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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.

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Gradients in Multi-Layer Models

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  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

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