RTK River Bathymetry in Africa

From Syledis and Tide Gauge to RTK GPS Water-level Corrected Survey
This article describes the installation of a hardware and software system for bathymetric surveys in the maritime part of the Congo River. The ‘Regie des Voies Maritimes’ (RVM) is a Congolese public administration in charge of an operational navigation river lane in the Congo maritime reach. The Congo River has the second lar­gest flow in the world and is 4,700km long. RVM maintains the conditions for commercial navigation in the so-called ‘maritime area’, from the mouth to Matadi harbour, over a distance of 150km. The estuary is the only maritime border of the Democratic Republic of the Congo (DRC), with... (read more)
2007-11-27 12:00:00

Pioneer for Space Geodesy

Hydro International interviews Reiner Rummel
The field of geodesy is undergoing a revolutionary change. The developments of the last few decades have altered the views and work of professional surveyors, researchers and developers immensely, think of GPS, INSAR but also the Gravity and steady-state Ocean Circulation Explorer (GOCE) mission carried out by the European Space Agency. Co-initiator of this mission that measures the gravity field from space, Professor Reiner Rummel, What is your biggest contribution to the science of geodesy? That’s difficult. I think my contribution to the Gravity and steady-state Ocean Circulation Explorer (GOCE) satellite mission would probably count as the biggest. I was... (read more)
2013-03-26 02:38:00

Introducing Capt. Skip Theberge

Although this is my second effort at contributing to the History column, I would like to use this issue’s column to introduce myself to the readership of Hydrointernational. As most of you know, I have accepted the somewhat audacious task of ‘editing’ the column so ably served by Admiral Steve Ritchie for many years. I came to being the new editor by way of Leeke van der Poel asking Captain Steve Barnum, the US Hydrographer, if he knew of anyone who might be interested in continuing the work of recording the history of our profession. Because of my interest in... (read more)
2008-07-04 12:00:00

Best Practices and Inspiring Bathymetric Lidar Projects

Bathymetric Lidar is a technique to capture geospatial data of coastlines and (shallow) waters. The method has the potential to facilitate the fast and efficient creation of hydrographic data. More and more users are turning to it to support many new and different applications. At Hydro International, we have selected a series of articles on this technique, ranging from case studies that zoom in on some challenging projects using bathymetric Lidar in combination with other survey methodologies, to in-depth articles focusing on the latest trends and developments relating to this hydrographic surveying technology. Acoustically Aided INS and Lidar Aerial mobile mapping using Lidar and GNSS-aided inertial navigation... (read more)
2018-06-26 11:07:44

Mean Rise in Sea Level

Comparing Tidal Observations in Tunisia
The Tunisian Naval Hydrographic and Oceanographic Center (TNHOC) has since 1999 maintained a tidal database through an in situ tide-gauge network along the Tunisian coast. The data collected so collected over the period 1999 to 2006 is compared with tidal data from 1946 to 1947 and the results presented in this article. The tidal network of the Tunisian Naval Hydrographic and Oceanographic Center (TNHOC) consists of floating gauges type OTTR16 and a bottom pressure-sensing instrument type YSI. The network is established mainly in the ports of Bizerte, La Goulette, Kélibia, Sousse, Sfax and Zarzis. The instruments are supervised weekly by... (read more)
2007-09-04 12:00:00

Australasian Hydrographic Society

East Australian RegionThe East Australian Region ran a very successful one-day seminar in Sydney on Monday 13 September 2010. The seminar was fully subscribed with 20 presentations given during the day. Presentations can be viewed on the Hydrographic Society webpage; www.ahs.asn.au.During the seminar, awards were given to various industry individuals and companies for their contributions to the ongoing support and development of our industry.West Australia RegionThe AHS (WAR) has been honoured by the IFHS to host HYDRO11. This international hydrographic conference will be between 7 - 11 November 2011 at the Esplanade Hotel, Fremantle. Due to other major international events... (read more)
2011-01-27 04:32:20

Integrating UAS and Multibeam Echosounder Data

Creating a 3D Landscape Model of a Gravel Quarry in Germany
Knowing the volume of material present in a gravel quarry can make the difference between profit and loss. A gravel quarry in Hartheim am Rhein, southwest Germany, is partially covered by artificial lakes. To determine the volumes of the above-water gravel dumping grounds and to map the bottoms of the lakes, high-precision data captured by an unmanned aerial system (UAS) was combined with multibeam echosounder data obtained by boat. Read the full article for a description of acquisition of the two types of data, how they were integrated and the benefits for the mining company. A gravel quarry is associated with diggers, rough... (read more)
2016-04-25 10:08:32

Searching for HMS Terror

Knowledge Gained in the Search for Franklin
“We know where the target is not located” is the only guaranteed result of any search expedition. This statement does not make for exciting headlines, however, the value of knowledge gained during the search itself and its many benefits to a variety of end-users, cannot be easily dismissed. The 2015 Franklin Expedition search coordinated by Parks Canada was the continuing multi-year, multi-partner effort that saw the discovery of HMS Erebus in September of 2014. In this article we will discuss the knowledge gained and multiple uses of the data collected toward our conclusion of verifying where HMS Terror is not... (read more)
2016-04-04 09:52:54

Bed Mobility in the Weser Estuary Turbidity Zone

Mud in its unconsolidated, highly dynamic, fluid state may complicate problems arising from other detection difficulties in estimating water depth in estuarine channels with mobile bed deposits. This study presents new results on riverbed mobility in the turbidity reach of the Weser estuary based on datasets from an Innomar sediment echo sounder (SES-2000) and combined fluid mud sampling. Many estuaries of the world are important waterways. A high sediment turnover leading to highly dynamic mud deposits and large bed-forms such as sub-aqueous dunes is a characteristic feature of tidal estuaries. Often their presence poses navigation risks due to considerable reduction... (read more)
2008-01-01 01:00:00

Bed Mobility in the Weser Estuary Turbidity Zone

Mud in its unconsolidated, highly dynamic, fluid state may complicate problems arising from other detection difficulties in estimating water depth in estuarine channels with mobile bed deposits. This study presents new results on riverbed mobility in the turbidity reach of the Weser estuary based on datasets from an Innomar sediment echo sounder (SES-2000) and combined fluid mud sampling. Many estuaries of the world are important waterways. A high sediment turnover leading to highly dynamic mud deposits and large bed-forms such as sub-aqueous dunes is a characteristic feature of tidal estuaries. Often their presence poses navigation risks due to considerable reduction... (read more)
2008-01-01 01:00:00
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