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BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to the field of apparatus used to modify the impact of waves as they wash ashore and diminish the impact of the waves in eroding beaches and other shoreline property. Diminishing beaches due to wave action and/or current erosion and lack of sediment replenishment from rivers are the primary cause of the threat to shoreline structures from storm tides, currents and wave action. 
     2. Description of the Prior Art 
     Historically, artificial reefs have been used to some degree of success in mitigating wave and tidal damage to shoreline structures. However, artificial reefs are typically extremely expensive to build and have short life spans. 
     Artificial reefs typically encourage ocean waves to expend their energy by breaking offshore, thereby reducing the impact of wave energy on the shoreline. Artificial reefs can be used to encourage sediment accretion in specific areas although present art is inexact for this purpose. 
     Present art used in the design and construction of artificial reefs almost universally incorporate monolithic design features. These include geo-textile sand bags, sunken boats or ships, rip rap or dredged materials. 
     Existing Art: 
     Weight, Buoyancy, Permeability and Flexibility: 
     Weight: 
     Present art depends on mass to keep an artificial reef in place. Massive weight requires unnecessary effort and cost in the form of material expense and handling costs. Massive weight also becomes a liability on sand or mud bottoms. The nature of sand and mud bottoms can best be described as solid fluids. Any device or object placed on the sea floor which has greater density than the “fluidized solid” bottom will eventually sink. This is one of the most common failures in artificial reefs using present art. Conversely, any device or object which has a density less than the “fluidized solid” bottom will “float” indefinitely. 
     Surface Area: 
     Monolithic structures by nature have relatively small surface areas relative to weight. Relatively small surface area decreases the overall effect on wave formation, littoral current dissipation and energy absorption, all of which require large surface areas. 
     Monolithic, small area structures used in the present art have an inability to disperse or absorb energy acting on the structure in the form of waves and/or currents. Littoral currents (currents moving parallel to shore) represent the main force that moves sediment and produces scouring along objects on the sea floor. Monolithic structures are able to redirect a current&#39;s energy. The result of energy re-direction is a change in speed and direction of current movement along with the sediment it carries. This is contrary to the ideal result which is: current energy absorption and sediment accretion within the reef structure. 
     Permeability: 
     Present artificial reef art with its monolithic nature and relatively small surface areas are not permeable. They do not let currents carrying sediment pass through the structure. Monolithic structures tend to redirect and increase the speed of littoral currents which allow them greater sediment carrying capacity. This result is directly contrary to the desired effect which is to encourage sediment accretion in specific areas especially within the reef&#39;s structure. 
     Flexibility: 
     Present art using monolithic structures depending on mass and relatively small surface areas are designed to redirect energy rather than absorb it. These are typically rigid structures subject to concentrated loads or forces. Nature demonstrates that flexibility is a key quality for energy absorption and structure longevity in an ocean environment. Present art does not include this key quality. 
     One of the present inventors, Gary Ross, is the inventor of the “Artificial Surfing Reef” which was patented on May 4, 1993 and assigned U.S. Pat. No. 5,207,531. The purpose of that invention was to create surfing waves. The invention included stacked groups of elongated pipes. 
     There is a significant need for an improved structure which will serve to modify the impact of waves as they wash ashore and diminish the impact of the waves in eroding beaches and other shoreline property. 
     SUMMARY OF THE INVENTION 
     The present invention is a submerged apparatus which has a top surface that rests a few feet below the surface of the ocean and serves to impact waves as they come ashore to dissipate the wave energy and impact the direction of flow of the waves to diminish the impact of the waves as they come ashore. 
     The present invention is a cost effective, ecologically sound, shoreline erosion mitigation device in the form of an artificial reef. 
     This new artificial reef art demonstrates the ability to: 
     (1) reduce or eliminate wave energy impact on shorelines; 
     (2) reduce or eliminate sediment transport via littoral current; 
     (3) encourage sediment accretion in specific areas create; and 
     (4) protect shoreline structures from ocean erosion. 
     The preset invention new reef features: 
     (1) modular construction; 
     (2) buoyancy; 
     (3) flexibility; 
     (4) scalability; 
     (5) permeability; and 
     (6) portability. 
     Each of the above features will now be more particularly described. 
