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Relevant bibliographies by topics / Stream conservation Mathematical models / Dissertations / Theses

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Dissertations / Theses on the topic 'Stream conservation Mathematical models'

Author: Grafiati

Published: 10 December 2022

Last updated: 31 July 2025

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1

Romey, Bernard Timothy. "Modeling Spawning Habitat Potential for Chum (Onchorhynchus keta) and Pink Salmon (O. gorbuscha) in Relation to Landscape Characteristics in Coastal Southeast Alaska." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4252.

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In response to the increasing need for ecosystem services throughout the Southeast Alaska region, decision makers are tasked with balancing the need for natural resources with salmon conservation. However, accurate historical and current information on salmonid population abundance, freshwater distribution, and habitat quality are sparse with limited resolution for large portions of this remote and rugged landscape. Here, I created Intrinsic Potential (IP) models for chum and pink salmon to predict the potential for portions of coastal rivers to provide high-quality spawning habitat. I develop

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2

Jones, Hannah Elizabeth Mary. "Mathematical models for red squirrel conservation." Thesis, Heriot-Watt University, 2017. http://hdl.handle.net/10399/3340.

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In this thesis we develop mathematical models to understand the process of ecological invasion when the invading species also carries a disease that is harmful to the native species. In particular we focus on a key case study system of the invasion of grey squirrels and replacement of red squirrels in the UK, in which the shared disease, squirrelpox, has been suggested as a key driver of the rapid expansion of grey squirrels. Our initial study focused on examining the viability of red squirrels in the stronghold forests of Kidland and Uswayford in Northumberland. These are commercially managed

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3

MANTELLI, ELISA. "Mathematical Models of ice stream dynamics and supraglacial drainage." Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2640231.

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Patterning is a recurrent feature of glacial systems, which characterizes as much subglacial and supraglacial environments as the flow of ice itself. Some examples include bedforms developing at the contact between ice and bed, spatial organization in subglacial and supraglacial drainage networks, the narrow corridors of fast flowing ice known as ice streams that form the arterial drainage system of large ice sheets, and temporal switches between slow and fast flow regimes in glacier and ice stream flow. This thesis focusses on two types of glacial patterns, namely ice streams and channelizati

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4

Ashour, Osama Naim. "Receptivity to free stream acoustic disturbances due to a roughness element on a flat plate." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09052009-040628/.

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5

Vionnet, Leticia Beatriz, Thomas III Maddock, and David C. Goodrich. "Investigations of stream-aquifer interactions using a coupled surface-water and ground-water flow model." Department of Hydrology and Water Resources, University of Arizona (Tucson, AZ), 1997. http://hdl.handle.net/10150/615700.

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A finite element numerical model is developed for the modeling of coupled surface-water flow and ground-water flow. The mathematical treatment of subsurface flows follows the confined aquifer theory or the classical Dupuit approximation for unconfined aquifers whereas surface-water flows are treated with the kinematic wave approximation for open channel flow. A detailed discussion of the standard approaches to represent the coupling term is provided. In this work, a mathematical expression similar to Ohm's law is used to simulate the interacting term between the two major hydrological c

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6

Vionnet, Leticia Beatriz, and Leticia Beatriz Vionnet. "Investigation of stream-aquifer interactions using a coupled surface water and groundwater flow model." Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187414.

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A finite element numerical model is developed for the modeling of coupled surface-water flow and ground-water flow. The mathematical treatment of subsurface flows follows the confined aquifer theory or the classical Dupuit approximation for unconfined aquifers whereas surface-water flows are treated with the kinematic wave approximation for open channel flow. A detailed discussion of the standard approaches to represent the coupling term is provided. In this work, a mathematical expression similar to Ohm's law is used to simulate the interacting term between the two major hydrological componen

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7

Ahn, Taejin 1957. "A procedure for the determination of a flow duration curve at an ungaged basin." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276585.

