@article{SchreiberMunzSalzmannetal.2021, author = {Schreiber, Lisa and Munz, Matthias and Salzmann, Thomas and Oswald, Sascha E.}, title = {Coupled simulation of groundwater and drainage dynamics in a coastal fen}, series = {Grundwasser : Zeitschrift der Fachsektion Hydrogeologie in der Deutschen Gesellschaft f{\"u}r Geowissenschaften (FH-DGG)}, volume = {26}, journal = {Grundwasser : Zeitschrift der Fachsektion Hydrogeologie in der Deutschen Gesellschaft f{\"u}r Geowissenschaften (FH-DGG)}, number = {3}, publisher = {Springer}, address = {Heidelberg}, issn = {1430-483X}, doi = {10.1007/s00767-021-00486-y}, pages = {289 -- 304}, year = {2021}, abstract = {Coastal wetlands are characterized by continued human influence, e.g. with drainage ditches, coastal dikes or landscape restoration. In addition, it is important to understand the complex interactions with the sea to predict impacts of further development. In the present study the aim was to analyze surface and subsurface flow in a coastal wetland located at the Baltic Sea coastline near Warnemunde (Germany) to quantify water exchange with the Baltic Sea and analyze the effect of a storm flood event on saline intrusion. A 3-D transient groundwater model and a one-dimensional surface water model were set up and calibrated by using hydraulic head measurements. The results indicate that in addition to ditch flow, groundwater discharge to the Baltic Sea often has a significant influence on the overall water budget of the fen. From the transient modelling it became evident that water exchange between groundwater in the fen and the Baltic Sea depends on sea level and very often fluctuates between seaward and landward flow directions on daily to weekly time scales.}, language = {de} } @article{MiegelGraeffFrancketal.2017, author = {Miegel, Konrad and Gr{\"a}ff, Thomas and Franck, Christian and Salzmann, Thomas and Bronstert, Axel and Walther, Marc and Oswald, Sascha Eric}, title = {Auswirkungen des Sturmhochwassers der Ostsee am 4./5. Januar 2017 auf das renaturierte Nieder- moor „H{\"u}telmoor und Heiligensee" an der deut- schen Ostseek{\"u}ste}, series = {Hydrologie und Wasserbewirtschaftung}, volume = {61}, journal = {Hydrologie und Wasserbewirtschaftung}, number = {4}, publisher = {Bundesanst. f{\"u}r Gew{\"a}sserkunde}, address = {Koblenz}, issn = {1439-1783}, doi = {10.5675/HyWa_2017,4_2}, pages = {232 -- 243}, year = {2017}, abstract = {Entlang der K{\"u}stenniederung des Naturschutzgebietes „H{\"u}telmoor und Heiligensee", ca. 6 km nord{\"o}stlich von Rostock-Warnem{\"u}nde gelegen, wird seit dem Jahr 2000 die K{\"u}stend{\"u}ne nicht mehr instand gehalten. Im Rahmen der Renaturierung des Gebietes werden so grunds{\"a}tzlich wieder {\"U}berflutungen bei Ostseehochwassern zugelassen, was bisher jedoch noch nicht eingetreten ist. Am 4./5. Januar 2017 ereignete sich ein Sturmhochwasser der Ostsee, mit einem Scheitelwasserstand in Warnem{\"u}nde, der sich zwischen dem 10- und 20-j{\"a}hrlichen Hochwasserstand einordnet. Dennoch kam es bei diesem Ereignis nicht zum D{\"u}nendurchbruch und zur seeseitigen {\"U}berflutung, wohl aber zum binnenseitigen Einstrom von Salz- bzw. Brackwasser. Dieser erfolgte {\"u}ber den Graben, durch den das Gebiet normalerweise {\"u}ber die Warnow in die Ostsee entw{\"a}ssert. Durch das Einstr{\"o}men {\"u}ber die Sohlschwelle, sonst Auslass des Gebietes, stiegen die Wasserst{\"a}nde und Salzkonzentrationen in der s{\"u}dwestlichen H{\"a}lfte der Niederung an. Mit zunehmender Entfernung zur Sohlschwelle waren diese Auswirkungen jedoch geringer sp{\"u}rbar. Dies gilt wegen der Retentionswirkung der Niederung mehr f{\"u}r den Wasserstand als f{\"u}r die Salzkonzentration. W{\"a}hrend der Wasserstand durch den Einstau der Niederung und {\"U}berschwemmungen fl{\"a}chenhaft anstieg, breitete sich die Salzfront pr{\"a}ferentiell in den ehemaligen Entw{\"a}sserungsgr{\"a}ben, die trotz des Einstaus nach wie vor hydraulisch aktiv sind, eher linienhaft aus. Diese Interpretation beruht auf Messergebnissen von Wasserstand, elektrischer Leitf{\"a}higkeit und Wassertemperatur.