Effects of Different Factors on Water Flow and Solute Transport Investigated by Time Domain Reflectometry in Sandy Clay Loam Field Soil

Merdun, Hasan
September 2012
Water, Air & Soil Pollution;Sep2012, Vol. 223 Issue 8, p4905
Academic Journal
Factors affecting preferential flow and transport in the vadose zone need to be investigated by experiments and simulations to protect groundwater against surface applied chemicals. The objectives of this study were to investigate the effects of several factors (soil structure, initial soil water content (SWC), and application rate) and their interactions on the extent of preferential flow and transport in a sandy clay loam field soil using the time domain reflectometry (TDR) for measuring SWC and electrical conductivity (EC) in 12 treatments, modeling (by HYDRUS-1D and VS2DTI) the measured SWC and EC, and conducting statistical tests for comparing the means of the measured and modeled SWC and EC and solute transport parameters (pore water velocity and dispersion coefficient) obtained by inversely fitting in the CXTFIT program. The study results showed that the applied solution moved faster in the undisturbed, wet initial SWC, and higher application rate experimental conditions than in the disturbed, dry initial SWC, and lower application rate, respectively, based on the analysis of the changes in TDR measured SWC and EC with depth at 1, 2, 5, and 15 h of the experiments. However, the effects of interactive factors or treatments on water flow and solute transport were not clear enough. The modeling results showed that HYDRUS-1D was better than VS2DTI in the estimation of EC and especially SWC, but overall the models had relatively low performances in the simulations. Statistical test results also showed that the treatments had different flow and transport characteristics because they were divided into different groups in terms of the means of SWC and EC and solute transport parameters. These results suggest that similar experiments with more distinct interactions and modeling studies with different approaches need to be considered for better understanding the complex flow and transport processes in the vadose zone.


Related Articles

  • Effects of soil moisture content and tractor wheeling intensity on traffic-induced soil compaction. AHMADI, Iman; GHAUR, Hossein // Journal of Central European Agriculture;2015, Vol. 16 Issue 4, p489 

    Soil compaction causes deleterious effects on physical and mechanical proprieties of agricultural soils. In order to investigate the effect of soil moisture content and tractor wheeling intensity on traffic-induced soil compaction, this study was carried out on a field with clay loam soil. Soil...

  • Evaluation of soil-tire interaction on a soil bin. Farhadi, P.; Mohsenimanesh, A.; Alimardani, R.; Ahmadi, H. // Agricultural Engineering International: CIGR Journal;Mar2013, Vol. 15 Issue 1, p37 

    A single wheel tester with the attention to the size of soil bin has been designed and fabricated to study soil tire interactions, in controlled soil environment. The main parts of a single wheel tester include chassis, reduction gear unit, three-phase AC electric motor, hydraulic cylinder,...

  • M&G joins shortlist to run business loans fund.  // Fund Strategy;3/26/2012, p13 

    The article discusses the budget by British Chancellor of Exchequer George Osborne, and how it would alter retail investment sector. It states that the budget did not alter retail investment sector significantly. It states seven groups including M&G Investment Management, Alcentra Co., and Cairn...

  • McMaster Mesonet soil moisture dataset: description and spatio-temporal variability analysis. Kornelsen, K. C.; Coulibaly, P. // Hydrology & Earth System Sciences;2013, Vol. 17 Issue 4, p1589 

    This paper introduces and describes the hourly, high-resolution soil moisture dataset continuously recorded by the McMaster Mesonet located in the Hamilton-Halton Watershed in Southern Ontario, Canada. The McMaster Mesonet consists of a network of time domain reflectome-ter (TDR) probes...

  • Investigation of Interactive Effects on Water Flow and Solute Transport in Sandy Loam Soil Using Time Domain Reflectometry. Merdun, Hasan // Sensors (14248220);2012, Vol. 12 Issue 7, p9749 

    Surface-applied chemicals move through the unsaturated zone with complex flow and transport processes due to soil heterogeneity and reach the saturated zone,resulting in groundwater contamination. Such complex processes need to be studied by advanced measurement and modeling techniques to...

  • Effects of macropore continuity on water movement and solute transport in a loessial soil. B. B. Zhou; S. Li; Q. J. Wang; Y. L. Jiang; Y. Li // Australian Journal of Crop Science;2012, Vol. 6 Issue 6, p1024 

    Flow through macropores, created by soil pedogenesis and biological activity, play important roles in soil water and chemical transport on the Loess Plateau. Numerous studies have examined individual macropores and the effects of their size on solute transport, but few have assessed the effects...

  • Soil moisture increment as a controlling variable of the 'Birch effect'. Interactions with the pre-wetting soil moisture and litter addition. Lado-Monserrat, Luis; Lull, Cristina; Bautista, Inmaculada; Lidón, Antonio; Herrera, Rafael // Plant & Soil;Jun2014, Vol. 379 Issue 1/2, p21 

    Aims: The Birch effect is a pulse in soil C and N mineralization caused by the wetting of dry soils, but the role of the soil moisture increment ( ΔSWC) is still poorly understood. We quantified the relationship between ΔSWC and the Birch effect, and its interactions with pre-wetting...

  • Effect of different tillage practices on soil physical properties under wheat in semi-arid environment. Amin, Muhammad; Khan, Muhammad Jamal; Jan, Muhammad Tariq; Rehman, Masood ur; Tariq, Javaid Akhtar; Hanif, Muhammad; Shah, Zahir // Soil & Environment;2014, Vol. 33 Issue 1, p33 

    To study the effect of different tillage practices on physical properties of a silty clay loam soil under irrigated wheat in a semi-arid environment, a field experiment was conducted at the research farm of the University of Agriculture Peshawar, Pakistan during 2009-10 and 2010-2011, The...

  • Dielectric Properties of Clay Loam Soil at Lower Microwave Frequencies. Buliya, Asha; Pancholi, K. C.; Paliwal, R. K.; Bhatnagar, S. P. // Solid State Phenomena;2014, Vol. 209, p229 

    Real and Imaginary parts (ε' & ε") of the Complex Dielectric Permittivity (ε*) of Clay Loam soil collected from Nanta Farm, CAD, Kota, Rajasthan have been measured using a Vector Network Analyzer with varied Moisture contents and Salinity levels in the frequency range 150 MHz to 2.2...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics