Physical habitat simulation in river in which minimum flow changes seasonally with PHABSIM

The minimum flow of the ohyama river changes seasonally. At present time, from 21th March to 30th September, the minimum flow is 4.5 m3/s, and that is 1.8 m3/s from 1st October to 20th March. The minimum flow is 1.5 m3/s before. The effect of the minimum flow on the physical situations, for example, water width, water depth and flow velocity, are studied by using an numerical simulation. Furthermore, a physical habitation for an ayu also is estimated by using the PHABSIM. It is conformed that the increase of the minimum flow gives good physical situation to ayus.

the Ohyama river

minimum flow

physical habitation

PHABSIM