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The Effect of Time-Step Length in Modeling River and Aquifer InteractionBy Shiva Niazi, Randal Charbeneau, and David Maidment ABSTRACT In modeling groundwater and surface water systems simultaneously, the
issue of time-step length becomes paramount due to the difference in
residence times of rivers and aquifers. To determine the effect of time-step
length in modeling river and aquifer systems, a MODFLOW groundwater
model of Milam, Lee and Bastrop counties was dynamically linked to a
model of the Colorado River. In a dynamic link between separate surface
water and groundwater models, the output of one model is used to update
the input of the other model in a cyclic fashion. In this scenario,
time-step length is redefined as the length of time each model is allowed
to run before updating the other model. A series of 32-day flood wave
simulations were performed to determine the effect of averaging a highly
fluctuating river discharge over progressively longer time-steps. The
preliminary results of this study suggest that time-step affects the
quantity of water that the model predicts is exchanged between the river
and aquifer. However, these results were neither validated with another
coupled river and aquifer modeling system nor with field data gathered
from groundwater wells near the river The highlighted links that follow are connected to Adobe pdf files of the corresponding material. To view them you must have the Adobe Acrobat Reader 3.0. View the Report...(2.4MB)
These materials may be used for study, research, and education, but please credit the authors and the Center for Research in Water Resources, The University of Texas at Austin. All commercial rights reserved. Copyright 2000 Center for Research in Water Resources.
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