Methods, systems, and computer-readable media that implement an autonomous modular breakwater system. An example system includes a plurality of autonomous submersible structures, each configured to mechanically link to any other of the plurality of autonomous submersible structures to form a breakwater. The system includes a controller configured to perform operations including: determining a location for construction of a breakwater; determining an initial location of each of the plurality of autonomous submersible structures; selecting, based at least in part on the initial location of each of the plurality of autonomous submersible structures, a subset of the plurality of autonomous submersible structures for constructing the breakwater; and transmitting, to each of the selected autonomous submersible structures, instructions to transit from the respective initial location to the location for construction of the breakwater and to mechanically couple to at least one other autonomous submersible structure to form the breakwater.

A flat catamaran watercraft construction is provided having a bow that defines a “split V” configuration in which the bottom surface of each of the two asymmetrical catamaran hull portions at the forward section of each hull portion slope upward from the inboard side of the hull portion to the outboard side of the hull portion. Such upward slope of the bottom of each hull portion sheds water and waves to the outboard sides of the vessel as it travels through the water in order to minimize the amount of water and spray that is directed upward between the individual hull portions towards the passengers. The rear portions of each such hull portion define an angled slope along both inboard and outboard sides, which angled slopes allow the rear portion of the watercraft to slide and drift sideways along the surface of the water as the watercraft turns. The flat catamaran hull portions and deck of the watercraft are preferably of unibody construction, such that they are formed (e.g., molded or otherwise machined) in a single, one-piece assembly.

A wave attenuator system for protecting a floating dock or other structure from incoming wake created by wind or vessel is disclosed herein, in various aspects. The wave attenuator system may include a substantially rectangular curtain made of a water-impermeable flexible material, in various aspects. The curtain top edge may be secured along the length of at least one of the sides of a dock, in various aspects. The curtain bottom edge may be suspended in a body of water a predetermined distance below the water surface, in various aspects. The bottom edge may include a weighted material to maintain the curtain in a substantially vertical orientation, in various aspects. The wave attenuator system is operable to redirect waves impacting the curtain downward to reduce wave action against the dock or other structure, in various aspects.

A porous-structure device includes a semi-submersible platform consisting of four columns, two pontoons, two horizontal supports and a deck. Fillets on middle portions of the columns have a square section, a radius of the fillets, close to the deck and the pontoons, of the columns is gradually decreased to 0, a porous device is disposed outside each column and is formed by combining and connecting four single components, and each single component is formed by combining and connecting a plurality of porous laminated plates and a plurality of connecting pieces. The parameters, such as the pore type, porosity, number of layers, interlayer spacing and installation height, of the porous laminated plates are set according to the wave characteristics in different sea areas.

The present invention discloses a floatable flow-resisting and sand-resisting multi-functional device. The device includes a hollow floatable body, a flow-resisting and sand-resisting plate, a flow-resisting and sand-resisting net and a mooring system, wherein a plurality of flow-resisting and sand-resisting plates are arranged, each of the flow-resisting and sand-resisting plates is arranged perpendicular to a seabed, a top end of the flow-resisting and sand-resisting plate is fixed to the bottom of the hollow floatable body, the flow-resisting and sand-resisting net down to the seabed is mounted between every two of the flow-resisting and sand-resisting plates, one end of the mooring system is connected to the hollow floatable body, and the other end of the mooring system is fixed to the seabed.

The present invention discloses a floatable flow-resisting and sand-resisting multi-functional device. The device includes a hollow floatable body, a flow-resisting and sand-resisting plate, a flow-resisting and sand-resisting net and a mooring system, wherein a plurality of flow-resisting and sand-resisting plates are arranged, each of the flow-resisting and sand-resisting plates is arranged perpendicular to a seabed, a top end of the flow-resisting and sand-resisting plate is fixed to the bottom of the hollow floatable body, the flow-resisting and sand-resisting net down to the seabed is mounted between every two of the flow-resisting and sand-resisting plates, one end of the mooring system is connected to the hollow floatable body, and the other end of the mooring system is fixed to the seabed.

A porous-structure device includes a semi-submersible platform consisting of four columns, two pontoons, two horizontal supports and a deck. Fillets on middle portions of the columns have a square section, a radius of the fillets, close to the deck and the pontoons, of the columns is gradually decreased to 0, a porous device is disposed outside each column and is formed by combining and connecting four single components, and each single component is formed by combining and connecting a plurality of porous laminated plates and a plurality of connecting pieces. The parameters, such as the pore type, porosity, number of layers, interlayer spacing and installation height, of the porous laminated plates are set according to the wave characteristics in different sea areas.

A self-propelled offshore installation vessel (1) operates at an offshore position and has at least one water pump (27) being operable to pump water from a water inlet opening (22) to a water outlet opening (25) via water conduit pipes (24). The water system can eject water out through the water outlet opening(s), whereby the ejected water interacts with the waves to dampen waves in an affected area (35) of the sea at the self-propelled offshore installation vessel (1).

A pontoon boat includes first and second pontoons on the port and starboard sides of the boat and a main deck attached to the top of the pontoons. A front wave deflector extends forwards and upwards from the front of the main deck at an angle. The front wave deflector is held above the water and does not contact the water while the pontoon boat is floating in or moving through calm water. The front wave deflector contacts the tops of waves when the pontoon boat is navigating rough water and pushes the water beneath the pontoon boat deck. This allows the pontoon boat to navigate rough water without loss of momentum and without excessive up and down pitching.

A pontoon boat includes first and second pontoons on the port and starboard sides of the boat and a main deck attached to the top of the pontoons. A front wave deflector extends forwards and upwards from the front of the main deck at an angle. The front wave deflector is held above the water and does not contact the water while the pontoon boat is floating in or moving through calm water. The front wave deflector contacts the tops of waves when the pontoon boat is navigating rough water and pushes the water beneath the pontoon boat deck. This allows the pontoon boat to navigate rough water without loss of momentum and without excessive up and down pitching.