Morphological and statistical analysis of the impact of breakwaters under construction on a sand spit area (Douro River estuary)

Teodoro, Ana Cláudia; Taveira-Pinto, Francisco; Santos, Isaac R.

doi:10.1007/s11852-014-0306-3

Cited by 12 publications

(9 citation statements)

References 24 publications

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“…Its aim is to disperse wave energy and fix the sandspit to facilitate boat navigation in the Douro river mouth. As expected [87], there is an accumulation of sand in the sandspit. Its increase rate (that can be measured from the UAV data) can help in taking measures for the coastal engineering management of the area.…”

Section: Resultssupporting

confidence: 80%

“…Its dunes are crucial for preserving the dwellings situated on the coastline and those of the local population, as it prevents the Douro River banks being reached by waves. Moreover, there are financial interests in terms local business activities being run in the Douro River estuary navigation channel, and these are highly dependent upon the sandspit conservation [87].…”

Section: Cabedelo Sandspit Variation Assessmentmentioning

confidence: 99%

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Multi-Temporal Analysis of Forestry and Coastal Environments Using UASs

et al. 2017

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Due to strong improvements and developments achieved in the last decade, it is clear that applied research using remote sensing technology such as unmanned aerial vehicles (UAVs) can provide a flexible, efficient, non-destructive, and non-invasive means of acquiring geoscientific data, especially aerial imagery. Simultaneously, there has been an exponential increase in the development of sensors and instruments that can be installed in UAV platforms. By combining the aforementioned factors, unmanned aerial system (UAS) setups composed of UAVs, sensors, and ground control stations, have been increasingly used for remote sensing applications, with growing potential and abilities. This paper's overall goal is to identify advantages and challenges related to the use of UAVs for aerial imagery acquisition in forestry and coastal environments for preservation/prevention contexts. Moreover, the importance of monitoring these environments over time will be demonstrated. To achieve these goals, two case studies using UASs were conducted. The first focuses on phytosanitary problem detection and monitoring of chestnut tree health (Padrela region, Valpaços, Portugal). The acquired high-resolution imagery allowed for the identification of tree canopy cover decline by means of multi-temporal analysis. The second case study enabled the rigorous and non-evasive registry process of topographic changes that occurred in the sandspit of Cabedelo (Douro estuary, Porto, Portugal) in different time periods. The obtained results allow us to conclude that the UAS constitutes a low-cost, rigorous, and fairly autonomous form of remote sensing technology, capable of covering large geographical areas and acquiring high precision data to aid decision support systems in forestry preservation and coastal monitoring applications. Its swift evolution makes it a potential big player in remote sensing technologies today and in the near future.

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Section: Resultssupporting

confidence: 80%

Section: Cabedelo Sandspit Variation Assessmentmentioning

confidence: 99%

Multi-Temporal Analysis of Forestry and Coastal Environments Using UASs

et al. 2017

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“…A construção do quebra-mar destacado ao largo do Cabedelo foi capaz de fomentar o aumento da restinga e, juntamente com a estrutura de apoio, fixar a barra do Douro e facilitando o acesso entre o oceano e o rio. Como foi apontado por Teodoro (2014), o Cabedelo sofreu uma redução entre os anos de 2002 e 2007, período anterior à obra. A finalização dos molhes em 2007 aparenta ter revertido a situação.…”

Section: Discussionunclassified

“…Estas formam-se em locais onde a disponibilidade de sedimentos e a energia das ondas permite a sua manutenção (Orford, 2006). As restingas apresentam formas variáveis em função de vários fatores, tais como o padrão dominante da ondulação, o espaço disponível, a batimetria adjacente à restinga, a distância à fonte de sedimentos, bem como a sua quantidade e o tipo de sedimentos disponíveis (Teodoro et al, 2014).…”

Section: Introductionunclassified

Quantificação das mudanças recentes na forma e volume da restinga do Cabedelo, foz do rio Douro

Fernandes¹,

Gomes²,

Teixeira³

2021

Geografia, Riscos E Proteção Civil. Homenagem Ao Professor Doutor Luciano Lourenço.

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O Cabedelo da foz do rio Douro é uma das maiores e mais importantes restingas portuguesas. Através da análise de ortoimagens grátis, da aplicação DSAS (Digital Shoreline Analysis System v.05), e análise de MDT’s do Programa COSMO quantificaram-se as movimentações recentes e as alterações no volume do Cabedelo do Douro. Constatou-se que a restinga aumentou significativamente após a construções dos molhes na foz do Douro (2004-2007) e alterou-se, sectorialmente, o volume. Os novos dados disponíveis abrem a possibilidade de análises topo-hidrográficas evolutivas com grande pormenor e rigor altimétrico.

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“…However, it might be beneficial as the sandpit helps to reduce the saline intrusion into river upstream [7]. Therefore, in areas that require greater economic growth, breakwaters or jetties are often built by the inlets to estuaries to prevent sand accumulation due to the longshore drift [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Sand spit morphological evolution at tidal inlets by using satellite images analysis: Two case studies in Vietnam

Anh

Tanaka

Tinh

et al. 2020

STCE

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This paper presents the long-term morphological changes of the sand spits at the Ken Inlet in Ha Tinh Province and Phan Inlet in Binh Thuan Province, Vietnam. The analysis results show that the sand spit morphology at Ken Inlet was drastically changed before the completion of the Da Bac sluice gate construction in 1992, after that the sand spit elongation rate became stable at a rate of about 68 meters per year. Meanwhile, the sand spit at Phan Inlet was breached three times during the winter months of 1990-1991, 1998-1999 and 2014-2015. Moreover, the results of remote sensing image analysis also show that after the sand spit have been breached, it continued elongating at a relatively stable rate of 170÷200 meters per year. Based on the analytical model by Kraus (1999) for predicting the sand spit elongation, the estimated long-shore sediment transport rates of Phan Inlet and Ken Inlet are 145,000 m3/year and 133,500 m3/year, respectively. These longshore sediment transport rates are a main contribution for the sand spit elongation in these study areas. Keywords: sand spits; tidal Inlet; breaching; elongation; Landsat images; Google Earth images.

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Morphological and statistical analysis of the impact of breakwaters under construction on a sand spit area (Douro River estuary)

Cited by 12 publications

References 24 publications

Multi-Temporal Analysis of Forestry and Coastal Environments Using UASs

Multi-Temporal Analysis of Forestry and Coastal Environments Using UASs

Quantificação das mudanças recentes na forma e volume da restinga do Cabedelo, foz do rio Douro

Sand spit morphological evolution at tidal inlets by using satellite images analysis: Two case studies in Vietnam

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