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1 Acta Geophysica Polonica

1 2005

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A residence time model for stream-subsurface exchange of contaminants

Marion A., Zaramella M.

Acta Geophysica Polonica

2005

Vol. 53, nr 4

527-538

Stream-subsurface exchange of substances has received increasing attention in past two decades. This growing interest is the result of an interdisciplinary approach to environmental problems, where very different expertises must come together to face modern challenges. The importance of the hyporheic zone in the ecological evolution of a natural river has been assessed in many ways. The role of hydraulic engineering in this field is to develop modelling tools capable of estimating the fate of the contaminants after they reach the river. The fate of contaminants depends on complex interactions between the fluid and the substances, hydrodynamics being a key factor. A few models have been proposed in the literature. Some of them are lacking solid physical basis, some others have never been applied to field cases. A new conceptual model is presented here, which is thought to optimize the input of data from field tracer tests on a sound physical basis. The potential of the model is described by the application to a major Israeli river, where the expected contamination of the upper part of the hyporheic zone has been estimated.