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Depth Measuring Techniques
EM 1110-2-1003 1 Jan 02 Chapter 9 Single Beam Acoustic Depth Measurement Techniques 9-1. General Scope and Applications Single beam acoustic depth sounding is by far the most widely used depth measurement technique in USACE for surveying river and harbor navigation projects. Acoustic depth sounding was first used in the Corps back in the 1930s but did not replace reliance on lead line depth measurement until the 1950s or 1960s. A variety of acoustic depth systems are used throughout the Corps, depending on project conditions and depths. These include single beam transducer systems, multiple transducer channel sweep systems, and multibeam sweep systems. Although multibeam systems are increasingly being used for surveys of deep-draft projects, single beam systems are still used by the vast majority of districts. This chapter covers the principles of acoustic depth measurement for traditional vertically mounted, single beam systems. Many of these principles are also applicable to multiple transducer sweep systems and multibeam systems. This chapter especially focuses on the critical calibrations required to maintain quality control in single beam echo sounding equipment. These criteria are summarized in Table 9-6 at the end of this chapter. 9-2. Principles of Acoustic Depth Measurement Reference water surface Transducer Outgoing signal VVeeloclocityty Transmitted and returned acoustic pulse Time Velocity X Time Draft d M e a s ure 2d depth is function of: Indexndex D • pulse travel time (t) • pulse velocity in water (v) D = 1/2 * v * t Reflected signal Figure 9-1. Acoustic depth measurement 9-1 EM 1110-2-1003 1 Jan 02 a. -
Early Maritime Navigation Unit Plan
EARLY MARITIME NAVIGATION UNIT PLAN Compelling How did advances in marine navigation, from the 13th century C.E. through the 18th century Question C.E., help to catapult Western Europe into global preeminence? C3 Historical Thinking Standards – D2.His.1.9-12. Evaluate how historical events and developments were shaped by unique circumstances of time and place as well as broader historical contexts. Standards C3 Historical Thinking Standards – D2.His.2.9-12. and Analyze change and continuity in historical eras. Practices Common Core Content Standards – CCSS.ELA-LITERACY.WHST.9-10.1.B Develop claim(s) and counterclaims fairly, supplying data and evidence for each while pointing out the strengths and limitations of both claim(s) and counterclaims in a discipline-appropriate form and in a manner that anticipates the audience's knowledge level and concerns. Staging the How do advances in marine navigation technology help nations develop and sustain world Question influence? Supporting Supporting Supporting Supporting Question 1 Question 2 Question 3 Question 4 Why has the sea been What is navigation and How does being posed How did STEM confer crucial to the fate of what special challenges with a challenge lead us to advantages to a society’s nations, empires, and does the sea pose to innovation and progress? ability to navigate the civilizations? travelers? world’s oceans? Formative Formative Formative Formative Performance Task 1 Performance Task 2 Performance Task 3 Performance Task 4 1) Look at the planet’s 1) In pairs ask your 1) Compass Lesson Plan 1) Drawing connections to physical geography, partner to draw you a (Lesson is located below the last three questions, all the Print Documents) build an argument that map from school to a view the Longitude video the sea was better at specific location in your Discover how the (07:05 min) connecting cultures town. -
Hydrographic Surveys Specifications and Deliverables
HYDROGRAPHIC SURVEYS SPECIFICATIONS AND DELIVERABLES March 2019 U.S. Department of Commerce National Oceanic and Atmospheric Administration National Ocean Service Contents 1 Introduction ......................................................................................................................................1 1.1 Change Management ............................................................................................................................................. 2 1.2 Changes from April 2018 ...................................................................................................................................... 