien, Martha; Mannseth, Trond (Journal article, 2015-03)We consider the inverse problem of identifying large-scale subsurface structures using the controlled source electromagnetic method. To identify structures in the subsurface where the contrast in electric conductivity can ... -
Layout of CCS monitoring infrastructure with highest probability of detecting a footprint of a CO2 leak in a varying marine environment
Hvidevold, Hilde Kristine; Alendal, Guttorm; Johannessen, Truls; Ali, Alfatih Omer Mohammed Ahmed; Mannseth, Trond; Avlesen, Helge (Peer reviewed; Journal article, 2015-04-04)Monitoring of the marine environment for indications of a leak, or precursors of a leak, will be an intrinsic part of any subsea CO2 storage projects. A real challenge will be quantification of the probability of a given ... -
Permeability estimation with the Augmented Lagrangian method for a nonlinear diffusion equation.
Nilssen, Trygve K.; Mannseth, Trond; Tai, Xue-Cheng (Department of Applied Mathematics report, Research report, 2001-01) -
Sampling error distribution for the ensemble Kalman filter update step
Kovalenko, Andrey; Mannseth, Trond; Nævdal, Geir (Peer reviewed; Journal article, 2011-07-06)In recent years, data assimilation techniques have been applied to an increasingly wider specter of problems. Monte Carlo variants of the Kalman filter, in particular, the ensemble Kalman filter (EnKF), have gained significant ... -
A Study of the Modelling Error in two Operator Splitting Algorithms for porous Media Flow
Brusdal, Kari; Dahle, Helge K.; Karlsen, Kenneth Hvistendahl; Mannseth, Trond (Department of Applied Mathematics report, Research report, 1997-10)