A Newsletter of the Cave & Karst Programs of The
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Geologic Resources Division Cave and Karst Programs National Park Service U.S. Department of the Interior Inside Earth Volume 8 Number 2 Fall 2005 This Issue Edited by Rodney D. Horrocks, Wind Cave National Park A Newsletter of the Cave & Karst Programs of the National Park Service Caption: Stan Allison collecting microbiological samples during the October camp trip from corrosion residue in the southeastern end of Jewel Cave in a place called The Addendum. Table of Contents: Featured Articles: Dust Deposition Along The Off-Trail Routes In Wind Cave, Wind Cave National Park, Marc Ohms 12 Park Updates (Listed alphabetically): Buffalo National River, Chuck Bitting 15 Jewel Cave National Monument; Andy Armstrong 15 Oregon Cave National Monument, John Roth 16 Wind Cave National Park, Rod Horrocks & Marc Ohms 16 Inside Earth Vol. 8 No. 2 Fall 2005 To determine the level of dust deposition, the dust particles were counted on each dish. Using graph Feature Article: paper, a template was created on which the dish was divided into four quadrants. Ten squares were then DUST DEPOSTION ALONG THE OFF- randomly selected in each quadrant, which were used to count dust particles for all samples. The number of TRAIL ROUTES dust particles reported is the total for the 40 squares IN WIND CAVE, counted on each dish, and termed the “sample area.” WIND CAVE NATIONAL PARK A microscope was used to magnify the samples in order to increase accuracy in the counting procedure. By Marc Ohms, Physical Science Technician RESULTS Wind Cave National Park With an average of 87 particles per sample area, the Bishop Fowler’s Loop had the lightest dust deposition INTRODUCTION of all the trails monitored during this study. Although, People have been exploring Wind Cave for well over this trail is primarily used for recreational caving, in 100 years and during that time established many trails 2004 there were no recreational caving trips permitted. throughout the cave. Historically, string was left behind Without people traveling along this trail over the study as a marker to guide the explorers deeper into the period the dust that accumulated was only from natural cave and back to the surface. Some of the historic airflow. trails are now paved with concrete and lit for tours for the general public. The blue flagged trail, which leads to the Lakes, saw an average of 129 particles per sample area. With the Modern day explorers use plastic flagging tape instead background being 90 particles, the dust along this trail of string to mark trails. Not every route or passage is is only slightly above natural conditions. Bimonthly marked; instead only those routes which are trips were taken along this trail to conduct groundwater established as main trails to significant parts of the level monitoring, with a total of 20 people participating cave are flagged. Each trail has a different color of on all the trips. On average each person deposited flagging tape to differentiate one trail from the other. 1.95 dust particles in the sampling area (total average This technique of marking the trails was started in 1990 dust particles minus background divided by number of and was based on the system being used at Jewel people.) It should be noted that each trip passed the Cave National Monument. Within Wind Cave there are sites twice; once on the way into the cave and once on eight flagged trails that are used by cavers conducting the way out. Therefore each person deposited 0.97 survey and research in the cave. There is an particles per pass. additional flagged trail that is used for a caving tour for the general public. The pink and black flagged trail leaves the Caving Tour near survey station CL18 and winds through the The park staff has noticed an accumulation of dust Colorado Grotto Section to Mammoth Canyon. There along the trails that appears to be unnatural. It was were 3 trips during the course of the study period with obvious that dust was being deposited; the question a total of 10 people. The three trips only went past the was how much was natural and how much was caused first two sites, Thomas Paine and Xerox Room. There by cavers. were no trips past the third site in the Citadel during the study period, which predictably had the lowest dust METHODS accumulation with 116 particles. The background for The methodology used during a similar study along the the trail was 120 particles. The average accumulation Candlelight Tour route (Ohms 2003) was replicated of the three sites was 260 particles per sample area, during this study. To determine how much dust is with each person depositing 14.0 particles on the being