Andrew John Stumpf

University of Illinois, Urbana-Champaign | UIUC · Illinois State Geological Survey/Prairie Research Institute

Three-dimensional (3-D) hydrostratigraphic modelling of glacial sediment assemblages was undertaken as part of a groundwater study in central Illinois, USA. Sediments comprising these assemblages, informally referred to as the Glasford deglacial unit, form discontinuous sand-gravel layers including small aquifer zones, and fine-grained interstratif...

McClenagan (2013) presents a model to explain streamlined erosional residuals or drumlins on uplands and lowlands in the plateau region of central British Columbia, Canada. In this discussion paper, we note that McClenagan (2013) has not adequately discussed previous relevant work in the region, and we argue that additional analyses and evidence ar...

The vertical distribution of compressional wave velocity (Vp) and shear wave velocity (Vs) acquired from fifteen boreholes in central Illinois using the standard surface-source downhole-receiver method was studied. The velocity logs were compared with lithologic logs and gamma-ray logs acquired from the same boreholes to: 1) better understand the V...

High-resolution seismic reflection (HRSR) data acquired over the Pesotum Bedrock Valley in central Illinois, USA, helped construct the seismic stratigraphy of a valley fill and the overlying sediments. Integrating these data with drilling and borehole geophysics allowed us to develop a seismo-stratigraphic classification for sediments on undulating...

In central British Columbia, ice flow during the late Wisconsinan Fraser glaciation (ca. 25-10 ka) occurred in three phases. The ice expansion phase occurred during an extended period when glaciers flowed westward to the Pacific Ocean and east-southeastward onto the Nechako Plateau from ice centers in the Skeena, Hazelton, Coast, and Omineca Mounta...

Keywords: urban geothermal, UTES, direct-use heating and cooling, energy resilience, geothermal heating and cooling ABS TRACT Cities have important and varying incentives to transform their energy sector to all-electric with low carbon emissions. However, they often encounter a number of impediments when attempting to implement such a change. For e...

Despite the intensive studies and advances have been made, the penetration of geothermal heat exchangers (GHEs) and ground coupled heat pump (GCHP) systems has been constrained due to high-upfront capital cost. On the other hand, the recent research has revealed the enormous influence that complex geologic and hydraulic systems have on the GCHP eff...

A thorough assessment of thermal properties in heterogeneous subsurface is necessary in design of low‐temperature borehole heat exchangers (BHEs). A distributed thermal response test (DTRT), which combines distributed temperature sensing (DTS) with a conventional thermal response test (TRT), was conducted in a U‐bend geothermal loop installed in an...

This chapter focuses on layer‐based modeling of the subsurface, which aims at a geometrically consistent, three‐dimensional representation of various types of stratigraphic surfaces. The models contain structural or tectonic features appropriate to the user requirements and mapping objectives. Geologists initially undertook 3‐D modeling to represen...

This paper focuses on experimental investigation of the effect of temperature on coupled thermo-hydraulic properties of glacial tills. During operation of a geothermal system, geomaterials are subjected to thermal gradients that may significantly affect the hydraulic properties. An accurate characterization of these properties under representative...

State Geological Surveys (SGSs) in the USA play vitally important roles, providing sound, unbiased scientific information to each state and the nation. Although implementation of each survey's scientific programme has evolved differently, these organizations are often the principal drivers of economic development, and they consult on policies for p...

Core Ideas IML‐CZO is structured to study system responses through event‐based monitoring. Management legacy has shaped critical zone processes. Management and weather affect landscape heterogeneity and surface–subsurface pathways. In intensively managed landscapes, interactions between surface (tillage) and subsurface (tile drainage) management w...

A fiber optic distributed thermal response test (DTRT) conducted in well-documented heterogeneous geology is combined with laboratory thermophysical measurements of cores and novel data analysis techniques to provide a detailed description of variability in subsurface heat transfer. The results of this study show that appreciable variation in subsu...

