|
REMOTELY SENSED and FIELD DATA ANALYSIS with a GIS to SEARCH for BEDROCK-FRACTURE ZONES in SOUTHERN NEW HAMPSHIRE
17th Annual Northeast Arc Users Group Conference
November 3-6, 2002, Bretton Woods, NH
James R. Degnan, U.S. Geological Survey
Richard Bridge Moore, U.S. Geological Survey
Stewart F. Clark, Jr., U.S. Geological Survey
Abstract
The U.S. Geological Survey has been assessing ground-water availability and flow in fractured bedrock aquifer systems for several water supply and water-quality projects using a geographical information system (GIS) to analyze various spatial datasets. Fractured-bedrock assessments, at regional and local scales, require the integration of several data sources, data capture, and processing techniques. In these projects, remotely sensed data sources included satellite imagery and stereo aerial photography for the identification of photo-lineaments. Digital orthorectification was used to convert the lineaments plotted on these sources into spatially corrected and referenced GIS datasets. Field-based data collection included fracture measurements at outcrops and geophysical surveys, both of which were geo-referenced using the Global Positioning System (GPS). These georeferenced fracture measurement and lineament datasets were then collectively analyzed using GIS techniques to identify fracture-correlated lineaments. Surface geophysical surveys were utilized to detect anomalies that may indicate bedrock fracture zones in the vicinity of fracture-correlated lineaments that are associated with conductive zones for ground-water movement.
U.S. Geological Survey  NH-VT Water Science Center Home Page |