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A Joint Soil‐Vegetation‐Atmospheric Water Tagging Procedure with WRF‐Hydro

Implementation and Application to the Case of Precipitation Partitioning in the Upper Danube River Basin
: Arnault, Joel; Wei, Jianhui; Rummler, Thomas; Fersch, Benjamin; Zhang, Zhenyu; Jung, Gerlinde; Wagner, Sven; Kunstmann, Harald

Fulltext urn:nbn:de:0011-n-5558448 (6.3 MByte PDF)
MD5 Fingerprint: 290d0ffba640d05f0f655282cce02a4a
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Created on: 7.9.2019

Water Resources Research 55 (2019), No.7, pp.6217-6243
ISSN: 0043-1397
Deutsche Forschungsgemeinschaft DFG
SFB TRR 165;
A5 - The role of soil moisture and surface- and subsurface water flows on predictability of convection
Journal Article, Electronic Publication
Fraunhofer IAO ()

Atmospheric models such as the Weather Research and Forecasting (WRF) model provide a tool to evaluate the behavior of regional hydrological cycle components, including precipitation, evapotranspiration, soil water storage, and runoff. Recent model developments have focused on coupled atmospheric‐hydrological modeling systems, such as WRF‐Hydro, in order to account for subsurface, overland, and river flow and potentially improve the representation of land‐atmosphere interactions. The aim of this study is to investigate the contribution of lateral terrestrial water flow to the regional hydrological cycle, with the help of a joint soil‐vegetation‐atmospheric water tagging procedure newly developed in the so‐called WRF‐tag and WRF‐Hydro‐tag models. An application of both models for the high precipitation event on 15 August 2008 in the German and Austrian parts of the upper Danube river basin (94,100 km²) is presented. The precipitation that fell in the basin during this event is considered as a water source, is tagged, and subsequently tracked for a 40‐month period until December 2011. At the end of the study period, in both simulations, approximately 57% of the tagged water has run off, while 41% has evaporated back to the atmosphere, including 2% that has recycled in the upper Danube river basin as precipitation. In WRF‐Hydro‐tag, the surface evaporation of tagged water is slightly enhanced by surface flow infiltration and slightly reduced by subsurface lateral water flow in areas with low topography gradients. This affects the source precipitation recycling only in a negligible amount.