Modeling Physical Impact on Water Environment at Accidents on Underwater Gas Pipelines

Mathematical models describing the processes taking place at gas pipeline breaking are presented. The characteristics of the non-steady-state gas flow from the underwater pipeline into water are calculated using hyperbolic equations of gas dynamics. It is shown that the model of gas-liquid jet propagation in water, based on experimental data, allow the evaluation of the rate, mass, and the time of discharge, the size of pollution source, the density of gas–water mixture, and the pollutant concentrations on water surface at different scenarios of accidents. An example of calculation of these characteristics is given.