2 1.3 Definitions ............................................................................................................................................................... 4 1.3.1 Hydrographer ................................................................................................................................................. 4 1.3.2 Navigable Area Survey .................................................................................................................................. 4 1.4 Pre-Survey Assessment ......................................................................................................................................... 5 1.5 Environmental Compliance .................................................................................................................................. 5 1.6 Dangers to Navigation .......................................................................................................................................... -
Cambridge University Press 978-0-521-76518-3 — the Making of the Modern Admiralty C
Cambridge University Press 978-0-521-76518-3 — The Making of the Modern Admiralty C. I. Hamilton Index More Information Index Accountant-General, 60; of the Navy Arbuthnot, Charles, 97–8 (from 1832): 65, 125, 138, 146, Army Staff, 222 189–93, 295 (see also estimates); Arnold-Forster, H. O., 198, 217 staff, 164, 188, 192 Asquith, H. H., 224 administrative board, 31 Assistant Secretary for Finance Duties Admiralty (see also Admiralty Office; (see also Secretariat), 192 Board of Admiralty; Childers, H. C. E.; Aube, H.-L.-T., 172 First and Second (Permanent) Auckland, George Eden, Earl of, 119, 134 Secretaries; Geddes, E.; Goschen, Awdry, Richard, 191, 201, 205 George; Graham, Sir James; ‘mob from the North’; Naval Staff; Navy Bacon, Sir Reginald, (Kt. 1916), 215 Board; Navy Pay Office; Principal Baddeley, Vincent, (Kt. 1921), 205, 206, 259 Officers; Private Office; Victualling Balfour, A. J., 237, 238 Board; Secretariat; Sick and Hurt Ballard, G. A., 222, 223 Office; Sixpenny Office; Transport Bank of England, 28 Office; War Staff): administration/ Barham, Lord, see Middleton, Charles policy divide, 266–7, 275, 279, 288, Barnaby, Nathaniel (Kt. 1885), 136, 162, 307; attacks on, 312; civil–military 173, 194–5 division in (see also Godfrey, John), Barrow, John (cr. baronet, 1835) (see also 68–9, 279, 289, 297–302, 313, 314; Second Secretary): 6, 12, 52, 57, 63; committees, 110–11, 120–3, 186–9, administration and policy of, 41, 51, 215; communications, 176, 220, 64, 68–9, 75, 93, 100–1, 103, 152, 248–50; demobilisation, 274, 276; 163; and Benthamism, 54; and development, 2–3, 23, 234–6; J. -
Memoirs of Hydrography
MEMOIRS 07 HYDROGRAPHY INCLUDING Brief Biographies of the Principal Officers who have Served in H.M. NAVAL SURVEYING SERVICE BETWEEN THE YEARS 1750 and 1885 COMPILED BY COMMANDER L. S. DAWSON, R.N. I 1s t tw o PARTS. P a r t II.—1830 t o 1885. EASTBOURNE: HENRY W. KEAY, THE “ IMPERIAL LIBRARY.” iI i / PREF A CE. N the compilation of Part II. of the Memoirs of Hydrography, the endeavour has been to give the services of the many excellent surveying I officers of the late Indian Navy, equal prominence with those of the Royal Navy. Except in the geographical abridgment, under the heading of “ Progress of Martne Surveys” attached to the Memoirs of the various Hydrographers, the personal services of officers still on the Active List, and employed in the surveying service of the Royal Navy, have not been alluded to ; thereby the lines of official etiquette will not have been over-stepped. L. S. D. January , 1885. CONTENTS OF PART II ♦ CHAPTER I. Beaufort, Progress 1829 to 1854, Fitzroy, Belcher, Graves, Raper, Blackwood, Barrai, Arlett, Frazer, Owen Stanley, J. L. Stokes, Sulivan, Berard, Collinson, Lloyd, Otter, Kellett, La Place, Schubert, Haines,' Nolloth, Brock, Spratt, C. G. Robinson, Sheringham, Williams, Becher, Bate, Church, Powell, E. J. Bedford, Elwon, Ethersey, Carless, G. A. Bedford, James Wood, Wolfe, Balleny, Wilkes, W. Allen, Maury, Miles, Mooney, R. B. Beechey, P. Shortland, Yule, Lord, Burdwood, Dayman, Drury, Barrow, Christopher, John Wood, Harding, Kortright, Johnson, Du Petit Thouars, Lawrance, Klint, W. Smyth, Dunsterville, Cox, F. W. L. Thomas, Biddlecombe, Gordon, Bird Allen, Curtis, Edye, F. -
So, How Deep Is the Mariana Trench?
