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The interpolation results allow advanced mapping and investigation of apparent spatial differences in Holocene aggradation in larger coastal sedimentary systems. Furthermore, they provide a means to generate first-order age information with centennial precision for 3D geological subsurface models of Holocene deltas and valley fills. As such, the interpolation is of use in studies into past and present land subsidence and into low land sedimentation. Improving age-depth models of fluvio-lacustrine deposits using sedimentary proxies for accumulation rates more.
Lacustrine fills, including those of oxbow lakes in river floodplains, often hold valuable sedimentary and biological proxy records of palaeo-environmental change.
Precise dating of accumulated sediments at levels throughout these records Precise dating of accumulated sediments at levels throughout these records is crucial for interpretation and correlation of proxy data existing within the fills. Typically, dates are gathered from multiple sampled levels and their results are combined in age-depth models to estimate the ages of events identified between the datings.
In this paper, a method of age-depth modelling is presented that varies the vertical accumulation rate of the lake fill based on continuous sedimentary data. In between Bayesian calibrated radiocarbon dates, this produces a modified non-linear age-depth relation based on sedimentology rather than linear or spline interpolation. The method is showcased on a core of an infilled palaeomeander at the floodplain edge of the river Rhine near Rheinberg Germany. Four radiocarbon dates provide direct dating control, mapping and dating in the wider surroundings provide additional control.
The laminated, organo-clastic facies of the oxbow fill contains a record of nearby fluvial-geomorphological activity, including meander reconfiguration events and passage of rare large floods, recognized as fluctuations in coarseness and amount of allochthonous clastic sediment input. Continuous along-core sampling and measurement of loss-on-ignition LOI provided a fast way of expressing the variation in clastic sedimentation influx from the nearby river versus autochthonous organic deposition derived from biogenic production in the lake itself.
This low-cost sedimentary proxy data feeds into the age-depth modelling. The sedimentology-modelled age-depth relation re produces the distinct lithological boundaries in the fill as marked changes in sedimentation rate. Especially the organo-clastic muddy facies subdivides in centennial intervals of relative faster and slower accumulation. Improving age-depth models of fluvio-lacustrine deposits using sedimentary proxies for accumulation rates. Quaternary Geochronology Publication Name: Near-field sea-level variability in northwest Europe and ice sheet stability during the last interglacial.
It is from the North Sea margin that the earliest evidence of a pre-modern human presence in northern Europe has been obtained; and the region was inhabited, and also served as a pathway for human migration, for many hundreds of thousands of years. The discoveries allow interregional comparison of delta habitation between the Middle Mesolithic offshore, at depth in the sea, Doggerland and Late Mesolithic onshore, Rhine-Meuse delta, at depth below urbanized coastal plain. Delta Encyclopedia of Geography entry more. This study demonstrates how two important avulsions in the downstream part of the Rhine-Meuse delta, The Netherlands, were stimulated by human activities in the first millennium CE, before historic embankment constrained the river courses. Floodbasin type lacustrine versus terrestrial wetland , size and openness, partly through effects on discharge dispersal, affect how strongly the floodbasin groundwater tables respond to avulsion-diverted discharge. These combined effects caused irreversible sea ingression over large areas that consequently became unsuitable for habitation for many centuries. Since the Faculties of Geosciences and Humanities at Utrecht University collaborate with the Cultural Heritage Agency of The Netherlands in studies on palaeolandscapes and past human-landscape interactions.
Relative sea level RSL observations from several far Relative sea level RSL observations from several far- and intermediate-field sites suggest abrupt fluctuations or jumps in RSL during the LIG highstand that require one or more episodes of ice-sheet collapse and regrowth. Such events should be manifest as unique sea-level fingerprints, recorded in far-, intermediate- and near-field sites depending on the source s of ice-mass change involved.
To date, though, no coherent evidence of such fluctuations has been reported from near-field RSL studies in northwest Europe. This is an important problem because RSL fluctuations during the LIG are portrayed as warning signs for how polar ice sheets may behave in a future, warmer than present, world. Here we review the evidence for RSL change during the LIG using stratigraphic data from the best resolved highstand records that exist in the near-field of northwest Europe, from a range of settings that include lagoonal, shallow marine, tidal flat, salt marsh and brackish-water fluviatile environments.
