Abstract
To estimate condition of river ecosystem in past, we developed a system which quantitatively reconstruct physical environment information and river flooding condition. The system have characteristic which reconstruct river morphology and flooding condition from topographic map and measurement of river channel morphology, using Geographic information System (GIS), image analysis and numerical simulation. The water lever of river flood condition in 1892 which is reconstructed by the system matched with the result of water level recorded in past document. The result indicated the efficiency and possibility of the system in river ecosystem restoration project.
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