}, language = {de} } @article{SelleGraeffSalzmannetal.2016, author = {Selle, Benny and Graeff, Thomas and Salzmann, Thomas and Oswald, Sascha Eric and Walther, Marc and Miegel, Konrad}, title = {Investigation of a renatured fen catchment on the Baltic Sea coast of Mecklenburg - Part II: Salt dynamics and water balance}, series = {Hydrologie und Wasserbewirtschaftung}, volume = {60}, journal = {Hydrologie und Wasserbewirtschaftung}, publisher = {Bundesanst. f{\~A}¼r Gew{\~A}\isserkunde}, address = {Koblenz}, issn = {1439-1783}, doi = {10.5675/HyWa_2016.4_2}, pages = {259 -- 268}, year = {2016}, abstract = {Coastal fens like the nature reserve "Hutelmoor und Heiligensee" (north-eastern Germany) are important landscape elements along the southern Baltic coast, which exchange fresh water and brackish water with the Baltic Sea. These exchange processes can be understood as experiments with a natural tracer, which may be used to investigate the hydrologic behaviour of these fen systems. With the establishment of coastal protection measures such as dunes and dikes, the installation of surface drainage and, more recently, also nature conservation measures, the hydrologic regime of these coastal wetlands has constantly altered over the last centuries.The rehabilitated wetland "Hutelnnoor und Heiligensee" is suitable for an analysis of hydrologic change as it has been monitored over the time period since nature conservation measures started in the 1990s. Collected data sets included observation of groundwater levels and electrical conductivities, weather data as well as discharge at the outlet of the drainage catchment. In this article, as a second part of the dual publication, processes and quantified process magnitudes have been identified that govern the salt balance of the study area including its variability in space and time. It was detected that - over the period of rehabilitation - salt water entered the catchment with an episodic storm surge by wave overtopping of dunes in 1995. The intruded brackish water was then diluted, which was a slow process extending over decades. It was governed by local groundwater recharge from precipitation and the inflow of relatively fresh groundwater from the hinterland. It is concluded that salt inputs from the Baltic Sea provide a natural tracer of hydrological processes, which can be readily monitored via electrical conductivity measurements.}, language = {de} } @article{MiegelGraeffSelleetal.2016, author = {Miegel, Konrad and Graeff, Thomas and Selle, Benny and Salzmann, Thomas and Franck, Christian and Bronstert, Axel}, title = {Investigation of a renatured fen on the Baltic Sea coast of Mecklenburg - Part I: System description and basic hydrological characterisation}, series = {Hydrologie und Wasserbewirtschaftung}, volume = {60}, journal = {Hydrologie und Wasserbewirtschaftung}, publisher = {Bundesanst. f{\~A}¼r Gew{\~A}\isserkunde}, address = {Koblenz}, issn = {1439-1783}, doi = {10.5675/HyWa_2016.4_1}, pages = {242 -- 258}, year = {2016}, language = {de} }