Research on the behavior of fluid flow in a single fracture and its equivalent hydraulic aperture

Both the aperture and the roughness,which are the two important parameters of a single fracture,are discussed firstly. Research achievements of the fluid flow behavior in a single fracture are systematically reviewed. Various kinds of methods are described,while their rationality and applicability are discussed relatively. Based on the summary of the current achievements,moreover,future development and the possible improvement in the field are briefly discussed.