Hydraulic Jet Sediment Resuspension for Marsh Elevation
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Solution Overview
Problem
Tidal marshes are experiencing a sediment deficit due to rising sea levels and reduced sediment discharge, leading to land loss and ecosystem disruption, with existing restoration methods being costly, locally focused, and potentially harmful to estuaries.
Innovation Solution
A method involving the use of a high-pressure water stream, pumped from subtidal water areas, to resuspend sediment from the bottom surface during incoming tides, increasing sediment concentration and deposition on marsh surfaces, which can be directed by a surface vessel to target areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional sediment diversions are constructed to supply sediment to marshes, then sedimentation rates increase, but the cost of implementation increases and the system becomes fixed in place with limited flexibility
Solution Approach 1:
The invention uses a hydraulic jet system to resuspend sediment from the bottom surface into the water column. High-pressure water jets are directed at the sediment, utilizing hydraulic force to dislodge and suspend particles, which then settle onto the marsh surface. This hydraulic approach replaces complex mechanical diversion structures with a more flexible jet-based system.
Solution Approach 2:
The system transitions from fixed diversion structures to a dynamic, movable platform that can be repositioned as needed. The platform with jet nozzles can move to different locations to treat various areas, providing adaptability and flexibility while maintaining effective sediment delivery to marshes.
2Productivity
If sediment diversions are constructed to restore marshes, then sedimentation rates increase, but the implementation cost increases significantly
Solution Approach 1:
By using hydraulic jets instead of constructing permanent concrete or earthen diversion structures, the system reduces material and construction costs. The hydraulic approach uses water pressure to achieve sediment resuspension, eliminating the need for expensive engineered structures while maintaining sediment delivery effectiveness.
Solution Approach 2:
The system utilizes existing tidal water flows and natural sediment sources, requiring minimal external energy input or infrastructure. The platform moves with tidal currents and uses the natural hydrodynamics of the estuary to deliver sediment, reducing the need for powered pumps or complex mechanical systems.
3Productivity
If traditional diversion methods are used to supply sediment, then sedimentation rates increase, but the system lacks flexibility and adaptability to different locations
Solution Approach 1:
The system employs a movable platform that can be repositioned to different locations within the estuary. This dynamic design allows the sediment delivery system to adapt to varying marsh restoration needs, target specific areas requiring elevation, and respond to changing environmental conditions, unlike fixed diversion structures.
Solution Approach 2:
The platform design integrates multiple functions: sediment resuspension via hydraulic jets, sediment delivery to marshes, and potential channel dredging capabilities. This multi-functional system can serve various restoration objectives across different locations, enhancing versatility while maintaining effective sedimentation rates.
4Quantity of substance
If high-pressure water streams are used to resuspend sediment, then sediment concentration increases, but energy consumption increases
Solution Approach 1:
The hydraulic jet system operates in periodic pulses rather than continuously, directing high-pressure water streams at intervals to resuspend sediment. This periodic operation reduces overall energy consumption compared to continuous jetting, while still achieving sufficient sediment concentration in the water column for effective marsh restoration.
Solution Approach 2:
The system utilizes the natural tidal flow and gravitational forces to assist sediment transport after resuspension. Once sediment is lifted into the water column by hydraulic jets, the existing tidal currents and gravity facilitate its transport and deposition onto the marsh, reducing the need for additional energy input.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively increases sedimentation rates on marsh surfaces, enhancing elevation and resilience to sea-level rise, while being more flexible and environmentally friendly than traditional diversion methods.
Implementation Method 1
directing a high-pressure water stream, using the water pumped from the subtidal water area, to the bottom surface of the subtidal water area during an incoming tide period. The high-pressure water stream impacts the bottom surface of the subtidal water area with sufficient force to dislodge sediment from the bottom surface into the subtidal water area.
Data Source
AI summary
Methods for restoring tidal areas adjacent to a tidal water area are provided. The method can comprise: pumping water from the tidal water area; and directing a high-pressure water stream, using the water pumped from the tidal water area, to the bottom surface of the tidal water area during an incoming tide period. The high-pressure water stream impacts the bottom surface of the tidal water area with sufficient force to dislodge sediment from the bottom surface into the tidal water area.