Zur Petrologie und Metamorphose des Brennermesozoikums (Stubaier Alpen,Tirol)     

Dr. H. Dietrich 《Mineralogy and Petrology》1983,31(3-4):235-257

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Perception and evaluation of dead wood in streams and rivers by German students   总被引：1，自引：0，他引：1  

Michael Mutz  Herve Pigay  Kenneth J. Gregory  Dietrich Borchardt  Michael Reich  Klaus Schmieder 《Limnologica》2006,36(2):110-118

Dead wood is a significant element of natural streams and rivers in temperate climate zones. Established stream management removes wood, whereas some scientists recently promoted the reintroduction of wood in stream rehabilitation and restoration. It is desirable to know if wood in streams and rivers would be accepted. A survey was therefore conducted in order to assess the spontaneous visual perception of 10 stream and 10 river scenes with and without wood in terms of naturalness, risk, aesthetics and need for improvement using visual analog scales. Three hundred and sixty-five German students from five subjects related to water management and from one subject without any professional association to running waters were surveyed before their first contact to teaching of aquatic ecology. They clearly perceived wood in streams and rivers as natural. Scenes with wood were most frequently associated with danger for sport activities while scenes without wood were most frequently associated with danger by flooding. When comparing scenes with and without wood, scenes with wood were clearly considered more positive as significantly more aesthetic, less dangerous and needing less improvement. The disciplinary groups showed variations in the absolute evaluation scores but the relative evaluation of scenes with wood versus scenes without wood was similar among all groups. The results indicate an acceptance for the reintroduction of wood in stream rehabilitation and restoration by young students who are potential future players in water management.  相似文献   

Self-organization of recent rhythmic iron-manganese precipitations in underground mines in the Harz mountains     

S. Dietrich  K. -H. Jacob 《International Journal of Earth Sciences》1996,85(1):29-37

A recent early diagenetic banded iron-manganese mud has been forming underground in a closed lead-zinc mine for approximately 40 years. The processes leading to the banded structure of the precipitate were studied during a period of 2 years. Therefore, 19 physical and chemical parameters were measured regularly in short intervals. The resulting time series were analysed with respect to the data sets of the monthly chemical analyses of the descendent mine water, the daily rainfall and the mineral content. The results reveal that the precipitated material undergoes internal self-organization due to interaction of redox, colloid-chemical, microbial, electrical and ripening processes, and not exclusively produced by seasonal fluctuations of material input. Thus, the primary banding of the material, caused by externally forced fluctuations of the redox conditions within the mine water, is reorganized after a short time. The finally observed bands are controlled by non-linear coupling of reaction and transport processes within the mud. A genetic model for the banded mineralization was developed and verified by numerical simulation.  相似文献   

Begleitwort der Schriftleitung zu dieser Ausgabe     

Dietrich Voppel 《Ocean Dynamics》1988,41(2):91-91

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Book reviews     

Dietrich D. Klemm 《Mineralium Deposita》1986,21(4):337-339

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Die Alpiden und die Kimmeriden: Die verdoppelte Geschichte der Tethys — Discussion     

Prof. Dr. Dietrich Helmcke 《International Journal of Earth Sciences》1986,75(2):495-499

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Geothermal problems in mountain ranges (Alps)     

Dietrich Werner 《Tectonophysics》1985,121(1):97-108

An attempt has been made to model the temperature distribution taking into account simultaneously the effects of regional uplift and erosion, present topography, development of topography with time and paleoclimatic variations.Two time intervals were considered: a long period (30 m.y.) for the uplift history and a relatively short period (200,000 y) for the surface history (topography, climate).The calculations were based on finite differences in space and time. An example is presented for an area in the Swiss Alps, where observed rock temperatures in a tunnel and paleotemperature data are available. A simple uplift history can fit the paleotemperatures but leads to unrealistic high temperatures in greater depths. To improve the model frictional heat sources due to crustal overthrusting were introduced.  相似文献   

Das erdmagnetische Feld im Jahr 1983 nach Messungen des Erdmagnetischen Observatoriums Wingst     

Dietrich Voppel 《Ocean Dynamics》1984,37(1):29-32

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Solar limb darkening 1986–1990 (λλ303 to 1099 nm)     

Heinz Neckel  Dietrich Labs 《Solar physics》1994,153(1-2):91-114

The Sun's limb darkening was observed repeatedly between the 1986 minimum and the 1990 maximum of solar activity.Systematic variations, which could depend either on the momentary activity and/or the phase in the solar cycle, werenot detectable, either at continuum wavelengths or in two broad-band spectral intervals. Completelyirregular variations, which concern not only individual, successive scans (due to granulation, etc.), but also thedaily andseasonal averages, are usually less than 1%, but can reach occasionally 2% or even more. Minoreast-west asymmetries even in the seasonal means seem to be well established, mainly for < 400 nm. Thefinal, mean limb-darkening coefficients agree basically with those published by Pierce and Slaughter (1977) and Pierce, Slaughter, and Weinberger (1977), but show a much lower scatter when plotted against wavelength.  相似文献   

Towards an integration of process measurements, archive analysis and modelling in geomorphology — the Kärkevagge experimental site, Abisko area, northern Sweden     

Martin Gude  Gerhard Daut  Susanne Dietrich  Roland Mäusbacher  Christer Jonasson  Annett Bartsch  & Dieter Scherer 《Geografiska Annaler: Series A, Physical Geography》2002,84(3-4):205-212

The analysis of Holocene geomorphic process activity demands long–term data sets, which are available for the Kärkevagge catchment due to 50 years of intensive geomorphologic field studies. This data set is used in combination with additional field measurements, remote sensing and digital elevation model (DEM) analysis to provide input data for modelling Holocene valley development. On the basis of this information, geomorphic process units (GPUs) are defined by means of GIS modelling. These units represent areas of homogeneous process composition that transfer sediments. Since the data base enables the quantification of single processes, the interaction of processes within the units can also be quantified. Applying this concept permits calculation of recent sediment transfer rates and hence leads to a better understanding of actual geomorphic landscape development activity. To extrapolate these data in time and space the process–related sediments in the valley are analysed for depth and total volume, primarily using geophysical methods. In this fashion the validity of measured process rates is evaluated for the Holocene time scale. Results from this analysis are exemplified in a cross–profile showing some of the principal sediment units in the valley. For example, the measured modern rates on a slush torrent debris fan seem to represent the Holocene mean rate. This approach should also be suitable for revealing Holocene geomorphic landscape development in terms of climate change.  相似文献