| Titre : |
Fisheries sonar : incorporating underwater observation using sonar |
| Type de document : |
texte imprimé |
| Auteurs : |
Mitson, R.B., Auteur |
| Editeur : |
Fishing news books ltd |
| Année de publication : |
1983 |
| Importance : |
287 p. |
| Format : |
25 cm |
| ISBN/ISSN/EAN : |
978-0-85238-124-3 |
| Langues : |
Français (fre) |
| Index. décimale : |
639 Chasse et pêche commerciales, protection de la faune et la flore |
| Résumé : |
Interest in the rivers, seas and oceans and what goes on under water has grown rapidly in the past deqde or two, and in many countries a large amount of money is spent in oceanographical and fisheries work of great variety. Some of this interest arises from the difficulties which traditional fisheries are meeting nowadays and the need to obtain more food from the sea, while at the same time fish stocks are in danger of serious depletion; some arises from the needs of communications, eg ships and cables, and from civil engineering; some from the search for new supplies of oil and the routing and maintenance of pipelines; there are military and naval needs, the operation of long range submarines and weapons and so on; and some of the interest arises from human curiosity - the need to understand our environment, which is inborn to intelligent humans. Doubtless these interests have varying relative importance in different countries and this is outside the scope of this book.
Although there has been an enormous expansion in ocean activity in the United States, Japan and Russia, British efforts have not expanded in the same way. Britain, as a maritime nation with a long tradition of commercial, naval and fishing activity, has a long-standing interest in the study of the oceans, and was indeed a pioneer in the systematic and scientific approach to it. However, the British fishing industry is not a large one, being in the third division of the world fishing league; its total catch was about 824016 tonnes in 1980. Japan and Russia land over 25 times as much fish by weight. Nevertheless, the British work in oceanography and fisheries has been important and its present scale forces concentration on matters of real significance. In Britain the Fisheries Laboratory at Lowestoft, the Marine Laboratory at Aberdeen, the Institute of Oceanographic Sciences and numerous smaller laboratories operated by universities and research associations have contributed in various ways to advances in marine and engineering science, as have their counterparts in other countries.
An examination of the programmes and achievements of these various bodies will quickly show that a large proportion of their effort is devoted to developing means of gathering information about what goes on under water. Not only does the progress of research itself depend on this, but also, nowadays, the everyday activity of marine operations. Fishermen expect to be able to obtain information from their instruments about what there is in and under the sea, so do navigators, submariners, divers and others. No longer is reliance on local knowledge and long experience considered adequate.
Although this book is primarily concerned with acoustic systems of gathering information in fisheries operations and research, we must continue the process of putting things into perspective by examining the various kinds of information which are needed under water, the ways in which it may be obtained, and some of the engineering principles involved. |
Fisheries sonar : incorporating underwater observation using sonar [texte imprimé] / Mitson, R.B., Auteur . - Fishing news books ltd, 1983 . - 287 p. ; 25 cm. ISBN : 978-0-85238-124-3 Langues : Français ( fre)
| Index. décimale : |
639 Chasse et pêche commerciales, protection de la faune et la flore |
| Résumé : |
Interest in the rivers, seas and oceans and what goes on under water has grown rapidly in the past deqde or two, and in many countries a large amount of money is spent in oceanographical and fisheries work of great variety. Some of this interest arises from the difficulties which traditional fisheries are meeting nowadays and the need to obtain more food from the sea, while at the same time fish stocks are in danger of serious depletion; some arises from the needs of communications, eg ships and cables, and from civil engineering; some from the search for new supplies of oil and the routing and maintenance of pipelines; there are military and naval needs, the operation of long range submarines and weapons and so on; and some of the interest arises from human curiosity - the need to understand our environment, which is inborn to intelligent humans. Doubtless these interests have varying relative importance in different countries and this is outside the scope of this book.
Although there has been an enormous expansion in ocean activity in the United States, Japan and Russia, British efforts have not expanded in the same way. Britain, as a maritime nation with a long tradition of commercial, naval and fishing activity, has a long-standing interest in the study of the oceans, and was indeed a pioneer in the systematic and scientific approach to it. However, the British fishing industry is not a large one, being in the third division of the world fishing league; its total catch was about 824016 tonnes in 1980. Japan and Russia land over 25 times as much fish by weight. Nevertheless, the British work in oceanography and fisheries has been important and its present scale forces concentration on matters of real significance. In Britain the Fisheries Laboratory at Lowestoft, the Marine Laboratory at Aberdeen, the Institute of Oceanographic Sciences and numerous smaller laboratories operated by universities and research associations have contributed in various ways to advances in marine and engineering science, as have their counterparts in other countries.
An examination of the programmes and achievements of these various bodies will quickly show that a large proportion of their effort is devoted to developing means of gathering information about what goes on under water. Not only does the progress of research itself depend on this, but also, nowadays, the everyday activity of marine operations. Fishermen expect to be able to obtain information from their instruments about what there is in and under the sea, so do navigators, submariners, divers and others. No longer is reliance on local knowledge and long experience considered adequate.
Although this book is primarily concerned with acoustic systems of gathering information in fisheries operations and research, we must continue the process of putting things into perspective by examining the various kinds of information which are needed under water, the ways in which it may be obtained, and some of the engineering principles involved. |
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