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  • 1
    Online Resource
    Online Resource
    Dendro-provenancing of Arctic driftwood
    Elsevier BV ; 2017
    In:  Quaternary Science Reviews Vol. 162 ( 2017-04), p. 1-11
    Details
    In: Quaternary Science Reviews, Elsevier BV, Vol. 162 ( 2017-04), p. 1-11
    Type of Medium: Online Resource
    ISSN: 0277-3791
    URL: Article
    DOI: 10.1016/j.quascirev.2017.02.025
    RVK:
    RA 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2017
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  • 2
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    Method developments for accelerator mass spectrometry at CologneAMS, 53Mn/3He burial dating and ultra-small 14CO2 samples
    Elsevier BV ; 2020
    In:  Global and Planetary Change Vol. 184 ( 2020-01), p. 103053-
    Details
    In: Global and Planetary Change, Elsevier BV, Vol. 184 ( 2020-01), p. 103053-
    Type of Medium: Online Resource
    ISSN: 0921-8181
    URL: Article
    DOI: 10.1016/j.gloplacha.2019.103053
    RVK:
    RA 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2020
    detail.hit.zdb_id: 20361-0
    detail.hit.zdb_id: 2016967-X
    SSG: 13
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  • 3
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    Flow patterns, sedimentation and deposit architecture under a hydraulic jump on a non‐eroding bed: defining hydraulic‐jump unit bars
    Wiley ; 2009
    In:  Sedimentology Vol. 56, No. 5 ( 2009-08), p. 1346-1367
    Details
    In: Sedimentology, Wiley, Vol. 56, No. 5 ( 2009-08), p. 1346-1367
    Abstract: This paper presents results from two flume runs of an ongoing series examining flow structure, sediment transport and deposition in hydraulic jumps. It concludes in the presentation of a model for the development of sedimentary architecture, considered characteristic of a hydraulic jump over a non‐eroding bed. In Run 1, a hydraulic jump was formed in sediment‐free water over the solid plane sloping flume floor. Ultrasonic Doppler velocity profilers recorded the flow structure within the hydraulic jump in fine detail. Run 2 had identical initial flow conditions and a near‐steady addition of sand, which formed beds with two distinct characteristics: a laterally extensive, basal, wedge‐shaped massive sand bed overlain by cross‐laminated sand beds. Each cross‐laminated bed recorded the initiation and growth of a single surface feature, here defined as a hydraulic‐jump unit bar . A small massive sand mound formed on the flume floor and grew upstream and downstream without migrating to form a unit bar. In the upstream portion of the unit bar, sand finer than the bulk load formed a set of laminae dipping upstream. This set passed downstream through the small volume of massive sand into a foreset, which was initially relatively coarse‐grained and became finer‐grained downstream. This downstream‐fining coincided with cessation of the growth of the upstream‐dipping cross‐set. At intervals, a new bed feature developed above and upstream of the preceding hydraulic‐jump unit bar and grew in the same way, with the foreset climbing the older unit bar. The composite architecture of the superimposed unit bars formed a fanning, climbing coset above the massive wedge, defined as one unit: a hydraulic‐jump bar complex .
