Movie:River Engineering


Information Page: River Engineering

Play Animation

Pollution Propagation in River with Groyns

Key Attributes

Domain: terrestrial, hydrology
Keywords: Channel Processes
Model name: 3D Detached Eddy Simulations
Name: George, Constantinescu
Where: --
When: --

Short Description

Grade level: Under graduate (13-16), Graduate / Professional

Statement: Flow field around two common structures in rivers

Abstract: These two movies show flow field around two common structures in rivers.

Groynes are one of the most effective approaches to stabilize eroding banks and to sustain navigable channels at proper depth. They are utilized in river bank protection as well as restoration projects (e.g., restore fish habitat in degraded streams). This movie shows the case of accidental pollution, a series of groynes can substantially modify the dispersion of the pollutant cloud in the river reach.

Bridge Pillars that support the structure change the flow field and promote local differences in sedimentation and erosion. This movie illustrates the shear stress around a bridge pier.



A groyn is a rigid hydraulic structure built from an ocean shore (in coastal engineering) or from a bank (in rivers) that interrupts water flow and limits the movement of sediment. In some cases it keeps velocity in the main channel such that it is suitable for shipping. In a river, groynes prevent bank erosion and ice-jamming, which in turn aids navigation. The areas between groups of groynes are groyne fields. Groynes can be made of wood, concrete, or rock piles. Their use goes back many centuries.



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