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Papers on Coastal Protection

COASTAL ENGINEERING 2004

Many papers are produced at this conference, mainly by coastal consultants themselves. Two of these produced at the 2004 Coastal Engineering Conference are of interest inasmuch as they discuss other factors in recognising coastal erosion due to offshore aggregate dredging extraction. Below are abstracts. The full PDF reports are available on the links provided at the end of each text.

Proceedings of the 29th International Conference National Civil Engineering Laboratory, Lisbon, Portugal, 19 - 24 September 2004

LINEAR EVOLUTION OF SAND WAVE PACKETS AND RELEVANCE TO OFFSHORE SAND EXTRACTION

DOI No:doi:10.1142/9789812701916_0200
Source:COASTAL ENGINEERING 2004
Copyright:World Scientific Publishing Co. Pte. Ltd.
Author(s):PIETER C. ROOS
Water Engineering and Management, Faculty of Engineering Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
PAOLO BLONDEAUX
Dipartimento di Ingegneria Ambientale, Università di Genova, Via Montallegro, 1, 16145 Genova, Italy
SUZANNE J. M. H. HULSCHER
Water Engineering and Management, Faculty of Engineering Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
GIOVANNA VITTORI
Dipartimento di Ingegneria Ambientale, Università di Genova, Via Montallegro, 1, 16145 Genova, Italy

Abstract:

Sand waves form a highly dynamic rhythmic bed feature in coastal seas like the North Sea. Various types of human intervention at the seabed, like large-scale offshore sand extraction, may interfere with sand waves. We investigate how a local topographic disturbance of a flat seabed may become morphodynamically active, according to the linear instability mechanism associated with sand wave formation. To that end, we present an analytical approach, using the essentials from existing models of sand wave formation. The results show how a linear sand wave packet evolves, gradually expanding and - in the case of tidal asymmetry or residual currents - migrating in time. Finally, we discuss the implications of our results for the long-term morphodynamic effects of sand extraction.

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ECONOMIC IMPACTS OF ANTHROPOGENIC ACTIVITIES ON COASTLINES OF THE UNITED STATES

DOI No:doi:10.1142/9789812701916_0244
Source:COASTAL ENGINEERING 2004
Copyright:World Scientific Publishing Co. Pte. Ltd.
Author(s):ORVILLE T. MAGOON
Coastal Zone Foundation, San Francisco, CA, USA
S. JEFFRESS WILLIAMS
U. S. Geological Survey, Woods Hole, MA, USA
LINDA K. LENT, Consulting Economist
Chysalis Consulting LLC, Bethesda, MD, USA
JAMES A. RICHMOND, Consulting Geologist
Pacifica, CA, USA
DONALD D. TREADWELL, Consulting Engineer
Sausalito, CA, USA
SCOTT L. DOUGLASS
University of South Alabama, Mobile, AL, USA
BILLY L. EDGE
Texas A&M University, College Station, TX, USA
LESLEY C. EWING
California Coastal Commission, San Francisco, CA, USA
ANTHONY P. PRATT
Delaware Department of Natural Resources and Environmental Control Dover, DE, USA

Abstract:

Anthropogenic activities primarily impact coasts by reducing sediment inputs, altering sediment transport processes, and accelerating sediment losses to the offshore. These activities include: sand and gravel extraction, navigation and shore protection works; non-structural shoreline management strategies such as beach nourishment, sand by-passing and beach scraping, dams and flood control works; channel and inlet dredging; subsidence caused by fluid extraction and reduction of carbonate beach material. Although many of these activities have improved the quality of life, they also have had unintended effects on the coast. The issues that arise from human alterations of the coast are common to many coastal regions around the world; this paper draws from several areas of the United States to present an overview and provisional assessment of the economic consequences of anthropogenic activities along the Pacific coast.

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