Wellenbelastung und Stabilitat hydraulisch gebundener Deckwerke

Many sea dikes along the coast of the North Sea are protected against wave loading and currents by riprap revetments that are grouted with mortar. The mortar bonds the individual stones of the top layer, thereby forming a coherent structure that is able to withstand normal forces and shear forces as well as momentums, thus leading to a planar...

Stone Stability under Stationary Nonuniform Flows

A stability parameter for rock in bed protections under nonuniform stationary flow is derived. The influence of the mean flow velocity, turbulence, and mean acceleration of the flow are included explicitly in the parameter. The relatively new notion of explicitly incorporating the mean acceleration of the flow significantly improves the...

Interface stability of granular filter structures under currents

Granular filters are used for protection of structures against scour and erosion. For a proper functioning it is necessary that the interfaces between the filter structure, the subsoil and the water flowing above the filter structure are stable. Stability means that there is no transport of subsoil material through the filter to the water above...

Riprap stability on the inner slopes of medium-height breakwaters

Medium height breakwaters are subjected to a considerable amount of overtopping. This implies the armour on the inner slope has to stable against overtopping waves. Existing equations do lack some basic understanding of the process of starting up movement of rock on the inner slopes. In order to get more insight into this phenomenon a special...

International Riprap workshop, theory, policy and practice of erosion control using riprap, armour stone and rubble

J. Aguirre-Pe, R. Fuentes - Stability and weak motion of riprap at a channel bed A.F. Ahmed, F. EI-Gamal, M.M. Gasser - Deterministic and probabilistic design approaches of riprap as bank protection J.P. Ahrens - Design considerations for dynamic revetments G.J. Akkerman, E. Berendsen - Experimental validation of stability criteria for the...

Taluds van losgestorte materialen: Stabiliteit van lage dammen en overgangsconstructies bij stortsteen onder golfaanval, deel V, verslag modelonderzoek

Dit verslag beschrijft de stabiliteit van een aantal stortsteenkonstrukties die afwijkt van een recht doorgaand talud zonder overslag . De konstrukties zijn dammen met een lage kruin, geknikte stortsteen taluds en stortsteen taluds met een glad boventalud. Uitgangspunt daarbij zijn de resultaten van M 1983 deel I (twee stabiliteitsformules) en...

Taluds van losgestorte materialen: Schaaleffecten in stabiliteit van grind- en stortsteen taluds onder golfaanval - Deltagoot onderzoek - deel IV

Het eerste gedeelte van het M1983 onderzoek bestond uit ongeveer 300 proeven op kleine schaal naar de statische stabiliteit van stortsteen taluds onder golfaanval. Het resultaat kon worden samengevat in twee nieuwe praktische stabiliteitsformules waarin de meest belangrijke parameters waren bijeengebracht (verslag M1983 deel I) . Het tweede...

Design of Roadside Channels with Flexible Linings

Flexible linings provide a means of stabilizing roadside channels. Flexible linings are able to conform to changes in channel shape while maintaining the overall lining integrity. Permanent flexible lining such as riprap, gravel, or vegetation reinforced with synthetic mat are suitable for hydraulic conditions similar to those requiring rigid...

Taluds van losgestorte materialen, dynamische stabiliteit van grind- en stortsteentaluds onder golfaanval. Model voor profielvorming. Verslag modelonderzoek

Dit verslag bevat het tweede gedeelte van een uitvoerig fundamenteel onderzoek naar de stabiliteit van taluds van losgestorte materialen onder golfaanval. In het onderhavige verslag wordt voornamelijk de stabiliteit beschouwd van dynamisch stabiele storts teen taluds en grindstranden. Dynamische stabiliteit wordt gekenmerkt door het zich vormen...

Taluds van losgestorte materialen, dynamische stabiliteit van grind- en stortsteentaluds onder golfaanval. Model voor profielvorming

Dit verslag bevat het tweede gedeelte van een uitvoerig fundamenteel onderzoek naar de stabiliteit van taluds van losgestorte materialen onder golfaanval. In het onderhavige verslag wordt voornamelijk de stabiliteit beschouwd van dynamisch stabiele storts teen taluds en grindstranden. Dynamische stabiliteit wordt gekenmerkt door het zich vormen...

Riprap Stability Model Tests

I. Introduction and Background 11. Test Setup and Conditions 111. Presentation of Data IV. Results V. Conclusions Appendices 1. Definition of Terms 2. Photographs of Model Dike Section 3. Model Riprap Stone Analysis 4. Tables of Expected Percent Damage for Armor Stone with Unit Weights

Riprap Stability Versus Monochromatic and Irregular Waves

A three-phase study of riprap stabi1ity was conducted at the u.s. Army Coastal Engineering Research Center. Phase One was large-scale tests of riprap stability using monochromatic waves (Ahrens, 1975). Phase Two was small-scale tests of riprap stability that replicated the Phase One, large-scale tests at a 1:10 Froude scale (Broderick and Ahrens...

Riprap design for wind-wave attack, a laboratory study in random waves

In 1962 the Civil Engineering Research Association (CERA) sponsored laboratory tests which resulted in the publication of a report (1) giving design procedures for determining the riprap size required for given design wave conditions. the CERA work represents one of the first attempts to rel.te the results of tests using regular waves to those...

Tentative Design Procedure for Riprap-Lined Channels: Field Evaluation

The objective of NCHRP Project 15-2 has been to establish criteria and develop procedures for the design of armored channels. The first phase of the project resulted in NCHRP Report 108, "Tentative Design Procedure for Riprap-Lined Channels" (1), which describes procedures for designing such channels and proportioning the riprap so as to...

Laboratory investigations of rubble-mound breakwaters

This paper reports on a laboratory investigation conducted at the United States Army Engineer Waterways experiment station, Vickburg, Mississippi, to determine criteria for the design and construction of rubble mound breakwaters. Small-scale breakwater sections are hand-constructed in a concrete wave flume 119 ft long, 5ft wide, 4 ft deep, and...