The dynamics of the Danube channel over the last 150 years (Giurgiu - Călărași sector. Preliminary data)

Grécu, Florina; Grigore, ștefania; Ioana-Toroimac, Gabriela; Ghiţă, Cristina

doi:10.15551/prgs.2017.56

Cited by 4 publications

(3 citation statements)

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“…The evaluation of the sedimentary accumulations was determined from Figures 8 and 9, showing the morphometric parameter variations according to their measurement dates, and the results of the perimeters and area means (ΔP and ΔS), obtained using formulas (3) and (4).…”

Section: Evolution Of the Islands System Between 1995 And 2009mentioning

confidence: 99%

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The Utility of Morphometric Parameters Extracted from SAR Radar Images in the Monitoring of the Dynamics of the Danube Island System, Giurgiu-Călăraşi Sector, Romania

Hachemi¹,

Grécu²,

Ioana-Toroimac³

et al. 2021

IJDNE

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The Danube islands system is continuously undergoing real degradations caused by natural and anthropogenic processes, thus causing a weakening of the biological potential and generating ecological and socio-economic imbalances. The lack of frequent data on the morphometric parameters of the islands in this region constitutes a major gap for monitoring, understanding and diagnosing the state of their evolution. The aim of this work is to show the importance of morphometric parameters extracted from SAR radar amplitude images in the monitoring of the dynamics of the Danube island system, along the Giurgiu-Călăraşi sector, at the frontier of Romania – Bulgaria. This study conducted by extraction of islands allowed us to detect and monitor the evolution of each island and sub-island, between 1995 and 2009, with great precision. The results obtained showed a displacement of the island system in the South-East direction with an average annual velocity of about 1 m/year and sediment accumulations with an average radius velocity estimated at 1.34 m/year during this period of 14 years. The increase of sediment accumulation during the studied period is due to river bank erosion and to the major floods produced in 2005 on the tributary rivers and especially those of 2006 on the Danube River.

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Section: Evolution Of the Islands System Between 1995 And 2009mentioning

confidence: 99%

“…The natural vegetation on the islands is partially replaced. Chernozem soils are found on the terraces and in the plain and alluvial soil are found in the major river bed [4].…”

Section: Introductionmentioning

confidence: 99%

The Utility of Morphometric Parameters Extracted from SAR Radar Images in the Monitoring of the Dynamics of the Danube Island System, Giurgiu-Călăraşi Sector, Romania

Hachemi¹,

Grécu²,

Ioana-Toroimac³

et al. 2021

IJDNE

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“…The small islands with reduced altitudes are often flooded. The surface alluvial deposits belong to the upper Quaternary (upper and actual Holocene) being formed of gravels, sand, loess deposits with variable grain-size depending on the position towards the great tributaries of the Danube or on the position of the island towards the banks [6].…”

Section: Geological Geomorphologic and Climatic Characteristics Of The Study Areamentioning

confidence: 99%

Contribution of SAR Radar Imagery in the Study of the Dynamics of the Danube Island System, Giurgiu-Călăraşi Sector, Romania

Hachemi¹,

Grécu²,

Ioana-Toroimac³

et al. 2020

AMA_B

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SAR radar imagery allows spatial and temporal, regular and precise tracking of surfaces. The response of the radar signal is particularly sensitive to the topography, the roughness and the humidity of the grounds, thus making it possible to detect possible changes occurring between different acquisitions. The surface of the islands is formed especially of alluvial materials and covered by vegetation. The latter contributes greatly to the stability of the islands. The aim of this work is to show the contribution of radar imagery in the study of the dynamics of the Danube island system, Giurgiu-Călăraşi sector, in Romania. This study, based on amplitude images, showed the possibility of determining, locating, inventorying and mapping 11 islands (including 19 sub-islands). The radar images delimit perfectly the latter due to their sensitivity to roughness. Their surface is very rough and wet represented by a strong radiometry. On the other hand, the water surface is smooth thus giving values of low radiometry. The first results obtained show that over this period between 1995 and 2009, the changes are due mainly to weather conditions, precipitation and very high wind speeds. They also reveal an increase in sediment over this 14-year period.

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Dynamics of Islands and Danube River Channel Along Vedea-Călărași Sector (1856–2019): Hydrogeomorphological Approach

Grécu

Ioana-Toroimac

Osaci-Costache

et al. 2022

The Lower Danube River

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The dynamics of the Danube channel over the last 150 years (Giurgiu - Călărași sector. Preliminary data)

Cited by 4 publications

References 0 publications

The Utility of Morphometric Parameters Extracted from SAR Radar Images in the Monitoring of the Dynamics of the Danube Island System, Giurgiu-Călăraşi Sector, Romania

The Utility of Morphometric Parameters Extracted from SAR Radar Images in the Monitoring of the Dynamics of the Danube Island System, Giurgiu-Călăraşi Sector, Romania

Contribution of SAR Radar Imagery in the Study of the Dynamics of the Danube Island System, Giurgiu-Călăraşi Sector, Romania

Dynamics of Islands and Danube River Channel Along Vedea-Călărași Sector (1856–2019): Hydrogeomorphological Approach

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