Watersheds are complex systems due to their surface and subsurface spatially connected water fluxes and biochemical processes that shape Earth´s critical zone. In intensively managed landscapes, the implementation of Watershed Management Practices (WMPs) regulate their short‐term responses while climate variability controls the long‐term processes....

We applied the high temperature pyrolysis-combustion technique to partition the total soil organic carbon (SOC) into labile and inert carbon pools for accelerator mass spectrometry radiocarbon (AMS ¹⁴ C) dating and stable carbon isotope (δ ¹³ C), SOC, and carbonate carbon (CC) content analyses to examine SOC variability at a Critical Zone Observato...

Expansion and intensification of managed landscapes for agriculture have resulted in severe unintended global impacts, including degradation of arable land and eutrophication of receiving water bodies. Modern agricultural practices rely on significant direct and indirect human energy inputs through farm machinery and chemical use, respectively, whi...

The concept of a critical zone (CZ) supporting terrestrial life has fostered groundbreaking interdisciplinary science addressing complex interactions among water, soil, rock, air, and life near Earth's surface. Pioneering work has focused on the CZ in areas with residual soils and steady-state or erosional topography. CZ evolution in these areas is...

Intensively managed land increases the rate of nutrient and particle transport within a basin, but the impact of these changes on microbial community assembly patterns at the basin scale is not yet understood. The objective of this study was to investigate how landscape connectivity and dispersal impacts microbial diversity in an agricultural-domin...

Floodplains and terraces in river valleys play important roles in the transport dynamics of water and sediment. While flat areas in river valleys can be identified from LiDAR data, directly characterizing them as either floodplain or terraces isnot yet possible. To address this challenge, we hypothesize that since geomorphic features are strongly c...

This project involved the construction of a surficial (Quaternary) geologic map of part of McLean County, Illinois. The Saybrook 7.5-minute Quadrangle (scale 1:24,000) was the focus area. The quadrangle largely covers rural agricultural land, but also contains the small town of Saybrook. Multiple, major episodes of glaciation over the past 1,200,00...

The last Northern Hemisphere ice sheet margins retreated in the late phase of the Last Glacial Maximum, peaked at 19 thousand calibrated years ago (ka) in response to large-scale changes in all components of the climate system. This recession is presumably to have weakened the Atlantic meridional overturning circulation via freshwater input trigger...

Vertical heat conduction in the subsurface is typically delineated by the conventional heat conduction equation, which incorporates records of surface temperature and thermal properties of the soil and subsoil. However, a new field experiment using a fiber-optic distributed temperature sensing (FO-DTS) system in a 100-m borehole returned a differen...

The glaciated landscape of much of Illinois is a product of the most recent glacial episode, which is characterized by a series of end moraines composed predominantly of till and deposited by ice flowing into Illinois from the east and northeast around 20,000 years before present time. To better understand till provenance and sediment recycling in...

Outcrop mapping by close-range photogrammetry was undertaken at three remote sites as part of a study of water resources to improve characterization of glacial sedimentary assemblages and to evaluate the utility of terrestrial remote sensing to supplement routine geologic mapping. Two features were measured from georeferenced stereomodels, clast pa...

The study of dispersive soil has a long history, and a worldwide effort has been undertaken to identify and characterize them through rigorous testing, in order to develop a comprehensive classification scheme. Ancillary research has utilized this data to develop products (i.e., filters and chemical additives) used to mitigate their affect on agric...

The large number of studies undertaken worldwide to identify and predict the distribution of collapsing soil suggests that their presence in geologic and man-made materials is more common than originally presumed (this point is set forth in Derbyshire et al., 1995). There has been much debate between the soil scientists, geologists, geomorphologist...

Reconstructing moisture conditions during the early retreat of the Laurentide Ice Sheet (LIS) may help define the phase relationship of deglacial conditions and atmospheric changes over North America. Here, we report two sediment successions near the concurrent ice margins in the Midwest of the U.S.A. to show that dune formation was active from 17....

