About

David F. Boutt is a professor in the Department of Earth, Geographic, and Climate Sciences at the University of Massachusetts Amherst. He serves as the program head for the 1-year Hydrogeology (MS) Program, co-director of the Environmental Science Program, and major coordinator for the department's hydrogeology, watershed hydrology, and groundwater recharge/discharge initiatives. His research focuses on the subsurface part of the hydrologic cycle, emphasizing how water becomes groundwater and the sub-surface processes that influence this transformation along its journey. He investigates groundwater's contribution to streamflow generation and springs, as well as assessing regional water availability at specific points in geologic history and identifying the sources of this water. Dr. Boutt's work has a global scope, with research conducted in locations such as Japan, Tobago, the Great Basin of the western United States, and the Atacama Desert in northern Chile, where he studies lithium brines. He holds a PhD from the New Mexico Institute of Mining and Technology, earned in 2004.

Research topics

• Geology
• Geochemistry
• Environmental science
• Oceanography
• Paleontology
• Chemistry
• Geotechnical engineering
• Water resource management
• Ecology
• Mineralogy
• Environmental engineering
• Earth science
• Geomorphology

Selected publications

• Supplementary material to "Fault and fracture networks as long-lived conduits for lithium transport"

  2026-04-01

  article
  PublisherDOI

• Streamflow generation and wetland sustenance in the High and Dry Andes: The role of permafrost and high elevation cryosphere moisture sources

  2026-03-13

  articleOpen access1st authorCorresponding

  The Dry Andes of South America (Argentina, Bolivia, Chile) is characterized by high elevation, endorheic basins with precipitation amounts less than ~300 mm/yr and regional wide averages of ~100 mm/yr. These low precipitation amounts prevent high elevation peaks (~6000 meters) from development of ice-glaciers and permanent snow fields. Permafrost, isolated rock glaciers, and some snow does accumulate during summer periods when moisture flow from the Amazon basin occurs. Therefore, downstream waters and wetlands are of small extent and extremely localized to regions with ample recharge and seasonal precipitation. Significant water pressure on the region is now occurring due to mineral extraction with broad regional exploration and development of groundwater resources that are not well understood or characterized. Generally, there is a regional wide lack of precipitation gauge stations and streamflow and groundwater level monitoring network which has led to significant uncertainty in water availability, occurrence, and impacts associated with water extraction and climate change. In a highly instrumented watershed with elevations ranging from 3700 to 6000 masl we have documented a strong correlation between perennial stream baseflow and the percentage of upgradient contributing areas with elevation above 5000 meters. Additionally, local and regional analyses of tritium in water samples show that streamflow and groundwater are dominated by old (tritium-dead) waters – but remain flowing year round. Stable isotopic composition is depleted in heavy isotopes consistent with high elevation or cold moisture sources. Although, lack of high-elevation precipitation samples prevent a direct comparison to those water isotopic compositions. Waters are old implying significant delay from input to output that could be due to storage in aquifers or perhaps storage in high elevation cryospheric water (permafrost and snow fields). Long-term changes in water yield from these catchments are hard to document but regional change suggest a trend towards lower yields perhaps associated with climate related warming. Our results suggest the importance of high elevation precipitation and storage. Warming and loss of surface storage mechanisms have the potential to impact water yield in this region with no significant surface ice.

  PublisherDOI

• Shifting Hydrologic Pathways in Temperate Forest Headwaters Under a Changing Climate

  Hydrological Processes · 2026-04-01

  article

  ABSTRACT Shifts in climate are fundamentally altering hydrologic processes in temperate forested headwater catchments, which serve as sensitive indicators of ecosystem‐scale water balance. In the Northeastern United States, rising temperatures and increases in both total and extreme precipitation have been observed over recent decades. While these changes have been linked to altered soil moisture dynamics and evapotranspiration regimes at sites like Harvard Forest, the role of groundwater and its connection to streamflow generation remains underexplored. We use regression analysis and interaction models to evaluate shifts in streamflow generation processes in headwater catchments. Following a climatic shift in 2016 that was magnified by a prolonged drought, we observed a decrease in average streamflow response time, indicating more rapid water movement through these systems. Our findings suggest a transition toward more shallow‐dominated flow paths, including intermittent shallow subsurface flow through preferential flow paths, particularly since 2016 in Massachusetts. Increasingly frequent extreme precipitation events appear to activate shallow subsurface pathways more often, resulting in faster hydrologic responses. However, we also find that wetland‐connected streams show more stability in response time and flow dynamics, acting as buffers against these rapid shifts.

