scholarly journals APPLICATION OF FLUORESCENT COATED SAND IN LITTORAL DRIFT AND INLET STUDIES

1968 ◽  
Vol 1 (11) ◽  
pp. 19 ◽  
Author(s):  
Minze Stuiver ◽  
J.A. Purpura
Keyword(s):  
Coastal Engineering ◽  
Beach Erosion ◽  
Tracer Study ◽  
Littoral Drift ◽  
Sand Movement ◽  
Protective Structures ◽  
Coated Sand

The use of fluorescent coated sand In tracing the sand movement along beaches and around Inlets is an important tool in the field of Coastal Engineering. As a part of an extensive beach erosion study along the shore of West Palm Beach, Florida, four areas were subjected to such a "tracer study." Each area represented a particular beach configuration either with or without erosion protective structures. In this paper the procedure and results for one area is described. As a second application of sand tracers, the results of a study concerned with the sand migration in and around South Lake Worth Inlet is discussed.

scholarly journals ACCURACY OF HYDROGRAPHIC SURVEYING IN AND NEAR THE SURF ZONE

2000 ◽  
Vol 1 (3) ◽  
pp. 3
Author(s):  
Thorndike Saville, Jr. ◽  
Joseph M. Caldwell
Keyword(s):  
Surf Zone ◽  
Average Rate ◽  
Significant Degree ◽  
Beach Erosion ◽  
Littoral Drift ◽  
Depth Measurement ◽  
Average Change ◽  
Sand Movement ◽  
Quantitative Changes ◽  
Dominant Direction

The analysis and solution of most beach erosion problems are based to a significant degree on the quantitative changes in the bottom hydrography as observed in successive surveys. Critical decisions as to the dominant direction of littoral drift, the average rate of this drift, and the onshore-offshore movement of material are based largely on such hydrographic surveys. As the net changes between successive surveys are usually small compared to the area being studied, the degree of accuracy or comparability of the hydrographic surveys is of considerable importance. For instance, a net change of 100,000 cubic yards over one square mile of beach represents an average change in depth of only about 0.1 feet. Thus, it can be seen that uncompensated errors in depth measurement of as little as 0.1 feet can produce indications of significant littoral sand movement which might not exist in reality.

scholarly journals THE GEOLOGICAL ASPECTS OF COASTAL ENGINEERING

2010 ◽  
Vol 1 (1) ◽  
pp. 13
Author(s):  
John W. Handin
Keyword(s):  
Erosion Rate ◽  
Coastal Engineering ◽  
Beach Erosion ◽  
Supply Rate ◽  
Secular Equilibrium ◽  
Equilibrium Conditions ◽  
Beach Sediment ◽  
Stable Position ◽  
Shore Line ◽  
Sand Supply

A natural beach system is in equilibrium when there is a balance between sand supply and erosion such that the volumes of material entering and leaving the system are just equal. If the erosion rate exceeds the supply rate, a beach retrogrades; if the erosion rate is less than the supply rate, a beach progrades. Unfortunately, coastal engineering works, which are meant to improve the shore for commerce or recreation, often upset this delicate balance with very deleterious results: great accretions of sand and high dredging costs, accelerated beach erosion and much property damage. It is the task of the geologist to determine the secular equilibrium conditions of a beach system and to supply the coastal engineer with the information he needs to control the natural forces acting on the shore in such a way that this equilibrium is maintained. In order to accomplish this task, the geologist needs to make a thorough study of the source, transportation, and deposition of beach sediment. He must determine the stable position of the shore line and the profile of equilibrium of the beaches through detailed physiographic investigations. The geological report can and should close with the prediction of just what will happen to a natural beach system if man introduces a disturbing element.

scholarly journals BEACH CHANGE AROUND DETACHED BREAKWATERS DUE TO ARTIFICIAL NOURISHMENT OF BYPASSED SAND

1986 ◽  
Vol 1 (20) ◽  
pp. 115 ◽  
Author(s):  
H. Suyama ◽  
T. Uda ◽  
T. Yoshimura
Keyword(s):  
Field Experiment ◽  
Bottom Topography ◽  
Tracer Tests ◽  
Littoral Drift ◽  
Spatial Changes ◽  
Toyama Bay ◽  
Concrete Blocks ◽  
Sand Movement ◽  
Temporal And Spatial ◽  
Artificial Nourishment

