Monday, September 25, 2017
Published: Jul 2015

How to produce bathymetric products within one day after surveying.

The Port of Rotterdam is an open deep-water port in theriver estuary Maas. The location of the port in an estuarineenvironment necessitates maintenance dredging due tosiltation ’attacks’ from both tidal current and riverdischarge. Siltation from the sea, coming in during theflood tide and eroded materials from the hinterlandtransported in the river flow results in a total of 6.000.000m3 of maintenance dredging works in the port basinsevery year.

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  • Graph-1.jpg Dredging information based on difference of latest multibeam surveys and maintenance levels
  • SeaBat-7125SV2.jpg SeaBat 7125 SV2
  • Graph-2.jpg Weekly ENC production based on latest multibeam surveys
  • Laserscan-Data.jpg Combined 7K Multibeam – Laserscan data

Situation

The Port of Rotterdam is an open deep-water port in theriver estuary Maas. The location of the port in an estuarineenvironment necessitates maintenance dredging due tosiltation ’attacks’ from both tidal current and riverdischarge. Siltation from the sea, coming in during theflood tide and eroded materials from the hinterlandtransported in the river flow results in a total of 6.000.000m3 of maintenance dredging works in the port basinsevery year.

To control the dredging activities the Port of Rotterdamconducts hydrographic surveys on a daily basis. Two

purpose built survey vessels are operated by the AssetManagement department of Port of Rotterdam.

The survey vessels are equipped with Teledyne RESONSeaBat multibeam echosounders (model 7101 and 7125),RTK GNSS positioning and silt density equipment (Silas-Odom CV2).

Challenge

Continuous multibeam surveys result in large datavolumes and processing time. The goal of the Asset

Management Department is to produce bathymetricproducts within one day after surveying. Products are:

• Bathymetric paper chart for vessel traffic management

(VTM) and dredging operations

• Electronic Navigation Chart (ENC) for portable

pilotunits (PPU)

• ASCII gridded data sets for dredging equipment andGIS

analysis

Shipping, berth occupancy, satellite blocking by cranes orcontainer stock piles, sea water mixtures and fluid mudbottoms are a continuous threats to the quality andproduction rate of the bathymetric surveys. To save processing time the Asset Management Department try tokeep up the ‘first time yield’ level. This process starts withhigh quality raw multibeam data input. Cleaning datafilters will run faster and more accurate based on almostclean raw data obtained from the best available surveyequipment

Survey operations

Typical port hydrographic surveys contains locations withslopes, various bottom types and man-made constructionsin a relatively small area requiring the use of an all-roundmultibeam echosounder system that provides:

• Wide beam coverage to get depth data as close as

possible to water level on slopes

• Single transducer head (complexity and datareduction)

• Excellent object detection

• Variable pulse length settings to optimize acoustics for

fluid mud bottoms

• High update rate for survey speed up to 10 knots

• Side scan option

The Seabat 7101 and 7125 meets all the requirementsmentioned above. The data quality is very good hence

hardly any data cleaning is necessary post survey. Thebeam selection settings (to set area of interest) and systemdisplays are features that make these systems particularlyuser friendly.

Results

Since the end of 2012 the Asset Management departmentof the Port of Rotterdam developed a range of efficiencyefforts to reduce the need for survey personnel andequipment. These efforts resulted in a reduction of abouthalf a survey vessel, representing a cost saving ofapproximately €150,000 per year; in part due to theupgrade of the muliteam systems to the Teledyne RESONproducts mentioned above.

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Introducing Teledyne Marine Multibeam Echosounder and Sonar Solutions

Teledyne Marine is a leading provider of advanced multibeam echosounder and sonar solutions servicing a variety of markets and applications. By delivering the most advanced acoustic technology solutions Teledyne Marine provides high resolution, accurate, dependable, long lasting solutions to our customers.

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page 16

Implementation of a Multibeam Echosounder and Terrestrial LiDAR in Support of a Dam Spillway Construction Project

Nestled Northeast of the city of Folsom, California, sits the 11,450-acre Folsom Lake—formed by an existing dam on the North Fork and South Fork of the American River. It is responsible for providing irrigation, drinking water, and electricity to parts of California, as well as flood prevention for the areas situated south of the lake. Despite the low risk of a damaging occurrence, it was decided (under the Reclamation Safety of Dams Act) that preventive measures needed to be taken to protect those living downstream. Construction of a new auxiliary spillway is in progress, which will provide a means for a steady water outflow during an increased water flow event. Carried out in phases, this project requires surveys from land and water to ensure successful completion. The $900-million cooperative project between the U.S. Army Corps of Engineers, U.S. Department of the Interior, and Bureau of Reclamation will assist the Sacramento region to achieve the 200-year level of flood protection.Completion of the auxiliary spillway is scheduled for late 2017.

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Data•Xchange Delivers

AML Oceanographic’s recently released WiFi & GPS device, Data•Xchange, is saving time for hydrographers around the world by transferring and exporting data wirelessly and automatically.

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page 34

HYPACK Inc.: Experts in Hydrographic Software

HYPACK, Inc. has been a world leader in software development for the hydrographic and dredging industry since 1984. HYPACK® is the most widely used hydrographic software package with over 10,000 users worldwide. It provides everything necessary to fulfill your singlebeam, side scan, and multibeam survey requirements. This is why?

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page 40

New Algorithm for Multibeam Imagery Processing

Over the past years, multibeam echo sounders are increasingly being used not only to obtain water depth information, but also to record backscatter response. This information recorded by the sonar is very useful in studies on marine geology (Anderson et al., 2008; Harahap et al., 2010), underwater works and military applications, as it is possible to relate the acoustic intensity response with ocean floor properties(Applied Physics Laboratory, 1994; Eleftherakis et al., 2012; Huang et al., 2011).

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LOW-LOGISITICS MARINE SYSTEMS ENABLE NEW APPROACHES TO SURVEY

Unmanned maritime vehicles (UMVs) have been under development for decades. Since the late 1990s, several systems have evolved beyond research labs and have become commercial realities. These tools are now in routine use for scientific, commercial and military applications.

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