     (1) Modular Construction: 
     The new art&#39;s main element consists of lengths of high density polyethylene (HDPE) pipe. Polyethylene is an inexpensive, inert plastic with natural toughness and flexibility which will not corrode or deteriorate in an ocean environment. High density polyethylene pipe is commonly used for dredging and oil transmission lines. 
     In the present invention, HDPE pipes are arranged in approximately parallel rows and connected by a system using clamps and flexible links which leaves space between the pipes. By increasing or decreasing the number, length and/or diameter of the pipes and/or the number of clamps, the design of the reef can be adjusted to accommodate differing bathymetrics and conditions. This modular nature allows this reef design to be easily scaled and engineered to meet virtually any location&#39;s requirements. 
     The fact that HDPE pipe is manufactured around the world and the universal nature of the clamp design insure low cost through economy of scale and ease of manufacture. 
     (2) Buoyancy: 
     The ability to adjust the buoyancy of this new artificial reef is key to the benefits of this new art. The major element is HDPE pipe which floats with open ends. This allows material such as sand or aggregate to be added as ballast within the HDPE pipes to decrease buoyancy and vastly increase weight. With the ends of the pipes closed and pipes empty, buoyancy increases dramatically. 
     It is now possible to adjust the overall and/or specific pipe buoyancy by adding or withholding material within the pipes. This allows adjustment of buoyancy to insure reef structure stability and longevity. The buoyancy could be varied in several ways. At least one or more of the HDPE pipes can be filled entirely with air, at least one or more of the HDPE pipes can be filled entirely with ballast or sand, or at least one or more of the HDPE pipes can be partially filled with air and partially filled with ballast such as sand. 
     (3) Construction Procedure: 
     During the construction phase of this reef all pipes will be fitted with closed ends to create the maximum amount of buoyancy. Connecting clamps would be installed in calm water within a harbor. In this initial assembly phase, the assembled reef would look like a log/pipe raft with most or all pipe elements floating on the water&#39;s surface. The ability to “float” the pipes into position during the construction phase, in protected water, greatly reduces material handling costs. Assembly of the reef in a controlled environment such as a harbor also greatly reduces construction impacts on environmentally fragile shoreline locations. 
     Once assembly is complete, the reef “raft” is towed to location. 
     The instillation phase includes placing anchors or fastening points to the bottom, positioning the floating reef assembly through the use of tugs and temporary lines or cables, attachment to fastening points and buoyancy adjustment. 
     Fastening point locations and buoyancy adjustment will determine the final cross sectional and plan form of the reef. These operations will take into consideration the bottom structure, waves and currents and other natural environmental factors 
     Buoyancy variability simplifies construction, transport and placement of this new reef. Inexpensive assembly, materials, standardized fastening system and shape adjustability insure efficacy with remarkably low cost and quick, low impact construction. 
     (4) Flexibility: 
     The inherent flexibility of HDPE pipe and the flexibility built into the pipe connection system allow the individual elements and complete assembly to absorb/react to the forces exerted on it in the ocean environment. The flexibility and modularity of the connecting clamps allow the entire structure to share the forces acting upon it. This “load sharing” is a key quality of the new reef structure. Highly concentrated loads such as a wave breaking on the reef structure are dispersed throughout the structure by virtue of the bending of the HDPE pipe and the elongation and compression of the flexible linking elements. The nature of the design of the connecting clamps adds hoop strength to the HDPE pipes at the connection points. This reduces the tendency of a pipe to collapse or flatten under bending loads. Inclusion of connecting links of various shapes and/or lengths and/or compression struts between pipes and the natural HDPE pipe&#39;s flexibility allows manipulation of the pipe elements to non-linear or curved forms. This ability greatly increases design adaptability to location and conditions as well as overall strength. 
     (5) Scalability: 
     It is known that in order to encourage ocean waves to break, the size of an artificial reef is critical. In general the larger the reef, the more control over wave action any design will have. The ability to cost effectively add to the size and/or modify the shape of an artificial reef vastly increases its potential to control or modify ocean waves. The modular design of this reef makes it intrinsically scalable. Scalability increases efficacy and also intrinsically lowers cost during both the design and construction phases. 
