Adjustable Hydraulic Head Sand Boil Filter

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Solution Overview

Problem

Sand boils pose a significant threat to levee stability during flooding events due to internal erosion, leading to potential breaches, and existing control methods like sandbags are cumbersome and may cause additional boils or blowouts.

Innovation Solution

A lightweight sand boil filter apparatus with a dual-layer cone mesh and adjustable exit openings, allowing for real-time hydraulic head adjustment to control seepage and prevent erosion, which can be installed by a single operator without sandbags.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stress or pressure

If sandbags are used to elevate the water level at the seepage exit, then the hydraulic head increases and erosion is reduced, but the device becomes cumbersome and may cause additional sand boils or blowouts

Engineering Contradiction:

Improvehydraulic headVSAvoidcumbersome structure

Core Design Contradiction:

Stress or pressureVSDevice complexity

Solution Approach 1:

The patent employs a porous filter cone made of mesh material that allows water to pass through while blocking eroded sediment particles. This porous structure enables the device to function as a hydraulic head regulator without requiring the cumbersome sandbag construction, thereby reducing device complexity while maintaining the ability to increase hydraulic head and prevent erosion.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The filter cone acts as an intermediary element between the seepage exit and the surrounding environment. It mediates the flow of water and sediment by allowing water to pass through while intercepting eroded material, thus controlling the hydraulic head and preventing the formation of additional sand boils or blowouts that would occur with traditional sandbag methods.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the water level is raised too high to control sand boils, then erosion is reduced, but additional sand boils or blowouts may form

Engineering Contradiction:

Improveerosion controlVSAvoidadditional sand boils or blowouts

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by using a filter cone with specific porous properties at the critical seepage exit location. The mesh structure provides localized filtration that controls erosion at the source without requiring excessive water level elevation that would trigger additional sand boils or blowouts elsewhere in the system.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The device converts the potentially harmful effect of high water pressure into a beneficial filtration process. By allowing water to pass through the porous filter cone while blocking sediment, the system uses the hydraulic pressure to enhance filtration effectiveness rather than risking the formation of additional sand boils, thus transforming a potential harm into a benefit.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If a filter cone with multiple mesh layers is used, then particle blocking is improved, but the device complexity increases

Engineering Contradiction:

Improveparticle blockingVSAvoiddual-layer mesh structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The filter cone is segmented into multiple mesh layers with different pore sizes, where each layer filters particles of specific sizes. This segmentation approach improves particle blocking reliability by providing multi-stage filtration, while the modular cone structure keeps the overall device relatively simple and easy to deploy compared to more complex filtration systems.

Inventive Principle:

Principle #1Segmentation

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 apparatus effectively increases the hydraulic head at the seepage exit, comparable to sandbags, and has been proven to control sand boils by blocking particles while allowing water to pass through, thereby preventing further erosion and potential breaches.

Implementation Method 1

a filter cone including an outer cone mesh and an inner cone mesh which is finer than the outer cone mesh

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 2

the additional hydraulic pressure will potentially slow down the flow and decrease the head difference or horizontal hydraulic gradient

Methodology Applied

Scientific EffectHydraulic pressure: Pressure Increase

Data Source

PatentUS11745122B2Sand boil filter with adjustable hydraulic head

Publication Date: 2023.09.05 UNITED STATES OF AMERICA THE AS REPRESENTED BY THE SEC OF THE ARMY

AI summary

In one embodiment, a sand boil filter apparatus has a filter cone including an inner cone mesh and an outer cone mesh, the inner cone mesh having a finer mesh than the outer cone mesh. A filter tube extends through the hollow interior of the filter cone. The filter tube includes a lower portion disposed below the open apex. The filter tube includes an upper portion disposed above the open base. The upper portion has a plurality of sets of exit openings which are spaced along a length of the upper portion to provide different possible exit heights for the plurality of sets of exit openings, each set including one or more exit openings disposed at an exit height of the filter tube. An exit height adjustment tool blocks all of the exit openings disposed below a set of unblocked exit openings selected to provide a corresponding exit height.