Simulating the influence of two shallow, flow-through lakes on a groundwater system: implications for groundwater mounds and hinge lines |
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| Authors: | David C Gosselin Mohan J Khisty |
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| Institution: | (1) Conservation and Survey Division and School of Natural Resource Sciences, Institute of Agriculture and Natural Resources, University of Nebraska-Lincoln, Lincoln, Nebraska 68588–0517, USA,;(2) 108 Rosebud Ln, Georgetown, Texas 78628, USA, |
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| Abstract: | Groundwater mounds and hinge lines are important features related to the interaction of groundwater and lakes. In contrast
to the transient formation of groundwater mounds, numerical simulations indicate that permanent groundwater mounds form between
closely spaced lakes as the natural consequence of adding two net sinks to a groundwater flow system. The location of the
groundwater mound and the position of the hinge lines between the two lakes are intimately related. As the position of the
mound changes there is a corresponding shift in the position of the hinge line. This results in a change in the ratio of groundwater
inflow to outflow (Qi/Qo) for the lake. The response of the lake is an increase or decrease in the lake level. Our simulations indicate that the movement
of the hinge line in a natural system is a consequence of the dynamic interrelationships between recharge, the slope of the
water table upgradient and downgradient of the lake, and the loss of water from the lake by evaporation. The extent of the
seasonal movement of the hinge line will vary from one year to the next depending on local changes in the magnitude of the
hydrologic variables.
Electronic Publication |
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| Keywords: | groundwater/surface-water relations water-table mounds hinge lines lake hydrogeology numerical modeling |
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