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Most widely used integrated hydrologic models use outdated descriptions of the stream-aquifer flow exchange. Understandably they do it for practical reasons to avoid computational costs in large-scale regional studies. In this article we propose a largely analytical technique that (1) describes the situation when the connection is unsaturated while avoiding a lot of numerical work and at the same time remains quite physical, (2) has the capability to describe fluctuations between saturated and unsaturated connections, and (3) can be coupled easily with the numerical groundwater model that describes what happens in the broad system of cells away from the river(s). Essentially two separate methods are compared for the purpose of selecting the most practical of the two.
Morel-Seytoux HJ, Miller C, Mehl S, Miracapillo C. Achilles’ heel of integrated hydrologic models: The stream-aquifer flow exchange and proposed alternative. Journal of Hydrology. 2018;564:900-908.
Morel-Seytoux HJ. MODFLOW’s River package: Part 1: A critique. Physical Science International Journal. 2019a;22(2): 1-9. Article no.PSIJ.49757
Morel-Seytoux HJ, Calvin D. Miller, Cinzia Miracapillo, Steffen Mehl. River seepage conductance in large-scale regional studies. ©2016, National Ground Water Association; 2016.
Morel-Seytoux HJ. Two dimensional analytical derivation of incipient desaturation criterion in stream-aquifer flow exchange. Journal of Geography, Environment and Earth Science. 2019d;23(4):1-14.
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Morel-Seytoux HJ. Analytical River routing with alternative methods to estimate seepage. International Journal of Environment and Climate Change. 2019b;9(3):167-192.