Analyzing the eustatic and geostatic changes in the stability of the Caspian coastal plain (case study: Chalus)

Document Type : Research Article

Authors

• mohamad fathollahzadeh
• mojtaba yamani
• Abolghasem Goorabi
• mehran maghsudi
• mohamad ghadimi

university of tehran

10.22067/geoeh.2024.88908.1501

Abstract

A series of large-scale and long-term environmental processes, including seismic events, construction activities, land use changes and groundwater extraction, along with climate changes in low-lying coastal areas can lead to ground surface instabilities. Coastal deltas are landscapes that leave important effects against tectonic activities due to the proximity of two environments, land and sea. Among the changes in the pattern and location of the formation of deltas, the formation of unbalanced coastal terraces in parts of the coast, and the emergence of cut shorelines in the form of seawalls can be mentioned. In this research, the geomorphic changes of the coastal plain of Chalus due to eustatic and geostatic activities and their effects on the changes of the plain and coastline in the area of ​​Chalos were investigated using remote sensing radar (SBAS and PS models) and geodynamic data. From radar processing, geodynamic data, changes in the level of underground water, geostatic activities, eustatic changes of the Caspian Sea and land use changes, it shows that the Chalos Plain has risen under the influence of geostatic activity in the last two decades. On the other hand, as a result of the land use changes and the increase in river sediment load and the decrease in the level of the Caspian Sea, the coastline of Chalus has advanced towards the sea, which results in significant environmental and economic damages. Therefore, revitalizing vegetation and forests in the Chalus basin to reduce erosion and sediment production and pursuing diplomacy to give the Caspian Sea water rights by the beneficiary countries, especially Russia, can solve the problems that have arisen.

Keywords

• Chalus plain
• eustatic and geostatic changes
• radar interferometry
• coastline changes

Main Subjects

• Coastal hazards

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