High-resolution shallow seismic methods are the most widely used geophysical methods in near surface characterization. However, in many cases interpreting the seismic images can be misleading. In this article, we present three case studies where results from P-wave seismic reflection, SH-wave seismic reflection, and multi-channel analysis of surfac...

Seismic shear wave velocity profiles were acquired from 10 boreholes in central Illinois and compared to shear wave velocity profiles generated from the multichannel analysis of surface wave (MASW) data acquired at the borehole locations. The main objective was to determine if the shear wave velocity measurements from the MASW are reliable and can...

From 18,000 to 15,000 years (ka) ago, during the broad Heinrich Stadial 1 interval, the Laurentide ice sheet (LIS) began its largest retreat in North America. However, climatic conditions near ice margins during this recession are poorly understood due to a lack of studies focusing on paleoenvironmental proxies in corresponding sedimentary records....

The importance of understanding the character and distribution of deposits correlated to the Illinoian deglaciation in east-central Illinois lies in the potential for related events to have locally incised important aquitard materials that provide protection to shallow groundwater resources. However, the nature and mode of this incision into the Il...

Groundwater Cascading (GC) is a specific type of thermohaline circulation, in which dense water formed over the continental shelf descends down the continental slope to a greater depth. This process is a major component of ventilation of intermediate and abyssal waters, hence affecting thermohaline circulation and global climate. The resulting flow...

One prominent event associated with retreat of the Laurentide Ice Sheet was the release of an exceptionally large volume of meltwater from Lake Agassiz. This discharge led to a sea-level rise of 20 meters in about 500 years and caused disruption to the global thermohaline circulation that led to an overall cooling during the Younger Dryas stadial (...

Despite the reliable performance of high resolution seismic methods for imaging the shallow subsurface, in some cases interpreting seismic results can be misleading. We present three case studies where results from, P‐wave reflection, SH‐wave reflection, and MASW surveys were incorrectly interpreted because of inadequate constrains on either the su...

Please click here to download the map associated with this article.Geological mapping projects undertaken in the Chicago metropolitan areas of northeastern Illinois are providing critical scientific information requested by government officials and public agencies to direct future land use, groundwater extraction, and environmental mitigation. Spec...

A depositional framework for late Pleistocene sediments in central British Columbia was developed from the composite stratigraphy of glacial sediments found in the Bulkley River region. Nonglacial deposits correlated to the Olympia Nonglacial Interval, are overlain in succession by sub-till, ice-advance sediments, Late Wisconsinan (Fraser Glaciatio...

The failure potential of glaciolacustrine sediments in British Columbia is dependant upon their grain size characteristics and clay mineralogy, the local and regional bedrock geology, exposure along slopes, and the type of glacial system in ehich they were deposited. Sediments in the Smithers-Houston areahave similar geotechnical properties to Nort...

Analyses of dispersal patterns for till clasts and matrix geochemistry in the McAdam area, southwestern New Brunswick, are used to define the dominant glacial transport direction in an area of ice-flow complexity, as indicated by multiple and differing striae directions. Dispersal and erosional data indicate that the main (regional) southeastward f...

KEYWORLX: Applied geochemistry, ice-flow history, glaciation, mineral exploration, surficial geology, Quaternary stxatigraphy

Detailed geologic mapping was undertaken in northeastern Illinois to provide officials at state, county, and local agencies a better understanding of Quaternary deposits for environmental, resource, and planning issues. The regional geological framework was developed from mapping in the Wauconda and Grayslake Quadrangles for the National Cooperativ...

We conducted geologic mapping within the suburban area northwest of Chicago, in the Wauconda 7.5-minute Quadrangle, so that state and local officials could identify important groundwater resources in a rapidly protect them. Previously, little was known about the succession of glacial drift aquifers in the subsurface. of this region has increased ra...

Introduction. To prepare for a highway improvement project, the Illinois Department of Transportation (IDOT) contracted with the Illinois State Geological Survey (ISGS) to conduct a 15-month, three-dimensional (3-D) geological mapping program along a 24-mile (39 km) segment of Illinois Route 29 in central-northern Illinois from just north of Chilli...