scholarly journals Field measurements and numerical modelling of infiltration and matric suctions within slopes

2002 ◽  
Author(s):  
Ηλίας Τσαπάρας
Keyword(s):  
Numerical Modelling ◽  
Field Measurements

Η διατριβή παρέχει μία ανάλυση των αρνητικών πιέσεων πόρων και των συνθηκών ροής νερού σε δύο πρανή από πλήρως αποσαθρωμένο έδαφος στη Σιγκαπούρη. Η ανάλυση βασίζεται σε μετρήσεις υπαίθρου ενός χρόνου και σε αριθμητική ανάλυση με χρήση πεπερασμένων στοιχείων. Οι μετρήσεις υπαίθρου αποτελούνται από μετρήσεις βροχής, απορροής και μεταβολής των αρνητικών πιέσεων πόρων σε διάφορα σημεία και βάθη των πρανών. Οι μετρήσεις δείχνουν ότι ο μηχανισμός εισροής νερού είναι πολύπλοκος και ότι οι πιέσεις πόρων μεταβάλλονται τόσο από την ποσότητα και ένταση της βροχής όσο και από τις αρχικές συνθήκες. Ο σκοπός της αριθμητικής ανάλυσης ήταν να συνδυάσει όλες τις πληροφορίες υπαίθρου σε ένα αριθμητικό μοντέλο. Η ανάλυση περιγράφει τον πολύπλοκο μηχανισμό εισροής νερού στο πρανές και επαληθεύει τον κύριο λόγο που έχουν οι αρχικές συνθήκες. Από την ανάλυση φάνηκε ότι το πρανές έχει περιορισμένη ικανότητα απορρόφησης νερού ανεξάρτητα του πόσο αυξημένη ή μειωμένη είναι η υδατοπερατότητα στην επιφάνεια του εδάφους. Το φαινόμενο εξηγείται με την υδραυλική ακτίνα και τις μεταβολές της με το χρόνο. Συμπερασματικά, μεγάλες ποσότητες νερού δεν οδηγούν αυτόματα σε μεγάλη εισροή.

scholarly journals Towards a turbulence characterization in tidal energy sites. First results of THYMOTE project

2019 ◽  
Vol 261 ◽  
pp. 05002 ◽  
Author(s):  
Sylvain Guillou ◽  
Jean-François Filipot ◽  
Jérôme Thiébot ◽  
Grégory Germain ◽  
Nicolas Chaplain ◽  
...  
Keyword(s):  
Free Surface ◽  
Numerical Modelling ◽  
Physical Modelling ◽  
Field Measurements ◽  
Tidal Energy ◽  
Turbulence Level ◽  
High Current ◽  
First Results ◽  
Tidal Turbine ◽  
High Turbulence

Tidal turbine will be installed in area with high current and high turbulence level. A characterisation of this last is required. The aim of the project THYMOTE is to characterize and understand the generation of eddies from smaller to several tens of meters. Three technics are used: Numerical modelling, Physical modelling, field measurements. Physical and numerical modelling show clearly the appearance of the eddies close to the bottom in presence of dunes or rocks and their motion towards the free surface.

scholarly journals Landfill side slope lining system performance: A comparison of field measurements and numerical modelling analyses

2014 ◽  
Vol 42 (3) ◽  
pp. 224-235 ◽  
Author(s):  
Katarzyna A. Zamara ◽  
Neil Dixon ◽  
Gary Fowmes ◽  
D. Russell V. Jones ◽  
Bo Zhang
Keyword(s):  
Numerical Modelling ◽  
System Performance ◽  
Field Measurements ◽  
Side Slope

scholarly journals Data Analysis and Numerical Modelling to Detect Hydrodynamics and Sediment Transport in a semi Enclosed Basin

10.29007/h936 ◽  
2018 ◽  
Author(s):  
Francesca De Serio ◽  
Elvira Armenio ◽  
Diana De Padova ◽  
Michele Mossa
Keyword(s):  
Sediment Transport ◽  
Numerical Modelling ◽  
Best Practice ◽  
Southern Italy ◽  
Numerical Models ◽  
Field Measurements ◽  
Current Field ◽  
Coastal Sea ◽  
Using Data ◽  
Current Monitoring

