Monitoring Coastline Changes and Identifying Geomorphic Response Models of Barrier Islands along the Low-Lying Deltaic Coasts of Gabrik and Jagin

Document Type : Original Article

Authors

1 Ph. D. Department of Physical Geography, Faculty of Geography and Environmental Planning, University of Sistsn and Baluchestan. Zahedan. Iran.

2 Ph. D. Department of Landscape Design Engineering, Faculty of Geography and Environmental Planning, University of Sistan and Baluchestan, ZAHEDAN, IRAN.

Abstract

Coastal barriers are ubiquitous globally and provide a vital protective role to valuable landforms, habitats and communities located to landward. Barrier islands are the first line of defense against the action of sea waves in coastal areas; therefore, assessing their sustainability is very important in integrated coastal zone planning and management. Global climate change affects this coastline through sea level rise (SLR), compounded by a decrease in sediment budgets in coastal areas. This study evaluated the spatiotemporal changes in the coastline of the barrier islands of the Gabric and Jagin deltas during 1984-2024 and identified the geomorphic response models of these islands based on the model proposed by McBride et al., (1995). In this regard, Landsat satellite imagery from the TM, ETM+ & OLI sensor series, topographic maps, and ENVI, ERDAS IMAGINE & ArcGIS software have been used. The findings showed that all eight geomorphic response models presented by McBride et al., (1995) (i.e., lateral movement, advance, retreat, in-place narrowing, landward rollover, dynamic equilibrium, breakup, and rotational instability) have formed in the study area; and the advance, retreat, lateral movement, rotational instability, and in-place narrowing models were the most common examples of geomorphic response of barrier islands in the study area. Also, the findings showed that wherever the interaction between various forces acting on the coastline from the land and the sea is manifested, barrier islands usually exhibit more than one geomorphic response model. Barrier island systems reflected various environmental changes and are now considered as a warning indicator for examining regional and global changes; therefore, it is necessary to continue monitoring the geomorphic responses of this area of ​​the country's coasts in order to plan and manage the coastline and coastal area optimally.

Highlights

  • The findings showed that the low-lying deltaic coasts of Gabric and Jagin are one of the best areas for monitoring and identifying various geomorphic response- type models of barrier islands in the country.
  • Given the unique characteristics of the study area, it was found that all eight geomorphic response-type models of barrier islands studied and introduced by McBride et al. (1995) have formed and developed along the coastline of the Gabrik and Jagin delta fronts.

Keywords

Main Subjects

References

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