     (6) Permeability: 
     Permeability is a fundamental element of this new art. The principal this new reef utilizes is similar to that of a snow or sand fence. The flow of wind carrying sand or snow is slowed down and redirected by a “permeable” fence to encourage accretion of snow or sand around the fence. Reef permeability and shape of the pipe elements in this new reef structure function in much the same way. 
     Permeability is achieved by fastening HDPE pipes together with a space between them. Permeability offers the advantage of increased surface area not directly exposed to ocean forces. This means any force acting on the structure is dispersed over a larger area equating to lower force per unit area. 
     The circular cross section of pipe tends to disperse or redirect forces from any given vector. Flow around a pipe slows down as it passes the pipe and changes direction to random vectors. Sediment carried in the decreasing flow precipitates or falls to the ocean bottom within the reef structure. 
     A primary function of this new art is to accrete sediment within its structure. Sediment accretion adds to the stability of the reef structure and its effectiveness to encourage ocean waves to break offshore. 
     In locations where sand is not available for accretion the reef&#39;s permeability and cylindrical pipe form elements are used primarily for energy absorption and distribution throughout the structure. Without permeability effective sand accretion and efficient load sharing would not be possible. 
     (7) Portability: 
     As described above, portability facilitates construction, transport and placement of the new reef. An additional benefit of this portable reef design is that it can be easily removed or relocated. The ability to increase buoyancy by removing sand ballast from within the pipes or simply adding air into specific pipes adjacent any pipes committed with permanent ballast, through the use of pumps, allows the entire structure to be re-floated and moved. A beach can be widened or “built” by simply moving the reef structure a short distance farther seaward as sediment accretes within the structure. 
     Portability also allows quick reef instillation to protect threatened structures during emergencies. 
     The design elements of this structure are not limited to ocean shoreline protection. The features and functions of this design can be used to mitigate erosion of river banks, levies, canals or any other body of water subject to shoreline erosion due to waves and/or current. 
     (8) Comments on Reef Plan Forms and Cross Section Shapes: 
     Any given location will have its own requirements for shore line erosion mitigation. The modular nature of this design allows virtually any size or shape of reef to be designed to create the desired effect. Suggested plan forms might be “Y’ shaped to encourage certain wave forms. Plan forms can be rectangular, triangular or crescent in shape. Non-linear or non-geometric shapes are also possible plan forms. Cross sectional shapes can be anything from flat to circular to more organic or non-liner, non-geometric. 
     The design of fastening point grids in the ocean floor can be arranged to impart both plan form and cross sectional shape. 
     Cables and/or struts fastened between reef structure elements can be used to control shape and functional qualities. 
     Further novel features and other objects of the present invention will become apparent from the following detailed description, discussion and the appended claims, taken in conjunction with the drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Referring particularly to the drawings for the purpose of illustration only and not limitation, there is illustrated: 
         FIG. 1  is a perspective view of a preferred embodiment of the present invention shoreline erosion mitigation device; 
         FIG. 2  is a close-up perspective view of a preferred embodiment of the present invention shoreline erosion mitigation device, showing the leading edge of the device in greater detail; 
         FIG. 3  is a top plan view of a preferred embodiment of the present invention shoreline erosion mitigation device; 
         FIG. 4  is a perspective view of the leading straight edge of a preferred embodiment of the present invention shoreline erosion mitigation device with a line representing sea level; 
         FIG. 5  is a close-up perspective view of an alternative embodiment of the present invention where the pipes are sealed; 
         FIG. 6  is a top perspective view of a section of a preferred embodiment of the present invention shoreline erosion mitigation device, the dark color reef structure is above the grade and the light color reef structure is below the grade where the clamps are made of flexible links and the pipe is shown as polyethylene pipe; 
         FIG. 7  is a perspective view of a fastening clamp used to connect two pipes together; 
         FIG. 8  is a top perspective view of a section of a preferred embodiment of the present invention shoreline erosion mitigation device after sand accretion has started on the structure; 
         FIG. 9  is a front perspective view of a section of a preferred embodiment of the present invention shoreline erosion mitigation device, where the polyethylene pipe is shown, stainless clamps with flexible links are disclosed and there are inlet and outlet ballast ports on both ends of the pipe; 
         FIG. 10  is a perspective view of a first alternative embodiment of the present invention shoreline erosion mitigation device; 
         FIG. 11  is a perspective view of a second alternative embodiment of the present invention shoreline erosion mitigation device; 
         FIG. 12  is a perspective view of a third alternative embodiment of the present invention shoreline erosion mitigation device; and 
         FIG. 13  is a perspective view of a fourth alternative embodiment of the present invention shoreline erosion mitigation device. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Although specific embodiments of the present invention will now be described with reference to the drawings, it should be understood that such embodiments are by way of example only and merely illustrative of but a small number of the many possible specific embodiments which can represent applications of the principles of the present invention. Various changes and modifications obvious to one skilled in the art to which the present invention pertains are deemed to be within the spirit, scope and contemplation of the present invention as further defined in the appended claims. 
