78640 - MONITORING AND POSITIONING IN OFF-SHORE ENGINEERING

Scheda insegnamento

Anno Accademico 2018/2019

Conoscenze e abilità da conseguire

This course provides theoretical and operatives knowledges concerning the monitoring and positioning aspects in the offshore engineering. In particular, different techniques for an accurate positioning based on GNSS technology will introduced both for monitoring of off-shore structures and for geolocalization of off-shore infrastructures. Examples of real applications regarding the monitoring or the positioning of offshore structures will be discussed.

Programma/Contenuti

Language: English

Preliminary required knowledges

For this course some basis on survey and geodesy are required. Typically these background will be given during the courses of geomatics or topography or survey at the bachelor degree level.

Monitoring and positioning in off-shore Engineering

Module 1 (32 hours) – Prof. Stefano Gandolfi

Basic on geodetic reference frames (global reference frames, local geodetic reference frames)

Basic on GNSS technique:

  • single point positioning using pseudorange measurements (how GNSS works for location aspects),
  • GNSS for precise positioning (GNSS for monitoring and high precision positioning)
    • Relative positioning: phase differential GNSS approach
    • Precise Point Positioning approach
    • SBAS and Augmentation Systems

      Basic of classical spirit levelling and high accuracy spirit levelling for monitoring applications

      Data Analysis:

  • Post processing of time series: from measurements to data interpretation
    • Periodical signal detection
    • Discontinuity detection
    • Mean velocity detection
    • Noise characterization
  • Post processing Adjustment for strain network and spirit levelling

    Topographical survey in off-shore yards: geomatics for as-build application and for off-shore HSE

    Module 2 (16 hours) – Prof. Luca Vittuari

    Basic of Positioning

  • Satellite-based positioning:
    • to support on-shore and off-shore geophysical prospecting and bathymetric single/multi-beam surveys;
    • to place at the design position offshore drilling rigs
    • for the laying of pipelines along the design tracks
  • Positioning by means of integrated sensors and underwater positioning
    • Dynamic positioning of supply vessels;
    • SBL (Short Base Line), and LBL (Long Base Line) acoustic positioning systems;
    • Underwater control networks

On-shore monitoring of vertical movements of the soil

Testi/Bibliografia

The teacher upload the personal notes on the AMS Campus Web pages.

Metodi didattici

The course is composed by frontal lessons and practice (outdoor and in laboratory.

In particular the course is generally composed by:

  • 80% of frontal lessons
  • 20% of practice (outdoor and in laboratory)

Modalità di verifica dell'apprendimento

The exam is mainly written and composed by 5/6 questions. Than, starting from the obtained grade is possible to have an oral section that can increase the final grade within 3 points.

 

The evaluation will be based on different aspect related to:

1) capability to identify the best methods and instrumentations for the case study

2) Knowledge of the methods and tecniques usefull for the case study

3) Capability to apply statistical tests for minimum movement detection.

4) Capability to estimate the real accuracy obtained by a topographical survey using the statistical law of the variance/covariance propagation in non linear multidimensional functions

Strumenti a supporto della didattica

In order to support the classical frontal lessons in the classroom, some practical exercises will be performed both in outdoors and in the laboratory.

In particular:

Practices (outdoor)

  • Survey of a small network using spirit leveling.
  • Survey of a geodetic network using GPS static approach.
  • RTK and NRTK survey practice
  • TLS survey (if available)

Data analysis (laboratory)

Data Processing of the acquired data during the practices (in outdoor)

Orario di ricevimento

Consulta il sito web di Stefano Gandolfi

Consulta il sito web di Luca Vittuari