Ahmed Hamdi Mansi

Ahmed Hamdi Mansi
Politecnico di Milano | Polimi · Department of Civil and Environmental Engineering

PhD

About

50
Publications
19,476
Reads
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264
Citations
Citations since 2017
36 Research Items
256 Citations
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
Introduction
I like doing Engineering, and I am proud to be an Engineer. I study, analyze, process, and interpret geophysical data using self-developed codes. A researcher interested in Gravity data modelling, processing, and inversion, Satellite Gravimetry/Gradiometry (GOCE, GRACE, ...), Geoid, Height systems and transformations. A Geophysicist interested in processing, inversion and interpretation of Gravity, Seismic, Marine Controlled-Source Electromagnetic data, and GPR data.
Additional affiliations
September 2015 - February 2016
Politecnico di Milano
Position
  • Lecturer
Description
  • Applied Mathematics: VECTORS AND MATRICES, LINEAR SYSTEMS, FUNCTIONS OF ONE REAL VARIABLE, LIMITS AND CONTINUITY, DERIVATIVE & ITS APPLICATIONS, INTEGRATION, FUNCTIONS OF SEVERAL VARIABLES, DIFFERENTIABILITY, INTEGRATION OF FUNCTIONS OF TWO VARIABLES.
September 2015 - January 2016
Politecnico di Milano
Position
  • Instructor
Description
  • Introduction to MATLAB: Linear Algebra and Complex numbers, Manipulation of Matrices and String of characters, Data structure. Graphical windows.
September 2013 - January 2014
Politecnico di Milano
Position
  • Instructor
Description
  • Introduction to MATLAB: Linear Algebra and Complex numbers, Manipulation of Matrices and String of characters, Data structure. Graphical windows.
Education
September 2014 - January 2015
The University of Calgary
Field of study
  • Geomatics Engineering
November 2012 - January 2016
Politecnico di Milano
Field of study
  • Environmental and Infrastructural Engineering
March 2010 - April 2012
Politecnico di Milano
Field of study
  • Environmental and Land Planning Engineering

