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Unformatted text preview: How would you choose between constructing a fully or quasi-3D model? 3.3 Laying out the grid What is the difference between a block- and a mesh-centered grid? Which type is MODFLOW? How do finite-element meshes differ from finite-difference grids? Model layers can be selected to represent hydrostratigraphic units (Fig 3.13 and Fig 3.14) or can cross layers (Fig 3.16). What are the pros and cons of each way? How are “pinch outs” represented in quasi and fully 3D models? How can you minimize the number of inactive nodes in a finite-difference model? What are some considerations for deciding on the extent of your model (defining your model boundaries)? Why is nodal spacing important? What are the advantages and disadvantages on refining the grid in certain areas? What inaccuracy is introduced by an irregular grid? What is the rule of thumb for changing the grid spacing? What is telescopic mesh refinement?...
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- Fall '11
- Grid Computing, 3D computer graphics, fully 3d models