Lake-based magnetic mapping of contaminated sediment distribution, Hamilton Harbour, Lake Ontario, Canada

Pozza, Matthew R.; Boyce, Joseph I.; Morris, William A.

doi:10.1016/j.jappgeo.2004.08.005

Cited by 29 publications

(17 citation statements)

References 30 publications

(49 reference statements)

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“…The statistical levelling method employed in this study uses a least squares statistical approach to minimize the residual errors at line intersection points (Green, 1983;Minty, 1991;Luyendyk, 1997;Mauring et al, 2000) ( Figure 5c). This technique is commonly applied to airborne geophysical data to remove flight-line corrugations in gridded data (Luyendyk, 1997) but is equally effective for removal of striping in bathymetry Pozza, Boyce, & Morris, 2004) (Figures 5a, b).…”

Section: Bathymetry Surveymentioning

confidence: 99%

Data‐fused digital bathymetry and side‐scan sonar as a base for archaeological inventory of submerged landscapes in the Rideau Canal, Ontario, Canada

Sonnenburg

Boyce

2008

Geoarchaeology

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Colonel By Lake, located near Kingston, Ontario, was created in the early 19th century during the construction of the Rideau Canal waterway. Canal flooding inundated a large area of the Cataraqui River lowlands, submerging important pre-contact and colonial settlements. In order to gain a better understanding of the pre-canal environment and its archaeological setting, a systematic bathymetry and side-scan sonar survey was conducted over a 2-km 2 area of Colonel By Lake. A 2-D digital bathymetric model (DBM) of the lake bottom was constructed and overlain with side-scan mosaics to map the paleogeography of the river flood plain. The data-fused sonar images clearly identify the submerged pre-canal topography, including the former Cataraqui River channel, relict meanders, tree stump fields, and bedrock uplands defining the valley sides. By comparing the DBM with landscapes depicted in pre-canal period maps (ca. 1828), the locations of several potential archaeological targets were identified. The DBM provides a basis for mapping submerged cultural resources in the Rideau and for predicting the location of undiscovered archaeological sites. The results show that integration of single-beam bathymetric mapping with side-scan imagery is an effective strategy for mapping submerged terrestrial landscapes and archaeological inventory in shallow water settings.

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Section: Bathymetry Surveymentioning

confidence: 99%

Data‐fused digital bathymetry and side‐scan sonar as a base for archaeological inventory of submerged landscapes in the Rideau Canal, Ontario, Canada

Sonnenburg

Boyce

2008

Geoarchaeology

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“…Studies of stressed estuarine environments and harbors (Chan et al, 1998Versteeg et al, 1995;Pozza et al, 2004) have revealed positive correlations of magnetic susceptibility and heavy metal concentrations due to industrial combustion processes, which release both iron oxides and heavy metal particles (Beckwith et al, 1986;Hanesch and Scholger, 2002). Other studies have reported an inverse correlation of magnetic susceptibility with heavy metal content, as a consequence of intensified chemical diagenesis of primary iron oxides and heavy mineral precipitation under conditions of enhanced organic input.…”

Section: Marine Environmental Magnetismmentioning

confidence: 99%

“…(3) Pozza et al (2004) estimated metal pollutant levels from core-based and magnetometer measurements in Hamilton Harbour (Canada). They found that the magnetic susceptibility of contaminated sediment layers is by one to two orders of magnitude higher than that of the uncontaminated sediment.…”

Section: Marine Magneticsmentioning

confidence: 99%

Characterization of marine near-surface sediments by electromagnetic profiling

Müller

2010

GEOPHYSICS

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II PrefaceThe research, development and implementation of an electromagnetic seafloor profiler GEM Shark has been made possible through the joint funding of the Center for Marine Environ- The main part of this cumulative thesis (Chapters 2-4) consists of three journal manuscripts (one published, two ready for submission), which are for the most part based on my own theoretical and technical developments, programming, field work and data interpretation. AbstractThis thesis investigates the theory, develops the technology and demonstrates the applicabilities for synchronous in-situ mapping of the magnetic and electric signatures of marine near-surface sediments. A marine electromagnetic profiler has been developed for coastal and shelf operations in 5 to 500 m water depths. The system was designed to resolve subtle and gradual variations in silt and clay content, porosity and diagenesis state of marine sediments at a sub-meter scale. An electromagnetic (EM) induction sensor (Geophex GEM-3)was modified for submarine operations and mounted into a special bottom-towed sled.Seafloor magnetic susceptibility and electric conductivity were calculated from the in-phase and quadrature component of the secondary electromagnetic field using a half-space inversion algorithm. Seawater conductivity was measured synchronously by an integrated conductivitytemperature-depth (CTD) probe. The electric conductivity depends on porosity, the grain-size distribution and conductivity of the pore fluid. Magnetic susceptibility was used in this study as a proxy for fine-grained terrigenous clay/silt content, diagenetically forced magnetite depletion, as well as anthropogenic contaminants.The three attached manuscripts address different applications of the modified EM profiler.The first manuscript develops the physical and technical principles of the method and presents first results regarding the facies, early diagenesis, transport, and deposition of near-surface sediments on the NW Iberian shelf. The second manuscript combines high-resolution acoustic, magnetometric, and electromagnetic profiling with sample-based rock magnetic and geochemical analyses related to submarine groundwater discharge in a Baltic Sea estuary. The third manuscript is an application of the EM profiler to study the contamination of coastal areas by ferrous objects, organic matter and heavy metal pollution for coastal zone management of the Ría de Vigo, a NW Iberian estuary. Chapter 1

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“…Thus, over the last decade, dredge dumping at sea has been monitored by several innovative approaches using natural radionucleides (Venema and de Meijer, 2001), acoustic techniques (Wienberg and Bartholomä , 2005), and particle-size distributions combined with metal concentration analyses (Okada et al, 2009). Besides, environmental magnetism techniques have been used for monitoring heavy metals (Akinyemi et al, 2012;Franke et al, 2009;Pozza et al, 2004), inputs of anthropogenic magnetic spherules (Horng et al, 2009), artificial alpha-radioactivity (McCubbin et al, 2000), as well as petroleum hydrocarbons (Venkatachalapathy et al, 2011) in human-impacted sedimentary systems. However, to our knowledge, no dispersal monitoring of In this study, we developed a novel approach for fingerprinting dredged-dumped sediments at sea using magnetic susceptibility.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of dredged-dumped sediment dispersal off the Bay of the Seine (northern France) using environmental magnetism

Nizou

Demory

Dubrulle-Brunaud

2015

Comptes Rendus. Géoscience

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Lake-based magnetic mapping of contaminated sediment distribution, Hamilton Harbour, Lake Ontario, Canada

Cited by 29 publications

References 30 publications

Data‐fused digital bathymetry and side‐scan sonar as a base for archaeological inventory of submerged landscapes in the Rideau Canal, Ontario, Canada

Data‐fused digital bathymetry and side‐scan sonar as a base for archaeological inventory of submerged landscapes in the Rideau Canal, Ontario, Canada

Characterization of marine near-surface sediments by electromagnetic profiling

Monitoring of dredged-dumped sediment dispersal off the Bay of the Seine (northern France) using environmental magnetism

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