河床縦断形のシミュレーション(<特集>数値地形図の技術と応用)

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In this study, longitudinal river profile changes were simulated using the basic equation for topographic changes by Nogami (1981). For improving the material transportation efficiency of rivers, we used an algorithm for sending material in excess of the river transportation capacity to the river mouth when a given gradient was maintained. From the above, it was confirmed that simplified simulation of the longitudinal variation showed effective material transportation and concave shape of the riverbed as seen in nature. Next, along the Hiyoshi River of the Gifu Prefecture, simulation was conducted for reproducing the present longitudinal profile from assumed original river bed a million years ago. The present longitudinal profiles of several rivers could be reproduced by similar parameters. Also we clarified that the erosion process, particularly the erosion front of further three rivers differed significantly during the simulated period. We showed that the above difference of erosion process can be explained by the distribution of the geologic units and that the present topography can be reproduced by simulation. It is believed from the above that rational understanding and interpretation will be possible for the actual topography by simulation. Also it is certain that the knowledge regarding the longitudinal profile simulation would form the basis when we further expand the simulation two-dimensionally to drainage basins.
日本地形学連合の論文
2008-01-25

河床縦断形のシミュレーション(<特集>数値地形図の技術と応用)

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