SAND COLOR CHARACTERISTINCS IN THE BIWA LAKE SHORE BEACH AND RELATIONSHIP BETWEEN THE CHARACTERISTICS AND GEOLOGICAL FEATURES OF SURROUNDING DRAINAGE AREAS

Abstract

 Beach sand were collected in selected 27 beaches in the Biwa Lake shore and in 14 rivers which flow into the Lake, to examine supply sources of the beach sand. Sand colors were analyzed using the simple color analyzing method proposed in our preceding papers. Rrelationships between the sand colors and geological stratums around the lake were investigated and it is comfirmed that sand colors of the beaches were obviously depend on the geological stratums. Color relationships between the beach sand and the river sand were examined using a simple optimization analysis.