Report: ‘Ems estuary area: Schill Investigations – Preliminary Report (1951)»
Description
The investigations carried out in 1949 in the area around Norderney have shown that it is possible to indirectly draw clear conclusions about the sediment transport (sand migration) by tracking the drifting paths of the empty shell shells. For this purpose, however, a network of stations that was as dense as possible, from which samples are taken using ground grabs, seemed indispensable. It was still unknown whether this method could be used in general. [...] These questions necessary to ensure the method were resolved in September 1951 in the Emsmündungsgebiet. The inspection initiated by the Emden Water and Shipping Office was carried out in two voyages [...]. The soil samples were taken with a soil gripper according to VAN VEEN. [...] Mapping work in the western Juister Watt (see Ber. d. Research Centre 1950) showed that the large-scale wadden areas cannot be accorded a similar behavior everywhere. Reaction units are the sub-areas according to the hydrological factors acting at sea. It will therefore not be necessary to ask how the Juister Watt behaves or behaves, but only how it behaves or behaves, for example, the Nordland or the Hamburg sand. In comparison between Juister and Norderneyer Watt, the last in its entirety is subject to minor surface changes. This is the only general finding. In addition, the sub-areas must be dealt with in each case. Already in the research report for 1950, the limits of the possibilities of biological watt mapping were pointed out. Probably in many cases, with sufficient certainty, something can be said about the nature and direction of a superficial soil change within a small area, on the other hand, in the rarest cases something about the time or the speeds at which the said change took place or still takes place. However, this is not yet a lack of the method itself, as such time-quantitative information will be possible if repeated mappings of smaller and easily limitable habitats are carried out during certain periods of time. In another point, the possibilities of statements will be increased. There is no doubt that the individual of the different watt-life communities are correlated with those soil physical and soil chemical properties which vary to some extent but can be distinguished from other habitats. If the chemical-physical works associated with general terrain mapping have been completed since 1950, it will be possible to combine the physical and chemical properties of the soil, which are of interest in hydraulic engineering, at the same time with the easily and quickly comprehensible biocönotic term (e.g. Mya-Watt). This would have in principle achieved what the plant sociological vegetation mapping has been successful for a long time and made this method an often very useful, often not too immediate, but in any case time-saving aid for the practitioner.
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Tags
- emsmündung
- verdriftung-schill-nlwkn-bodengreiferproben-muschelschalen-muschel