straumen

Straumen refers to a phenomenon where a river flows into a larger body of water, such as a lake or the sea, and the current from the river continues to be discernible for some distance into the receiving water. This is particularly noticeable in areas where the river has a significant flow rate. The term itself originates from Norwegian and literally means "the stream" or "the current."

The visible effect of straumen is often a visible difference in the water's color, temperature, or sediment load compared to the surrounding water of the lake or sea. This can create distinct lines or bands where the two water masses meet and mix. In some cases, the straumen can influence local weather patterns, particularly with regard to fog formation, as warmer river water meets cooler air over a larger body of water.

Straumen is a common occurrence at the mouths of many rivers worldwide. It is an important ecological feature, influencing the distribution of aquatic organisms and the transport of nutrients and sediment. The strength and extent of the straumen depend on factors such as river discharge, the size and depth of the receiving water body, and prevailing wind and current conditions.