Envirtech S.p.A. Cap. Sociale Euro 500.000 i.v.
Italy 30175 Venezia Marghera (VE) 4/A, Via Pacinotti
Phone + 39 041 5313400 Fax +39 041 5313400
CCIAA VE 03852470107 - VAT: IT03852470107
Management
Italy 17031 Albenga (SV) 69/2, Via Patrioti
Phone + 39 0182 559643 Fax +39 0182 570976
Branches:
Italy 31020 Vidor (TV) , 6/8 Via Sartori
Italy 30030 Chirignago (VE) 2, Via S. Caterina
e-mail info@envirtech.org
web-site www.envirtech.com
This document or parts of it cannot be used for scopes not authorized by Envirtech SpA that will protect its
rights.
Envirtech SpA
Venice, 15th February 2011
Envirtech Code: 20003-SPE-200.0
TSU N AMI WARNING SYSTEM
Technical Specifications of
Surface Buoy
Tsunami Warning System Code 20003-SPE-200.0
Date 15/02/2011
Technical Specifications of
Surface Buoy Page 2 of 14
TABLE OF CONTENTS
1 SYSTEM OVERVIEW.....................................................................................................................................3
2 SB ARCHITECTURE.......................................................................................................................................4
3 SB FUNCTIONALITIES................................................................................................................................10
4 TECHNICAL DESCRIPTION.......................................................................................................................11
4.1.1 Ballast and Mooring line specifications.................................................................................................11
4.1.2 Buoy Frame specifications....................................................................................................................11
4.1.3 Day and Night Signalling devices..........................................................................................................11
4.1.4 Autonomous Power supply system.........................................................................................................11
4.1.5 Electronic Housing...............................................................................................................................12
4.2 SATELLITE MODEM....................................................................................................................................13
4.3 SURFACE ACOUSTIC MODEM......................................................................................................................13
5 SB COMPLIANT TABLE..............................................................................................................................14
Tsunami Warning System Code 20003-SPE-200.0
Date 15/02/2011
Technical Specifications of
Surface Buoy Page 3 of 14
1 SYSTEM OVERVIEW
The Tsunami Warning System (TWS) designed by Envirtech is composed of the following main
subsystems:
• an Underwater Module (UM) to be installed at the sea bottom in open sea location for the
accurate measurement of the tide and the identification of anomalous conditions.
• a Surface Buoy (SB) moored close to the UM to receive via acoustic link the measurement
of UM to be transferred via satellite link to a Data Centre (DC) for visualization and
analysis.
• a Data Centre (DC) on land composed of hardware and software infrastructures for the
reception via satellite link of the data of SB and UM to be displayed, stored and analysed.
ACOUSTIC LINK
SATELLITE LINK
UM
SB DC
Fig. 1.1 – Envirtech TWS Overview
The present document deals with the architectural, functional and performance specifications of
the Surface Buoy (SB).
Tsunami Warning System Code 20003-SPE-200.0
Date 15/02/2011
Technical Specifications of
Surface Buoy Page 4 of 14
2 SB ARCHITECTURE
The Surface Buoy (SB) system proposed is a SPAR buoy. Spar buoy is characterized by a tall and
thin configuration. It floats upright in the water and it is characterized by a small water plane and a
large mass. This configuration tends to be a stable ocean platform. Adjustment of the water plane
area and the mass allows spar buoys to be tuned so they tend to not respond to wave forcing.
The Envirtech SB is composed of 3 main parts:
- a subsurface pole;
- a buoyant (cone + cylinder) in the middle;
- a turret on the top.
The main advantages of this configuration for the specific applications are the following:
- the lower pole provide a reliable mechanical support of the acoustic modem and related
cable: the acoustic transducer can be mounted at least at 5-6m water depth to get a
reliable acoustic link.
- The buoyant can host on the top in the central part the battery and electronic unit with
related connectors.
- The turret on the top allows to mount the solar panels, the satellite modems and additional
devices like WiFi interface, meteorological station, etc.
- The hydrodynamic of the buoy proposed in characterised by small tilt movements: this
allows to get a vertical stable platform to optimise the performances of the acoustic link
between the buoy and the underwater module to get the data related to the tide and
tsunami detection.
A block diagram of the buoy proposed is reported in picture 2.1.
Tsunami Warning System Code 20003-SPE-200.0
Date 15/02/2011
Technical Specifications of
Surface Buoy Page 5 of 14
cd SB Architecture
BUOY FRAME WITH SIGNALING DEVICES
BALLAST
MOORING
LINE
ELECTRONIC UNIT
AUTONOMOUS
POWER SUPPLY
SUBSYSTEM
SATELLITE
MODEM
WLAN MODEM
GPS
RECEIVER
ACOUSTIC
MODEM
METEOROLOGICAL
STATIONS
HEADING &
TILT SENSOR
Fg. 2.1 – SB Block Diagram
It is composed of the parts reported in the following table
Device/Component/Part Description
Mooring Line and Ballast A line composed of a synthetic ropes,
mechanical accessories and 4 tons metal block
to anchor the buoy.
This parts requires a specific design taking
into account the depth and the meteo-
marine conditions of the specific
installation site.
Envirtech can provide the mooring line with
related design and dynamical analysis
results.