Design of a Multipoint Cost-Effective Optical Instrument for Continuous In-Situ Monitoring of Turbidity and Sediment

Area of Science:

• Environmental Science
• Optical Engineering
• Coastal Geomorphology

Background:

• Coastal areas exhibit dynamic processes requiring high spatial and temporal resolution monitoring.
• Existing monitoring systems may lack cost-effectiveness or continuous in-situ capabilities for sediment dynamics.

Purpose of the Study:

• To develop and present a cost-effective optical instrument for continuous in-situ monitoring of turbidity and sediment composition in coastal areas.
• To enable detailed analysis of sediment transport, wash load, and accumulation at multiple depths.

Main Methods:

• The instrument utilizes infrared backscatter for turbidity/sediment concentration and UV/IR transmission for organic/inorganic matter differentiation.
• In-lab calibration with formazine and analysis of external light influences were performed.
• Field deployment in an estuarine area with a water level sensor for real-world data collection.

Main Results:

• The sensor successfully monitored turbidity and sediment processes continuously at eight depths.
• The instrument demonstrated the ability to distinguish between organic and inorganic suspended material.
• Data analysis confirmed the device's potential for detailed sediment dynamics assessment in high-sediment environments.

Conclusions:

• The developed optical instrument is a cost-effective solution for continuous in-situ monitoring of coastal sediment dynamics.
• The sensor's multi-depth capability and material composition analysis offer valuable insights for environmental management.
• This technology supports enhanced understanding and management of sediment processes in dynamic coastal zones.