Sheet piling cofferdams and caissons

Design of steel cofferdams and caissons (diving wells); sinking pneumatic caissons; concrete caissons

Strömungvorgang und Kolkproblem am runden Brückenpfeiler

Objective of this study was to examine the interaction of flow regimen and scouring at round piers and to obtain simple relationships in order to give the planning engineer a clear and practice oriented method of calculation. The experiments were preceded by an intensive study of the literature and the theoretical treatment of the problem. The...

Analytical approach to some practical aspects of local scour around bridge piers

Local scour is one of the most important causes on bridge failures during floods, and recent changes of river environments makes it difficult to predict the scour depth and design an appropriate protection works. In this study, firstly an analytical model to describe scouring process around a pier has been derived based on reasonable...

Scour manual

Ontgrondingen rondom brugpijlers en aan de kop van kribben

Het doel van het handboek ontgrondingen is een antwoord te geven op ontgrondingsvraagstukken zoals een ontwerper van waterbouwkundige constructies die tegenkomt. Verschillende deelstudies worden voor het afronden van dit handboek uitgevoerd. Het verifiëren van ontgrondingsformuies staat centraal in deze studies. Hier is de voorspellingskracht...

De kolonisatie door flora en fauna van betonblokken op het zuidelijk havenhoofd te IJmuiden; Betonblokken als foerageergebied voor paarse strandlopers en steenlopers

De komende jaren is groot onderhoud gepland aan de beide havenhoofden bij IJmuiden. Hierbij zullen nieuwe betonblokken op de havenhoofden worden aangebracht. De havenhoofden behoren tot de vijf belangrijkste overwinteringsgebieden in Nederland voor de paarse strandloper. Deze soort foerageert op en tussen de betonblokken. Een grootschalige...

Hydraulic Structures: Caissons

Lecture notes CT3330. Introduction, history of caissons, construction of standard caisson, design of standard caisson, construction of pneumatic caissons.

Evaluating Scour at Bridges - Fifth Edition

This document is the fifth edition of HEC-18. It presents the state of knowledge and practice for the design, evaluation and inspection of bridges for scour. There are two companion documents, HEC-20 entitled "Stream Stability at Highway Structures", and HEC-23 entitled "Bridge Scour and Stream Instability Countermeasures". These three documents...

Falling aprons at circular piers under currents

Traditional guidelines on rock protection at circular piers predominantly focus on preventing shear failure (by choosing a sufficiently large rock size), winnowing failure (by designing an appropriate filter) and edge failure (by selecting a sufficient extent). In particular areas (e.g. in an eroding river channel or in an area with large-scale...

Detailed simulation of morphodynamics: 3. Ripples and dunes

We present a 3-D physics-based high-resolution modeling approach to the dynamics of underwater ripples and dunes. The flow is modeled by large eddy simulation on a Cartesian grid with local refinements. The sediment transport is modeled by computing pickup, transport over the bed, transport in the water column, and deposition of rigid spherical...

The Innovative Structure Solution for Preventing Salt Intrusion and Retaining Freshwater In Mekong Delta VietNam

In the Mekong Delta Vietnam, the construction of sluices with the purpose of retaining fresh water and preventing salt water intrusion potentially plays a very important role. However, the structures constructed in small rivers according to local or traditional technology revealed many disadvantages related to the economical, evacuation and...

Bodembescherming rond brugpijlers

Onderzoek naar de ontgrondingen rond brugpijlers met een focus op de ontrgronding rond de pijlers van de Waalbruggen in Nijmegen. Door het graven van een nevengeul ontstaat een andere hydraulische situatie waardoor de bescherming rond de pijler aangepast moet worden.

Lateral strength Of urm piers: comparison between codified criteria and in-plane test results

The lateral resistance represents one of the most significant wall parameters to be used in the seismic analyses for the design/assessment of masonry buildings. In this article, an investigation on in-plane lateral strength of URM piers has been proposed thorough a comparison between the results from codified criteria and the outcomes of several...

In-plane drift capacity at near collapse of rocking unreinforced calcium silicate and clay masonry piers

In recent years, seismic assessment of existing unreinforced masonry (URM) structures is being increasingly based on nonlinear methods. The in-plane displacement capacity represents one of the most crucial yet still debated features of the nonlinear behaviour of URM piers. International codes often employ empirical models to estimate the pier...

Development of a dataset on the in-plane experimental response of URM piers with bricks and blocks

In this paper, a dataset collecting the results of in-plane cyclic tests on unreinforced masonry piers, carried out within different research projects, is presented. The dataset includes brick and block walls with different materials, bed-and head-joint typologies, dimensions, boundary conditions and vertical applied loads. The development of...

Constructing a Mesh Model of the Construction for Finite Element Method (FEM) Simulation from the Point Cloud Data Collected by Terrestrial Laser Scanning (TLS)

In recent years, there has been a significant increase in inspecting and evaluating transport infrastructure. Traditionally, these structural data were collected manually by measuring and redrawing the construction against design documents. In recent decades, laser scanning technology can help collect 3D data rapidly and accurately. The 3D...