Research on the coupling degree measurement model of urban gas pipeline leakage disaster system

Under the changing and complex urban environment, gas pipeline leakage disasters are becoming increasingly complicated. In order to make a quantitative analysis of the coupling degree among each factor at different grades, this study adopts the comprehensive indexes of gas pipeline leakage disaster system based on AHP (Analytic Hierarchy Process) and Entropy method. The calculation model of coupling degree is then established in accordance with the coupling degree theory in physics. This study takes a region in Beijing as an example and calculates the coupling degree of urban gas pipeline leakage disaster system. The result shows the coupling degree of disaster system is 0.303, which indicates that the whole disaster system is in a status of moderately unbalanced development (acceptable interval). The occurrence of disaster is subject to disaster-inducing environment and disaster-bearing body, and the disaster-inducing environment is slightly more obstructive to occurrence of disaster. On the other side, controlling the disaster-inducing factors can reduce the coupling degree of disaster system. The model is helpful to evaluate the development state of the disaster system, and point out the direction of disaster control.