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The purpose of this study is to develop a method for predicting monthly flow duration curves for ungaged basins that are suitable for estimating average annual flow, and installed capacity and average annual energy generation at potential sites for hydropower development. The procedures were tested by developing monthly rainfall duration curves for five sample watersheds and then developing flow duration curves from the rainfall data. The methods were evaluated by comparing the predicted monthly flow duration curves to daily and monthly flow duration curves based on field data from the selecte

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8

Kamwi, Innocent Silibelo. "Fitting extreme value distributions to the Zambezi river flood water levels recorded at Katima Mulilo in Namibia." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&amp.

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The aim of this research project was to estimate parameters for the distribution of annual maximum flood levels for the Zambezi River at Katima Mulilo. The estimation of parameters was done by using the maximum likelihood method. The study aimed to explore data of the Zambezi's annual maximum flood heights at Katima Mulilo by means of fitting the Gumbel, Weibull and the generalized extreme value distributions and evaluated their goodness of fit.

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9

Putnam, Douglas Alan. "Forecasting for local water management." PDXScholar, 1985. https://pdxscholar.library.pdx.edu/open_access_etds/3540.

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Forecast models are investigated and developed for use in local water management to aid in determining short term water requirements and availability. The forecast models include precipitation occurrence and depth using a Markov chain model, temperature and solar radiation with a multivariate autoregressive model, and streamflow with autoregressive-moving average models. The precipitation, temperature, and solar radiation forecasts are used with a soil moisture model to determine water demands. A state space approach to the Muskingum-Cunge streamflow routing technique is developed. The forecas

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10

Fournet, Victor. "Mathematical and Numerical Study of Thick Spray Models." Electronic Thesis or Diss., Sorbonne université, 2025. http://www.theses.fr/2025SORUS024.

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Cette thèse est consacrée à la modélisation, à l'analyse mathématique et à l'analyse numérique d'un système d'équations aux dérivées partielles décrivant l'évolution d'une suspension de par- ticules neutres dans un fluide ambiant, souvent désignée sous le nom de spray. La phase dispersée est modélisée par les équations de la théorie cinétique, tandis que la phase continue est décrite par les équations de la mécanique des fluides. Nous nous concentrons en particulier sur le cas des sprays dits épais. Le chapitre 2 est consacré au problème de la construction de soluti

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11

Hofstede, Coen Matthijs. "Ice Stream Dynamics: A Transition between Sheet Flow and Shelf Flow." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/HofstedeCM2008.pdf.

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12

Imam, Bisher 1960. "Evaluation of disaggregation model in arid land stream flow generation." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277033.

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A Disaggregation model was tested for arid land stream flow generating. The test was performed on data from Black River, near Fort Apache, Arizona. The model was tested in terms of preserving the relevant historical statistics on both monthly and daily levels, the monthly time series were disaggregated to a random observation of their daily components and the daily components were then reaggregated to yield monthly values. A computer model (DSGN) was developed to perform the model implementation. The model was written and executed on the Macintosh plus personal computer Data from two months we

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13

Luxhoj, James T. "A dynamic programming approach to the multi-stream replacement problem." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/49829.

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14

Linke, Simon, and n/a. "River conservation planning: accounting for condition, vulnerability and connected systems." University of Canberra. Resource, Environmental & Heritage Sciences, 2006. http://erl.canberra.edu.au./public/adt-AUC20070716.155500.

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Conservation science in rivers is still lagging behind its terrestrial and marine counterparts, despite increasing threats to freshwater biodiversity and extinction rates being estimated as five times higher than in terrestrial ecosystems. Internationally, most protected rivers have been assigned reserve status in the framework of terrestrial conservation plans, neglecting catchment effects of disturbance. While freshwater conservation tools are mainly index based (e.g. richness, rarity), modern terrestrial and marine conservation planning methods use complementarity-based algorithms - proven

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15

El, Moueddeb Khaled. "Principles of energy and momentum conservation to analyze and model air flow for perforated ventilation ducts." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=42024.

