Abstract
Investigation of the extent of preferential flow and transport affected by several factors and their interactions in the vadose zone using the advanced measurement and modeling techniques is crucial for protection of groundwater from agricultural chemicals like fertilizers and pesticides. The objectives of this study were to investigate the interactive effects of factors like soil structure, initial soil water content (SWC), and application rate on preferential flow and transport using the time domain reflectometry (TDR) measurements of SWC and electrical conductivity (EC) in the plots of 12 treatments in a sandy clay field soil, applying the models (HYDRUS-1D and MACRO) to the measured data, performing Tukey test statistical analysis, and relating model parameters to basic soil properties, consequently, flow and transport characteristics. Analysis of response times and the changes in SWC and EC with time during the experiments in the profiles of the treatments confirmed the existence of preferential flow and transport at the site. As long as the other factors or conditions were constant; undisturbed versus disturbed soil, wet versus dry initial SWC, and high versus low application rate caused preferential flow and transport in the soil based on the TDR measurements. Overall HYDRUS-1D had better performance than MACRO in the simulations of the measured data. These results suggest that different scales of these factors in different field soils need to be further studied for better understanding the flow and transport processes in the vadose zone.
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Acknowledgments
This project has been supported by The Scientific and Technological Research Council of Turkey (TÜBİTAK) with the Project No: 104Y224. The author appreciates the assistance of Jason Ritter and his colleagues, Campbell Scientific Inc., on the CR1000 datalogger programming. The author thanks Prof. Iris Vogeler for her valuable advices on the experimental design, and Prof. Nicholas Jarvis and Prof. Jirka Simunek for their help on the modeling.
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Merdun, H. Using TDR and modeling tools to investigate effects of interactive factors on preferential flow and transport in field sandy clay soil. Environ Earth Sci 71, 1821–1838 (2014). https://doi.org/10.1007/s12665-013-2586-6
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DOI: https://doi.org/10.1007/s12665-013-2586-6