What is a Karst Topography Karst is a three dimensional soluble - - PowerPoint PPT Presentation

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Aug 20, 2023 357 likes •810 views

What is a Karst Topography Karst is a three dimensional soluble rock landscape that develops by the dissolving action of water on soluble bedrock. Include caves, epikarst exposure, sinkholes, sinking streams, springs Can have

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What is a Karst Topography

Karst is a three dimensional soluble

rock landscape that develops by the dissolving action of water on soluble bedrock.

Include caves, epikarst exposure,

sinkholes, sinking streams, springs

Can have recreational, cultural and

biodiversity significance

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Interaction of Karst System

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Karst Routine Monitoring

Priority Evaluation Question

“Are current forest practices adequately

protecting and maintaining the structure, function and ecological integrity of the surface and subsurface elements of karst systems”

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Karst Sample Units and Selection

Criteria for samples units

Random, 1996-2006 Within 100 m of block or road from 500m

utside of block

KSU sample of each feature, looking for

indicators for location of karst in block

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Environmental factors

Removal of native forest cover Reduction of shade Change to native lower plant communities Soil/ground disturbance Post-harvest windthrow Introduced materials Burning Other

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Karst Inventory Location and Distribution

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Karst locations

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Karst Sample Unit

Cutblock and Karst Potential

Unit intersection

Eligible areas for sampling

include inside cutblock, 100m around cutblock and roads

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Karst Sample Unit – opening information

Record information about the block

and Karst Sample Unit,

Information may be obtained from a

SP or Karst Assessment

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Karst Field Data Card

Records indicator information

such as

Windthrow,soil disturbance,

introduced material, burning, retention,

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Karst Field Data Card

Summary of indicator status for

individual features

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Karst Summary Card

Summary of indicators for

entire sample unit

Level of risk
Professional opinion

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Karst Assessment Map Showing Features

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Feature is a sinkhole with a cave

entrance. Retention Patch and Machine

free Zone

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Cave entrance within the sinkhole.

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Feature is a Shaft located under an old log. Trying to measure depth 5+ meters

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Feature is a Shaft that was missed during Karst assessment, Logging engineers located and a machine free zone established.

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Feature is an exsurgence The channel originates at a sinkhole-like feature approximately 2 m in diameter and 1 m relief.

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How did this get here??

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Joint field session DCR and DNI staff. Feature is a localized limestone

bluff. Bluff is approximately 30m x 5 m.

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The feature is a concave depression that occurs along a vertical section of the bluff. The feature is arc shaped approximately 3m x4 m

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Feature is a sinkhole approximately 4 m x 2m x 1.5 m. Sinkhole is poorly managed, filled with logging slash and soil disturbance

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Sinkhole approximately 4 m diameter and 2.5 m relief. Managed with a modified retention patch and a machine free zone.

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An exsurgence from the soil/bedrock. Ephemeral in nature. Located

utside of block.

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Feature is grike, 10m long, 1 m wide and more than 1 m

deep. Machine free zone and

a modified retention patch.

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Safety issue. Underground cavity was covered by thin layer of roots and moss.

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Epikarst feature located outside of block and exposed by wind throw.

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Sinkhole with a disappearing stream and a cave entrance. Retention patch surrounding feature blew over.

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Sinkhole and cave entrance buried by windfall. Retention patch approximately 1.5 ha. With 90% blow down.

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Sinkhole with side slope disturbance. Stream on the right