Raj Shekhar Singh
San Francisco, California, United States
7K followers
500+ connections
About
I'm a passionate builder and investor driven by the potential of technology to create…
Activity
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We at z21 Ventures are so excited to initiate this program. Indian Institute of Technology, Kharagpur students are doing very well across the board…
We at z21 Ventures are so excited to initiate this program. Indian Institute of Technology, Kharagpur students are doing very well across the board…
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Experience
Education
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UC Berkeley
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Activities and Societies: Graduate student researcher at Lawrence Berkeley National Labs Graduate researcher at NSA JPL Graduate researcher at UC Irvine
My Ph.D. research was on finding new data assimilation and modeling techniques that helped improve predictive modeling of groundwater at high-resolution and high data fidelity.
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Activities and Societies: General Secretary of social and Cultural events, Head Procurement Team Spring Fest, Assistant Coordinator Banners Team Kshitij, Secretary Communiqué , DramaticsSecretary , Football Team , Hockey Team
Completed my BTech with Honors from IIT kharagpur in Biotechnology and Biochemical Engineering. My Honors Project here was on Hydrogen production from waste water using microbial fuel cells.
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Completed the MOT diploma offered by Haas School of business together with UC Berkeley Engineering School to Graduate students interested in learning about entrepreneurship, business and Marketing
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Activities and Societies: Elected Vice-Captain , St. Xavier’s School, Bokaro
Vice Captain of the School
Licenses & Certifications
Volunteer Experience
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Co-Founder
YourAdhikar
- 3 years 6 months
Civil Rights and Social Action
YourAdhikar was the largest online RTI filing platform in India. It allowed its users to demand/obtain information from the government and share it with wider community.
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Team member
Nalanda 2.0
- Present 8 years 2 months
Education
Nalanda 2.0 is a nonprofit and a nonpartisan group committed to the public interest . Epitomized by the Nalanda University of 1400+ years ago, Nalanda 2.0 wants to usher excellence into India's higher education system. Now.
Publications
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Toward hyper‐resolution land‐surface modeling: The effects of fine‐scale topography and soil texture on CLM4. 0 simulations over the Southwestern US
Water Resources research
Increasing computational efficiency and the need for improved accuracy are currently driving the development of “hyper-resolution” land-surface models that can be implemented at continental scales with resolutions of 1 km or finer. Here we report research incorporating fine-scale grid resolutions into the NCAR Community Land Model (CLM v4.0) for simulations at 1, 25, and 100 km resolution using 1 km soil and topographic information. Multiyear model runs were performed over the Southwestern…
Increasing computational efficiency and the need for improved accuracy are currently driving the development of “hyper-resolution” land-surface models that can be implemented at continental scales with resolutions of 1 km or finer. Here we report research incorporating fine-scale grid resolutions into the NCAR Community Land Model (CLM v4.0) for simulations at 1, 25, and 100 km resolution using 1 km soil and topographic information. Multiyear model runs were performed over the Southwestern U.S., including the entire state of California and the Colorado River basin. The results show changes in the total amount of CLM-modeled water storage, and changes in the spatial and temporal distributions of water in snow and soil reservoirs, as well as changes in surface fluxes and the energy balance. To inform future model progress and continued development needs and weaknesses, we compare simulation outputs to station and gridded observations of model fields. Although the higher grid-resolution model is not driven by high-resolution forcing, grid resolution changes alone yield significant improvement (reduction in error) between model outputs and observations, where the RMSE decreases by more than 35%, 36%, 34%, and 12% for soil moisture, terrestrial water storage anomaly, sensible heat, and snow water equivalent, respectively. As an additional exercise, we performed a 100 m resolution simulation over a spatial subdomain. Those results indicate that parameters such as drainage, runoff, and infiltration are significantly impacted when hillslope scales of ∼100 m or finer are considered, and we show the ways in which limitations of the current model physics, including no lateral flow between grid cells, may affect model simulation accuracy.
Other authorsSee publication -
Dissertation thesis: Hyper-Resolution Global Land Surface Model at Regional-to-Local Scales with observed Groundwater data assimilation
ProQuest
Modeling groundwater is challenging: it is not readily visible and is difficult to measure, with limited sets of observations available. Even though groundwater models can reproduce water table and head variations, considerable drift in modeled land surface states can nonetheless result from partially known geologic structure, errors in the input forcing fields, and imperfect Land Surface Model (LSM) parameterizations. These models frequently have biased results that are very different from…
Modeling groundwater is challenging: it is not readily visible and is difficult to measure, with limited sets of observations available. Even though groundwater models can reproduce water table and head variations, considerable drift in modeled land surface states can nonetheless result from partially known geologic structure, errors in the input forcing fields, and imperfect Land Surface Model (LSM) parameterizations. These models frequently have biased results that are very different from observations. While many hydrologic groups are grappling with developing better models to resolve these issues, it is also possible to make models more robust through data assimilation of observation groundwater data. The goal of this project is to develop a methodology for high-resolution land surface model runs over large spatial region and improve hydrologic modeling through observation data assimilation, and then to apply this methodology to improve groundwater monitoring and banking.
The high-resolution LSM modeling in this dissertation shows that model physics performs well at these resolutions and actually leads to better modeling of water/energy budget terms. The overarching goal of assimilation methodology is to resolve the critical issue of how to improve groundwater modeling in LSMs that lack sub-surface parameterizations and also run them on global scales. To achieve this, the research in this dissertation has been divided into three parts. The first goal was to run a commonly used land surface model at hyper resolution (1 km or finer) and show that this improves the modeling results without breaking the model. The second goal was to develop an observation data assimilation methodology to improve the high-resolution model. The third was to show real-world applications of this methodology.
Honors & Awards
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NSF I corps
National Science Foundation
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GSVC western region finals
GSVC - Haas School of business
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McCone Fellowhsip
University of California, Berkeley
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PK Sinha Fellowship
Prabha Sinha (Founder, ZS Associates)
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National Science Olympiad
National Science Olympiad, India
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National Education Council Scholarship
National Education Council, India
Languages
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Hindi
Native or bilingual proficiency
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Bengali
Limited working proficiency
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Chinese
Elementary proficiency
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English
Native or bilingual proficiency
Organizations
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National Groundwater Association
Member
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American Geophysical Union
Member
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LP / GP dinner was great last night!! Thanks to Jenny He Cindy Bi and Charlie Stephens at Fidelity Investments for sponsoring
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One of my favorite things to do as I travel is meet friends and fellow alums from my alma mater IIT Kgp. Over the last couple of weeks I got a chance…
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An absolute pleasure speaking with our earliest supporter and mentor, Mukesh Bansal, on his SparX Podcast, where we explored the future of space…
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🧭 From XL to S: The Journey Back to Myself In school, I was a sprinter - fast enough to finish 100 meters in 11 seconds. In college, I was a great…
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Today Raj Shekhar Singh and I had the privilege of meeting Rajat Gupta, a visionary leader whose impact has resonated deeply in my life and career…
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I met one of my Childhood Heroes today .. today Rajat Gupta might invoke mixed feelings from many people for his insider trading conviction (and he…
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We recently hosted an inspiring z21 Ventures Community Event, bringing together an incredible group of founders, LPs, and community members. The…
We recently hosted an inspiring z21 Ventures Community Event, bringing together an incredible group of founders, LPs, and community members. The…
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Thanks for coming and sharing insights 🚀🚀
Thanks for coming and sharing insights 🚀🚀
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