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Geoinformatic analysis of vegetation and climate change on intertidal sedimentary landforms in southeastern Australian estuaries from 1975-2015

Journal Article


Abstract


  • Vegetation canopies represent the main ecosystems on intertidal landforms and they

    clearly respond to changes in coastal environments. Climate change, including temperature,

    precipitation and sea level rise, are affecting the health and distribution of coastal vegetation, as well

    as the runoff and sedimentation rates that can impact coastal areas. This study has used the

    normalized difference vegetation index (NDVI) to investigate vegetation canopy dynamics on three

    different coastal sites in southeastern Australia over the past 47 years (1975 2015). NDVIs

    temporal-datasets have been built from satellite images derived from Landsat 1 8. These were then

    regressed to the climatic and geomorphic variables. Results show clear increases in NDVI at

    Towamba and Wandandian Estuaries, but a decline at Comerong Island (southeastern Australia). The

    sedimentation rate has the most significant positive impact on NDVI since it has the potential to

    provide additional space for vegetation. Temperature and sea level rise have positive effects, except

    on Comerong Island, but rainfall has no significant effect on the NDVI at any site. Different NDVI

    trends have been recorded at these three coastal sites reflecting different correlations between the

    vegetation, climatic and geomorphic (as independent) variables. The geomorphological

    characteristics of the highly-dynamic intertidal estuarine landforms, which are subject to active

    erosion and deposition processes, have the largest impact on vegetation cover and, hence, on NDVI.

    Assessing the vegetation canopy using NDVI as an evaluation tool has provided temporal-dynamic

    datasets that can be correlated to the main individual environmental controls. Such knowledge will

    allow resource managers to make more informed decisions for sustainable conservation plans

    following the evaluation the potential consequences of any environmental changes.

Publication Date


  • 2018

Citation


  • Al-Nasrawi, A. K. M., Hamylton, S. M., Jones, B. G. & Kadhim, A. A. (2018). Geoinformatic analysis of vegetation and climate change on intertidal sedimentary landforms in southeastern Australian estuaries from 1975-2015. Aims Geosciences, 4 (1), 36-65.

Number Of Pages


  • 29

Start Page


  • 36

End Page


  • 65

Volume


  • 4

Issue


  • 1

Place Of Publication


  • United Kingdom

Abstract


  • Vegetation canopies represent the main ecosystems on intertidal landforms and they

    clearly respond to changes in coastal environments. Climate change, including temperature,

    precipitation and sea level rise, are affecting the health and distribution of coastal vegetation, as well

    as the runoff and sedimentation rates that can impact coastal areas. This study has used the

    normalized difference vegetation index (NDVI) to investigate vegetation canopy dynamics on three

    different coastal sites in southeastern Australia over the past 47 years (1975 2015). NDVIs

    temporal-datasets have been built from satellite images derived from Landsat 1 8. These were then

    regressed to the climatic and geomorphic variables. Results show clear increases in NDVI at

    Towamba and Wandandian Estuaries, but a decline at Comerong Island (southeastern Australia). The

    sedimentation rate has the most significant positive impact on NDVI since it has the potential to

    provide additional space for vegetation. Temperature and sea level rise have positive effects, except

    on Comerong Island, but rainfall has no significant effect on the NDVI at any site. Different NDVI

    trends have been recorded at these three coastal sites reflecting different correlations between the

    vegetation, climatic and geomorphic (as independent) variables. The geomorphological

    characteristics of the highly-dynamic intertidal estuarine landforms, which are subject to active

    erosion and deposition processes, have the largest impact on vegetation cover and, hence, on NDVI.

    Assessing the vegetation canopy using NDVI as an evaluation tool has provided temporal-dynamic

    datasets that can be correlated to the main individual environmental controls. Such knowledge will

    allow resource managers to make more informed decisions for sustainable conservation plans

    following the evaluation the potential consequences of any environmental changes.

Publication Date


  • 2018

Citation


  • Al-Nasrawi, A. K. M., Hamylton, S. M., Jones, B. G. & Kadhim, A. A. (2018). Geoinformatic analysis of vegetation and climate change on intertidal sedimentary landforms in southeastern Australian estuaries from 1975-2015. Aims Geosciences, 4 (1), 36-65.

Number Of Pages


  • 29

Start Page


  • 36

End Page


  • 65

Volume


  • 4

Issue


  • 1

Place Of Publication


  • United Kingdom