SIMULATION ANALYSIS AND DELIMITATION OF FLOOD SPOTTS ON THE POTI RIVER IN THE CITY OF TERESINA-PI

Abstract

Flooding is considered one of the most common natural hazards and with great impacts, which can result in serious economic, ecological and social losses, which directly reflect on riverside communities. The City of Teresina, Capital of the State of Piauí, stands out among the riverside cities in Brazil for having its urban area located between two rivers, Parnaíba and Poti. What should worry public managers about the imminent riverine floods that can occur as a result of heavy rainfall events that have been happening in recent years. Many of the impacts caused by floods in coastal areas, especially deaths, could be avoided with efficient emergency response strategies, advance planning and early warning systems. Therefore, this research aims to delimit flooding areas in the stretch of the Poti River, which is located in the urban area of ​​Teresina, in Times of Recurrence (TR) of 2, 3, 5, 10, 20, 50 and 100 years, from the hydraulic model HEC-RAS combined with GIS tools. As a result of the flow simulations, we obtain the following values: 1138.92 m3/s/TR 2; 1509.03 m3/s/TR 3; 1921.24 m3/s/TR 5; 2439.20 m3/s/TR 10; 2936.04 m3/s/TR 20; 3579.156 m3/s/TR 50; 4061.076 m3/s/TR 100. The simulations carried out in this research show us that, despite some limitations, it was satisfactory considering the purposes of the study. According to the simulations carried out, we can conclude that, in order to represent the flooded areas in greater detail, more observations of the floods are necessary.