SIGNATURE OF HUMAN-CAUSED ALTERATIONS OF IN-STREAM THERMAL ENVIRONMENT

摘要

This study investigates characteristics of water temperature variations in the middle reaches of the Shinano River. Attention is given to the impact of a hydropower plant on downstream water temperature daily regime. Peculiar diurnal variation of water temperature appears immediately downstream of the power plant. At a different site, 17 km downstream of the power plant, thermal anomaly manifests in a different form that is designated herein as in-stream tropic night.