The effects of a bypass dunefield on the stability of a headland bay beach: A case study

Headland Sediment Bypassing and Overpassing: Examples From Southern Brazil

“…Two dunes within the dune system were evaluated, these dunes stored about 51,000m³ and 87,000m³ of sediments; in 2014 their dune crests migrated 16-18m/year, which represents sediment input to Ingleses beach was of between 3,000-5,000m³/year. These rates were half of rates published by Boeyinga et al (2010) who calculated that the dunefield contributed around 10,000 m 3 /year of sediment to Ingleses. These authors used the length and the angle of the slip face to estimate the sediment volume, whereas this study used a more accurate topographic (GPS) survey method.…”

“…It has a Relative Tide Range (RTR) of ~1 and is predominately a wave-dominated coast (Klein and Menezes 2004). However, as presented by Klein and Menezes (2004), Vieira da Silva et al (2016b) and Klein et al (2010Klein et al ( , 2016 when breaker wave height (Hb) is lower than 0.4 m it becomes tide-modified. This scenario usually does not occur at the exposed east-facing beaches in the study area but it is common along the protected north-facing area.…”

Wave-driven sediment transport and beach-dune dynamics in a headland bay beach

“…Boeyinga et al (2010) assumed a maximum closure depth of about 6 m along Ingleses beach, adjacent to Moçambique to the north. If that is the case also for the northern part of Moçambique beach (which is composed by grain sizes similar to Ingleses), then the northern headland projects beyond the closure depth and sediment bypass around it is not expected (Boeyinga et al, 2010). The northern part of the embayment is where the beach is wide, stable, the surf Fig.…”

Shoreline Change Analysis and Insight into the Sediment Transport Path along Santa Catarina Island North Shore, Brazil

“…It has been shown that a reduction in sand input from the Santinho dunefield to Ingleses Beach has led to a retreat of the Ingleses shoreline that may indicate that it is losing sediment downdrift (northward -eventually to Brava). According to Boeyinga et al (2010), Santinho Beach is supplying a dunefield that migrates northward and delivers 10,000 m3 y_1 to Ingleses Beach via headland overpassing. Pinto et al (2015) found that the migration rate of the dunefield has decreased during the Ingleses, which is now retreating.…”

“…^Corresponding author: oc.guilhermevs@gmail.com ®Coastal Education and Research Foundation, Inc. 2016 Despite being bounded by headlands or man-made structures, embayed beaches are very dynamic, presenting a seasonal or event-related variation in width, morphodynamic state and orientation (beach rotation process) (Harley et al ., 2014;Klein, Benedet Filho, and Schumacher, 2002;Masselink and Pattiaratch, 2001;Ojeda and Guillen, 2008;Ranasinghe et al ., 2004;Short et aly 1995;Short and Masselink, 1999;Turki et al, 2013). Because of their physical limits, embayed beaches and beaches bounded by hydrodynamic obstacles (such as inlets) have frequently been considered closed systems (without significant input/output of sediment), although several studies have reported obstacles bypassing and overpassing (Ab Razak et al ., 2013;Boeyinga et al ., 2010;Cheung, Gerritsen, and Cleveringa, 2007;Eslami et al, 2010;Fitzgerald, Krauss, and Hands, 2000;FitzGerald and Pendleton, 2002;Goodwin, Freeman, and Blackmore, 2013;Mariani, Carley, and Miller, 2010;Short and Masselink, 1999;Silvester, 1985). A conceptual model of headland bypassing was presented by Short and Masselink (1999).…”