COMPARISON OF THE IMPROVEMENT EFFECT OF VARIOUS SAND CAPPING MATERIALS ON THE BOTTOM WATER OXYGEN CONCENTRATION

Abstract

 Comparisons of the improvement effect of various sand capping materials on the dissolved oxygen (DO) consumption rate in water were investigated by laboratory experiment. For the study, intact sediment cores were collected using acrylic tubes in Shinshiba Canal in Tokyo Bay, and capped the sediments by various sand materials. We estimated the DO consumption rate for 9 different conditions of sand capping materials. From the study, results were obtained that the DO consumption rate was small for shirasu (volcanic ash) and coal ash granule, and the rate was smaller for fine materials than for coarse materials.