Modellierung der Austauschprozesse zwischen Oberflächen- und Grundwasser in Flußauen

Montenegro, Héctor; Holfelder, T.; Wawra, B.

doi:10.1007/978-3-642-59744-2_9

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…Since 90% of the surface water inputs within that segment derive from the upstream section and from four major tributaries (Schwarze Elster, Mulde, Saale, and Havel) that can easily be quantified by direct sampling, this section is an appropriate site for large-scaled mass balances. Groundwater inflow is not expected to considerably bias the mass balance, because the groundwater residence time in the catchment is long (~30 years [24]) and the direct exchange between groundwater and river water occurs on a relatively small scale (e.g., during flood events, infiltrating river water needs 48 days to be relocated 8 m away from the main channel [25]).…”

Section: Study Sitementioning

confidence: 99%

A Mass Balance of Nitrogen in a Large Lowland River (Elbe, Germany)

Ritz

Fischer

2019

Water

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Nitrogen (N) delivered by rivers causes severe eutrophication in many coastal waters, and its turnover and retention are therefore of major interest. We set up a mass balance along a 582 km river section of a large, N-rich lowland river to quantify N retention along this river segment and to identify the underlying processes. Our assessments are based on four Lagrangian sampling campaigns performed between 2011 and 2013. Water quality data served as a basis for calculations of N retention, while chlorophyll-a and zooplankton counts were used to quantify the respective primary and secondary transformations of dissolved inorganic N into biomass. The mass balance revealed an average N retention of 17 mg N m−2 h−1 for both nitrate N (NO3–N) and total N (TN). Stoichiometric estimates of the assimilative N uptake revealed that, although NO3–N retention was associated with high phytoplankton assimilation, only a maximum of 53% of NO3–N retention could be attributed to net algal assimilation. The high TN retention rates in turn were most probably caused by a combination of seston deposition and denitrification. The studied river segment acts as a TN sink by retaining almost 30% of the TN inputs, which shows that large rivers can contribute considerably to N retention during downstream transport.

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Section: Study Sitementioning

confidence: 99%

A Mass Balance of Nitrogen in a Large Lowland River (Elbe, Germany)

Ritz

Fischer

2019

Water

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“…Water level fluctuations were calculated based on the relation of river level fluctuations and water level fluctuations within the floodplain (Montenegro & Holfelder 1999; Schwartz et al 2003). Weekly water level data from 11 ground water gauges (seven in front of the dyke and four behind it) from periods between 1989 and 2004 within the study area were transformed into continuous hydrographs.…”

Section: Methodsmentioning

confidence: 99%

Hydrological prerequisites for optimum habitats of riparian Salix communities - identifying suitable reforestation sites

Mosner

Schneider

Lehmann

et al. 2011

Applied Vegetation Science

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Question: What are the hydrological requirements for the successful reforestation of riparian Salix communities? Do differences in site conditions between various life stages of woody vegetation types need to be considered? Do interactions between hydrological factors influence distribution patterns? Location: Mid‐reaches of the Elbe River, Germany. Methods: Young and old life stages of two different riparian Salix communities were surveyed in 1067 plots of 400 m2 to determine hydrological growth conditions using habitat distribution models. Models were extrapolated in a Geographic Information System to quantify the extent of potential stands available for reforestation measures. Results: Average water level and water level fluctuations were related to different vegetation types as well as to the age classes of the vegetation types. Differences in hydrological niches of young and old vegetation of the two vegetation types (tree community versus shrub community) could be identified. Moreover, the shrub vegetation was influenced by the interaction of average water level and fluctuations. Comparison of the distribution of current vegetation and suitable habitat revealed that considerable areas of the floodplain were suitable for the reforestation of Salix woodland communities. Conclusions: Hydrological variables explain the distribution patterns of riparian Salix communities in the active floodplain when different life stages, vegetation types and interaction of variables are included in the analyses. This information can be used to recommend suitable sites for Salix plantings in riparian landscapes.

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“…Complex interactions between surface water and shallow groundwater are found in riparian wetlands and floodplains (Winter, 1999;Sophocleous, 2002;Krause et al, 2007;Montenegro et al, 1999;Burek, 2003;Leiner, 2003;Sommer, 2000). These areas are typical landscape features in the lowlands of N Germany.…”

Section: Introductionmentioning

confidence: 99%

Variability of water quality in a riparian wetland with interacting shallow groundwater and surface water

Schmalz

Springer

Fohrer

2009

Z. Pflanzenernähr. Bodenk.

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Lowland catchment hydrology is dominated by shallow groundwater with complex interactions between groundwater and surface water. In lowland catchments of N Germany, a high fraction of agricultural land is drained and therefore influenced by fast water transport to discharge systems with resulting alterations to water quality. The investigated catchment area "Kielstau" (approx. 50 km 2 ) in the N of Schleswig-Holstein serves as an example. Detailed investigations on the interactions between groundwater, river, and ditch-water quality were evaluated at a drained riparian wetland area (0.15 km 2 ) used as grassland in the central part of this catchment. The water quality in the drainage ditches showed variability dependent on their hydrological integration. At the far-from-river end, groundwater and ditch-water quality were in most parameters much more alike than at the close-to-river end. The composition of ditch water at the close-toriver end of the ditch was determined by transformation processes and dilution which took place along the ditch much more than exfiltration processes like those that were dominant at the farfrom-river end. In most cases, the mean NH 4 concentrations were higher in the groundwater than in the ditches, but the highest concentrations were found all along the time in the close-toriver sampling points and in the river. The highest NO À 3 concentration was observed in a ditch influenced by an adjacent arable field as well as in the river. The concentrations of phosphate and total P were lower in groundwater than in the ditch water.

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Modellierung der Austauschprozesse zwischen Oberflächen- und Grundwasser in Flußauen

Cited by 4 publications

References 2 publications

A Mass Balance of Nitrogen in a Large Lowland River (Elbe, Germany)

A Mass Balance of Nitrogen in a Large Lowland River (Elbe, Germany)

Hydrological prerequisites for optimum habitats of riparian Salix communities - identifying suitable reforestation sites

Variability of water quality in a riparian wetland with interacting shallow groundwater and surface water

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