EGU21-8443
https://doi.org/10.5194/egusphere-egu21-8443
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Capturing watershed water balance with a physically-based two-hydrological-variable model: Application to the Little Washita basin

Fanny Picourlat, Emmanuel Mouche, and Claude Mugler
Fanny Picourlat et al.
  • LSCE - Laboratory for Sciences of Climate and Environment, Gif-sur-Yvette, France (fanny.picourlat@lsce.ipsl.fr)

Hydrological processes import across scales is known to constitute a key challenge to improve their representation in large-scale land surface models. Since these models describe continental hydrology with vertical one dimensional infiltration and evapotranspiration, the challenge mainly resides in the dimensionality reduction of the processes. Departing from the catchment three-dimensional scale, previous work has shown that an equivalent two-dimensional hillslope model is able to simulate long term watershed water balance with good accuracy. This work has been done on the Little Washita basin (Ok, USA) using the integrated code HydroGeoSphere. Following this framework, we show that hillslope hydrology can be described by using realistic simplifying assumptions, such as linear water table profile. These assumptions allow the writing of an analytical model relying on two hydrological variables: the seepage face extension, which describe the intersection length between the water table and the land surface, and the water table slope. The last step of the work will be to use these key variables and this simplified description of the driving processes for importing small-scale hydrological processes into large-scale models.

How to cite: Picourlat, F., Mouche, E., and Mugler, C.: Capturing watershed water balance with a physically-based two-hydrological-variable model: Application to the Little Washita basin, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-8443, https://doi.org/10.5194/egusphere-egu21-8443, 2021.

Corresponding presentation materials formerly uploaded have been withdrawn.