Author(s)

T. Yamamoto, M Takezawa & Y Maeno

Abstract

In the initial stage of land reclamation, sand is dumped into the sea from hopper barges. For construction management to estimate the total amount of sand for completion of reclamation requires knowledge of the sedimentation process and the area affected by scattered sand in order to consider the environmental impact. The present paper experimentally estimates the scattering range of dumped sand. The dispersion of sand both in still water and in jet flow of water was investigated via modeling experiments. The primary conclusions of the present study are as follows. The critical velocity of jet flow at which sand on the sea bottom began to transfer, was 28 cdsec-3 1 cm/sec regardless of sand grain size. The dispersion width of sand on the sedimentation path was in inversely proportional to the settling velocity. 1 Introduc

Keywords