Back to the basics: Using observations and interpretation to define watershed model structure. A case study in the Upper Coastal Plain, US.

Abstract:

This study outlines the development and use of an integrated catchment model that has been developed as part of a long-term project focused on impacts of short-rotation loblolly pine production as a biofuel feedstock. The field-related aspects of the project were initiated in 2009 and focused on the development of a baseline dataset developed from hydrometric, isotopic, and water quality monitoring of a set of small paired catchments. In the winter of 2013 a series of treatments, representing typical forest management strategies in the southeastern US were implemented, and monitoring will continue through 2018. We have used the available long-term measurements to outline a conceptual model of catchment hydrology in this region which is characterized by low gradient slopes and deep sandy soils. The conceptual model has been translated into an object-oriented landscape modeling framework, allowing for the development of a set of long term landuse scenarios which serve as temporally-varying boundaries conditions for the catchment model. The presentation focuses primarily on these modeling results, with particular emphasis on the influence of short rotation harvest on groundwater recharge and stream water quantity over decadal scales.