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The Collaborative International Dictionary
Nappe

Nappe \Nappe\, n. [F. nappe cloth, sheet. See Napery.] (Geom.) Sheet; surface; all that portion of a surface that is continuous in such a way that it is possible to pass from any one point of the portion to any other point of the portion without leaving the surface. Thus, some hyperboloids have one nappe, and some have two.

Wiktionary
nappe

n. 1 The profile of a body of water flowing over an obstruction in a vertical drop. 2 (context mathematics English) Either of the two parts of a double cone. 3 (context geology English) A sheet-like mass of rock that has been folded over adjacent strata. 4 (context hydraulics English) Nappe, the underside of which is not in contact with the overflow structure and is at ambient atmospheric pressure. 5 (context cooking English) The ability of a liquid to "coat the back of a spoon" or the act of coating a food.

Wikipedia
Nappe

In geology, a nappe or thrust sheet is a large sheetlike body of rock that has been moved more than or above a thrust fault from its original position. Nappes form in compressional tectonic settings like continental collision zones or on the overriding plate in active subduction zones. Nappes form when a mass of rock is forced (or "thrust") over another rock mass, typically on a low angle fault plane. The resulting structure may include large-scale recumbent folds, shearing along the fault plane, imbricate thrust stacks, fensters and klippe.

The term stems from the French word for tablecloth in allusion to a crumpled tablecloth being pushed across a table.

Nappe (disambiguation)

In geology a nappe is a complex recumbent fold system.

In geometry, a nappe is half of a double cone.

In engineering a nappe can also refer to a sheet of water flowing over a dam or similar structure.

In cooking, nappe refers to either the ability of a liquid to "coat the back of a spoon" or the act of coating a food (e.g. to nappe a leg of lamb with glaze).

Nappe (water)

The term Nappe when used in relation to hydro-engineering refers to the sheet of water over-topping a dam. It is an important issue in dam construction because unless air can be introduced into the nappe, the vibration of the water can lead to dam failure.

Nappe vibration can be managed by flow splitters in the dam wall design.

Nappe- The underside of which is not in contact with the overflow of structure and is at ambient atmospheric pressure.

Usage examples of "nappe".

She drew near the sacred Unghatti circle, the one place in all the village forbidden to all nappe, the outsiders.

Tikitu listened to the zip, zip, zip of the nappe darts as they sliced through the air.

Any hard radiation forward of the red-shifted meniscus intersects the nappe of the cone made by the field.