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A theoretical model was developed to predict the air distribution pattern and thus to design perforated ventilation ducts equipped with a fan. The analysis of the air distribution pattern of such systems requires accurate measurement procedures. Several experimental methods were tested and compared. Accordingly, the piezometric flush taps and thermo-anemometer were selected to measure respectively the duct air pressure and the outlet air flow.<br>Based on the equations of energy and momentum conservation, a model was formulated to predict the air flow performance of perforated ventilation duct

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16

Lam, King-hang, and 林勁恆. "Techniques for dynamic modelling of BIPV in supporting system design and BEMS." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39558460.

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17

Choy, Kin-yee, and 蔡建怡. "On modelling using radial basis function networks with structure determined by support vector regression." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B29329619.

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18

Chan, Shu-ning, and 陳樹寧. "Impact of river training on the hydraulics and sediment transport of Shenzhen River." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43572194.

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19

Slaughter, Andrew Robert. "Modelling the relationship between flow and water quality in South African rivers." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1006196.

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The National Water Act (Act 36 of 1998) provides for an ecological Reserve as the quantity (flow) and quality of water needed to protect aquatic ecosystems. While there are methods available to quantify the ecological Reserve in terms of flow, methods of linking flow to water quality are lacking. Therefore, the research presented in this thesis investigated various modelling techniques to estimate the effect of flow on water quality. The aims of the research presented in this thesis were: Aim 1: Can the relationship between flow and water quality be accurately represented by simple statistical

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20

Watson, Eric Craig. "Use of Distance Weighted Metrics to Investigate Landscape-Stream Temperature Relationships Across Different Temporal Scales." PDXScholar, 2016. http://pdxscholar.library.pdx.edu/open_access_etds/3117.

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Stream ecosystems have experienced significant negative impacts from land use, resource exploitation, and urban development. Statistical models allow researchers to explore the relationships between these landscape variables and stream conditions. Weighting the relevant landscape variables based on hydrologically defined distances offers a potential method of increasing the predictive capacity of statistical models. Using observations from three grouped watersheds in the Portland Metro Area (n=66), I have explored the use of three different weighting schemes against the standard method of taki

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21

Haltigin, Tim. "Three-dimensional numerical modeling of flow dynamics and investigation of temporal scour hole development around paired stream deflectors in a laboratory flume." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82249.

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A three-dimensional numerical model (PHOENICS) was used to investigate the role of stream deflector angle and length on the flow field in a rectangular laboratory flume. Subsequent bed topography surveys were performed to examine the role of obstruction angle on scour hole development over time. The model was capable of predicting laboratory velocity and turbulent kinetic energy measurements, performing better for flow over a flat stable bed than over a deformed sand bed. A new method of incorporating complex bed topography into a structured Cartesian mesh was developed in the process.

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22

Chiri, Maria Teresa. "Structural properties of solutions, approximation and control for conservation laws with discontinuous flux and bioinspired PDE models." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3424885.

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In this thesis we study theoretical and control type properties of three different classes of PDE: Scalar Conservation Laws with flux discontinuous, respectively, in the space and in the conserved quantity, and a Partial Integro-Differential Equation. In the first chapter we analyze the set of attainable profiles, at fixed time (with initial datum regarded as a control), by solutions to conservation laws with flux having a single discontinuity in the space and strictly convex or strictly concave behaviour outside the discontinuity. This analysis yields compactness properties of such a set whic

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23

Mattejat, Peter Paul. "Frequency analysis of low flows: comparison of a physically based approach and hypothetical distribution methods." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/101453.

