File list
This special page shows all uploaded files.
| Date | Name | Thumbnail | Size | User | Description | Versions |
|---|---|---|---|---|---|---|
| 17:00, 20 December 2024 | Prochlorococcus.jpg (file) |  |
115 KB | Dronkers J | Cyanobacteria Prochlorococcus spp. Photo credit Derek Tan http://www3.botany.ubc.ca/derek/ Creative commons noncommercial licence | 1 |
| 20:54, 14 December 2024 | MeanGlobalChlorophyll.jpg (file) |  |
88 KB | Dronkers J | Mean global distribution of ocean surface chlorophyll-a from SeaWiFS satellite observations. Image credit NASA. | 1 |
| 15:50, 5 December 2024 | ProcScales.jpg (file) |  |
114 KB | Dronkers J | Temporal and spatial scales of ocean processes | 1 |
| 14:09, 17 November 2024 | BacterialAlgalMat.jpg (file) |  |
46 KB | Dronkers J | Bacterial algae mat. Courtesy Cuadrado, D.G., Perillo, G.M.E. and Vitale, A.J. 2014. Modern microbial mats in siliciclastic tidal flats: Evolution, structure and the role of hydrodynamics. Marine Geology 352: 367-380 | 1 |
| 22:34, 16 November 2024 | Rotifer.jpg (file) |  |
8 KB | Dronkers J | Rotifer ‘’Brachionus manjavacas’’, microscopic planktonic organism. Courtesy: Kristin Gribble. https://www.mbl.edu/research/research-organisms/rotifer | 1 |
| 22:29, 16 November 2024 | Tardigrade.jpg (file) |  |
330 KB | Dronkers J | ''Milnesium tardigradum''. Tardigrades (water bears) are among the most resilient animals known, capable to survive extreme conditions. Courtesy Schokraie, E., Warnken, U., Hotz-Wagenblatt, A., Grohme, M.A., Hengherr, S., et al. 2012. Comparative prote... | 1 |
| 22:13, 16 November 2024 | Ostracod.jpg (file) |  |
37 KB | Dronkers J | The myodocopid ostracod genus ‘’Vargula’’ (sea firefly), famous for its bioluminescence. Courtesy Robin James Smith, https://www.biwahaku.jp/smith/ostracod_predation.html | 1 |
| 22:09, 16 November 2024 | ForaminiferaAnomalinoidesSphericus.jpg (file) |  |
156 KB | Dronkers J | Foraminifera ''Anomalinoides Sphericus‘’. Courtesy Hayward, B.W., Grenfell, H.R., Reid, C.M. and Hayward, K.A. 1999. Recent New Zealand shallow-water benthic Foraminifera: Taxonomy, ecologic distribution, biogeography, and use in paleoenvironmental... | 1 |
| 22:06, 16 November 2024 | Gastropod.jpg (file) |  |
19 KB | Dronkers J | Gastropod ‘’Homalopoma sangarense’’. Courtesy Naturalis Biodiversity Center/Wikimedia Commons | 1 |
| 10:33, 16 November 2024 | BenthicFactors.jpg (file) |  |
48 KB | Dronkers J | Factors affecting benthic organisms in coastal ecosystems. From Satheesh, S. and El-Sherbiny, M.M. 2022. Ecology, distribution, and biogeography of benthos. Ecology and Biodiversity of Benthos, Elsevier, pp. 251-285 | 1 |
| 10:50, 14 November 2024 | VesicomyidClam.jpg (file) |  |
65 KB | Dronkers J | Vesicomyid clams at Southern Hydrate Ridge, hosting symbiotic microbes. This 'colony' is perched at the ledge above a site known as Einstein’s Grotto, at 770 m depth, which in 2013 was actively venting. Photo: NSF-OOI/UW/CSSF; Dive R1750; V14.https:/... | 1 |
| 10:38, 14 November 2024 | MalacosteusNiger.jpg (file) |  |
19 KB | Dronkers J | Malacosteus niger, commonly known as the black dragon fish. M. niger (length 10-20 cm) is a species of deep-sea fish. It is able to produce both red and blue bioluminescence. Photo credit: Ken Graham. Creative Commons Licence (CC BY-NC) | 1 |
| 12:14, 13 November 2024 | HumpbackAnglerfish.jpg (file) |  |
23 KB | Dronkers J | The humpback anglerfish or common black devil (Melanocetus johnsonii). [https://zoo-tycoon-movie.fandom.com/ Creative Commons Attribution NonCommercial license (“CC BY-NC” or “CC BY-NC-SA”)] | 1 |
| 20:55, 12 November 2024 | OceanDepthProfiles.jpg (file) |  |
47 KB | Dronkers J | Typical depth profiles of light, nitrogen and chlorophyll a in the subtropical ocean. Adapted from © 2012 Nature Education, https://www.nature.com/scitable/knowledge/library/the-biological-productivity-of-the-ocean-70631104/ | 1 |
| 20:54, 12 November 2024 | GlobalChlorophyll.jpg (file) |  |
