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Browsing by Author "Jankovic, Igor"

Now showing 1 - 3 of 3
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    Spatial and Temporal Analysis of Groundwater Recharge with Application to Sampling Design
    (Water Resources Research Center, University of Minnesota, 1995-07) Andricevic, Roko; Foufoula-Georgiou, Efi; Jankovic, Igor
    The most influential process for the groundwater shallow aquifer monitoring is groundwater recharge. This study focuses on defining and quantifying the groundwater recharge as a process primarily resulting from precipitation. The spatial and temporal distribution of the recharge was analyzed through a numerical experiment designed to realistically describe a shallow aquifer case. The spatial and temporal structure of the recharge was examined and quantified as a function of precipitation events and soil heterogeneity. The quantified spatial and temporal distribution of the groundwater recharge then was used to demonstrate its influence on sampling network design. It was found that the temporal variability of the recharge has a major impact on the design of groundwater flow monitoring networks.
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    Statewide Statistical Subgrade Characterization
    (Minnesota Department of Transportation, 1995-06) Barnes, Randal J.; Jankovic, Igor; Colom, David
    This report presents a detailed statistical analysis and graphical presentation of more than 120,000 subgrade modulus values from Minnesota state roads and highways. These subgrade modulus values are based on Falling Weight Deflectometer measurements collected by the Minnesota Department of Transportation between 1983 and 1993. The report gives a one-page summary for each road in each district where measurements exist. This summary page contains a plot of the modulus versus the reference post, modulus versus year when a measurement is collected, modulus histogram, and a number of state-wide summaries. The one-page summaries are accompanied by a number of district and state-wide summaries, and nomograms for the selection of sample spacing, to form the state of Minnesota subgrade modulus Atlas. In addition to this report, a Microsoft Windows-based computer program, the Minnesota Subgrade Modulus Atlas--Online, allows for the detailed analysis of the subgrade modulus along state roads and highways. This analysis can be carried out on a state-wide scale, on a small project scale of less than one mile, or any scale in between. "This electronic form of the Atlas can be easily upgraded as additional measurements become available.
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    Statistical Analysis of the Sources of Flexible Pavement Variability
    (Minnesota Department of Transportation, 1999-02) Barnes, Randal J.; Jankovic, Igor; Froment, Arnaud
    This research project attempts to identify, quantify, and statistically characterize the components of asphalt pavements that may lead to spatial variability of pavement performance. This assessment is based upon the extensive data sets collected at the MnROAD project. The physical site characterization is carried out using data collected by falling weight deflectometer, ground penetrating radar, and physical core specimens. The applied load information is inferred from the data collected by the state-of-the-art weigh-in-motion system in operation at the MnROAD site. The pavement performance is characterized by international roughness index data, crack count data, and rutting depth data.