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Several different approaches are applied in low flow frequency analysis. Each method's theory and application is explained. The methods are (1) physically based recession model dealing with time series, (2) log-Pearson type III and mixed log-Pearson type III using annual minimum series, (3) Double Bounded pdf using annual minimum series, (4) Partial Duration Series applying truncated and censored flows. Each method has a computer program for application. One day low flow analysis was applied to 15 stations, 10 perennial streams and 5 intermittent streams. The physically based method uses the

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24

Valente, Bruno Selim Avian. "Elaboração de um algoritmo de projeto de trocadores de calor para utilização em otimização de redes de trocadores de calor." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266631.

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Orientador: Roger Josef Zemp<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química<br>Made available in DSpace on 2018-08-21T18:17:49Z (GMT). No. of bitstreams: 1 Valente_BrunoSelimAvian_M.pdf: 588713 bytes, checksum: 01c679f3515305f57994ddc3e8057bb5 (MD5) Previous issue date: 2012<br>Resumo: A abordagem tradicional da estimativa da área no procedimento de síntese de redes de trocadores de calor exige a escolha de um conjunto típico de coeficientes de transferência de calor. Uma vez obtida a topologia da rede de trocadores de calor, o projeto detalhad

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25

Anasis, John George. "A Combined Energy and Geoengineering Optimization Model (CEAGOM) for Climate Policy Analysis." PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2620.

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One of the greatest challenges that will face humanity in the 21st century is the issue of climate change brought about by emissions of greenhouse gases. Energy use is one of the primary sources of greenhouse gas emissions. However, it is also one of the most important contributors to improved human welfare over the past two centuries and will continue to be so for years to come. This quandary has led a number of researchers to suggest that geoengineering may be required in order to allow for continued use of fossil fuels while at the same time mitigating the effects of the associated greenhou

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26

Zhou, Xueqing. "Predicting Solute Transport in Natural Streams - A Stochastic Approach." PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/5057.

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The existing theories for predicting longitudinal dispersion in straight open channels have long been recognized as inadequate when applied to natural rivers. These theories tend to grossly underestimate dispersion in real streams since an important mixing mechanism due to nonuniform river cross-section variations is not explicitly taken into account. Recognizing the important role of stream irregularities on solute transport and the analytical difficulties of classical deterministic analysis, we develop a stochastic approach for analyzing solute transport in natural streams. Variations in riv

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27

Hennlock, Magnus. "On strategic incentives and the management of stochastic renewable resources /." Uppsala : Dept. of Economics, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/2005124.pdf.

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28

Delboni, Roberta Regina 1979. "Dinamica populacional de microrganismos e a conservação de alimentos." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/307208.

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Orientador: Hyun Mo Yang<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Cientifica<br>Made available in DSpace on 2018-08-12T23:10:58Z (GMT). No. of bitstreams: 1 Delboni_RobertaRegina_M.pdf: 1935834 bytes, checksum: c76bab850d32e85026fe1a7e37e3e14d (MD5) Previous issue date: 2009<br>Resumo: Um grande desafio para a indústria de alimentos é, por um lado, atender a demanda dos consumidores por alimentos minimamente processados, livres de aditivos químicos e submetidos a tramentos térmicos mais brandos, devido ao forte apelo com

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Winship, Arliss J. "Estimating the impact of bycatch and calculating bycatch limits to achieve conservation objectives as applied to harbour porpoise in the North Sea." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/715.

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30

Dussán-Duque, Beatriz Salomé. "Ecology of the Guiana dolphin (Sotalia guianensis) in the Southern area of the Gulf of Morrosquillo, Colombia : implications for conservation." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/4153.

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Sotalia guianensis is listed as “Data Deficient” by the IUCN and as “Vulnerable” in Colombia. This study aimed to advance understanding of the ecology of this species and its habitats, and to provide information to conservation management in the southern Gulf of Morrosquillo, Colombia. Systematic boat-based surveys were conducted during 395 days in 2002-2006 and 2009-2010, following established routes. Total survey effort was 15,199 km in an area covering ~ 310km². Fine scale habitat use and behavioural modelling, photo-identification and mark-recapture techniques were used to analyze the ecol

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31

Yang, GuoLu. "Modèle de transport complet en rivière avec granulométrie étendue." Grenoble 1, 1989. http://www.theses.fr/1989GRE10011.

