RT journal article T1 A new and more accurate overfill ratio for beach nourishments and its comparison with James' RA A1 Contreras de Villar, Antonio A1 Pranzini, Enzo A1 Anfuso Melfi, Giorgio A1 Muñoz Pérez, Juan José A2 Ciencias de la Tierra A2 Física Aplicada A2 Ingeniería Industrial e Ingeniería Civil K1 Borrow sediment K1 Fill stability K1 Granulometric parameters K1 Sand size K1 beach nourishment AB Pranzini et al. (2018) designed a method, for borrowed sediment selection in beach nourishment projects, that solved the problems inherent to James' abacus (1975). However, it suffered in turn from the lack of an overfill ratio. A new and more accurate methodology is presented here to calculate the mentioned ratio. To demonstrate the implications of the new proposed method, the overfill ratios calculated are compared with those obtained using the method of James (RA) for nine beaches and nourished sands with different granulometries. The comparison showed that the method of James (1975) predicted a much larger fraction of the borrow sediment to be unstable, thus requiring higher nourishment volumes to achieve a certain beach width and implying increased economic costs. PB Elsevier SN 0025-3227 YR 2026 FD 2026-01-06 LK http://hdl.handle.net/10498/38338 UL http://hdl.handle.net/10498/38338 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 06-nov-2026