A composite silt fence configured for capturing pollutants in one embodiment comprises a silt fence fabric including i) a polymeric geotextile fabric particulate filtering layer defining the hydraulic flow capacity for the silt fence, ii) a pollutant capturing layer coupled to the polymeric geotextile fabric particulate filtering layer and configured to capture some select pollutants in water from flow that has passed through the polymeric geotextile fabric particulate filtering layer, and iii) a backing layer coupled to the pollutant capturing layer; and a plurality of stakes secured to the silt fence fabric at spaced locations. The silt fence fabric yields higher hydraulic flow than existing fence constructions with greater sediment retention and pollutant containment features.

Provided is a technique for preventing repeated river, storm surge, and tsunami disasters. “Sea hollow (UTSURO)” is constructed at an estuary, violent tide is generated in an estuary basin water area of a river, ebb and flow energy is caused to exceed flow energy due to gravity in a downstream part of the estuary flow are conventionally dominated by the flow energy due to gravity, the flow energy in the river is thus redistributed to deeply dig the riverbed, enhance flood discharge ability, and prevent repeated river disasters, a levee body of the “sea hollow (UTSURO)” is shared, tsunami or storm surge is reflected in a coastal sea area and is prevented in the sea area, tsunami or storm surge invading the estuary, or estuary flood is caused to overflow into an upstream migration water path constituting the “sea hollow (UTSURO)”, and peak cut thereof is performed.

Provided is a technique for preventing repeated river, storm surge, and tsunami disasters. “Sea hollow (UTSURO)” is constructed at an estuary, violent tide is generated in an estuary basin water area of a river, ebb and flow energy is caused to exceed flow energy due to gravity in a downstream part of the estuary flow are conventionally dominated by the flow energy due to gravity, the flow energy in the river is thus redistributed to deeply dig the riverbed, enhance flood discharge ability, and prevent repeated river disasters, a levee body of the “sea hollow (UTSURO)” is shared, tsunami or storm surge is reflected in a coastal sea area and is prevented in the sea area, tsunami or storm surge invading the estuary, or estuary flood is caused to overflow into an upstream migration water path constituting the “sea hollow (UTSURO)”, and peak cut thereof is performed.

A dynamic fluid flow control structure is provided that allows precise control over fluid flow using a series of two or more orifices, at least one of which may be reconfigured to change its flow characteristics. A flood control system and a flood control process are provided that emulate a preset discharge profile over time. Some versions of the structure, process, and system can be used to provide controlled storm discharge patterns in a developed area that emulate the natural pre-development discharge patterns.

A dynamic fluid flow control structure is provided that allows precise control over fluid flow using a series of two or more orifices, at least one of which may be reconfigured to change its flow characteristics. A flood control system and a flood control process are provided that emulate a preset discharge profile over time. Some versions of the structure, process, and system can be used to provide controlled storm discharge patterns in a developed area that emulate the natural pre-development discharge patterns.

A sediment retaining structure in water courses including a net which is arranged transversely so as to occupy all the bed of the water course. At least one opening having a width less than the width of the bed is formed on the bottom of the net which delimits at least one side thereof.

A treatment method for a river system in a reservoir area, comprising: S1. determining whether a time from a current date to the rainy season is less than a preset duration; S2. moving a pressure sensor upward; S3. determining whether the pressure data meets corresponding conditions; S4. determining whether a duration of the pressure data is less than the preset duration; S5. determining whether an interval between the current time and the time for collecting pressure/nitrogen and phosphorus is greater than a preset number of days; S6. acquiring an image information of a river bottom, and sending it to neural network model for identification to obtain a depth of a sludge; S7. determining whether the depth of a sludge has reached a dredging depth, if so, starting a sludge pump to clean up; S8. collecting nitrogen and phosphorus concentration, and removing nitrogen and phosphorus when the concentration exceeds a standard.

A treatment method for a river system in a reservoir area, comprising: S1. determining whether a time from a current date to the rainy season is less than a preset duration; S2. moving a pressure sensor upward; S3. determining whether the pressure data meets corresponding conditions; S4. determining whether a duration of the pressure data is less than the preset duration; S5. determining whether an interval between the current time and the time for collecting pressure/nitrogen and phosphorus is greater than a preset number of days; S6. acquiring an image information of a river bottom, and sending it to neural network model for identification to obtain a depth of a sludge; S7. determining whether the depth of a sludge has reached a dredging depth, if so, starting a sludge pump to clean up; S8. collecting nitrogen and phosphorus concentration, and removing nitrogen and phosphorus when the concentration exceeds a standard.

A method for transferring sediment in a body of water, a discharge element being situated in the body of water, which is connected to a hydroelectric power station by a connecting line in such a way that water may flow through the connecting line, and a device for providing a sediment/water mixture into the connecting line, and the device including a monitor for monitoring the sediment concentration in the provided sediment/water mixture, and a controller connected to the device to control the quantity of the sediment contained in the sediment/water mixture, and the method including: taking sediment; transferring sediment to the device for providing a sediment/water mixture; introducing the sediment/water mixture into the connecting line, the controller activating the device in such a way that the sediment quantity introduced per time interval does not exceed a predefined maximally permissible quantity, the maximally permissible sediment quantity depending on the instantaneous operating mode of the hydroelectric power station.

A composite silt fence configured for capturing pollutants in one embodiment comprises a silt fence fabric including i) a polymeric geotextile fabric particulate filtering layer defining the hydraulic flow capacity for the silt fence, ii) a pollutant capturing layer coupled to the polymeric geotextile fabric particulate filtering layer and configured to capture some select pollutants in water from flow that has passed through the polymeric geotextile fabric particulate filtering layer, and iii) a backing layer coupled to the pollutant capturing layer; and a plurality of stakes secured to the silt fence fabric at spaced locations. The silt fence fabric yields higher hydraulic flow than existing fence constructions with greater sediment retention and pollutant containment features.