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Les variations des lignes d'eau et du lit des rivieres alluvionnaires dans le cas du transport complet (charriage+suspension) des sediments en granulometrie etendue sont etudiees par un modele mathematique uni-dimensionnel. Dans ce modele le charriage et la suspension sont consideres comme deux phenomenes du transport en tenant compte d'un terme source-puits qui represente l'echange entre eux. Le terme source-puits est formule par un modele d'echanges stochastiques considerant trois etats: suspension, charriage et immobilite, les probabilites des etats sont obtenues par le processus de chaine

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32

Didoné, Elizeu Jonas. "Modelagem de processos erosivos em uma bacia agrícola: limitações e possibilidades." Universidade Federal de Santa Maria, 2017. http://repositorio.ufsm.br/handle/1/11624.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>The growing demand for modeling tools able represent erosive processes in catchments, and their connections, requires that mathematical modelling be associated with monitoring. This doctoral thesis sought to contribute to a description of the erosive processes at catchment scale, by combining monitoring and modeling techniques to reduce the impacts of agricultural activities in a large agricultural catchment through scenarios that simulate the impact of different conservation measures. Two studies were carried out in the Co

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Galdino, Sérgio. "Estimativa da perda de terra sob pastagens cultivadas em solos arenosos da bacia hidrográfica do alto Taquari - MS/MT." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256830.

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Orientadores: Mara de Andrade Marinho, Edson Eiji Matsura<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agrícola<br>Made available in DSpace on 2018-08-20T22:57:38Z (GMT). No. of bitstreams: 1 Galdino_Sergio_D.pdf: 11328709 bytes, checksum: e5e5fc6d26b74b20826ad8a8bc4a4cef (MD5) Previous issue date: 2012<br>Resumo: O assoreamento do rio Taquari constitui grave problema ambiental e socioeconômico do Pantanal Brasileiro e decorre principalmente da erosão acelerada do solo ocupado com pastagens degradadas na parte alta da bacia. Um dos modelos mais utilizado p

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Aarts, Geert. "Modelling space-use and habitat preference from wildlife telemetry data." Thesis, St Andrews, 2007. http://hdl.handle.net/10023/327.

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Dissart, Jean-Christophe. "The economics of erosion and sustainable practices : the case of the Saint-Esprit watershed." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0006/MQ44158.pdf.

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Rolin, Raphaël. "Contribution à une démarche numérique intégrée pour la préservation des patrimoines bâtis." Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2450/document.

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Au travers de l’ensemble de ces travaux, l’objectif principal consiste à valider la pertinence de la construction et de l’utilisation de modèles 3D géométriques ou paramétriques orientés BIM/hBIM pour des analyses numériques. Il s’agit notamment d’études structurales dans le cas de bâtiments historiques ainsi que la planification potentielle de travaux de restauration, rénovation énergétique et réhabilitation. Des travaux d’exploitation complémentaires des données et des nuages de points, pour la détection, la segmentation et l’extraction d’entités géométriques ont également été intégrés dans

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Souza, Grazione de. "Modelagem computacional de escoamentos com duas e três fases em reservatórios petrolíferos heterogêneos." Universidade do Estado do Rio de Janeiro, 2008. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=711.

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Fundação Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro<br>Considera-se neste trabalho um modelo matemático para escoamentos com duas e três fases em reservatórios petrolíferos e a modelagem computacional do sistema de equações governantes para a sua solução numérica. Os fluidos são imiscíveis e incompressíveis e as heterogeneidades da rocha reservatório são modeladas estocasticamente. Além disso, é modelado o fenômeno de histerese para a fase óleo via funções de permeabilidades relativas. No caso de escoamentos trifásicos água-óleo-gás a escolha de expressões gerais para

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Barbosa, Nelson Machado. "Resolução numérica de equações diferenciais parciais hiperbólicas não lineares: um estudo visando a recuperação de petróleo." Universidade do Estado do Rio de Janeiro, 2010. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=1290.