Marine Geodesy, 37:1–13, 2014 Copyright © Taylor & Francis Group, LLC ISSN: 0149-0419 print / 1521-060X online DOI: 10.1080/01490419.2013.837849 So, How Deep Is the Mariana Trench? JAMES V. GARDNER, ANDREW A. ARMSTRONG, BRIAN R. CALDER, AND JONATHAN BEAUDOIN Center for Coastal & Ocean Mapping-Joint Hydrographic Center, Chase Ocean Engineering Laboratory, University of New Hampshire, Durham, New Hampshire, USA HMS Challenger made the first sounding of Challenger Deep in 1875 of 8184 m. Many have since claimed depths deeper than Challenger’s 8184 m, but few have provided details of how the determination was made. In 2010, the Mariana Trench was mapped with a Kongsberg Maritime EM122 multibeam echosounder and recorded the deepest sounding of 10,984 ± 25 m (95%) at 11.329903◦N/142.199305◦E. The depth was determined with an update of the HGM uncertainty model combined with the Lomb- Scargle periodogram technique and a modal estimate of depth. Position uncertainty was determined from multiple DGPS receivers and a POS/MV motion sensor. Keywords multibeam bathymetry, Challenger Deep, Mariana Trench Introduction The quest to determine the deepest depth of Earth’s oceans has been ongoing since 1521 when Ferdinand Magellan made the first attempt with a few hundred meters of sounding line (Theberge 2008). Although the area Magellan measured is much deeper than a few hundred meters, Magellan concluded that the lack of feeling the bottom with the sounding line was evidence that he had located the deepest depth of the ocean. Three and a half centuries later, HMS Challenger sounded the Mariana Trench in an area that they initially called Swire Deep and determined on March 23, 1875, that the deepest depth was 8184 m (Murray 1895). -
The Quest for Longitude
FOR IMMEDIATE RELEASE Press Contacts: Garland Scott, (202) 675-0342, [email protected] Esther French, (202) 675-0326, [email protected] Press Tour: Wednesday, March 18, 10:30 am Reservations requested, [email protected] New Exhibition—Ships, Clocks & Stars: The Quest for Longitude The solution to one of the greatest technical challenges of the eighteenth century Produced by the National Maritime Museum, Greenwich, London Proudly sponsored by United Technologies Corporation On exhibit March 19 – August 23, 2015 Washington, DC— For centuries, longitude (east-west position) was a matter of life and death at sea. Ships that went off course had no way to re-discover their longitude. With no known location, they might smash into underwater obstacles or be forever lost at sea. The award-winning exhibition, Ships, Clocks & Stars: The Quest for Longitude, produced by the National Maritime Museum in Greenwich, London, celebrates the 300th anniversary of the British Longitude Act of 1714, which offered huge rewards for any practical way to determine longitude at sea. The longitude problem was so difficult that—despite that incentive—it took five decades to solve it. Through extraordinary, historic materials—many from the collection of the National Maritime Museum—the exhibition tells the story of the clockmakers, astronomers, naval officers, and others who pursued the long "quest for longitude" to ultimate success. John Harrison’s work in developing extremely advanced marine timekeepers, which was vital to finally solving the problem of longitude, took place against a backdrop of almost unprecedented collaboration and investment. Featured in this complex and fascinating history are the names of Galileo, Isaac Newton, Captain James Cook, and William Bligh of HMS Bounty. -
TECHNICAL DEVELOPMENTS in DEPTH MEASUREMENT TECHNIQUES and POSITION DETERMINATION from 1960 to 1980 by Dave Wells and Steve Grant
