Prior Research

Groundwater change and water quality in the Mexicali Valley

These projects mapped changes in groundwater levels and water quality and how they have changed in the Imperial and Mexicali Valleys from 1980-2018, a period when land use and water management changed dramatically. The results of this project will help identify areas that are sensitive to future land use change, and where water quality impairs agricultural production. Students involved:  Rodney Feddema (MS), Sarah Roberts (MS).

Land cover and socioeconomic status, 2008-2010
Funded by Southwest Consortium on Environmental Research and Policy (SCERP), US EPA, 

This project aimed to map land cover and its relationship to socioeconomic status in Tijuana.

Biggs, T. W., *Anderson, W. G., & Pombo, O. A. 2014. Concrete and Poverty, Vegetation and Wealth? A Counterexample from Remote Sensing of Socioeconomic Indicators on the U.S.–Mexico Border. The Professional Geographer, 1–14. http://doi.org/10.1080/00330124.2014.905161

Biggs, T. W., *Atkinson, E., Powell, R., & Ojeda-Revah, L. (2010). Land cover following rapid urbanization on the US–Mexico border: Implications for conceptual models of urban watershed processes. Landscape and Urban Planning, 96(2), 78–87. http://doi.org/10.1016/j.landurbplan.2010.02.005

Anoxia and hydrodynamics in lakes and reservoirs

Land use change can change loading rates of nutrients to water bodies, sometimes resulting in seasonal anoxia in lakes and reservoirs.  Aeration devices can be used to oxygenate anoxic waters. In one cooperative project between SDSU and the San Diego River Park Foundation, members of the Biggs Lab are monitoring the impact of aerators on dissolved oxygen in pools of the lower San Diego River. See here a summary of SDSU projects on the lower San Diego River.  Previous projects analyzed and modelled dissolved oxygen in reservoirs of San Diego County.  Students involved:  Rodney Feddema (MS), Tigran Ghanuskovyan (MPH), Environmental Science Undergraduates, Kimberly Livers (BS), Raymond Lee.

*Lee, R., Biggs, T., & Fang, X. (2018). Thermal and Hydrodynamic Changes under a Warmer Climate in a Variably Stratified Hypereutrophic Reservoir. Water . https://doi.org/10.3390/w10091284

*Lee, R. M., & Biggs, T. W. (2015). Impacts of land use, climate variability, and management on thermal structure, anoxia, and transparency in hypereutrophic urban water supply reservoirs. Hydrobiologia, 745(1). http://doi.org/10.1007/s10750-014-2112-1

* indicates a student co-author.