Efficient Hydrological Tracer-Test Design (EHTD) Model
This project has three objectives. The first is to develop a method that simply and efficiently calculates the appropriate quantity of some tracer material to release into ground-water systems such that successful tracer recoveries are likely, but that concentrations are not excessive. Second, is the determination of when to initiate sample collection such that first arrival is detected. Third, after initial sample-collection time has been determined it is necessary that an appropriate sample-collection frequency be established to ensure proper breakthrough curve definition.
This effort is intended to facilitate the assessment of solute-transport processes in ground water for the Office of Solid Waste and Emergency Response and the Office of Water.
Application of the predicted tracer mass with the hydraulic and geometric parameters in the ADE allows for an approximation of initial sample-collection time and subsequent sample-collection frequency where a maximum of 65 samples were determined to be necessary for describing the predicted tracer-breakthrough curve (BTC). Inclusion of tracer retardation and decay cause a net increase in tracer-mass estimates so that the preset average tracer concentration will be maintained, with a consequent steepening of the BTC, but retardation also causes BTC spreading and a delay in tracer arrival.
Project Completion Date (Actual/Projected)
- Efficient Hydrologic Tracer-Test Design (EHTD) Program