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Computational Hydrologist

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Date: Apr 13, 2019

Location: Oak Ridge, TN, US, 37831

Company: Oak Ridge National Laboratory

Requisition Id 860 

Compensation Band Level:R&D Associate Staff Member/Band 2 


The Computational Science and Engineering Division in the Computing and Computational Sciences Directorate and the Climate Change Science Institute ( at the Oak Ridge National Laboratory (ORNL) seeks to hire a Research Scientist in the area of algorithmic development for Earth System Modeling, specifically in the areas of hydrologic and hydraulics  simulation.


Major Duties/Responsibilities:

  • You will contribute to ORNL and multi-lab efforts to develop and implement novel algorithms for next generation global and regional hydrologic and flood models, to be executed on pre-exascale architectures and in preparation for exascale.
  • You will collaborate with highly diverse and multidisciplinary teams of computer scientists, applied mathematicians, civil engineers, climate and weather scientists, and computational scientists at ORNL's Climate Change Science Institute (CCSI), other DOE Labs, and partner universities and provide expertise in the areas of advanced algorithms and Earth system model development and execution. 
  • You will join a growing team within CCSI focused on the development and analysis of Earth system models for advanced architectures to address pressing science questions for Earth systems. Maximizing computational performance on hybrid and multicore architectures that are slated to be among the fastest in the world is a priority.
  • Author peer reviewed papers, technical reports and proposals for internal and external release and represent the organization by giving technical presentations in large public forums.
  • Be a part of a vibrant collaborative research environment which will provide the opportunity to perform cutting-edge research in high-performance computing, using ORNL’s Leadership Class Supercomputer.
  • Maintain membership in professional, academic, and research organizations.



Basic Qualifications:

A Ph.D. degree in applied mathematics, computer science, computational science, civil engineering and/or earth science.


Preferred Qualifications:

  • Experience with solution algorithms, coupling of components and processes, nonlinear and linear solvers, limiters, and/or other numerical issues common with complex codes within earth system models of varying complexity
  • Familiarity with computational scalability and efficiency, as applied to hybrid multi-petascale supercomputing systems
  • Experience developing and executing large scientific simulations on multi-petascale supercomputing systems
  • Extensive programming experience in more than one of the following: Fortran, C++, python, OpenMP, OpenACC and CUDA
  • Experience using solver and other numerical libraries such as Petsc, Trilinos etc. and revision control systems including svn and Git
  • Demonstrated excellent interpersonal skills for working within a highly diverse team, strong oral and written communications skills, good organizational skills, and high personal motivation
  • Familiarity with advanced I/O libraries, NetCDF and HDF file formats, and other related issues of data movement and processing
  • Possess a general understanding of the nature and behavior of classical physics problems that exist in Earth system model components (fluid flow, porous media and land surface processes, cloud physics and radation, chemistry transport) 
  • A recognition and adherence to modern software engineering practices and standards to enable contribution and leadership for a large team-based model development process


ORNL Ethics and Conduct:

As a member of the ORNL scientific community, you will be expected to commit to ORNL's Research Code of Conduct. Our full code of conduct, and a statement by the Lab Director's office can be found here:


Benefits at ORNL:  

UT Battelle offers an exceptional benefits package to include matching 401K, Pension Plan, Paid Vacation and Medical / Dental plan. Onsite amenities include Credit Union, Medical Clinic and free Fitness facilities.   



UT Battelle offers a wide range of relocation benefits for individuals and families to make it easier to come and work here. If you are invited to interview, please ask your Recruiter about relocating with ORNL. 








This position will remain open for a minimum of 5 days after which it will close when a qualified candidate is identified and/or hired.

We accept Word (.doc, .docx), Adobe (unsecured .pdf), Rich Text Format (.rtf), and HTML (.htm, .html) up to 5MB in size. Resumes from third party vendors will not be accepted; these resumes will be deleted and the candidates submitted will not be considered for employment.

If you have trouble applying for a position, please email

ORNL is an equal opportunity employer. All qualified applicants, including individuals with disabilities and protected veterans, are encouraged to apply.  UT-Battelle is an E-Verify employer.

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