## 3 Results
### Local Morphodynamics  
Of the 52 beach segments obtained through beach line simplification (Figure 8), 3 were not analysed because they represented hard defence structures without a beach (i.e., the southern face of the Praia de Canide groyne (Figure 1b), segment 14, and the two faces of the Aguda breakwater (Figure 1c, segments 41 and 42). In the northern part, segments 1 to 7 were predominantly rocky (Figure 1a), with slopes between \(7.6^{\circ}\) and \(20.9^{\circ}\), with a mean slope of \(10.6^{\circ}\). To the south, from segment 8 to segment 52, the beaches were sandy with rocky outcrops and slopes between \(2.1^{\circ}\) and \(7.9^{\circ}\), with a mean slope of \(5.1^{\circ}\). Considering a decade (Table 1), sediment budgets and shoreline dynamics varied spatially (Figure 9). Segments showed sedimentary budgets ranging from losses of \(213.8\) m\({}^{3}\) to gains of \(417.0\) m\({}^{3}\) per linear meter of coast and shoreline dynamics ranging from \(24.0\) m regression to \(51.5\) m progradation. Stretches with relatively stable morphology and others with erosional or accretional trends were found, depending on beach type, shoreline orientation and the presence of defence structures. Rocky beaches (segments 1-7) were the least dynamic. Sandy beaches were the most dynamic, with mean shoreline position changes of \(0.0\) m and \(-3.4\) m, respectively, and mean sediment budgets of \(-1.1\) m\({}^{3}\) and \(-2.9\) m\({}^{3}\), respectively, per linear meter of coastline and for the studied decade. However, two zones of sandy segments could be distinguished as segments with varying erosional trends in the north and centre of the study area (8-39) and segments with accretional trends in the south (40-52). Patterns differed, however, for the two 5-year periods comprising the decade, except for the northern rocky segments, which remained relatively stable throughout. The accretion in the most southern segments (40-52) and the erosion in the northern sandy segments (12-20) took place during the first 5 years. The erosion of the central-southern segments (24-40) occurred during the second 5 years. The three yearly periods analysed showed a spatial variability similar to the decadal period, with sediment budgets between \(-243.7\) m\({}^{3}\) and \(377.9\) m\({}^{3}\) per linear meter and shoreline changes between \(-29.3\) m and \(30.7\) m. There was a marked interannual variability (Figure 10). The first year (2008/2009) showed accretion for most segments, except for the rocky northern segments and the two most southern segments, which lost volume and retreated. The behaviour in terms of volume was not always analogous to the shoreline change. The second (2009/2010) and third (2018/2019) years analysed showed patterns that were more similar to the decadal pattern. The northern rocky segments were followed by predominantly eroding segments and a few accretionary southern segments, although there was some variability in the central part during the second year. The seasonal analysis (Figure 11) showed a first overall accretional winter with a pattern similar to that of the first year, followed by a rather stable summer season, marked by accretion in some southern segments (40-44, 50-52). The second winter, however, displayed much more variability, with some central-zone segments losing a lot of volume. Seasons showed segments with sediment budgets between \(-264.3\) m\({}^{3}\) and \(301.6\) m\({}^{3}\) per linear meter and shoreline changes between \(-26.1\) m and \(27.1\) m.  
Analysis of the segments per beach type and segment orientation (Figures 12-14), confirmed that rocky beaches presented less sedimentary dynamics in general than sandy beaches, as expected, independently of their orientation. Over the 10-year period and on average, rocky segments lost 1.1 m\({}^{3}\) of volume per linear meter (SD = 1.7) and did not change their shoreline position (change = 0.0 m, SD = 1.7). Sandy segments lost 2.9 m\({}^{3}\) of volume per linear meter (SD = 117.6) and retreated 3.4 m (SD = 10.7).