1 / 22

Gradients in Multi-Layer Models

This document discusses the findings on gradients in multi-layer models, specifically looking at gradients in the eastern and central model. The conclusions highlight that most gradients are small, with few cells having gradients of more than 2 feet from bottom to top. The presence of downward gradients in strong recharge areas and upward gradients in discharge areas are also noted.

thomasangel
Télécharger la présentation

Gradients in Multi-Layer Models

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Gradients in Multi-Layer Models Prepared for consideration by COHYST Technical Committee, August 22, 2008 (For Internal Use Only)

  2. Introduction • At July 2008 COHYST Technical Committee meeting, committee started to talk about model layers for future models • Duane Woodward assigned Dick Luckey to look at gradients in eastern and central model to help with discussions about layers • Looked at gradients between lowest model layer and highest active model layer

  3. Introduction (continued) • Found that being too aggressive with time steps and solvers resulted in upper layer being disconnected from lower layer – told me to be very careful. Did not occur in results presented here • GMS was ornery in this analysis, but work a-rounds exist

  4. Dick’s Conclusions • Most gradients are small, and few cells have gradients of more than 2 feet from bottom to top • Downward gradients exist in strong recharge areas (i.e. below canals and reservoirs) • Upward gradients exist in discharge areas (some with special conditions, such as low streambed conductance) • Gradients have little to do with hydrostratigraphic units • More than two model layers, plus non-storing confining layer between then are not justified

More Related