Effects of Depth on Dredging Frequency PDF Download
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Author: Michael J. Trawle
Publisher:
ISBN:
Category : Channels (Hydraulic engineering).
Languages : en
Pages : 48
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Book Description
Author: Michael J. Trawle
Publisher:
ISBN:
Category : Channels (Hydraulic engineering).
Languages : en
Pages : 48
Get Book Here
Book Description
Author: Michael J. Trawle
Publisher:
ISBN:
Category : Channels (Hydraulic engineering).
Languages : en
Pages : 144
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Book Description
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 460
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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: National Research Council
Publisher: National Academies Press
ISBN: 0309077958
Category : Science
Languages : en
Pages : 352
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Book Description
Author: Michael J. Trawle
Publisher:
ISBN:
Category : Channels (Hydraulic engineering).
Languages : en
Pages : 46
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Book Description
Author:
Publisher:
ISBN:
Category : Coast changes
Languages : en
Pages : 640
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Book Description
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 972
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Book Description
Author:
Publisher: PIANC
ISBN: 2872231773
Category : Coral reef management
Languages : en
Pages : 94
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Book Description
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309036283
Category : Science
Languages : en
Pages : 223
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Book Description
Are the nation's ports adequate for our present and future needs? This volume points out that no significant new deep-water construction has occurred for a decade, and provides the information and analysis needed to goad the ports and the federal government into action. The book asks three questions: Is additional port construction and maintenance dredging needed now or over the next 20 years? What would prevent dredging if it is needed? What alternatives could make additional dredging possible? The book identifies several problems in dredging ports, including the long interval between a decision to deepen a port and the time the alterations are complete. The United States needs to speed port construction to meet changing needs, and the committee recommends that we prepare for future needs by dredging now.
