Gesellschaft fur Angewandte Landschaftsforschung GALF BR

Dresden, Germany

Gesellschaft fur Angewandte Landschaftsforschung GALF BR

Dresden, Germany

Time filter

Source Type

Gebel M.,Gesellschaft fur Angewandte Landschaftsforschung GALF bR | Meissner R.,Helmholtz Center for Environmental Research | Halbfass S.,Gesellschaft fur Angewandte Landschaftsforschung GALF bR | Hagenau J.,Helmholtz Center for Environmental Research | Duan S.,Beijing Soil and Water Conservation Center
IForest | Year: 2014

Change of land use and agricultural management, combined with severe droughts during the last two decades, are the main reasons for a strong decrease of water quality and quantity in the Miyun reservoir (China). Due to semi-arid monsoon climate, episodic water fluxes have to be considered adequately in an integrated water resources management in the total catchment area. To get insight into runoff generation processes, sediment and nutrient source areas and transfer dynamics, a monitoring approach was established in the Miyun catchment area spanning from plot measurements with weighable gravitation lysimeters and in situ measurements to a subcatchment scale of approx. 10 km2. One of these subcatchments (Sheyuchuan) was selected to adapt the methodologies to the regional runoff pattern using the web GIS-based modeling tool STOFFBILANZ. Calibration of the daily runoff modeling is based on the lysimeter observations from Shixia station and runoff observations in Sheyuchuan subcatchment for the reference year 2011. Despite the fact that the climatic water balance in the region is negative, the precipitation event on 24 July 2011 with a rainfall of 107 mm caused a significant leachate at the lysimeter. The daily modeling for the lysimeter core by the FAO-ETc-adj approach showed a similar deep percolation and a similar distribution of evapotranspiration for the year considered. In the next step, the calibrated model was applied to the subcatchment Sheyuchuan to compare the results of direct runoff and groundwater runoff (deep percolation) with the runoff observations at the weir. Deep percolation was extremely small (1.7 mm yr−1), and direct runoff was 26.9 mm yr−1 in 2011. In comparison to the monitoring results at the weir, a disagreement in the quantity of runoff was found between the observation on the one hand and the simulation on the other hand, which can be explained by water storage in reservoirs for irrigation purposes. Additionally, the water fluxes in the total catchment area were simulated at meso-scale, obtaining a good correlation with observed values. © SISEF.


Halbfass S.,Gesellschaft fur Angewandte Landschaftsforschung GALF BR | Gebel M.,Gesellschaft fur Angewandte Landschaftsforschung GALF BR | Burger S.,Gesellschaft fur Angewandte Landschaftsforschung GALF BR
Advances in Geosciences | Year: 2010

In order to derive measures to reduce nutrient loadings into waters in Saxony, we calculated nitrogen inputs with the model STOFFBILANZ on the regional scale. Thereby we have to compare our modelling results to measured loadings at the river basin outlets, considering long term nutrient retention in surface waters. The most important mechanism of nitrogen retention is the denitrification in the contact zone of water and sediment, being controlled by hydraulic and micro-biological processes. Retention capacity is derived on the basis of the nutrient spiralling concept, using water residence time (hydraulic aspect) and time-specific N-uptake by microorganisms (biological aspect). Short time related processes of mobilization and immobilization are neglected, because they are of minor importance for the derivation of measures on the regional scale. © 2010 Author(s).


Gebel M.,Gesellschaft fur Angewandte Landschaftsforschung GALF BR | Halbfass S.,Gesellschaft fur Angewandte Landschaftsforschung GALF BR | Burger S.,Gesellschaft fur Angewandte Landschaftsforschung GALF BR | Friese H.,Saxon State Agency of the Environment | Naumann S.,Saxon State Agency of the Environment
Advances in Geosciences | Year: 2010

From 2005 to 2009 we modelled the input of nitrogen and phosphorus in waters in the area of the Federal State of Saxony (Germany). The model results are an important component in elucidating the present situation of nutrient loads in groundwater and surface water as well as its future development. The present contribution focuses on the modelling of diffuse nitrogen leaching on arable land. Processes of mobilization and immobilization of nitrogen are included in the modelling. They will be estimated as induced by the respective types of fruit, management practices and local conditions. Source areas can be derived using the relationship of nitrogen sources (mobilization, deposition) and sinks (immobilization, denitrification) on the regional scale. © 2010 Author(s).

Loading Gesellschaft fur Angewandte Landschaftsforschung GALF BR collaborators
Loading Gesellschaft fur Angewandte Landschaftsforschung GALF BR collaborators