Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 42 for “"water fluxes"”.
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Functional role of plant water fluxes in nutrient acquisition
… mass-flow. In addition to transpiration, plants water fluxes occur through hydraulic redistribution (HR). I hypothesized that an important function of plant water fluxes is to drive mass-flow nutrient acquisition, with flux rates positively correlated with nutrient limitation but not deficiency. …
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Water Fluxes in Soil-Pavement Systems: Integrating Trees, Soils and Infrastructure
… only unsealed soil surface and are important for water exchange between soil and atmosphere. Therefore, covering tree pits with pavement, even permeable, may have implications for the urban water balance and stormwater management. A better understanding of permeable pavement on tree pavement soil …
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Quantifying Solute and Water Fluxes in Headwater Streams Using Passive Flux Meters
… be used to determine time-integrated patterns of water chemistry at one or many locations throughout a stream network while minimizing cost and sampling time. A passive flux meter (PFM) simultaneously estimates time-averaged water and solute mass fluxes in flowing water. PFMs have been used in …
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A new passive surface water flux meter for simultaneous measurement of contaminant and water fluxes in streams and rivers
<p>A passive surface water flux meter (PSFM) for measurement of contaminant concentration/flux in rivers and streams is described and tested. The novel PSFM design was developed for portability and ease of adaptability for a variety of contaminant classes. Although previous designs have been …
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Dynamic forcing of oxygen, iron, and manganese fluxes at the sediment-water interface in lakes and reservoirs
… a more interdisciplinary approach to drinking water research to address the critical issue of global drinking water supplies. Hypolimnetic oxygenation systems (HOₓ) are being increasingly used to improve water quality in stratified reservoirs by increasing dissolved oxygen (O₂) concentrations …
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Ecological-Hydrological Feedback in Forested Wetlands
… wetlands, the biotic and abiotic consequences of water level variability is not well understood. The effects of flooding on carbon and water exchanges are important knowledge gaps where progress could benefit management of natural resources and predicting of changes in surface geophysical cycles. …
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Phenology Effects on Carbon and Water Dynamics in a Pristine Boreal Fen A multi-decadal analysis from 2005-2007 & 2014-2022
… major constituents of the global carbon (C) and water cycles and therefore important climate regulators. These cycle dynamics are strongly determined by plant phenology (e.g.,vascular plant photosynthesis and seasonality) and evapotranspiration (ET), next to other abiotic factors. While it is …
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Impacts of model-data uncertainties on biogeophysical-biogeochemical interactions in a land surface model (with an emphasis on the northern high-latitude regions)
… more affected by biases in factors controlling water stress (precipitation, humidity, air temperature). In this chapter, I also discussed the influence of seasonal patterns of meteorological biases on GPP, and finally the impacts of the results on GPP simulations for the entire global land …
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Hyporheic flow in a mountainous riverine system
… and improve our overall conceptual model of water storage and flow through riverine valleys. The objective of this study was to determine the influence of instream beaver dams on vertical and lateral hyporheic exchanges. Hyporheic interactions were examined using hydrometric methods to …
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Non-invasive monitoring of water and solute fluxes in a cropped soil
Although the influence of root water uptake on solute transport is commonly recognized as important, it has barely been studied throughout the literature. However, plants take up a big amount of the infiltrating water and therefore they influence water flow patterns in the soil and concurrently …
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Exploring the determinants of chloride homeostasis in neurons using biophysical models
… impermeant anions, electrodiffusion, water fluxes and cation-chloride cotransporters (CCCs) play roles in setting the Cl- driving force. Importantly, I show that while impermeant anions can contribute to setting [Cl- ]i in neurons, they have a negligible effect on the driving force for …
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Numerical Simulation of Cold Front-Related Hydrodynamics of Wax Lake Delta
… winter cold fronts. The major findings are: (1) Water fluxes in the delta distributary network are not solely propagated within the channels but also between the channels, indicating inundation process by water intrusion onto the saltmarshes, which accounts for ~25% of water flux. (2). The …
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A multi-criteria evaluation of land-surface models and application to semi-arid regions
… to simulate carbon (along with energy and water) fluxes in semi-arid regions. Results show poor performance for carbon flux simulations and that improvements are needed to better represent C4 vegetation for semi-acid regions. Future research will be directed toward integrated modeling …
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Cosmic-ray neutron sensing and its applications to soil and land surface hydrology
Water scarcity, adaption on climate change, and risk assessment of droughts and floods are critical topics for science and society these days. Monitoring and modeling of the hydrological cycle are a prerequisite to understand and predict the consequences for weather and agriculture. As soil water …
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Estimating hydrologic fluxes, crop water use, and agricultural land use in China from multiple data sources
… (Ramankutty et al., 2008) and by altering the water cycle through both co-opting rainfall and surface water withdrawals (Postel et al., 1996). As the world's population continues to grow and individual diets become more resource-intensive, the demand for food - and the land and water necessary …
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Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments
… at the interface between sediments and surface waters because they are hotspots for biogeochemical transformations such as redox reactions, nutrient consumption and regeneration, organic matter leaching and degradation, and mineral weathering. Radium isotopes (223Ra, 224Ra, 226Ra, 228Ra) and …
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Tritium Plume Dynamics in the Shallow Unsaturated Zone Adjacent to an Arid Waste-Disposal Facility, Amargosa Desert Research Site, Nevada
… Nevada have documented two plumes of tritiated water-vapor (<super>3</super>HHO<sub>g</sub>) adjacent to a closed, commercial low-level radioactive waste disposal facility. Wastes were disposed at the facility from 1962-92. Tritium has moved long distances (> 400 m) through a shallow (1-2-m …
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Analyzing Evapotranspiration in the Tropical Montane Cloud Forest at Sierra de Bahoruco, Dominican Republic
… expansion in surface area, along with other water bodies in the same region, since 2004 causing major flooding to the surrounding agricultural and cattle-raising lands, infrastructure and communities. Understanding why the lake is expanding at such rapid rate and accurately forecast how they …
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The role of short-term atmospheric variability in shaping Lagrangian transport in the Southern Benguela
… atmospheric forcing (surface heat and fresh-water fluxes and wind stress). In simulation B and C, the atmospheric forcing is low-pass filtered with 5 days and 30 days cut-off periods. The ocean model outputs are averaged and saved at deferent temporal frequency: frequencies of 6 hours and 3 …
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Assessing the contribution and variations of spring discharges to river flows within the Nuwejaars Catchment, Cape Agulhas
Water resource management in South Africa has not stressed the importance of springs as a water resource and fails to integrate surface water and groundwater as one essential resource functioning interchangeably. The investigation of springs as a water resource is a way of understanding the …
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