     Referring to  FIGS. 1 through 4 , there is illustrated a preferred embodiment of the present invention shoreline erosion mitigation device  10 . The main element of the device  10  consists of lengths of high density polyethylene (HDPE) pipe  20 . PE is an inexpensive, inert plastic with natural toughness and flexibility which will not corrode or deteriorate in an ocean environment. Polyethylene pipe is commonly used for dredging and oil transmission lines. 
     In the present invention  10 , HDPE pipes  20  are arranged in approximately parallel rows  30  and connected by a system using flexible links or clamps  200  (see  FIG. 7 ) which leaves space  120  between the pipes  20 . By increasing or decreasing the number, length and/or diameter of the pipes  20  and/or the number of clamps  200 , the design of the reef  10  can be adjusted to accommodate differing bathymetrics and conditions. This modular nature allows this reef design to be easily scaled and engineered to meet virtually any location&#39;s requirements. 
     The fact that HDPE pipe is manufactured around the world and the universal nature of the clamp design insure low cost through economy of scale and ease of manufacture. 
     Each pipe  20  has a diameter “D 1 ” which can range from 12 inches to 26 inches. The preferred shape of each leg of the device  10  is arcuate, having a diameter D 2  which can be 50 feet and a vertical height “H 1 ” which can be 25 feet. In the preferred embodiment, the device or reef  10  has a leading leg section  40  which extends to a first divergent leg section  50  and a second divergent leg section  60 . The sections are fastened to anchors  70  which are buried in the ocean sand. The lower edges  40 A and  40 B of leading leg section  40 , and  50 A and  50 B of first divergent leg section  50  and  60 A and  60 B of second divergent leg section  60  are resting on the ocean floor and the top surface  40 C,  50 C and  60 C of each section rest a few inches or a few feet below the water surface, depending on the slope of the beach. 
     In a preferred orientation, the front or leading edge  40 D of leading leg section  40  is positioned so that it faces toward the open sea and away from the beach while the trailing edges  50 D and  60 D of the two divergent leg sections  50  and  60  are closest to the shoreline. 
     The ability to adjust the buoyancy of this new artificial reef  10  is key to the benefits of this new art. The major element is HDPE pipe  20  which floats with open ends. This allows material such as sand or aggregate to be added as ballast within the interior  22  of the HDPE pipes  20  to decrease buoyancy and vastly increase weight. With the ends of the pipes closed (as illustrated in  FIG. 5 ) and pipes empty, buoyancy increases dramatically. 
     It is now possible to adjust the overall and/or specific pipe buoyancy by adding or withholding material within the pipes  20 . This allows adjustment of buoyancy to insure reef structure stability and longevity. 
     During the construction phase of this reef all pipes will be fitted with closed ends as illustrated in  FIG. 5  to create the maximum amount of buoyancy. Referring to  FIG. 7 , connecting clamps  200  comprise an upper section  210  and a lower section  220  which are connected by nut and bolt fasteners  250 A  250 B and  250 C extending through openings in respective first upper exterior lip  212  to first lower exterior lip  222  and an opposite set of nut and bolt fasteners  252 A,  252 B and  252 C extending through openings in respective second upper exterior lip  232  to second lower exterior lip  242 . Sandwiched between the lips is a connecting plate  260  with openings  262 A,  262 B and  262 C adjacent one end to receive a set of nut and bolt fasteners and openings  264   a ,  264   b  and  264   c  (see  FIG. 5 ) adjacent an opposite end to receive a second set of nut and bolt fasteners. A clamp  200  is wrapped around a pipe  20  so that its upper section  210  and lower section  220  enclosed a portion of the surface of a pipe  20  and are fastened around the pipe  20  by fastening members  250 A,  250 B,  250 C,  252 A,  252 B and  252 C. An adjacent clamp is fastened around an adjacent pipe and similarly fastened. The connecting plate has a length L 3  so that a given space is formed between two adjacent connecting pipes which space is approximately the distance L 3  from oppositely disposed openings. A multiplicity of such clamps is fastened around spaced apart locations along the length of the pipes  20  of each section  40 ,  50  and  60  with adjacent section of pipe separated by the distance L 3  of the connecting plate  260 . Connecting clamps  200  would be installed in calm water within a harbor. In this initial assembly phase, the assembled reef  10  would look like a log/pipe raft with most or all pipe elements floating on the water&#39;s surface. The ability to “float” the pipes into position during the construction phase, in protected water, greatly reduces material handling costs. Assembly of the reef in a controlled environment such as a harbor also greatly reduces construction impacts on environmentally fragile shoreline locations. 
