In deep fjords, the flushing of layers above sill level is often dominated by intermediary circulation caused by coastal density field fluctuations, rather than by estuarine circulation and tidal exchanges. Intensive observations of such a flushing event in Gullmar fjord, Sweden, including 20 microstructure profiling transects through the entrance during two 24 hour periods, show that dissipation rates of turbulent kinetic energy were enhanced in the inflowing layers in a wedge extending six kilometers into the fjord from the narrow entrance. The density and dissipation rate fields reveal non-linear, oblique internal wave beams with typical horizontal length scales from 0.3 to 3 km extending from the bottom and from the halocline near the entrance towards the center of the inflowing layer, bounding the enhanced dissipation wedge. Various generation mechanisms for these beams are discussed and related to the total loss of energy and diapycnal mixing in the inflowing layers.