Effect of a small Southern California lagoon entrance on adjacent beaches

Elwany, M. Hany S.; Flick, Reinhard E.; Hamilton, M.

doi:10.1007/bf02711981

Cited by 16 publications

(9 citation statements)

References 3 publications

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“…Over 40 estuaries, characterized by low volume and intermittent freshwater inflow, line the Southern California study area (Elwany et al, , ; Largier, ; Largier et al, , ). The inlets are exposed to waves that affect their morphodynamics and make them prone to mouth migration and intermittent mouth closure (e.g., Moreno et al, ; Zedler, ).…”

Section: Southern California Study Regionmentioning

confidence: 99%

“…Regional urbanization and infrastructure development have significantly altered the coast and reduced terrestrial sand yield. Over 40 estuaries, characterized by low volume and intermittent freshwater inflow, line the Southern California study area (Elwany et al, 1998(Elwany et al, , 2003Largier, 2010;Largier et al, 1996Largier et al, , 1997. The inlets are exposed to waves that affect their morphodynamics and make them prone to mouth migration and intermittent mouth closure (e.g., Moreno et al, 2010;Zedler, 2010).…”

Section: Southern California Study Regionmentioning

confidence: 99%

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Southern California Coastal Response to the 2015–2016 El Niño

et al. 2018

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Widespread erosion associated with energetic waves of the strong 2015–2016 El Niño on the U.S. West Coast has been reported widely. However, Southern California was often sheltered from the northerly approach direction of the offshore waves. The few large swells that reached Southern California were not synchronous with the highest tides. Although west coast‐wide tidal anomalies were relatively large in 2015–2016, in Southern California, total water levels (sum of tides, anomalies, and wave superelevation) were lower than during the 1997–1998 Niño, and comparable to the 2009–2010 Niño. Airborne lidar surveys spanning 300 km of Southern California coast show the beach response varied from considerable erosion to accretion. On average, the shoreline moved landward 10 m, similar to the 2009–2010 El Niño. Some San Diego county beaches were narrower in the 1997–1998 El Niño than in 2015–2016, consistent with the higher erosion potential in 1997–1998. Beach retreat exceeded 80 m at a few locations. However, 27% of the shoreline accreted, often in pocket beaches, or near jetties. While adjacent beaches eroded, estuary mouths accreted slightly, and several estuaries remained or became closed during the study period. Only 12% of cliffs eroded (mostly at the base), and the average cliff face retreat was markedly less than historical values. Only two cliff‐top areas retreated significantly. Although some areas experienced significant change, the potential for coastal erosion and damage in Southern California was reduced compared to the 1997–1998 El Niño, because of low rainfall, a northerly swell approach, and relatively limited total high‐water levels.

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Section: Southern California Study Regionmentioning

confidence: 99%

Section: Southern California Study Regionmentioning

confidence: 99%

Southern California Coastal Response to the 2015–2016 El Niño

et al. 2018

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“…Human uses of intermittently open estuaries, foreshore property developments, and community expectations have led management authorities in Australia (Roy et al, 2001), Brazil (Saad et al 2002), South Africa (Bally, 1987), and the United States (Elwany et al, 2003) to intervene in the natural dynamics of these estuarine ecosystems. The entrance barriers of intermittently open estuaries are artificially breached to improve water quality, recreational amenity and fishing opportunities, and to prevent flooding of adjacent property (Kok & Whitfield, 1986;Potter, 1990;Kjerfve, 1994;Whitfield, 1999;Roy et al, 2001;Healthy Rivers Commission, 2002;Pinto & Teixeira, 2002;Saad et al 2002;Suzuki et al 2002;Elwany et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Effects of artificial openings of intermittently opening estuaries on macroinvertebrate assemblages of the entrance barrier

Gladstone

Hacking

Owen

2006

Estuarine, Coastal and Shelf Science

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Intermittently opening estuaries are artificially opened to manage flood risk, water quality, recreational amenity, and fisheries; however, the ecological impacts of this management technique are incompletely understood. During 2001 and 2004, this study assessed the impacts of artificial openings on the macroinvertebrates of entrance barriers of intermittently opening estuaries in New South Wales (Australia). In 2001 macroinvertebrates were sampled once before artificial opening and 9 d and 25 d after reformation of the entrance barrier. A multiple before-after-control-impact analysis found that, although entrance barriers were destroyed by the artificial openings and then reformed naturally by wave action, significant interactions for taxonomic richness, density of the amphipod Paracalliope australis (Gammaridae) and density of the gastropod mollusc Aschoris victoriae (Hydrobiidae) meant that the effects of this disturbance could not be distinguished from the natural variations that occurred in unopened estuaries. Multivariate analyses found that assemblages at both opened and unopened estuaries changed from before to after the openings, and the magnitude of the dissimilarity between times varied between estuaries. In 2004, macroinvertebrates were sampled on 3 randomly selected days within each of 3 periods (before, 3 d and 42 d after) at 1 opened and 3 unopened estuaries. Asymmetrical analysis of this modified before-after-control-impact study found that the change in taxonomic richness at the opened estuary from before to after opening did not differ from temporal changes that occurred in unopened estuaries. Short-term variation (i.e. between days) in total density of macroinvertebrates and density of P. australis in the reformed entrance barrier of the opened estuary also did not differ from the variation in the control estuaries. Additionally, assemblage structure was not significantly changed by the opening and assemblages at two control estuaries were also unchanged over the same time. Individual taxa and assemblages of macroinvertebrates in entrance barriers of these intermittently open estuarine systems appear to be resilient to the habitat disturbance caused by artificial openings.

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“…TOCEs can also be found in South America (Bonilla et al 2005), parts of North America (Elwany et al 2003), the Mediterranean, the south-eastern and south-western coasts of Australia and New Zealand (Haines and Thom 2007) and the south-eastern coasts of India and Sri Lanka (Ranasinghe and Pattiaratchi 2003). They are also referred to as intermittently closed and open lakes and lagoons (ICOLLs), a term used mainly in Australia (Haines and Thom 2007), and as bar-built estuaries, perched estuaries or blind estuaries (Tagliapietra et al 2009;).…”

mentioning

confidence: 98%

Responses of primary producers to mouth closure in the temporarily open/closed Great Brak Estuary in the warm-temperate region of South Africa

Nunes

Adams

2014

African Journal of Aquatic Science

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Low river inflow conditions during 2009/2010 resulted in the mouth of the Great Brak Estuary remaining closed for almost two years. The low water level in Wolwedans Dam resulted in no annual environmental flow releases being made, causing mouth closure. The response of primary producers to this prolonged period of mouth closure was investigated in 2010/2011. Urban and agricultural development in the river catchment and along the estuary banks had increased the nutrient inputs into the estuary. Mouth closure, combined with elevated nutrient concentrations, increased the growth of both macroalgae and microalgae, but little change was observed in the submerged macrophytes. Macroalgal mats covered large areas of open-water surface, smothering the salt marsh and causing a decrease in its cover. These results have important implications for the management of temporarily open/closed estuaries, as increased development, freshwater abstraction and reduced river flow will result in prolonged periods of closure and reduced tidal exchange, which is likely to lead to eutrophication.

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Effect of a small Southern California lagoon entrance on adjacent beaches

Cited by 16 publications

References 3 publications

Southern California Coastal Response to the 2015–2016 El Niño

Southern California Coastal Response to the 2015–2016 El Niño

Effects of artificial openings of intermittently opening estuaries on macroinvertebrate assemblages of the entrance barrier

Responses of primary producers to mouth closure in the temporarily open/closed Great Brak Estuary in the warm-temperate region of South Africa

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