The impact of beach nourishment and replenishment practices on benthic biocenoses along the Croatian coast

Cilj diplomskog rada bio je utvrditi promjene pridnenih taložnih okoliša i asociranih biocenoza nakon prakse nasipavanja i dohranjivanja plaža na šest lokacija hrvatske obale. Za to su istraživanje korištene metode analiza veličine zrna sedimenta, određivanje udjela karbonata u sedimentu, određivanje udjela organske tvari i analiza sastava i stanja pridnenih biocenoza. Procijenilo se stanje pridnenih biocenoza, ocijenila prikladnost materijala za nasipavanje, a i predložene su smjernice za korekciju budućih zahvata nasipavanja i dohranjivanja. Na 3 od ukupno 6 istraživanih plaža vidljiv je utjecaj provedene prakse. Na morskom dnu kod plaža Osejava i Podgora radi se o negativnom utjecaju dok je na Žnjanu utjecaj relativno pozitivan. Za morsko dno kod plaže u Omišu, Bratušu i Promajni nije vidljiv utjecaj prakse te su potrebna dodatna istraživanja.The aim of the thesis was to determine changes in sedimentary environments and associated biocenoses after the beach nourishment and replenishment on six locations on the Croatian coast. For this purpose, sediment grain size, carbonate content in sediment, organic matter content and composition and condition of benthic biocenoses were analyzed. The condition of benthic biocenoses and the suitability of the material for the practice were assessed and guidelines for the correction of future practice were proposed. On 3 of the 6 researched beaches the impact of practice is visible. The sea bottom near Osejava and Podgora are under negative impact while Žnjan is under relatively positive impact. For the seabed near beaches in Omiš, Bratuš and Promajna the impact of the practice is not visible and additional research is needed