We present a numerical model developed to rationally predict the trajectory, the run-out distance and frontal velocity of pulsed submarine mass gravity flows, and illustrate how it forms an essential building block of an integrated geohazards assessment for deep offshore pipeline and cable developments. The model is inspired from Center-of-Mass approaches initially proposed for pulsed snow avalanches, but specifically adapted to the treatment of submarine sediment density flows. We outline how the modeling approach fits into the broader classes of possible modeling strategies and discuss the implications in terms of CPU requirements for field applications. The model relies on simple mass and momentum balance relations for the frontal part of the sediment density flow, with additional terms accounting e.g. for ambient mixing, sediment detrainment or added mass. Depending on the sediment type various rheologies and friction relations can be adopted. Herein we consider a shear resistance derived from a Herschel-Bulkley rheology and a Chezy-type entraining shear relation.