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On June 30, 2022 at 10:35:20 AM CDT, kelsey-friesenumanitoba-ca:
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Updated description of resource Water and Vegetation Cover in Netley-Libau Marsh 1990 – 2013. Phase II Report: A time series analysis based on landsat imagery in Netley-Libau Marsh Reports from
Netley-Libau Marsh, the largest coastal wetland adjoining Lake Winnipeg, has been mapped by aerial photography in the past (Grosshans et al 2004; Verbiwski 1986), indicating a trend of vegetation loss, but a lack of historic aerial photography has limited mapping efforts to sporadic intervals. Satellite imagery, though of a coarser spatial resolution, has the advantage of high temporal and spectral resolution. Using Landsat images and a methodology developed in an earlier phase of this study (Watchorn 2014), a time series of classified vegetation cover maps was produced for twelve years between 1990 and 2013. Water cover maps were produced for another eight years within this interval, resulting in a time series representing 20 years of this 23-year period. This time series allowed for an investigation into relationships between the extent and distribution of Netley’s vegetation community to underlying hydrological factors on adjoining Lake Winnipeg and the Red River, which can be used to guide future marsh remediation measures. The analysis of this time series indicates that the long-term trend of vegetation loss in Netley-Libau Marsh has not been steady, nor has it been unidirectional. Observed vegetation change – both loss and gain – was characterised by sudden dramatic changes disrupting periods of relative stasis. Lake Winnipeg water level was identified as the major factor responsible for shifting the balance between emergent wetland vegetation and open water. Periods of low water as short as one year had dramatic and persistent effects on emergent vegetation cover, particularly in smaller lakes. Regenerated emergent vegetation was less persistent in the large Netley Lake, suggesting that marsh bathymetry is dynamic. This study also identified that Lake Winnipeg water level and Red River flow are both contributing factors which influence the extent of wet meadows around Netley-Libau Marsh. Decreased river discharges and lake levels were correlated with increasing use of these regions as hayed or cultivated land. Finally, the interpretation of the cover map time series indicates the connectivity between the marsh lakes and Lake Winnipeg has varied and is presently increasing.
toWater and Vegetation cover in Netley-Libau Marsh 1990-2013. Phase II report: A time series analysis based on Landsat Imagery
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4 | "affiliation": "Environment and Climate Change Canada", | 4 | "affiliation": "Environment and Climate Change Canada", | ||
5 | "creatorName": "Watchorn, K. Elise", | 5 | "creatorName": "Watchorn, K. Elise", | ||
6 | "email": "elisewatchorn@hotmail.com", | 6 | "email": "elisewatchorn@hotmail.com", | ||
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8 | "nameType": "Personal" | 8 | "nameType": "Personal" | ||
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12 | "PublicationYear": "2022", | 12 | "PublicationYear": "2022", | ||
13 | "Publisher": "Enivronment and Climate Change Canada", | 13 | "Publisher": "Enivronment and Climate Change Canada", | ||
14 | "ResourceType": "report", | 14 | "ResourceType": "report", | ||
15 | "Rights": "Open Government Licence 2.0 \u2013 Canada", | 15 | "Rights": "Open Government Licence 2.0 \u2013 Canada", | ||
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31 | "description": "Inland water features, drainage systems and | 31 | "description": "Inland water features, drainage systems and | ||
32 | their characteristics. Examples of data you can find here include | 32 | their characteristics. Examples of data you can find here include | ||
33 | river and lake data, water quality data. \r\n\r\nIn CEOS, related | 33 | river and lake data, water quality data. \r\n\r\nIn CEOS, related | ||
34 | research themes include biogeochemistry, Inland lakes and waters, | 34 | research themes include biogeochemistry, Inland lakes and waters, | ||
35 | modelling, remote sensing and technology, trace metals and | 35 | modelling, remote sensing and technology, trace metals and | ||
36 | contaminants.", | 36 | contaminants.", | ||
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67 | "notes": "Phase I and II reporting on time series analysis based on | 67 | "notes": "Phase I and II reporting on time series analysis based on | ||
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74 | "description": "At Environment and Climate Change Canada (ECCC), | 74 | "description": "At Environment and Climate Change Canada (ECCC), | ||
75 | our business is protecting the environment, conserving the country's | 75 | our business is protecting the environment, conserving the country's | ||
76 | natural heritage, and providing weather and meteorological information | 76 | natural heritage, and providing weather and meteorological information | ||
77 | to keep Canadians informed and safe.\r\n\r\nEnvironment and Climate | 77 | to keep Canadians informed and safe.\r\n\r\nEnvironment and Climate | ||
78 | Change Canada is building on its accomplishments with the environment | 78 | Change Canada is building on its accomplishments with the environment | ||
79 | through credible science, effective regulations and legislation, | 79 | through credible science, effective regulations and legislation, | ||
80 | successful partnerships, and high-quality service delivery to | 80 | successful partnerships, and high-quality service delivery to | ||
81 | Canadians.\r\n\r\nWe support sound environmental decisions. We work to | 81 | Canadians.\r\n\r\nWe support sound environmental decisions. We work to | ||