    Type of Medium: Online Resource
    ISSN: 0037-0746 , 1365-3091
    URL: Issue
    URL: Article
    DOI: 10.1111/sed.2009.56.issue-5
    DOI: 10.1111/j.1365-3091.2008.01037.x
    RVK:
    RB 10121
    Language: English
    Publisher: Wiley
    Publication Date: 2009
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    detail.hit.zdb_id: 206889-8
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  • 4
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    Quantifying velocity and turbulence structure in depositing sustained turbidity currents across breaks in slope
    Wiley ; 2005
    In:  Sedimentology Vol. 52, No. 3 ( 2005-06), p. 467-488
    Details
    In: Sedimentology, Wiley, Vol. 52, No. 3 ( 2005-06), p. 467-488
    Abstract: Two‐dimensional experiments investigating sediment transport and turbulence structure in sustained turbidity currents that cross breaks in slope are presented as analogue illustrations for natural flows. The results suggest that in natural flows, turbulence generation at slope breaks may account for increased sand transport into basins and that the formation of a hydraulic jump may not be necessary to explain features such as the occurrence of submarine plunge pools and the deposition of coarser‐grained beds in the bottomsets of Gilbert‐type fan deltas. Experimental flows were generated on 0°, 3°, 6° and 9° slopes of equal length which terminated abruptly on a horizontal bed. Two‐component velocities were measured on the slope, at the slope break and downstream of the slope break. Flows were depositional and non‐uniform, visibly slowing and thickening with distance downstream. One‐dimensional continuous wavelet transforms of velocity time series were used to produce time‐period variance maps. Peaks in variance were tested against a background red‐noise spectrum at the 95% level; a significant period banding occurs in the cross‐wavelet transform at the slope break, attributed to increased formation of coherent flow structures (Kelvin–Helmholtz billows). Variance becomes distributed at progressively longer periods and the shape of the bed‐normal‐velocity spectral energy distribution changes with distance downstream. This is attributed to a shift towards larger turbulent structures caused by wake stretching. Mean velocity, Reynolds shear stress and turbulent kinetic energy profiles illustrate the mean distribution of turbulence through the currents. A turbulent kinetic energy transfer balance shows that flow non‐uniformity arises through the transfer of mean streamwise slowing to mean bed‐normal motion through the action of Reynolds normal stresses. Net turbulence production through the action of normal stresses is achieved on steeper slopes as turbulence dissipation due to mean bed‐normal motion is limited. At the slope break, an imbalance between the production and dissipation of turbulence occurs because of the contrasting nature of the wall and free‐shear boundaries at the bottom and top of the flows, respectively. A rapid reduction in mean streamwise velocity predominately affects the base of the flows and steeper proximal slope flows have to slow more at the break in slope. The increased turbulent kinetic energy, limited bed‐normal motion and strong mixing imposed by steep proximal slopes means rapid slowing enhances turbulence production at the break in slope by focusing energy into coherent flow structures at a characteristic period. Thus, mean streamwise slowing is transferred into turbulence production at the slope break that causes increased transport of sediment and a decrease in deposit mass downstream of the slope break. The internal effects of flow non‐uniformity therefore can be separated from the external influence of the slope break.
    Type of Medium: Online Resource
    ISSN: 0037-0746 , 1365-3091
    URL: Issue
    URL: Article
    DOI: 10.1111/sed.2005.52.issue-3
    DOI: 10.1111/j.1365-3091.2005.00705.x
    RVK:
    RB 10121
    Language: English
    Publisher: Wiley
    Publication Date: 2005
    detail.hit.zdb_id: 2020955-1
    detail.hit.zdb_id: 206889-8
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  • 5
    Online Resource
    Online Resource
    Variations in the architecture of hydraulic‐jump bar complexes on non‐eroding beds
    Wiley ; 2013
    In:  Sedimentology Vol. 60, No. 5 ( 2013-08), p. 1291-1312
    Details
    In: Sedimentology, Wiley, Vol. 60, No. 5 ( 2013-08), p. 1291-1312
    Abstract: Sediment accumulation downstream of hydraulic jumps can occur in many settings but the architectures of such deposits are poorly documented. Here, three flume runs were used to examine the influence of sediment grain size and transport rate on the characteristics of hydraulic‐jump unit bars . In one of these runs six hydraulic‐jump unit bars formed a hydraulic‐jump bar complex . In another, the same sediment was supplied more quickly and only two unit bars formed. In the third run with the same sediment supply rate, but different grain size, only one large unit bar formed. All unit bars developed in a similar way but their size and internal architecture differed; they all resulted from a reduction in sediment transport capacity at the transition from supercritical flow to subcritical flow in the hydraulic jump. After initial onset of sedimentation and unit bar formation, generation of subsequent unit bars may be: (i) related to small changes in sediment flux; and (ii) independent of changes in the hydraulic jump. Continued sedimentation caused changes from oscillating to weak hydraulic jumps and hydraulic‐jump unit bars formed in both circumstances. The flow of water and suspended sediment becomes shallower over the lee of the bar complex. This leads to flow acceleration and a return to supercritical flow conditions. In turn, a chain of such features can form and generate a chute and pool bed morphology. There is an inherent upper size limit to a hydraulic‐jump bar complex due to the changing flow conditions over the growing deposit as the water above it becomes shallower. There is also an amplitude minimum for the development of foresets and subsequent unit bar growth. Hydraulic‐jump unit bars have architectures that should be recognizable in the rock record and because their size is constrained by the flow conditions, their identification should be useful for interpreting palaeoenvironment.
