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Author: Robert S. Nunny
Publisher:
ISBN:
Category : Business & Economics
Languages : en
Pages : 300
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Book Description
Author: Robert S. Nunny
Publisher:
ISBN:
Category : Business & Economics
Languages : en
Pages : 300
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Book Description
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309083400
Category : Science
Languages : en
Pages : 137
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Book Description
Concerns over the potential ecological effects of fishing have increased with the expansion of fisheries throughout the marine waters of the United States. Effects of Trawling and Dredging on Seafloor Habitat describes how assessment of fishing impacts depends on gear type, number and location of bottom tows, and the physical and biological characteristics of seafloor habitats. Many experimental studies have documented acute, gear-specific effects of trawling and dredging on various types of habitat. These studies indicate that low mobility, long-lived species are more vulnerable to towed fishing gear than short-lived species in areas where the seabed is often disturbed by natural phenomena. Trawling and dredging may also change the composition and productivity of fish communities dependent on seafloor habitats for food and refuge. The scale of these impacts depends on the level of fishing effort. This volume presents color maps of fishing effort for all regions with significant bottom trawl or dredge fisheries-the first time that such data has been assembled and analyzed for the entire nation.
Author: R. N. Bray
Publisher: CIRIA
ISBN: 0860176843
Category : Dredges
Languages : en
Pages : 16
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Book Description
Author: Derek Jackson
Publisher: Elsevier
ISBN: 0081029276
Category : Science
Languages : en
Pages : 814
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Book Description
Sandy beaches represent some of the most dynamic environments on Earth and examining their morphodynamic behaviour over different temporal and spatial scales is challenging, relying on multidisciplinary approaches and techniques. Sandy Beach Morphodynamics brings together the latest research on beach systems and their morphodynamics and the ways in which they are studied in 29 chapters that review the full spectrum of beach morphodynamics. The chapters are written by leading experts in the field and provide introductory level understanding of physical processes and resulting landforms, along with more advanced discussions.
Author:
Publisher: Elsevier
ISBN: 0123785588
Category : Science
Languages : en
Pages : 629
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Book Description
Elements of Physical Oceanography is a derivative of the Encyclopedia of Ocean Sciences, Second Edition and serves as an important reference on current physical oceanography knowledge and expertise in one convenient and accessible source. Its selection of articles—all written by experts in their field—focuses on ocean physics, air-sea transfers, waves, mixing, ice, and the processes of transfer of properties such as heat, salinity, momentum and dissolved gases, within and into the ocean. Elements of Physical Oceanography serves as an ideal reference for topical research. References related articles in physical oceanography to facilitate further research Richly illustrated with figures and tables that aid in understanding key concepts Includes an introductory overview and then explores each topic in detail, making it useful to experts and graduate-level researchers Topical arrangement makes it the perfect desk reference
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 452
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Book Description
Author: Institution of Civil Engineers (Great Britain)
Publisher: Thomas Telford
ISBN: 9780727716545
Category : Technology & Engineering
Languages : en
Pages : 210
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Book Description
The dredging of a completely new site, requires careful investigation of site conditions. This book draws on the experience of a variety of expert authors to explain how to avoid operational problems, high maintenance costs and how to minimise the environmental impact.
Author:
Publisher:
ISBN:
Category : Coastal engineering
Languages : en
Pages : 242
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Book Description
Author: Programme des Nations Unies pour l'environnement. GRID-Geneva
Publisher:
ISBN: 9789280737516
Category : Natural resources
Languages : en
Pages : 35
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Book Description
Sand and gravels are the unrecognised foundational material of our economies. They are mined the world over, with aggregates accounting for the largest volume of solid material extracted globally (Peduzzi, 2014; Beiser, 2018). At the same time, these materials cannot be produced from our terrestrial, riverine and marine environments in quantities needed to meet demand from a world of 10 billion people without effective policy, planning, regulation and management. Such actions remain largely unaddressed by decision makers in public or private sectors. It is time to challenge the paradigm of infinite sand resources through constructive dialogue and solution-finding. This report aims to be the starting point from which a productive global conversation on sand extraction can begin. This synthesis was produced following a United Nations Environment Programme expert roundtable event held on 11 October 2018 in Geneva, Switzerland. The discussions emphasised potential solutions for mitigating mineral sands and aggregates extraction impacts and generating adequate support for responsible consumption pathways. Expert views were collated and complemented with additional research and consultation to distil key messages on an agenda for tackling this issue in 2019 and beyond.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309077958
Category : Science
Languages : en
Pages : 352
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Book Description
