Significance of scale and lower boundary condition in the 3D simulation of hydrological processes and soil moisture variability in a forested headwater catchment.

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Title:Main Title: Significance of scale and lower boundary condition in the 3D simulation of hydrological processes and soil moisture variability in a forested headwater catchment.
Description:Abstract: The measurement and simulation of soil moisture patterns and their spatio-temporal variability are current challenges in hydrology. This study investigated the capability of the three-dimensional model HydroGeoSphere to simulate hydrological processes, soil moisture dynamics and patterns at 25 and 100 m resolutions with daily and hourly time steps in a forested headwater catchment. All simulations reproduced discharge dynamics well, calculated a dominance of the baseflow component but missed macropore driven discharge peaks in the summer and slightly overestimated the discharge. A comparison of discharge and water balance results between daily and hourly time steps revealed considerable scaling issues of saturated conductivity values and in the model’s interception module. Temporally and spatially highly resolved soil moisture measurements were used to calibrate residual saturations and porosities at daily time steps. Therefore, all model setups simulated the long-term temporal soil moisture dynamics well, but short-term soil moisture dynamics were poorly simulated because the simulation did not take into account the effect of macropore flow. The spatial soil moisture patterns of the topsoil were well reproduced except for certain parts in the western part of the catchment. A correlation analysis revealed that the influence of the topography was overestimated in the simulated soil moisture pattern. The spatial scale dependency of all aforementioned results was small due to independent calibration. The consideration of bedrock damped discharge peaks, increased low flow and slightly improved temporal soil moisture simulation.
Identifier:10.1016/j.jhydrol.2014.01.060 (DOI)
Responsible Party
Creators:Thomas Cornelissen (Author), Bernd Diekkrüger (Author), Heye Bogena (Author)
Publisher:Elsevier
Publication Year:2014
Topic
TR32 Topic:Other
Related Subproject:C1
Subjects:Keywords: Hydrological Modelling, Pattern Analysis, Spatial Heterogeneity, Vegetation-Hyrology interactions
File Details
Filename:Cornelissen et al. 2014.pdf
Data Type:Text - Article
Size:14 Pages
File Size:2.7 MB
Date:Available: 04.02.2014
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:[TR32DB] Data policy agreement
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Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Journal of Hydrology
Volume:516
Number of Pages:14 (140 - 153)
Metadata Details
Metadata Creator:Thomas Cornelissen
Metadata Created:28.08.2014
Metadata Last Updated:28.08.2014
Subproject:C1
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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