confluence

n. flowing together of two or more streams; coming together of people or things, assemblage

Confluence, in geography, describes the meeting of two or more bodies of water. It usually refers to the point where a tributary joins a more major river, called the mainstem, when that major river is also the highest order stream in the drainage basin. The German city name Koblenz indicates, in Germanicized form, its site at the confluence of the Rhine and the Mosel.
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n. confluence

(n.)
The act of flowing together; the meeting or junction of two or more streams; the place of meeting.
  

(n.)
Any running together of separate streams or currents; the act of meeting and crowding in a place; hence, a crowd; a concourse; an assemblage.
  

A pattern of wind flow in which air flows inward toward an axis oriented parallel to the general direction of flow. It is the opposite of difluence . Confluence is not the same as convergence . Winds often accelerate as they enter a confluent zone, resulting in speed divergence which offsets the (apparent) converging effect of the confluent flow.