Reference Number | Y130202 |
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Title | Study on environmental conservation in the riverine estuaries damaged at large-scale. |
Start-End Date | 2013.4-2014.3 |
Division | River Division, River Department |
Author | Head, Atsushi HATTORI Senior Researcher, Keigo NAKAMURA Researcher, Hiroyuki SUZUKI Guest Research Engineer, Yoshiyuki MAEDA |
Summary | In this study, we collected the data of geomorphology and biology on five major rivers along the Pacific in Tohoku district, and analyzed the influence of the Great East Japan Earthquake. Comparing the geomorphology in riverine estuaries before and after the earthquake, we found the loss of river-mouth sandbar and the vegetation at riverine estuaries. Changes of biota and littoral habitat by extension of the salt water and the formation of the salt stratification by the disappearance of the river-mouth sandbar and land subsidence were confirmed. Habitat of littoral ecotone and the river mouth sandbar were in recovery state, therefore it was assumed that these influence could gradually recover with time. |