UMass Sesquicentennial

Fracture characterization maps; a new type of geologic map for hydrogeologic applications

TitleFracture characterization maps; a new type of geologic map for hydrogeologic applications
Publication TypeConference Proceedings
Year of Publication2005
AuthorsMabee, SB, Kopera, JP
Conference NameAbstracts with Programs - Geological Society of America
Pagination145 - 145
Date Published2005/10/01/
PublisherGeological Society of America (GSA) : Boulder, CO, United States
Conference LocationUnited States
ISBN Number00167592
Keywords#StaffPubs, applications, aquifers, BEDROCK, characterization, classification, crystalline rocks, exploration, fractures, ground water, hydrodynamics, Hydrogeology 21, mapping, movement, overburden, permeability, potentiometric surface, spatial distribution, surficial aquifers, thickness, water wells, water yield

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.

Short TitleAbstracts with Programs - Geological Society of America
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The MA Geological Survey
Department of Geosciences
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University of Massachusetts
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Amherst, MA 01003-9297

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