Citation:

PANGAEA.944595

Name: Morphometric parameters of the Coral Belt Mounds (CBM), Namibian coral mound province
Published: 2022-05-25
License: https://creativecommons.org/licenses/by/4.0/
Keywords: cold-water coral; coral mounds; Lophelia pertusa; Morphometry

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Abstract:

Quantitative morphometric analyses were carried out for each mound following the workflows presented by Purkis et al. (2007) The coral mound base was defined following the methodological approach of Correa et al. (2012) using the dip angle map, generated from the digital elevation model (DEM), to extract closed polygons that follow the 3°-contour line. This 3°-cutoff has been qualitatively validated with a comparison between the DEM and the dip angle. Small-scaled polygons within mound perimeters and resulting from bathymetry artefacts were filtered out. Manual editing was applied to split simple merged mound structures (e.g. twin-peak mounds) based on higher cut-off slope values (4-5°). Furthermore, polygons describing the mound footprint have been corrected to remove unrealistic shapes especially common for the CBM. The DEM was subsequently re-gridded to generate hypothetical bathymetric maps without mounds, for which the vertical relief beneath each removed mound was interpolated from the mound perimeters. The newly interpolated surfaces were then subtracted from the original DEMs to evaluate the volume and heights of the coral mounds. Only features with a footprint area greater than 900 suared meters (corresponding to a two-dimensional array of 3 × 3 DEM grid cells) and with a height of >2 m above the surrounding seafloor (4 × 0.5 m of vertical precision) were considered as coral mounds and quantitatively analyzed.

Keyword(s):

cold-water coral; coral mounds; Lophelia pertusa; Morphometry

Supplement to:

Tamborrino, Leonardo; Titschack, Jürgen; Wienberg, Claudia; Purkis, Sam; Eberli, Gregor P; Hebbeln, Dierk (2022): Spatial distribution and morphometry of the Namibian coral mounds controlled by the hydrodynamic regime and outer-shelf topography. Frontiers in Marine Science, 9, 877616, https://doi.org/10.3389/fmars.2022.877616

Source:

Hebbeln, Dierk; Bender, Maren; Eichstädter, Rene; Gori, Andrea; João, Francisco; Moçambique, Irene; Orejas, Covadonga; Titschack, Jürgen; Wefing, Anne-Marie; Wienberg, Claudia; Wintersteller, Paul (2023): Multibeam bathymetry raw data (Kongsberg EM710 entire dataset) of RV METEOR during cruise M122. PANGAEA, https://doi.org/10.1594/PANGAEA.945015

Wintersteller, Paul (2019): Gridded bathymetry from EM1002 multibeam echosounder of RV MARIA S. MERIAN cruise MSM20/1 (Walvis Ridge). PANGAEA, https://doi.org/10.1594/PANGAEA.901949

Further details:

Correa, Thiago B S; Grasmueck, Mark; Eberli, Gregor P; Reed, John K; Verwer, Klaas; Purkis, Sam (2012): Variability of cold-water coral mounds in a high sediment input and tidal current regime, Straits of Florida. Sedimentology, 59(4), 1278-1304, https://doi.org/10.1111/j.1365-3091.2011.01306.x

Peura, M; Iivarinen, J (1997): Efficiency of simple shape descriptors. In: Advances in visual form analysis (Eds A. C., L.P. Cordella and G. Sanniti di Baja), World Scientific, Singapore, 443-451

Purkis, Samuel J; Kohler, Kevin E; Riegl, Bernhard M; Rohmann, Steven O (2007): The Statistics of Natural Shapes in Modern Coral Reef Landscapes. The Journal of Geology, 115(5), 493-508, https://doi.org/10.1086/519774

Funding:

German Research Foundation (DFG), grant/award no. 390741603 : EXC 2077: The Ocean Floor – Earth's Uncharted Interface

Coverage:

Median Latitude: -20.856883 * Median Longitude: 12.864177 * South-bound Latitude: -20.998986 * West-bound Longitude: 12.787524 * North-bound Latitude: -20.648119 * East-bound Longitude: 12.936034

Date/Time Start: 2012-01-06T00:00:00 * Date/Time End: 2016-01-11T05:45:00

Minimum Elevation: -290.0 m * Maximum Elevation: -149.0 m

Event(s):

GeoB20502-1 (M122_1348-1) * Latitude Start: -20.788000 * Longitude Start: 12.786000 * Latitude End: -20.788000 * Longitude End: 12.765000 * Date/Time Start: 2015-12-30T23:46:00 * Date/Time End: 2015-12-31T08:35:00 * Elevation Start: -260.0 m * Elevation End: -290.0 m * Campaign: * Basis: * Method/Device: (MB_PS)

GeoB20509-1 (M122_004-1) * Latitude Start: -20.680000 * Longitude Start: 12.837000 * Latitude End: -20.603000 * Longitude End: 12.862000 * Date/Time Start: 2016-01-01T20:47:00 * Date/Time End: 2016-01-02T05:35:00 * Elevation Start: -222.0 m * Elevation End: -153.0 m * Campaign: * Basis: * Method/Device: (MB_PS)

