According to probing results of three newly-built waste landfill sites in China using electrical measurement method of geomembrane seepage by Shanghai Land Environmental Sci-technology Company,problems about construction destruction of impervious geomembrane in waste landfill sites were analyzed combining statistical reports of electrical seepage measurement for foreign waste landfill sites.

The water leakage detection of the system is typically a problem of weak signal extraction under strong disturbances.

The article briefly introduces seven methods used for underground tanks leakage detection recommended by EPA, five of these methods have been compulsively put in practice since December 1998.

Finite element simulation of high voltage direct current electricity technology for double liner landfill leakage detection;

Leak current model in leakage detection of HDPE liner using high voltage DC method;

A new leakage detection system based on high voltage DC method was successfully developed through comparison among foreign methods used in landfill leakage detection.

Discussion on mechanism of distributed fiber optical leakage monitoring technology based on temperature measurement;

The distributed optical fiber temperature sensing technology is a brand-new way for leakage monitoring.

Based on persistent line heat-source,the basic principle of distributed fiber optic sensing technology for leakage monitoring is expounded.