FUNCTIONAL ESTIMATION ON ISHIDOMO OF SHIRAKAWA RIVER CONSTRUCTED IN EDO PERIOD

Abstract

In Kumamoto Prefecture, there are many flood protection and water utilization works as diversion structures, levees and groins made of stones which were constructed by Kiyomasa Kato as a feudal lord in the early Edo era. However, most works have not been clarified with actual evidence as to how they play a role in flood protection. In this paper, Ishidomo of the Shirakawa river, which was pointed out as masonry separation levee for flood protection works, has been investigated from the viewpoint of historical river regulation methods by applying a hydraulic model to Ishidomo with culvert or overflow spill way . The model scale was 1/250. In addition, abandoned path of the Shirakawa River were identified by topographical information analysis based on laser profiler data and old map in Edo era.