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Fundação Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro<br>O processo de recuperação secundária de petróleo é comumente realizado com a injeção de água no reservatório a fim de manter a pressão necessária para sua extração. Para que o investimento seja viável, os gastos com a extração têm de ser menores do que o retorno financeiro obtido com o petróleo. Para tanto, tornam-se extremamente importantes as simulações dos processos de extração. Neste trabalho são estudados os problemas de Burgers e de Buckley-Leverett visando o escoamento imiscível água-óleo em meios porosos,

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Nemeth, Michael W., and University of Lethbridge Faculty of Arts and Science. "Climate change impacts on streamflow in the upper North Saskatchewan River Basin, Alberta." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Geography, c2010, 2010. http://hdl.handle.net/10133/2477.

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This research focuses on the estimation of the impacts of climate change on water yield, streamflow extremes, and the streamflow regimes in the Cline River Watershed, and consequently, water availability for hydropower generation in this area. The Cline River Watershed comprises the flow into Lake Abraham, the reservoir for Bighorn Dam, is part of the upper North Saskatchewan River basin (UNSRB). This objective was achieved by parameterizing the ACRU agro-hydrological modelling system. After parameterization was complete, ACRU output was calibrated and verified against available observed data,

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Abreu, Eduardo Cardoso de. "Modelagem e simulação computacional de escoamentos trifásicos em reservatórios de petróleo heterogêneos." Universidade do Estado do Rio de Janeiro, 2007. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=765.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Neste trabalho é apresentado um novo método acurado com passo de tempo fracionário, baseado em uma técnica de decomposição de operadores, para a solução numérica de um sistema governante de equações diferenciais parciais que modela escoamento trifásico água-gás-óleo imiscível em reservatórios de petróleo heterogêneos no qual os efeitos de compressibilidade do gás não foram levados em conta. A técnica de decomposição de operadores em dois níveis permite o uso de passos de tempo distintos para os três problemas definidos pelo procedi

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Xu, Yi-Long, and 許藝瀧. "Mathematical Model of the Street Light Energy Conservation." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/87969548216453672672.

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碩士<br>大葉大學<br>汽車電子產業研發碩士專班<br>98<br>In Taiwan, with regard to energy-saving education to reduce carbon, we face a double problem. Taiwan's energy consumption relies on imports of 98.3 percent, this is the limitations of their own resources, together with the now highly dependent on fossil energy, energy easily by outsiders; the other is a global problem, climate change caused by disasters, everyone has the opportunity to be affected. Both to resolve the key to mankind is to control the use of fossil fuels, so that the concentration of atmospheric carbon dioxide rise and slow down the changes

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Ngnotchouye, Jean Medard Techoukouegno. "Conservation laws models in networks and multiscale flow optimization." Thesis, 2011. http://hdl.handle.net/10413/7922.

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The flow of fluids in a network is of practical importance in gas, oil and water transport for industrial and domestic use. When the flow dynamics are understood, one may be interested in the control of the flow formulated as follows: given some fluid properties at a final time, can one determine the initial flow properties that lead to the desired flow properties? In this thesis, we first consider the flow of a multiphase gas, described by the drift flux model, in a network of pipes and that of water, modeled by the shallow water equations, in a network of rivers. These two models are systems

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Boyd, Matthew S. "Heat source : stream, river and open channel temperature prediction." Thesis, 1996. http://hdl.handle.net/1957/27036.

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Reach defined analysis concentrated on the water temperature change that occurred in a stream/river segment over the course of one full diurnal cycle. Digital thermistors, data loggers and computer model development were utilized in reach analysis to link parameters of the stream system to a specific temperature change. The methodology employed was relatively simple and fast, and many successive stream segments were analyzed simultaneously. Reach analysis of stream temperature change identified the existing components of the stream system that caused increased water temperature and predicted t

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"Some topics on nonlinear conservation laws." 2007. http://library.cuhk.edu.hk/record=b5893360.