  PublisherDOI

• Subsurface Temperature Distributions Constrain Groundwater Flow in Salar Marginal Environments

  Hydrology · 2026-01-15

  articleOpen access1st authorCorresponding

  Interactions between surface water and groundwater in arid regions regulate their response to climate and human impacts. In the salar systems of the Altiplano-Puna plateau (Bolivia, Chile, Argentina), understanding how surface waters connect to groundwater is crucial for accurate modeling and assessment. This study introduces new data and analysis using subsurface thermal profiles and modeling to identify flow patterns and possible surface water links. We document, to our knowledge, for the first time in the literature, deep-seated cooling of the subsurface caused by extreme evaporation rates. The subsurface is cooled by 4–5 degrees Celsius below the mean annual air temperature to depths greater than 50 m, even though groundwater inflow waters are elevated by 10 degrees °C due to geothermal heating. Three thermal zones are observed along the southern edge of Salar de Atacama, with temperature dropping from 28 °C to about 12 °C over 2.5 km. A 2D numerical model of groundwater and heat flow was developed to test various hydrological scenarios and understand the factors controlling the thermal regime. Two flow scenarios at the southern margin were examined: a diffuse flow model with uniform flow and flux to the surface and a focused flow model with preferential discharge at a topographic slope break. Results indicate that the focused flow scenario matches thermal data, with warm inflow water discharging into a transition zone between freshwater and brine, cooling through evaporation, re-infiltration, and surface flow, then re-emerging near lagoons at the halite nucleus margin. This research offers valuable insights into the groundwater hydraulics in the Salar de Atacama and can aid in monitoring environmental changes causally linked to lithium mining and upgradient freshwater extraction.

  PublisherOA PDFDOI

• From Hydraulic Heads to Dollars and Decision: It's Time to Integrate Groundwater in Coastal Risk Assessment

  Water Resources Research · 2026-04-29

  articleOpen access

  Abstract Sea level rise presents a range of hazards, including rising groundwater tables, salinization, and subsurface flooding, which threaten subsurface infrastructure in coastal communities. Groundwater shoaling inundates basements, tunnels, and utility networks, and mobilizes contaminants, while salinization accelerates corrosion and deteriorates water quality. Hydrogeologic studies increasingly assess these hazards, but few consider exposure and vulnerability to evaluate the overall risk, which is critical for adaptation planning. This commentary offers a perspective on the need to develop subsurface risk assessment tools for coastal zones by building on existing groundwater hydrology knowledge and adapting current risk analysis frameworks for coastal communities. We highlight essential data sets, infrastructure needs, and interdisciplinary collaborations required to implement these frameworks. Finally, we outline a path forward that includes (a) well‐defined, local‐scale risk analyses of specific infrastructure categories, (b) scale up through the creation of accessible, web‐based coastal groundwater observatories and shared monitoring networks, and (c) advances toward the long‐term development of digital twins that integrate real‐time sensing, satellite data, and machine learning to anticipate subsurface hazards at regional scale. All require sustained interdisciplinary collaboration among academia, government institutions, and coastal communities.

