A5079359496- Hydrology and Watershed Management Studies
- Coastal wetland ecosystem dynamics
- Soil and Water Nutrient Dynamics
- Hydrology and Sediment Transport Processes
- Peatlands and Wetlands Ecology
- Groundwater flow and contamination studies
- Flood Risk Assessment and Management
- Groundwater and Isotope Geochemistry
- Fish Ecology and Management Studies
- Water Quality and Resources Studies
- Environmental Conservation and Management
- Soil erosion and sediment transport
- Land Use and Ecosystem Services
- Coastal and Marine Dynamics
- Ecology and biodiversity studies
- Environmental Changes in China
- Groundwater and Watershed Analysis
- Soil and Unsaturated Flow
- Archaeology and Natural History
- Wildlife-Road Interactions and Conservation
- Geology and Paleoclimatology Research
- American Environmental and Regional History
- Botany and Plant Ecology Studies
- Economic and Environmental Valuation
- Indigenous Studies and Ecology
University of South Florida
2016-2025
Florida Department of Environmental Protection
2023
Florida College
2021
Murphy Oil Corporation (United States)
2008
Hydrologic Research Center
2000-2004
University of California, Davis
2000-2004
Weatherford College
2002
Geographically isolated wetlands (GIWs), those surrounded by uplands, exchange materials, energy, and organisms with other elements in hydrological habitat networks, contributing to landscape functions, such as flow generation, nutrient sediment retention, biodiversity support. GIWs constitute most of the many North American landscapes, provide a disproportionately large fraction wetland edges where functions are enhanced, form complexes water bodies create spatial temporal heterogeneity...
Abstract: In January 2001, the U.S. Supreme Court ruled that Army Corps of Engineers exceeded its statutory authority by asserting Clean Water Act (CWA) jurisdiction over non‐navigable, isolated, intrastate waters based solely on their use migratory birds. The Court’s majority opinion addressed broader issues CWA implying intended some “connection” to navigability and isolated need a “significant nexus” navigable be jurisdictional. Subsequent this decision ( SWANCC ), there have been many...
Since the US Supreme Court's 2001 SWANCC case (531 159), there has been significant focus on whether Clean Water Act (CWA) protections should be extended to so-called geographically isolated wetlands (GIWs); that are surrounded by uplands and lack readily apparent surface water connections downgradient waters (Downing et al., 2003; Leibowitz Nadeau, Tiner, 2003a, 2003b; see Mushet al. (2015) for a history critique of this term). Following 2006 Rapanos (547 715), interest in GIWs increased,...
We explore the category "geographically isolated wetlands" (GIWs; i.e., wetlands completely surrounded by uplands at local scale) as used in wetland sciences. As currently used, GIW (1) hampers scientific efforts obscuring important hydrological and ecological differences among multiple functional types, (2) aggregates a manner not reflective of regulatory management information needs, (3) implies so described are some way "isolated," an often incorrect implication, (4) is inconsistent with...
Watershed resilience is the ability of a watershed to maintain its characteristic system state while concurrently resisting, adapting to, and reorganizing after hydrological (for example, drought, flooding) or biogeochemical excessive nutrient) disturbances. Vulnerable waters include non-floodplain wetlands headwater streams, abundant components representing most distal extent freshwater aquatic network. are hydrologically dynamic biogeochemically reactive systems, storing, processing,...
Wetland hydrologic connections to downstream waters influence stream water quality. However, no systematic approach for characterizing this connectivity exists. Here using physical principles, we categorized conterminous US freshwater wetlands into four classes based on contact and flowpath depth the nearest stream: riparian, non-riparian shallow, mid-depth deep. These were heterogeneously distributed over United States; example, riparian dominated south-eastern Gulf coasts, while deep Upper...