    Type of Medium: Online Resource
    ISSN: 0037-0746 , 1365-3091
    URL: Issue
    URL: Article
    DOI: 10.1111/sed.2013.60.issue-5
    DOI: 10.1111/sed.12035
    RVK:
    RB 10121
    Language: English
    Publisher: Wiley
    Publication Date: 2013
    detail.hit.zdb_id: 2020955-1
    detail.hit.zdb_id: 206889-8
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  • 6
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    Interpreting flash flood palaeoflow parameters from antidunes and gravel lenses: An example from Montserrat, West Indies
    Wiley ; 2017
    In:  Sedimentology Vol. 64, No. 7 ( 2017-12), p. 1817-1845
    Details
    In: Sedimentology, Wiley, Vol. 64, No. 7 ( 2017-12), p. 1817-1845
    Abstract: The wavelength of stationary water‐surface waves and their associated antidune bedforms are related to the mean velocity and depth of formative flow. In past published sand‐bed flume experiments, it was found that lens structures were preserved during antidune growth and change, and the dimension of the lenses was empirically related to antidune wavelength, and thus could be used to estimate flow velocity and depth. This study is the first to compare observations of formative flow conditions and resulting sedimentary structures in a natural setting, testing the previously published relationship at a field‐scale. Trains of stationary and upstream migrating water‐surface waves were prevalent during the flash flood in October 2012 in the Belham Valley, Montserrat, West Indies. Wave positions and wavelengths were assessed at 900 sec intervals through the daylight hours of the event within a monitored reach. The wave data indicate flow depths up to 1·3 m and velocity up to 3·6 m sec −1 . Sedimentary structures formed by antidune growth and change were preserved in the event deposit. These structures include lenses of clast‐supported gravel and massive sand, with varying internal architecture. The lenses and associated low‐angle strata are comparable to sand‐bed structures formed from stationary and upstream migrating waves in flume experiments, confirming the diagnostic value of these structures. Using mean lens length in the event deposit underestimated peak flow conditions during the flood and implied that the lenses were preserved during waning flow.
    Type of Medium: Online Resource
    ISSN: 0037-0746 , 1365-3091
    URL: Issue
    URL: Article
    DOI: 10.1111/sed.2017.64.issue-7
    DOI: 10.1111/sed.12375
    RVK:
    RB 10121
    Language: English
    Publisher: Wiley
    Publication Date: 2017
    detail.hit.zdb_id: 2020955-1
    detail.hit.zdb_id: 206889-8
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  • 7
    Online Resource
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    Moving boulders in flash floods and estimating flow conditions using boulders in ancient deposits
    Wiley ; 2016
    In:  Sedimentology Vol. 63, No. 6 ( 2016-10), p. 1582-1595
    Details
    In: Sedimentology, Wiley, Vol. 63, No. 6 ( 2016-10), p. 1582-1595
    Abstract: Boulders moving in flash floods cause considerable damage and casualties. More and bigger boulders move in flash floods than predicted from published theory. The interpretation of flow conditions from the size of large particles within flash flood deposits has, until now, generally assumed that the velocity (or discharge) is unchanging in time (i.e. flow is steady), or changes instantaneously between periods of constant conditions. Standard practice is to apply theories developed for steady flow conditions to flash floods, which are however inherently very unsteady flows. This is likely to lead to overestimates of peak flow velocity (or discharge). Flash floods are characterised by extremely rapid variations in flow that generate significant transient forces in addition to the mean‐flow drag. These transient forces, generated by rapid velocity changes, are generally ignored in published theories, but they are briefly so large that they could initiate the motion of boulders. This paper develops a theory for the initiation of boulder movement due to the additional impulsive force generated by unsteady flow, and discusses the implications.
