Comprehensive health condition assessment on partial sewers in a southern Chinese city based on fuzzy mathematic methods

doi:10.1007/s11783-013-0554-8

Front Envir Sci Eng

2014, Vol. 8

Issue (1) : 144-150 https://doi.org/10.1007/s11783-013-0554-8

RESEARCH ARTICLE

Comprehensive health condition assessment on partial sewers in a southern Chinese city based on fuzzy mathematic methods

Lili GAN, Jiane ZUO(

), Yajiao WANG, Thong Soon LOW, Kaijun WANG

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.

Keywords sewer health condition assessment analytical hierarchy process fuzzy comprehensive evaluation fuzzy mathematic method

Corresponding Author(s): ZUO Jiane,Email:jiane.zuo@tsinghua.edu.cn

Issue Date: 01 February 2014

Cite this article:

Lili GAN,Jiane ZUO,Yajiao WANG, et al. Comprehensive health condition assessment on partial sewers in a southern Chinese city based on fuzzy mathematic methods[J]. Front Envir Sci Eng, 2014, 8(1): 144-150.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0554-8
https://academic.hep.com.cn/fese/EN/Y2014/V8/I1/144

Tab.1 Piecewise functions of some of the defined defects

Fig.1 Example of a 27 cm crack expressed as a piecewise function

Fig.2 Hierarchical structure of the assessment process

Fig.3 Example of the identification and calculation of the obstacles degree of a pipe

Tab.2 Examples of the recorded assessment results of pipes

Fig.4 Percentage of the overall health condition levels of pipes

Fig.5 Frequency of defect occurrence. D: deformation; OO: other obstacles; SD: sedimentation; AD: attached deposits; I: groundwater infiltration; JD: joint damage; DJ: displaced joint; IS: ingress of soil; S: surface corrosion; R: plant roots; B: break/collapse

Fig.6 Relative ratios of the functional and structural defects

Fig.7 Average value of indexes with standard deviation

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