Analysis of a Antropic Influences in a Floodplain (PAP014904)
Maria Cristina Santana Pereira, JOSE RODOLFO SCARATI MARTINS, Rodrigo Martins Lucci, LUIZ FERNANDO ORSINI DE LIMA YAZAKI
Land use and Floods, landslides and erosion
Floodplain are lateral areas that receives the excess of rivers during floods and were, originally occupied by vegetation or dunes. In the urban environs, those areas were replaced by buildings and other impervious structures, converting natural events in source of losses and public calamity This paper presents a case study where changes in the river behavior in terms of water level, caused by antropic influence as civil works, dredging and urban occupation are correlated. The study area is located on the on the left bank of Turvo River, São Luiz do Paratinga / SP - Brazil and the interventions that affected the river behavior were generated by the use the floodlain areas to store civil works disposals in the city rebuilding process, after the rainfall events that caused critical flooding in January 2010 and devastated the city. Analyzing resulting water profiles computed through an hydrodynamic model, it was possible to verify the influence of the disposal areas in river runoff and establish the maximum area that could be used for that activities to avoid damages. This way, this study concludes with and remarks the need for preservation of floodplains or valley bottom of urban water bodies.