Report upon a Survey of Karst Landforms around Norman Wells, Northwest Territories for the NWT Protected Areas Strategy Department of Environment and Natural Resources Government of the Northwest Territories
Karst geomorphology is the study of natural landforms and caves created by the dissolution of comparatively soluble rocks. Karst hydrogeology studies the flow of ground waters through the karst rocks, via the systems of caves and micro-caves (mouse-sized) created by solution along paths through frac...
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ftusouthflorida:oai:digitalcommons.usf.edu:kip_articles-5528 2023-07-30T04:05:55+02:00 Report upon a Survey of Karst Landforms around Norman Wells, Northwest Territories for the NWT Protected Areas Strategy Department of Environment and Natural Resources Government of the Northwest Territories Ford, Derek 2008-01-01T08:00:00Z https://digitalcommons.usf.edu/kip_articles/4529 https://www.enr.gov.nt.ca/sites/enr/files/karst_survey_report_2008_full.pdf unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/kip_articles/4529 https://www.enr.gov.nt.ca/sites/enr/files/karst_survey_report_2008_full.pdf KIP Articles Protected Areas Strategy Environment Natural Resources Government Northwest Territories text 2008 ftusouthflorida 2023-07-13T23:23:51Z Karst geomorphology is the study of natural landforms and caves created by the dissolution of comparatively soluble rocks. Karst hydrogeology studies the flow of ground waters through the karst rocks, via the systems of caves and micro-caves (mouse-sized) created by solution along paths through fractures in the rocks. At the surface the principal types of karst landforms represented in the region around Norman Wells are: (i) at small scale, karren – solutional pits, runnels and micro-shafts developed on bare rock surfaces or under shallow soil cover. Individuals are rarely greater than a metre or two in size but they usually occur in clusters or wider spreads that may cover many ha or even square km. (ii) at intermediate scale, sinkholes – ranging from a few metres to hundreds of metres in diameter and up to 100 metres or more in depth. There are two principal origins – first by surface runoff water dissolving a funnel-shaped depression downwards that delivers flow to the underground cave systems – second, by collapse of a cave upwards to the surface. Both types are well represented in the Norman Wells region. (iii) at large scale, dry valleys and gorges where dissolution has captured original surface streams and diverted them underground with the result that surface channels are abandoned either permanently or at all times except high flood periods when there may be overflow. Turloughs and poljes are large, topographically closed depressions drained underground by sinkholes within them, that are subject to periodic flooding when the underlying caves become swamped with water. Both may accumulate alluvium that forms central flat floors around the sink points. Turloughs are rarely greater than 2-3 km in length. Poljes may be larger, in part because the flood waters are able to dissolve benches into the hills of soluble rock enclosing the depression. Most types of rock are essentially insoluble in the very mildly acidic waters that occur naturally on the surface of the Earth. As a consequence, karst landforms and s Text Northwest Territories University of South Florida St. Petersburg: Digital USFSP Bare Rock ENVELOPE(-45.589,-45.589,-60.704,-60.704) Norman Wells ENVELOPE(-126.833,-126.833,65.282,65.282) Northwest Territories |
institution |
Open Polar |
collection |
University of South Florida St. Petersburg: Digital USFSP |
op_collection_id |
ftusouthflorida |
language |
unknown |
topic |
Protected Areas Strategy Environment Natural Resources Government Northwest Territories |
spellingShingle |
Protected Areas Strategy Environment Natural Resources Government Northwest Territories Ford, Derek Report upon a Survey of Karst Landforms around Norman Wells, Northwest Territories for the NWT Protected Areas Strategy Department of Environment and Natural Resources Government of the Northwest Territories |
topic_facet |
Protected Areas Strategy Environment Natural Resources Government Northwest Territories |
description |
Karst geomorphology is the study of natural landforms and caves created by the dissolution of comparatively soluble rocks. Karst hydrogeology studies the flow of ground waters through the karst rocks, via the systems of caves and micro-caves (mouse-sized) created by solution along paths through fractures in the rocks. At the surface the principal types of karst landforms represented in the region around Norman Wells are: (i) at small scale, karren – solutional pits, runnels and micro-shafts developed on bare rock surfaces or under shallow soil cover. Individuals are rarely greater than a metre or two in size but they usually occur in clusters or wider spreads that may cover many ha or even square km. (ii) at intermediate scale, sinkholes – ranging from a few metres to hundreds of metres in diameter and up to 100 metres or more in depth. There are two principal origins – first by surface runoff water dissolving a funnel-shaped depression downwards that delivers flow to the underground cave systems – second, by collapse of a cave upwards to the surface. Both types are well represented in the Norman Wells region. (iii) at large scale, dry valleys and gorges where dissolution has captured original surface streams and diverted them underground with the result that surface channels are abandoned either permanently or at all times except high flood periods when there may be overflow. Turloughs and poljes are large, topographically closed depressions drained underground by sinkholes within them, that are subject to periodic flooding when the underlying caves become swamped with water. Both may accumulate alluvium that forms central flat floors around the sink points. Turloughs are rarely greater than 2-3 km in length. Poljes may be larger, in part because the flood waters are able to dissolve benches into the hills of soluble rock enclosing the depression. Most types of rock are essentially insoluble in the very mildly acidic waters that occur naturally on the surface of the Earth. As a consequence, karst landforms and s |
format |
Text |
author |
Ford, Derek |
author_facet |
Ford, Derek |
author_sort |
Ford, Derek |
title |
Report upon a Survey of Karst Landforms around Norman Wells, Northwest Territories for the NWT Protected Areas Strategy Department of Environment and Natural Resources Government of the Northwest Territories |
title_short |
Report upon a Survey of Karst Landforms around Norman Wells, Northwest Territories for the NWT Protected Areas Strategy Department of Environment and Natural Resources Government of the Northwest Territories |
title_full |
Report upon a Survey of Karst Landforms around Norman Wells, Northwest Territories for the NWT Protected Areas Strategy Department of Environment and Natural Resources Government of the Northwest Territories |
title_fullStr |
Report upon a Survey of Karst Landforms around Norman Wells, Northwest Territories for the NWT Protected Areas Strategy Department of Environment and Natural Resources Government of the Northwest Territories |
title_full_unstemmed |
Report upon a Survey of Karst Landforms around Norman Wells, Northwest Territories for the NWT Protected Areas Strategy Department of Environment and Natural Resources Government of the Northwest Territories |
title_sort |
report upon a survey of karst landforms around norman wells, northwest territories for the nwt protected areas strategy department of environment and natural resources government of the northwest territories |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2008 |
url |
https://digitalcommons.usf.edu/kip_articles/4529 https://www.enr.gov.nt.ca/sites/enr/files/karst_survey_report_2008_full.pdf |
long_lat |
ENVELOPE(-45.589,-45.589,-60.704,-60.704) ENVELOPE(-126.833,-126.833,65.282,65.282) |
geographic |
Bare Rock Norman Wells Northwest Territories |
geographic_facet |
Bare Rock Norman Wells Northwest Territories |
genre |
Northwest Territories |
genre_facet |
Northwest Territories |
op_source |
KIP Articles |
op_relation |
https://digitalcommons.usf.edu/kip_articles/4529 https://www.enr.gov.nt.ca/sites/enr/files/karst_survey_report_2008_full.pdf |
_version_ |
1772818227344179200 |