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TitleA novel protocol for mapping the spatial distribution of storm derived sediment in lakes
AuthorPatterson, R T; Mazzella, V; Macumber, A L; Gregory, B R B; Patterson, C W; Nasser, N A; Roe, H M; Galloway, J MORCID logo; Reinhardt, E G
SourceSN Applied Sciences vol. 2, issue 12, 2125, 2020 p. 1-16, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20200576
PublisherSpringer Nature
Mediapaper; on-line; digital
File formatpdf; html
ProvinceNew Brunswick
NTS21G/11; 21G/13
AreaHarvey Lake; Canada
Lat/Long WENS -67.0639 -67.0033 45.7719 45.7250
SubjectsScience and Technology; sedimentology; storms; suspended sediments; lake sediment geochemistry; lakes; mapping techniques; Geomatics
Illustrationslocation maps; frequency distribution diagrams; charts
ProgramEnvironmental Geoscience Mackenzie River
Released2020 12 01
AbstractA novel geomatics methodology is presented for locating optimal lake coring sites to potentially capture evidence of paleo-storms. One hundred sediment-water interface samples collected from Harvey Lake, NB, Canada (45°43'45"N; 67°00'25"W) were analyzed using: end member mixing analysis (EMMA), which can be used to recognize modal grain size distributions derived from sediment resuspension during major storms; and ITRAX derived Ti, an indicator of catchment runoff, which is enhanced during major storm events. Geospatial models based on lake bathymetric and historical wind speed data (Fredericton INTL A climatological station; 1953-2015) were used to determine lake bottom areas susceptible to wave base sediment resuspension. EMMA End Member (EM) 02 (mode=40 µm) was widely distributed in areas > 4.4. m water depth, which have been unimpacted by wave base remobilization since 1953. Deposition of EM 02 was interpreted to be of major storm derivation, the result of fallout of resuspended sediments from the water column. This EM was most concentrated in the central part of the lake at >6 m water depth, as well as at the z-max (~11m), and in Herbert's Cove (3-6 m). The main source of run-off derived Ti into the lake was through Sucker Brook, with the highest concentrations in Herbert's Cove and the central part of the lake, including the lake z-max. This assessment indicates that the best undisturbed sedimentary record of paleo-storms is mostly likely in the central part of the lake north of the z-max at water depths of >6 m, as well as deeper water areas of Herbert's Cove.
Summary(Plain Language Summary, not published)
End Member Mixing Analysis identified a widely distributed end member within Harvey Lake that was derived from major storm sediment reworking. ITRAX analysis was used to identify the provenance and areas of Harvey Lake where storm water runoff derived Ti was most concentrated. Geospatial analysis of bathymetric and wind speed data in conjunction with EMMA and Ti results identified optimal areas to core for paleostorm records.

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