  PublisherDOI

• Fen Connectivity and Snowmelt-driven Hyporheic Dynamics Drive Carbon Dioxide Budgets in Mountain Headwaters

  2026-02-17

  article

  Rivers and streams process and transport significant quantities of terrestrial carbon into global oceans and Earth’s atmosphere annually. However, determining stream carbon sources via quantitative budgets is difficult due to complex hydrologic and biogeochemical interactions at the land-water interface. Here, we develop carbon dioxide (CO2) budgets from two mountainous headwater streams in the East River watershed: one flowing through a high-elevation fen and one flowing through an alpine meadow. We performed three resazurin, chloride, and argon tracer release experiments, targeting comparisons between snowmelt and baseflow dynamics at one site as well as inter-site variability during baseflow. We also monitored stream geochemical conditions and dissolved organic carbon (DOC) of water samples. CO2 emissions were 5.5x higher during spring snowmelt than during baseflow and 1.5x higher at the site with greater fen extent during baseflow. During snowmelt, stream-corridor CO2 production supplied 72% of evasion from the stream, likely supported by discharge-mediated increases in exchange with the microbially active hyporheic zone. Stream-corridor production was ~14x greater during snowmelt than during baseflow, whereas groundwater CO2 inputs were only ~6x greater. The stream with greater fen extent featured ~2.5x higher CO2 concentrations and ~2x higher DOC concentrations during baseflow, indicating greater accessibility to carbon sources via the fen. These results demonstrate that both the source distribution and magnitude of in-stream CO2 production are highly dynamic, even in headwater systems which are often assumed to reflect solely groundwater contributions. Further, wetland connectivity to streams may sustain carbon inputs even during low flow conditions.

  PublisherDOI

• Tracking Baseflow Supply Dynamics Using <scp>SWOT</scp> Data From Small Groundwater‐Dominated Lakes

  Hydrological Processes · 2026-02-01 · 1 citations

  articleOpen access

  ABSTRACT In situ surface‐water monitoring strategies are biased towards larger perennial streams and lakes and are generally not designed to track mechanisms of baseflow supply contributed by the dynamic storage of aquifers. Additionally, small (&lt; 1 km 2 ) groundwater‐influenced lakes and wetlands globally have little in situ monitoring infrastructure. We explored the utility of remotely sensed Surface Water Ocean Topography Satellite (SWOT) data, collected from 2023 onward, to characterise the seasonal and multi‐year water‐level trends of groundwater flow‐through kettle lakes distributed across the permeable sediments of eastern Massachusetts, USA. This analysis indicated that water levels for kettle lakes with areas down to approximately 0.05 km 2 are resolvable in the study area. Our examination of 17 kettle lakes found that SWOT water‐surface elevation data closely tracked groundwater levels in adjacent monitoring wells where available, including the timing of seasonal patterns (highest levels generally in late spring), although there was some variation between years and there was a substantial lag in the timing of high water levels for a lake located downgradient from a 30‐m‐thick vadose zone. Furthermore, SWOT‐observed water‐level increases in kettle lakes tracked with baseflow increases in two adjacent groundwater‐dominated streams, as would be expected from increased hydraulic gradients. Unlike spectral remote sensing, SWOT data are generally not affected by cloud cover, resulting in a potential for groundwater‐dominated lakes to be sentinels of dynamic storage patterns, including identification of baseflow drought lags, which are currently ill‐defined hydrological processes. SWOT monitoring of groundwater‐influenced surface waters shows potential for augmenting existing monitoring wells and streamgages as continuous monitors of groundwater levels and baseflow supply in permeable terrain.

