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 26 for “"flow routing"”.
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Applicability of Hydraulic Performance Graph for Unsteady Flow Routing
… hydraulic performance graph (HPG ) for unsteady-flow routing is investigated herein. The HPG is a summary of backwater profiles in a channel reach in terms of discharge and water stages at its downstream and upstream ends. Traditionally, in hydraulic flow routing the Saint-Venant equations, or …
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Flow routing in the parallel pipes of a combined sewer system
… to a twin pipe sewer system. The model predicts flow and level for each of the parallel pipes and deals with the complex behaviour which occurs at cross-connections.<br/><br/>The model DUPPERS is an enhancement of the single pipe simulation model DUCTS developed at Dundee Institute of Technology. …
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Vegetative filter strip assessment in the state of Iowa
… enters a water-body. The project analyzes the flow accumulation of runoff with the help of Geographic Information Systems (GIS). The objectives for this project include (1) To determine the effectiveness of VFS by visual field observation and validation by flow mapping procedures in ArcGIS 9, …
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The Hydrological System of Storglaciären, Sweden: Integrating Modelling with Observations
… surface for the entire summer, a surface-routing model to route this meltwater (and precipitation) across the surface either until it runs off Storglaciären’s edges or is intercepted by moulins extending into the internal system, and a subglacial-hydrology model where inflow from moulin …
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Spatial distribution of global runoff and its storage in river channels
… the representation of river networks for flow simulations. The performance of simulated river networks is analyzed with respect to resolution which provides guidance for the design of simulated river networks. New relationships are developed between river discharge and the riverbed …
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Three-Dimensional Volume Averaged Soil-Moisture Transport Model: A Scalable Scheme for Representing Subgrid Topographic Control in Land-Atmosphere Interactions
… the Richards equation to incorporate the lateral flow and subgrid heterogeneity due to topography. A conjunctive surface-subsurface flow model at a large scale, a 1-D Diffusion Wave (DW) surface flow model interacting with the 3-D VAST model, is developed for the comprehensive terrestrial water …
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Control design techniques for constrained positive compartmental systems with applications to air traffic flow management
… delay scheduling in the presence of uncertain flow rate constraints, and traffic flow routing under time varying airspace capacity constraints. Aggregate models are used to describe the flow of traffic in the region of airspace of interest. The solution methods presented are based on sliding …
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Some Cardinality Estimates are More Equal than Others
… an optimizer. We introduce a new loss function, Flow-Loss, for learning cardinality estimation models. Flow-Loss approximates the optimizer’s cost model and search algorithm with analytical functions, which it uses to optimize explicitly for better query plans. At the heart of Flow-Loss is a …
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Island Genetic Algorithm-based Cognitive Networks
… joint power and channel allocation, and flow routing. The channel allocation problem is a major challenge for dynamic spectrum access which, in turn, has been the focal application for cognitive radios and cognitive networks. The other problems are examples of hard cross layer problems. …
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Metropolitan Area Network architecture design for Optical Flow switching
Optical Flow switching (OFS) is a key enabler of future scalable all-optical networks for the large traffic flows. In this thesis, we provide design concepts of efficient physical topology and routing architectures for an all-optical Metropolitan Area Network (MAN) that supports OFS. We use …
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On Throughput Maximization in a Multi-hop MIMO Ad Hoc Network
… each session is given priori. Although the fixed routing decreases the size of the problem, it also limits the performance of the network to a great extent. The goal of this thesis is to employ this new model to solve the throughput maximization problem by jointly considering flow routing, …
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Optimization based nonlinear feedback control for pedestrian evacuation from a network of corridors
… corridors is divided into two basic problems of flow routing and flow control. In this study the solutions of these two basic problems are developed. The proposed solution for the flow routing problem is based on the concept of shortest paths on a graph wherein the shortest paths are determined …
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An Evaluation of a Hydrological Model Used to Predict the Impact of Flow Attenuation on Downstream Flood Flows
… reduced complexity hydrological model called Overflow, which was used to predict the impact of flow attenuation on downstream flood flows. The model behaviour was theoretically consistent with physical processes, allowing it to be calibrated for the River Seven, North Yorkshire for a flood event …
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Water management for lowland rice irrigation
… probability level during some weeks. The EXTRAN flow routing model was used to simulate water flow in the upper reaches of the main canal system for varying discharges at the head gate each day. The simulated water depths were used to determine the gate settings required at the turnout structures …
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Design and Implementation of An Emulation Testbed for Optimal Spectrum Sharing in Multi-hop Cognitive Radio Networks
… scheduling and interference constraints, and flow routing. We give a formal mathematical formulation with the objective of maximizing the network throughput for a set of user communication sessions. Since such problem formulation falls into mixed integer non-linear programming (MINLP), which …
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A spatially responsive catchment model for predicting stormwater runoff from ungaged watersheds
… a rainfall excess generator and a flood routing algorithm. The Holtan infiltration equation was used as the basis of a soil moisture routine to estimate rainfall excess from a given rainfall distribution. The finite element technique, with Galerkin's residual method, was used to provide a …
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Cross-Layer Optimization and Distributed Algorithm Design for Frequency-Agile Radio Networks
… and propose simple joint channel scheduling and flow routing optimization algorithm that maximizes network throughput. The model quantifies the impact of fundamental network settings, such as node density and traffic load, on the performance of partially overlapped channel based networks. We then …
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Modeling Intermittent and Perennial Headwater Stream Origins In North Carolina.
… delineate these streams or predict channel flow durations without fieldwork. Recent advances in remote sensing may allow more accurate headwater stream mapping.</p> <p>Methods for mapping intermittent and perennial headwater streams with a GIS-based modeling approach coupled with field …
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Algorithms and Optimization for Wireless Networks
… a polynomial-time algorithm to calculate the flow routing schedule such that the LMM-optimal node lifetime vector can be achieved. Second, we show that the same approach can be employed to address a different but related problem, called LMM rate allocation problem. More important, we discover …
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Hydraulic evaluation of a denitrifying bioreactor with baffles
… design considerations include a bypass flow pipe to prevent significant reduction of drainage capacity in the field. This practical need for a bypass pipe results in a portion of the annual flow volume being untreated which limits a bioreactor’s overall N removal performance. Bioreactors …
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