Consideration of previously published stratigraphic records from two sites in the Eemian coastal-marine embayment that existed in the central Netherlands, yields no clear indications for abrupt RSL change during the attainment of the near-field highstand. Nor do we find any such indications common to other records from countries bordering the North Sea, the Baltic Sea and the White Sea.
Two modelling experiments that explore the global signal of hypothetical sea-level oscillations caused by partial collapse and regrowth of either the Greenland or Antarctic LIG ice-sheet, show that the North Sea region is relatively insensitive to mass changes sourced from Greenland but should clearly register events with an Antarctic origin, especially those that occur late in the LIG. The lack of evidence for abrupt sea-level fluctuations at this time in northwest Europe concurs with a lack of clear near-field evidence for ice sheet collapse.
Quaternary Science Reviews Preservation of meandering river channels in uniformly aggrading channel belts more. Channel belt deposits from meandering river systems commonly display an internal architecture of stacked depositional features with scoured basal contacts due to channel and bedform migration across a range of scales. Recognition and correct interpretation of these bounding surfaces is essential to reconstruction of palaeochannel dimensions and to flow modelling for hydrocarbon exploration. It is therefore crucial to understand the suite of processes that form and transfer these surfaces into the fluvial sedimentary record.
Model results highlight the importance of spatial and temporal variations in channel depth and migration rate to the generation of channel and bar deposits. Addition of net uniform bed aggradation due to excess sediment input allows quantification of the preservation of meander morphology for a wide range of depositional conditions. The present authors found that the effect of vertical variation in scouring due to channel migration is generally orders of magnitude larger than the effect of bed aggradation.
This explains the limited impact bed aggradation has on preservation of meander morphology. Moreover, lateral differences in stratigraphy within the meander belt are much larger than the stratigraphic imprint of bed aggradation. Repeatedly produced alternations of point bar growth followed by cut-off result in a vertical trend in channel and scour feature stacking. Importantly, this vertical stacking trend differs laterally within the meander belt. In the centre of the meander belt, the high reworking intensity results in many bounding surfaces and disturbed deposits.
Closer to the margins, reworking is infrequent and thick deposits with a limited number of bounding surfaces are preserved. These marginal areas therefore have the highest preservation potential for complete channel deposits and are thus best suited for palaeochannel reconstruction. Multidisciplinary analysis including paleomagnetic, sedimentologic, sea-level change, luminescence dating and palynologic research was performed on a 25 m long orientated core taken at Rutten, close to Eemian key localities in the Multidisciplinary analysis including paleomagnetic, sedimentologic, sea-level change, luminescence dating and palynologic research was performed on a 25 m long orientated core taken at Rutten, close to Eemian key localities in the Netherlands.
The main goal of our research was to test a possible delayed onset of temperate conditions in this region compared to Southern Europe, occurring within the Last Interglacial. The sediments revealed the presence of the paleomagnetic Blake Event in ca. The position of the Blake Event in relation to the pollen stratigraphy concurs with the earlier studied Neumark Nord 2 site. The onset of the Eemian in north-western and central Europe ca.
http://travellux.kz/img/zecumedi/2008-sayt-rozi.php In addition, the Rutten data provide evidence for a relatively long duration of the Blake Event of at least 8 kyr. The late onset of the temperate conditions that define the base of the Eemian, imply that NW Europe with the Eemian type area is not the most suited region to define the beginning of the Last Interglacial and Late Pleistocene for global chronostratigraphic use. Stratigraphy , Paleomagnetism , Sea Level , and Sedimentary geology and stratigraphy. Lower Rhine historical flood magnitudes of the last years reproduced from grain-size measurements of flood deposits using End Member Modelling more.
The objective of this research was to unlock the potential of fluvial archives to create flood chronologies, based on grain-size characteristics of flood deposits located in two recently formed fluvio-lacustrine sequences. Grain-size data was compared with contemporaneous discharge measurements for the Lower Rhine, The Netherlands.
Grain-size descriptive parameters such as the 95th percentile and end-member modelling outcomes correlate well with discharge and turn out to be sensitive proxies for inferring flood magnitudes. Locally, geomorphological changes influence the relation between peak discharge magnitudes and flood bed coarseness, but these can be assessed, using continuous flood layer and background sedimentation measurements to standardize grain size descriptive parameters. Flood records distilled from sedimentary archives hold great potential for extending existing records of observed discharge and aid establishment of design discharge for flood protection measures and assessment of non-stationarity of the flooding regime due to climatic and anthropogenic forcing.
