hummock


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hummock

1. a hillock; knoll
2. a ridge or mound of ice in an ice field
3. Chiefly southern US a wooded area lying above the level of an adjacent marsh

Hummock

 

a pileup of fragments of ice floes on the ice cover of seas, rivers, and lakes. Hummocks are caused by the lateral pressure of ice fields on one another and on the shoreline and shoals, which results in fragmentation of the edges of the fields. Hummocks are most common in the East Siberian and Chukchi seas and in the open part of the Arctic Ocean, where their height sometimes exceeds 8–9 m (in coastal areas it may reach 15–20 m).

Among the forms of hummock development that are distinguished are ridges (in solid drifting ice), barriers (hummock ridges on the margin of the shore ice, occasionally resting on the bottom), standing floes (ropaks), and stamukhi (individual pile-ups on shoals). The degree of development of hummocks is measured on a five-point scale; 0 indicates a completely smooth ice sheet, and 5 means that the ice sheet is completely covered with hummocks.

hummock

[′həm·ək]
(ecology)
A rounded or conical knoll frequently formed of earth and covered with vegetation.
(geology)
A rounded or conical knoll, mound, hillock, or other small elevation, generally of equal dimensions and not ridgelike. Also known as hammock.
(hydrology)
A mound, hillock, or pile of broken floating ice, either fresh or weathered, that has been forced upward by pressure, as in an ice field or ice floe.
References in periodicals archive ?
Atmospheric mercury accumulation rates between 5900 and 800 calibrated years BP in the High Arctic of Canada recorded by peat hummocks.
Field samples were collected from hand-dug soil pits along the crest of sand dunes or hummocks as shown on LiDAR images.
Sedge hummocks surrounded by water were used for nesting at two sites, one in ephemeral pools in a flatwoods, and another in a groundwater seepage habitat.
rock glaciers, scree slopes, patterned ground, earth hummocks, debris cones, solifluction lobes and solifluction terraces.
The Wellington Plains bog [484950, 5849700 on map 8223-S (Tamboritha-Moroka), AMG 55] in the south Gippsland Alps was selected as it includes almost undisturbed areas containing the sequence of Sphagnum hummocks and hollows characteristic of intact bogs.
fuscum lawn (surrounded by an equally high peat surface), and hummock (about 1 [m.
Much of the peatland displays hummock-hollow microtopography with larger shrubs and many species of forbs confined principally to the hummocks (Lesica, 1986; McAllister, 1990).
Suddenly I deep-banked to avoid a snow ridge line, then nearly collided with an ice-glazed hummock.
To provide an additional access point prior to the Marriott Hotel, the walkway will head towards Lockwood Drive over Hummock Island by path on land and then connect to Lockwood Drive by fixed pier.
Ten feet of his backyard, including a grassy hummock and knobby crabapple trees (all crawling with poison ivy) went over the cliff like a carpet slipping off a clothesline.
The probability of lack of contact of the pipeline with hummock for some time period can be accepted as a design level of reliability and calculated as (Surkov, 2000):
Straggle as I might, I could not free myself from this modern day LeBrea Tar Pit until I sprawled forward, grasped a willow and pulled myself onto a hummock.