deposited, a series of three Petri dishes were sampling area. However, it should be noted that each placed in three locations along each trail. A single dish trip passed the sites twice; once on the way into the was placed nearby but off of the trail to serve as a cave and once on the way out. This means 7.0 background. Of the eight trails, five were chosen for particles were deposited per pass. This route had the this study to obtain a variety of typical annual usage. highest per person deposition during the study. The The dishes were in place for one year. On the Caving site in Thomas Paine had the highest accumulation Tour, two sets of dishes were used, one during the with 502 particles per sample area. Thomas Paine is a summer months when tours were given and one set small series of crawls connecting the Colorado Grotto during the winter months when no tours were given. Section with the rest of the cave. Airflow through this The second set of dishes was placed in the same passage is greater than at the other two sites along locations as the first set to ensure comparability. this trail, and this site also consists of much smaller passages. The increased airflow could be the reason 12 Inside Earth Vol. 8 No. 1 Spring 2005 for the increased dust levels and may indicate high substantially greater (see figure 2.) Simply put, the natural levels for this passage. It also might be that more people, the more dust being deposited. cavers stir up more dust while crawling and squeezing than they do while traversing larger passages. AVERAGE PARTICLES PER PERSON The red and white flagged trail starts in Rome and ends in the Western Fringe area, north of Half-Mile 7.00 Hall. Besides the Caving Tour, this is the most 6.00 frequently used and by far the longest trail. During the study period there were a total of 30 trips with 103 5.00 people. The background level for this trail was 180 4.00 particles, while the average for the trail was 466 particles per sample area. However, only the site at 3.00 the Frostline saw all 30 trips; the other two sites, at the 2.00 Chinese Mushroom and BB29, only saw 18 trips with 63 people. It should be noted that each trip passed the 1.00 sites twice; once on the way into the cave and once on 0.00 the way out. For the latter two sites each person Blue Pink/Black Red/White Caving Tour- summer deposited 3.08 particles on the sampling area; 1.54 Figure 1 particles per pass. The Frostline had the highest accumulation with 650 particles per sample area, but saw nearly twice the visitation of the other two sites. AVERAGE DUST ACCUMULATIONS Each person deposited 4.56 dust particles on the sampling area at this site, but only 2.28 per pass. 1800 1600 The Caving Tour is currently being offered daily from 1400 May to September with a maximum of 10 visitors per 1200 tour, with one leader. During the 2004 summer season 1000 there were 74 tours with 475 visitors plus 74 leaders. 800 There also were 20 trips taken to train leaders with an additional 40 people, for a total of 589 people during 600 the study period (Laycock 2005). This trail is a loop, 400 therefore each group passed by the sites only once. 200 During the summer period, the Caving Tour had dust 0 Bishop Fowler's Blue Pink/Black Red/White Caving Tour- Caving Tour- accumulation more than 10 times higher than that of winter summer the winter period, and four times that of any other trail. Figure 2 The winter samples averaged 157 particles per sample area while the summer samples averaged 1,739 particles. On average each person deposited 2.69 POTENTIAL IMPACTS particles on the sampling area. The Newspaper Room The rate of visual degradation by dust fall in the cave is had the highest accumulation of any site during the imperceptibly slow, so a cave manager may be study with 2,269 particles compared to 157 particles unaware that damage is occurring (Michie 1999). during the winter period, with each person depositing Michie states that ten years is the time scale for 3.59 particles. The site at survey station CL18 was 8 serious degradation. There are several resources that feet above the floor while the other two sites were at or may be affected: cultural, geological, biological, and near floor level. This was done to determine if the dust visitor satisfaction. was being deposited at height. The CL18 site had a summer accumulation of 1,274 particles compared to a Cultural: Dust accumulating on cultural artifacts can winter accumulation of 179 particles. affect those resource in several ways. When dust accumulates on fragile resources such as newspaper and string, the dust holds additional moisture, which The pink and black trail had the highest per person causes the paper or string to deteriorate more readily.