Seawall Construction Research Articles

Evolution of seawall construction methods in Boston Harbor, Massachusetts : P. S. Rosen & D. B. Vine, Proceedings — ICE: Structures & Buildings, 110(3), 1995, pp 239–249

Evolution of seawall construction methods in Boston Harbor, Massachusetts : P. S. Rosen & D. B. Vine, Proceedings — ICE: Structures & Buildings, 110(3), 1995, pp 239–249

EVOLUTION OF SEAWALL CONSTRUCTION METHODS IN BOSTON HARBOR, MASSACHUSETTS.

Seawall construction methods in Boston, Massachusetts, USA, evolved as materials such as cut stone, concrete and steel became available, as the understanding of geotechnical principles grew, and as the growth of trade required more substantial coastal structures. As a significant number of 19th century stone seawalls are still in use in the Boston region, techniques for evaluating and repairing surviving historic structures, as opposed to replacing them, are important during the ongoing revitalization of the harbour.

The Kansai International Airport project and environmental impact assessment

Kansai International Airport is under construction in Osaka Bay, 5 km off the coast of Senshu. The construction of seawalls in the airport island commenced in January, 1987. With the opening of the airport scheduled for the spring of 1993, the construction of aboveground facilities will soon begin. Construction of this airport, designed as a key international airport in Japan, is being carried out as a national project. In Osaka Bay, land reclamation is strictly controlled by provisions in the Special Law for Environmental Conservation in the Seto Inland Sea. Accordingly, special emphasis has been placed on preventing environmental pollution in and around Osaka Bay, and conserving the natural environment in preparing the airport plan, as well as in assessing environmental impact prior to construction. This paper outlines the environmental impact assessment regarding construction of Kansai International Airport and environmental monitoring during construction, focusing on the impact on water quality.

The effects of seawalls on the beach: an extended literature review

A previous review by the author of the literature on the effects of seawalls on the beach is extended to include recent work and more thorough coverage of past studies. The present review covers approximately 100 technical papers on laboratory, field, and theoretical and conceptual studies published through mid-1988 and has three objectives: (1) to collect results of well-documented studies, (2) to summarize the state of knowledge on the seawall and beach interaction, and (3) to make recommendations for further study and field monitoring programs. It is concluded that beach change near seawalls, both in magnitude and variation, is similar to that on beaches without seawalls, if a sediment supply exists. Sediment volumes eroded by storms at beaches with and without seawalls are comparable, as are post-storm recovery rates. In addition, the shape of the beach profile after construction of a seawall is similar to the preconstruction shape if a sediment supply exists, showing the same number of bars with approximately the same volumes and relative locations. The form of the erosional response to storms at seawalls is typically different, however, with foreshore erosion that occurs on beaches without seawalls manifested as more localized toe scour and end effects of flanking and impoundment at seawalls. Limited evidence indicates that the subaqueous nearshore profile on a sediment-deficient coast with seawalls does not steepen indefinitely, but approaches an equilibrium configuration compatible with the coarser-grained particles comprising the bottom sediment.

BEACHWALLS FOR BEACH EROSION PROTECTION

Many shoreline property owner protect the beaches from erosion walls. In many situations, these sea increase in beach erosion forcing, adjoining properties to construct their shoreline. The construction o causes erosion on the adjacent prop more often than not, where beach construction of sea walls in addi erosion to adjacent property has cause of the beaches. s, in an effort to have constructed sea walls have caused an by "domino effect", sea walls to protect f a sea wall often erty. Unfortunately, s once existed, the tion to causing beach ed the disappearance Because of the concern for the eroding beaches and the proliferation of sea walls, the design of a "beachwall" was proposed over four years ago by the author. Several of these beachwalls have been constructed, and the beaches fronting these structures have thus far been preserved or restored.

Relations entre le niveau marin, les dépôts sédimentaires et la construction des digues dans la plaine maritime picarde

Comparaison of soils profiles gives a general view of the sedimentation in the Picardy Coastal Plain. The construction of sea-walls can be connected with the sea-level variations and with the population history (peace, wars, increase in population).

Land-building and Stabilization by Mangroves

Covering broad areas of tropical shorelines are unique plants known as mangroves, which exhibit several structural and physiological modifications to the saline environment—especially in their root systems. Prop-roots and pneumatophores, two obvious modifications, allow mangroves to play a role in coastal geomorphology, either as land-builders or as stabilizers of substrates derived from classical sedimentation processes.Current data show that: (1) Provided with proper substrates, mangrove seedlings can be raised in the laboratory for later planting in the field, although on exposed beaches success ratios may be low. (2) Larger mangrove plants (1.0–5.0 m in height) may be transplanted with relative ease and appear to succeed with few or no mortalities resulting from the techniques used. (3) Pruning of mangroves appears to be a successful method of mangrove control, allowing their utilization for stabilization around housing developments. (4) Fossil evidence for mangroves as shoreline developers is suggested by the discovery of a fossil mangrove reef off the Miami, Florida, coast. However, submergence of near-by mangrove areas has occurred, as evidenced by sea-grass beds growing above buried peat in the bay bottom. (5) Black Mangroves may be more useful than Red Mangroves as shoreline stabilizers due to their cold-hardiness, ability to tolerate disturbed substrates, and rapid production of pneumatophores. (6) Insect and isopod damage to mangroves has been documented, and it has been suggested by several research workers that such damage may lead to increased erosion of coastlines in many areas of southern and central Florida. In addition, boring activities in Red Mangrove seedlings may result in decreased numbers of seedlings being available for new mangrove growth and colonization. (7) Mangroves have been suggested for use as stabilizers of substrates in conjunction with planned filling and sea wall construction.

Recent developments in sea wall construction and land reclamation.

Recent developments in sea wall construction and land reclamation.

BREAKWATER CONSTRUCTION

Upon receipt of an invitation to participate in this conference and present a paper on the subject of Breakwater Construction, I was happy to accept, feeling that I would benefit to a far greater degree than my contribution to a subject in which I, and the concern which I represent, have had a deep interest for many years. Our experience embraces some of the major jetty and sea wall construction in San Francisco Bay, viz: Treasure Island, Mare Island, Alameda Naval Air Station, Sacramento and San Joaquin River bank protection and other jetties along the Northern California Coast, including Crescent City. This paper is limited to breakwater construction on the basis of our experience previously mentioned. The subject has been divided into two parts, namely, (1) construction of jetties, or breakwaters which can be built by use of floating equipment and (2) construction of jetties which are not practicable to be built by use of floating equipment.

The Engineering Aspects of Sea-Wall Construction and Operation

The Engineering Aspects of Sea-Wall Construction and Operation