Groundwater Nitrate / SBX2 1 Project
Groundwater Nitrate / SBX2 1 Project
Groundwater Nitrate / SBX2 1 Project
University of California
Groundwater Nitrate / SBX2 1 Project


Scientific Journal Publications

Henri, C.V. and T. Harter, 2022. Denitrification in heterogeneous aquifers: Relevance of spatial variability and performance of homogenized parameters. Adv. in Water Resour., (open access)

Edwards, E.C., C. Nelson, T. Harter, C. Bowles, X. Li, B. Lock, G.E. Fogg, B. S. Washburn, 2022. Potential effects on grouwdater quality associated with infiltrating stormwater through dry wells for aquifer recharge. J. Contam. Hydrol. 246, (open access)

Greenhalgh, S., K. Mueller, S. Thomas, M.L. Campbell, and T. Harter, 2022. Raising the voice of science in complex socio-political contexts: an assessment of contested water decisions. J. Env. Policy & Planning 24(2):242-260, (open access)

Kourakos, G. and T. Harter, 2021. Simulation of unconfined aquifer flow based on parallel adaptive mesh refinement. Water Resour. Res. 57(12), e2020WR029354, (open access)

Green, C.T., K.M. Ransom, B.T. Nolan, L.Liao, and T. Harter, 2021. Machine learning predictions of mean ages of shallow well samples in the Great Lakes Basin, USA. J. Hydrology 603, 126908,

Castaldo, G., A. Visser, G.E. Fogg, T. Harter, 2021. Effect of groundwater age and recharge source on nitrate concentrations in domestic wells in the San Joaquin Valley. Env. Sci. Technol. 55(4):2265-2275, doi:10.1021/acs.est.0c03071 (open access)

Waterhouse H., T. Broadhead, A. Massell, H. Dahlke, T. Harter, D. Mountjoy, 2021. Management considerations for protecting groundwater quality under agricultural managed aquifer recharge. Sustainable Conservation, Research Brief

Pauloo, R.A., G.E. Fogg, Z. Guo, T. Harter, 2021. Anthropogenic basin closure and groundwater salinization (ABCSAL). J. Hydrology 593, 125787, doi:10.1016/j.jhydrol.2020.125787

Gurevich, H., S. Baram, T. Harter, 2021. Measuring nitrate leaching across the critical zone at the field to farm scale. Vadose Zone Journal, 20, e20094, doi:10.1002/vzj2.20094 (open access)

Henri, C.V., T. Harter, E. Diamantopoulos, 2021. Stochastic assessment of the effect of land-use change on nonpoint source-driven groundwater quality using an efficient scaling approach. Stochastic Environmental Research and Risk Assessment 35(5):959-970, doi:10.1007/s00477-020-01869-y (open access)

Miller, C.M.F., H. Waterhouse, T. Harter, J.G. Fadel, D. Meyer, 2020. Quantifying the uncertainty in nitrogen application and groundwater nitrate leaching in manure based cropping systems. Agricultural Systems 184, doi: 10.1016/j.agsy.2020.102877.

Bastani, M., T.Harter, 2020. Effects of upscaling temporal resolution on groundwater nitrate transport model performance at the regional management scale. Hydrogeology J., doi:10.1007/s10040-020-02133-x (open access)

Henri, C., T. Harter, 2020. On the conceptual complexity of non-point source management: Impact of spatial variability. Hydrol. and Earth Systems Sci, doi:10.5194/hess-24-1189-2020 (open access)

Bastani, M. and T. Harter, 2019. Source area management practices as remediation tool to address groundwater nitrate pollution in drinking supply wells. J.Contam.Hydrol. 226 (103521), 17p., doi:10.1016/j.jconhyd.2019.103521 (open access)

Henri, C. and T. Harter, 2019. Stochastic assessment of nonpoint source contamination: Joint impact of aquifer heterogeneity and well characteristics on management metrics. Water Resour. Res., doi:10.1029/2018WR024230 (open access)

Owen, D., A. Cantor, N. Green Nylen, T. Harter, and M. Kiparsky, 2019. California groundwater management, science-policy interfaces, and the legacies of artificial legal distinctions. Env. Res. Lett. 14(4). doi:10.1088/1748-9326/ab0751

Ransom, K.M., A.M. Bell, Q.E. Barber, G. Kourakos, and T.Harter, 2018. A Bayesian approach to infer nitrogen loading rates from crop and land-use types surrounding private wells in the Central Valley, California. Hydrol. Earth Syst. Sci., 22:2739-2758, 2018, doi:10.5194/hess-22-2739-2018.

