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(newest | oldest) View (newer 50 | older 50) (20 | 50 | 100 | 250 | 500)- 09:08, 31 August 2024 Dronkers J (talk | contribs) uploaded File:SeabedRipples.jpg (Seabed ripples. Photo credit Julia Harwood.)
- 12:31, 30 August 2024 Dronkers J (talk | contribs) uploaded a new version of File:PhaseLead.jpg (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/>).)
- 11:37, 30 August 2024 Dronkers J (talk | contribs) uploaded File:PhaseLead.jpg (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/>).)
- 19:02, 22 August 2024 Dronkers J (talk | contribs) uploaded File:Bedform7.jpg (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.)
- 19:00, 22 August 2024 Dronkers J (talk | contribs) uploaded File:Bedform6.jpg (Flow pattern adjusted to a bed perturbation similar as in Fig. 5, but with the flow direction reversed.)
- 18:58, 22 August 2024 Dronkers J (talk | contribs) uploaded File:Bedform5.jpg (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.)
- 18:29, 22 August 2024 Dronkers J (talk | contribs) uploaded File:Bedform4.jpg (Transport of vorticity (rotational component of velocity) at the ripple trough and ripple crest.)
- 18:29, 22 August 2024 Dronkers J (talk | contribs) uploaded File:Bedform3.jpg (The velocity profiles at the ripple trough and the ripple crest corresponding to the contraction-divergence of the streamlines.)
- 18:27, 22 August 2024 Dronkers J (talk | contribs) uploaded File:Bedform2.jpg (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...)
- 18:26, 22 August 2024 Dronkers J (talk | contribs) uploaded File:Bedform1.jpg (Steady flow streamlines over an emerging bed ripple in a vertical longitudinal section.)
- 10:17, 12 August 2024 Dronkers J (talk | contribs) uploaded a new version of File:WaveAngles.jpg (Wave incidence angles in a 1-line model where the breaker contour line is parallel to the shoreline.)
- 20:11, 10 August 2024 Dronkers J (talk | contribs) deleted page Impacts from maritime transport (content was: "Impacts from from oil spills on coastal zones often regard losses of biodiversity, of environmental quality or of other non-use or passive-use values, which are difficult to estimate with traditional techniques and concepts o...")
- 10:18, 9 August 2024 Dronkers J (talk | contribs) uploaded File:BumpheadParrotfish JennyHuang.jpg (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...)
- 19:39, 3 August 2024 Dronkers J (talk | contribs) uploaded File:NileDeltaDuneFences.jpg (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”.)
- 16:00, 3 August 2024 Dronkers J (talk | contribs) uploaded a new version of File:ChadwickFig2a.jpg (Wave transformations at Bigbury bay, Devon, England. Photograph courtesy of Dr S M White.)
- 19:15, 21 June 2024 Dronkers J (talk | contribs) uploaded File:EkmanBottomLayer.jpg (Velocity veering in the Ekman bottom layer.)
- 20:23, 20 June 2024 Dronkers J (talk | contribs) deleted page Coriolis effect (content was: "{{Definition|title=Coriolis effect|definition=An apparent force that arises because of the earth's spin around its axis. Freely-moving objects are deflected to the right of their direction of motion in the northern hemisphere and to the...")
- 20:22, 20 June 2024 Dronkers J (talk | contribs) deleted page Geostrophic current (content was: "{{Definition|title=Geostrophic current|definition=A current controlled by a balance between a pressure-gradient force and the Coriolis...", and the only contributor was "Ktopke" (talk))
- 13:38, 20 June 2024 Dronkers J (talk | contribs) uploaded File:EkmanTransport.jpg (EkmanTransport.jpg Alongshore wind (coast at the left in the Northern hemisphere) produces offshore Ekman transport in the upper Ekman layer. This offshore transport is compensated by onshore flow at depth and upwelling.)
- 15:02, 16 June 2024 Dronkers J (talk | contribs) uploaded File:MeteotsunamisCiutadella.jpg (Meteo tsunami at Ciutadella (Menorca,Spain) on 15 September 2021. Red curve = atmospheric pressure perturbation, blue curve = harbor oscillation Ciutadella, green curve = mid-troposphese wind speed. Redrawn from Villalonga et al. (2024<ref>Villalonga,...)
- 20:38, 2 June 2024 Dronkers J (talk | contribs) uploaded File:WaveOrbits.jpg (Particle displacements for deep and transitional waves.)
- 19:50, 2 June 2024 Dronkers J (talk | contribs) uploaded File:DefSinusWave.jpg (Definition sketch for a sinusoidal wave.)
- 16:06, 23 May 2024 Dronkers J (talk | contribs) deleted page Coves - artificial formation and use (content was: "{{Review |name=Andrew Chadwick |AuthorID= 11189 }} The formation of a cove can occur naturally (between to headlands) or artificially (between two coastal structures) and has specific functional characteristics. The cove conce...")
- 15:13, 23 May 2024 Dronkers J (talk | contribs) uploaded File:CoveTGroinMorph.jpg (Equilibrium morphology of an artificial cove formed by T-groynes.)
- 21:05, 16 May 2024 Dronkers J (talk | contribs) uploaded File:SeabedRipplesBahamas.jpg (Symmetrical ripples in biogenic, aragonitic sand (shallow subtidal seafloor just offshore from Sand Dollar Beach, nw San Salvador Island, eastern Bahamas). Photo credit James St. John. Creative Commons Licence)
- 21:04, 16 May 2024 Dronkers J (talk | contribs) uploaded File:RiverBedRipplesKennetcookRiver.jpg (Current-generated linguoid ripples, Kennetcook River, Nova Scotia, Canada. Photo credit J. Waldron https://sites.ualberta.ca/~jwaldron/)
- 21:03, 16 May 2024 Dronkers J (talk | contribs) uploaded File:CurrentRipplesMSM.jpg (Current ripples in a fine-sediment channel bed, Baie du Mont Saint Michel.)
