4ERICKSON J. Gas distribution integrity management rule is on its way[ J ]. Pipeline & Gas Journal, 2007, 234 ( 6 ): 36-39.
5WU Y H, JIN W L, SHAO B W. A new health monitoring technique on submarine pipeline[ C ]//Proceedings of International Con{erenee on Health Monitoring of Structure, Materials and Environment, Vols 1 and 2. Naniing." Southeast Univ Press, 2007:359-369.
6FRUNES G K, BERNTSEN J. On the response of a free span pipeline subjected to ocean currents[J]. Ocean Engineering, 2003,30 ( 12 ): 1553-1577.