Diachronic spatial analysis: the case of floods in the Luján River, Argentina. (#1713)

Authors

Di Franco, Leonardo Alfredo

Guerrero Rodríguez, Ariel Fabricio

Borda Prada, Lucia Olga

Abstract

Mapping flooded areas plays a crucial role in the formulation of territorial policies aimed at disaster prevention, offering valuable information to decision makers. The use of data collected by sensors on satellite platforms stands out as a powerful source, especially considering the existence of archives with more than four decades of global information. This study focuses on the Luján River basin, in the province of Buenos Aires, Argentina, recognized for its periodic flooding and its significant impacts on people, property and services. The main objective of this research is to generate a historical spatial study based on satellite information provided by medium spatial resolution sensors. For this, a 30-year time window was selected that included the period with the greatest flooding in the upper and middle basin of the river. To do this, several water indices proposed in the literature were evaluated, adapting thresholds to create binary masks in each selected image. The methodological approach used free software, promoting the democratization of information, especially in municipalities with budget limitations. The results obtained include the generation of synthesis cartography, the quantification of the affected surface and the determination of the probability of impact in different sectors of the basin. In this way, a fundamental resource is valued for both the industry and the public sector and an invaluable source of data for understanding territorial dynamics.