‘Low energy’ sandy beaches in marine and estuarine environments: a review

Jackson, Nancy L.; Nordstrom, Karl F.; Eliot, Ian; Masselink, Gerd

doi:10.1016/s0169-555x(02)00179-4

Cited by 167 publications

(145 citation statements)

References 22 publications

Supporting

Mentioning

113

Contrasting

Unclassified

Order By: Relevance

“…Indio Beach (27°28'33.90"S, 48°32'0.75"W) is sheltered from waves (Jackson et al, 2002) and faces northwest. The most important fluvial discharges in the vicinity come from the joint estuaries of the Ratones and Veríssimo rivers, which are located approximately 1.7 km from the collection site (Fig.…”

Section: Shallow Infralittoral Environment Of Indio Beachnorte Bay Fmentioning

confidence: 99%

Comparison of the temporal and taxonomic patterns of ichthyofauna captured with a fyke net in two sheltered environments in southern Brazil

Soeth¹,

Ribeiro²,

Spach³

et al. 2015

lajar

View full text Add to dashboard Cite

ABSTRACT. We use two taxonomic indexes to assess the variability of the taxonomic structure and diversity of the ichthyofauna of two low-energy environments in southern Brazil and to compare the temporal patterns of these two ichthyofaunas. Sampling was conducted in the infralittoral zones of Maciel (Paranaguá Bay, PR) and Indio Beach (Norte Bay of Florianópolis, SC). A fyke net was set up at a depth of 0.5 to 2.0 m and left in place for 48 h for each of the samplings. A total of two diurnal and two nocturnal samplings were conducted monthly per one year. The ichthyofaunas at the two sites exhibited similar temporal dynamics, with their abundance and biomass presenting a tendency to increase with increasing temperature during the spring and summer months. A total of 113 species were captured, of which 47 were present at both sites. Harengula clupeola, Sphoeroides testudineus and S. greeleyi were especially abundant at both sites. The co-occurring species displayed similar day and night occupancy trends. In all seasons, the obtained values for the average taxonomic distinctness and variation in taxonomic distinctness were within the confidence intervals. The seasonal reproduction and recruitment patterns led to slight changes in taxonomic distinctness during the year, which were within the expected intervals. Keywords: ichthyofauna, taxonomic distinctness, nycthemeral dynamics, sheltered beach, southern Brazil.Comparación de los patrones taxonómicos y temporales de la ictiofauna capturada con red fyke en dos ambientes protegidos en el sur de Brasil RESUMEN. Se utilizaron dos índices taxonómicos para evaluar la variabilidad de la estructura taxonómica y diversidad de la ictiofauna en dos ambientes de baja energía en el sur de Brasil, así como para comparar sus patrones temporales. Los muestreos se realizaron en las zonas infralitoral de Maciel (Bahía de Paranaguá, PR) e Indio Beach (Bahía Norte, SC). Se instaló una "fyke net" a una profundidad de 0,5 a 2 m, durante 48 h, para cada uno de los muestreos. Durante un año se realizó un total de dos muestreos diurnos y dos nocturnos. La ictiofauna en los dos sitios mostró dinámicas temporales similares, con su abundancia y biomasa presentando una tendencia a aumentar con el incremento de la temperatura durante los meses de primavera y verano. Un total de 113 especies fueron capturadas, de los cuales 47 estuvieron presentes en ambos sitios. Harengula clupeola, Sphoeroides testudineus y S. greeleyi fueron especialmente abundantes en ambos sitios. Las especies coexistentes mostraron tendencias similares de ocupación tanto de día como de noche. En todas las estaciones, los valores obtenidos para la distinción taxonómica media y para la variación en la distinción taxonómica estuvieron dentro de los intervalos de confianza. Los patrones de reproducción y reclutamiento estacionales llevaron a ligeros cambios en la distinción taxonómica durante el año, que estuvieron dentro de los intervalos esperados. Palabras clave: ictiofauna, distinción taxonómica, dinámica nictimeral, play...

