Glacial Lake Flood Control via Vertical Layered Check Dams
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing techniques fail to effectively prevent and control glacial lake outburst floods and debris flows at the watershed scale, posing significant threats to infrastructure and populations in high-altitude mountainous regions.
Innovation Solution
A method involving the planning and construction of check dams and hidden barriers to stabilize channels, dissipate flood energy, and divert flows through vertical layered holes, with pile-group dams and ground sills to manage sediment transport and prevent erosion, and a diversion dam to allocate discharge into drainage channels, minimizing damage to railways, highways, and residential areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flood control measures are used, then local flood damage can be reduced, but they fail to prevent cascading amplification and large-scale debris flows at the watershed scale
Solution Approach 1:
The watershed is divided into multiple zones (upstream, midstream, downstream) with different control measures implemented in each segment. Check dams are placed at specific locations to create discrete control points that collectively manage flood flow throughout the entire watershed, transforming a single-point solution into a distributed multi-segment system.
Solution Approach 2:
The solution transitions from traditional two-dimensional flood control (blocking flow paths) to a three-dimensional approach by introducing vertical layered holes in check dams and cascade drops that extend vertically through the channel cross-section. This multi-level structure enables simultaneous water-rock separation and energy dissipation across multiple vertical levels.
2Stability of the object's composition
If check dams and hidden barriers are constructed to obstruct debris flows, then channel stability improves, but flood discharge capacity is reduced
Solution Approach 1:
Different sections of the check dam are designed with different structures: vertical layered holes are provided in specific locations to allow controlled water passage, while other sections contain hidden barriers and cascade drops for debris flow obstruction. This localized differentiation enables simultaneous achievement of channel stability and adequate flood discharge capacity.
Solution Approach 2:
Vertical layered holes act as intermediary structures that allow selective passage of water while blocking debris flows. These holes serve as mediators between the flood discharge requirement and the debris flow obstruction need, enabling controlled water release without compromising channel stability.
3Loss of energy
If pile-group dams and ground sills are used to dissipate flood energy, then flow energy decreases, but construction cost and complexity increase
Solution Approach 1:
Cascade drops are arranged in a periodic sequence along the channel, creating a series of step-like structures that repeatedly dissipate flood energy through successive drops. This periodic arrangement distributes the energy dissipation function throughout the channel length, reducing the need for single large-scale energy dissipation structures.
Solution Approach 2:
The design merges multiple energy dissipation functions into integrated structures: pile-group dams combine with ground sills to form composite energy dissipation units, and cascade drops are integrated with check dams to create multi-functional structures that simultaneously obstruct debris flows and dissipate water energy.
4Object-affected harmful factors
If diversion dams are constructed to allocate discharge into drainage channels, then flood damage to infrastructure is reduced, but the system requires precise planning and coordination
Solution Approach 1:
The diversion dam system is designed with pre-calculated discharge allocation ratios and pre-positioned drainage channels that are ready to immediately divert floods away from infrastructure when needed. The planning phase establishes predetermined flow paths and discharge capacities, enabling rapid response without requiring complex real-time decision-making during flood events.
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
The method rapidly decreases peak discharge and flow energy, preventing cascading amplification of floods and debris flows, allowing for timely and effective mitigation of hazards to critical infrastructure and populations.
Implementation Method 1
the pile group and the placed boulders formed cascade drops to dissipate the energy of the floods and debris flows
Implementation Method 2
This method can rapidly decrease peak discharge and flow energy through water-rock separation and water flow dispersion
Implementation Method 3
Floods and debris flows can be smoothly drained downstream through vertical layered holes in check dams
Data Source
AI summary
The method for preventing and controlling glacial lake outbreak flood and related debris flows by the present invention is mainly controlling the scale of the floods by separating water and rocks and dispersing its energy step by step. The cascading amplification effects of floods can be reduced by controlling the initiation of source material with energy dissipation by using ground sills, groups of piles, and placed large stones and prefabricated artificial structures. The diversion dam built in the downstream area discharge floods in different layers, which can quickly guide water to the main river. The preconstructed engineering system can be used in a timely manner to prevent and control floods and debris flows induced by a sudden outburst of glacial lakes in areas with important facilities and inhabitants enduring the risk of natural hazards. Prevention and control systems can separate floods and debris flows and dissipate their energy. The groups of ground sills and check dams gradually dissipate the energy of floods, prevent high-energy boulders, and control the initiation of source materials in the channel and bank. Moreover, the systems can also separate the water and rocks in dilute debris flows or debris flows with high bulk densities but low viscosities. The diversion dams also enhance the separation function and keep the flood and debris flow discharge in the lower and upper channel to the main river.