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Duan, Ben.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2007.<br>Includes bibliographical references (leaves 61-67).<br>Abstracts in English and Chinese.<br>Acknowledgments --- p.2<br>Abstract --- p.i<br>Introduction --- p.3<br>Chapter 1 --- Stability of Shock Waves in Viscous Conservation Laws --- p.10<br>Chapter 1.1 --- Cauchy Problem for Scalar Viscous Conservation Laws and Viscous Shock Profiles --- p.10<br>Chapter 1.2 --- Stability of Shock Waves by Energy Method --- p.15<br>Chapter 1.3 --- L1 Stability of Shock Waves in Scalar Viscous Con- servation Laws --- p.20<br>Chapt

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Cui, Gurong. "Rainfall runoff model improvements incorporating a dynamic wave model and synthetic stream networks." Diss., 1999. http://www.newcastle.edu.au/services/library/adt/public/adt-NNCU20030120.144918/index.html.

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"Multi-dimensional conservation laws and a transonic shock problem." 2009. http://library.cuhk.edu.hk/record=b5894118.

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Weng, Shangkun.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2009.<br>Includes bibliographical references (p. 73-78).<br>Abstracts in English and Chinese.<br>Abstract --- p.i<br>Acknowledgement --- p.iii<br>Chapter 1 --- Introduction --- p.1<br>Chapter 2 --- Existence and Uniqueness results of transonic shock solution to full Euler system in a large variable nozzle --- p.11<br>Chapter 2.1 --- The mathematical description of the transonic shock problem and main results --- p.11<br>Chapter 2.2 --- The reformulation on problem (2.1.1) with (2.1.5)-(2.1.9) --- p.18<br>Chapter 2.3 --

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"Parameter free document stream classification." Thesis, 2006. http://library.cuhk.edu.hk/record=b6074286.

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Extensive experiments are conducted to evaluate the effectiveness PFreeBT and PNLH by using a stream of two-year news stories and three benchmarks. The results showed that the patterns of the bursty features and the bursty topics which are identified by PFreeBT match our expectations, whereas PNLH demonstrates significant improvements over all of the existing heuristics. These favorable results indicated that both PFreeBT and PNLH are highly effective and feasible.<br>For the problem of bursty topics identification, PFreeBT adopts an approach, in which we term it as feature-pivot clustering

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Vortkamp, Irina. "Biological conservation: mathematical models from an ecological and socio-economic systems perspective." Doctoral thesis, 2021. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-202110015459.

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Conservation in the EU and all over the world aims at reducing biodiversity loss which has become a great issue in the last decades. However, despite existing efforts, Earth is assumed to face a sixth mass extinction. One major challenge for conservation is to reconcile the targets with conflicting interests, e.g. for food production in intensively used agricultural landscapes. Agriculture is an example of a coupled human-environment system that is approached in this thesis with the help of mathematical models from two directions. Firstly, the ecological subsystem is considered to find proce

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Jia, Siwei. "Optimization, conservation and valuation of contingent claims in economic resource management under uncertainty." Thesis, 2004. http://hdl.handle.net/1957/29439.

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Fuller, Trevon Louis. "Area prioritization for optimal conservation planning." 2009. http://hdl.handle.net/2152/18392.

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This dissertation develops an optimization framework for conservation planning and illustrates the framework using case studies from Alaska, Balcones Canyonlands National Wildlife Refuge (BCNWR) in central Texas, and Mexico. The common theme of the chapters is the use of optimization models to design conservation areas. Chapter 1 explains how the subsequent chapters are related to one another. Chapter 2 develops a framework for measuring how the cost of establishing conservation areas changes over time. When this method is applied to a data set on Mexican mammals, it is shown that twice as muc

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