Identifying spatial patterns of storm driven flooding and erosion at Nelson Lagoon, Alaska
Thesis (M.S.) University of Alaska Fairbanks, 2021 This project quantifies localized potential for shoreline change and flooding at Nelson Lagoon, a small fishing community located on the Bering Sea coast of the Alaska Peninsula. The overall goal of this project is to generate societally relevant an...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/12537 2023-05-15T15:43:59+02:00 Identifying spatial patterns of storm driven flooding and erosion at Nelson Lagoon, Alaska Bogardus, Reyce C. Maio, Chris Mann, Daniel Overbeck, Jacquelyn 2021-05 http://hdl.handle.net/11122/12537 en_US eng http://hdl.handle.net/11122/12537 Department of Geosciences Floods Native Village of Nelson Lagoon Coast changes Alaska Erosion Master of Science in Geosciences Thesis ms 2021 ftunivalaska 2023-02-23T21:37:57Z Thesis (M.S.) University of Alaska Fairbanks, 2021 This project quantifies localized potential for shoreline change and flooding at Nelson Lagoon, a small fishing community located on the Bering Sea coast of the Alaska Peninsula. The overall goal of this project is to generate societally relevant and locally applicable map and data products through synergistic relationships with federal, state, private, tribal, and public partners. This project intends to substantiate anecdotal observations by local residents, with the ultimate goal of informing erosion and flooding mitigation efforts moving forward. Long-term trends of shoreline change were measured using multi-temporal orthorectified aerial imagery between 1983 and 2019, while annual changes in shoreline morphology were measured via cross-shore elevation profiles using a survey grade Real-time-Kinematic Global Navigational Satellite System (RTK-GNSS). Shoreline positions were extrapolated using linear regression techniques. A digital surface model (DSM) of the community was derived using Structure-from-Motion (SfM) with >2,400 aerial images collected with an Unmanned Aerial Vehicle (UAV) and used to assess flooding vulnerability after being geodetically referenced and related to a local tidal datum computed by this project. New and existing topographic and bathymetric datasets were compiled and refined into a 6,000 km² topobathymetric "seamless elevation" model of the Nelson Lagoon area, over which storm-tide induced currents were simulated using Delft3D FM Suite HMWQ. Remote sensing records indicate that the Nelson Lagoon spit elongated by more than 800 m and narrowed with an average Net Shoreline Movement (NSM) of -16.9 m between 1983 and 2019 (distal end not included). Though, NSM values show high variability ([sigma] = 21.9 m) and the lagoon and seaward sides of the spit are exhibiting very different erosional regimes. On both sides of the spit, episodes of rapid erosion mainly occurred during high storm-tide events that coincided with significant ... Thesis Bering Sea Alaska University of Alaska: ScholarWorks@UA Bering Sea Fairbanks The Spit ENVELOPE(170.217,170.217,-71.300,-71.300) |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Floods Native Village of Nelson Lagoon Coast changes Alaska Erosion Master of Science in Geosciences |
spellingShingle |
Floods Native Village of Nelson Lagoon Coast changes Alaska Erosion Master of Science in Geosciences Bogardus, Reyce C. Identifying spatial patterns of storm driven flooding and erosion at Nelson Lagoon, Alaska |
topic_facet |
Floods Native Village of Nelson Lagoon Coast changes Alaska Erosion Master of Science in Geosciences |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2021 This project quantifies localized potential for shoreline change and flooding at Nelson Lagoon, a small fishing community located on the Bering Sea coast of the Alaska Peninsula. The overall goal of this project is to generate societally relevant and locally applicable map and data products through synergistic relationships with federal, state, private, tribal, and public partners. This project intends to substantiate anecdotal observations by local residents, with the ultimate goal of informing erosion and flooding mitigation efforts moving forward. Long-term trends of shoreline change were measured using multi-temporal orthorectified aerial imagery between 1983 and 2019, while annual changes in shoreline morphology were measured via cross-shore elevation profiles using a survey grade Real-time-Kinematic Global Navigational Satellite System (RTK-GNSS). Shoreline positions were extrapolated using linear regression techniques. A digital surface model (DSM) of the community was derived using Structure-from-Motion (SfM) with >2,400 aerial images collected with an Unmanned Aerial Vehicle (UAV) and used to assess flooding vulnerability after being geodetically referenced and related to a local tidal datum computed by this project. New and existing topographic and bathymetric datasets were compiled and refined into a 6,000 km² topobathymetric "seamless elevation" model of the Nelson Lagoon area, over which storm-tide induced currents were simulated using Delft3D FM Suite HMWQ. Remote sensing records indicate that the Nelson Lagoon spit elongated by more than 800 m and narrowed with an average Net Shoreline Movement (NSM) of -16.9 m between 1983 and 2019 (distal end not included). Though, NSM values show high variability ([sigma] = 21.9 m) and the lagoon and seaward sides of the spit are exhibiting very different erosional regimes. On both sides of the spit, episodes of rapid erosion mainly occurred during high storm-tide events that coincided with significant ... |
author2 |
Maio, Chris Mann, Daniel Overbeck, Jacquelyn |
format |
Thesis |
author |
Bogardus, Reyce C. |
author_facet |
Bogardus, Reyce C. |
author_sort |
Bogardus, Reyce C. |
title |
Identifying spatial patterns of storm driven flooding and erosion at Nelson Lagoon, Alaska |
title_short |
Identifying spatial patterns of storm driven flooding and erosion at Nelson Lagoon, Alaska |
title_full |
Identifying spatial patterns of storm driven flooding and erosion at Nelson Lagoon, Alaska |
title_fullStr |
Identifying spatial patterns of storm driven flooding and erosion at Nelson Lagoon, Alaska |
title_full_unstemmed |
Identifying spatial patterns of storm driven flooding and erosion at Nelson Lagoon, Alaska |
title_sort |
identifying spatial patterns of storm driven flooding and erosion at nelson lagoon, alaska |
publishDate |
2021 |
url |
http://hdl.handle.net/11122/12537 |
long_lat |
ENVELOPE(170.217,170.217,-71.300,-71.300) |
geographic |
Bering Sea Fairbanks The Spit |
geographic_facet |
Bering Sea Fairbanks The Spit |
genre |
Bering Sea Alaska |
genre_facet |
Bering Sea Alaska |
op_relation |
http://hdl.handle.net/11122/12537 Department of Geosciences |
_version_ |
1766378205084647424 |