

Kaweah River Watershed
Projects

Project Scientists

Dr. Juan S. Acero Triana
Dr. Acero Triana is an Assistant Project Scientist in the Department of Environmental Sciences at the University of California, Riverside. He completed his PhD in Agricultural and Biological Engineering with a concentration in Computational Science and Engineering at the University of Illinois at Urbana-Champaign (UIUC) and an MSc in Applied Hydrometeorology at the Russian State Hydrometeorological University (RSHU). Since joining UCR, Dr. Acero Triana has developed a research portfolio centered on understanding ecohydrological processes in highly managed agroecosystems and lake-watershed systems. His work integrates hydrologic models and tools (including SWAT/SWAT+, SWAT-MODFLOW, ParFlow-CLM, and EcoSLIM), machine learning, geospatial analysis, and high-performance computing to investigate groundwater-surface water interactions, mountain system recharge, irrigation-driven hydrologic dynamics, and the impacts of climate variability and land-use change.
He has led and contributed to projects in basins across California, including the Salton Sea and Kaweah River watersheds, focusing on recharge pathways, depletion mechanisms, and drivers of hydrologic change. His research also extends to improving streamflow predictions under climate change using advanced data-driven methods. Broadly, the objective of his work is to develop robust, data-informed decision-support systems that help resource managers and stakeholders assess adaptive strategies to enhance watershed ecosystem services amid environmental change.
Postdoctoral Fellows

Dr. Jason Goulding
Co-advised by Dr. Jirka Simunek, Dr. Scott Bradford, Dr. Menberu Meles
Dr. Goulding is a postdoctoral researcher at the University of California, Riverside. He earned his Ph.D. in Computer Science at UCR with a research focus on multiphase fluid simulations. He joined the Department of Environmental Sciences in 2025, working with Dr. Hoori Ajami, Dr. Jirka Šimunek, and researchers from the USDA Sustainable Agricultural Water Systems Research team. His current focus is on helping the team improve their integrated watershed simulation method that couples the Hydrus, Kineros and MODFLOW programs.

Dr. Jui-Hsiang Lo
Dr. Lo is a postdoctoral researcher at the University of California, Riverside. His current research focuses on how root-zone salinity affects transpiration and crop water use in irrigated agriculture, with the goal of improving irrigation and salinity management. He joined the group in 2026 after completing his PhD in Civil and Environmental Engineering at Colorado State University. During his PhD, he studied subsurface flow and contaminant transport, including natural gas migration and remediation in the vadose zone and PFAS transport and back diffusion in groundwater, using COMSOL Multiphysics.

Dr. Taylor M. McDowell
Co-advised by Dr. Daniel Hirmas
Dr. McDowell completed her PhD at the University of Wisconsin-Madison with a focus on soil hydrology in semi-arid aeolian landscapes. In 2024, she started as postdoctoral researcher at Texas Tech University co-advised by Drs. Hoori Ajami and Daniel Hirmas. Her postdoctoral research project focuses on describing urban soils and their hydraulic properties in the LA area to better understand their role in an urban watershed. Ultimately, we hope this knowledge will contribute to the implementation of nature-based solutions with the goal of reducing stormwater runoff and flooding.
Graduate Students

Vaishnavi Varikuti
Co-advised by Dr. Daniel Hirmas
I earned my BS degree in Agricultural Sciences from Acharya N.G. Ranga Agricultural University, India. After graduation, I was highly aspired to study abroad and thus joined South Dakota State University, Brookings to get my MS degree in Plant Sciences. As a PhD student at Texas Tech University under the supervision of Drs. Daniel Hirmas and Hoori Ajami, my research is focused on understanding the effects of interactions between roots, soil, and bedrock on the evolution of soil hydraulic properties, distribution of soil chemical and physical properties, and hydrological functioning of the critical zone.

Eric Wineteer
As an Environmental Sciences PhD student at UC Riverside, I use remotely sensed data to constrain hydrologic models and better understand groundwater recharge. In my previous position as a consulting engineer, I developed improved statistical downscaling techniques to predict the impact of climate change on water quality, and its implications for infrastructure planning. I have extensive experience in high performance computing, particularly in parallel programming with Python. I recived my B.S. in Civil Engineering and my M.S. in Environmental Engineering from the Northeastern University.
Alumni

Dr. Bing Li
Postdoctoral Fellow (2025-2026) - Co-advised by Dr. Daniel Hirmas

Dr. Xinying Ling
Postdoctoral Fellow (2023-2025) - Co-advised by Dr. Scott Bradford and Dr. Menberu Meles
Now: Postdoctoral Fellow, Texas Tech University