Published in Catena, Past hydrological extreme events in a changing climate more. Quaternary Sedimentology and Geomorphology and Palaeohydrology. Eds Handbook of Sea-Level Research. Palaeogeography , Sea Level , Holocene sea level change , and Paleogeography. By the time of the Early-Middle Holocene transition deltas and other coastal systems began stabilizing their By the time of the Early-Middle Holocene transition deltas and other coastal systems began stabilizing their positions — and these have since been maintained.
The last major accelerated sea level rise occurred between 8. This event left a marked transgressive impact on sedimentary sequences of river mouths around the world, exemplified in most excessive detail in the Rhine delta North Sea, The Netherlands , from boreholes and underground exposures in the city of Rotterdam and its mega-harbour.
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What ended as the 8. Rather than the temporary, globally highly variant, and sedimentary indirect and often insignificant registration of the climatic 8. Consequently, it left lithostratigraphical and environmental event-boundaries in coastal sequences around the world, in the zone where Holocene accumulations are thickest and functional subdivision is most important architecturally. This is reason to consider the sea-level signal of the 8.
Lissabon, Portugal More Info: Jul 4, Journal Name: May 1, Publication Name: Jul 5, Conference Start Date: A staged geogenetic approach to underwater archaeological prospection in the Port of Rotterdam Yangtzehaven, Maasvlakte, The Netherlands: A geological and palaeoenvironmental case study for local mapping of Mesolithic lowland landscapes more.
This study presents the geogenetic approach to detect presently drowned archaeological sites in the transgressive palaeoenvironment of the Holocene Rhine-Meuse delta. A staged and practical approach is advocated in which subsurface A staged and practical approach is advocated in which subsurface archaeological predictions are based on geological mapping and palaeoenvironmental reconstruction of the underwater location. The study area is located in the Maasvlakte harbour extension of the Port of Rotterdam, formerly a part of the southern North Sea.
This initial model is used to determine the strategy of the subsequent phases of investigation, such as whether to proceed with dredging as part of the engineering work, down to 17 m water depth, to remove the upper younger sands and thereby improve the opportunities for underwater survey of fluvio-deltaic layers of Mesolithic age. Following the development of the initial site model, a full-area investigation was carried out using geophysics and coring, the latter providing material for palaeoenvironmental analysis. This allowed the reconstruction of the long-drowned former landscape, which included inland dune areas and local drainage systems and provided the physiographic context for the geoprospection of Mesolithic archeology.
This predictive modeling identified two areas in the harbour for detailed investigation, again employing geophysics and coring at higher resolutions, allowing fine tuning of the palaeolandscape models at the localities of presumed highest archeological potential. Cores from one of the selected areas, an inland dune area within the Early Holocene wetland region, yielded in-situ evidence of Mesolithic occupation of this site in what is now the southern North Sea.
These finds and the palaeolandscape context created with the data from the prospection phases were critical in the decision to undertake an underwater archaeological excavation using a large, boat-mounted grab sampling system. This paper provides an account of the geological and palaeoenvironmental work undertaken in the prospective phases leading up to the discovery of the site, highlighting the importance of the staged geogenetic approach for informing sampling strategies and securing high-quality information on landscape contexts, which in turn, informed archaeological decision-making and geoprospection strategies.
Such an approach has wider generic application for palaeolandscape reconstruction and mapping at regional scales. Quaternary International , Publication Date: Introduction to North Sea submerged landscapes and prehistory more. Cohen Introduction to North Sea submerged landscapes and prehistory. Netherlands Journal of Geosciences I present and frame my preferred meaning for it, and my preferred slotting: It covers the time when observant scientists were around and from which we have more than geology alone to base earth scientific records on the age of measurement.
This happens to coincide with humans becoming a geological factor, mostly because mankind discovered what it could do with geology: It also is a quick way out. It is an escape from potentially endless academic chronostratigraphical definition discussions and quests for golden spikes to pin in a boundary that is gradual in space and time, also because it sits in overly complete and too-high resolution very youngest geological record.
I advocate to just be frank on the arbitrary nature of defining an exact beginning in this chronostratigraphical matter, by choosing it so that it suits geologists, and not nature or history best. After all, we do stratigraphical bookkeeping for humans who live on and study and document our changing earth — not to make earth change itself.
Rocha, Pais, Kullberg, Finney eds.