Comprehensive health condition assessment on partial sewers in a southern Chinese city based on fuzzy mathematic methods |
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Authors: | Lili Gan Jiane Zuo Yajiao Wang Thong Soon Low Kaijun Wang |
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Institution: | 1. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
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Abstract: | A self-developed sewer health assessment system using the fuzzy comprehensive evaluation and analytical hierarchy process was applied to give a comprehensive health condition evaluation on part of the local sewers in a southern Chinese city based on the sewer video data collected by a sewer inspection closed circuit television (CCTV) robot. Aside from the overall condition evaluation, the structure, function, and stability status of the sewer were also analyzed using the method. A comprehensive index H was proposed to give the overall health condition of pipes with different defects, and H t , H s , and H f were used to quantify the defects affecting the tightness, stability, and function of the pipe, respectively. Results show that 48% of the inspected pipes were in good condition (0<H<0.25), and about 33% of the sewer pipes analyzed were categorized to be at severe or urgent condition levels (H>0.5), although most of the pipes were installed only within five years. Frequent sedimentation affects the function of the sewer, and deformation and joint damage affect the structure of the sewer. |
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Keywords: | sewer health condition assessment analyticalhierarchy process fuzzy comprehensive evaluation fuzzymathematic method |
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