RT journal article T1 Engineering Lessons from Four Decades of Beach Nourishment in Spain: A Review of Quality Control, Monitoring and Adaptive Coastal Management A1 Contreras-de-Villar, Antonio A1 Poullet, Patricio A1 Garcia-Lopez, Santiago A1 Martell, Raul A1 Contreras de Villar, Francisco A1 Jigena Antelo, Bismarck A1 Muñoz-Perez, Juan J. A2 Física Aplicada A2 Ingeniería Industrial e Ingeniería Civil A2 Ciencias de la Tierra A2 Ciencias y Técnicas de la Navegación y Construcciones Navales K1 beach nourishment; coastal sediment management; quality control; adaptive coastal management; coastal monitoring; UAV surveying; beach restoration AB Beach nourishment has become one of the principal soft-engineering strategies for mitigating coastal erosion while preserving the recreational, environmental and protective functions of sandy beaches. During the last four decades, Spain has accumulated extensive experience in beach nourishment, with annual nourishment volumes approaching 10 million m3 under a wide range of coastal settings. Many of the best-documented engineering examples originate from the Gulf of Cadiz, although the lessons synthesized here are interpreted within the broader context of Spanish coastal practice. This structured narrative review combines publications retrieved from Web of Science and Google Scholar with Spanish technical reports, project records, and institutional sources. It focuses on borrow-area characterization, sediment compatibility, construction quality control, post-nourishment monitoring, and adaptive management. Rather than providing a chronological description of nourishment projects, this review examines how repeated project implementation, monitoring and maintenance have progressively reduced uncertainty and improved engineering practice. Long-term nourishment performance is controlled more by sediment compatibility, local morphodynamics, and construction quality than by the total sediment volume placed. It also demonstrates that systematic monitoring provides the feedback required to improve future project design, optimize maintenance strategies and support evidence-based coastal management. The principal contribution of four decades of Spanish beach nourishment has been the progressive development of an engineering framework in which quality control, long-term monitoring and accumulated field experience continuously refine project planning and management. Although derived from Spanish practice, the lessons synthesized are broadly applicable to nourishment programs facing increasing pressures from climate change, sediment scarcity and growing environmental constraints. PB MDPI SN 2077-1312 YR 2026 FD 2026-07-30 LK http://hdl.handle.net/10498/40142 UL http://hdl.handle.net/10498/40142 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 06-nov-2026