A5014363946- Seismic Waves and Analysis
- Groundwater flow and contamination studies
- Seismic Imaging and Inversion Techniques
- Hydrology and Watershed Management Studies
- Geophysical and Geoelectrical Methods
- Geochemistry and Geologic Mapping
- Atmospheric and Environmental Gas Dynamics
- Hydrocarbon exploration and reservoir analysis
- Remote Sensing in Agriculture
- Electrochemical Analysis and Applications
- Remote Sensing and LiDAR Applications
- Groundwater and Isotope Geochemistry
- Plant Water Relations and Carbon Dynamics
- earthquake and tectonic studies
- Cell Image Analysis Techniques
- CO2 Sequestration and Geologic Interactions
- Species Distribution and Climate Change
- Soil and Water Nutrient Dynamics
- Image Retrieval and Classification Techniques
- AI in cancer detection
- Water Quality and Pollution Assessment
- Metal Extraction and Bioleaching
- Seismology and Earthquake Studies
- Geophysical Methods and Applications
- Soil Geostatistics and Mapping
Pennsylvania State University
2017-2024
Abstract Complex subsurface flow dynamics impact the storage, routing, and transport of water solutes to streams in headwater catchments. Many these hydrogeologic processes are indirectly reflected observations stream chemistry responses rain events, also known as concentration‐discharge (CQ) relations. Identifying relative importance flows CQ relationships is often challenging environments due spatial temporal variability. Therefore, this study combines a diverse set methods, including...
Core Ideas Studying the critical zone requires targeted research on water, energy, gas, solutes, and sediments. The SSHCZO targets a 165‐km 2 watershed sedimentary rocks in northeastern United States. One subcatchment, Shale Hills, provides extraordinary data describing shale CZ. Susquehanna Hills Critical Zone Observatory (SSHCZO) was established to investigate form, function, dynamics of developed Appalachian Mountains central Pennsylvania. When first established, encompassed only...
Abstract Understanding streamflow generation and its dependence on catchment characteristics requires large spatial data sets is often limited by convoluted effects of multiple variables. Here we address this knowledge gap using data‐informed, physics‐based hydrologic modeling in two catchments with similar vegetation climate but different lithology (Shale Hills [SH], shale, 0.08 km 2 , Garner Run [GR], sandstone, 1.34 ), which influences topography soil properties. The sandstone catchment,...
Abstract The critical zone sustains terrestrial life, but we have few tools to explore it efficiently beyond the first meters of subsurface. Using analyses high‐frequency ambient seismic noise from densely spaced seismometers deployed in forested Shale Hills subcatchment Susquehanna Critical Zone Observatory (SSHCZO), show that temporal changes velocities at depths ∼1 m tens can be detected. These are driven by variations land surface. Moving‐Window Cross‐Spectral (MWCS) method was employed...
Core Ideas Two new subcatchments are used to test the importance of lithology and land use. Differences in use result differences soils waters. Despite differences, all catchments have a shallow deep water table. The relative flow paths controls distinct chemistry response discharge. Cross‐site comparison will ultimately enable upscaling from catchment large scale. footprint Susquehanna Shale Hills Critical Zone Observatory was expanded 2013 forested subcatchment (0.08 km 2 ) most Shavers...
Abstract Predicting the partitioning between aqueous and gaseous C across landscapes is difficult because many factors interact to control carbon dioxide (CO 2 ) concentrations removal as dissolved inorganic (DIC). For example, carbonate minerals buffer soil pH allow CO dissolution in porewaters, but nitrification of fertilizers may decrease so that weathering results a efflux. Here, we investigate an agricultural, first‐order, mixed‐lithology humid, temperate watershed. We quantified...
Abstract To investigate how bedrock transforms to soil, we mapped the topography of interface demarcating onset weathering under an east‐west trending shale watershed in Valley and Ridge province USA Using wave equation travel‐time tomography from a seismic array >4,000 geophones, obtained 3D P‐wave velocity (Vp) model that resolves structures ∼20 m below land surface (mbls). The depth mobile soil dissolution chlorite roughly match Vp = 600 m/s 2,700 m/s, respectively. Chlorite initiates...
Abstract We used seismic refraction to image the P‐wave velocity structure of a shale watershed experiencing regional compression in Valley and Ridge Province (USA). From estimates showing strong compressional stress, we expected depth unweathered bedrock mirror hill‐valley‐hill topography (“bowtie pattern”) by analogy patterns crystalline North American Piedmont that also experience compression. Previous researchers failure potentials calculated for suggest fractures are open deeper under...
Abstract Oxidative weathering of pyrite plays an important role in the biogeochemical cycling Fe and S terrestrial environments. While mechanism occurrence biologically accelerated oxidation under acidic conditions are well established, much less is known about microbially mediated at circumneutral pH. Recent work (Percak‐Dennett et al., 2017, Geobiology , 15, 690) has demonstrated ability aerobic chemolithotrophic microorganisms to accelerate pH proposed two mechanistic models by which this...
Abstract Among the contributors to soil CO 2 efflux, there remains uncertainty about contribution of root activity overall efflux. Soil water and temperature frequently have been used predict a large portion variation in We hypothesized that fine‐root dynamics explain most remaining variability efflux cannot be explained by content. anticipated seasonal increases production, mortality via decomposition, standing crop would result corresponding tested our hypotheses collecting analyzing two...
Since 2013 Susquehanna Shale Hills Critical Zone Observatory (SSHCZO) has been monitoring using a Ground Hydrological Observation System (GroundHOG) design consisting of various sensor types in the Shavers Creek watershed central Pennsylvania. The GroundHOG was established to study interactions between hydrological systems (surface and groundwater), soils, ecosystems along catenas. We currently have three sites with differing land uses geology: one located pristine shale watershed, another...