Understanding the dynamics of deposition in alluvial rivers near to different cuestiform sectors in the Paulista Peripheral Depression

• Grant number: 23/18273-5
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: May 01, 2024
• End date: April 30, 2026
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Physical Geography
• Principal Investigator: Fabiano Tomazini da Conceição
• Grantee: Vinícius Borges Moreira
• Host Institution: Instituto de Geociências e Ciências Exatas (IGCE). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil

Abstract

Rivers are efficient indicators of environmental changes on the most diverse temporal and spatial scales, as river dynamics respond and record, through the disposition of their sediments/erosive processes, any and all deformation of the earth's crust, lithology change, climate fluctuations and/or land use changes. In this way, studies aimed at dating sediments in the alluvial rivers and analyzing the depositional rate associated with modeling soil loss and sediment delivery rate, help to advance the understanding of processes that gave rise to and modified the dynamic balance of these river channels. Therefore, it is necessary to understand which structures or phenomena, natural/anthropogenic, are responsible for the differentiated depositional processes in alluvial rivers. this unprecedented hypothesis of project is that geomorphological surfaces directly influence in deposition rate of the rivers that drain the cuestiform sector, as was as land use changes over time. This hypothesis is suggested by the altimetric variation observed in DEMs, as well as orbital images and past work that indicate this path of investigation for the Corumbataí River basin. Thus, this project presents as a methodological resource morphometric analysis for precise identification of structures along the longitudinal profile of rivers, application of the RUSLE model to estimate rates and areas of soil loss, monitoring of sediment delivery in the river channel, dating and quantification of depositional rates per 210Pb in different sectors of the longitudinal profile to validate the proposal's hypothesis, being an important advance in understanding the influence of relief and human action on the dynamics of rivers in this geomorphological context.