Harter, T., K. Dzurella, G. Kourakos, A. Hollander, A. Bell, N. Santos, Q. Hart, A.King, J. Quinn, G. Lampinen, D. Liptzin, T. Rosenstock, M. Zhang, G.S. Pettygrove, and T. Tomich, 2017. Nitrogen Fertilizer Loading to Groundwater in the Central Valley. Final Report to the Fertilizer Research Education Program, Projects 11-0301 and 15-0454, California Department of Food and Agriculture and University of California Davis, 325p.

Ransom, K.M., and T. Harter, 2017. Groundwater nitrate sources and contamination in the Central Valley. California Water Blog, September 18, 2017.

Ransom, K.M., B.T. Nolan, J.A. Traum, C.C. Faunt, A.M. Bell, J.M. Gronberg, D.C. Wheeler, C.Z. Rosecrans, B.Jurgens, G.E. Schwarz, K. Belitz, S.M. Eberts, G. Kourakos, and T. Harter, 2017. A hybrid machine learning model to predict and visualize nitrate concentration throughout the Central Valley aquifer, California, USA, Science of The Total Environment, Volumes 601–602 (1), p. 1160-1172, doi:10.1016/j.scitotenv.2017.05.192  (open access).

Baram, S., V. Couvreur, T. Harter, M. Read, P.H. Brown, M. Kandelous, D.R. Smart, and J.W. Hopmans, 2016. Estimating Nitrate Leaching to Groundwater from Orchards: Comparing Crop Nitrogen Excess, Deep Vadose Zone Data-Driven Estimates, and HYDRUS Modeling. Vadose Zone J. 15. doi:10.2136/vzj2016.07.0061.

Ransom, K. M., M. N. Grote, A. Deinhart, G. Eppich, C. Kendall, M. E. Sanborn, A. K. Souders, J. Wimpenny, Q.-Z. Yin, M. Young, and T. Harter, 2016. Bayesian nitrate source apportionment to individual groundwater wells in the Central Valley by use of elemental and isotopic tracers, Water Resour. Res., 52, 5577–5597, doi:10.1002/2015WR018523 (open access).

Geisseler, D., 2016. Nitrogen concentrations in harvested plant parts - a literature overview. Report to the Kings River Watershed Coalition and to the Central Valley Regional Water Board Irrigated Lands Regulatory Program, 157p.

Edwards, E. C., Harter, T., Fogg, G. E., Washburn, B., & Hamad, H. (2016). Assessing the Effectiveness of Drywells as Tools for Stormwater Management and Aquifer Recharge and Their Groundwater Contamination Potential. Journal of Hydrology 539:539-553, doi:10.1016/j.jhydrol.2016.05.059.

Baram S., V. Couvreur, T. Harter, M. Read, P.H. Brown, J.W. Hopmans, D.R. Smart, 2016. Assessment of orchard N losses to groundwater with a vadose zone monitoring network. Agricultural Water Management 172:83-95. doi:10.1016/j.agwat.2016.04.012 

Tomich, T. et al, 2016. California Nitrogen Assessment.

Harter, T., 2015. California's agricultural regions gear up to actively manage groundwater use and protection. California Agriculture 69(3):193-201, doi:10.3733/ca.E.v069n03p193 (open access)

Mayzelle, M. M., J. H. Viers, J. Medellin-Azuara, and T. Harter, 2015. Economic feasibility of irrigated agricultural land use buffers to reduce groundwater nitrate in rural drinking water sources. Water 7(1):12-37, doi: 10.3390/w7010012 (open access).

