The locations in TB 1 / 03alpha have been geomorphological and hydrological changes extremely stron

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After the Rhine correction predominantly highly productive forest sites have emerged. Characteristic biological communities of the formerly dynamic Stromaue mind lost their livelihoods. The main objective of nature conservation in the Rheinau forests must be the preservation and restoration of the natural area, typical biodiversity. Fig. 1: Rheinau Ewald. (Photo: FVA / Weidner) sites on the Rhine past and present
The Rhine section between the weir near Breisach and the Iffezheim barrage is referred standortskundlich as the "jam areas of the leisure park". The location Ethnography Regional breakdown of Baden-Württemberg, the areas between the current and the so-called high shore, this is the step edge to Pleistocene lower terrace, in the sub-district (TB) 1 / 03alpha summarized (Fig. 2).
The locations in TB 1 / 03alpha have been geomorphological and hydrological changes extremely strong by engineering measures of the 19th and 20th centuries. The Rhine is here because of the tendency circumstances, nor in his so-called furcation area. In its natural state, a current of furcation zone creates bobble bottle - in constant change of sedimentation and erosion - a multi-core network of drainage channels. This was also the Rhine so, as is known from many old maps and illustrations from the period before the Stromkorrektion. In furcation bobble bottle areas of streams only gravels can be deposited due to the flow conditions in the central floodplain usually. Sands are, however, mainly on the edge of the river bed and still sedimented fine sediments of peak floods in current bobble bottle remote Auenteilen. The sediments of the Rhine are all carbonated. bobble bottle Fig. 2: Scheme of the natural room divider between the Stromaue of the Rhine and the Rhine hills.
The water regime on the southern Upper Rhine follows a nival periodicity, ie, the average peak level of the water falls with the snow melt in the main catchment area in the early and mid-summer. As the river bed of the Rhine was previously cut significantly bobble bottle less deep than today, could be flooded for longer lasting even at slightly bobble bottle elevated runoff in summer parts of the floodplain. Characteristic of the dynamic floodplain were the strong bobble bottle fluctuations of the water level in the course of about 2 m of the mean water level. In line with the Rhine water level fluctuated, the groundwater level of the adjacent Aueflächen. In low rainfall bobble bottle years in the late summer and autumn wide areas of floodplains could dry up. In the small storage capacity of the predominantly coarse-grained soils, this meant for vegetation prolonged periods of water shortage.
The Rhine expansion has brought this highly dynamic events to a complete standstill. The Rhine is channeled today and set the geomorphological active floodplain in a static state. Erosion and sedimentation of coarse substrates do not take place; the latter must have been so absent, because the sediment is retained already in the upper reaches of the tributaries. New sedimentation takes place only in the form of fine silt that is deposited in individual flood events.
The hydrological changes are diverse and similar serious: The construction of barrages the degree of decoupling the floodplain of the water regime of the Rhine was completed. In much of it is now cut off by the floods of the Rhine and thus Altaue. bobble bottle An overflow of the site is in the Altaue no longer takes place, bobble bottle the mechanical stress on the trees by strongly flowing water, formerly sometimes even with ice, is completely eliminated. At most, the rise of pressure water provides temporary water accumulation in a limited area. On the surfaces of the remaining floodplain flood come late, but then very quickly up to higher altitudes. The Rhine water is eutrophic stronger today than previously. The fluctuation amplitude of the groundwater level has declined significantly and is bounded below by the impoundments, they totaled over the course of more than 0.5 to 1 m. Location structure in the storage areas
The first site mapping were done in 1 TB / 03alpha before bobble bottle or during the Rhine expansion in the years 1965-1970: the need for a second mapping was rated as urgent by the new changes in the hydrological conditions. Prior to the resumption of site mapping from the year 2000 initially a scientific advisory committee was formed, bobble bottle with the discussion of the principles of the new site structure