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.
Results
Showing 1 to 10 of 10 for “"end-member mixing"”.
-
Oxygen Isotopes as a Tracer of DOM Processes in River-Estuary Systems
… is explored in the Delaware estuary. Using a two end-member mixing model, DOM oxygen isotopes are compared with carbon isotopes, DOC concentrations and elemental ratios to determine if changes are a result of two water bodies mixing. Isotope values are decoupled from concentration values and …
-
Groundwater-surface water exchange within montane and alpine regions of the Front Range and Rocky Mountains, Colorado
… a montane creek within the Front Range. An end-member mixing model was performed on Andrews Creek in Rocky Mountain National Park to look at changes in water source contributions over 15 years, while multiple stream tracer tests were performed in the Gordon Gulch catchment in the Boulder …
-
The Hydrology of the Carroll Cave-Toronto Springs System: Identifying and Examining Source Mixing through Dye Tracing, Geochemical Monitoring, Seepage Runs, and Statistical Methods
… Cave and Wet Glaize Creek are the primary end members for Ca2+, Mg2+, HCO3-, specific conductance, and temperature. Using these parameters a two end member mixing model has been developed which describes the mixing zone setting at Toronto Springs and calculates the average proportions of …
-
The Carbon Budget of the Mekong River Basin: A Spatial and Temporal Study of Chemical Weathering
… atmosphere, are not thoroughly understood. Depending on the reaction environment the lithologically--sourced carbon released from the sulfuric acid weathering of carbonates can either degas as CO$_{2}$ instantaneously to the atmosphere, or can be transferred as bicarbonate (HCO$_{3}^{-}$) to …
-
A multi-scale assessment of aquatic ecosystem processes across the land-ocean-atmosphere continuum: from headlands to the sea
… determined by isotopic and compound specific end member mixing models, significantly decreased between Obidos and each respective channel near the mouth. Highland-derived DOM was on average less than 10% of the DOC near the mouth, whereas highland POC was, on average, roughly 50% of total POC …
-
Investigating Telogenetic Karst Aquifer Processes and Evolution in South-Central Kentucky, U.S., Using High-Resolution Storm Hydrology and Geochemistry Monitoring
… event variability throughout the year. A two end member mixing analysis (EMMA) is used to analyze storm flow conditions versus baseflow conditions, and a predictive model is presented that is used to predict peak springflow based upon rainfall totals. A detailed water budget analysis and …
-
Hydrochemical Dynamics Under Differing Winter Climate Regimes at the Hubbard Brook Experiment Forest
… chemistry data were analyzed to assess the trends of overall recovery from acidification, as well as a trends associated with the snowmelt periods of the record, which are characterized by seasonal and episodic acidification of stream runoff. Trends varied by landscape position, but the …
-
Using Emerging Methods to Investigate Stream and Groundwater Interaction at Multiple Spatial Scales
… support a mosaic of living communities in a blend of surface and ground waters. The physical and biogeochemical patterns these dynamic systems support affect natural habitat and water quality, directly impacting the human experience. Our understanding of stream and groundwater interactions is …
-
The phosphorus transfer continuum under climate change
… for three distinct UK DTC catchments, and Extended End-Member Mixing Analysis (EEMMA), I explore how climate change (UKCP09 scenarios) might impinge on catchment total phosphorus (TP) retention and sensitivity, which is determined by catchment characteristics to P input pressures. This study …
-
Plutonium isotopes in the North Atlantic
… from 0.2-23 x l04, with some suggestion of a trend towards lower values in the deeper cores (Kd's <104 in cores from water depths >2500m). Diffusive flux calculations based upon the observed Pu pore water gradients suggest that since its introduction, negligible Pu has been remobilized out of …