“Charting the Secret World of the Ocean Floor : The GEBCO Project 1903-2003” 1 TECHNICAL DEVELOPMENTS IN DEPTH MEASUREMENT TECHNIQUES AND POSITION DETERMINATION FROM 1960 TO 1980 By Dave Wells and Steve Grant EXECUTIVE SUMMARY In this paper we describe the evolution during these two decades from simple single-beam echosounders using horizontal sextant fixing (near shore), and celestial sextant positioning interpolated by dead reckoning (offshore) to (a) (For depth measurement techniques) sidescan sonar, digital echosounders, the first (classified) SASS and Seabeam multibeam systems, and early satellite altimetry, and (b) (For positioning determination) a plethora of short and long range radio positioning systems, the Transit satellite positioning system, the early designs for GPS, long and short baseline acoustic systems, and (c) How these developments have since impacted the data available to GEBCO BIOGRAPHIES Dave Wells and Steve Grant worked together at the Bedford Institute of Oceanography for several years during the 1970s on some of the developments discussed in this paper, as part of the Canadian Hydrographic Service Navigation Group headed by Mike Eaton. Steve “retired” in 1996 but still works on a variety of hydrographic consulting and teaching projects. Dave “retired” in 1980 and again in 1998, but still teaches at three universities. INTRODUCTION During the period from 1960 to 1980, many remarkable advances were made in the technologies applicable to depth measurement and positioning at sea. Some of the initial technological developments dating from those two decades remain the basis for the most modern and effective bathymetric and positioning systems in use today. Others reached productive fruition earlier, and have since been supplanted. -
Save Our Ships! Navigation on the High Seas
Save Our Ships! Navigation on the High Seas Introduction Navigation is determining where you are and how to get where you're going. Navigation tools help you travel from one place to another efficiently and safely. Early sea navigation depended upon a mariner's ability to determine latitude by observing the height of the sun in daylight and the North Star and major constellations at night. Such observations were not exact and could be unreliable. Beginning in the 13th century, advancements in navigational tools and scientific methods made navigation more exact and travel by ship safer; however, by the early 18th century, ships still lost their way frequently, with sometimes disastrous results. In this problem- based lesson, students read about the Scilly disaster of 1707, determine its causes, and then choose and explain which navigational tools might have prevented the disaster. Objectives In this lesson, students: • identify the cause(s) of the Scilly naval disaster of 1707 • place the development of navigational tools in chronological order • problem-solve to figure out what navigational tools could have prevented the Scilly disaster • use their knowledge of navigational tools to answer the question “How did mariners use navigational tools to solve the challenges of early oceanic travel?” Materials • Navigational Tools Graphic Organizer • Scilly Naval Disaster of 1707 • Timeline of the Development of Navigational Tools • Navigational Tools Cards • scissors • tape © 2015 The Colonial  ƒoundation 1 Save Our Ships! Navigation on the High Seas Strategy 1. Ask students to think about the kinds of tools we have today to help us find our way when traveling. -
SHOVELL and the LONGITUDE How the Death of Crayford’S Famous Admiral Shaped the Modern World
SHOVELL AND THE LONGITUDE How the death of Crayford’s famous admiral shaped the modern world Written by Peter Daniel With Illustrations by Michael Foreman Contents 1 A Forgotten Hero 15 Ships Boy 21 South American Adventure 27 Midshipman Shovell 33 Fame at Tripoli 39 Captain 42 The Glorious Revolution 44 Gunnery on the Edgar 48 William of Orange and the Troubles of Northern Ireland 53 Cape Barfleur The Five Days Battle 19-23 May 1692 56 Shovell comes to Crayford 60 A Favourite of Queen Anne 65 Rear Admiral of England 67 The Wreck of the Association 74 Timeline: Sir Cloudsley Shovell 76 The Longitude Problem 78 The Lunar Distance Method 79 The Timekeeper Method 86 The Discovery of the Association Wreck 90 Education Activities 91 Writing a Newspaper Article 96 Design a Coat of Arms 99 Latitude & Longitude 102 Playwriting www.shovell1714.crayfordhistory.co.uk Introduction July 8th 2014 marks the tercentenary