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GIS characterization of spatially distributed lifeline damage

Technical Council on Lifeline Earthquake Engineering Monograph

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Abstract

This paper describes the visualization of spatially distributed water pipeline damage following an earthquake using geographical information systems (GIS). Pipeline damage is expressed as a repair rate (RR). Repair rate contours are developed with GIS by dividing the study area into grid cells (n ?? n), determining the number of particular pipeline repairs in each grid cell, and dividing the number of repairs by the length of that pipeline in each cell area. The resulting contour plot is a two-dimensional visualization of point source damage. High damage zones are defined herein as areas with an RR value greater than the mean RR for the entire study area of interest. A hyperbolic relationship between visual display of high pipeline damage zones and grid size, n, was developed. The relationship is expressed in terms of two dimensionless parameters, threshold area coverage (TAC) and dimensionless grid size (DGS). The relationship is valid over a wide range of different map scales spanning approximately 1,200 km2 for the largest portion of the Los Angeles water distribution system to 1 km2 for the Marina in San Francisco. This relationship can aid GIS users to get sufficiently refined, but easily visualized, maps of damage patterns.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
GIS characterization of spatially distributed lifeline damage
Series title:
Technical Council on Lifeline Earthquake Engineering Monograph
Issue:
16
Year Published:
1999
Language:
English
Publisher:
ASCE
Publisher location:
Reston, VA, United States
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Technical Council on Lifeline Earthquake Engineering Monograph
First page:
110
Last page:
119
Number of Pages:
10
Conference Title:
Proceedings of the 1999 5th U.S. Conference on Lifeline Earthquake Engineering: Optimazing Post-Earthquake Lifeline System Reliability
Conference Location:
Seattle, WA, USA
Conference Date:
12 August 1999 through 14 August 1999