The Development of Tenjogawa (The Raised Bed River) in the Lower Reach of Kizugawa River

Abstract

Tenjogawa in Japanese means a raised bed river that has higher bed than the surrounded plain. Tenjogawa often has developed in Japan along artificially fixed river with embankments because of the convergence and deposition of sediment on the river bed. There are few geomorphologic studies on Tenjogawa because it develops under artificial conditions. This study aims to clarify the development of Tenjogawa focusing on several rivers including the Kizugawa River. We made a geomorphological map and it shows the tributaries of Kizugawa River became Tenjogawa after construction of artificial levee and fixing channel along with the mainstream of Kizugawa River.