of the Longitude Act (1714) that established a prize for whoever could identify an accurate method for sailors to calculate their longitude. Crayford Town Archive thus have a wonderful opportunity to tell the story of Sir Cloudesley Shovell, Lord of the Manor of Crayford and Rear Admiral of England, whose death aboard his flagship Association in 1707 instigated this act. Shovell, of humble birth, entered the navy as a boy (1662) and came to national prominence in the wars against the Barbary pirates. Detested by Pepys, hated by James II, Shovell became the finest seaman of Queen Anne’s age. In 1695 he moved to Crayford after becoming the local M.P. -
Some Board of Longitude Instruments in the Nineteenth Century
SOME BOARD OF LONGITUDE INSTRUMENTS IN THE NINETEENTH CENTURY A.N. STIMSON National Maritime Museum, Greenwich, London A series of calamitous British disasters at sea occurred at the turn of the 17th century, many of which can be attributed to poor navigation compounded by inability to find longitude. Perhaps the most momentous was that of Sir Cloudsley Shovel's returning Mediterranean Squadron which was comprehensively wrecked on the Scilly Islands in 1707 with the loss of four large warships and nearly 2000 men.1 An increasing public outcry at this regular loss of life and keenly felt loss of trade revenue resulted in an Act of Parliament which was intended to improve the inadequate state of navigation by stimulating an answer to the seemingly impossible problem of finding longitude at sea. On 20th July, 1714 Queen Anne gave her assent to "A Bill for Providing a Public Reward for such Person or Persons as shall Discover the Longitude at Sea". £ 20,000, an enormous sum of money at that time, was to be awarded to anyone who could provide a practical solution of general utility which would enable a navigator to find his ship's position to within twenty geographical miles. Lesser sums were to be awarded for methods which produced less accurate results.2 To oversee the management of these awards and to judge the prac- ticability of the solutions proposed, the Act provided for a Board of Commissioners. This was composed of the best scientific and seafaring minds of the day in addition to the inevitable political appointments. -
SETTING COURSE a History of Marine Navigation in Canada Sharon A
TRANSFORMATION SERIES 14 COLLECTION TRANSFORMATION SETTING COURSE A History of Marine Navigation in Canada Sharon A. Babaian Transformation Series Collection Transformation “Transformation”, an occasional series of scholarly La collection Transformation, publication en série papers published by the Collection and Research paraissant irrégulièrement de la Division de la collec- Division of the Canada Science and Technology Museum, tion et de la recherche du Musée des sciences et de la is intended to make current research available as technologie du Canada, a pour but de faire connaître, quickly and inexpensively as possible. The series le plus vite possible et au moindre coût, les recherches presents original research on science and technology en cours dans certains secteurs. Elle prend la forme history and issues in Canada through refereed mono- de monographies ou de recueils de courtes études graphs or collections of shorter studies, consistent with acceptés par un comité d’experts et s’alignant sur le the corporate framework, “The Transformation thème central de la Société, « La transformation du of Canada,” and curatorial subject priorities in agri- Canada ». Elle présente les travaux de recherche origi- culture and forestry, communications and space, naux en histoire des sciences et de la technologie au transportation, industry, physical sciences and energy. Canada et questions connexes réalisés en fonction des The Transformation series provides access to priorités du Musée, dans les secteurs de l’agriculture research undertaken by staff curators and researchers et des forêts, des communications et de l’espace, des for the development of collections, exhibitions and pro- transports, de l’industrie, des sciences physiques et grams.