The effects of climate change on surface hydrology in the San Jose watershed will be assessed with two models, YAM and BROOK90.

YAM is a model developed by Dan Moore, Georg Jost and David Hutchinson. It is derived from HBV-EC, the HBV model modified by Environment Canada, and offers several enhancements to the traditional HBV core. The basic idea behind YAM is to model the impact of landscape changes on streamflow with minimum data and parameter requirements, which makes the model ideal for data sparse modelling applications. Enhancements to HVB-EC include, amongst others, the possibility to tailor the formulation of hydrological processes to the model application, a more sophisticated representation of the forest canopy, and routing of stormflow between units (important for modeling over large areas).

BROOK90 is a lumped parameter model developed by Federer (Federer, Voeroesmarty, and Fekete, 2003) for the Hubbard Brook experimental forest, a well known ecosystem study site. A lumped model treats the watershed as a single unit with only one set of calculations for entire catchment. BROOK90 is a parameter-rich model designed primarily to study evapotranspiration and soil water movement at a point, with some provision for streamflow generation by different flow paths. The model can serve as a water balance model for land managers and for predicting climate change effects. As a complex water balance model, it can also be used as a basis for testing simpler models like YAM.

YAM will be used to address the overall sensitivity of streamflow in the San Jose watershed to climate change (larger scale model application). BROOK90 will allow a closer look at selected ecosystems to see how their water balance might be affected by climate change.

Federer, C. A., Voeroesmarty, C., and Fekete, B. (2003) Sensitivity of Annual Evaporation to Soil and Root Properties in Two Models of Contrasting Complexity. Journal of Hydro-meteorology, 4(6), 1276-1290.


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