Laszlo Nagy

Laszlo Nagy
Budapest University of Technology and Economics · Department of Geotechnics

MSc. PhD.

About

24
Publications
4,364
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
94
Citations

Publications

Publications (24)
Conference Paper
Full-text available
Investigation of a subject usually means that the tools of some field of study are used in order to obtain information. When similar disciplines, such as geotechnics and soil sciences are evaluating the same object, the diverse ways of collecting information leads to different conclusions. However, they study the same subject, only from distinct po...
Article
Full-text available
Flood protection dams rarely receive heavy water loads in the Carpathian Basin. It will take 3-5 years for the river flood to soak up the dikes. Heavy clays-especially the loose heavy clays-lose their water content after a long dry period, shrink and become cracks in the dike. Some of the cracks do not close when rewetted, leaving cracks that carry...
Article
This article is not available for publication.
Article
Full-text available
When it comes to flood protection, the established method is to use an impermeable material in dikes, to prevent seepage. This material is usually some type of clayey soil which is considered as watertight and erosion-resistant. Despite that, in many occasions not only seepage, but the failure of the dam occurred due to surface erosion, because dis...
Article
Flood damage poses a major threat to many countries across Europe. One of the most disadvantageous communities is Hungary, especially in view of the fact that 23% of the total area is situated on floodplain. 97% of this region is protected by flood control dikes and the remaining 3% is generally low-value zone. Through the decades different design...
Article
This paper is an extension of previous work which characterises soil behaviours using the grading entropy diagram. The present work looks at the piping process in granular soils, by considering some new data from flood-protection dikes. The piping process is divided into three parts here: particle movement at the micro scale to segregate free water...
Conference Paper
Full-text available
The Carpathian Basin covers an area of 330,000 km 2 in Central Europe, surrounded by geographic boundaries of the Carpathian Mountains, the Alps, the Dinarides and the Balkan Mountains. It is divided approximately in two halves by the rivers Danube and Tisza. Both rivers have two regular floods each year the early spring "icy flood" and the early s...
Conference Paper
Full-text available
Coefficient of permeability is known as the most variable soil property Its value can vary over an order of magnitude even in case of relatively homogenous layers. So determining this value is a complicated, complex engineering task. There is a vast number of laboratory and in situ tests to determine the permeability coefficient. Each method has it...
Article
Full-text available
The grading entropy concept can be adapted to the field of geotechnics, to establish criteria for phenomena such as particle packing, particle migration and filtering, through a quantified expression of the order/disorder in the grain size distribution, in terms of two entropy-based parameters. In this paper, the grading entropy theory is applied i...
Article
Full-text available
Gátak körülbelül ötezer év óta folyamatosan épülnek a földön. Számuk egyes becslések szerint megközelíti az 500000-t (csak Kínában több mint 80000 nagygátat tartanak nyílván, Svédországban 10000-t). A gátépítés tudománya folyamatosan fejlődött, az ismeretek bővülése lehetővé tette, hogy a nagygátak tönkremenetele már az 1980-as évekre lecsökkent eg...
Article
Full-text available
The grain size distribution of the material washed out from the piping under flood load, newer investigated earlier Using 20 samples originating from different places at Danube and Tisza rivers, the grading characteristics of these samples were investigated on the basis of some selected grain sizes and the uniformity gradients. Based on these inves...
Article
Full-text available
Grain size and grain distribution by size are dominant factors determining soil behaviour The shape and position of a grain distribution curve contain implicit information about the propensity of sand boiling or piping at flood conditions. The author used 104 grain distribution curves taken from 12 sand boil locations to study the relationship betw...
Article
Full-text available
Coefficient of permeability (k) values can be determined using a variety of on-site and laboratory methods. Indirect inference from the grading curve is a standard method used to determine the k factor of fine granular soil types [12, 13]. However, measurements and calculations may introduce inaccuracies in several ways - for instance, by ignoring...
Article
Full-text available
Egy ország árvízi veszélyeztetettségét sok mérőszámmal tudjuk bemutatni. Ilyenek a gátak hossza, a mentesített ártér te-rülete és az ország területéhez viszonyított aránya, az ártéren élők száma és azok aránya az ország lakosaihoz, a védett gazdasági érték és aránya a nemzeti vagyonhoz, az egyszeri elöntéssel járó kár és annak aránya a GDP-hez, a k...
Conference Paper
Full-text available
In Hungary a persistent period of severe droughts in the years from 1989 to 1996 resulted in serious cracking of flood dikes on the River Tisza-the main river draining the Great Hungarian Plain-and its tributaries. These dikes-some of them built a hundred years ago and enlarged from time to time under emergency conditions-mostly consist of clays of...
Article
Full-text available
This paper is a brief introduction on the determination of separate flood plain basins, the selection and determination of characteristic flood stages inducing typical economic impacts, and the principles of taking the safety factor or the probability of failure of the flood defences into consideration in flood risk mapping. The failure probability...
Chapter
Full-text available
Historical research covering the past 220 years has identified 1,245 dyke breaches in Hungary, including 556 cases where the length of the breach was known. During the past 50 years (1954-2004), the dominant type of failure has shifted from overtopping to hydraulic subsoil failure, due to the continuous heightening of the dykes.
Article
Full-text available
HungaryissituatedinthepartofEuropedrainedbytheDanube, inthedeepestpartofthehydrographic unit called the Carpathian Basin. Her territory covers 93000 km2 and represents 11.4% of the 817 000 km2 large Danube catchment. The Carpathian Basin is bounded to the west by the 2000- 3000 high ranges of the Alps, to the north and east by the Carpathian Range...
Article
Full-text available
Flood fighting activity in preceding centuries and systematic research conducted since 1995 have produced a collection of more than 2200 historical data regarding dike failures in the Carpathian Basin. (14, 15) Despite the gaps in and the frequent errors of historical data, the high number of dike breaches facilitatesstatisticalprocessing and the e...
Conference Paper
Full-text available
Hungary is situated in the part of Europe drained by the Danube, in the deepest part of the hydrographic unit called the Carpathian Basin. Her territory covers 93,000 km2 and represents 11,4 % of the 817,000 km2 large Danube catchment. The Carpathian Basin is bounded to the west by the 2000-3000 high ranges of the Alps, to the north and east by the...
Conference Paper
Full-text available
Problems: Construction and strengthening of flood levees in Hungary, having been continuously made during the past 150 years, followed, as much as possible, the original first track of the levee lines. It has turned out only recently that the original layout of the earthen structures crossed several areas of unfavourable subsoil condition. The main...
Article
Full-text available
Construction and strengthening of flood levees, having been continuously made during the past 150 years, followed, as much as possible, the original first track of the levee lines. Owing to the fact, that subsoil investigations and soil-mechanical analyses have only been made in the last 35-40 year, it turned out only recently that the original lay...

Network

Cited By