| Abstract: | Seafloor pockmarks occur worldwide and may represent millions of m3 of continental shelf erosion, but few numerical analyses of their morphology and spatial distribution of pockmarks exist. We introduce a quantitative definition of pockmark morphology and, based on this definition, propose a three-step geomorphometric method to identify and extract pockmarks from high-resolution swath bathymetry. We apply this GIS-implemented approach to 25km2 of bathymetry collected in the Belfast Bay, Maine USA pockmark field. Our model extracted 1767 pockmarks and found a linear pockmark depth-to-diameter ratio for pockmarks field-wide. Mean pockmark depth is 7.6m and mean diameter is 84.8m. Pockmark distribution is non-random, and nearly half of the field‘s pockmarks occur in chains. The most prominent chains are oriented semi-normal to the steepest gradient in Holocene sediment thickness. A descriptive model yields field-wide spatial statistics indicating that pockmarks are distributed in non-random clusters. Results enable quantitative comparison of pockmarks in fields worldwide as well as similar concave features, such as impact craters, dolines, or salt pools. ?? 2010. |
| Genre: | Article |
| ProdID: | 70037577 |
| Citation Author: | Andrews, B. D.; Brothers, L. L.; Barnhardt, W. A. |
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| Citation End Page: | 64 |
| Citation Issue: | 1-2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geomorphology |
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| Citation Number Of Pages: | 10 |
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| Citation Search Results Text: | Automated feature extraction and spatial organization of seafloor pockmarks, Belfast Bay, Maine, USA; 2010; Article; Journal; Geomorphology; Andrews, B. D.; Brothers, L. L.; Barnhardt, W. A. |
| Citation Start Page: | 55 |
| Citation Volume: | 124 |
| Citation Year: | 2010 |
| Type: | citation/reference |
| Text: | Automated feature extraction and spatial organization of seafloor pockmarks, Belfast Bay, Maine, USA; 2010; Article; Journal; Geomorphology; Andrews, B. D.; Brothers, L. L.; Barnhardt, W. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/j.geomorph.2010.08.009 |
| Date Other: | Fri, 1 Jan 2010 00:00 -0600 |
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