JournalTOCs

International Hydrographic Review
Number of Followers: 7

This is an Open Access Journal

Open Access journal
ISSN (Online) 0020-6946
Published by U of New Brunswick

[4 journals]

Measuring Water Levels by Handheld Smartphones
- Authors: Melanie Elias, Hans-Gerd Maas
  Pages: 9 - 22
  Abstract: Global climate change leads to an increase in local heavy rainfall events causing nearly unpredictable flash floods worldwide. This paper introduces a novel and flexible low-cost water gauging technology, called Open Water Levels, using smartphones as low-cost measuring devices enabling the crowdsourcing of water levels on demand with accuracies of a few centimetres. This merely requires smartphone camera images of a riverbank and approximate values of the camera position and rotation measured by smartphone sensors. The images are analysed for the water line that is further projected into object space and intersected with a 3D model, e.g. from a GIS database, to derive water level information.
  PubDate: 2023-05-02
Variance in the Accuracy of Tidal Levels with Increasing Data Length
- Authors: D. R. Metters
  Pages: 23 - 34
  Abstract: The Highest Astronomical Tide level (HAT) is derived from sea level datasets of sufficient length to encapsulate the lunar nodal cycle. HAT based on datasets of 35, 90, 180 and 400 days was determined for 14 sites. The difference between HAT based on short datasets and on 20-year datasets indicate that short datasets gave an average difference of 0.22 to 0.24 m. Increasing the length to 400 days decreased the difference to 0.06 m. Sites with diurnal form gave a larger difference of 0.4 to 0.9 metres. Inferring shallow water tidal constituents from the nearest longterm site reduced the difference to 0.15 to 0.19 m.
  PubDate: 2023-05-02
Improved Techniques to Resolve the Water Column Sound Speed Structure for
Multibeam Ray Tracing
- Authors: Jean-Guy Nistad, Patrick Westfeld
  Pages: 35 - 54
  Abstract: Multibeam bathymetry surveys conducted in highly stratified environments are routinely affected by sound speed errors. The approach proposed here aims to combine measured with synthetic sound speed profiles in order to minimize sound speed related depth measurement errors. The adequacy of synthetic profiles derived from a regional hydrodynamic model and spatiotemporal interpolation is therefore investigated. Ray-tracing comparisons at the 65 beam angle between measured and synthetic profiles demonstrate that the expected depth bias for modeled profiles will be in excess of 1% of water depth. Spatiotemporally interpolating hourly sampled profiles decreases the depth bias up to a factor of three for higher beam angles. Residual sounding depth biases are observed and ascribed to a residual surface sound speed error.
  PubDate: 2023-05-02
Characterization of Four Shipwrecks from 1741 in Cartagena Bay
- Authors: Diana Maria Quintana-Saavedra, Carlos Alberto Andrade-Amaya, Richard Guzmán-Martinez, Rafael Ricardo Torres-Parra, Pedro Javier Prada-Rueda
  Pages: 55 - 74
  Abstract: In 1741, the English Empire carried out a large-scale attack against Cartagena de Indias. To defend the city, the commanding officer Admiral Blas de Lezo strategically sunk several warships to form a line of defense and led the Spanish to ultimate victory. Through an analysis of historic documents and cartography, complemented with acquired field data, it was possible to locate and identify four anomalies that are, compatible with the warships, Conquistador, Dragón, África and San Carlos. This study contributes to defining conservation and preservation strategies of submerged cultural assets, a topic which Colombia must develop in the future.
  PubDate: 2023-05-02
Terminology of Hydrography - Relevant Terms and Concepts
- Authors: Lars Schiller
  Pages: 75 - 98
  Abstract: Which terms do hydrographers use in their communication' Which ones do they use particularly often' And which terms do exclusively exist because hydrography exists' With the methods of terminology science it is possible to systematically derive the terminology of hydrography. In this paper, I describe how terms can be collected and how concepts can be identified starting from the German language, how English equivalents can be assigned and how the terms can be made available in a terminology database. This paper is focused on describing the methodological approach, illustrated by selected examples. The methods could be transferred to other languages, but could also be used to update the IHO Hydrographic Dictionary, for example. First results suggest that the terminology of hydrography is not too extensive. In addition to the purely hydrography-exclusive terms, hydrographers also use numerous terms from other disciplines. However, hydrographers should at least know a few hundred concepts to be able to communicate competently. This paper also contributes to the debate on the term hydrospatial.
