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| Home > Publications database > MOSYRUR - Water balance analysis in the Rur basin |
| Book | PreJuSER-45087 |
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2005
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
ISBN: 3-89336-385-8
Please use a persistent id in citations: http://hdl.handle.net/2128/364
Abstract: In this report the current results of the research activities in the MOSYRUR project are summarized. The targets of the first project phase (2002-2004) were the analysis of the quantitative status of the water resources in the catchment of the Rur ($\sim$2350 km$^{2}$) and the indication of the water balance at different scales. Process orientated investigations and simulations were performed at the small meso-scale test area "Zwischenscholle" (20 km$^{2}$) using the TRACE model. For the model application the potential evapotranspiration was calculated, Pedotransfer functions were utilized in order to derive the soil hydraulic properties and borehole measurements of groundwater levels were spatially and temporally interpolated in order to define the vertical boundary conditions. A one-dimensional and a three-dimensional TRACE application were performed for the period 1.12.1983 to 31.11.1993. The one-dimensional TRACE application was validated using a lysimeter experiment dataset spanning the period from 25.11.1988 to 13.8.1990. The actual evapotranspiration is slightly underestimated, while the amount of drainage is slightly overestimated. Nevertheless the calculated model performance measures indicate that all relevant processes and state variables (evapotranspiration, drainage and soil moisture) are well described. The measured actual evapotranspiration for the whole modelling period is 990 mm, whereas TRACE calculates an amount of 977 mm. The deviation between the measured drainage amount of 158 mm and the amount predicted with TRACE (163 mm) is equal to an error of 3.4 %. A decrease in soil moisture during the first spring at 85 cm depth is not that well reproduced, which might be attributed to a plant compensation mechanism. Probably the plant adapts to the low soil moisture near the surface by taking out more water at deeper soil layers. The validation of the three-dimensional TRACE application showed that the groundwater levels measured at the field scale are, basically, well reproduced. Wells were selected, which are located rather in the middle of the test area than close to the boundary, since the model results and measured heads are supposed to be very similar near the boundary, where the measurements are used for the imposed boundary condition. The RMSE of these wells ranges between 0.33 and 0.68, which is adequate since no calibration of the model was carried out. The large-scaled GIS-supported GROWA model was applied for balancing water components at the catchment scale . For the model application datasets were used that were mainly provided by the geological survey of NRW and the [...]
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