Algal blooms (ABs), often exacerbated by excess nutrients from anthropogenic activities, can pose serious risks to public health, fisheries, and ecosystem structure functions. Lake Okeechobee is located in southcentral Florida (USA), with a surface area of 1730 km2, it the largest subtropical lake United States. This shallow, nutrient-rich, subject frequent intense cyanobacteria, some which are toxic. In this study, three-dimensional (3D) model was developed, coupling long-term monitoring...
Relatively little is known about the role of perched aquifers in hydrological, biogeochemical, and biological processes vernal pool landscapes. The objectives this study are to introduce a aquifer concept for formation maintenance examine resulting hydrological biogeochemical phenomena representative catchment with three pools connected one another seasonal stream by swales. A combined hydrometric geochemical approach was used. Annual rainfall infiltrated but on claypan/duripan, groundwater...
Abstract Stream restoration efforts, particularly within meadow systems, increasingly rely on ‘pond and plug’ type methods in which (a) alluvial materials are excavated from the floodplain, forming ponds; (b) used to plug incised channels (c) smaller dimension restored floodplain surface. A commonly stated objective of these efforts is restore ecologically significant hydrological processes degraded riparian systems. However, little research has been conducted evaluate quantify processes....
EPA) and Army Corps of Engineers (hereafter, "the agencies") have issued a proposed rule (1) that would remove Clean Water Act (CWA) protections from more than half wetlands one-fifth streams in the United States (2).This move sharply contrasts with reports indicating US waters remain threatened by storms, droughts, contaminants, algal blooms, other stressors.Even EPA's National Quality Inventory detected poor conditions 46% stream river miles 32% (3).In short, does not reflect...
The objectives of this study were to develop and use a linked groundwater vegetation model simulate distributions in riverine reservoir-fringe system under different reservoir operations scenarios. This was conducted where Little Stony Creek flows into East Park Reservoir on the east front Coast Range, northern California. A numerical used mean depth during growing season for water years 1980–1999 each five community types identified site. Multiple models developed, which described...
Meadow restoration efforts typically involve the modification of stream channels to re-establish hydrologic conditions necessary for maintenance native vegetation. To predict change in distribution common meadow plant species response restoration, a model was loosely coupled suite individual models. The approach tested on well-documented meadow/stream project Bear Creek, tributary Fall River northeastern California, U.S.A. We developed surface-water and groundwater meadow. Vegetation...
The floodplain shifting habitat mosaic concept suggests that patch dynamics are influenced by hydrologic disturbances driven flood pulses of sufficient power to initiate incipient motion the substratum and maintain cut-and-fill alluviation channel banks. However, mosaics subject other important landscape-scale disturbance regimes. In Rocky Mountains USA Canada, fire also affects composition. exists at intersection regimes shape riverscape those landscape. We extended examining effects...
Abstract Hydrological connectivity describes the water‐mediated transfer of mass, energy, and organisms between landscape elements is foundation for understanding how individual such as wetlands streams integrate to support ecosystem services nature‐based solutions in landscape. geographically isolated (GIWs)—that is, without persistent surface water connections—is particularly poorly understood. To better understand GIW hydrological connectivity, we use a novel chloride mass‐balance...
Research into processes governing the hydrologic connectivity of depressional wetlands has advanced rapidly in recent years. Nevertheless, a need persists for broadly applicable, non-site-specific guidance to facilitate further research. Here, we explicitly use landscapes theoretical framework develop applicable conceptual knowledge depressional-wetland connectivity. We used numerical model simulate groundwater flow through five generic landscapes. Next, inserted and repeated modeling...
A recent rule is inconsistent with science and will compromise the integrity of U.S. waters.
ABSTRACT Urbanization, driven by population growth, alters watershed hydrology and nutrient runoff. However, the complex interplay between urbanization nutrients in regional watersheds remains an open question. This study assessed how affects streamflow, total nitrogen (TN), phosphorus (TP) loads six diverse Florida covering area of 10,600 km 2 . was carried out introducing 2070 land use/land cover (LULC) projections to a hydrology/water quality model. We investigated different levels urban...