RESEARCH ON THE DEGRADATION OF PIPELINES POSITIONED IN THE UNDERCROSSING OF RIVERS

Abstract

The intensification of the phenomenon of hydrodynamic erosion of riverbeds, determined by the passage of rapid floods, affects the stability of constructions and installations positioned in the flow section. The paper presents an analysis of the behavior of the Poiana Uzului - Bacau adduction pipeline on the undercrossing section of the Tazlaul Sarat river. The June 2016 flood on the Tazlaul Sarat River, with a flow rate of 342 m3/s, morphologically changed the flow section where the 800 mm diameter cast iron adduction pipe is located in the underpass. The flood changed the route of the minor bed towards the right bank, a situation in which the adduction pipe was exposed. The suspension of the pipeline, made of cast iron tubes plugged into a length of about 30 m, introduced a risk of rupture of the adduction. The combination of natural and anthropogenic factors determined the degradation of the pipeline.