Influence of spatial resolution on the simulation of spatiotemporal soil moisture variability in a forest catchment using the model HydroGeoSphere
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| Title: | Main Title: Influence of spatial resolution on the simulation of spatiotemporal soil moisture variability in a forest catchment using the model HydroGeoSphere |
| Description: | Abstract: Soil moisture is a key variable in the soil-plant-atmosphere system because it interacts with various components of the system. The measurements as well as the simulation of the soil moisture pattern and its spatio-temporal variability are current challenges in hydrology. This study applies the model HydroGeoSphere in a natural forest ecosystem to assess the model’s capability to simulate the spatio-temporal variability and pattern of soil moisture by comparing the simulation results with soil moisture measurements. The model is used at two different model resolutions to reveal the scale dependency of the calibrated model parameters, the water balance, the discharge components and the spatial distribution of soil moisture and its variogram parameters. Discharge simulation results show that the model is capable of reproducing the discharge characteristics. A weak correlation is found between the simulated and soil moisture dynamics and the measured dynamics in the topsoil but the correlation is stronger in 20 cm depth. In 50 cm depth, the model is not able to reproduce the dynamics because preferential flow is not simulated. A pronounced scale dependency of groundwater flow can be observed with a higher rate at the coarser grid scale. Furthermore, the calibration of porosities supports previous findings that an upscaling of the applied model causes a decrease in transpiration and an increase in absolute soil moisture because porosities had to be increased lesser at the coarser model resolution than at the finer model resolution to achieve a good match between simulated and observed soil moisture. A decrease in soil moisture variance during continued drying is observed for both resolutions. The larger decrease for the finer model resolution is attributed to a more detailed topography. Transpiration prevails in still wet areas causing high variances. During continued drying, wetter areas also dry out and consequently decrease the variance. Last but not least, a pronounced scale dependency of the range values of the calculated variograms was observed which was explained by anisotropy in simulated soil moisture of the coarser resolution. The anisotropy was again attributed to differences in topography as a coarsening of topographic features leads to stronger soil moisture differences between valleys and plateaus. |
Responsible Party
| Creator: | Thomas Cornelissen (Author) |
| Publisher: | CRC/TR32 Database (TR32DB) |
| Publication Year: | 2013 |
Topic
| TR32 Topic: | Vegetation |
| Related Subproject: | C1 |
| Subject: | Keyword: PhD Report |
File Details
| Filename: | Report3_Cornelissen_2013.pdf |
| Data Type: | Text - Text |
| File Size: | 426 KB |
| Date: | Available: 31.01.2013 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Only Project Members |
| General Access and Use Conditions: | According to the TR32DB data policy agreement. |
| Access Limitations: | According to the TR32DB data policy agreement. |
| Licence: | [TR32DB] Data policy agreement |
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Specific Information - Report
| Report Date: | 31st of January, 2013 |
| Report Type: | PhD Report |
| Report City: | Bonn, Germany |
| Report Institution: | Department of Geography, Hydrology Research Group, University Bonn |
| Number of Pages: | 10 (1 - 10) |
| Further Information: | TR32 Student Report Phase II |
Metadata Details
| Metadata Creator: | Thomas Cornelissen |
| Metadata Created: | 04.12.2013 |
| Metadata Last Updated: | 04.12.2013 |
| Subproject: | C1 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Metadata Downloads: | 0 |
| Dataset Downloads: | 1 |
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