Context:
In a bid to resolve the extensive coastal erosion in Poonthura region in Kerala, the irrigation department is all set to construct eight groynes at a cost of Rs 17.5 crore.
Relevance:
Facts for Prelims
Groynes
Groynes are coastal structures designed to manage shoreline erosion and sediment movement. Here are some key points about groynes:
- Structure and Purpose: Groynes are typically built perpendicular or at a slight angle to the shoreline. They are constructed from materials such as wood, rock, concrete, or metal. Their primary purpose is to trap sediment moving along the shore due to longshore drift.
- Functionality: Groynes work by interrupting the movement of sediment along the beach caused by wave action and longshore currents. By trapping sediment on their updrift side, they help widen beaches and reduce erosion on the downdrift side.
- Advantages:
- Erosion Control: Groynes effectively reduce shoreline erosion by stabilizing the beach profile and preventing sediment loss.
- Sediment Trapping: They trap sediment carried by longshore drift, promoting beach nourishment and wider beaches.
- Wave Energy Dissipation: Groynes dissipate wave energy, reducing the impact of waves on the shoreline and protecting coastal infrastructure.
- Durability and Maintenance: They are relatively easy to construct, have long-term durability, and require minimal maintenance compared to other coastal protection measures.
- Long-Term Stability: When properly designed and maintained, groynes serve as robust structures that contribute to the long-term stability of coastal areas used for various societal activities, such as recreation and development.
-Source: Times of India
