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Monitoring System on ferry measures Delaware Bay water quality data


Source: YSI - a Xylem brand

This summer, a unique research project using a complex, automated measurement and sampling system on the MV Twin Capes was launched by the University of Delaware College of Earth, Ocean, and Environment (CEOE), with the cooperation and assistance of Delaware River and Bay Authority (DRBA). The SeaKeeper 1000, manufactured and installed aboard the ferry vessel by YSI, collects water quality data while the vessel transits the Delaware Bay.

“Although historically it did not suffer the extreme pollution of the urban Delaware River, the Delaware Bay does suffer from more subtle ‘pollution,’ habitat destruction and overfishing,” said Jonathan Sharp, Oceanography professor at CEOE, who has been studying the estuary of the Delaware River and Bay for more than three decades and is assisted in this project by PhD student Yoana Voynova. “A research understanding is necessary to eventually provide a routine monitoring capability to assist in managing the valuable resources of the Delaware Estuary.”

Despite hundreds of research cruises from Sharp’s group and continual monitoring of the full length of the estuary for over 40 years, the sampling density is not sufficient to describe and quantify the water exchange across the mouth of the bay. The current research effort is beginning to change this reality. With up to eight crossings a day by the ferry vessel, there is ample opportunity to provide real-time readings and to scoop up water samples for the researchers. More detailed data and information has been gathered this summer on the exchange across the mouth of the bay than all of the previous monitoring and sampling of close to a half-century.

The SeaKeeper 1000's modular platform is mounted with the following enclosed components: computer controller, pump and water quality sensors, and meteorological station. Small, through-hull gate valves pump seawater into the instrument where the sensors measure it and log the data. The data can also be accessed remotely and a subset is also telemetered to NOAA's Volunteer Observing Ship Program. With future funding the data will be viewable onboard the ferry system through an interactive kiosk.

As the ferry crosses the mouth of the bay, water is pumped from the bay into the system in the bow of the vessel where continuous measurements are made of:

  • Temperature and salinity of the water--to track salt water exchange in and out of the bay
  • Dissolved oxygen--giving balance between photosynthesis from microscopic plants and oxygen demand from animals and bacteria
  • Chlorophyll content--an estimate of the amount of microscopic plant material that is in the water

The data gathered not only allow tracking of the water from within the Delaware Bay and offshore, but also provide researchers with an indication of the health and vitality at the mouth of the Delaware Estuary, which provides drinking water to a significant portion of the US, New York City and Philadelphia municipal areas.

“We are very excited to have partnered with the University of Delaware and DRBA to initiate what we hope will be a long-term ferry monitoring program,” remarked Chris Heyer, YSI Technical Sales for the Mid-Atlantic Region. “The data generated by this program will give scientists and managers a better understanding of the complexities of the estuary, and it is our hope that the data will ultimately help guide future management and restoration actions to improve the Delaware Estuary.'

The research project, funded by the National Oceanic and Atmospheric Administration through the Delaware Sea Grant program, will likely continue for another two years. After this project, the measurements should be continued as part of routine monitoring.

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