Researchers of the IIAMA validate in a laboratory aquifer the technique that identifies the origin of...

Researchers of the IIAMA validate in a laboratory aquifer the technique that identifies the origin of... https://noticiasdelaciencia.com/upload/images/12_2018/345_contaminacionagua.jpg?22

Researchers of the IIAMA validate in a laboratory aquifer the technique that identifies the origin of groundwater contamination





Researchers from the IIAMA (Institute of Water and Environmental Engineering of the Universitat Politècnica de València) (Spain) have demonstrated the validity of the methodology that allows the detection of contamination of groundwater, after the last tests carried out in the laboratory aquifer of the University of Parma (Italy).

 

This is the main conclusion of the article "Joint identification of contaminant source and aquifer geometry in a sandbox experiment with the restart Kalman filter ensemble", which has been carried out by the researchers of the Hydrogeology group, Jaime Gómez-Hernández, Zi Chen, Teng Xu and Andrea Zanini (University of Parma), and published in the scientific journal, Journal of Hydrology.

 

The research is the final result of the "Who has been?" Project, where a technique based on the implementation of the Kalman filter has been developed, based on spatio-temporal measurements of the state of the aquifer (fundamentally, piezometric heights and concentrations) and specific measurements of some of its parameters (mainly, hydraulic conductivity and porosity), allows to identify how much, when and where a polluting spill has occurred.

 

"The method is able to provide estimates of different parameters such as the place where the spill occurred, the initial release time, its duration or the spatial distribution of hydraulic conductivity", highlights the head of the IIAMA Hydrogeology group.

 



 

(Photo: IIAMA)

 

The last phase of the project has been developed at the University of Parma, where models designed in synthetic aquifers have been applied to a laboratory aquifer, which fulfilled the conditions of a real one, as Dr. Gómez-Hernández explains.

 

"We have reproduced different polluting events introducing a fluorescent solute in the aquifer, analyzing how it moves, and taking specific measures of pollution downstream from where it has been produced, to see if our method is able to identify the source of pollution."

 

In fact, the IIAMA researcher points out that after monitoring some measurement points "the technique has proven its validity as long as the starting hypotheses are met, which in this case is to know the geometry of the aquifer, what are the conditions of the contour and some other parameter that in reality can be variable, as for example the dispersivity, but that we consider as fixed ".

 

For all these reasons, Dr. Gómez-Hernández describes the results as "very satisfactory" and considers that the method is fully validated to take the next step: "its application in a real case". (Source: IIAMA)
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