The depression becomes gradually asymmetric with the distance from the channel margin. Its amplitude was usually smaller on the shoals compared to the channel edges but did not change significantly from one device to another (except at site B3, located in very shallow water where an increase in height was observed). The predominant process was an increase in the front/rear asymmetry of the wave profile. Its front slope became gradually less steep while the rear slope rapidly became steeper with the water surface exceeding the undisturbed level for a short BIIB021 at the end of the some of the depression events. The asymmetry (defined as the ratio of typical values of the rear and front slopes) is gap junctions usually well below 1.5 at sites W0 and B0 and increases to the level of 2–3 at sites B1 and B2, and to ∼10 at sites W3 and B3. The overall appearance of the depression at sites B1–B3 and W1–W3 is a strongly skewed V-like shape. In most occasions an extremely steep section of the rear slope develops at the eastern (lagoon) side of the channel. Interestingly, virtually all records on the shoals demonstrate the development of a step, or a sequence of smaller steps on the rear slope of the depression wave.