38 results about "Continental shelf" patented technology

Methods and systems for determining a geophysical position of an object in an underwater channel are provided. Acoustic signals from at least two sources are received by a receiver of the object. The acoustic signals have a frequency corresponding to at least one waveguide mode associated with the underwater channel, where the acoustic signals are transmitted at predetermined transmission times. An arrival time for the at least one waveguide mode is determined from the received signals, based on the predetermined transmission times. The geophysical position is determined based on the arrival time and a modal group velocity for the at least one waveguide mode.

The invention relates to a method for preparing sodium alginate from kelp, which adopts kelp as a raw material. The preparation process of the method comprises raw-material pretreatment, digestion, calcification, decalcification, dehydration, neutralization, drying, blending and milled-powder packaging, wherein flocculant is adopted for foamed floating during digestion. As the kelp is one of plants growing fastest in the world, the kelp can be cultured on a large scale in continental-shelf sea areas, and leaves of ripe kelp concentrating on the surface of seawater are beneficial to harvesting, so that production cost is reduced. The method also adopts the flocculant for foamed floating, thereby having the advantages of shortening floating time and improving product quality.

Areal population density and detailed behavior of fish schools and their interaction are continuously monitored over continental-shelf-scale areas spanning thousands of square kilometers by ocean acoustic-waveguide remote sensing. In some embodiments, the capacity of certain geophysical environments, such as contininental shelves, islands, etc. to behave as acoustic waveguides is utilized; sound propagates over long ranges via trapped modes that suffer only cylindrical spreading loss, rather than the spherical loss suffered in conventional sonar approaches.

A dynamic carbon and static carbon mutual conversion method includes: planting rank vegetations, and repeatedly cutting and storing to convert 'dynamic carbon' in the atmosphere into 'static carbon' in the biosphere; controlling biomass oxidation quantity to balance the total quantity of 'dynamic carbon' in the atmosphere; intervening soil wind erosion, rock weathering, monsoon circulation and ocean current distribution regularities to restrain 'static carbon' in the biosphere, the hydrosphere and the lithosphere from transferring into the atmosphere; increasing biomass in coastal wetlands, continental shelf shallow areas, rivers and lakes to promote 'static carbon' in the hydrosphere to transfer into the lithosphere; replacing fossil fuels with clean energy to reduce incremental quantityof 'dynamic carbon' in the atmosphere; developing new climate economy to increase bio-carbon products and increase storage of 'static carbon' in the biosphere; clearing 'dynamic carbon' in the atmosphere according to physical and chemical methods so as to regulate the greenhouse effect, eliminate dust haze, slow down global climate change speed and prolong survival time of human on the earth.

The invention facilitates provision of a point-to-point cable connection between first and second points separated by an extended span of water including a first region of shallow water and a second region of relatively deep water. A plurality of ducts are provided from the first point through the first region of the extended span to an offshore termination point between the first and second points. Preferably, the ducts are buried in the seabed to prevent damage. At least one first cable is placed in one of the plurality of ducts to provide a connection between the first point and the offshore termination point. A second cable from the second point is received at the offshore termination point. The first cable is connected to the second cable at the offshore termination point to create the point-to-point cable connection. In one embodiment, the offshore termination point is located on the continental shelf near the transition to deep water. Cable can be installed between the first point and the offshore termination point with relative ease by passing the cable through an available conduit. This eliminates the need for the time consuming and expensive permitting process typically associated with near-shore cable installation.

The invention discloses a self-balancing descending type seabed base, which is characterized by comprising a seabed base and a recovery instrument floating body, wherein the seabed base comprises a base body and a plurality of layers of guide plates, the guide plates are annularly distributed on the base body at intervals, and the guide plates are connected and fixed on the base body through reinforcing ribs; a cylindrical cavity with an upward opening is formed in the upper middle portion of the seabed base, the recovery instrument floating body is installed on the cylindrical cavity formed in the upper portion of the seabed base, and a closed cabin is formed between the recovery instrument floating body and the cylindrical cavity of the seabed base. Three ocean observation instruments including ADCP, CTD and a releaser are arranged in the instrument recovery bin. Water changing holes are designed on two sides of the instrument recovery bin, and a rope disc is arranged on the lower portion. The self-balancing descending type seabed base has the functions of net disengaging prevention, silting prevention, biological attachment prevention and self-balancing vertical descending landing, the laying steps are simplified, the observation success rate is increased, and the self-balancing descending type seabed base can be used for ocean element observation of sea areas such as bays,estuary, continental shelving and continental slopes.

The invention discloses a method for generating an extrapolation boundary of a continental shelf which is 200 nautical miles away and in particular relates to a method for generating a boundary of a continental shelf in the mode that based on a known fixed point, a certain distance is extrapolated outwards in a specific direction. The method comprises the following steps of: generating extrapolation arcs; intersecting the extrapolation arcs; cutting the extrapolation arcs; deleting internal arcs; and deleting surplus arcs, combining the extrapolation arcs and the like so as to realize the automatic generation of a line of FOS (factor of safety)+60M, a line of 350M and a line of 2500m+100M. The method has the advantages of accuracy in surveying and mapping data, convenience in operation, small influence of natural weather and the like in the process of coastal surveying and mapping and maritime delimitation in China.