Publications

Publications (50)
Article
Full-text available
Within the modelling of gravity data, a common practice is the upward/downward continuation of the signal, i.e. the process of continuing the gravitational signal in the vertical direction away or closer to the sources, respectively. The gravity field, being a potential field, satisfies the Laplace’s equation outside the masses and this means that...
Article
The precise computation of the vertical gravitational attraction of the topographic masses (terrain correction) is still being studied both for geodetic and geophysical applications. In fact, it is essential in high precision geoid estimation by means of the well-known remove-compute-restore technique, which is used to isolate the gravitational eff...
Article
Full-text available
The computation of the vertical attraction due to the topographic masses, the so-called Terrain Correction, is a fundamental step in geodetic and geophysical applications: it is required in high-precision geoid estimation by means of the remove–restore technique and it is used to isolate the gravitational effect of anomalous masses in geophysical e...
Article
The determination of high-resolution geoid for marine regions requires the integration of gravity data provided by different sources, e.g. global geopotential models, satellite altimetry, and shipborne gravimetric observations. Shipborne gravity data, acquired over a long time, comprises the short-wavelengths gravitation signal. This paper aims to...
Article
Regional gravity field modelling by means of remove-compute-restore procedure is nowadays widely applied in different contexts: it is the most used technique for regional gravimetric geoid determination, and it is also used in exploration geophysics to predict grids of gravity anomalies (Bouguer, free-air, isostatic, etc.), which are useful to unde...
Article
This paper presents experimental, analytical and numerical investigations to evaluate the punching shear strength of concrete slabs incorporating a combination of recycled coarse aggregate (RCA) and crumb rubber (CR). Therefore, twelve different concrete mixes were designed with various substitution ratios of RCA and CR as a partial replacement of...
Article
Full-text available
We modelled crustal and lithospheric thickness variation as well as the variations in temperature, composition, S‐wave seismic velocity and density of the lithosphere beneath the Saharan Metacraton (SMC) applying an interdisciplinary three‐dimensional (3D) modelling. Regardless of the limited dataset, we aimed at consistent imaging of the SMC litho...
Article
Full-text available
We modelled crustal and lithospheric thickness variation as well as the variations in temperature, composition, S‐wave seismic velocity and density of the lithosphere beneath the Saharan Metacraton (SMC) applying an interdisciplinary three‐dimensional (3D) modelling. Regardless of the limited dataset, we aimed at consistent imaging of the SMC litho...
Presentation
Heuristic Algorithm to Compute Geodetic Height (h) from Ellipse Equation
Conference Paper
The use of unconventional water sources, e.g., reusing treated wastewater and drainage water, could be an important water source for agriculture irrigation in order to overcome the water scarcity in Egypt. In this study, the effect of using submerged biofilters on water quality in the Bilbeas drain as a case study of polluted drains in Egypt is inv...
Conference Paper
Rice straw is attractive as a fuel for heat and power generation. High amount of straw is generated annually from rice cultivation in Valencia. This amount could be converted to a valuable energy product such as gas through direct combustion, biogas from anaerobic digestion, syngas through gasification or in the form of liquid as bio-oil from pyrol...
Conference Paper
We studied the effects of using industrial steel solid wastes resulted from lathes to enhance the compressive strength of concrete. On average, 3-4 Kg/lathe of steel waste fibers are produced on a daily basis. Such steel waste can be recycled in order to mitigate its environmental hazards. Moreover, using it to reinforce concrete is a feasible and...
Conference Paper
Lightweight concrete that can be casted using lightweight cement, ultra-light aggregates, hollow sealed spheres made of ceramic and glass, clay bubbles entrapping air, foam material like polystyrene and recycled materials concrete has extreme importance in the construction industry. The weight of the cubes has reduced approximately 22, 26, and 27%...
Conference Paper
Full-text available
Soil improvement techniques have been widely used to enhance the engineering properties of weak soils that do not satisfy construction conditions, mainly in terms of bearing capacity. In our case, a weak soil classified as Lean Clay with Sand (AASHTO classification system) was improved adding Lime with different percentages in terms of weight of th...
Article
Full-text available
In this work, a record of 16 channels, with future channel spacing in the telecommunication standardization sector of the International Telecommunications Union G.694.1 (ITU-T G.694.1) for Dense Wavelength Division Multiplexing (DWDM) (i.e., 12.5 GHz), is simulated and tested. This work is done to realize a proposed high capacity DWDM-Passive Optic...
Poster
Full-text available