Current monitoring programs in the nearshore region are necessary to allow a thorough knowledge of coastline erosion as well as diffusion and dispersion of polluting tracers. Collecting a large amount of data in widespread areas is challenging, because of technical and economic limitations, thus numerical models are often preferred to simulate the hydrodynamics and the transport of tracers in extended areas with the desired level of precision. To be accurate, models need to be calibrated and validated by high quality field measurements. Therefore, to examine current and tracer patterns in a basin, using data and numerical modelling in conjunction could be the best practice. The aim of the present work is: i) to provide some information on the typical and recurrent processes occurring in a target basin, by analyzing a set of current field data; ii) to reproduce the principal current patterns and derive information on the possible sediment transport fluxes in the basin by applying mathematical modelling. The site selected for this study is a semi enclosed coastal sea, in southern Italy. The obtained results successfully confirm the typical hydrodynamic behavior of the basin, and delineate areas which are more exposed to erosion.

scholarly journals Design of ballasted railway track foundations using numerical modelling. Part II: Applications

2018 ◽  
Vol 55 (3) ◽  
pp. 369-396 ◽  
Author(s):  
Md. Abu Sayeed ◽  
Mohamed A. Shahin
Keyword(s):  
Numerical Modelling ◽  
Case Studies ◽  
Design Method ◽  
Field Measurements ◽  
Railway Track ◽  
Moving Loads ◽  
Practical Application ◽  
Field Case ◽  
Repeated Applications ◽  
Good Agreement

This paper is the second of two companion papers in relation to a new design method for ballasted railway track foundations. Development of the new design method has been explained in the first paper (i.e., Part I: Development), and the procedures for using the method and its practical application on some field case studies are presented in this paper. A special feature of the proposed design method is that it considers the true impact of train dynamic moving loads and number of repeated applications of the traffic tonnage. The proposed method is applied to four case studies of actual tracks and the results are compared with field measurements and found to be in good agreement. It should be noted that, although the proposed design method is able to overcome most shortcomings of the existing methods and found to provide excellent outcomes, further verification with more field case studies is highly desirable.

scholarly journals Numerical modelling of the hydrogeological and geomechanical behaviour of a large slope movement: the Triesenberg landslide (Liechtenstein)

2007 ◽  
Vol 44 (7) ◽  
pp. 840-857 ◽  
Author(s):  
B François ◽  
L Tacher ◽  
Ch. Bonnard ◽  
L Laloui ◽  
V Triguero
Keyword(s):  
Finite Element ◽  
Numerical Modelling ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Temporal Distribution ◽  
Field Measurements ◽  
Slope Movement ◽  
Three Dimensions ◽  
Hydrogeological Model ◽  
Modified Cam Clay

Using advanced hydrogeological and geomechanical finite element modelling, it has been possible to model the mechanical behaviour of a large slope movement, the Triesenberg landslide. This slope is located along the Rhine valley in the Principality of Liechtenstein and covers an area of around 5 km2, which includes two villages. Pore-water pressure fields calculated by the hydrogeological model were used as input for the geomechanical model. The results obtained through numerical simulation agree fairly well with field measurements of peak velocity, spatial and temporal distribution of velocity, and total displacements. Such results were obtained using a modified Cam-Clay elastoplastic constitutive model for which the required material parameters were obtained through careful geotechnical tests. These finite element models were carried out in two and three dimensions to gradually improve the understanding of the physical phenomena governing the hydrogeological conditions and the movements of the slope.Key words: landslides, slope movement, hydromechanical coupling, elastoplasticity, numerical modelling.

scholarly journals Effects of urban trees on local outdoor microclimate: synthesizing field measurements by numerical modelling

2015 ◽  
Vol 18 (4) ◽  
pp. 1305-1331 ◽  
Author(s):  
Yafei Wang ◽  
Frank Bakker ◽  
Rudolf de Groot ◽  
Heinrich Wortche ◽  
Rik Leemans
Keyword(s):  
Numerical Modelling ◽  
Field Measurements ◽  
Urban Trees
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