caa a22 4500 467931119 CHVBK 20180406152943.0 cr unu---uuuuu 170328e20061001xx s 000 0 eng 10.1007/s10706-005-1135-9 doi (NATIONALLICENCE)springer-10.1007/s10706-005-1135-9 The log-normal distribution for hydraulic conductivity of compacted clays: Two or three parameters? [Elektronische Daten] [Huaming Zhai, Craig Benson] Risk and uncertainty assessments for waste containment systems employing clay barriers often include spatial variability in the hydraulic conductivity as part of the analysis. The two-parameter log-normal distribution is often used to describe the spatial variability, but for compacted clays the three-parameter form can be more appropriate. A statistical hypothesis test was developed that can be used to determine if the two- or three-parameter form of the log-normal distribution is more appropriate. The test is based on a likelihood ratio, comparing likelihood functions for the two- and three-parameter forms at their maximums. Likelihood functions are used assuming that a data set can be segregated into a set of distinct groups of hydraulic conductivities. A step-by-step calculation procedure is described and the test is applied to data collected from 45sites. Springer, 2006 clay liner nationallicence hydraulic conductivity nationallicence hypothesis test nationallicence landfill nationallicence lognormal distribution nationallicence spatial variability nationallicence Zhai Huaming Department of Civil and Environmental Engineering, University of Wisconsin, 2214 Eng. Hall, 1415 Engineering Drive, 53706, Madison, WI, USA aut Benson Craig Department of Civil and Environmental Engineering, University of Wisconsin, 2214 Eng. Hall, 1415 Engineering Drive, 53706, Madison, WI, USA aut Geotechnical & Geological Engineering Kluwer Academic Publishers 24/5(2006-10-01), 1149-1162 0960-3182 24:5<1149 2006 24 10706 https://doi.org/10.1007/s10706-005-1135-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10706-005-1135-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhai Huaming Department of Civil and Environmental Engineering, University of Wisconsin, 2214 Eng. Hall, 1415 Engineering Drive, 53706, Madison, WI, USA aut NATIONALLICENCE 700 1- Benson Craig Department of Civil and Environmental Engineering, University of Wisconsin, 2214 Eng. Hall, 1415 Engineering Drive, 53706, Madison, WI, USA aut NATIONALLICENCE 773 0- Geotechnical & Geological Engineering Kluwer Academic Publishers 24/5(2006-10-01), 1149-1162 0960-3182 24:5<1149 2006 24 10706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer