What is shallow flow?

Shallow flow refers to fluid motion where the depth of the fluid is small compared to its horizontal extent, typically occurring in rivers, lakes, or coastal areas. This type of flow is characterized by a thin layer of water, which affects how the fluid interacts with its boundaries and the forces acting upon it. In shallow flow, gravity plays a significant role, and the dynamics can be influenced by factors such as friction and wave interactions. It is often modeled using simplified equations, such as the shallow water equations, to understand and predict behavior in various environmental contexts.