GeoB20526-1 (M122_021-1) * Latitude Start: -20.733000 * Longitude Start: 12.813000 * Latitude End: -20.697000 * Longitude End: 12.802000 * Date/Time Start: 2016-01-03T17:59:00 * Date/Time End: 2016-01-04T05:47:00 * Elevation Start: -210.0 m * Elevation End: -242.0 m * Campaign: * Basis: * Method/Device: (MB_PS)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Identification	ID		Tamborrino, Leonardo	Mound footprint polygon
2	Number of nodes	N nodes	#	Tamborrino, Leonardo	Mound footprint polygon
3	LONGITUDE	Longitude		Tamborrino, Leonardo	Mound footprint polygon	Geocode – CENTROID E
4	LATITUDE	Latitude		Tamborrino, Leonardo	Mound footprint polygon	Geocode – CENTROID N
5	Perimeter	Perimeter	m	Tamborrino, Leonardo	Mound footprint polygon
6	Net area	Net area	m²	Tamborrino, Leonardo	Mound footprint polygon
7	Bounding area	Bound area	m²	Tamborrino, Leonardo	Mound footprint polygon
8	Principal axes ratio	PAR		Tamborrino, Leonardo	Mound footprint polygon
9	Convexity	Convexity		Tamborrino, Leonardo	Mound footprint polygon
10	Compactness	Compactness		Tamborrino, Leonardo	Mound footprint polygon
11	Circular variance	Circular variance		Tamborrino, Leonardo	Mound footprint polygon
12	Direction of principal axis	PAX angle	deg	Tamborrino, Leonardo	Mound footprint polygon
13	Length of principal axis	PAX length	m	Tamborrino, Leonardo	Mound footprint polygon
14	Length of axis ortoghonal to PAX	OPAX length	m	Tamborrino, Leonardo	Mound footprint polygon
15	Distance from nearest polygon	Nearest neighbour dist		Tamborrino, Leonardo	Mound footprint polygon
16	Nearest polygon identification number	NN ID		Tamborrino, Leonardo	Mound footprint polygon
17	Dimension, fractal	D3		Tamborrino, Leonardo	Mound footprint polygon
18	Parameter	Parameter	arbitrary units	Tamborrino, Leonardo	Mound footprint polygon	R2 at roll off
19	Fractal Span	Fractal Span		Tamborrino, Leonardo	Mound footprint polygon
20	DEPTH, water	Depth water	m	Tamborrino, Leonardo	Mound footprint polygon	Geocode – Centroid Depth mbsl
21	Depth, top/min	Depth top	m	Tamborrino, Leonardo	Mound footprint polygon	Min Depth mbsl
22	Depth, bottom/max	Depth bot	m	Tamborrino, Leonardo	Mound footprint polygon	Max Depth mbsl
23	DEPTH, water	Depth water	m	Tamborrino, Leonardo	Mound footprint polygon	Geocode – Mean Depth mbsl
24	Depth, difference	Depth diff	m	Tamborrino, Leonardo	Mound footprint polygon	Depth Variance mbsl
25	Depth, mode	Depth mode	m	Tamborrino, Leonardo	Mound footprint polygon	mbsl
26	Depth, median	Depth median	m	Tamborrino, Leonardo	Mound footprint polygon	mbsl
27	Ratio between 3D surface and planar surface	Surface/Planar ratio		Tamborrino, Leonardo	3D relief of the coral mound/coral mound footprint polygon
28	Volume	Vol	m³	Tamborrino, Leonardo	3D relief of the coral mound
29	Direction	Direction		Tamborrino, Leonardo	3D relief of the coral mound	AVG_ASPECT
30	ELEVATION	Elevation	m a.s.l.	Tamborrino, Leonardo	3D relief of the coral mound	Geocode – AVG_ELEV_M
31	Slope angle	Slope angle	deg	Tamborrino, Leonardo	3D relief of the coral mound	AVG_SLOPE
32	Slope angle	Slope angle	%	Tamborrino, Leonardo	3D relief of the coral mound	AVG_SLOPE
33	Mound height/PAX length ratio	MH/PAX		Tamborrino, Leonardo	3D relief of the coral mound
34	Height of mound	Max elev	m	Tamborrino, Leonardo	3D relief of the coral mound
35	Slope	Slope	deg	Tamborrino, Leonardo	3D relief of the coral mound	MAX_SLOPE_DEG
36	Slope	Slope	%	Tamborrino, Leonardo	3D relief of the coral mound
37	Elevation, standard deviation	Elev std dev	±	Tamborrino, Leonardo	3D relief of the coral mound	STD_DEV_ELEV_M
38	Slope, standard deviation	Slope std dev	±	Tamborrino, Leonardo	3D relief of the coral mound	STD_DEV_SLOPE_DEG
39	Slope, standard deviation	Slope std dev	±	Tamborrino, Leonardo	3D relief of the coral mound	STD_DEV_SLOPE_PCT
40	Slope, maximum underlying	Und max slope	deg	Tamborrino, Leonardo	3D relief of the coral mound
41	Slope, maximum underlying	Und max slope	%	Tamborrino, Leonardo	3D relief of the coral mound
42	Slope, average, underlying	Und avg slope	deg	Tamborrino, Leonardo	3D relief of the coral mound
43	Slope, average, underlying	Und avg slope	%	Tamborrino, Leonardo	3D relief of the coral mound
44	Slope, average, underlying standard deviation	Und avg slope std	±	Tamborrino, Leonardo	3D relief of the coral mound	UND_STD_DEV_SLOPE_DEG
45	Slope, average, underlying standard deviation	Und avg slope std	±	Tamborrino, Leonardo	3D relief of the coral mound	UND_STD_DEV_SLOPE_PCT
46	Direction	Direction		Tamborrino, Leonardo	3D relief of the coral mound	UND_AVG_ASPECT

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

22222 data points

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