Abstract
The lower Shinano River is known as a typical low-lying river in Japan. The river system comprises several tributaries, a branched river and a non-embankment area. The flood propagation and bed variation in such a complex river system have not been cleared from the total views of the river basin.
In this paper, we develop the numerical model applying the BVC method and 2D bed variation using observed water surface profiles during 2011 flood in the lower Shinano River with complex river systems. We evaluate effects of the pumping drainages, inundation in non-embankment area and river improvement works on the flood control functions by using the developed numerical model.