  PubDate: 2023-05-02
East Asia Hydrographic Commission Fifty Years of Progress
- Authors: Shigeru Nakabayashi
  Pages: 99 - 112
  Abstract: The year 2021 marks the 50th anniversary of the East Asia Hydrographic Commission (EAHC). It was established in 1971 as the third oldest Regional Hydrographic Commission located in East Asia. Since then, EAHC has progressed in cooperation of hydrographic services and in development of hydrographic technology for navigation safety and other aims. This article describing comprehensive historical steps and efforts of a Regional Hydrographic Commission in an important area of maritime transport will present readers a suggestive model of regional cooperation in hydrography. One of the suggestions can be summarized that the keys to development of Regional Hydrographic Commission are strong intention, initiative, unity and enthusiasm to leave no one behind.
  PubDate: 2023-05-02
The Participation of Women in Hydrographic Activity in Chile
- Authors: The Servicio Hidrográfico y Oceanográfico de la Armada de Chile- SHOA
  Pages: 113 - 119
  PubDate: 2023-05-02
Empowering Women in Hydrography - Safety First !
- Authors: Helen Stewart, Gretchen Imahori, Annie Biron, Sonja Bhatia
  Pages: 121 - 131
  PubDate: 2023-05-02
Beyond Hydrography
- Authors: Vincent Lecours, Amr Abd-Elrahman, Benjamin E. Wilkinson
  Pages: 133 - 141
  Abstract: Florida depends on the oceans, yet its waters have not been extensively mapped to the highest standards. While there is a need for marine spatial data for a wide range of applications and issues, there is also a need to develop data acquisition, processing, and analytical workflows and to integrate different surveying instruments that can capture the complex and extensive coastal environment – both above and below the waterline. This note provides an overview of the research performed by scientists at the School of Forest, Fisheries, and Geomatics Sciences, University of Florida, in the field of hydrography and marine geomatics.
  PubDate: 2023-05-02
COMREN International School on Hydrographic Surveying
- Authors: Sylvie Daniel, Ian Church, Denis Hains
  Pages: 143 - 149
  Abstract: The Canadian Ocean Mapping Research and Education Network (COMREN) aims to develop research activities, achieve technology transfer to industry, and develop and run educational programs. The International School on Hydrographic Surveying (ISHS) is the first training program proposed by the network. It was designed to provide participants with a multi-disciplinary training experience in close interaction with high-level scientists, professionals, and stakeholders from the hydrospatial environment. The 2021 edition of the school took place from October 25 to 29 at Université Laval with a set-up compliant with the pandemic conditions. This note highlights the main facts and outcomes about this training.
  PubDate: 2023-05-02
The End of Traditional Paper Charts: The Final Transition to Electronic
Navigational Charts
- Authors: Colby A. Harmon, E. J. Van Den Ameele
  Pages: 151 - 158
  Abstract: In late 2019, the United States’ National Oceanic and Atmospheric Administration (NOAA) started a five-year program to end production and maintenance of its traditional paper nautical charts and corresponding raster chart products and services. This decision was driven by many factors. These included the challenge of maintaining two separate nautical chart production systems, one for raster and one for electronic navigational charts (ENC); growing demand for more timely and more detailed nautical chart coverage; diminishing use of paper nautical charts; and greater acceptance and use of ENCs by commercial vessels and recreational boaters. NOAA is refocusing resources to provide higher quality, more up-to-date, larger scale (more detailed), electronic navigational chart coverage and other ENC-based products and services.
  PubDate: 2023-05-02
Editorial
- Authors: Patrick Westfeld
  Pages: 5 - 7
  PubDate: 2022-05-30