1,720,952 research outputs found
Some considerations about scales for coastal models with movable bed
No full textStarting from the increase of the bed shear of a uniform flow due to wave motion, a tranport formula for waves and current has been derived. With this transport formula scale relations have been drived for models in which material transport, under combined influence of waves and current has to be reproduced.Civil Engineering and Geoscience
Flow-induced gate vibrations: Prevention of sef-excitation computation of dynamic gate behaviour and the use of models
No full textThe objective of this study is to develop design criteria for the dynamic behaviour of gates and valves. To this end, a resume of existing theories is given as well as an extended analysis of the added water mass, hydrodynamic rigidity and damping (also negative damping or self-excitation) and excitation by turbulent flow. New computation methods are presented for self-exciting vibrations: The ensuing introduction of an instability indicator permits the prediction of such vibrations in the design phase. Methods are described to calculate the added water mass and water damping in flowing water. Also treated are the instability of overflowing and falling water nappes, the response of a mass-spring system to noise excitation by turbulence, and the technique of hydroelastic models. Prior publications by the author on these subjects are to be found in the Appendices.Hydraulic EngineeringCivil Engineering and Geoscience
Manuscripten van H.J. Schoemaker uit de periode 1946-1971: Deel C: Getijden, Getij-reproductie en Getij-analyse
No full textC1: Getijstromen in zee (1962) C2: Roterende coördinatiesystemen; centrifugale kracht en Coriolis-kracht1 (1958) C3: Invloed van aardrotatie bij waterloopkundig onderzoek² (1958) C4: Roterende cylinder in een parallelstroom tussen twee evenwijdige wanden (1958) C5: Reproduction of geostrophic effects in hydraulic models by means of the Magnus-effect of rotating cylinders (1964) C6: Harmonic analysis of tides; essential features and disturbing influences (1966)Hydraulic EngineeringCivil Engineering and Geoscience
Manuscripten van H.J. Schoemaker uit de periode 1946-1971: Deel D: Golven van het wateroppervlak
No full textD1: Golven van het wateroppervlak, grondformules in eerste benadering (1956) D2: Golfvervorming door wind; overzicht van de ontwikkelingen tot 1955 (1955) D3: Second-order effects in progressinve surface waves (1961) D4: Golven in stromend water (1960) D5: Diffractie (1950) D6: Investigations of the reflection of waves (1949)Hydraulic EngineeringCivil Engineering and Geoscience
Manuscripten van H.J. Schoemaker uit de periode 1946-1971: Deel B: Stroming in buisleidingen en kanalen
No full textB1: Grondvergelijkingen van de hydrodynamica (1957) B2: Met de tijd veranderlijke stromen (1958) B3: Waterslag¹ (1959) B4: Waterslag, samendrukbare vloeistof in slappe buis met variërende doorsnede (1958) B5: Geleidelijk veranderde beweging in kanalen volgens Boussinesq (1968) B6: Geleidelijk veranderlijke beweging met zijdelingse aan- en afvoer (1966) B7: Hellende goten (1966)Hydraulic EngineeringCivil Engineering and Geoscience
Monografieën irrigatie f18 en f19: Algemeen
No full textCivil Engineering and GeosciencesHydraulic Engineerin
Manuscripten van H.J. Schoemaker uit de periode 1946-1971: Deel E: Golfopwekking in golfbassins
No full textE1: Golven opgewekt in water van constante diepte door bewegende lichamen (1963) E2: Afwijking in de gewenste golfvorm door variërend toerental van de golfmachine (1958) E3: Golmachine “De Slang” (1958) E4: Slang-golfopwekker (1962) E5: Watercirculatie ondiepwater stuurvijver (1962)Hydraulic EngineeringCivil Engineering and Geoscience
Manuscripten van H.J. Schoemaker uit de periode 1946-1971: Deel A: modeltechniek
No full textA1: Scope and aims in model technique (1963) A2: Some pitfalls in scaling hydraulic models (1969) A3: Kengrootheden en dimensie-analyse (1965)Hydraulic EngineeringCivil Engineering and Geoscience
Manuscripten van H.J. Schoemaker uit de periode 1946-1971: Deel G: Diversen
No full textG1: Verband tussen Fourier-reeks en Fourier-integraal (1959) G2: Isoklinen en Isobachen (1957) G3: Berekening van coëfficiënten in exponentiële functies (1960) G4: Groei van een delta (1958) G5: Influence of bottom roughness on current patterns in freesurface flow (1958) G6: Virtuele massa bij golfklappen en daarop volgende trillingen in een constructie (1963) G7: Rating of screw-type current meters (1963)Hydraulic EngineeringCivil Engineering and Geoscience
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