10.4122/1.1000001551 Mignot, E. Riviere, N. Perkins, R. Paquier, A. Flow structure at the junction of four supercritical channel flows DTU Library, Technical University of Denmark (DTU) 2005 Supercritical junction flow Urban flooding Hydraulic jump Oblique jump channel intersection Cemagref Lyon Laboratoire de M\303\251canique des Fluides et d\342\200\231Acoustique en Conference presentation 10.4122/1.1000001552 text/xml 1 Supercritical flow in a 4 branch channel intersection has been studied theoretically, experimentally and numerically. The flow configuration investigated here consists of one oblique jump in the junction and one normal jump in an upstream branch, along with a deflection line, one eddying zone and two recirculation zones. The water depths have been measured rather precisely at 580 points in the junction, to provide a data base for testing theoretical and numerical models. We develop an analytical model based on the momentum equation, which predicts the angle of the oblique jump and the deflection angle for the flow. The predictions are in reasonable agreement with the experimental data. The flow being well known, the capacities of a 2D model to simulate this flow are tested. It appears that the computed flow structures are similar to the observed flow features even though some discrepancies appear concerning the shapes of these structures.