Systematisch onderzoek naar twee en drie dimensionale ontgrondingen

Samenvattend rapport van alle twee- en drie dimensionale ontgrondingsonderzoeken uit de periode 1960-1970 bij het Waterloopkundig Laboratorium in opdracht van Rijkswaterstaat. De informatie uit de onderzoeken M648 en M863 zijn in deze rapporten samengevat, evenals de resultaten uit M847. (3 delen).

Systematisch onderzoek bodembescherming: Invloed geometrie en aard van de verdediging bij driedimensionale ontgrondingen

Systematisch onderzoek bodembescherming: Invloed geometrie en aard van de verdediging bij tweedimensionale ontgrondingen

Scouring of a sand bed in front of a vertical breakwater

The scouring profile of a bottom consisting of movable material as this is formed in front of a vertical wall under influence of the standing wave against this wall is discussed. The form of this profile is different for coarse and fine material. In the case of fine material this material is moved in suspension by the mass transport currents...

Systematisch onderzoek bodembescherming: Invloed ruwheid bestorting

Ontgronding benedenstrooms van bodembeschermingen en drempels

Vergelijkende analyse van de meetgegevens van Breusers en Spaargaren en de ontgrondingsformules van beiden.

Time scale of two dimensional local scour

The time scale of local scour is of importance in many model studies of practical problems. The use of a time scale is justified by the similarity in experimental scouring holes under different conditions. A time scale is derived from experiments with a wide range of length scales, velocity scales and material scales. The influence of velocity...

Conformity and time scale in two-dimensional local scour

The conformity of local scour in experiments with non-cohesive bed material is studied for two-dimensional problems. A description of the flow pattern in the scour hole and development of the scouring process with time is given. The importance of the time scale in the design of structures where a temporary exposure of the bed to scouring effects...

Scour of flat sand beaches due to wave action in front of sea walls

The erosion of sand beaches due to oscillatory water particle motion of non-breaking waves can be of importance, particularly where such a beach is fronted by a sea wall supported on spread foundation. Laboratory study was conducted with natural beach sand; waves were generated mechanically. Geometric variables included the inclination of sea...

Marine studies for the design and construction of offshore pipelines

The design and construction of submarine pipelines involve s special investigations and studies to understand marine environmental conditions which affect the location, installation methods, and design techniques for undersea line s. The paper will discuss application of marine geology, oceanography and marine engineering studies to submarine...

Geleidelijke sluiting - V: De invloed van de vorm van een sluitgatdrempel op de ontgronding

The action of submerged jets on moveable material

Laboratory research on the effect of jets on erodible bed. Studies of scour hole shape. Includes measured data.

Geleidelijke sluiting: Nota bodemaantasting

Erosioni di fondo a valle di uno scarico

The note summarizes the study and the results of two series of experiments, carried out in the laboratory, on the erosion of the mobile bottom downstream of a drain (model). Confirming the degree of reliability of the method followed and the final results, the formulas deduced are applied to the underlying erosions found in two cases on...