show abstract

Section: Shallow Infralittoral Environment Of Indio Beachnorte Bay Fmentioning

confidence: 99%

Comparison of the temporal and taxonomic patterns of ichthyofauna captured with a fyke net in two sheltered environments in southern Brazil

Soeth¹,

Ribeiro²,

Spach³

et al. 2015

lajar

View full text Add to dashboard Cite

show abstract

“…Some of these investigations sought to confirm the validity of the model by rigorously analysing more objective and extensive data sets (Lippmann and Holman, 1990;Ranasinghe et al, 2004). Other follow-up studies presented alternative models more suitable for different types of environments; for example, multi-bar beaches (Short and Aagaard, 1993;Short, 1992), low-wave energy settings (Hegge et al, 1996;Jackson et al, 2002) and large tidal environments (Short, 1991;Masselink and Short, 1993;Masselink and Hegge, 1995). More recently, studies along rocky coasts and embayed beaches highlighted the role of geology in constraining beach morphological development (Jackson et al, 2005), invoking the identification of distinctly different beach state models for geologically-controlled beaches (Loureiro et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Role of wave forcing, storms and NAO in outer bar dynamics on a high-energy, macro-tidal beach

et al. 2014

View full text Add to dashboard Cite

Outer sand bar dynamics on a high-energy macro-tidal beach were investigated using long-term (multi-year) field datasets of intertidal morphology and offshore bathymetry. Utilising a 15-year time-series of Argus video images, five distinct outer bar types were identified: Mega Rip, Longshore, Crescentic, Crescentic Attached and Welded. The most common classification was Crescentic Attached, with the outer bar oscillations being out of phase with the inner bar oscillations, as would be expected for the shore-normal wave approach at this site. The outer bar had a typical amplitude of 0.5-1 m and a longshore wavelength of 600 m. Changes in outer bar morphology were related to measured and modelled nearshore wave data. However, the outer bar morphology changed over a much longer time scale (monthly-to-annual) than the daily-to-weekly variations in wave height and period. An extended duration of energetic wave action was required to bring about an upstate bar transition to the Longshore or Mega Rip state, where the bar then remained arrested for a significant amount of time, requiring several months of low wave conditions to induce a down state transition through Crescentic to Welded. This slow morphological response is explained by extended relaxation times attributed to the large tidal range at the study site where the outer bar morphology is only active for part of the tidal cycle (several hours around low tide). The configuration and position of the outer bar were related: the more upstate (downstate) bar types being associated with a more offshore (onshore) bar position. The detrended outer bar position was significantly related to a forcing term based on wave power and disequilibrium of the dimensionless fall velocity with offshore (onshore) bar migration occurring when wave conditions were more (less) energetic that the antecedent conditions. The upstate end member (Longshore or Mega Rip) was attained sometime during the winter months for 14 out of the 16 years of monitoring; the outer bar remained attached to the low tide shoreline over the winter 2005/2006 and 2010/2011. These two winters with incomplete upstate cycles were characterised by the lowest winter wave conditions and negative winter North Atlantic Oscillation (NAO) indices, suggesting that the winter NAO is correlated with both beach state and nearshore bar configuration. KEYWORDS

show abstract

“…They tend to be smaller and narrower, often sediment starved, and strongly influenced by littoral drift processes (Nordstrom, 1992, Jackson et al, 2002, Kennedy, 2002. Morphodynamics on fetch-limited estuarine beaches differ from open-ocean systems as they lack consistent energy input of long period swell waves (Masselink and Pattiaratchi, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…While it is widely accepted that the dominant open-ocean morphodynamic models, such as those of Wright and Short (1984) and Masselink and Short (1993), have limited applicability to estuarine beaches (Jackson et al, 2002, Nordstrom andJackson, 2012), applying the results of previous estuarine studies across multiple estuarine systems is also difficult. The substantial differences in boundary conditions, both between and within different estuaries, do not easily support extrapolation to different environments.…”

Section: Introductionmentioning

confidence: 99%