A5055660315- Hydrology and Watershed Management Studies
- Hydrology and Sediment Transport Processes
- Soil erosion and sediment transport
- Soil and Water Nutrient Dynamics
- Fish Ecology and Management Studies
- Wastewater Treatment and Nitrogen Removal
- Water resources management and optimization
- Groundwater and Isotope Geochemistry
- Groundwater flow and contamination studies
- Water Quality and Resources Studies
- Constructed Wetlands for Wastewater Treatment
- Water Quality and Pollution Assessment
- Flood Risk Assessment and Management
- Groundwater and Watershed Analysis
- Water-Energy-Food Nexus Studies
- Environmental Conservation and Management
- Environmental Toxicology and Ecotoxicology
- Hydrological Forecasting Using AI
- Sustainable Industrial Ecology
- Amphibian and Reptile Biology
- Hydraulic flow and structures
- Urban Stormwater Management Solutions
- Advanced Measurement and Metrology Techniques
- Karst Systems and Hydrogeology
- Irrigation Practices and Water Management
University of Minnesota
2013-2024
ID-FISH Technology (United States)
2022
Watershed Center
2022
Minnesota Pollution Control Agency
2000-2013
Minnesota Department of Natural Resources
2007-2010
University of Minnesota System
2009
National Institute of Environmental Health Sciences
1998-2000
Triangle
1998
PerkinElmer (United States)
1981
University of Liverpool
1969
The recent increase in the incidence of deformities among natural frog populations has raised concern about state environment and possible impact unidentified causative agents on health wildlife human populations. An open workshop Strategies for Assessing Implications Malformed Frogs Environmental Health was convened 4-5 December 1997 at National Institute Sciences Research Triangle Park, North Carolina. purpose to share information a multidisciplinary group with scientific interest...
Abstract Water quality and stream habitat in agricultural watersheds are under greater scrutiny as hydrologic pathways altered to increase crop production. Agricultural drainage ditches function remove water quickly from farmed landscapes. Conventional ditch designs lack the form of natural systems tend be unstable provide inadequate habitat. In October 2009, 1.89 km a conventional Mower County, Minnesota, was converted an alternative system with two‐stage channel investigate improvements...
Abstract Carbonate‐sandstone geology in southeastern M innesota creates a heterogeneous landscape of springs, seeps, and sinkholes that supply groundwater into streams. Air temperatures are effective predictors water temperature surface‐water dominated However, no published work investigates the relationship between air groundwater‐fed streams (GWFS) across watersheds. We used simple linear regressions to examine weekly air‐water relationships for 40 GWFS innesota. A 40‐stream, composite...
Water samples from several ponds in Minnesota were evaluated for their capacity to induce malformations embryos of Xenopus laevis. The FETAX assay was used assess the occurrence following a 96-hr period exposure water samples. These studies conducted reports high incidences malformation natural populations frogs wetlands. purpose these determine if biologically active agent(s) present waters and could be detected using assay. with frog (affected sites), along unaffected (reference studied....
Abstract Water quality and stream habitat in agricultural watersheds are under greater scrutiny as hydrologic pathways altered to increase crop production. Ditches have been traditionally constructed remove water from lands. Little attention has placed on alternative ditch designs that more stable provide diversity for wildlife aquatic species. In 2009, 1.89 km of a conventional drainage Mower County, Minnesota, was converted two‐stage (TSD) with small, adjacent floodplains mimic natural...
O n August 2, 2014, the residents of Toledo, Ohio, were warned that their drinking water was potentially contaminated with microcystin, an algal-related toxin can cause various illnesses and liver damage, unsafe to drink (Bullerjahn et al. 2016). They latest victims a series quality crises in United States, many (including Toledo event) attributable large part nutrients lost from agricultural landscapes. Meanwhile, hypoxia Gulf Mexico continues unabated (USEPA 2015), 2017 dead zone being...
ABSTRACT Changes in land use and drainage have contributed to channel adjustment small‐order medium‐order streams the prairie pothole region of south‐west Minnesota. Although conversion from agriculture occurred a century ago, recent decades seen increased subsurface tile drainage, annual row crop coverage modifications, particularly at road crossings such that is ongoing. Channel evolution Elm Center Creeks, two fourth‐order Blue Earth River basin, was studied understand relationships...
Hydrologic flow paths were assessed and stream water quality was monitored in two adjacent watersheds to improve the understanding of how impact nitrate nitrogen total phosphorus ratios (NO 3 :TP). We hypothesized that a watershed with mostly subsurface will have high NO :TP relative greater tendency overland paths. Flow end member mixing analysis (EMMA), temperature, discharge flashiness. The EMMA suggested groundwater comprised larger percentage west compared east stream. temperature...
This study evaluates processes that affect nitrate concentrations in groundwater beneath riparian zones an agricultural watershed. Nitrate pathways the upper 2 m of were investigated wooded and grass‐shrub next to cultivated fields. Because trees can be important components overall pathway zones, water sources used by possible effects on also investigated. Average shallow fields 5.5 mg/L upgradient zone 3.5 zone. Shallow passed through discharged into streams had average 8.5 (as N). Lateral...