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The experiments featured velocity\u2010asymmetric flows with a consistent wave period of 7\u2009s, while considering two distinct wave heights (1 and 1.5\u2009m). The sand mixtures were derived from two well\u2010sorted grain\u2010size fractions: a fine (F) sand with a median diameter of 0.21\u2009mm and a coarse (C) sand with a median diameter of 0.58\u2009mm. This study scrutinises the bed composition of three bimodal graded sands, initially composed of 75%, 50% and 25% fine fractions. Sand characteristic analyses were performed using a Laser Diffraction Particle Size Analyser, enabling precise counting and sizing of particles in heterometric sands. Over time, the initially well\u2010mixed bed composition undergoes alterations, revealing a vertical segregation of mixed sands at the bed layer. Distinct behaviours emerge in the different fractional experiments. For the sand mixture with a higher percentage of coarse sand fraction, a gradual increase in the maximum percentages of coarse sands is observed, particularly in the upper layers (upward coarsening). Conversely, with a higher percentage of fine sands, a discernible trend is noted where finer sands tend to occupy the superficial layers, while coarser sands predominate in the deeper layers (upward fining).<\/jats:p>","DOI":"10.1111\/sed.70052","type":"journal-article","created":{"date-parts":[[2025,11,4]],"date-time":"2025-11-04T08:35:21Z","timestamp":1762245321000},"page":"123-146","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Experimental observations of vertical segregation of sands in oscillatory flows"],"prefix":"10.1111","volume":"73","author":[{"given":"Tiago","family":"Abreu","sequence":"first","affiliation":[{"name":"CESAM &amp; ISEP, Polytechnic of Porto  Porto Portugal"}]},{"given":"Caroline C.","family":"Ferreira","sequence":"additional","affiliation":[{"name":"Dom Luiz Institute (IDL) &amp; Oceanic Observatoty of Madeira, ARDITI  Funchal Portugal"}]},{"given":"Jo\u00e3o","family":"Matos","sequence":"additional","affiliation":[{"name":"ISEP, Polytechnic of Porto  Porto Portugal"}]},{"given":"Paulo A.","family":"Silva","sequence":"additional","affiliation":[{"name":"CESAM &amp; University of Aveiro  Aveiro Portugal"}]},{"given":"Ana M.","family":"Bernabeu","sequence":"additional","affiliation":[{"name":"CIM\u2010UVIGO GEOMA, University of Vigo  Vigo Spain"}]}],"member":"311","published-online":{"date-parts":[[2025,11,4]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1142\/S0578563403000798"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1080\/14685240802089776"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1021\/es803209h"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/esp.261"},{"volume-title":"Dynamics and Transport of Sand Mixtures in Oscillatory Flows","year":"2022","author":"Boscia D.","key":"e_1_2_9_6_1"},{"key":"e_1_2_9_7_1","first-page":"40","article-title":"Textural characterization of the beach active layer","volume":"64","author":"Bosnic I.","year":"2011","journal-title":"J. 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