91 KB | Dronkers J | Composite global ocean maps of concentrations of satellite-derived surface chlorophyll concentrations. Left: July, August, September. Right: January, February, March. © 2012 Nature Education https://www.nature.com/scitable/knowledge/library/the-biolo... | 1 |
| 22:42, 7 November 2024 | SlopingSeabed.jpg (file) |  |
11 KB | Dronkers J | Sloping seabed; definition of the axes. | 2 |
| 20:22, 7 November 2024 | EdgeWaveRefraction.jpg (file) |  |
58 KB | Dronkers J | Wave ray of incoming and reflected wave crest (red) and wave ray of incoming wave trough (black line). The edge wave is trapped in a coastal strip of width <math>x_c</math>. | 1 |
| 20:18, 7 November 2024 | EdgeWave.jpg (file) |  |
41 KB | Dronkers J | Principle of wave trapping to the shore by wave refraction and reflection. The wave crest is shown in red at successive times (from left to right), black arrows indicate the wave propagation speed and the dotted line displays the wave ray. | 2 |
| 22:09, 2 November 2024 | SeawallNoSeawall.jpg (file) |  |
53 KB | Dronkers J | A seawall stops shoreline retreat but the beach is lost. Without seawall, the beach is preserved but land is lost (Ruggiero, 2010). Photo credit Chip Fletcher (Hawaii). | 1 |
| 22:51, 30 October 2024 | WaveTransmissionLCB.jpg (file) |  |
99 KB | Dronkers J | Wave transmission over a low-crested breakwater and mathematical symbols. | 1 |
| 22:46, 30 October 2024 | WaveTransmission.jpg (file) |  |
99 KB | Dronkers J | Wave transmission over a low-crested breakwater and mathematical symbols. | 1 |
| 17:42, 30 October 2024 | WaveTransmissionEasternScheldtOysterReef.jpg (file) |  |
70 KB | Dronkers J | Comparison of Eq. (1) (red dashed line) with the wave transmission coefficient measured (blue/green/yellow dots[10]) on an oyster reef in the Eastern Scheldt (Netherlands). Insert: Average cross-shore shape of the oyster reef. | 2 |
| 17:07, 30 October 2024 | WaveReefTransmission.jpg (file) |  |
47 KB | Dronkers J | Wave transmission over an oyster reef and mathematical symbols. The freeboard <math>R_c</math> is negative when the reef crest is below the still water level <math>SWL</math>. | 1 |
| 09:30, 15 October 2024 | SkewWaveTransport.jpg (file) |  |
106 KB | Dronkers J | Horizontal wave orbital velocity <math>U</math> and sediment transport <math>Q</math> averaged over the ripple length for acceleration-skewed waves, velocity-skewed waves and acceleration+velocity-skewed waves. Adapted from Salimi-Tarazouj, A., Tian-Ji... | 1 |
| 15:53, 13 October 2024 | SandwavesNorthSea.jpg (file) |  |
85 KB | Dronkers J | Sand waves in the southern North Sea (insert upper left corner, black dot, depth 35-40 m), imaged by multibeam sonar. An indication of the order of magnitude of the wavelength of the sand waves (ca. 100 m) is given by the shipwreck of the freighter Tim... | 1 |
| 19:12, 12 October 2024 | RotationDamp.jpg (file) |  |
46 KB | Dronkers J | Variation of the ratio <math>|\Psi^+/\Psi^|</math> over the vertical, showing that the anticyclonic velocity component <math>\Psi^-</math> is more strongly damped than the cyclonic component <math>\Psi^+<\math>. | 1 |
| 10:14, 7 October 2024 | SeawaterIntrusion3.jpg (file) |  |
200 KB | Dronkers J | Schematic representation of seawater intrusion into a multi-aquifer system. | 1 |
| 10:11, 1 October 2024 | WindTurbinePileDriving.jpg (file) |  |
79 KB | Dronkers J | Pile driving for the installation of an offshore wind turbine. Source https://www.deingenieur.nl/ | 2 |
| 10:46, 21 September 2024 | PCB.jpg (file) |  |
18 KB | Dronkers J | Molecular structure polychlorinated biphenyl (PCB). | 2 |
| 10:44, 21 September 2024 | Tributyltin.jpg (file) |  |
5 KB | Dronkers J | Molecular structure tributyltin (TBT). | 1 |
| 10:10, 21 September 2024 | EutrophicationZostera.jpg (file) |  |
93 KB | Dronkers J | Overgrown Zostera in the Baltic Sea. Photo credit Metsähallitus. Creative Commons Licence CC BY-SA 2.0 | 1 |
| 15:16, 14 September 2024 | Exchange fluxes mixing.jpg (file) |  |
64 KB | Dronkers J | Exchange fluxes mixed salt-fresh interface | 1 |
