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Lidar Derived Models and NDVI Trends...

Aslami, Farnoosh,

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Lidar Derived Models and NDVI Trends Indicate Vegetation Threshold Response to Hydroclimatic Drivers Across the Peace Athabasca Delta /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Lidar Derived Models and NDVI Trends Indicate Vegetation Threshold Response to Hydroclimatic Drivers Across the Peace Athabasca Delta // Farnoosh Aslami.
作者:	Aslami, Farnoosh,
面頁冊數:	1 electronic resource (142 pages)
附註:	Source: Masters Abstracts International, Volume: 85-12.
Contained By:	Masters Abstracts International85-12.
標題:	Geography. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31140843
ISBN:	9798382786841

Lidar Derived Models and NDVI Trends Indicate Vegetation Threshold Response to Hydroclimatic Drivers Across the Peace Athabasca Delta /
Aslami, Farnoosh,

Lidar Derived Models and NDVI Trends Indicate Vegetation Threshold Response to Hydroclimatic Drivers Across the Peace Athabasca Delta /Farnoosh Aslami. - 1 electronic resource (142 pages)

Source: Masters Abstracts International, Volume: 85-12.

In northeastern Alberta, Canada, the Peace Athabasca Delta (PAD) is a Ramsar and UNESCO World Heritage-designated wetland complex vital for biodiversity and well-being of the Indigenous communities residing there. In this study, remote sensing techniques were used to understand the changes that have occurred within the PAD over the past four decades. Initially, lidar data was used to quantify vegetation height changes and better understand NDVI (Normalised Difference Vegetation Index) trends across lidar survey sample areas. These findings were then utilized to interpret Landsat-derived vegetation and surface water trends across the entire PAD. Between 1984 and 2022, NDVI trend analysis indicated greening along ecotones surrounding perched basins (shrubification), accompanied by noticeable drying patterns in the surface water trends. Further, a significant drying event spanning 1999 to 2003, appears to have been initiated by the strong 1998 El Niño event. The overall average greening rates pre and post 1999-2003 were 2.1 m/yr. and 3.1 m/yr., respectively. The severe drying during that short interval appears to have altered the rate and patter of vegetation processes across the delta post-2003. The more recent period of 2018 to 2022 was also notable for the observed high levels of inundation. If the PAD's open water and vegetation cover trends continue, surface moisture is generally expected to decrease, with commensurate increases in shrub cover. Meanwhile, certain areas like the southern region around Mamawi Lake, could become wetter due to localised changes in surface drainage. While flooding events are expected to continue to be a regular feature of this landscape, the extent to which the PAD can return to its historically large areas of persistent inundation remains uncertain.

English

ISBN: 9798382786841Subjects--Topical Terms:

524010
Geography.
Subjects--Index Terms:

Landsat

Lidar Derived Models and NDVI Trends Indicate Vegetation Threshold Response to Hydroclimatic Drivers Across the Peace Athabasca Delta /
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300 $a 1 electronic resource (142 pages)
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500 $a Source: Masters Abstracts International, Volume: 85-12.
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520 $a In northeastern Alberta, Canada, the Peace Athabasca Delta (PAD) is a Ramsar and UNESCO World Heritage-designated wetland complex vital for biodiversity and well-being of the Indigenous communities residing there. In this study, remote sensing techniques were used to understand the changes that have occurred within the PAD over the past four decades. Initially, lidar data was used to quantify vegetation height changes and better understand NDVI (Normalised Difference Vegetation Index) trends across lidar survey sample areas. These findings were then utilized to interpret Landsat-derived vegetation and surface water trends across the entire PAD. Between 1984 and 2022, NDVI trend analysis indicated greening along ecotones surrounding perched basins (shrubification), accompanied by noticeable drying patterns in the surface water trends. Further, a significant drying event spanning 1999 to 2003, appears to have been initiated by the strong 1998 El Niño event. The overall average greening rates pre and post 1999-2003 were 2.1 m/yr. and 3.1 m/yr., respectively. The severe drying during that short interval appears to have altered the rate and patter of vegetation processes across the delta post-2003. The more recent period of 2018 to 2022 was also notable for the observed high levels of inundation. If the PAD's open water and vegetation cover trends continue, surface moisture is generally expected to decrease, with commensurate increases in shrub cover. Meanwhile, certain areas like the southern region around Mamawi Lake, could become wetter due to localised changes in surface drainage. While flooding events are expected to continue to be a regular feature of this landscape, the extent to which the PAD can return to its historically large areas of persistent inundation remains uncertain.
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650 4 $a Physical geography. $3 516662
650 4 $a Remote sensing. $3 535394
650 4 $a Climate change. $2 bicssc $3 2079509
653 $a Landsat
653 $a Lidar
653 $a Peace Athabasca Delta
653 $a Trend analysis
653 $a Biodiversity
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690 $a 0368
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710 2 $a University of Lethbridge (Canada). $b Geography and Environment. $e degree granting institution. $3 3829721
720 1 $a Hopkinson, Christopher $e degree supervisor.
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856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31140843