Dr. Sakiur Rahman
Postdoctoral Fellow (2023-2025) - Co-advised by Dr. Jirka Simunek and Dr. Scott Bradford
Now: Postdoctoral Fellow, University of Florida

Dr. Srishti Gaur
Postdoctoral Fellow (2024-2025)

Dr. Adam Schreiner- McGraw
Postdoctoral Fellow (2018-2021)
Now: Research Hydrologist, USDA ARS Missouri

Dr. Sanghyun Lee
Postdoctoral Fellow (2022)
Now: Assistant Professor, Jeonbuk National University

Dr. Matthew Amato
Postdoctoral Fellow (2023-2024) - Co-advised by Dr. Daniel Hirmas
Now: Water Resource Scientist, Delaware River Basin Commission
Visiting Scholar, University of California Riverside

Dr. Lin Chen
Postdoctoral Fellow (2021-2024) - Co-advised by Dr. Jirka Simunek and Dr. Scott Bradford
Now: Professor at Northwest Institute of Eco-Environment and Resources, China

Dr. Sandra Armengol Vall
Postdoctoral Fellow (2021-2023)
Now: Research Scientist at Cartographic and Geological Institute of Catalonia, Spain

Dr. Julio César Pachón Maldonado
Postdoctoral Fellow (2022-2023) -Co-advised by Dr. Daniel Hirmas
Now: Postdoctoral Fellow, University of Sydney, Australia

Dr. Yusen Yuan
Postdoctoral Fellow (2022-2023)
Now: Postdoctoral Fellow, New Mexico State University

Alyssa Duro
MS student (2020-2023) - Co-advised by Dr. Daniel Hirmas
Thesis title: Topographic Correction of Proximally-Sensed Visible Near-Infrared Reflectance Spectra for High Resolution Soil Organic Carbon Mapping

Kiarash Ehsani
MS in Environmental Sciences (2019-2020)
​
​

Aarushi Jha
​
MS in Environmental Sciences (2018-2020)
Thesis Title: Application of a Semi-Distributed Hydrologic Model to Understand Hydrologic Flux Partitioning of an Arid, Highly Managed Watershed

Jacob Palmer
​
M.Eng in Chemical and Environmental Engineering
Now: PhD Student at Texas State University, San Marco

Lily Caplon-Guin
BS in Bioengineering, Digital Agricultural and NSF Fellow (2023-2026)

Refugio Zepeda
BS in Data Science, Digital Agricultural Fellow (2025-2026)

Shwetha Anand
BS in Statistics, Digital Agricultural Fellow (2025)

Hailey Glamore-Scott
BS in Computer Engineering, Digital Agricultural Fellow (2024-2025)

Valerie Gonzales
BS in Environmental Sciences, Digital Agriculture Fellow (2022-2024), Lab Assistant (2025)

Daniel Hernandez
BS in Computer Science, Digital Agricultural Fellow (2024)

Jose Angel Pulido
BS in Electrical Engineering, Digital Agricultural Fellow (2023-2024), Lab Assistant (2025)

Clarissa Carretta
BS in Geology, Junior Specialist (2022)

William Scott Burgess
​
BS in Mathematics, Digital Agricultural Fellow (2021-2022)

Maxim Shapovalov
​
BS in Earth & Planetary Sciences (2021-2022)
Now: MS student, University of Oregon
​
​

Dr. Conrad Wasko
Visiting scholar, University of Melbourne

Dr. Clare Stephens
Visiting scholar, University of New South Wales
-
Jacob Stephens (2026): (UCR, Environmental Sciences)
​
-
Edwin Gonzales (2026): (UCR, Computer Science, Digital Agriculture Fellow)
-
Jacob Padilla (2026): (UCR, Environmental Engineering, Digital Agriculture Fellow)
​
-
Kelly Perez (2019): (UCR, undergraduate researcher, groundwater monitoring)
​​
-
Carly Pierce (2018): (UCR, undergraduate researcher, Land cover change)
​
-
Mohamed Eissa (2017): (UCR, undergraduate researcher, Semi-distributed modeling)
​
-
Kyle Fructuoso (2017): (UCR, undergraduate researcher, Seawater intrusion)
​
-
Austin Fimbres (2017): (UCR, undergraduate researcher, Stream flow analysis)
​
-
Huihai Wang (2017): (UCR, undergraduate researcher, Hydrologic modeling)