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Summary
A simple apparatus is described for the inclusion of artificial substrates in small streams and the study of the hyporheic environment. The device consists in two hardening steel units which are sunk with an electric vibrator into the bed of a small river at a depth of 85 cm below the surface of the sediments; when the borer is in place, the internal tube is removed, the artificial substrate is then set in the hole limited by the external unit which is finally removed.
The time required for boring and setting up the artificial substrate varies between fifteen and thirty minutes, according to the heterogeneity of the sediments. The method is simple, inexpensive and does not disturb the environment.
The first results obtained on the Bourbre show that a stratification of the river sediments exists beyond the first 10 cm usually explored.