- 21:02, 16 May 2024 Dronkers J (talk | contribs) uploaded File:AntidunesWillametteRiver.jpg (Antidunes in the Willamette River (USA). Photo credit Marli Miller. https://geologypics.com/)
- 16:51, 16 May 2024 Dronkers J (talk | contribs) uploaded File:BedformDiagram.jpg (Bedform stability diagram for unidirectional currents. Redrawn after Southard and Boguchwal (1990).)
- 10:52, 16 May 2024 Dronkers J (talk | contribs) uploaded a new version of File:RippleModels.jpg (Empirical ripple prediction formulas. Left: Predictions of the ripple height. Right: Predictions of the ripple wavelength.)
- 13:24, 15 May 2024 Dronkers J (talk | contribs) uploaded File:RippleModels.jpg (Empirical ripple prediction formulas. Left: Predictions of the ripple height. Right: Predictions of the ripple wavelength.)
- 10:39, 10 May 2024 Dronkers J (talk | contribs) uploaded a new version of File:DAPPScheme.jpg (Steps of the Dynamic Adaptation Policy Pathways approach. From Haasnoot et al. (2013))
- 10:15, 10 May 2024 Dronkers J (talk | contribs) uploaded File:DAPPScheme.jpg (Steps of the Dynamic Adaptation Policy Pathways approach. From Haasnoot (2013))
- 16:42, 4 May 2024 Dronkers J (talk | contribs) uploaded File:MytilicultureSaintMichel.jpg (Mussel farm in Baie du Mont Saint Michel (France). Mussel cultivating takes place on poles (bouchots) drilled deep into the seabed. For seed collection, a coconut fiber rope is wrapped in a spiral around the post. When time comes for grow-out, a nettin...)
- 15:23, 28 April 2024 Dronkers J (talk | contribs) uploaded a new version of File:DepositionFluxFlocs.jpg (Deposition flux of flocculated sediment from the San Francisco Bay tested in a flume. Modified from Mehta et al. (2014))
- 14:55, 28 April 2024 Dronkers J (talk | contribs) uploaded File:DepositionFluxFlocs.jpg (Deposition flux of flocculated sediment from the San Francisco Bay tested in a flume. Modified from Mehta et al. 2014.)
- 09:14, 28 April 2024 Dronkers J (talk | contribs) uploaded File:SettlingvelocityBarataria.jpg (Settling velocity as function of the velocity shear rate measured in Barataria basin (USA Gulf coast). Redrawn after McDonell et al. (2024).)
- 16:02, 27 April 2024 Dronkers J (talk | contribs) uploaded a new version of File:OsmosisProcess.jpg (Osmosis through a semi-permeable membrane that allows passage of solvent molecules (blue) while blocking the passage of solute molecules (red).)
- 12:23, 22 April 2024 Dronkers J (talk | contribs) uploaded File:Lysocline.jpg (Zones of calcite and aragonite dissolution. Redrawn after Harris et al. (2023).)
- 18:55, 15 April 2024 Dronkers J (talk | contribs) uploaded File:RippleRegimeTransportCompressed.gif (Wave-induced sand transport over a seabed ripple. Courtesy Jebbe van der Werf.)
- 16:59, 6 April 2024 Dronkers J (talk | contribs) uploaded a new version of File:BeachClassification.jpg (Beach morphologies according to the parameters <math>\Omega</math> and <math>RTR</math>. Reflective beaches are found in the red zone and dissipative beaches in the blue zone.)
- 13:34, 4 April 2024 Dronkers J (talk | contribs) uploaded File:MangroveRootSystems.jpg (Mangrove root systems. Avicennia, Rhizophora and Bruguiera, from left to right, after Marchand (2008))
- 15:23, 1 April 2024 Dronkers J (talk | contribs) uploaded File:BeachRockBrazil.jpg (Beachrock along the Brazilian coast.)
- 15:12, 31 March 2024 Dronkers J (talk | contribs) uploaded File:WaveTransmissionEasternScheldtOysterReef.jpg (Comparison of Eq. (1) (red dashed line) with the wave transmission coefficient measured (blue/green/yellow dots)on an oyster reef in the Eastern Scheldt (Netherlands). Insert: Shape of the oyster reef.)
- 13:48, 30 March 2024 Dronkers J (talk | contribs) uploaded File:PontoonBreakwaters.jpg (Different types of pontoon breakwaters.)
- 19:16, 28 March 2024 Dronkers J (talk | contribs) uploaded File:SubmergedBreakwaterErosionSedimentation.jpg (Flow circulation patterns behind a submerged breakwater for shore-normal wave incidence. Beach erosion or beach accretion may occur depending on the type of circulation pattern.)
- 20:34, 26 March 2024 Dronkers J (talk | contribs) uploaded File:ColumnRevetment.jpg (Column revetment of Marazion sea wall, Cornwall, United Kingdom. Credit: Charles Gould. Licensed under Creative Commons)
- 17:24, 3 March 2024 Dronkers J (talk | contribs) deleted page Economic valuation of goods and services of the UK coastal zone (content was: " This article illustrates an attempt to estimate the value of ecosystem goods and services for a concr...", and the only contributor was "Dronkers J" (talk))
- 16:21, 2 March 2024 Dronkers J (talk | contribs) restored page Marine biological valuation maps - an example from Belgium (31 revisions)
- 18:09, 27 February 2024 Dronkers J (talk | contribs) uploaded File:WavePlungeLipari.jpg (Plunging wave, still from the video by Vincentz 2013 https://zenodo.org/records/8070591 under licence CC Y-SA (attribution and share-alike).)