     Once assembly is complete, the reef “raft” is towed to location. 
     The installation includes placing anchors  70  fastening points to the bottom. 
     The inherent flexibility of HDPE  20  pipe and the flexibility built into the pipe connection system allow the individual elements and complete assembly to absorb/react to the forces exerted on it in the ocean environment. The flexibility and modularity of the connecting clamps  250  allow the entire structure to share the forces acting upon it. This “load sharing” is a key quality of the new reef structure. Highly concentrated loads such as a wave breaking on the reef structure are dispersed throughout the structure by virtue of the bending of the HDPE pipe  20  and the elongation and compression of the flexible linking elements  260 . The nature of the design of the connecting clamps  200  adds hoop strength to the HDPE pipes  20  at the connection points. This reduces the tendency of a pipe to collapse or flatten under bending loads. Inclusion of connecting links  260  of various shapes and/or lengths and/or compression struts between pipes and the natural HDPE pipe&#39;s flexibility allows manipulation of the pipe elements to non-linear or curved forms. This ability greatly increases design adaptability to location and conditions as well as overall strength. 
     It is known that in order to encourage ocean waves to break, the size of an artificial reef  10  is critical. In general, the larger the reef, the more control over wave action any design will have. In addition, the larger the reef, the more likely that waves having more or larger wavelengths will be affected by the reef. The ability to cost effectively add to the size and/or modify the shape of an artificial reef vastly increases its potential to control or modify ocean waves. The modular design of this reef makes it intrinsically scalable. Scalability increases efficacy and also intrinsically lowers cost during both the design and construction phases. Referring to  FIG. 3 , by way of example, the entire length L 6  of the reef  10  can be approximately 251 feet, the length L 7  of the first section  40  can be approximately 196 feet, the length L 8  of the divergent sections  50  and  60  can be approximately 154 feet. The width “W 6 ” of the leading edge of first section  40  can be approximately 51 feet and the width “W 7 ” of the extreme ends of the divergent sections  50  and  60  can be approximately 194.5 feet. It will be appreciated that these are just illustrative dimensions examples and the reef  10  can be any desired dimension. 
     Permeability is a fundamental element of this new art. The principal this new reef utilizes is similar to that of a snow or sand fence. The flow of wind carrying sand or snow is slowed down and redirected by a “permeable” fence to encourage accretion of snow or sand around the fence. Reef permeability and shape of the pipe elements in this new reef structure function in much the same way. 
     Permeability is achieved by fastening HDPE pipes together with a space L 3  between them. Permeability offers the advantage of increased surface area not directly exposed to ocean forces. This means any force acting on the structure is dispersed over a larger area equating to lower force per unit area. 
     The circular cross section of pipe  20  tends to disperse or re-direct forces from any given vector. Flow around a pipe slows down as it passes the pipe and changes direction to random vectors. Sediment carried in the decreasing flow precipitates or falls to the ocean bottom within the reef structure. 
     A primary function of this new art is to accrete sediment within its structure. Sediment accretion adds to the stability of the reef structure and its effectiveness to encourage ocean waves to break offshore. 
     In locations where sand is not available for accretion, the reef&#39;s permeability and cylindrical pipe form elements are used primarily for energy absorption and distribution throughout the structure. Without permeability effective sand accretion and efficient load sharing would not be possible. 
