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1 2005

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Tracer test in Hobol Creek, Norway, under different flow conditions

Wörman A., Klove B., Wachniew P., Czupryński P., Packman A.

Acta Geophysica Polonica

2005

Vol. 53, nr 4

517-526

The current paper describes a repetition of a tracer test using tritiated water in Hobol Creek, Norway, under two markedly different flow conditions in August and in October 2002. By carefully fitting a one-dimensional model of the solute trans-port in the creek, various mixing parameters could be evaluated and compared be-tween the two occasions. The change in residence time in and exchange rate with the hyporheic zone caused by the difference in flow could be well accounted for in terms of the "pumping" theory. The pumping theory represents the hydro-mechanics of the exchange flow. Further, we found that at least 70% mass recovery is needed to provide an accurate evaluation of model parameters and this can only be achieved up to a limited stream distance.