Nature-Based Remediation: Growing Opportunities in the Harnessing of Natural Systems     

John Horst  Sara Drane  Jessica Gattenby 《Ground Water Monitoring & Remediation》2020,40(1):14-23

  相似文献   

Digital Innovation: The Next Disruptive but Transformative Remediation Frontier          下载免费PDF全文

John Horst  Nicklaus Welty  Matthew Schnobrich  Prasoon Sinha  Poonam R. Kulkarni 《Ground Water Monitoring & Remediation》2017,37(3):19-27

  相似文献   

Architecture of tunnel valleys in the southeastern North Sea: new insights from high-resolution seismic imaging     

Arne Lohrberg  Klaus Schwarzer  Daniel Unverricht  Andreas Omlin  Sebastian Krastel 《第四纪科学杂志》2020,35(7):892-906

Tunnel valleys are assumed to form near the margin of ice sheets. Hence, they can be used to reconstruct the dynamics of former ice margins. The detailed formation and infill of tunnel valleys, however, are still not well understood. Here, we present a dense grid of high-resolution 2D multi-channel reflection seismic data from the German sector of the southeastern North Sea imaging tunnel valleys in very great detail. Three tunnel valley systems were traced over distances ranging between 11 and 21 km. All tunnel valleys are completely filled and buried. They differ in incision depth, incision width and number of incisions. The tunnel valleys cut 130–380 m deep into Neogene, Palaeogene and Cretaceous sediments; they show a lower V-shaped and an upper U-shaped morphology. For individual tunnel valleys, the overall incision direction ranges from east–west to northeast–southwest. Two tunnel valleys intersect at an oblique angle without reuse of the thalweg. These valleys incise into a pre-existing glaciotectonic complex consisting of thrust sheets in the northwest of the study area. The analysis of the glaciotectonic complex and the tunnel valleys leads us to assume that we identified several marginal positions of (pre-)Elsterian ice lobes in the southeastern North Sea.  相似文献   

The Catalogue of the Vogtland/Western Bohemia Earthquakes and Vocatus as an Auxiliary Code     

Neunhöfer  Horst 《Studia Geophysica et Geodaetica》2000,44(4):549-555

The catalogue of earthquakes from the Vogtland/Western Bohemia region joins data which have been observed with local seismic stations since 1962. Up to now, data on more than 17.000 earthquakes were compiled to the catalogue. A special code VOCATUS supports its use and explains the collected data. Both, catalogue and code VOCATUS are described. From the catalogue, there follows a recurrence of the earthquake occurrence which is discussed in detail.  相似文献   

Dust tail streamers of a comet with rotating nucleus     

Klaus Beisser  Horst Drechsel 《Astrophysics and Space Science》1992,191(1):1-22

Synthetic images of the dust tail are presented for a comet which has a rotating nucleus with one predominant dust source fixed to it. The images have been generated using a new computer model which, unlike similar models, allows for the study of dust tails caused by a rotating nucleus with an anisotropic distribution of sources.The dust tail is studied in the post-perihelion phase of a parabolic comet with a perihelion distance of 0.5 AU. One finds that in the case of a rotating nucleus with anisotropic emission characteristics streamers caused solely by the dynamics of the dust particles are forming in the dust tail even if there is no dependence between the solar irradiation angle of the source and the amount of dust emitted. If the dust emission depends on the solar irradiation angle of the dust source, then the brightest tail regions do not necessarily coincide with the synchrones for the times of maximum dust emission.As a consequence, a thorough analysis of streamer patterns in a cometary dust tail requires assumptions on the rotational state and the dust source distribution of the nucleus. Otherwise, it seems not possible to discern between streamers which are caused dynamically by nucleus rotation and others which reflect variations in the emission activity.  相似文献   

The influence of the anomalous cosmic-ray component on the dynamics of the solar wind     

Hans-Jörg Fahr  Horst Fichtner  Stanislaw Grzedzielski 《Solar physics》1992,137(2):355-383

It is well known that both the galactic and anomalous cosmic rays show positive intensity gradients in the outer heliosphere which are connected with corresponding pressure gradients. Due to an efficient dynamical coupling between the solar wind plasma and these highly energetic media by means of convected MHD turbulences, there exists a mutual interaction between these media. As one consequence of this scenario the enforced pressure gradients influence the distant solar wind expansion. Here we concentrate in our theoretical study on the interaction of the solar wind only with the anomalous cosmic-ray component. We use the standard two-fluid model in which the cosmic-ray fluid modifies the solar wind flow via the cosmic-ray pressure gradient. Then we derive numerical solutions in the following steps: first we calculate an aspherical pressure distribution for the anomalous cosmic rays, describing their diffusion in an unperturbed radial solar wind. Second, we then consider the perturbation of the solar wind flow due to these induced anomalous cosmic-ray pressure gradients. Within this context we especially take account of the action of a non-spherical geometry of the heliospheric shock which may lead to pronounced upwinddownwind asymmetries in the pressures and thereby in the resulting solar wind flows. As we can show in our model, which fits the available observational data, radial decelerations of the distant solar wind by between 5 to 11% are to be expected, however, the deviations of the bulk solar wind flow from the radialdirections are only slightly pronounced.  相似文献   

Sand beach energetics: An ecosystem approach towards a high energy interface     

A. McLachlan  T. Erasmus  A.H. Dye  T. Wooldridge  G. Van der Horst  G. Rossouw  T.A. Lasiak  L. McGwynne 《Estuarine, Coastal and Shelf Science》1981,13(1):11-25

  相似文献   

Inclined K–Ar illite age spectra in brittle fault gouges: effects of fault reactivation and wall‐rock contamination          下载免费PDF全文

Espen Torgersen  Giulio Viola  Horst Zwingmann  Iain H. C. Henderson 《地学学报》2015,27(2):106-113

K–Ar clay fraction ages of brittle faults often vary with grain size, decreasing in the finer size fractions, producing an inclined age–grain‐size spectrum. K–Ar ages and mineralogical characterization of gouges from two normal faults in the Kongsberg silver mines, southern Norway, suggest that inclined spectra derived from brittle fault rocks reflect the mixing of inherited components with authigenic mineral phases. The ages of the coarsest and finest fractions constrain faulting at c. 260–270 Ma and reactivation around 200–210 Ma, respectively. This study demonstrates how wall‐rock contamination influences the K–Ar age of the coarsest size fractions and that authigenic illite and K‐feldspar can crystallize synkinematically under equivalent conditions and thus yield the same K–Ar ages.  相似文献   

Evolution of the Parnaíba Delta (NE Brazil) during the late Holocene     

Agata Szczygielski  Karl Stattegger  Klaus Schwarzer  André Giskard Aquino da Silva  Helenice Vital  Juliane Koenig 《Geo-Marine Letters》2015,35(2):105-117

  相似文献   

Correction of a Non-orthogonal,Three-Component Sonic Anemometer for Flow Distortion by Transducer Shadowing   总被引：1，自引：1，他引：0  

T. W. Horst  S. R. Semmer  G. Maclean 《Boundary-Layer Meteorology》2015,155(3):371-395

  相似文献