A side-scan sonar and high-resolution Chirp sub-bottom profile study of the natural and anthropogenic sedimentary record of Lower Lough Erne, northwestern Ireland

Lafferty, B; Quinn, Rory; Breen, Colin

doi:10.1016/j.jas.2005.10.007

Cited by 44 publications

(35 citation statements)

References 31 publications

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“…These submerged landscapes are now a major focus of underwater archaeological investigation because they potentially contain a large proportion of the prehistoric record of human settlement on coasts (Quinn, Cooper, & Williams, 2000;Flemming, 2004;Lafferty, Quinn, & Breen. 2006;Loewen, Chapeldaine, & Richard, 2006).…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Another problem with low frequency is occasionally significant leaps in profiles, especially in places where the frequency managed to penetrate the vegetation or mud. In order to perform a detailed analysis, a sediment profiler with a frequency of up to 15 kHz should be used to gain detailed information about the layers on the lake's bottom (Lafferty et al, 2005;Pribičević et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…This also indicated significant differences in the levels of muddy deposits. In order to perform a more detailed analysis, a sediment profiler should be used, featuring a frequency of up to 15 kHz, which could be used to gain detailed information regarding the lake's bottom (Lafferty et al, 2005;Pribičević et al, 2007). Since the lake is shallow, and water transparency during the survey was relatively good, it was relatively easy to determine the features of the lake's bottom and differentiate vegetated from non-vegetated areas.…”

Section: Processing the Bathymetric Datamentioning

confidence: 99%

A comparison of interpolation methods on the basis of data obtained from a bathymetric survey of Lake Vrana, Croatia

Šiljeg¹,

Lozić

Šiljeg

2015

Hydrol. Earth Syst. Sci.

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Abstract. The bathymetric survey of Lake Vrana included a wide range of activities that were performed in several different stages, in accordance with the standards set by the International Hydrographic Organization. The survey was conducted using an integrated measuring system which consisted of three main parts: a single-beam sonar HydroStar 4300 and GPS devices; a Ashtech ProMark 500 base, and a Thales Z-Max ® rover. A total of 12 851 points were gathered.In order to find continuous surfaces necessary for analysing the morphology of the bed of Lake Vrana, it was necessary to approximate values in certain areas that were not directly measured, by using an appropriate interpolation method. The main aims of this research were as follows: (a) to compare the efficiency of 14 different interpolation methods and discover the most appropriate interpolators for the development of a raster model; (b) to calculate the surface area and volume of Lake Vrana, and (c) to compare the differences in calculations between separate raster models. The best deterministic method of interpolation was multiquadric RBF (radio basis function), and the best geostatistical method was ordinary cokriging. The root mean square error in both methods measured less than 0.3 m.The quality of the interpolation methods was analysed in two phases. The first phase used only points gathered by bathymetric measurement, while the second phase also included points gathered by photogrammetric restitution.The first bathymetric map of Lake Vrana in Croatia was produced, as well as scenarios of minimum and maximum water levels. The calculation also included the percentage of flooded areas and cadastre plots in the case of a 2 m increase in the water level. The research presented new scientific and methodological data related to the bathymetric features, surface area and volume of Lake Vrana.

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“…Shallow gas features can be formed in diverse environments such as in sea-beds and on continental shelves (SCHROOT; SCHÜTTENHELM, 2003;EMEIS et al, 2004, respectively), loughs (LAFFERTY et al, 2006) or bays BENNIKE, 2009;KARNAUKH et al, 2016) and rías (DIEZ et al, 2007;GARCIA-GIL et al, 2002;DUARTE et al, 2007;IGLESIAS;, since these environments provide favorable conditions for their formation. In Brazil, the presence of these features has been described by various authors such as VITAL and STATTEGGER (1997) in the lowest stretch of the Amazon River; FIGUEIREDO and NITTROUER (1995) and FIGUEIREDO et al (1996) in the Amazon submarine delta and COSTA and FIGUEIREDO (1998) on the Amazon Continental Shelf; BAPTISTA NETO et al (2011) in Rodrigo de Freitas Lagoon -Rio de Janeiro; BENITES et al (2015) in Saco do Mamangua, Rio de Janeiro; BAPTISTA NETO et al (1996), QUARESMA et al (2000) and CATANZARO et al (2004) in Guanabara Bay, Rio de Janeiro; WESCHENFELDER et al (2006) in Patos Lagoon -Rio Grande do Sul associated with low-lying paleotopographical features such as paleo river channels and/or valleys; SCHWARZER et al (2006) in the Rio Açu Canyon and FRAZÃO and VITAL (2007) in the Potengy estuary, both in Rio Grande do Norte; FÉLIX (2012) in the Bertioga Channel, São Paulo;andSOUZA et al (2011), DEMARCO et al (2012), GUESSER et al (2012) andWESCHENFELDER et al (2016) presented preliminary results for the North Bay and the Conceição Lagoon -on the Santa Catarina Coast (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Shallow gas seismic structures: forms and distribution on Santa Catarina Island, Southern Brazil

et al. 2016

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This paper presents the spatial distribution of shallow gas structures and classifies them on the basis of two different data sets of CHIRP seismic records, one from the Conceição Lagoon (CL) and the other from North Bay (NB), both on Santa Catarina Island, Southern Brazil. Side scan sonar data from the CL were used to facilitate the understanding. The sub bottom (SB) seismic data were processed and interpreted by means of the SeisPrho software, the side scan sonar (SSS) data by SonarWiz5 software and the spatial extension being measured with the help of GIS. The shallow gas structures were defined in accordance with their shapes in the seismic recordings (echo-character). At the CL, shallow gas accumulations were found in the form of seepages and features presenting shallow gas structures between the surface and 8.20 ms (around 12.3 m). Accumulations of gas were found in the form of Acoustic Blanking with Acoustic Plume, and also Black Shadows. Pockmarks were found on the lagoon floor and associated with gas seepages (average size diameter 0.97 ± 0.19 m and density from 54 to 242 units per 50 m2). In the NB three types of shallow gas features were found in the seismic profile, namely Acoustic Blanking, Turbidity Pinnacles and Intra-sedimentary plumes. The depth varied from the surface to 12.10 ms (around 18.15 m). In both environments, the gas is escaping from the sediment into the water column. The Pockmarks in the CL and the Acoustic Plume features and sediment rich in total sulfur in the NB validate these findings.

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A side-scan sonar and high-resolution Chirp sub-bottom profile study of the natural and anthropogenic sedimentary record of Lower Lough Erne, northwestern Ireland

Cited by 44 publications

References 31 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

A comparison of interpolation methods on the basis of data obtained from a bathymetric survey of Lake Vrana, Croatia

Shallow gas seismic structures: forms and distribution on Santa Catarina Island, Southern Brazil

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