%0 Conference Proceedings %B Abstracts with Programs - Geological Society of America %D 2005 %T Fracture characterization maps; a new type of geologic map for hydrogeologic applications %A Stephen B Mabee %A Joseph P Kopera %K #StaffPubs %K applications %K aquifers %K BEDROCK %K characterization %K classification %K crystalline rocks %K exploration %K fractures %K ground water %K hydrodynamics %K Hydrogeology 21 %K mapping %K movement %K overburden %K permeability %K potentiometric surface %K spatial distribution %K surficial aquifers %K thickness %K water wells %K water yield %X Integration of a wide array of structural data with well-field hydrologic testing is increasingly recognized as a critical step in understanding groundwater flow behavior and recharge in crystalline bedrock aquifers (Lyford et al., 2003, Walsh and Lyford, 2002). As part of its rejuvenated mapping program, The Massachusetts Office of the State Geologist has been producing fracture characterization maps as a value-added accompaniment to traditional 1:24:000-scale bedrock mapping. Fracture characterization maps reclassify bedrock into domains of varying hydrologic significance, by combining rock properties (foliation steepness and development, partings, sheeting development, etc...) and type of overburden (permeable vs. non-permeable). The goal of these maps is to better understand preferential flow directions in the bedrock and the potential hydraulic connections between surficial and bedrock aquifers. Each fracture characterization map contains several summary panels, including standard geologic map bases overlain by typical rose diagrams and stereonets displaying fracture domains and trajectories, sheeting distribution, foliation trajectories, bedrock elevations, generalized piezometric surface configuration, and overburden type and thickness with separations into permeability class. A GIS well database is also included, showing well distribution, yield, bedrock elevation, and "hot-linked" well log images. All maps and raw data are made available to the public in paper, digital (PDF) or GIS format. We believe this approach will provide hydrologists and consultants with basic framework data that will expedite and improve the planning of subsurface investigations, construction activities, and groundwater exploration. %B Abstracts with Programs - Geological Society of America %I Geological Society of America (GSA) : Boulder, CO, United States %C United States %V 37 %P 145 - 145 %8 2005/10/01/ %@ 00167592 %G eng %U https://gsa.confex.com/gsa/2005AM/finalprogram/abstract_94576.htm %N 77 %! Abstracts with Programs - Geological Society of America %0 Journal Article %J Hydrogeology Journal %D 1997 %T Analyzing outcrop-scale fracture features to supplement investigations of bedrock aquifers %A Stephen B Mabee %A Hardcastle, Kenneth C. %K #StaffPubs %K aquifers %K BEDROCK %K boreholes %K California %K dip fractures %K field studies %K fractures %K framework silicates %K ground water %K hydrodynamics %K Hydrogeology 21 %K laumontite %K Madera County California %K mapping %K mineralization %K movement %K Raymond California %K roughness %K silicates %K United States %K zeolite group %X A case study was conducted of 79 outcrops within 150 meters of the nine, 7590 m deep boreholes at the Lawrence Berkeley Laboratory (LBL) Fracture Hydrology Field Site in Raymond, California, USA, in order to make preliminary comparisons between surface fracture data and geophysical and hydrologic testing conducted in the boreholes. The orientation, trace length, spacing, roughness, planarity, associated mineralization, and domains (the geographic distribution of specific fracture sets) of 471 fractures were measured. Five families of steeply-dipping fractures and one family of shallow dipping fractures comprise 75 percent of the data and trend 52, 62, 130, 147, 173, and 35, respectively. The geographic distributions (domains) of the families, however, show the well field to be within the domains of the 62-, 173- and 35-trending families. The steeply-dipping fractures detected in the boreholes by LBL via acoustic televiewer logging trend about 65, 173, and 30 corroborating the findings of the fracture-domain analysis. Results indicate that the boreholes are located within a laumontite-mineralized area, including a steeply-dipping, 160-trending zone, 520 cm wide, of laumontite-rich pods that transects the boreholes. Independent hydrologic tests by LBL revealed a 160-trending barrier to groundwater flow between some of the boreholes, precisely where the 160-trending zone of laumontite-mineralized pods was mapped. %B Hydrogeology Journal %I Verlag Heinz Heise : Hanover, Federal Republic of Germany %C Federal Republic of Germany %V 5 %P 21 - 36 %8 1997/01/01/ %@ 1431217414350157 %G eng %U http://link.springer.com/article/10.1007/s100400050106 %N 4 %! Hydrogeology Journal %0 Journal Article %J Ground Water %D 2002 %T Correlation of lineaments to ground water inflows in a bedrock tunnel %A Stephen B Mabee %A Curry, Patrick J. %A Hardcastle, Kenneth C. %K #StaffPubs %K aquifers %K BEDROCK %K construction %K eastern Massachusetts %K Engineering geology 30 %K Framingham Quadrangle %K ground water %K hydrodynamics %K Hydrogeology 21 %K lineaments %K massachusetts %K Middlesex County Massachusetts %K Natick Quadrangle %K tectonics %K tunnels %K United States %X Lineaments derived from three image types (1:80,000 black and white, 1:58,000 color infrared, and 1:250,000 side-looking airborne radar) were compared to water-bearing features within a 9.6 km section of tunnel being constructed through foliated crystalline metamorphic bedrock in a glaciated region of eastern Massachusetts. Lineaments drawn by three observers during two independent trials (N = 9137) were reduced to three sets (one per image type) of coincident lineaments (N = 794). Thirty-five coincident lineaments crossed the tunnel. Nineteen discrete flow zones, each producing ≥ 19 L/min, were identified in the tunnel and used to quantify the reliability of lineament analysis as a method of predicting water-bearing features in glaciated metamorphic rocks. Thirteen (68%) of the flow zones correlate with coincident lineaments, six zones correlate with more than one image type, and one zone correlates with all three image types. Overall, without additional corroborating evidence, it is difficult to interpret in advance which lineaments will result in a successful correlation with water-producing zones in the subsurface and which ones will not. Most of the observed flow (80%) correlates with northwest-trending coincident lineaments; however, the majority of the flow (67%) associated with these lineaments is produced from structures that strike to the north or northeast. In addition, only 15 of the 35 coincident lineaments correlate with the flow zones, indicating that 20 lineaments are not associated with any appreciable flow. Six flow zones are undetected by the lineament analysis. %B Ground Water %I National Ground Water Association : Urbana, IL, United States %C United States %V 40 %P 37 - 43 %8 2002/02/01/ %@ 0017467X %G eng %U http://onlinelibrary.wiley.com/doi/10.1111/j.1745-6584.2002.tb02489.x/abstract %N 11 %! Ground Water