THE EXPERIMENTAL STUDY OF THE SCALE EFFECT ON DISPERSION USING A LONG SOIL CHANNEL

Abstract

A series of one-dimensional tracer experiments were carried out in a 20 m long homogeneous sand media to see the scale effect on dispersion. Dispersivity was found increasing with distance. This may be due to the segregation of the smaller sized sand and larger sized sand particles in micro scale. Similar experiments in a 10 m long heterogeneous media, prepared by inserting a number of large permeable blocks into the previous sand media, also showed the similar behavior. However, the rate of increase of the dispersivity is smaller in heterogeneous media.