TY - CHAP A1 - He, Qianwen A1 - Molkenthin, Frank A1 - Wendland, Frank A1 - Herrmann, Frank T1 - Evaluation of different interpolation schemes for precipitation and reference evapotranspiration and the impact on simulated large-scale water balance in Slovenia T2 - European Geosciences Union, General Assembly 2016, Vienna, Austria N2 - Precipitation and reference evapotranspiration (ET0) are two main climate input components for hydrological models, which are often recorded or calculated based on measuring stations. Interpolation schemes are implemented to regionalize data from measuring stations for distributed hydrological models. This study had been conducted for 5 months, with the aim of: (1) evaluating three interpolation schemes for precipitation and reference evapotranspiration (ET0); (2) assessing the impact of the interpolation schemes on actual evapotranspiration and total runoff simulated by a distributed large-scale water balance model - mGROWA. The study case was the Republic of Slovenia, including a high variability in topography and climatic conditions, with daily meteorological data measured in 20 stations for a period of 44 years. ET0 were computed by both FAO Penman-Monteith equation and Hargreaves equation. The former equation is recommended as the standard equation, while the ET0 calculated by the latter one for Slovenia had a certain deviation (+150 mm/a) from it. Ordinary Kriging, Regression Kriging and Linear Regression were selected to regionalize precipitation and ET0. Reliability of the three interpolation schemes had been assessed based on the residual obtained from cross-validation. Monthly regionalized precipitation and ET0 were subsequently used as climate input for mGROWA model simulation. Evaluation of the interpolation schemes showed that the application of Regression Kriging and Linear Regression led to an acceptable interpolation result for reference evapotranspiration, especially in case the FAO Penman-Monteith equation was used. On the other hand, Regression Kriging also provided a more convincing interpolated result for precipitation. Meanwhile, mGROWA simulation results were affected by climate input data sets generated by applying difference interpolation schemes. Therefore, it is essential to select an appropriate interpolation scheme, in order to generate a convincing climate input. Y1 - 2016 UR - http://meetingorganizer.copernicus.org/EGU2016/EGU2016-8570.pdf N1 - EGU2016-8570 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - GEN A1 - Herrmann, Frank A1 - Jahnke, Christoph A1 - Jenn, Florian A1 - Kunkel, Ralf A1 - Voigt, Hans-Jürgen A1 - Voigt, Jens A1 - Wendland, Frank T1 - Groundwater recharge rates for regional groundwater modelling: a case study using GROWA in the Lower Rhine lignite mining area, Germany N2 - Abstract: Groundwater recharge rates calculated with the GROWA model have been applied as the recharge boundary condition for the regional groundwater model Rurscholle. This model simulates groundwater dynamics in the Pleistocene aquifers of the Lower Rhine lignite mining area (Germany). GROWA uses an area-differentiated approach to calculate recharge rates depending on runoff-relevant site characteristics, which are represented by a set of baseflow indices. The regional accuracy of the coupled groundwater and GROWA models has been checked using groundwater hydrographs as validation criteria. The results suggest that the current (unadjusted) version of GROWA underestimates the regional groundwater recharge rate by 10-20 mm/yr. The comparative analysis identified areas where recharge calculations could be improved by adjusting the baseflow indices for areas where runoff is dominated by slope, low water-logging and a low degree of sealing. Using the adjusted set of baseflow indices, the mean groundwater recharge rate of the Rurscholle region was modelled as approx. 170 mm/yr. This study highlights the benefit of using a coupled approach and being able to independently calibrate and validate groundwater recharge boundary conditions in regional groundwater models. KW - GROWA KW - Groundwater recharge/water budget KW - Mining KW - Numerical modeling Y1 - 2009 ER - TY - GEN A1 - Wendland, Frank A1 - Berthold, Georg A1 - Fritsche, Johann-Gerhard A1 - Herrmann, Frank A1 - Kunkel, Ralf A1 - Voigt, Hans-Jürgen A1 - Vereecken, Harry T1 - A conceptual hydrogeological model for evaluating residence times in Hessen KW - Conceptual hydrogeological model KW - Residence times KW - EU-WFD KW - Large-scale model KW - Hessen Y1 - 2011 ER - TY - GEN A1 - He, Qianwen A1 - Wendland, Frank A1 - Molkenthin, Frank T1 - The analysis of nitrogen load and simulation uncertainty using SWAT in a catchment with paddy field in China T2 - Water Science & Technology Journal KW - critical source areas KW - hydrological model KW - nitrogen load KW - nitrogen source apportionment KW - SWAT KW - uncertainty analysis Y1 - 2019 U6 - https://doi.org/10.2166/wst.2019.326 SN - 0273-1223 SN - 1996-9732 VL - 80 IS - 4 SP - 806 EP - 816 ER - TY - GEN A1 - Herrmann, Frank A1 - Keuler, Klaus A1 - Wolters, Tim A1 - Bergmann, Sabine A1 - Eisele, Michael A1 - Wendland, Frank T1 - Mit der Modellkette RCP-GCM-RCM-mGROWA projizierte Grundwasserneubildung als Datenbasis für zukünftiges Grundwassermanagement in Nordrhein-Westfalen T2 - Grundwasser N2 - Mit einem Multi-Modell-Ensemble wurde analysiert, wie