Gravity currents produced by full-depth lock-release of saline water into a fresh water tank are studied focusing on the influence of the initial densityof the saline mixture in the lock and the bed roughness on gravity current kinematics. Temporal evolution of the current front position and frontvelocity are analysed and related to different phases of the current. Time-space evolution of current depth-averaged density and current height areassessed as well. Roughness of the channel bed plays an important role in the current kinematics, particularly in decreasing the front velocity due toextra drag at the bed. The analysis of Froude numbers, estimated with the initial and local reduced gravity and established with different length scalesof the current, allow for the definition of the important variables and current dynamics of each phase of the current development.