Relationship between landform and flooded area caused by Kanto-Tohoku heavy rainfall disaster on September 2015 around Kinu River

A case of Maegawara area in Shimotsuma City

Abstract

Flood disaster around Kinu River associated with Kanto-Tohoku heavy rainfall on September 2015 caused severe damages around Joso City and Shimotsuma City, Ibaraki Prefecture. The boundary of flooded area was located generally around boundary between lowland (ex. backmarsh) and relative higher lowland (ex. natural levee) in Joso City. On the other hand, a part of Pleistocene terraces on landform classification map for flood control were flooded in Shimotsuma City. Therefore, we investigated the relationship between flooded area and landform at the site by comparing the flooded area data, landform classification map for flood control, and airborne LiDAR DEM data.