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Date Name Thumbnail Size User Description Versions
15:31, 14 April 2020 Cakile.jpg (file) 69 KB Dronkers J Cakile (Searocket) Wikimedia Commons 1
15:30, 14 April 2020 PaspalumVaginatum.jpg (file) 82 KB Dronkers J Paspalum vaginatum (Seashore paspalum) Photo credit: Ravahere Taputuarai 1
15:28, 14 April 2020 PoaBillardierei.jpg (file) 83 KB Dronkers J Poa billardierei (Sand tussock, Hinarepe) Photo credit: Shannel Courtney 1
15:25, 14 April 2020 AcaciaSophorae.jpg (file) 110 KB Dronkers J Acacia sophorae (Coastal Wattle) Photo credit Sheldon Navie 1
15:19, 14 April 2020 UniolaPaniculata.jpg (file) 82 KB Dronkers J Uniola Paniculata (Sea Oats) Photo credit Melissa P 1
22:47, 13 April 2020 SporobolusPumilus.jpg (file) 66 KB Dronkers J Sporobolus pumilus (Spartina patens, Saltmeadow Cordgrass) 1
22:46, 13 April 2020 SpinifexSericeus.jpg (file) 75 KB Dronkers J Spinifex sericeus (Spinifex) 1
22:45, 13 April 2020 PanicumAmarum.jpg (file) 55 KB Dronkers J Panicum amarum (Bitter panicum, coastal panicgrass) 1
11:58, 13 April 2020 AmmophilaArenaria.jpg (file) 26 KB Dronkers J Ammophila arenaria (Marram grass) 1
12:42, 6 April 2020 ElectricalResistivity.jpg (file) 240 KB Dronkers J Electrical resistivity measurement by continuous vertical electrical sounding. 1
22:36, 5 April 2020 PolderSeepage.jpg (file) 505 KB Dronkers J Groundwater seepage into a polder and associated rise of the salt-fresh interface. 2
17:08, 5 April 2020 EstuaryIntrusion.jpg (file) 43 KB Dronkers J Intrusion of seawater from a salt-wedge estuary into the underground. 1
16:28, 5 April 2020 BalanceSaltFresh.jpg (file) 65 KB Dronkers J A small level difference is sufficient to keep a large fresh water column in balance with a salt water column. 1
12:54, 5 April 2020 PhysicalBarrier.jpg (file) 399 KB Dronkers J Physical subsurface barrier at the seaward entrance of an aquifer. 2
12:53, 5 April 2020 HydraulicAbstractionBarrier.jpg (file) 491 KB Dronkers J Hydraulic abstraction barrier at the seaward entrance of an aquifer. 1
12:51, 5 April 2020 HydraulicInjectionBarrier.jpg (file) 497 KB Dronkers J Hydraulic injection barrier at the seaward entrance of an aquifer. 1
12:49, 5 April 2020 Freshkeeper.jpg (file) 296 KB Dronkers J Principle of the freshkeeper system: removal of brackish groundwater to a lower aquifer to make room for storage of fresh water. 1
12:48, 5 April 2020 Freshmaker.jpg (file) 580 KB Dronkers J Principle of the freshmaker system: withdrawal of brackish groundwater to make room for a thick fresh water lens. 1
12:47, 5 April 2020 TemporaryStorage.jpg (file) 578 KB Dronkers J Temporary storage of rainwater. 1
12:46, 5 April 2020 DuneInfiltration.jpg (file) 284 KB Dronkers J Large fresh water reservoir created by dune infiltration. 2
12:43, 5 April 2020 SkimmingWell.jpg (file) 561 KB Dronkers J Horizontal skimming well. The upconing effect is limited by spreading the extraction is spread over a broad zone. 1
12:38, 5 April 2020 PolderDrainage.jpg (file) 584 KB Dronkers J Drainage of a polder causing upconing of brackish water into the ditches. 1
12:37, 5 April 2020 UpconingWell.jpg (file) 339 KB Dronkers J Upconing brackish water under a pumping well. 1
12:35, 5 April 2020 MarineTransgression.jpg (file) 546 KB Dronkers J Infiltration of marine flood water into the underground. 1
12:34, 5 April 2020 GroundwaterExtractionTrends.jpg (file) 48 KB Dronkers J Agricultural groundwater usage for selected countries in billion km3/year. Source: UN World Water Development Report, 2015 1
