The model 6136 turbidity sensor from YSI has become the preferred sensor for many critical turbidity monitoring projects. The popular multi-parameter sondes offer optical turbidity sensors with self-cleaning wipers that reduce maintenance intervals. The Campbell Scientific OBS 3+ (formerly D&A Instruments) uses the optical backscatter method to measure turbidity and suspended solids. Common sensor manufacturers include Campbell Scientific, YSI, In-Situ, and Hydrolab. There are many turbidity sensors on the market. It is relatively difficult and many times cost-prohibitive to measure TSS directly therefore, turbidity measurements have become the standard for monitoring suspended sediment in the field. Turbidity is defined as cloudiness or haziness of a fluid caused by individual particles or suspended solids. Turbidity measurements are often used to monitor the total suspended sediment (TSS) in the water. The purpose of the monitoring is to identify when an excessive amount of suspended solids are released into the water column as a result of excavation activities and slow down or cease dredge operations until suspended solids reach a suitable level. Oftentimes, dredging is done to reclaim areas affected by chemical spills, storm water surges (with urban runoff), and other soil contaminations.ĭuring contaminated sediment dredge operations, regulations commonly require that systems are put in place for dredge turbidity monitoring to ensure the suspended sediment levels do not exceed pre-defined ranges. Dredging is an excavation activity carried out in shallow seas and freshwater areas (lakes and rivers) to gather up bottom sediment and dispose of it at a remote location.
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