    Type of Medium: Online Resource
    ISSN: 0037-0746 , 1365-3091
    URL: Issue
    URL: Article
    DOI: 10.1111/sed.2016.63.issue-6
    DOI: 10.1111/sed.12274
    RVK:
    RB 10121
    Language: English
    Publisher: Wiley
    Publication Date: 2016
    detail.hit.zdb_id: 2020955-1
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  • 8
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    Large‐scale structure of Calamus River deposits (Nebraska, USA) revealed using ground‐penetrating radar
    Wiley ; 1998
    In:  Sedimentology Vol. 45, No. 6 ( 1998-12), p. 977-986
    Details
    In: Sedimentology, Wiley, Vol. 45, No. 6 ( 1998-12), p. 977-986
    Abstract: The large‐scale (i.e. bar‐scale) structure of channel deposits of the braided, low‐sinuosity Calamus River, Nebraska, is described using ground‐penetrating radar (GPR) profiles combined with vibracores. Basal erosion surfaces are generally overlain by medium‐scale, trough‐cross‐stratified (sets 3–25 cm thick), very coarse to medium sands, that are associated with relatively high amplitude, discontinuous GPR reflectors. Overlying deposits are bioturbated, small‐scale cross‐stratified (sets 〈 3 cm thick) and vegetation‐rich, fine to very‐fine sands, that are associated with low‐amplitude discontinuous reflectors. Near‐surface peat and turf have no associated GPR reflectors. In along‐stream profiles through braid and point bars, most GPR reflectors dip downstream at up to 2° relative to the basal erosion surface, but some reflectors in the upstream parts of bars are parallel to the basal erosion surface or dip upstream. In cross‐stream profiles through bars, GPR reflectors are either approximately parallel to bar surfaces or have low‐angle inclinations (up to 6°) towards cut banks of adjacent curved channels. Basal erosion surfaces become deeper towards cut banks of curved channels. These structures can be explained by lateral and downstream growth of bars combined with vertical accretion. Convex upwards forms up to 0·5 m high, several metres across and tens of metres long represent episodic accretion of unit bars (scroll bars and bar heads). Stratal patterns in channel fills record a complicated history of erosion and deposition during filling, including migration of relatively small bars. A revised facies model for this type of sandy, braided river has been constructed based on this new information on large‐scale bedding structure.
    Type of Medium: Online Resource
    ISSN: 0037-0746 , 1365-3091
    URL: Article
    DOI: 10.1046/j.1365-3091.1998.00174.x
    RVK:
    RB 10121
    Language: English
    Publisher: Wiley
    Publication Date: 1998
    detail.hit.zdb_id: 2020955-1
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  • 9
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    The value of bioenergy in low stabilization scenarios: an assessment using REMIND-MAgPIE
    Springer Science and Business Media LLC ; 2014
    In:  Climatic Change Vol. 123, No. 3-4 ( 2014-4), p. 705-718
    Details
    In: Climatic Change, Springer Science and Business Media LLC, Vol. 123, No. 3-4 ( 2014-4), p. 705-718
    Type of Medium: Online Resource
    ISSN: 0165-0009 , 1573-1480
    URL: Article
    DOI: 10.1007/s10584-013-0940-z
    RVK:
    RA 1000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2014
    detail.hit.zdb_id: 751086-X
    detail.hit.zdb_id: 1477652-2
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  • 10
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    Comparability of heavy mineral data – The first interlaboratory round robin test
    Elsevier BV ; 2020
    In:  Earth-Science Reviews Vol. 211 ( 2020-12), p. 103210-
    Details
    In: Earth-Science Reviews, Elsevier BV, Vol. 211 ( 2020-12), p. 103210-
    Type of Medium: Online Resource
    ISSN: 0012-8252
    URL: Article
    DOI: 10.1016/j.earscirev.2020.103210
    RVK:
    RA 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2020
    detail.hit.zdb_id: 1792-9
    detail.hit.zdb_id: 2012642-6
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