Lidar investigation of infiltration water heterogeneity in the Tamala Limestone

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dc.contributor.authorMahmud, Ken_AU
dc.contributor.authorMariethoz, Gen_AU
dc.contributor.authorTeble, PCen_AU
dc.contributor.authorBaker, AAen_AU
dc.date.accessioned2017-02-27T00:55:31Zen_AU
dc.date.available2017-02-27T00:55:31Zen_AU
dc.date.issued2014-12-15en_AU
dc.date.statistics2017-02-27en_AU
dc.description.abstractTo better manage groundwater resources in carbonate areas and improve our understanding of speleothem archives, it is important to understand and predict unsaturated zone hydrology in karst. The high level of complexity and spatial heterogeneity of such systems is challenging and requires knowledge of the typical geometry of karstic features. We present an exhaustive characterization of Golgotha Cave, SW Western Australia, based on an extensive LIDAR measurement campaign. The cave is developed in Quaternary age aeolianite (dune limestone) and contains speleothem records. We collect 30 representative 3D scan images from this site using FARO Focus3D, a high-speed 3D laser scanner, to visualize, study and extract 2D and 3D information from various points of view and at different scales. In addition to LIDAR data, 32 automatic drip loggers are installed at this site to measure the distribution and volume of water flow. We perform mathematical morphological analyses on the cave ceiling, to determine statistical information regarding the stalactites widths, lengths and spatial distribution. We determine a relationship between stalactites diameter and length. We perform tests for randomness to investigate the relationship between stalactite distribution and ceiling features such as fractures and apply this to identify different types of possible flow patterns such as fracture flow, solution pipe flow, primary matrix flow etc. We also relate stalactites density variation with topography of the cave ceiling which shows hydraulic gradient deviations. Finally we use Image Quilting, one of the recently developed multiple-point geostatistics methods, with the training images derived from LIDAR data to create a larger cave system to represent not only the caves that are visible, but the entire system which is inaccessible. As a result, an integral geological model is generated which may allow other scientists, geologist, to work on two different levels, integrating different speleothem datasets: (1) a basic level based on the accurate and metric support provided by the laser scanner; and (2) an advanced level using the image-based modelling.en_AU
dc.identifier.citationMahmud, K., Mariethoz, G., Teble, P. C., & Baker, A. (2014). Lidar investigation of infiltration water heterogeneity in the Tamala Limestone. Paper presented at the AGU Fall Meeting, San Francisco, CA, USA, 15-19 December 2014.en_AU
dc.identifier.conferenceenddate19 December 2014en_AU
dc.identifier.conferencenameAGU Fall Meetingen_AU
dc.identifier.conferenceplaceSan Francisco, Americaen_AU
dc.identifier.conferencestartdate15 December 2014en_AU
dc.identifier.govdoc7943en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm14/meetingapp.cgi/Paper/8988en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8359en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.subjectGround wateren_AU
dc.subjectLimestoneen_AU
dc.subjectCarbonatesen_AU
dc.subjectHydrologyen_AU
dc.subjectCavesen_AU
dc.subjectHydraulicsen_AU
dc.titleLidar investigation of infiltration water heterogeneity in the Tamala Limestoneen_AU
dc.typeConference Paperen_AU
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