12:31, 5 April 2020 AirborneTEM.jpg (file) 45 KB Dronkers J SkyTEM team recording Time Domain Electromagnetic Data. Source: G. Oude Essink, https://publicwiki.deltares.nl/ 1
11:24, 5 April 2020 WorldWaterDistribution.png (file) 92 KB Dronkers J World water distribution. Credit: pbslearningmedia. 1
12:16, 4 April 2020 SaltFreshBalance.jpg (file) 32 KB Dronkers J A small level difference is sufficient to keep a large fresh water column in balance with a salt water column, because of the small relative density difference. 1
22:54, 28 March 2020 SubmergedBreakwater.jpg (file) 172 KB Dronkers J Submerged breakwater (negative freeboard). The graph shows the range of values for the wave transmission coefficient obtained from experiments. 1
17:26, 28 March 2020 ReshapingBermBreakwater.jpg (file) 125 KB Dronkers J Fully reshaping berm breakwater. 1
18:40, 21 March 2020 LiquefactionPrinciple.jpg (file) 61 KB Dronkers J Principle of soil liquefaction. 1
20:41, 19 March 2020 FallingApron.jpg (file) 158 KB Dronkers J Principle of the falling apron. 1
20:41, 19 March 2020 ConcreteArmorUnits.jpg (file) 93 KB Dronkers J Examples of concrete armor units. 1
20:40, 19 March 2020 SlipFailure.jpg (file) 131 KB Dronkers J Slip failure of the breakwater core. 1
20:39, 19 March 2020 SeabedLiquefaction.jpg (file) 140 KB Dronkers J Collapse of the armor layer due to seabed liquefaction under the toe of the breakwater. 1
20:38, 19 March 2020 CrownElement.jpg (file) 54 KB Dronkers J Breakwater with crown element. 1
20:37, 19 March 2020 RearSideFailure.jpg (file) 134 KB Dronkers J Erosion of the rear side of the breakwater due to overtopping waves. 1
20:36, 19 March 2020 OffshoreBreakwaterShoreRevetment.jpg (file) 135 KB Dronkers J Left panel: Offshore rubble-mound breakwater. Right panel: Rubble-mound revetment protecting the backshore. 1
13:49, 29 February 2020 Figure6 3 COLOR.png (file) 493 KB Dronkers J Global map of the amplitude of quarterdiurnal tide M4. 1
13:46, 29 February 2020 Figure5 2 COLOR.png (file) 491 KB Dronkers J Global map of the luni-solar declinational diurnal component K1. 1
13:44, 29 February 2020 Figure5 1 COLOR.png (file) 608 KB Dronkers J Global map of the principal lunar semidiurnal component. 1
13:44, 29 February 2020 Figure1 3 COLOR.png (file) 93 KB Dronkers J Global distribution of the tidal range. 1
13:43, 29 February 2020 Figure1 2 COLOR.png (file) 105 KB Dronkers J Global distribution of semidiurnal, diurnal and mixed tides. 1
14:43, 22 February 2020 DamBreakFlowDerivation.jpg (file) 311 KB Dronkers J Derivation of the solution for frictionless dam break flow. 1
14:40, 22 February 2020 Dijkdoorbraak1953.jpg (file) 314 KB Dronkers J Sea dikes protecting low-lying polders in the Netherlands were breached during the extreme storm surge of 31 January 1953. 1
17:46, 21 February 2020 AccraCloggedDrainageCanals.jpg (file) 167 KB Dronkers J Clogged drainage canals in Accra (Ghana). Photo credit TU Delft. 1
12:40, 19 February 2020 FreshMakerSystem.jpg (file) 55 KB Dronkers J Creation of a fresh water lens by fresh water infiltration after artificial lowering of the salt water interface. 1
12:39, 19 February 2020 PaleochannelInfiltration.jpg (file) 43 KB Dronkers J Schematic representation of the underground fresh water reservoir created by fresh water infiltration in a sandy paleochannel deposit protruding above the mean land level. 1
12:38, 19 February 2020 HydraulicBarrier.jpg (file) 103 KB Dronkers J Schematic representation of a hydraulic barrier at the seaward entrance of an aquifer. 1
12:37, 19 February 2020 SeepageMechanisms.jpg (file) 183 KB Dronkers J Illustration of different seepage processes. 1
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