Los Alamos National Laboratory

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Sachin Pandey

Sachin Pandey

Phone (505) 665-4640


My research focuses on the advanced scientific understanding of hydro-geochemistry in the shallow subsurface through the use of state-of-the-art computational models. I enjoy collaborating with computational scientists to employ modern algorithms, along with field and laboratory experts to collect and incorporate high quality datasets that help constrain model parameters. I have developed first-principles based numerical models that couple vadose zone hydrology, geochemistry, and microbiology over a wide range of spatio-temporal scales. Applications include investigating:

  • The discrepancy between laboratory and field determined mineral weathering rates and the observed decrease of dissolution rates as minerals age in the Critical Zone,
  • The influence of environmental uncertainties such as preferential flow and climate change on hydrochemistry and solute effluxes,
  • The influence of soluble microbial products (SMP) resulting from biostimulation on metals complexation and subsequent inhibition of acid rock drainage,
  • The dual-domain behavior of reactive flows in mine waste rock,
  • Geochemical controls on anthropogenic contaminant (e.g. Chromium, RDX) transport in groundwaters and evaluation of different biological and chemical remediation strategies.


Ph.D., Civil Engineering, University of Colorado, Boulder, Colorado, 2015

B.S., Civil Engineering, Temple University, Philadelphia, Pennsylvania, 2010


LANL Positions

Postdoctoral Research Associate, Computational Earth Science (EES-16) Group, 2016-Present


Professional Societies

American Geophysical Union (AGU)

American Society for Civil Engineers (ASCE)



Dean’s Outstanding Merit Fellowship, University of Colorado at Boulder, 2010-2012

Creative Arts, Research, and Scholarship Grant, Temple University, 2010

John L. Rumpf Award (Honorable Mention), Temple University, 2010



Pandey, Sachin and Harihar Rajaram. “Analyzing the response of acid rock drainage in a mineralized watershed to climate change using reactive transport models.” Water Resources Research (In preparation).

Pandey, Sachin and Harihar Rajaram. “Modeling the influence of preferential flow on mineral weathering rates in the Critical Zone.” Water Resources Research (In review).

Pandey, Sachin. "Advances in Reactive Transport Modeling of Geochemical Systems: Applications to Acid Rock Drainage and the Evolution of the Critical Zone." Doctorial Dissertation, University of Colorado at Boulder, 2015.

Pandey, Sachin and Harihar Rajaram. “Investigating the influence of subsurface heterogeneity on chemical weathering in the critical zone using high resolution reactive transport models.” AGU Fall Meeting Abstracts, vol. 1, p. 3599, December 2014.

Yacob, Tesfayohanes, Sachin Pandey, Harihar Rajaram, and JoAnn Silverstein. “Soluble microbial products decrease pyrite oxidation by ferric iron at pH<2.” Environmental Science & Technology 47.15 (2013): 8658-8665.

Pandey, Sachin, Tesfayohanes W. Yacob, JoAnn Silverstein, and Harihar Rajaram. “Prevention of Acid Mine Drainage Through Complexation of Ferric Iron by Soluble Microbial Growth Products.” AGU Fall Meeting Abstracts, vol. 1, p. 1370. December 2011.

Pandey, Sachin, Rupal Patel, and Jesse Minsky. “Stormwater Management Practices at Temple University Main Campus.” ASCE World Environmental & Water Resources Congress, Student Design Competition, May 2010.