sich der Klimawandel auf den Grundwasserhaushalt in Nordrhein-Westfalen (NRW) auswirkt. Hierzu wurden Projektionen der zukünftigen Grundwasserneubildung für insgesamt 36 Mitglieder der Modellkette RCP-GCM-RCM-mGROWA, bestehend aus 3 RCP-Szenarien zukünftiger globaler Erwärmung, 6 globalen und 5 dynamischen regionalen Klimamodellen sowie dem Wasserhaushaltsmodell mGROWA, vorgenommen. Mit dem Ensemble wurden für die hydrogeologischen Großräume NRWs nur teilweise signifikante Änderungen der jährlichen Grundwasserneubildung in den Perioden 2011–2040, 2041–2070 und 2071–2100 projiziert. Ein Robustheitstest mit zwei Kriterien (Übereinstimmung und Signifikanz der Änderungssignale) liefert keine belastbare Begründung dafür, dass sich die Grundwasserneubildung bis 2100 systematisch und signifikant ändern wird. Aus statistischer Perspektive wird deshalb die Schlussfolgerung gezogen, dass in NRW langfristig eine Grundwasserneubildung erwartet werden kann, die sich nicht grundlegend vom Niveau der Periode 1971–2000 unterscheidet. Hydro-meteorologisch befindet sich NRW in einer Übergangszone, in der eine Zunahme der Winterniederschläge die Wirkung der Erwärmung auf die Grundwasserneubildung wahrscheinlich kompensiert. KW - Grundwasserneubildung KW - Nordrhein-Westfalen KW - mGROWA KW - Klimawandel KW - Multi-Modell-Ensemble KW - Robustheit KW - Groundwater recharge KW - North Rhine-Westphalia KW - Climate change impact KW - Multi-model ensemble KW - Robustness Y1 - 2021 U6 - https://doi.org/10.1007/s00767-020-00471-x SN - 1430-483X SN - 1432-1165 VL - 26 IS - 1 SP - 17 EP - 31 ER - TY - JOUR A1 - Kunkel, Ralf A1 - Wendland, Frank A1 - Hannappel, Stephan A1 - Voigt, Hans-Jürgen A1 - Wolter, R. T1 - The influence of diffuse pollution on groundwater content patterns for the groundwater bodies of Germany JF - Water Science and Technology N2 - Commissioned by Germany's Working Group of the Federal States on Water Problems (LAWA) the authors developed a procedure to define natural groundwater conditions from groundwater monitoring data. The distribution pattern of a specific groundwater parameter observed by a number of groundwater monitoring stations within a petrographically comparable groundwater typology is reproduced by two statistical distribution functions, representing the "natural" and "influenced" component. The range of natural groundwater concentrations is characterized by confidence intervals of the distribution function of the natural component. The applicability of the approach was established for 17 hydrochemical different groundwater typologies occurring throughout Germany. Based on groundwater monitoring data from ca. 26,000 groundwater-monitoring stations, 40 different hydrochemical parameters were evaluated for each groundwater typology. For all investigated parameters the range of natural groundwater concentrations has been identified. According to the requirements of the EC Water Framework Directive (article 17) (WFD) this study is a basis for the German position to propose criteria for assessing a reference state for a "good groundwater chemical status". KW - groundwater KW - diffuse pollution KW - Germany Y1 - 2007 SN - 0273-1223 SN - 1996-9732 VL - 55 IS - 3 SP - 97 EP - 105 ER - TY - GEN A1 - Ijioma, Uche Dickson A1 - Wendland, Frank A1 - Herd, Rainer T1 - Characterizing groundwater vulnerability in developing urban settings using DRASTIC-LuPa approach: A case study of Aba City, Nigeria T2 - Academic Journals, African Journal of Environmental Science and Technology N2 - The impact of certain unregulated land-use activities harms the quality of water resources and reduces the sufficiency of drinking water in many developing countries. This study aimed to capture the impact of such activities and evaluate the specific groundwater vulnerability using a modified DRASTIC approach. The DRASTIC-LuPa was proposed and implemented for Aba City, Nigeria by incorporating land-use and the impact of pumping layers to the “intrinsic” DRASTIC parameters. The results of the analysis revealed that the area classified as “low” was 15 and 79.1% as “medium” and 5.9% as “high” vulnerability classes for the DRASTIC. Whereas for the DRASTIC-LuPa model 3.2% for “low”, 54.3% for “medium”, 41.8% for “high” and 0.7% for “very high” were found. The transitions in the vulnerability classes of areas displaying “high” and “very high” found in the DRASTIC-LuPa model represent the impact of urban hotspots observed in the area. This result implies that groundwater protection measures should be implemented in the area designated with “low” and “medium” vulnerability classes and used for abstracting clean water for drinking purposes. The proposed model enhances the predictability and guarantees better transferability of the approach in urban settings with similar urban trends. KW - Drinking water KW - DRASTIC KW - groundwater KW - groundwater vulnerability assessment KW - Nigeria Y1 - 2021 U6 - https://doi.org/10.5897/AJEST2021.3068 SN - 1996-0786 VL - Vol. 15 IS - 12 SP - 540 EP - 559 ER - TY - GEN A1 - Wendland, David A1 - Cuevas, Karla A1 - Winnefeld, Frank A1 - Stephan, Dietmar T1 - Chemical, Mineralogical and Mechanical Characterization of Ancient Roman Concrete and Mortar: A Review T2 - International Journal of Architectural Heritage Y1 - 2023 U6 - https://doi.org/10.1080/15583058.2023.2256259 SN - 1558-3066 SP - 1 EP - 25 ER -