This research introduces and presents a new algorithm named “Trilateration Algorithm” to compute the Geodetic coordinates (ϕ, λ, h) of any point (P), given its Cartesian coordinates (xp, yp, zp) in reference to the geodetic ellipsoid. The algorithm is based on the new “Seta-Point Theorem” in the meridian plan, which defines a new deterministic Twi...
Presentation
Full-text available
The estimation of the sea currents circulation for semi-closed waterbodies by geodetic methods mandates to combine heterogeneous datasets. An attempt to compute the Red Sea currents circulation model exploiting a combination of heterogeneous datasets, i.e., the GOCE-based DIR-R5 and EGM2008 global geopotential models (GGMs), DTU13 altimetric gravit...
Presentation
Full-text available
Exploiting GOCE data to estimate sea geostrophic currents for Open Ocean has been a success due to the competent and cross-comparable spatial resolution of the open ocean structure and the resolution of GOCE. On contrary, exploiting GOCE data to properly estimate sea Geostrophic Currents for semi-closed waterbodies has been a great challenge becaus...
Poster
Full-text available
The estimation of sea currents circulation for semi-closed waterbodies is a challenge for GOCE because the spatial scales of their structures are smaller than both these of open ocean and the expected resolution of GOCE models. An attempt to compute the Sea currents circulation model for the Red Sea implementing the geodetic methods is made. Such a...
Article
Full-text available
This study presents a recent combined regional gravity field model over Egypt, developed by integrating satellite and terrestrial data via applying the remove-compute-restore (RCR) principle and the least-squares collocation (LSC) procedure. A high-resolution digital terrain model was exploited for the computation of the terrain and residual terrai...
Article
A 3D crustal density model for Egypt was compiled. It is constrained by available deep seismic refraction, receiver functions analysis, borehole, and geological data. In Egypt, seismic data are sparsely and irregularly distributed. Consequently, we developed the crustal thickness model by integrating seismic and gravity data. Satellite gravity dat...
Article
The gravity field and steady-state ocean circulation explorer (GOCE) satellite, successfully concluded its mission in October 2013 after collecting unprecedented gravity gradient measurements. Such GOCE data made it possible to improve the determination of the geoid over the Red Sea region. The performance of GOCE-based satellite-only global geopot...
Poster
Full-text available
Airborne gravimetry is becoming nowadays more and more important: it is used for the computation of high accurate local geoid modelling, for resource exploration activities, as well as for the study of different geophysical topics. The above-mentioned applications usually require different accuracies and spatial resolutions. In the current work we...
Article
Airborne gravimetry represents nowadays probably the most efficient technique to collect gravity observations close to the Earth's surface. In the 1990s, thanks to the development of the Global Navigation Satellite Systems (GNSS), which has made accurate navigational data available, this technique started to spread worldwide because of its capabili...
Article
The study of the discontinuity between the Earth crust and upper mantle, the so-called Moho, and of the lithospheric architecture in general, has several important applications in exploration geophysics. For instance, it is used to facilitate the inversion of seismic-related data, in order to obtain important information on the sedimentary layers o...
Presentation
Full-text available
The GOCE (Gravity field and steady-state Ocean Circulation Explorer) mission launched on March 2009 has successfully concluded its mission on October 2013 after collecting leading gravity gradient measurements. Such unprecedented GOCE data made it possible to improve the determination of the geoid over our study area, namely the Red Sea. The perfor...
Poster
Full-text available
Soil salinity is one of the essential factors limiting crop production in arid and semi-arid regions. Hence, mapping and monitoring such a factor is crucial for land and water resources management and consequently the improvement of agricultural production. The changes of soil salinity levels of the study area, i.e. Fayoum, Egypt, have been assesse...
Presentation
Full-text available
The determination of a high-resolution geoid in off-shore areas mandates integrating heterogeneous gravity data acquired by different sources such as; global geopotential models (GGMs), satellite altimetry, and shipborne gravimetric observations. On the one hand, the former is obtained exploiting satellite missions, e.g. CHAMP, GRACE, and GOCE, whi...
Presentation
Full-text available
A reliable density structure modelling is essential for a good lithospheric study that is, in turn, a milestone to understand the complex geodynamics of the study region. Achieving such a reliable model is limited by the availability of a high-quality regional gravity field developed merging together heterogeneous gravity data acquired by various o...
Poster
Full-text available
Land use/ land cover change analysis using satellite remote sensing data opens the opportunity to better understand transformations of the agro-ecological landscape at regional levels with a long term temporal perspective. The integration of this level of analysis with field experiments and local case-studies is fundamental to place the whole resea...
