An integrated method for clearance, collection and capture of internal pollutants and algae at the bottom of a lake include the following steps: selecting areas where the pollution level is high, and organic or inorganic particulate matter is prone to accumulation and carrying out trenching operations at the bottom of the lake to form a plurality of traps; and removing the sludge and algae inside the traps and clearing the sediment inside the traps, for subsequent internal pollution control when the surface-layer sludge on both sides of the traps almost fills up the traps. This method makes use of the hydrodynamic disturbances of waves formed by natural wind energy and lake currents to continuously transport sludge with a high pollution level and a small specific gravity and algae in the surface layer of the lake bottom, which are rich in organic debris, to artificially built traps.

A system for excavating sediment deposits from water storage reservoirs that equalizes the mass flow of sediment entering the reservoir with the sediment mass in the combined discharge from a dredge and the reservoir outlet system to the downstream water course. One or more remote instrument stations located on the inflow streams to the reservoir collect data that is used by the dredge control system to adjust the mass flow output from the dredge using data collected from the remote reservoir outlet instrumentation located downstream of the reservoir.

A reservoir dredging assembly includes a dredging tube and at least one dredging device adapted to be installed to at least one secondary reservoir. The at least one dredging device includes a linking tube, an extending tube, a water gate, and a control unit. The linking tube is connected to the dredging tube for water in a primary reservoir, together with sediments deposited therein, to flow through. The extending tube has a top cutlet adapted to be located lower than the maximum water level of the primary reservoir. The water gate is mounted in the linking tube at a position downstream of the extending tube. The control unit is convertible between a first state for closing the water gate and a second state for opening the water gate.

A structure for restraining debris in a stream, including lateral walls, which delimit between them a flow section in a bed of the stream. This flow section includes an upper portion that includes set between the lateral walls, a structure for retaining material arriving from upstream, and a lower portion that identifies an opening for outflow.

The present invention relates to apparatuses, methods, and systems for removing sediment from waterway bottoms and pumping the sediment through pipelines. More particularly, the present invention relates to apparatuses, methods, and systems for sediment control and altering the average effective depth in a section of rivers, streams and channels for maintaining the navigability of waterways and coastal restoration. The apparatus and method of the present invention including a means for preventing and removing blockages of water flow in the pipelines.

The invention relates to a dredging method for dredging a navigation channel for guaranteeing a nautical depth of a navigation channel. The method comprises performing agitation for mobilizing sediment and displacing the mobilized sediment to a collector which is embedded in the bottom of the navigation channel, the collector being a trench in the navigation channel wherein the trench has, when not being filled with sediment, a bottom level positioned substantially deeper than the nautical depth of the navigation channel. The method also comprises, in a step different from said performing agitation dredging, after solidification of the sediment collected in the collector, removing the solidified sediment from the collector so that the collector again has a bottom level positioned substantially deeper than the nautical depth of the navigation channel.

A multi-layer device comprising a first substrate, a first electrically conductive layer on a surface thereof, and a first current modulating layer, the first electrically conductive layer having a sheet resistance to the flow of electrical current through the first electrically conductive layer that varies as a function of position.

A reservoir dredging assembly includes a dredging tube and at least one dredging device adapted to be installed to at least one secondary reservoir. The at least one dredging device includes a linking tube, an extending tube, a water gate, and a control unit. The linking tube is connected to the dredging tube for water in a primary reservoir, together with sediments deposited therein, to flow through. The extending tube has a top cutlet adapted to be located lower than the maximum water level of the primary reservoir. The water gate is mounted in the linking tube at a position downstream of the extending tube. The control unit is convertible between a first state for closing the water gate and a second state for opening the water gate.

A modular wave-break includes a wall, a base attached to the wall, and an anchor attached to the base. The wall includes a set of dissipating holes integrally formed in the wall and a set of passage holes integrally formed in the wall. Reinforcing structural rods may be embedded in the wall, the base, and the anchor to provide strength. Mounting holes in the base enable the modular wave-break to be secured to a water bottom surface. Multiple modular wave-breaks may be interconnected to form a single wave-break. In an alternate embodiment, a water control structure provides for management of the water table of a wetland area. The water control structure includes a panel comprising a wall, a base attached to the wall, an anchor attached to the base, and a flow hole through the wall. Multiple panels are connected in series to create a water tight water control structure.

The invention discloses an unpowered water purification system for a riverfront landscape constructed wetland, comprising a riparian wetland constructed along a lake-land ecotone of a river, lake-pond. The riparian wetland comprises a plurality of alternatively arranged wetland islands and watercourses formed between them. The bottom surface of the riparian wetland is lower than the normal water level of the river, lake-pond, and the upper surface of the wetlands is flush with the normal water level of the river, lake-pond. Plants are planted on the wetlands. A revetment is constructed between the riparian wetland and the river, lake-pond, and its upper surface is between the bottom surface of the riparian wetland and the upper surface of the wetlands. The invention achieves good purification and landscape effects. The purification system has some advantages such as good landscape effects, simple management without energy and power consumption, and thus is durable and stable.