Local transformation ratio scale resistance similarity design method for global river network physical model

The invention relates to a global river network physical model local transformation scale resistance similarity design method. A global physical model scale is determined according to a global river network range and site conditions. Determining a local river channel/local gate which does not meet resistance similarity in the global river network, and obtaining actual on-way head loss/actual local head loss; a local river channel/gate variable scale physical model overflowing capacity test is carried out, and a proper local river channel/gate scale is determined; and establishing a proper correlation between the local river channel/gate scale and the local river channel/gate width, and proposing a local river channel/gate scale similarity law. The invention provides a local transformation scale design method capable of satisfying similar overflowing capability, and a resistance effect barrier caused by too small local river channel and gate scale of a global river network physical model is broken through. The