Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Researcher Develops Model to Track E. coli in Charles River

05.05.2008
It is a common belief that the water quality of the Charles River and other lakes, streams and rivers is at its worst after a large rainfall because of pollutants carried by runoff.

However, a recent study completed by researchers at Northeastern University in Boston found high concentrations of E. coli bacteria in the Charles River after a long period of no rain.

Ferdi Hellweger, Ph.D., Assistant Professor of Civil and Environmental Engineering and Acting Director of the Center for Urban Environmental Studies, both at Northeastern, used high-resolution monitoring and modeling to understand the fate and transport of E. coli bacteria in the lower section of the Charles River to determine what factors may lead to the increased concentration.

The results, which were published in the April issue of the Journal of the American Water Resources Association, go above and beyond the current data available about the water quality in the Charles and have the potential to impact the location of future beaches and their management.

Because current monitoring programs do not resolve the small-scale patterns of E. coli, Hellweger and his team carried out a high-resolution monitoring program. Using spatial and temporal surveys at different intervals and locations, Hellweger and his team gathered 757 samples along transects across and along the river, and over time at a fixed location. The results indicated an increased concentration of E. coli after a period of little rainfall.

To make sense of these results, they developed a mathematical model of the river. The model accounts for various drivers, including upstream and downstream flow, wind, combined sewer overflow (CSO) and non-CSO flow from two major tributaries, the Muddy River and the Stony Brook. Based on hydrodynamics and die-off kinetics, the model reproduced the general patterns of E. coli in the water over space and time.

“Our analysis suggests that the Stony Brook and Muddy River are the predominant sources of E. coli in the lower Charles River,” said Hellweger, whose interest in urban hydrology drove this research project. “However, it is important to determine where the bacteria go and their concentration at different times and locations.”

One surprising finding was the effect of the New Charles River Dam, which when open, allows the Charles River to flow downstream and empty into the Boston Harbor. When it is closed, however, the Charles River acts more like a lake or a reservoir, creating a static environment. Thus, in addition to rainfall, the Dam operation cycle does affect the level of bacteria in the Charles River.

“Our study results show that water quality in the Charles River is impacted by several factors, including the New Charles River Dam,” added Hellweger. “While the primary focus of the Dam is to control flooding and navigation, I think that taking water quality issues into account could help reduce public health risk to present boaters and future beachgoers in the Charles,” added Hellweger.

Their model can be used to predict water quality in the lower Charles River, which can be used to evaluate various management scenarios and assess public health risk to swimmers at different times and locations.

In a 2002 study, 25% of surveyed beaches had at least one advisory or area closed, mostly due to unsafe levels of certain forms of bacteria. Exposure to unsafe levels of bacterial can sometimes result in recreational water illnesses (RWI), causing diarrhea, respiratory, skin, ear and eye infections.

Water pollution continues to be a public health threat, and because the Summer is quickly approaching, there will be a heightened interest in protecting people who spend time in the water. “My goal is to help make the Charles River a place where people can swim safely,” said Hellweger.

About Northeastern

Founded in 1898, Northeastern University is a private research university located in the heart of Boston. Northeastern is a leader in interdisciplinary research, urban engagement, and the integration of classroom learning with real-world experience. The university’s distinctive cooperative education program, where students alternate semesters of full-time study with semesters of paid work in fields relevant to their professional interests and major, is one of the largest and most innovative in the world. The University offers a comprehensive range of undergraduate and graduate programs leading to degrees through the doctorate in six undergraduate colleges, eight graduate schools, and two part-time divisions.

Fred McGrail | newswise
Further information:
http://www.northeastern.edu/

More articles from Ecology, The Environment and Conservation:

nachricht Bioinvasion on the rise
15.02.2017 | Universität Konstanz

nachricht Litter Levels in the Depths of the Arctic are On the Rise
10.02.2017 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Stingless bees have their nests protected by soldiers

24.02.2017 | Life Sciences

New risk factors for anxiety disorders

24.02.2017 | Life Sciences

MWC 2017: 5G Capital Berlin

24.02.2017 | Trade Fair News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>