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 - BOOK A1 - Knödel, Klaus A1 - Lange, Gerhard A1 - Voigt, Hans-Jürgen A1 - Bohn, Antje A1 - Jenn, Florian A1 - Liese, Manja A1 - Nagare, Ranjeet A1 - Nitsche, Claus A1 - Petzold, Hellfried A1 - Radschinski, Jens T1 - Environmental Geology - Handbook of Field Methods and Case Studies N2 - This handbook describes a broad spectrum of methods in the fields of remote sensing, geophysics, geology, hydrogeology, geochemistry, and microbiology designed to investigate landfill, mining and industrial sites. The descriptions provide information about the principle of the methods, applications and fundamentals. There is also coverage of the instruments, survey practice, processing and interpretation of the data, quality assurance, personnel, equipment, time needed, and examples, as well as references and sources for further reading.Furthermore, this handbook deals with the stepwise procedure for investigating sites and common problems faced in efficient implementation of field operations. It can be used as a practical guide for training students, as well as to illustrate the advantages of interdisciplinary site investigations to decision-makers faced with their own environmental investigations. KW - environmental geology KW - geochemistry KW - geophysics KW - remote sensing KW - site investigation Y1 - 2007 SN - 978-3-540-74669-0 PB - Springer CY - Berlin [u.a.] ER -