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Simulating the influence of two shallow, flow-through lakes on a groundwater system: implications for groundwater mounds and hinge lines

Content Provider	Springer Nature Link
Author	Gosselin, David C. Khisty, Mohan J.
Copyright Year	2001
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 (Q$_{i}$/Q$_{o}$) 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. Les dômes et les lignes piézométriques d'articulation sont des phénomènes importants en ce qui concerne les interactions entre les nappes et les lacs. En contradiction avec la formation transitoire de nappe, les simulations numériques indiquent que des dômes piézométriques se forment entre des lacs très proches, comme une conséquence naturelle de l'addition de deux écoulements nets du système aquifère. La localisation du dôme piézométrique et la position des lignes d'articulation entre les deux lacs sont intimement liés. Comme la position du dôme change, il se produit un déplacement consécutif des lignes. Ceci résulte d'un changement du rapport entre l'entrée et la sortie d'eau souterraine (Q$_{i}$/Q$_{o}$) pour le lac. La réponse du lac est une remontée ou une descente de son niveau. Nos simulations indiquent que le mouvement de la ligne de crête dans le système naturel est une conséquence des relations dynamiques entre la recharge, la pente de la surface de la nappe en amont et en aval du lac, et la perte d'eau à la surface du lac par évaporation. L'étendue du mouvement saisonnier des lignes varie d'une année à l'autre en fonction des variations locales des valeurs des variables hydrologiques. Los domos de aguas subterráneas y las charnelas son características importantes en cuanto a la interacción entre aguas subterráneas y lagos. Contrariamente a la formación transitoria de las aguas subterráneas, las simulaciones numéricas efectuadas indican que se forman domos permanentes de aguas subterráneas entre lagos cercanos, como consecuencia de la existencia de dos sumideros en el sistema de flujo subterráneo. La situación de dichos domos y la posición de la divisoria de aguas entre los dos lagos están íntimamente relacionadas. Conforme la posición del domo cambia, se experimenta un desplazamiento en la divisoria de aguas. Esto resulta en la modificación del cociente entre la entrada y la salida de aguas subterráneas (Q$_{i}$/Q$_{o}$) hacia y desde el lago, hecho que se manifiesta en el aumento o disminución del nivel de agua en el lago. Nuestras simulaciones indican que el movimiento de la divisoria de aguas en un sistema natural es debido a las interrelaciones dinámicas entre la recarga, la pendiente del nivel freático aguas arriba y aguas abajo del lago, y la pérdida de agua del lago por evaporación. El alcance del movimiento estacional de la divisoria de aguas variará de un año a otro, en función de cambios locales en la magnitud de las variables hidrológicas.
Starting Page	476
Ending Page	486
Page Count	11
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	9
Issue Number	5
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-07-03
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Hydrology/Water Resources Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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