Trace, A. (2022). Geophysical Survey at Buckmore Park North, Petersfield, Hampshire. Wessex Archaeology. https://doi.org/10.5284/1113126. Cite this using datacite

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Title:		 Geophysical Survey at Buckmore Park North, Petersfield, Hampshire
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Series:		 Wessex Archaeology unpublished report series
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wessexar1-507863_191552.pdf (3 MB) : Download
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DOI
https://doi.org/10.5284/1113126
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Publication Type:		 Report (in Series)
Abstract
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Abstract:		 The cart-based gradiometer system used a Leica Captivate RTK GNSS instrument, which receives corrections from a network of reference stations operated by the Ordnance Survey (OS) and Leica Geosystems. Such instruments allow positions to be determined with a precision of 0.02 m in real-time and therefore exceeds European Archaeologiae Consilium recommendations (Schmidt et al. 2015). The detailed gradiometer survey was undertaken using four SenSYS FGM650/3 gradiometers spaced at 1 m intervals and mounted on a non-magnetic cart. Data were collected with an effective sensitivity of 0.03 nT at a rate of 10 Hz, producing intervals of 0.01 m along transects spaced 4 m apart. A broken linear anomaly was identified bisecting the eastern portion of the site on a north-south orientation. Whilst this feature may pertain to a former field boundary, predating historic maps, it is likely that this anomaly is associated with a drainage gully corresponding to the formal gardens of Buckmore House to the north of the site. This interpretation is further supported by a linear depression noted in LiDAR data. An area of increased magnetic response was noted in the western portion of the site, with a linear dipolar anomaly extending away toward the south-west. Although the anomalies likely pertain to an area of wet ground and a modern service respectively, it is likely these anomalies overlay an earlier water feed to a Hydraulic Ram noted on the OS 25 Inch 1892 – 1914 map. Further, situated at the southern extremity of a field boundary aligned with the linear anomaly on site, is a noted well in Buckmore Farm on the same map. The alignment of the linear anomaly and position of the well suggests a water source for the Ram. LiDAR data further supports this interpretation, with a linear depression running from the Hydraulic Ram to the field boundary to the south. Areas of weak positive anomalies were identified across the northern portion of the site. These have been interpreted as variation is local geology. A series of three linear trends were noted immediately north of the area of increased magnetic response. It is likely these are associated with the former water feed for the Hydraulic Ram but are too weak to confidently interpret further.
Author
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Author:		 Alastair Trace ORCID icon
Publisher
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Publisher:		 Wessex Archaeology
Year of Publication
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Year of Publication:		 2022
Locations
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Locations:
Parish: Petersfield
Country: England
County: Hampshire
District: East Hampshire
Grid Reference: 473724, 124039 (Easting, Northing)
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MAGNETOMETRY SURVEY (Event)
GEOPHYSICAL SURVEY (Event)
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OASIS Id: wessexar1-507863
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Created Date
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Created Date:		 21 Sep 2023