| 12:55, 14 September 2024 | GroundwaterTracer.jpg (file) |  |
50 KB | Dronkers J | Determination of submarine groundwater discharge by measuring tracer concentrations <math>c(x)</math>. | 1 |
| 19:16, 10 September 2024 | TurtlePlasticIngest.jpg (file) |  |
68 KB | Dronkers J | Sea turtle eating a plastic bag. Image from https://tontoton.com/how-does-ocean-plastic-affect-marine-wildlife/# | 1 |
| 18:46, 10 September 2024 | PlasticGarbageBeach.jpg (file) |  |
200 KB | Dronkers J | Beach covered with plastic garbage. Photo credit: Mel D Cole/World Bank | 1 |
| 18:45, 10 September 2024 | EntangledTurtle.jpg (file) |  |
73 KB | Dronkers J | A green sea turtle is entangled in an abandoned fishing net. Image courtesy of Doug Helton, NOAA. Wikimedia commons | 1 |
| 21:14, 5 September 2024 | TankerSpillStats23.jpg (file) |  |
53 KB | Dronkers J | Quantities of oil spilled from tanker incidents 1970-2023. From ITOPF website https://www.itopf.org/knowledge-resources/data-statistics/statistics/ | 1 |
| 09:08, 31 August 2024 | SeabedRipples.jpg (file) |  |
377 KB | Dronkers J | Seabed ripples. Photo credit Julia Harwood. | 1 |
| 12:31, 30 August 2024 | PhaseLead.jpg (file) |  |
35 KB | Dronkers J | The phase lead angle <math>\phi</math> of the bed shear stress relative to the bed perturbation as a function of <math>k \, d_{50}</math>. Figure adapted from Charru et al. (2013<ref name=C13/>). | 2 |
| 19:02, 22 August 2024 | Bedform7.jpg (file) |  |
37 KB | Dronkers J | If oscillating flow is assumed to be equivalent to successive periods of steady flow from the right and from the left, then the net resulting flow pattern consists of circulation cells that move sediment grains from the troughs to the crests. | 1 |
| 19:00, 22 August 2024 | Bedform6.jpg (file) |  |
82 KB | Dronkers J | Flow pattern adjusted to a bed perturbation similar as in Fig. 5, but with the flow direction reversed. | 1 |
| 18:58, 22 August 2024 | Bedform5.jpg (file) |  |
90 KB | Dronkers J | The negative vorticity balance on the upstream side of the ripple drives a counterclockwise circulation, while the positive balance on the downstream side drives a clockwise circulation. | 1 |
| 18:29, 22 August 2024 | Bedform4.jpg (file) |  |
78 KB | Dronkers J | Transport of vorticity (rotational component of velocity) at the ripple trough and ripple crest. | 1 |
| 18:29, 22 August 2024 | Bedform3.jpg (file) |  |
60 KB | Dronkers J | The velocity profiles at the ripple trough and the ripple crest corresponding to the contraction-divergence of the streamlines. | 1 |
| 18:27, 22 August 2024 | Bedform2.jpg (file) |  |
63 KB | Dronkers J | The emerging ripple is eroded where the shear stress increases due to contraction of the streamline toward the sediment bed. Accretion occurs where streamlines diverge from the sediment bed. The erosion-accretion boundary is shifted by the saturation l... | 1 |
| 18:26, 22 August 2024 | Bedform1.jpg (file) |  |
52 KB | Dronkers J | Steady flow streamlines over an emerging bed ripple in a vertical longitudinal section. | 1 |
| 10:17, 12 August 2024 | WaveAngles.jpg (file) |  |
105 KB | Dronkers J | Wave incidence angles in a 1-line model where the breaker contour line is parallel to the shoreline. | 2 |
| 10:18, 9 August 2024 | BumpheadParrotfish JennyHuang.jpg (file) |  |
120 KB | Dronkers J | Bumphead parrotfish. Parrotfish contribute to bioerosion by rasping algae from coral and other rocky substrates with their teeth tightly packed on the external surface of their jaw bones. For example, parrotfish grazing accounted for the production of... | 1 |
| 19:39, 3 August 2024 | NileDeltaDuneFences.jpg (file) |  |
270 KB | Dronkers J | Dune development with sand fences for coastal protection (Egypt, 2022). Green Climate Fund project “Enhancing Climate Change Adaptation in the North Coast and Nile Delta Regions”. | 1 |
| 16:00, 3 August 2024 | ChadwickFig2a.jpg (file) |  |
175 KB | Dronkers J | Wave transformations at Bigbury bay, Devon, England. Photograph courtesy of Dr S M White. | 2 |
