This is the 9018th most frequent Japanese word.
流れ込ん
"流れ込ん" means "flow into."
Here, '流れ込んでいる' is used to describe the action of water physically moving and flowing into another body of water (the lake).
その川の水は湖に流れ込んでいる。
The water of the river flows into the lake.
In this context, '流れ込んできた' metaphorically describes the process of technologies being introduced or integrated into the industry.
新しい技術が産業に流れ込んできた。
New technologies have started flowing into the industry.
Here, '流れ込んでいる' is used symbolically to signify the influx or integration of various cultural elements into urban settings.