The hydroclimatology team investigates the interactions of the subsurface-land-surface-atmosphere. A fully-coupled hydrologic-land-surface model is developed and tested on SSHO to study the subsurface-land-surface interaction.
Image: Eddy flux tower and weather station on ridge top at the SSHCZO.
Subsurface-land surface-atmosphere interaction: The instrument array at Susquehanna Shale Hills Critical Zone Observatory (SSHO) enables an unprecedented investigation of the subsurface-land-surface-atmosphere interaction. A fully-coupled hydrologic-land-surface model is developed and tested on SSHO to study the subsurface-land-surface interaction. The questions being researched include:
1) How does the hydrologic modeling system, driven by satellite observations and meteorological reananalyses improve the prediction of flood and drought conditions?
2) How does the fully-coupled hydrologic-land-surface modeling system improve the prediction of surface energy balance (SEB)?
3) What are the impacts of upland recharge, groundwater redistribution, root uptake of water, and water table fluctuations on SEB?
4) What are the impacts of vegetation (vegetation fraction, leaf area index, etc.) on hydrologic and land-surface systems?
5) How do the model parameter values affect the coupled processes in the modeling system?
Figure 1. Grid setting for SSHO model domain. Locations of RTHnet wells, flux tower, weather station, and outlet gauge are also presented
The model reproduces realistic topographically-induced distributions of water table, soil moisture, and skin temperature. The simulated river discharge shows good agreement with outlet gauge measurements (Figure 3).
Figure 3. Comparison of hourly river discharge between model simulation and RTHnet measurements from 01 May to 01 Sept 2009.
Figure 4. Comparison of sensible heat flux (H). latent heat flux (LE), and net radiation (Rn) (from top to bottom) between model and flux tower from 01 Aug to 01 Sept 2009.
This fully-coupled model of the atmosphere, land surface and subsurface may yield significant improvements in both flood/drought forecasting and in weather forecasting, and provide a valuable chance to study the subsurface-land surface-atmosphere interactions.
Figure 5. Simulated sensible heat flux, latent heat flux, ground heat flux (G), and surface skin temperature (Tskin) as functions of water table depth.
Hydroclimatology team: Kenneth Davis (PI, firstname.lastname@example.org), Yuning Shi (PhD student, email@example.com), Burkely Twiest (undergraduate student, firstname.lastname@example.org)
Shale Hills, INVESTIGATOR