36results about How to "Reduce water depth" patented technology

A device for cultivating and maintaining aquatic crustaceans and the method for the same are provided, whereby aquatic crustaceans are cultured in a culture tank having at least one effective resting and/or hiding area that provides visual only or both visual and tactile sensations for aquatic crustaceans. The present invention creates effective resting and/or hiding areas by utilizing the sensitivity of aquatic crustaceans to physical environment, thereby allowing aquatic crustaceans to live within confined spaces in high densities without cannibalizing those fall outside the effective resting and/or hiding areas (the non-effective habitat areas). The device of the present invention can cultivate and maintain aquatic crustaceans successfully in shallow waters and a plurality of which may be vertically incorporated into a multi-layered culture system to bring about higher culture and maintenance densities per unit floor area.

The invention relates to a deepwater closure method of water conservancy and hydropower engineering, in particular to a closure method capable of avoiding deepwater dyke end slump. The closure method includes: determining the range of bedding course according to the cross section shape of reiver channels and cofferdam layout; determining location of a positioning ship according to water flow, water depth and type of throwing materials within the scope of the bedding course and then determining throwing position of a barge hopper according to the location of the positioning ship; throwing a great quantity of throwing materials underwater at one step at a throwing position by a large-tonnage barge hopper and throwing the materials in a staggered manner properly in a transverse direction and a longitudinal direction of the barge hopper; enabling the fill level of the bedding course within a range of a closure banquette to be higher than the fill level within a range of a cut-off wall of an upstream side weir body to form a high-and-low bucket structure until reaching a preset fill level, and so as to prevent water from scouring the throwing materials on the banquette directly and reduce loss of the throwing material during flooding. By the closure method, dyke end slump during attacking and filling process to the closure banquette and the weir body due to use of the direct attacking and filling method is avoided, safety of personnel and machinery is guaranteed, while the requirement of navigation during the construction period of the bedding course can be met.

A coastal recovery module including a body portion defining an interior compartment. The coastal recovery module may also include a selectively sealable fluid conduit. The selectively sealable fluid conduit may provide a fluid communication between the interior compartment and an exterior of the body portion, the fluid conduit configured for selectively flooding and dewatering the interior compartment. The coastal recovery module may further include a wave energy mitigation structure associated with at least a portion of a top surface of the body portion.

The invention provides an underflow energy dissipation structure for allowing flaring piers to extend to a stilling basin. The underflow energy dissipation structure comprises the stilling basin, themultiple flaring piers, multiple gate holes and flow diverting piers; the stilling basin is arranged on the downstream side of a gate pier; the multiple flaring piers and the multiple gate holes are arranged at the outlet end of the gate pier at intervals; the flow diverting piers are located in the stilling basin and directly face outlets of the gate holes, and the quantity of the flow divertingpiers is consistent with that of the gate holes; the upstream edges of the flow diverting piers and the tail ends of the flaring piers are located on the same horizontal line; the upstream starting width of the flow diverting piers is equal to the width of the outlets of the gate holes directly facing the flow diverting piersl; and the height of the flow diverting piers is 1/5-1/3 of the water depth of the outlets of the gate holes. According to the scheme, the flow diverting piers are arranged at the outlets of the gate holes, water flow drained through the gate holes is quickly and transversely diffused under the micro stirring and flow guiding effects of the flow diverting piers, water flow streams collide with one another to achieve energy dissipation, the energy dissipation pressure of the stilling basin is effectively reduced, therefore, the design size of the stilling basin can be decreased, and the engineering cost is reduced.

An outdrive for a marine vessel, such as a watercraft having an inboard engine, is provided. The outdrive can include a standoff box joined with a drive unit having a driveshaft that rotates in response to rotation of an input shaft coupled to an engine within a hull of the watercraft. The drive unit includes a propeller shaft that rotates in response to rotation of the driveshaft, and an associated propeller. The drive unit is vertically movable from a raised mode to a lowered mode, in which the propeller shaft is a preselected distance from a bottom of the boat hull, thereby lowering a thrust point produced by the propeller, all while the watercraft is moving through water and while the propeller is producing thrust. A related method and standoff box are also provided.