Dzurella, K.N., G. S. Pettygrove, A. Fryjoff-Hung, A. Hollander, and T. Harter, 2015. Potential to assess nitrate leaching vulnerability of irrigated cropland. J. Soil and Water Conservation 70(1):63-72, doi: 10.2489/jswc.70.1.63 (open access).

Kourakos, G., and T. Harter, 2014. Parallel simulation of groundwater non-point source pollution using algebraic multigrid preconditioners. Comput. Geosci.,  doi:10.1007/s10596-014-9430-2
Rosenstock, T. S., D. Liptzin, K. Dzurella, A. Fryjoff-Hung, A. Hollander, V. Jensen, A. King, G. Kourakos, A. McNally, G. S. Pettygrove, J. Quinn, J. H. Viers, T. P. Tomich, and T. Harter, 2014. Agriculture's contribution to nitrate contamination of Californian groundwater (1945-2005), J. Env. Qual. 43(3):895-907,  doi:10.2134/jeq2013.10.0411 (open access).
Liang, X. Q., T. Harter, L. Porta, C. van Kessel, and B. A. Linquist, 2014. Nitrate leaching in Californian rice fields: A field- and regional-scale assessment, J. Env. Qual. 43(3):881-894,  doi:10.2134/jeq2013.10.0402.
Jensen, V. B., J. L. Darby, C. Seidel, and C. Gorman, 2013: Nitrate in Potable Water Supplies: Alternative Management Strategies, Critical Reviews in Environmental Science and Technology, doi: 10.1080/10643389.2013.828272.
Dzurella, K. and T. Harter, 2013. Nitrogen fertilizer loading to groundwater in the Central Valley. 2013 Annual Interpretive Summary, Ca. Dept. Food & Agriculture, Fertilizer Research and Education Program, Project 11-0301, September 2013.
Nitrate Groundwater Pollution Hazard Index (website; Index has been updated as part of the SBX2 1 project)
Rosenstock, T.S., D. Liptzin, J. Six, and T.P. Tomich, 2013. Nitrogen fertilizer use in California: Assessing the data, trends, and a way forward. California Agriculture 67(1):68-79, doi:10.3733/ca.E.v067n01p68 (free public access).
Kourakos, G. and T. Harter, 2014. Vectorized simulation of groundwater flow and streamline transport. Environmental Modelling & Software 52:207-221, doi:10.1016/j.envsoft.2013.10.029.
Lockhart, K.M., A. M. King, T. Harter, 2013. Identifying sources of groundwater nitrate contamination in a large alluvial groundwater basin with highly diversified intensive agricultural production. J. Contam. Hydrol. 151:140-154,  doi:10.1016/j.jconhyd.2013.05.008 ( pdf file for personal use only).
Bremer, J. and T. Harter, 2012. Domestic wells have high probability of pumping septic tank leachate, Hydrol. Earth Syst. Sci. 16:2453-2467, doi:10.5194/hess-16-2453-2012 (free public access).
Fryjoff-Hung, A, Hollander, A.D., McNally, A., King, A.M., Canada, H.E., Honeycutt, K., Liptzin, D., Rosenstock, T.S., Viers, J.H., & Harter, T. (2012)  The Geography of Nitrate in Groundwater: A Look at California in:  Esri Map Book , Vol. 27. Esri Press, Redlands. pg. 84
Medellin, J., T.S. Rosenstock, R.E. Howitt, T. Harter, K.K. Jessoe, K. Dzurella, G.S. Pettygrove, J.R. Lund, 2012. Agro-economic analysis of nitrate crop source reductions. J. Water Resources Planning and Mgmt., doi:10.1061/(ASCE)WR.1943-5452.0000268. ( pdf file for personal use)
Kourakos, G., F. Klein, A. Cortis, and T. Harter, 2012, A groundwater nonpoint source pollution modeling framework to evaluate long-term dynamics of pollutant exceedance probabilities in wells and other discharge locations,Water Resour. Res., 48, W00L13,  doi:10.1029/2011WR010813.
Kourakos, G., F. Klein, and T. Harter, 2012. A GIS-linked unit response function approach to stochastic groundwater nonpoint source pollution modeling, Models - Repositories of Knowledge,  IAHS Publications (Red Book Series#355), 2013. 8 pages.
Webmaster Email: