engineering

KOLOS

KOLOS is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand KOLOS rather than just read about it. In short: KOLOS is a wave-dissipating concrete block intended to protect coastal structures like seawalls and breakwaters from the ocean waves. These blocks were developed in India by Navayuga Engineering Company and were first adopted for the breakwaters of the Krishnapatnam Port along the East coast of India.

Key takeaways

KOLOS belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect KOLOS to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of KOLOS from memory before moving on to harder problems.

Reference excerpt

KOLOS is a wave-dissipating concrete block intended to protect coastal structures like seawalls and breakwaters from the ocean waves. These blocks were developed in India by Navayuga Engineering Company and were first adopted for the breakwaters of the Krishnapatnam Port along the East coast of India.

Design KOLOS has been conceptualized by incorporating structural improvements to existing armour units, Dolos. The common failure modes for Dolos were found to be either at the shank due to torsion and at the fluke by bending-induced shear. The higher structural stresses are caused largely due to the longer lever arm. The elongated shank length of the Dolos was shrunken by 21.4% in KOLOS. The material thus saved compensates for thickening the legs of KOLOS. KOLOS is characterized by a central shorter concrete member and two outer elongate concrete members connected on opposites sides of the central member. The outer members have parallel longitudinal axes extending normal to the longitudinal axis of the central member. These members have an octagonal cross-section and are further configured such that their cross-sectional area decreases from its intermediate portion towards opposite ends thereof.

Casting and transportation KOLOS are fabricated using plain cement concrete. To fabricate KOLOS, three piece steel moulds are used which facilitate easy de-moulding. De-moulding is usually carried out after 24 hours of concrete casting. A single KOLOS unit can weigh from 1.5 tons to 12 tons. Lifting the units is done after three days of curing. The units are transferred from the casting bed to the stacking yard. Lifting of the units is done by slinging and hoisting with a crane. Trucks are used for the short haul to the breakwater.

Placement KOLOS are randomly placed on rubble mound breakwaters in two layers. Like most of the concrete armour units, the hydraulic stability of KOLOS is dictated by its self weight and interlocking with surrounding units. KOLOS is found to have almost the same level of porosity as Dolos with a layer coefficient of 1. The random placement of the units facilitates increased rate of placement and less dependence on complex placement techniques. A damage level of 0.5% is allowable in the design of KOLOS armour layer without inflicting damage to the underlayers of the breakwater.

See also Artificial reef – Human-made underwater structure that functions as a reef Breakwater (structure) – Coastal defense structure Coastal management – Preventing flooding and erosion of shorelines Coastal erosion – Displacement of land along the coastline Ocean surface wave – Surface waves generated by wind on open waterPages displaying short descriptions of redirect targets Seawall – Form of coastal defence Xbloc – Concrete breakwater element Dolos – Concrete breakwater element Tetrapod – Concrete breakwater element Accropode – Concrete breakwater element

References

External links POSIBLOC™ system for placement aid of concrete blocks

Illustrations

KOLOS: 3D view of KOLOS — 3D view of KOLOS

Worked examples

Example 1 — a first encounter with KOLOS

Start with the simplest possible case. Write down what KOLOS claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to KOLOS before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about KOLOS ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of KOLOS

In research: KOLOS appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses KOLOS in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: KOLOS is common in secondary-school and first-year university syllabi. It links to neighbouring topics Coastal engineering, Indian inventions, Wave-dissipating concrete blocks, so understanding it makes those chapters shorter.
In everyday life: Look for KOLOS outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study KOLOS in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what KOLOS means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain KOLOS out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is KOLOS in simple terms?

Why does KOLOS matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study KOLOS?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on KOLOS.