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UID:pretalx-nss-convention-2026-NDJQPE@talks.caving.dev
DTSTART;TZID=EST:20260710T153000
DTEND;TZID=EST:20260710T160000
DESCRIPTION:The concept of the magnitude and frequency of geomorphic work i
 s central to understanding the action of erosion. Here\, I employ this con
 cept to explore the relative importance of chemical and mechanical erosion
  in carbonate channels. I first develop a conceptual framework to explore 
 how chemical and mechanical erosion rates vary with discharge. Mechanical 
 erosion processes typically activate above a threshold discharge\, whereas
  chemical erosion may be active at all discharges. Mechanical erosion scal
 es more strongly with discharge than chemical erosion. This framework prov
 ides insight into the conditions when chemical or mechanical erosion proce
 sses will dominate.\n\nI apply this framework to two different settings. I
 n J2\, part of the broader Cheve karst system in Mexico\, erosion features
  suggest a dominance of mechanical erosion. The stream is only substantial
 ly undersaturated with respect to calcite during flood flows\, and mechani
 cal erosion is more effective at those same flow levels. The few sites wit
 h clear evidence of dissolution occur upstream of breakdown chokes\, where
  water ponds during high flows.\n\nNext\, I examine slot canyons in the Oz
 arks within a limestone that underlies a sandstone. Channels narrow and st
 eepen as they flow from the sandstone onto the limestone. The mechanical s
 trength of the two rock types is similar. I hypothesize that the most effe
 ctive discharge for erosion is different within the two rock types because
  of the contrast in chemical and mechanical erosion processes. A model tha
 t incorporates these processes produces slot canyon morphologies in the li
 mestone\, similar to those observed in the field.
DTSTAMP:20260826T232900Z
LOCATION:Auditorium
SUMMARY:The influence of magnitude and frequency on the relative importance
  of chemical and mechanical erosion: Examples from J2 and slot canyons in 
 the Ozarks - 
URL:https://talks.caving.dev/nss-convention-2026/talk/NDJQPE/
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