The invention discloses a flow velocity measurement system based on a sensor network. The flow velocity measurement system comprises a data processing and analysis module, a sensor power supply, an interruption signal generator and a flow velocity sensor network formed by multiple flow velocity sensors. Artificial participation is basically not required in the whole process so that full-automatic measurement and display of flow velocity distribution in space range can be realized; the flow velocity sensors can be arranged in a cylindrical surface according to the actual requirements so that the measurement process is enabled to further meet the actual requirements; the flow velocity sensors are fixedly installed, and space coordinate points are uniquely determined so that flow velocity measurement is more accurate; and influence of water depth and altitude is greatly reduced, and flow velocity within large space range can be measured by the sensors fixed on a sensor installing bracket.

The invention discloses a channel water metering device and method. The device is arranged on an original channel, and is characterized by comprising a widening channel, wherein the widening channel is divided into three areas, namely, an intake water pool area, a water pipe laying area and an outlet water pool area; the water pipe laying area is composed of a row of pipelines which are sealed byconcrete; a non-full pipe electromagnetic flowmeter is arranged on one of the pipelines; and the total flow area of the pipelines in the water pipe laying area is larger than that of the original channel. Through adoption of the channel water metering device, pipeline metering of channels is realized. Through arrangement of multiple pipelines, the flow of water is not reduced, and the diameters ofthe pipelines can be reduced. Small instruments are easier to install and replace, so that the cost of instruments is lowered, and popularization is facilitated.

An outdrive for a marine vessel, such as a watercraft having an inboard engine, is provided. The outdrive can include a standoff box joined with a drive unit having a driveshaft that rotates in response to rotation of an input shaft coupled to an engine within a hull of the watercraft. The drive unit includes a propeller shaft that rotates in response to rotation of the driveshaft, and an associated propeller. The drive unit is vertically movable from a raised mode to a lowered mode, in which the propeller shaft is a preselected distance from a bottom of the boat hull, thereby lowering a thrust point produced by the propeller, all while the watercraft is moving through water and while the propeller is producing thrust. A related method and standoff box are also provided.

The invention discloses an apparatus for removing temporary hardness in water during tower type water fall. The apparatus is used for solving the problems that water having high temporary hardness generates precipitates, forms water scales and the like after being boiled. The apparatus is divided into three stages according to the difference of water purifying units, wherein each pipeline is formed by connecting with flanges; the apparatus is divided into an acid adding and mixing unit, a water fall carbon-removing unit and a water collecting unit. A chemical agent added in the acid adding and mixing unit is hydrochloric acid, the mixing is for a purpose of realizing sufficient mixing reaction of raw water and the chemical agent, and the acid adding and mixing unit has an effect of removing HCO<3-> from water; the water fall carbon-removing unit aims at removing CO2, which is dissolved in water, generated in the reaction of the acid adding and mixing unit; the water collecting unit has an effect of collecting treated water and adding a chemical agent (sodium hydroxide) to adjust pH value to a normal level. The apparatus is compact in connection of various functional units, simple in principle and convenient to mount and dismount, and has high scale removal rate against raw water having high temporary hardness, and the scale of the apparatus can be adjusted according to different requirements.

The invention discloses an arc-shaped division type stilling pool. The arc-shaped division type stilling pool sequentially comprises an initial section in which current drainage is designed in an inwards-shrinking arc shape, a stilling pool middle section designed by wavy side walls and a semicircular prominent bottom face and a stilling pool tail section designed by a rectangular slope surface. The arc-shaped division type stilling pool is used for hydropower station downstream energy dissipation, drained current energy can be remarkably reduced, the energy dissipation efficiency is improved,the engineering safety is guaranteed, and economic benefits are increased.

The invention relates to a sewage treatment tank, a sewage circulating treatment method and a sewage circulating treatment system. The sewage treatment tank comprises a water purification vegetation area (2), and a solid particle filtering area (5) combined with the water purification vegetation area (2), wherein a water inlet (1) is formed in the upstream end of the water purification vegetationarea (2) in the length direction of the water purification vegetation area (2); a clear water area (3) and a microbial decomposition area (4) are arranged at the downstream end of the water purification vegetation area (2); and the water purification vegetation area (2), the clear water area (3) and the microbial decomposition area (4) communicate with one another in pairs. Particularly, the sewage treatment tank is provided with a water outlet (9), and a pressure pump (10) is used for guiding water to a pressure water tank (11); the pressure water tank (11) is used for guiding the water to water consumption equipment (12), and the water flows through a primary separation area (13) and flows into the sewage treatment tank; and the water flows to a membrane tank filtering area and then flows to the sewage treatment tank, so that the sewage circulating treatment method and the sewage circulating treatment system are formed. The oxygen content of the water can be increased.