  PublisherOA PDFDOI

• Fault and fracture networks as long-lived conduits for lithium transport

  2026-04-01

  articleOpen access

  Abstract. Lithium brine systems are critical resources for the energy transition, yet the mechanisms governing lithium mobilization, transport, and concentration remain poorly constrained. In particular, the role of fault and fracture networks in controlling fluid flow and lithium distribution is not well resolved. Here we investigate the structural controls on lithium transport in Clayton Valley, Nevada, a key lithium-producing basin in the USA. We present new analyses of calcite-mineralized faults, opening-mode fractures, and spring deposits that record lithium-bearing fluid flow over &gt;10 Myr of Basin and Range extension. Hereafter, opening-mode fractures are referred to as “fractures,” and mineral-cemented faults or fractures as “veins.” Calcite U–Pb ages (15–4 Ma), clumped-isotope formation temperatures (25–140 °C), and lithium concentrations (up to 460 ppm) demonstrate that fault and fracture networks repeatedly transported lithium-bearing fluids through basement, along basin margins, and within basin fill throughout basin evolution. Lithium concentrations vary systematically with host setting, with the highest values recorded in basin-fill-hosted veins and spring deposits and generally lower values in basement-hosted and basin-bounding fault veins. Several lithium-bearing calcite veins yield U–Pb ages that predate emplacement of late Miocene silicic volcanic units by up to ~9 Myr, demonstrating that structurally focused lithium transport occurred prior to emplacement of widely cited volcanic source reservoirs. Temperature and stable isotope constraints indicate dominantly meteoric fluids advected to depth and focused along faults, suggesting that lithium transport and enrichment in Clayton Valley does not necessarily require ascent of lithium-enriched magmatic fluids along deeply rooted crustal-scale faults. These results show that long-lived fault and fracture networks act as persistent pathways for lithium transport and redistribution within closed extensional basins. Although fault-controlled lithium enrichment has been recognized previously, this study provides direct evidence for structurally focused lithium transport over multi-Myr timescales.

  PublisherOA PDFDOI

• Review: The hydrogeology of critical mineral resources relevant to the energy transition

  Hydrogeology Journal · 2025-05-31 · 3 citations

  articleOpen access

  Abstract Attaining the goals of the international treaty on climate change (the Paris Agreement) will greatly increase the demand for the critical minerals required to implement clean-energy technologies. This poses both challenges and opportunities to the hydrogeologic community from several perspectives. Here, important insights that the hydrogeological sciences have to offer for mineral exploration, mineral production, and addressing environmental issues related to mining and mine decommissioning are summarized. This study focuses on copper, cobalt, lithium, and rare earths to represent the broad spectrum of critical minerals and illustrate their relevance by referring to projected demands and production rates. The current understanding of the hydrogeologic processes that form major deposits of these minerals are then summarized. Ore is defined as the naturally occurring material from which minerals of economic value can be extracted, where most ore deposits are the products of complex hydrogeologic couplings between fluid flow, heat transport, solute transport, chemical reactions, and mechanical deformation. Exploration models for the discovery of deeper, hidden deposits are potentially informed by hydrogeologic theory and hydrogeochemical processes. Hydrogeologic understanding and methods are also essential to production and recovery. Longstanding challenges are mine dewatering and (conversely) mine water supply, as well as mineral-extraction practices such as spoil heap leaching and in situ mining. New challenges arise from element extraction from subsurface brines. Finally, the quantity of water use and potential environmental impacts of mining on water quality are at the core of ‘social license’: the approval and acceptance of society to mining activities.

  PublisherOA PDFDOI

• Exploring the Variability of Baseflow Drought Through Diel Paired Air-Stream Temperature Analysis

  Abstracts with programs - Geological Society of America · 2025-01-01

  articleSenior author
  PublisherDOI

Recent grants

• COLLABORATIVE RESEARCH: ECOHYDROLOGY OF DEEP CRYSTALLINE ROCKS AT DUSEL HOMESTAKE

  NSF · $111k · 2009–2013

Frequent coauthors

• LeeAnn Munk

  University of Alaska Anchorage

  107 shared

• Daniel Ibarra

  Brown University

  36 shared

• Jordan Jenckes

  University of Alaska Fairbanks

  35 shared

• B. Moran

  29 shared

• Sarah McKnight

  28 shared

• Kristina L. Butler

  Brown University

  24 shared

• Mai‐Linh Doan

  Université Grenoble Alpes

  22 shared

• Catherine Gagnon

  Centre for Interdisciplinary Research in Rehabilitation

  21 shared

Labs

• Department of Earth, Geographic, and Climate SciencesPI

Education

• PhD Hydrology, Earth and Environmental Sciences

  New Mexico Institute of Mining and Technology

  2004

• M.S. Hydrogeology, Geological Sciences

  Michigan State University

  1999

• B.S., Geological Sciences

  Michigan State University

  1997