DEVELOPMENT OF MONITOR SYSTEM OF GRAVEL ADHESION ALGAE THAT USE REFLECTED SPECTRUM AND DIGITAL IMAGE

Abstract

To improve the riverbed environment, the sediment sand discharge to the downstream of dam and the putting sand are done. Because a long term is required for this effect to become visible, it is necessary to monitor a long term. In addition, it is necessary to monitor the appearance of the renewal of algae due to the flood.

In the present study, the correlativity between the activation level of the chlorophyll of the gravel adhesion algae and the reflected spectrum were applied. The correlativity of a reflection spectrum characteristic and a digital number from the gravel adhesion algae was clarified, and the existence of the correlativity with the amount of the chlorophyll was able to be clarified.

The corresponding value to a digital number in the surface of the water and the correlation of the amount of the chlorophyll were examined, and it was able to propose a practicable estimated equation.