Title: Intra-annual coastal dynamics through remote sensors and photogrammetry morph sedimentary patterns, Renaca beach, Central Chile

Biography:

Idania Briceno is a geographer graduated from Los Andes University, Merida, Venezuela, with 19 years of experience. She is pursuing a master of science degree in spa al analysis and territory management at the Central University of Venezuela (thesis in progress), Master degree in remote sensing. 

Abstract

The Renaca Beach, located in the Valparaíso Region, Central Chile, is a place of special interest to understand the influence of oceanic, atmospheric and anthropic agents in the coastal dynamics. This study aims to determine the evolution of the coastal area, with survey studies were carried out with a differential GPS according to the revisit dates of the Landsat 8 satellite and photogrammetry to obtain accurate information of beaches and characterize evolutionary trends along the coast of Chile. In addition, the shoreline was automatically extracted with SHOREX, using images captured from the same satellite, considering data from January 2016 to December 2018. Sedimentological analyzes with transversal beach profiles were also carried out. Samples for season’s summer were collected in the profile. These samples were sieved and granulometric curves were constructed. In addition, oceanographic data for tide and wave height were compiled for the Landsat 8 satellite revisit dates. Also, a high-definition digital elevation model was generated from images captured by DRONE. The preliminary results show that the coastline advances landwards in winter and seawards in summer. The shoreline extracted with SHOREX provides a quantitative description of the short-term change (measured in three years), and the seasonal change in the coastline. In addition, sediment transport is dominated by saltation at the beginning of summer, while the dominant transport is saltation and suspension at the beginning of autumn. The variability will depend on the intensity of the dynamic agents that are present, be it wind, waves, tides, and the recurrence of extreme weather events such as storms. Continuous monitoring is vital for coastal use policy generation, as well as for the local management of coastal resources.