The study looked at how river flow, storm surges, and tides interact in the Meghna river estuary in Bangladesh. They used a computer model to see how these forces affect each other. River flow and tides can either help or hinder each other, depending on the tide's phase. River flow usually works against storm surges, but sometimes they can work together. River flow tends to increase the height of storm surges in the estuary, but this effect is not as noticeable further away.