A professor at my university is currently working on using "complex network theory to study the coherence of flows in ocean circulation". If I'm interested, I could possibly do my bachelor thesis on this subject. Before I go talk to him, I'd like to at least have some idea of what this is actually about, so I don't waste his time, but I can find almost nothing on this subject. Just what does studying the coherence of flows in ocean circulation mean? How can you use complex network theory to study it?