Field experiment of sand bypassing was conducted on the Shimoni—ikawa Coast in Toyama Bay. The materials of 5900 m3 dredged on the updrift coast of the harbor were thrown into behind the detached breakwater. After the nourishment detailed surveys of the bottom topography around the breakwaters, wave observations and tracer tests using colored concrete blocks were carried out in order to investigate the movement of the nourished sand. Temporal and spatial changes of the shoreline positions and the sectional area of the beach in the shoreward zone of the detached breakwater are examined. It is found through the field experiment that the materials nourished behind the detached breakwater were carried slowly in the longshore direction by the westward littoral drift, dominating on the coast, without the outflow of sand through the openings of the breakwaters. It is concluded that the detached breakwater is useful to control the on—offshore sand movement and to retain the sand behind the detached breakwater.

scholarly journals EROSION ALONG THE ILLINOIS SHORE OF LAKE MICHIGAN

2000 ◽  
Vol 1 (2) ◽  
pp. 14
Author(s):  
Thomas B. Casey
Keyword(s):  
Great Lakes ◽  
Fresh Water ◽  
Lake Michigan ◽  
State Level ◽  
Coastal Engineering ◽  
The State ◽  
Beach Erosion ◽  
Focus Attention ◽  
Shore Line ◽  
The Many

In the consideration of problems of coastal engineering in general, and of shore and beach erosion in particular, one is quite naturally apt to immediately focus attention upon our ocean shores to the exclusion of inland areas. Many are perhaps not appreciative of the fact that the five inland fresh-water lakes comprising the Great Lakes system are bordered by eight states having a combined length of shore line of approximately 3,000 miles. (See Fig. 1) Only in recent years has there been a general awakening of interest in the many and varied problems of erosion which occur along these inland coasts. The purpose of this paper is to summarize the problems existing on the Illinois shore and to outline the steps which have been taken at the State level in seeking a solution to those problems.

scholarly journals THE BEACH EROSION BOARD

2010 ◽  
Vol 1 (1) ◽  
pp. 12
Author(s):  
Dabney O. Elliott
Keyword(s):  
United States ◽  
Federal Government ◽  
The United States ◽  
Coastal Engineering ◽  
The State ◽  
Beach Erosion ◽  
Corps Of Engineers ◽  
Navigation Channel ◽  
Indian River ◽  
Local Agencies

The purpose of this paper is to describe the methods by which, and the extent to which the Federal Government participates with local agencies in the control of beach erosion. The Beach Erosion Board of the Corps of Engineers is the instrumentality through which this participation is affected. However, before describing this Board, it is necessary to sketch very briefly the background of the beach erosion problem as viewed from the national standpoint. The necessity for the control of beach erosion by one means or another has no doubt been recognized from the beginning of the practice of coastal engineering in the United States. The early technical records of the Corps of Engineers contain numerous references to the mutual effects which navigation structures and the adjacent shorelines exert upon each other. As an example, chosen at random, I may mention the construction in 1874 of twelve stone groins along the shore of the State of Connecticut between Welshs Point and Indian River, and of a stone jetty at the mouth of that river in the following year, to stabilize the shoreline and to prevent the movement of sand into the navigation channel of that river.

scholarly journals PHYSICAL MODELLING OF BEACH EROSION AND LITTORAL DRIFT

1988 ◽  
Vol 1 (21) ◽  
pp. 134 ◽  
Author(s):  
Otavio J. Sayao ◽  
Robert B. Nairn
Keyword(s):  
Grain Size ◽  
Physical Model ◽  
Scale Effects ◽  
Physical Modelling ◽  
Beach Erosion ◽  
Model Design ◽  
Littoral Drift ◽  
Sedimentary Processes ◽  
Dynamic Similarity ◽  
Proposed Model

A new procedure for physical modelling of beach sedimentary processes is presented. It is shown that the modelling requirements proposed by Dean (1985) are necessary but not sufficient for dynamic similarity. Quantification of scale effects due to slope and relative grain size scaling conditions enables extrapolation of the physical model results to prototype situations. Selected examples of the application of the proposed model design are also given.

scholarly journals 50-YEAR HISTORY OF THE UNITED STATES (USA) ARMY ENGINEERS COASTAL ENGINEERING RESEARCH BOARD (CERB)

2018 ◽  
pp. 70
Author(s):  
Joan Pope
Keyword(s):  
United States ◽  
The United States ◽  
Public Law ◽  
Coastal Engineering ◽  
Beach Erosion ◽  
Research And Practice ◽  
Engineering Research ◽  
History Of ◽  
Hydraulics Laboratory ◽  
Coastal Research

The U. S. Army Coastal Engineering Research Board (CERB), established on 7 November 1963 by Public Law No. 172, of the 88th USA Congress, has had a major impact on the field and profession of coastal engineering for over 50 years. The CERB replaced the Beach Erosion Board (BEB) (created in 1930) and provided oversight to the Coastal Engineering Research Center (CERC), now the Coastal and Hydraulics Laboratory. The greatest names in USA coastal engineering and science have served on the CERB and helped to define the course of USA coastal research and practice.

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