Applicability of the Surplus Map to Small Landform Changes on River Bank and Its Surroundings: Case Study of the Kinu River

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  • 河川堤防及びその周辺の微小な地形変化への剰余地図の適用性―鬼怒川の事例

Abstract

<p>Using the laser data borrowed from the Geospatial Information Authority of Japan, we investigated the landform changes of dikes and high water channels downstream of the Kinu River. Areas with the unique elevation changes could be interpreted from the striped pattern in the surplus maps created from the value of elevation change. Based on the shape of the striped pattern, relative elevation change and land use information, artificial modification of bank slope, sediment movement due to flood, deformation of the entire river bank, and some deformation on bank crest and bank slope were estimated in these change areas. Furthermore, we confirmed that new construction of a road connecting to the bank crest, development of slightly high land and shallow valley in the high water channels, and tilting and sinking of a part of road due to undergrounding work occurred at these change areas. It was also pointed out that the unique elevation change may indicate the widening of the crest, the process of bulging and collapse of the slope, and the influence of weeding.</p><p>Even if the old and new laser data have different accuracies and point cloud densities, it is easy to interpret landform changes on various spatial scales from meaningful elevation changes occurring in artificial modified lands such as dikes and high water channels by using surplus maps.</p>

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