82 | repair the damage of the past, to collect and pass on knowledge, and | 82 | repair the damage of the past, to collect and pass on knowledge, and | ||
83 | to develop, implement and enforce policies to prevent future issues. | 83 | to develop, implement and enforce policies to prevent future issues. | ||
84 | We also work to ensure that Canadians have a safe, clean and | 84 | We also work to ensure that Canadians have a safe, clean and | ||
85 | sustainable environment today, tomorrow and well into the | 85 | sustainable environment today, tomorrow and well into the | ||
86 | future.\r\n\r\nEnvironment and Climate Change Canada is a diverse | 86 | future.\r\n\r\nEnvironment and Climate Change Canada is a diverse | ||
87 | organization where our programs, services, and people lead the way in | 87 | organization where our programs, services, and people lead the way in | ||
88 | implementing the Government of Canada\u2019s environmental agenda. We | 88 | implementing the Government of Canada\u2019s environmental agenda. We | ||
89 | collaborate with our partners at home and abroad, to realize concrete | 89 | collaborate with our partners at home and abroad, to realize concrete | ||
90 | progress on initiatives that will protect the health of our people and | 90 | progress on initiatives that will protect the health of our people and | ||
91 | our planet.\r\n\r\n# Our Mandate\r\nEnvironment and Climate Change | 91 | our planet.\r\n\r\n# Our Mandate\r\nEnvironment and Climate Change | ||
92 | Canada's mandate is to: \r\n* preserve and enhance the quality of the | 92 | Canada's mandate is to: \r\n* preserve and enhance the quality of the | ||
93 | natural environment, including water, air, soil, flora and fauna\r\n* | 93 | natural environment, including water, air, soil, flora and fauna\r\n* | ||
94 | conserve Canada's renewable resources;\r\n*conserve and protect | 94 | conserve Canada's renewable resources;\r\n*conserve and protect | ||
95 | Canada's water resources;\r\n*forecast daily weather conditions and | 95 | Canada's water resources;\r\n*forecast daily weather conditions and | ||
96 | warnings, and provide detailed meteorological information to all of | 96 | warnings, and provide detailed meteorological information to all of | ||
97 | Canada;\r\n*enforce rules relating to boundary waters; | 97 | Canada;\r\n*enforce rules relating to boundary waters; | ||
98 | and\r\n*coordinate environmental policies and programs for the federal | 98 | and\r\n*coordinate environmental policies and programs for the federal | ||
99 | government.", | 99 | government.", | ||
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n | 121 | "description": "Netley-Libau Marsh, the largest coastal wetland | n | 121 | "description": "Water and Vegetation cover in Netley-Libau Marsh |
122 | adjoining Lake Winnipeg, has been mapped by aerial\r\nphotography in | 122 | 1990-2013. Phase II report: A time series analysis based on Landsat | ||
123 | the past (Grosshans et al 2004; Verbiwski 1986), indicating a trend of | 123 | Imagery", | ||
124 | vegetation loss, but\r\na lack of historic aerial photography has | ||||
125 | limited mapping efforts to sporadic intervals. Satellite | ||||
126 | imagery,\r\nthough of a coarser spatial resolution, has the advantage | ||||
127 | of high temporal and spectral resolution. Using\r\nLandsat images and | ||||
128 | a methodology developed in an earlier phase of this study (Watchorn | ||||
129 | 2014), a time\r\nseries of classified vegetation cover maps was | ||||
130 | produced for twelve years between 1990 and 2013. Water\r\ncover maps | ||||
131 | were produced for another eight years within this interval, resulting | ||||
132 | in a time series\r\nrepresenting 20 years of this 23-year period. This | ||||
133 | time series allowed for an investigation into\r\nrelationships between | ||||
134 | the extent and distribution of Netley\u2019s vegetation community to | ||||
135 | underlying\r\nhydrological factors on adjoining Lake Winnipeg and the | ||||
136 | Red River, which can be used to guide future\r\nmarsh remediation | ||||
137 | measures.\r\nThe analysis of this time series indicates that the | ||||
138 | long-term trend of vegetation loss in Netley-Libau Marsh\r\nhas not | ||||
139 | been steady, nor has it been unidirectional. Observed vegetation | ||||
140 | change \u2013 both loss and gain \u2013\r\nwas characterised by sudden | ||||
141 | dramatic changes disrupting periods of relative stasis. Lake Winnipeg | ||||
142 | water\r\nlevel was identified as the major factor responsible for | ||||
143 | shifting the balance between emergent wetland\r\nvegetation and open | ||||
144 | water. Periods of low water as short as one year had dramatic and | ||||
145 | persistent effects\r\non emergent vegetation cover, particularly in | ||||
146 | smaller lakes. Regenerated emergent vegetation was less\r\npersistent | ||||
147 | in the large Netley Lake, suggesting that marsh bathymetry is dynamic. | ||||
148 | This study also\r\nidentified that Lake Winnipeg water level and Red | ||||
149 | River flow are both contributing factors which influence\r\nthe extent | ||||
150 | of wet meadows around Netley-Libau Marsh. Decreased river discharges | ||||
151 | and lake levels were\r\ncorrelated with increasing use of these | ||||
152 | regions as hayed or cultivated land. Finally, the interpretation | ||||
153 | of\r\nthe cover map time series indicates the connectivity between the | ||||
154 | marsh lakes and Lake Winnipeg has\r\nvaried and is presently | ||||
155 | increasing. ", | ||||
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183 | vegetation map coverages. Produced based on aerial photography and | 151 | vegetation map coverages. Produced based on aerial photography and | ||
184 | satellite imagery Netley-Libau Marsh, 2001.", | 152 | satellite imagery Netley-Libau Marsh, 2001.", | ||
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