Simple indicator kriging for estimating the probability of incorrectly delineating hazardous areas in a contaminated site
Abstract
The probability of incorrectly delineating hazardous areas in a contaminated site is very important for decisionmakers because it indicates the magnitude of confidence that decisionmakers have in determining areas in need of remediation. In this study, simple indicator kriging (SIK) was used to estimate the probability of incorrectly delineating hazardous areas in a heavy metalcontaminated site, which is located at Taoyuan, Taiwan, and is about 10 ha in area. In the procedure, the values 0 and 1 were assigned to be the stationary means of the indicator codes in the SIK model to represent two hypotheses, hazardous and safe, respectively. The spatial distribution of the conditional probability of heavy metal concentrations lower than a threshold, given each hypothesis, was estimated using SIK. Then, the probabilities of false positives ({alpha}) (i.e., the probability of declaring a location hazardous when it is not) and false negatives ({beta}) (i.e., the probability of declaring a location safe when it is not) in delineating hazardous areas for the heavy metalcontaminated site could be obtained. The spatial distribution of the probabilities of false positives and false negatives could help in delineating hazardous areas based on a tolerable probability level of incorrect delineation. In addition, delineation complicatedmore »
 Authors:

 National Taiwan Univ., Taipei (Taiwan, Province of China). Graduate Inst. of Agricultural Chemistry
 Publication Date:
 OSTI Identifier:
 655390
 Resource Type:
 Journal Article
 Journal Name:
 Environmental Science and Technology
 Additional Journal Information:
 Journal Volume: 32; Journal Issue: 17; Other Information: PBD: 1 Sep 1998
 Country of Publication:
 United States
 Language:
 English
 Subject:
 54 ENVIRONMENTAL SCIENCES; PROBABILITY; SOILS; HAZARDOUS MATERIALS; REMEDIAL ACTION; TAIWAN; LAND POLLUTION; METALS; SITE CHARACTERIZATION; KRIGING
Citation Formats
Juang, K W, and Lee, D Y. Simple indicator kriging for estimating the probability of incorrectly delineating hazardous areas in a contaminated site. United States: N. p., 1998.
Web. doi:10.1021/es9706007.
Juang, K W, & Lee, D Y. Simple indicator kriging for estimating the probability of incorrectly delineating hazardous areas in a contaminated site. United States. doi:10.1021/es9706007.
Juang, K W, and Lee, D Y. Tue .
"Simple indicator kriging for estimating the probability of incorrectly delineating hazardous areas in a contaminated site". United States. doi:10.1021/es9706007.
@article{osti_655390,
title = {Simple indicator kriging for estimating the probability of incorrectly delineating hazardous areas in a contaminated site},
author = {Juang, K W and Lee, D Y},
abstractNote = {The probability of incorrectly delineating hazardous areas in a contaminated site is very important for decisionmakers because it indicates the magnitude of confidence that decisionmakers have in determining areas in need of remediation. In this study, simple indicator kriging (SIK) was used to estimate the probability of incorrectly delineating hazardous areas in a heavy metalcontaminated site, which is located at Taoyuan, Taiwan, and is about 10 ha in area. In the procedure, the values 0 and 1 were assigned to be the stationary means of the indicator codes in the SIK model to represent two hypotheses, hazardous and safe, respectively. The spatial distribution of the conditional probability of heavy metal concentrations lower than a threshold, given each hypothesis, was estimated using SIK. Then, the probabilities of false positives ({alpha}) (i.e., the probability of declaring a location hazardous when it is not) and false negatives ({beta}) (i.e., the probability of declaring a location safe when it is not) in delineating hazardous areas for the heavy metalcontaminated site could be obtained. The spatial distribution of the probabilities of false positives and false negatives could help in delineating hazardous areas based on a tolerable probability level of incorrect delineation. In addition, delineation complicated by the cost of remediation, hazards in the environment, and hazards to human health could be made based on the minimum values of {alpha} and {beta}. The results suggest that the proposed SIK procedure is useful for decisionmakers who need to delineate hazardous areas in a heavy metalcontaminated site.},
doi = {10.1021/es9706007},
journal = {Environmental Science and Technology},
number = 17,
volume = 32,
place = {United States},
year = {1998},
month = {9}
}