Photogrammetric assessment of shoreline retreat in North Africa: Anthropogenic and natural drivers

Amrouni, Oula; Hzami, Abderraouf; Heggy, E.

doi:10.1016/j.isprsjprs.2019.09.001

Cited by 57 publications

(37 citation statements)

References 40 publications

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“…S2 and Table S8 . In this case, an automatic shoreline detection method using photogrammetric image classification and manual digitization is developed and is fully detailed in 5 .…”

Section: Resultsmentioning

confidence: 99%

“…For instance, the North African arid coasts experience severe shoreline retreat with erosion rates exceeding − 1 to − 5 m/year that accelerate salt intrusion in shallow coastal aquifers ~ 5 km inland causing degradation of near-coastal vegetation coverage by 18% 5 . In particular, the coastal aquifers in the Gulf of Tunis have been substantially overexploited in the last few decades, with a water budget deficit rate of 3.9 Mm 3 /year in 1996.…”

Section: Origins and Implications Of The Coastal Vulnerabilitymentioning

confidence: 99%

“…This increased aridification is causing abrupt changes in coastal dynamics arising from variations in sedimentation and erosion regimes, mostly in sandy and deltaic shorelines 4 . Moreover, the precipitous urban growth and damming of rivers in these coastal arid areas is accentuating sandy beach erosion, causing abnormal retreat rates 5 . The population of the Mediterranean Basin grew from 276 M in 1970 to 522 M in 2019 6 .…”

Section: Introductionmentioning

confidence: 99%

“…The above will cause severe shoreline retreat by several tens of meters along extensive swaths of the Mediterranean shoreline 14 , 15 . Amrouni et al 5 suggests that such rates are already observable across extensive parts of the Tunisian coasts in the Gulf of Hammamet and that they are driven by environmental anthropogenic drivers rather than climatic ones. Even though the Mediterranean Basin consists of three fluctuating climatic regions—temperate, semi-arid and arid, which are characterized by changes in precipitation patterns—several localized environmental anthropogenic factors could have more potent and imminent impacts on coastal dynamics than long-term projected sea-level rise.…”

Section: Introductionmentioning

confidence: 99%

“…This rapid population growth results in a high population density in coastal areas, especially in North Africa, leading to significant exploitation of the coastal resources and their subsequent deterioration [8][9][10] . Such pronounced and rapid degradations are materialized in widely observable shoreline retreats, increased coastal flooding and seawater intrusion in coastal aquifers 5,11 .…”

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confidence: 99%

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Alarming coastal vulnerability of the deltaic and sandy beaches of North Africa

Hzami

Heggy

Amrouni

et al. 2021

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The arid coasts of North Africa, extending over 4633 km from the Gulf of Tunis to the Nile Delta, are undergoing pronounced shoreline retreats and coastal floodings that are reported as a consequence of the ongoing sea level rise resulting from global warming. Of particular interest are the abnormal shoreline dynamics for deltaic and sandy beaches, which are severely impacted by abrupt decadal variabilities in both climatic and anthropogenic drivers resulting in their increased vulnerability to disturbances from coastal hazards. Unfortunately, the evolution, distribution and impacts of these drivers remain largely unquantified, let alone understood, for these extensive arid coasts that harbor the major portion of North Africa’s population as well as unique and fragile marine ecosystems. To address this deficiency, we use GIS-based multi-criteria approaches combined with analytic hierarchy process to map the Coastal Vulnerability Index and the Socioeconomic Vulnerability Index along these coasts to investigate the amplitude and extent of shoreline deterioration resulting from sudden fluctuations in sediment transport to the coastline. We use the western bay of the Gulf of Tunis, the coasts of Tripoli and the Nile Delta as three validation sites for our vulnerability assessment. The statistical Integrated Coastal Vulnerability Index map reveals that 47% of arid North African coasts are characterized by high to very high vulnerability. In particular, we observe that the densely populated deltaic coasts in both Tunisia and Egypt are 70% more vulnerable than any others coast in the eastern Mediterranean Basin. These abnormally high-vulnerability extensive areas are also correlated with significant deterioration of coastal aquifers and hence in crop production, compromising local food security and resulting in increasing outflow migration trends. Both Tunisia and Egypt observed dramatic increases in the net population outflow migration by respectively 62% and 248% between 2000 and 2016, mostly from coastal areas. Our source analysis of the amplitude and extent of these high coastal vulnerabilities suggests that they result from the anthropogenic drivers of damming and rapid urban growth over the last few decades rather than the effects of global warming.

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“…S2 and Table S8 . In this case, an automatic shoreline detection method using photogrammetric image classification and manual digitization is developed and is fully detailed in 5 .…”

Section: Resultsmentioning

confidence: 99%

Section: Origins and Implications Of The Coastal Vulnerabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Alarming coastal vulnerability of the deltaic and sandy beaches of North Africa

Hzami

Heggy

Amrouni

et al. 2021

Sci Rep

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Quantifying decadal volumetric changes along sandy beaches using improved historical aerial photographic models and contemporary data

Carvalho

Allan

Kennedy

et al. 2021

Earth Surf Processes Landf

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Technological advances have reinvigorated the aerial photogrammetric technique using both historical and contemporary imagery, and fostered new perspectives in geomorphology studies. On sandy beaches, however, the dynamic processes, the lack of tonal contrast and reduced texture, make the application of photogrammetry extremely more difficult than in most other landscapes. This study quantifies decadal volumetric changes along the beaches of the Great Ocean Road, Australia, using improved digital surface models (DSMs) derived from structure-from-motion (SfM) photogrammetry applied to historical archives and a contemporary unmanned aerial vehicle survey. Alongside surficial sediment analysis, this approach demonstrates the potential to relate present-day to historical morphological changes at sandy beaches worldwide. The discussion highlights the influence of photographic scale, lens distortions, ground control points in segmented blocks, and the use of shoreline as a proxy of volumetric change. DSMs were

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Shoreline change dynamics along the Augusta coast, eastern Sicily, South Italy

Laksono

Borzì

Distefano

et al. 2023

Earth Surf Processes Landf

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The coastal region of Augusta, eastern Sicily, Italy, is a densely populated zone, where human pressures profoundly shaped the coastal and land dynamics. So far, understanding the interaction between natural and human processes in modelling coastal geomorphology is still quite challenging. However, coastal and environmental monitoring poses the bases for managing coastal areas properly. Therefore, the aim of this research was first to understand the medium‐term shoreline changes along Augusta Bay between 1972 and 2021, and then assess the main local coastal modifications determined by the increasing coastal armouring. To do so, the shorelines dataset was extracted from Landsat and Sentinel‐2 satellite imageries using the NDWI and mNDWI methods and then statistical parameters were computed using Digital Shoreline Analysis System (DSAS). Results show that this coastal fringe experienced significant shoreline recession over the studied time interval. Negative shoreline shifts are higher in correspondence with torrent deltas, as a result of the increasing human and natural forces insisting on the land and coastal environments. Since 1970s, Augusta Bay registered a significant increase in artificial coastal length and a coastal armouring index of Maximal level was reached today.

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Photogrammetric assessment of shoreline retreat in North Africa: Anthropogenic and natural drivers

Cited by 57 publications

References 40 publications

Alarming coastal vulnerability of the deltaic and sandy beaches of North Africa

Alarming coastal vulnerability of the deltaic and sandy beaches of North Africa

Quantifying decadal volumetric changes along sandy beaches using improved historical aerial photographic models and contemporary data

Shoreline change dynamics along the Augusta coast, eastern Sicily, South Italy

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