     The pipes  20  have a hollow interior  22  into which water or heavier objects such as sand can be placed. Each end of a pipe can be sealed with a cap or ballast port  24   
     As described above, portability facilitates construction, transport and placement of the new reef. An additional benefit of this portable reef design is that it can be easily removed or relocated. The ability to increase buoyancy by removing sand ballast from within the pipes through the use of pumps, allows the entire structure to be re-floated and moved. A beach can be widened or “built” by simply moving the reef structure a short distance farther seaward as sediment accretes within the structure. 
     Portability also allows quick reef instillation to protect threatened structures during emergencies. 
     The design elements of this structure are not limited to ocean shoreline protection. The features and functions of this design can be used to mitigate erosion of river banks, levies, canals or any other body of water subject to shoreline erosion due to waves and/or current. 
     Any given location will have its own requirements for shoreline erosion mitigation. The modular nature of this design allows virtually any size or shape of reef to be designed to create the desired effect. Suggested plan forms might be “Y’ shaped as illustrated in  FIGS. 1 and 3  to encourage certain wave forms. Plan forms can be rectangular, triangular or crescent in shape. Non-linear or non-geometric shapes are also possible plan forms. Cross-sectional shapes can be anything from flat to circular to more organic or non-linear, non-geometric. A shape such as a manta ray or bat as illustrated in  FIGS. 10 ,  11  and  12  or sinusoidal as illustrated in  FIG. 13  are also within the spirit and scope of the present invention. 
     The design of fastening point grids in the ocean floor can be arranged to impart both plan form and cross sectional shape. 
     Cables and/or struts fastened between reef structure elements can be used to control shape and functional qualities. 
     As a wave comes towards a shoreline, the wave hits the front or leading edge  40 D of leading leg section  40  and the force of the wave is distributed over the top surfaces  40 C,  50 C and  60 D of the reef sections  40 ,  50  and  60  and partially fall through the gaps between the pipes  20  and are caused to be redirected in the direction of the divergent leg sections  50  and  60  to thereby substantially reduce the force of the wave as it comes ashore, thereby substantially reduce beachfront or waterfront erosion. 
     During the construction phase of this reef, all pipes will be fitted with closed ends to create the maximum amount of buoyancy. Connecting clamps would be installed in calm water within a harbor. In this initial assembly phase, the assembled reef would look like a log/pipe raft with most or all pipe elements floating on the water&#39;s surface. The ability to “float” the pipes into position during the construction phase, in protected water, greatly reduces material handling costs. Assembly of the reef in a controlled environment such as a harbor also greatly reduces construction impacts on environmentally fragile shoreline locations. 
     Once assembly is complete, the reef “raft” is towed to location. 
     The instillation phase includes placing anchors or fastening points to the bottom, positioning the floating reef assembly through the use of tugs and temporary lines or cables, attachment to fastening points and buoyancy adjustment. 
     Fastening point locations and buoyancy adjustment will determine the final cross sectional and plan form of the reef. These operations will take into consideration the bottom structure, waves and currents and other natural environmental factors 
     Buoyancy variability simplifies construction, transport and placement of this new reef. Inexpensive assembly, materials, standardized fastening system and shape adjustability insure efficacy with remarkably low cost and quick, low impact construction. 
     Of course the present invention is not intended to be restricted to any particular form or arrangement, or any specific embodiment, or any specific use, disclosed herein, since the same may be modified in various particulars or relations without departing from the spirit or scope of the claimed invention hereinabove shown and described of which the apparatus or method shown is intended only for illustration and disclosure of an operative embodiment and not to show all of the various forms or modifications in which this invention might be embodied or operated.

Summary:
A shoreline erosion mitigation device placed in a body of water including a multiplicity of high density polyethylene pipes each of a given length and diameter with each pipe being generally cylindrical in shape and having a hollow interior, the multiplicity of high density polyethylene pipes arranged in approximately parallel rows with adjacent pipes connected together by a system using clamps and flexible links, which leaves a space between adjacent pipes so that by increasing or decreasing the number, length and/or diameter of the pipes and/or the number of clamps, the design of the device is adjusted to accommodate differing shoreline conditions. When a wave having a given force traveling from the body of water towards the shoreline encounters the device, the force of the wave is reduced by causing the water to travel over the device and through the spaces between adjacent pipes before reaching the shoreline.