Article
Groundwater is an important source of fresh water and, consequently, its quality should be properly monitored. Different contaminants can be identified with different types of equipment and/or measurement procedures. Fuel oil contamination forms a “floating” layer over the water table, which has different electrical properties, therefore electromag...
Poster
Full-text available
The Kermadec-Tonga subduction zone is studied, starting from the CRUST1.0 and the SLAB1.0 seismic models, and inverting the ESA-GOCE gravity gradients to improve our knowledge of the whole area. More specifically, the CRUST1.0 Moho discontinuity is refined, and the subducting plate is modelled for thickness and density contrast, since SLAB1.0 provi...
Poster
Full-text available
Regional gravity field modelling by means of remove - restore procedure is nowadays widely applied to predict grids of gravity anomalies in exploration geophysics. Considering this application, due to the required accuracy and resolution, airborne gravity observations are generally adopted. In this work a procedure to filter and grid raw airborne o...
Article
Electromagnetic sounding methods represent one of the few geophysical techniques that can provide information about the state and the properties of deep continental crust and upper mantle. In particular, marine Controlled-Source Electromagnetic (mCSEM) method is being applied to offshore hydrocarbon exploration and providing encouraging results, as...
Article
In this paper we study the potential of symmetry attribute analysis applied to the phase component of electric feld observations of marine controlled-source electromagnetic data. The effectiveness of symmetry attribute analysis on the phase component of marine controlled-source electromagnetic data in detecting the boundaries of resistive layer(s),...
Data
Full-text available
Conference Paper
Full-text available
Electromagnetic (EM) sounding methods represent one of the few geophysical techniques that can provide information about the current state and properties of the deep continental crust and the upper mantle. This study investigates the sensitivity analysis of marine controlled source electromagnetic data (CSEM) to the model parameters, namely the fre...
Conference Paper
Full-text available
This study explores the comparison and the sensitivity analysis of Marine CSEM data with respect to the more important acquisition configurations (i.e., VED, HED, and TSEM), with different frequencies (i.e., 0.20 Hz, 0.48 Hz, 0.76 Hz, 1.04 Hz) based on 1D forward modelling. This analysis helps the interpreter to highlight the reliability of each ac...
Conference Paper
Full-text available
In this paper, we study the potential of the concept of symmetry attribute analysis applied to the phase component of the electric field observations of marine controlled source electromagnetic survey. The effectiveness of the symmetry attribute analysis of the phase measurements in detecting and delineating the lateral extents/boundaries of subsur...
Article
Full-text available
Underground caves bear a natural hazard due to their possible evolution into a sink hole. Mapping of all existing caves could be useful for general civil usages as natural deposits or tourism and sports. Natural caves exist globally and are typical in karst areas. We investigate the resolution power of modern gravity campaigns to systematically det...
Thesis
Regional gravity field modelling by means of remove-restore procedure is nowadays widely applied in different contexts, by geodesists and geophysicists: for instance, it is the most used technique for regional gravimetric geoid determination and it is used in exploration geophysics to predict grids of gravity anomalies. In the present work in addit...
Poster
Full-text available
The GAL (Galileo for Gravity) project, founded by the European GNSS Agency (GSA) in the framework of the FP7 Transport theme aims to study and develop a state-of-art methodology for the determination of precise and high-resolution gravity field models from strapdown kinematic airborne gravimetry. In this work, the procedure applied in the framework...
Poster
Full-text available
Gravity observations are a powerful means for detecting underground mass changes. The Italian and Slovenian Karst has a number of explored caves, several are also touristic due to their size (e.g. Grotta Gigante in Italy; Skocjianske Jame and Postojnska Jama in Slovenia). Just a few years ago another big cave was discovered by chance close to Tries...
Thesis
The work presented in this research aims to illustrate the processing steps done on the seismic data acquired in the area of Val Duron, Trentino Alto Adige, Italy. The output of the analysis is described and the adequate geological model is used for the geological interpretation of this seismic data. The geological model will be also used to explai...

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Projects

Projects (7)
Project
The Trilateration Algorithm is a new geometrical solution for the conversion of Cartesian coordinates (X,Y,Z) in ECEF into Ggodetic coordinates (B,L,h).
Project
The main goal of the proposed research project is compute high-accuracy and high-resolution geoid model for the Red Sea region. While, the secondary goal is to use the computed geoid in order to produce a high-resolution MDT model with and the final product of the proposed research is to estimate the geostrophic circulation in the Red Sea.