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9960940 
Book/Book Chapter 
Water quality management: modeling of nutrient emissions with MONERIS 
Venohr, M; Natho, S; Hofmann, J 
2017 
Konzepte fuer die nachhaltige Entwicklung einer Flusslandschaft 
8 
229-275 
WOS:000467819500010 
In recent years, water quality problems of surface waters within the Guanting basin have been a serious topic on the agenda of Chinese water authorities. Considering the limits set by climatic, environmental and economic needs, the main task of water quality management is to adjust land use and especially agricultural pressures on the state of the water resources to guarantee water availability of sufficient quality in a sustainable way. Hence, a combined approach was developed by an interdisciplinary model chain, consisting of climate simulation with the STARS and CCLM model (Chapter 3), calculation of natural water availability with the eco-hydrological model SWIM (Chapter 4), quantification of water management effects with the water quantity management model WBalMo (Chapter 7) and analysis of nutrient pollution origin with the nutrient emission model MONERIS (MOdeling Nutrient Emissions in RIver Systems). The calculation of MONERIS includes nutrient emissions into surface waters, in-stream retention and resulting loads for nitrogen (N) and phosphorus (P) on a river catchment scale (Behrendt et al. 2002, Venohr et al. 2011). The main objective for the application and further development of MONERIS was to identify diffuse and point sources emissions for hydrological sub-catchments, later called analytical units (AU) and to derive and analyze scenarios on nutrient emissions and water quality in the Guanting basin. For the Guanting basin we: (1) studied the water flow path with special attention to groundwater / surface water interactions, (2) analyzed the role of nitrogen surplus on agricultural land at AU scale, (3) quantified the nitrogen and phosphorus fluxes of point and diffuse sources and (4) calculated the effects of selected nutrient reduction measures including alternatives for agricultural practices (e.g. water saving methods, shifting the cash crop from maize to millet) for several time periods (from 2018 to 2037, Section 9.4) under consideration of climate change. The interdisciplinary model chain provides an appropriate tool for a sustainable and integrated river basin management for large scales.