Peat Mapping Associations of Airborne Radiometric Survey Data
<p>(<b>a</b>) HiRES airborne geophysical surveys in the UK (2008–2013), coloured areas. The recent survey in the Republic of Ireland is labeled (TB, Tellus Border). Arrows denote the four areas studied here. (<b>b</b>) The airborne survey areas (red polygons) overlaid on the DiGMAPGB50 UK mapping of peat (onshore black contours). BNG refers to British National Grid.</p> ">
<p>Theoretical attenuation behaviour of soil/bedrock types. The parameters defining the soil types are discussed in the text. (<b>a</b>) Variation with thickness assuming a uniform half-space. A 90% attenuation level provides a reference level. (<b>b</b>) Variation with degree of saturation (soil moisture or moisture content). Other soil parameters are noted in the text.</p> ">
<p>(<b>a</b>) Radiometric data from the Ayrshire survey shown as a ternary colour image (a 3-way colour stretch of the Potassium, Thorium and Uranium components) of the data. WB denotes a water body. Circles denote two lowland areas of peat. (<b>b</b>) Areas of peat defined by DiGMAPGB50 mapping of peat (zones in black). Infilled area (in the south and east) defines elevations greater than 200 m. Red rectangle is a 3 × 3 km area of peat that is used for a more detailed study.</p> ">
<p>The 3 × 3 km detailed study area from the Ayrshire survey. (<b>a</b>) 1:50 k base topographic map with peat areas shown with transparent infill. “A” denotes a water body and “B” identifies a landfill. (<b>b</b>) Colour image of the radiometric DOSE data with peat outline in white. White dots denote airborne survey sampling along E–W flight lines.</p> ">
<p>The 11 × 10 km study area from the northern Midlands survey. (<b>a</b>) 1:50 k base topographic map with peat areas shown with red line polygons. Areas with grey transparent infill denote eight Ramsar wetland sites. Sites identified are: FM = Fenn’s and other Mosses, HM = Hanmer Mere (non-peat), LB = Llyn Bedydd (non-peat), WM = White Mere (largely non-peat), CLM = Clarepool Moss, CM = Cole Mere, SCM = Sweat and Crose Mere, BM = Brownheath Mere. Note that Ellesmere Mere (EM, non-Ramsar) is largely water. (<b>b</b>) Radiometric DOSE response across the area, shown as coloured contours with an upper limit of 15 nGy·h<sup>−1</sup>. Peat areas shown with red line polygons.</p> ">
<p>The 11 × 10 km study area from the northern Midlands survey. Peat areas are shown with red line polygons. Blue areas denote water bodies. Grey areas denote areas in which radiometric DOSE response is < 12 nGy·h<sup>−1</sup>. Black dots show airborne survey sampling along E–W flight lines (400 m line separation) and N–S tie lines (1,200 m line separations).</p> ">
<p>The 2 × 3 km study area (mainland area of Anglesey survey) across an area of afforested peat. (<b>a</b>) Perspective view, looking north, of aeriel image draped on DTM, with white dots showing airborne sampling locations. White polygons denote areas of peat. (<b>b</b>) 1:50 k base topographic map with colour contours of the radiometic DOSE response limited to values <22 nGy·h<sup>−1</sup>. Red polygons denote areas of peat. WB denotes a water body.</p> ">
<p>The 12 × 10 km study area across the Slieve Beagh blanket bog in both Northern Ireland and the Republic of Ireland. (<b>a</b>) Perspective view, looking north, with ariel image draped on DTM. Ramsar site shown by red contour (extends to border). Mapped peat locations (DiGMAPGB50) shown by white contours. (<b>b</b>) Orthographic view of ariel image with mapped peat locations (DiGMAPGB50, UK) shown by white contours. Red contours denote peat (soil) mapping in the Republic of Ireland (RoI). Yellow contours denote CORINE land-use mapping of peat bogs (UK and R0I). ING refers to Irish National Grid coordinates.</p> ">
<p>The 12 × 10 km study area across the Slieve Beagh blanket bog in both Northern Ireland and the Republic of Ireland. (<b>a</b>) Radiometric DOSE data shown as continuous colour image, limited to 20 nGy·h<sup>−1</sup>. Black contours denote peat locations. Two water bodies are labelled WB. Areas “A” and “B” are discussed in the text. (<b>b</b>) Radiometric DOSE data shown as contours, limited to 6 nGy·h<sup>−1</sup>. Black contours denote peat locations. Infill background colours denote bedrock geology: LG (Leitrim Group), MSF (Marine Shelf Facies), TG (Tyrone Group).</p> ">
Abstract
:1. Introduction
2. Theory
3. Methodology
3.1. Airborne Radiometric Data
3.2. Peat Mapping
4. Results
4.1. Ayrshire Survey
4.2. Lowland Raised Bog, Mere, Fens and Ramsar Sites
4.3. Afforested Peat
4.4. Upland Blanket Bog
5. Conclusions
Acknowledgments
Conflict of Interest
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Window | Nuclide | Energy Range (MeV) |
---|---|---|
Thorium(eTh) | 208Tl (2.61 Mev) | 2.41–2.81 |
Uranium (eU) | 214Bi (1.76 Mev) | 1.66–1.86 |
Potassium (%K) | 40K (1.46 MeV) | 1.37–1.57 |
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Beamish, D. Peat Mapping Associations of Airborne Radiometric Survey Data. Remote Sens. 2014, 6, 521-539. https://doi.org/10.3390/rs6010521
Beamish D. Peat Mapping Associations of Airborne Radiometric Survey Data. Remote Sensing. 2014; 6(1):521-539. https://doi.org/10.3390/rs6010521
Chicago/Turabian StyleBeamish, David. 2014. "Peat Mapping Associations of Airborne Radiometric Survey Data" Remote Sensing 6, no. 1: 521-539. https://doi.org/10.3390/rs6010521