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 23 for “"environmental flow"”.
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Ecologically-focused calibration of hydrological models for environmental flow applications
… of aquatic ecosystem degradation. Developing environmental flow criteria for managing the effects of urbanization and other human influences requires quantitative flow-ecology relationships that link biological responses to streamflow alteration. To the extent possible, gaged flow data are …
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Multiscale environmental flow dynamics: particle settling, turbulence modulation, and tornadic vortices
Environmental flows form the basis of processes that span sediment transport in rivers, drag reduction in pipelines, and the evolution of severe atmospheric vortices. Despite significant efforts to address related phenomena, a predictive, mechanistic description of how particles, non‑Newtonian …
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Environmental Flow Determination in Headwater Catchments of Luvuvhu River in Limpopo Province, South Africa
… legislation officially integrates ecological flow allocation within its legal framework, yet implementation in data-scarce, ecologically sensitive headwaters remains uneven and/or underdeveloped. This study addresses the absence of defensible environmental flow requirements (EFRs) in the upper …
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Environmental Flow Regime Recommendations for the Promotion of Salicaceae Seedling Recruitment in California’s Central Valley
… are being degraded due to alteration of natural flow regimes caused by the creation of dams and diversions to serve human needs for water. Alteration to natural flow regime affects a river’s flow magnitude, frequency, duration, timing, and rate of change of flow. These changes have major …
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Novel approaches for environmental flow estimation: evaluating methodological uncertainty through coupled hydrological modeling in regulated river basins
… mediante el uso del modelo acoplado SWAT+gwflow. Este enfoque, combinado con una novedosa calibración específica en caudales bajos, demostró ser superior al modelo SWAT+ independiente, corrigiendo la subestimación sistemática y reproduciendo con mayor realismo el régimen natural del río. …
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Managing Complex Water Resource Systems for Ecological Integrity: Evaluating Tradeoffs and Uncertainty
… production, water delivery, recreation, and environmental needs. This complexity makes it difficult to holistically assess management alternatives. In addition, hydroclimatic and ecological uncertainties complicate efforts to evaluate the impacts of management scenarios. We need new tools …
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A Comparative Study of Rural Water Governance in the Limpopo Basin
… issues such as demand management, water quality, environmental flow requirements etc, and not the development of water infrastructure, begs the question whether such reforms can make a meaningful contribution to the development agenda in countries where, during apartheid and colonialism, the water …
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Time-optimal path planning for sea-surface vehicles under the effects of strong currents and winds
… a set of coordinates, taking into account flow currents and wind speeds. This thesis reviews the literature on a modified level set method that governs the path in any continuous flow to minimize travel time. This new level set method, pioneered by MSEAS, evolves a front from the starting …
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Assessment of surface water availability in Solwezi River Basin, NothWestern Province, Zambia
… and Water Balance methods to determine inflows and outflows in the catchment. The water balance model developed revealed that the total inflows of the surface runoff generated in the catchment was 985,841m3/day while the outflows amounted to 1,078,209.8 m3/day. The outflows were comprised …
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Assessment of surface water availability in Solwezi River Basin, NothWestern Province, Zambia
… and Water Balance methods to determine inflows and outflows in the catchment. The water balance model developed revealed that the total inflows of the surface runoff generated in the catchment was 985,841m3/day while the outflows amounted to 1,078,209.8 m3/day. The outflows were comprised …
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Multi-Scale Localized Perturbation Method for Geophysical Fluid Flows
… for the purpose of solving complex geophysical flow problems. Simulation variables are decomposed into background and perturbation components, then assumptions are made about the evolution of these components within the context of an environmental flow in order to close the system. Once closed, …
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Modeling watershed management with an ecological objective - a multi-agent system based approach
… of Hydrologic Alteration (IHAs) to represent the environmental flow condition, genetic programming generated a quantitative relationship (equation) between natural flow regime metrics (hydrology) and fish community indices (ecology). After a robustness test shows that each metrics in the equation …
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Mobility and turbulence in the socio-environnmental flows of the European Union: explaining resistance to wind energy policy in the spatial planning process
Considering public policy as a socio-environmental flow this study follows the European Union’s wind energy “policy chain”, from formulation to implementation, in order to understand the inner dialectics that influence the success or failure of such projects in two south-west counties in Ireland. …
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Restoration and Water Management in the Atchafalaya River Basin, Louisiana
<p>Environmental restoration in aquatic systems requires innovative approaches that combine scientific understanding, socioeconomic demands, and local stakeholder values into decisions. However, changing approaches to water management to address these requirements is difficult because of scientific …
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The platypus : historical, ecological, and behavioural advances to improve the conservation of an elusive species
… downstream of dams with significantly altered flow regimes had lower abundances and densities of platypuses than above dams, while the opposite was true for rivers where flow regimes had been improved. In Chapter 4, movement tracking highlighted interactions among individuals in a localised …
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A high-order hybrid flow solver for the simulation of nonlinear internal waves in long complex domains
… simulations pose a great challenge in environmental flow solvers. This dissertation discusses the mathematical formulation and numerical implementation in a high-performance-computing context of a hybrid Spectral Element Method and Fourier Galerkin (SEM/FG) flow solver specifically …
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Providing a Restoration Framework for Regulated Rivers
… scientific literature, restoring natural stream flows in disturbed rivers is dependent upon developing quantitative, transferable stream flow-ecology relationships. The purpose of my dissertation was to apply a framework to regulated and unregulated streams within an eight-state region of the …
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Responses of Aquatic Benthic Macroinvertebrate Communities to a Large Flow Pulse in the Guadalupe, San Antonio and Brazos River Basins, Texas
… in part, by the dynamic character of the river’s flow regime. Purpose of this study was to assess the influence of a flow regime component (i.e., large flow pulse) on BMI riffle communities, specifically that large flow pulses shifted structure (i.e., richness and density), and therefore maintain …
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Evaluation of irrigation water demand and agricultural land use in relation to surface water availability in Chongwe catchment.
… water resources, allocation and understand environmental flow requirements of the catchment. The methodology involved literature review, data collection, data analysis, presentation of research findings and report writing. Literature review was achieved through the use of text books, …
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