A5038632680- Plant Water Relations and Carbon Dynamics
- Hydrology and Sediment Transport Processes
- Hydrology and Watershed Management Studies
- Soil erosion and sediment transport
- Tree-ring climate responses
- Coastal wetland ecosystem dynamics
- Peatlands and Wetlands Ecology
- Forest ecology and management
- Landslides and related hazards
- Plant Pathogens and Fungal Diseases
- Cryospheric studies and observations
- Ecology and Vegetation Dynamics Studies
- Botany, Ecology, and Taxonomy Studies
- Geology and Paleoclimatology Research
- Soil and Water Nutrient Dynamics
- Groundwater flow and contamination studies
- Remote Sensing in Agriculture
- Archaeology and Natural History
- Hydrology and Drought Analysis
- Soil and Unsaturated Flow
- Forest Ecology and Biodiversity Studies
- Tree Root and Stability Studies
- Plant responses to water stress
- Water Quality and Resources Studies
- Flood Risk Assessment and Management
Louisiana State University
2016-2025
Luxembourg Institute of Science and Technology
2025
Louisiana State University Agricultural Center
2012-2023
Clemson University
2010
Oregon State University
1999-2003
University of California, Davis
1975
Plant (United States)
1975
Multiplicative random cascades (MRCs) can parsimoniously generate highly intermittent patterns similar to those in rainfall. The elemental MRC model parameter is the cascade weight, which determines how rainfall at one scale partitioned next smallest cascade. While it known that probability density of these weights may vary with both time and intensity, nearly all previous studies have considered either or intensity separately. We examined simultaneous dependency on factors assessed impacts...
Abstract We investigated the potential effects of rainfall intensity smoothing by forest canopies on slope stability modelling soil responses to measured and throughfall during high‐intensity rain. Field measurements showed that maximum intensities precipitation were generally reduced under at two sites in Pacific Northwest, USA. Modelling water pore‐pressure a hypothetical hillslope field data resulted estimates greater canopy than for same without canopy. Results indicate may translate...
ABSTRACT Stable isotopes can be a valuable tool for tracing the redistribution, storage, and evaporation of water associated with canopy interception rainfall. Isotopic differences between throughfall rainfall have been attributed to three mechanisms: evaporative fractionation, isotopic exchange ambient vapor, temporal redistribution. We demonstrate potential importance fourth mechanism: mixing retained within (in bark, epiphytes, etc.) from prior rain events. Amount composition ( 18 O 2 H)...
Water flowpaths caused by incident rainfall onto forest canopy surfaces have a notable effect on the water budgets and chemistry of wooded ecosystems. This study revealed varying residence times at intra-event scale across phenological transition from leafed to leafless states for set three American beech (Fagus grandifolia Ehrh.) trees in multilayered canopy. Simultaneous measurements raindrops throughfall drops fifteen laser disdrometers over five rain events were analyzed during...
ABSTRACT Soil water budgets in floodplains are distinct from uplands because there more potential sources of yet remain poorly understood and represented the empirical literature. Stable isotopes hydrogen ( 2 H) oxygen 18 O) useful as tracers movement have improved conceptual understanding soil hydrological processes. We sampled two adjacent microsites at a ridge‐swale sequence forested floodplain Louisiana, USA to determine temporal spatial isotopic variability soils similar climate...
ABSTRACT An important mediating factor controlling the degree of connectivity between rivers and adjacent floodplains is texture structure floodplain alluvium. In fine‐textured alluvium, especially shrink‐swell clays, low hydraulic conductivity generally limits hydrologic flux, but consequences this for shallow groundwater have not been well investigated at scale. We used monitoring wells stable isotopes to characterise relative influence river flooding local precipitation on across four...
To gain a better understanding of tree vulnerability to drought stress, we need observe when and where stress occurs. Established techniques tend be limited by technical shortcomings in monitoring environmental plant conditions at appropriate temporal spatial scales. New overcome limitations are becoming available, but they must benchmarked tested range conditions.Thermal infrared (TIR) remote sensing allows detection because down-regulated transpiration due water shortage also reduces...
Spatio-temporal patterns of throughfall (TF) have often been studied under forest canopies. Few reports, however, made on small-scale TF variability in deciduous stands. In the present research, spatial heterogeneity and temporal stability five individual persian oak trees (Quercus brantii var. Persica) was quantified. The research site Zagros forests western Iran, where mean annual precipitation temperature are equal to 587.2 mm 16.9 °C, respectively. Data from 23 rainfall events were...
The 2011 flood in the Lower Mississippi resulted second highest recorded river flow diverted into Atchafalaya River Basin (ARB). higher water levels during peak high hydrologic connectivity between and floodplain, with up to 50% of moving off channel. Water quality samples were collected throughout ARB over course event. Significant nitrate (NO3−) reduction (75%) occurred within resulting a total NO3− 16.6% flood. floodplain was small but measurable source dissolved reactive phosphorus...
Abstract Inundation hydrology and associated processes control biogeochemical processing in floodplains. To better understand how hydrologic connectivity, residence time, intrafloodplain mixing vary floodplain wetlands, we examined water quality of two contrasting areas the Atchafalaya River—a flow‐through a backwater wetland—responded to an annual flood pulse. Large, synoptic sampling campaigns occurred both wetlands during rising limb, peak, falling limb hydrograph. Using combination...
Abstract Bottomland hardwoods are floodplain forests along rivers and streams throughout the southeastern United States. The interrelations among hydrology, soils, geomorphic landforms, tree species composition foundation of forest management in bottomland hardwoods, historically their correspondence has allowed for somewhat predictable responses based upon hydrogeomorphic setting. However, extensive hydrologic modifications floodplains have disrupted these and, on many sites, created novel...