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Merckelbach, L. (author)In this thesis the modelling of water wave propagation over uneven bottoms using Boussinesq-like models with higher-order frequency dispersion is studied. Boussinesq-like equations describe the propagation of weakly non-linear shallow water waves. As for long waves the depth-dependence of the velocity field is almost absent, the vertical...master thesis 1995
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Reijnders, M. (author)The seabed of many coastal and estuarine areas in the world mainly consists of mud. The interest in the complex behaviour of mud has increased considerably the last few decades, because mud has become more and more a menace to the environment. Contamination o f mud has infertalized agricultural land and with the increase of harbor activity,...master thesis 1995
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Van Endt, M.J. (author)Baggeraars en offshore aannemers hebben groot belang bij goede voorspellingen van zowel windzee als deining. Deze voorspellingen kunnen gebaseerd zijn op observaties of op numerieke golfmodellen. Data assimilatie is een manier om de observaties zodanig te gebruiken, dat de model golfparameters zo dicht mogelijk de gemeten golfparameters...master thesis 1995
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Bijvelds, M.D.P. (author)This thesis describes the numerical modelling of discharges where density differences play an important role, in particular positive buoyant cooling water discharges. Two regions, in which the hydrodynamics are influenced by the discharge, can be distinguished; the near-field and the far-field. In the former region the initial jet...master thesis 1995
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Bosboom, J. (author)In this thesis, the modelling of the horizontal velocity field under waves using Boussinesqtype models is studied. Special attention is paid to the prediction of bottom velocities in view of sediment-transport formulations. Boussinesq-type models describe the propagation of weakly non-linear shallow-water waves. The depth-dependence of the...master thesis 1995
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Berghuis, E.P.D. (author)Lake Maracaibo, Venezuela is an outstanding example of today's conflict of interests between protection of natural resources and economic development because of the extensive use of the area. The exchange and interaction between the fresh water of the Lake and the saline water from the Gulf of Venezuela is an important mechanism in the...master thesis 1995
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Van Haaren, Y. (author)A continuous transport cycle of mud material can be noticed in a natural water environment. Aggregation, settling, deposition, consolidation and erosion are typically interlinked. These processes are influenced by the cohesive properties of the mud and by the characteristics of its environment. Fluid mud is a highly concentrated near-bed...master thesis 1995
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Van der Biezen, S.C. (author)In the scope of NOURTEC, an EEC project, efforts are made to simulate the behaviour of executed foreshore supplies with the aid of mathematical computer models. One of the models used are line models. On behalf of the DUT two studies contribute to NOURTEC line modelling. One concentrates on the longshore transport, and the present study focuses...master thesis 1995
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Wiltink, E. (author)Het verticale transport komt tot uiting in concentratieprofielen. Het alom bekende concentratieprofiel heeft een grote concentratie aan de bodem die monotoon naar boven toe afneemt. In het algemeen wordt het turbulente sedimenttransport beschreven als een diffusieproces. Vragen die hierbij rijzen zijn de volgende: is deze beschrijving bruikbaar...master thesis 1995
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Mooij, M. (author)De stonnvloedkering die ontworpen is voor de lagune bij de stad Venetië bestaat uit kleppen die onder normale omstandigheden verzonken liggen op de bodem. Als een hoge waterstand dreigt kunnen de kleppen vol worden gepompt met lucht, zodat ze, draaiend om een scharnier op de bodem, omhoog drijven en een waterstandsverschil kunnen keren. De...master thesis 1995
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Somers, C. (author)In de ontwerpfase van de Maeslant Kering zijn door het WL tweedimensionale en driedimensionale modelproeven uitgevoerd. Tijdens de driedimensionale proeven werd een aantal niet voorziene instabiliteiten waargenomen. Naar aanleiding van deze proefresultaten werden het deurprofiel en de vormgeving van de onderzijde veranderd, zodat de stabiliteit...master thesis 1995
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Kwik, M. (author)Bij het ontwerpen van dijken gelden golfoploop en golfoverslag als belangrijke criteria. Een manier om golfoverslag te kwantificeren is d.m.v. het over de tijd gemiddelde overslagdebiet. Van dit debiet is bekend dat het afhangt van de surf similarity parameter en de dimensieloze kruinhoogte. Ook is bekend hoe de invloed van berm, taludruwheid,...master thesis 1994
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Van Dam, J.D.F. (author)On January 1st 1992 one of the most severe storms passed by the Northern North Sea. The Shell/Esso Tem platform is located in that area, north east of the Shetland Islands and has monitoring equipment installed. Time series data for surface elevation and velocity are analysed to obtain estimates for surface and velocity spectral densities and...master thesis 1994
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van den Berg, J.Q. (author), Bouvy, H.B. (author)In this report we describe the phenomenon of pedestrian flow in case of large crowds leaving stadiums, buildings etc. First we made an extensive search through literature existing on this subject. We searched for existing models describing the flow of pedestrians under different conditions. Two researchers from the former Sovjet Union developed...master thesis 1994
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Reuber, J. (author)The subject of this master thesis is to present the processes taking place at the erosion of a fluid mud layer due to entrainment, to carry out experiments in an annular flume and compare the results of these experiments with a numerical model, which has been elaborated at the TU Delft. The report can be devided into five parts: physical and...master thesis 1994
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Aghababazadeh, F. (author)The study of waves and current, especially in the nearshore region is of particular importance for nearshore or coastal works. During the last decades, the formulations to describe the wave propagation as the waves move towards the shore has advanced very much. Many operational models for the hindeast and forecast of waves have been developed....master thesis 1994
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Beyer, D. (author)The present wave transformation models for random waves make use of an explicit formulation of the energy dissipation. A time-averaged model has been studied in which the dissipation rate per breaking wave is estimated from that in a bore of corresponding height. The probability of occurrence of breaking is derived from a wave height...master thesis 1994
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Van Agthoven, A.M. (author)Detailed studies have been carried out for fetch and duration limited wave growth and fully developed sea state, but much less is known about changing wind conditions. The subject of this study is the response of waves to a change in wind speed. The main point of interest is the rate of response at the different frequencies. Two third generation...master thesis 1994
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Bloemsma, M. (author)The design and re-assessment of fixed offshore structures for operation in the harsh conditions of the North Sea is largely determined by extreme environmental loading. The ability to predict accurately the extreme storm load remains an important factor in the continued safe and economic exploitation of the hydrocarbon reserves in this area. The...master thesis 1994
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Cordi, E. (author), Van Ophem, C. (author)Om de stroom van slib in water te bestuderen, werden verschillende proeven In het Laboratorium voor Vloeistof mechanica van de TU Delft uitgevoerd. De gebruikte vloeistof (een mengsel van kaoliniet en water) gekenmerkt door een rheologische non-Newtoniaan gedrag, zoals een Binghams vloeistof, stroomt op een bodem die een kleine helling vertoont....master thesis 1994