Long-term evolution of a transgressive migrating dune using reconstruction of the EOF method

Muñoz-Pérez, Juan J.; Navarro, Marina; Román-Sierra, Jorge; Tejedor, B.; Rodríguez, Inmaculada; Gómez-Pina, Gregorio

doi:10.1016/j.geomorph.2009.05.016

Cited by 22 publications

(20 citation statements)

References 37 publications

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“…This feature causes the deflection of river channels, which act as traps interfering with the littoral drift coming northwards from sand accumulations located south of the zone (Muñoz-Pérez et al 2009). In particular, Valdevaqueros dune is bounded by the mouth of the Valle River to its east, which forms a small estuary whose position migrates seasonally along the beach as a function of the rainfall climate.…”

Section: Features Of the Dune Environmentmentioning

confidence: 99%

“…The first period, from 1995 to 2000, which is considered as the "initial" profile, shows a uniform and progressive accretion of 480 m 3 m -1 yr -1 (Muñoz-Pérez et al 2009), in which orography plays a very important role. In this stage, the windward side of the dune had a more convex slope, becoming sharper as the dune profile was softened by mechanical action just before 2003.…”

Section: Valdevaqueros Dune Evolutionmentioning

confidence: 99%

“…Dune elevation also obviously increased in proximity to the sand fencing, and after the sand reached the road in 2004, the dune experienced shifting morphologies (not only on the crest but also on the windward and leeward sides), resulting in a more complex profile. Based on observations of the dune behaviour in recent years, an average advance rate of profile V1 was calculated as 17.5 m yr -1 (Muñoz-Pérez et al 2009). In addition, after considering the "natural" transport rate experienced by profile V1 (taking into account the extracted sand volume and the remaining natural dune volume), it was concluded that only 2-3 weeks of moderate easterly winds (of approximately 40 km h -1 ) would be required to move as much sand volume as during one of the prior years.…”

Section: Valdevaqueros Dune Evolutionmentioning

confidence: 99%

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Evidence of coastal dune mobility increases over the last half century in response to historical human intervention

et al. 2016

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Summary:Given the risk of two roads being buried by the sand of two highly mobile coastal dunes (Valdevaqueros and Bolonia, SW Spain), several measures have been taken over the last half century in order to stabilize them or at least slow their progress: installation of several rows of 1-m-high concrete structures, planting of species such as Pinus pinea, Retama monosperma and Ammophila arenaria, wicker and wooden fencing, and sand mining (only performed on the Valdevaqueros dunefield). The evolution of the two dunes was investigated through the interpretation of intensive topographical monitoring and aerial photography. Average migration rates of approximately 10 m yr -1 were detected and the burial of anthropic structures has eventually occurred. This process has caused a serious regional problem, making dune management of these areas a difficult challenge. The comparison of the evolution of these two dunes has been of great importance in assessing the effect of historical human intervention and has provided a new perspective for future dune management strategies. The results obtained show that management measures based on sand removal have been proven to be unsustainable. Moreover, the monitoring methodology presented herein has proven very useful in predicting dune advance rates. For instance, the Bolonia dune could reach the nearest road in approximately 12 years.Keywords: coastal dunes, dune mobility; aeolian transport rate; topographic monitoring; aerial photography; dune management; dune evolution.Evidencias del incremento en la movilidad de dunas costeras en el último medio siglo como respuesta a la intervención humana Resumen: Se han tomado diferentes medidas a lo largo del último medio siglo tratando de estabilizar o al menos ralentizar el progreso de dos dunas costeras de alta movilidad (Valdevaqueros y Bolonia, SW España) dado el riesgo de enterramiento de sendas carreteras: Entre las medidas tomadas cabe destacar la instalación de filas de estructuras de hormigón de 1 m de altura, la plantación de diferentes especies (como el Pinus pinea, la Retama monosperma o la Ammophila arenaria), vallas de madera y brezo, y la extracción de arena (sólo en la duna de Valdevaqueros). La evolución de ambas dunas se ha investigado a través de la comparación de levantamientos topográficos y fotografías aéreas. Se han detectado tasas medias de avance de aproximadamente 10 m/año hasta que, finalmente, se han enterrado estructuras antrópicas. Este proceso ha causado graves problemas convirtiendo en un difícil reto la gestión de dunas de estas áreas. La comparación de la evolución de estas dos dunas ha resultado de gran importancia a la hora de evaluar el efecto de la intervención humana, y ha proporcionado una nueva perspectiva para las futuras estrategias de gestión. Entre los resultados obtenidos, debería destacarse el que la gestión basada en la retirada de arena ha resultado insostenible. Además, la metodología de seguimiento aquí presentada ha probado ser de gran utilidad al predecir las tasas de avance de las du...

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Section: Features Of the Dune Environmentmentioning

confidence: 99%

Section: Valdevaqueros Dune Evolutionmentioning

confidence: 99%

Section: Valdevaqueros Dune Evolutionmentioning

confidence: 99%

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Evidence of coastal dune mobility increases over the last half century in response to historical human intervention

et al. 2016

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“…Unfortunately, the lack of sandbanks off the southwestern Spanish coast has been an ongoing problem for beach nourishment, even with the existence of dunes with an excess sand supply (Muñoz-Perez et al 2009), because of the unprofitable sand-transport costs. This handicap led to the need to find new, alternative sources of sand.…”

Section: Introductionmentioning

confidence: 99%

Turbidity and Other Effects Resulting from Trafalgar Sandbank Dredging and Palmar Beach Nourishment

Román-Sierra

Navarro

Muñoz-Pérez

et al. 2011

J. Waterway, Port, Coastal, Ocean Eng.

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Beach-nourishment requirements on the southwestern Spanish coast have led to a significant increase in offshore dredging. Following a new research line, assessment of changes recorded in physicochemical and biological parameters due to dredging and dumping operations was performed at the Cape of Trafalgar and Palmar Beach during June and July 2008. Turbidity, salinity, pH, dissolved oxygen, temperature, and suspended-sediment data were collected at 10 stations. At the end of the study, a three-campaign monitoring program was implemented for 1 year to assess the possible effects on biological communities and sediment properties. The relevant results, such as the average extent of the sediment plume (< 400 m) and its persistence in the environment (< 10 min), are discussed in this paper. A precise correlation between turbidity and suspended sediments and the recovery time of ecological balance were also established. Furthermore, minimal and reversible effects caused by dredging and dumping operations in this type of marine environment were identified.

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“…A noteworthy example of this can be found in the active coastal dune of Valdevaqueros (SW Spain), which is continuously invading the only road to an adjacent village. In fact, high rates of advance (an average value of 17.5 m year − 1 , to a maximum of 38 m year − 1 ) were identified by Muñoz-Pérez et al (2009) in spite of sand extractions carried out during recent years. Within one month, the dunefield buried a 1 m-high fence at the top of the dune.…”

Section: Introductionmentioning

confidence: 99%

Assessment of highly active dune mobility in the medium, short and very short term

et al. 2011

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Long-term evolution of a transgressive migrating dune using reconstruction of the EOF method

Cited by 22 publications

References 37 publications

Evidence of coastal dune mobility increases over the last half century in response to historical human intervention

Evidence of coastal dune mobility increases over the last half century in response to historical human intervention

Turbidity and Other Effects Resulting from Trafalgar Sandbank Dredging and Palmar Beach Nourishment

Assessment of highly active dune mobility in the medium, short and very short term

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