HOW IMPORTANT ARE SEDIMENT BUDGET ESTIMATES FOR SHORELINE PROJECTIONS UNDER RISING SEA LEVELS?

This study examines coastal dynamics along the central-southern coast of Rio Grande do Sul (RS), focusing on the interaction between the sediment budget (SB) and sea-level rise (SLR). Using the RanSTM model, the morphological response of the region to SLR was simulated. Calibration employed SB data estimated at different temporal scales: annual (DRONE surveys), decadal (satellite imagery), and long-term (stratigraphy and geophysics).本研究针对巴西南大河州（Rio Grande do Sul, RS）中南部海岸的海岸动力过程开展研究，重点探讨泥沙收支（sediment budget, SB）与海平面上升（sea-level rise, SLR）之间的相互作用。研究采用RanSTM模型，模拟了该区域对海平面上升的地貌响应。模型校准阶段采用了不同时间尺度下估算的泥沙收支数据：年度尺度（无人机（DRONE）勘测）、十年尺度（卫星影像）以及长期尺度（地层学与地球物理探测）。