The invention discloses an underwater anti-sliding cast-in-situ bored pile foundation and a construction method thereof. The underwater anti-sliding cast-in-situ bored pile foundation is used for underwater soft soil slopes on river alluvial plains, river estuaries and continental shelves, and is formed by sequentially sealing and connecting at least one section of novel steel protection barrel and at least one section of common steel protection barrel from bottom to top. The novel steel protection barrel comprises an inner barrel, an outer barrel and an automatic hole pressure adjusting system, through holes are evenly distributed in the barrel wall of the outer barrel in the circumferential direction, and the through holes are located in an underwater soft soil layer. According to the underwater anti-sliding cast-in-situ bored pile foundation and the construction method thereof, the pore water pressure in peripheral soil can be automatically adjusted at the construction stage and theoperation stage of the underwater anti-sliding cast-in-situ bored pile foundation; when penetration of the steel protection barrel in the construction process is difficult, pressurized water injection is carried out in a cavity of the novel steel protection barrel, the peripheral soil is softened, the penetration resistance of the steel protection barrel is reduced, and the mounting efficiency isimproved; and when the super-static pore water pressure in the operation process exceeds a pore water pressure prewarning value capable of causing soil shear failure, an alarm gives an alarm, and a water pump is started to draw water.

The invention provides a method for measuring the wave velocity and wavelength of ocean waves. The method comprises the following steps: arranging two rods (L1 and L2) for measuring the sea water level on continental shelf, wherein the distance between L1 and L2 is L; measuring and recording the difference (t1) of time when an ocean wave reaches L2 and L1 in sequence; according to a formula: speed=distance/time (V=L/t1), calculating the wave velocity; then measuring and recording the difference (t2) of time when two neighbored waves reach L1, and according to a formula: distance=speed*time, calculating the wavelength: lambda=V*t2,. The method can measure the height of ocean waves, is capable of measuring the velocity, wavelength, and seawater level, and has the advantages of simple structure, low cost, easy operation, rapid response, stable property, convenience, practicality, and long service life, and thus is easy to popularize.

The invention provides a building method of a mineshaft for exploring natural gas hydrate. The method comprises the steps of: manufacturing a plurality of cylindrical prefabricated parts before the natural gas hydrate is explored, wherein a plurality of prefabricated holes are reserved at the middle parts of prefabricated blocks at the upper parts of the cylindrical prefabricated parts, the lower parts of the cylindrical prefabricated parts are provided with connecting columns, a layer of seal material is arranged on each connecting column to prevent sea water from flowing into the mineshaft, and the prefabricated holes exactly correspond to the connecting columns; digging the mineshaft on a continental shelf at the bottom of the sea; building a mineshaft base around the mineshaft on the continental shelf at the bottom of the sea, wherein prefabricated holes are also reserved at the upper part of the mineshaft base; suspending the cylindrical prefabricated parts on an exploring platform and putting the cylindrical prefabricated parts into the mineshaft base at the bottom of the mineshaft, so that the connecting columns are exactly put in the prefabricated holes on the mineshaft base; and connecting the residual cylindrical prefabricated parts with one another in the same way till reaching the sea surface, and finally completing the building of the mineshaft.

The invention provides a continental shelf profile determination method and device based on non-delta sea invasion. The continental shelf profile determination method based on non-delta sea invasion comprises the steps of establishing a continental shelf profile two-dimensional model according to the river supply sediment volume and the sea level rising rate of a target work area; under a space rectangular coordinate system, solving the mainland profile two-dimensional model to generate a relational expression capable of representing a non-delta sea invasion gradient and a river length; and determining the continental shelf profile of the target work area according to the relational expression. According to the method and the device for determining the continental shelf section based on the non-delta sea invasion, under the background of the non-delta sea invasion, the influence of river sediment supply and sea level rise on the continental shelf section is comprehensively considered, so that the change condition of the continental shelf section in the historical period of the target work area is more accurately determined.

The invention relates to a marine ecological zoning method, which comprises dividing ecological zones from one stage to four levels, wherein the first-level ecological zone is divided into three first-level ecological zones of the Yellow Sea, the East Sea and the South Sea; the second-level ecological areas include the Yellow Sea second-level ecological area, the East China Sea second-level ecological area and the South China Sea second-level ecological area. The third-level ecological area is divided into the Bohai Sea, the northern Yellow Sea, the southern Yellow Sea, the East Sea continental shelf, the Chinese Taiwan strait and the northern part of the Southern Sea. According to the fourth-level ecological area, the northern bay near-shore ecological area in the third-level ecological area is selected on the basis of the third-level ecological area to be subjected to a fourth-level partition test. According to the invention, an ecological zoning method is established from different scales by applying classification elements of different levels; the method defines first to fourth levels of marine ecological regions; the similarity and difference rules of the ocean areas are revealed; dominant features of various ecological regions are determined; spatial marine ecological early warning and monitoring work is supported, and biodiversity protection and important ecological system protection of key areas are promoted.

The invention provides a method for exploring natural gas hydrate. The method comprises the steps of: manufacturing a plurality of cylindrical prefabricated parts before the natural gas hydrate is explored, wherein a plurality of prefabricated holes are reserved at the middle parts of prefabricated blocks at the upper parts of the cylindrical prefabricated parts, the lower parts of the cylindrical prefabricated parts are provided with connecting columns, a layer of seal material is arranged on each connecting column to prevent sea water from flowing into the mineshaft, and the prefabricated holes exactly correspond to the connecting columns; digging the mineshaft on a continental shelf at the bottom of the sea; building a mineshaft base around the mineshaft on the continental shelf at the bottom of the sea, wherein prefabricated holes are also reserved at the upper part of the mineshaft base; suspending the cylindrical prefabricated parts on an exploring platform and putting the cylindrical prefabricated parts into the mineshaft base at the bottom of the mineshaft, so that the connecting columns are exactly put in the prefabricated holes on the mineshaft base; and connecting the residual cylindrical prefabricated parts with one another in the same way till reaching the sea surface, and finally completing the building of the mineshaft.