| Popis: |
Use of a borehole camera in a hydrologic investigation, can yield information that may not be otherwise obtainable. The camera permits confirmation of stratigraphy, fracture and bedding plane separation locations, ground water inflow zones, fracture accentuation due to mine subsidence, and other features. A borehole camera also permits viewing of well bore features that otherwise may be unknown to exist, such as the conditions of the well bore, casing, and pumping system, historic water levels indicated by staining or corrosion, presence or absence of bacterial growths, existence of other organisms, the presence of foreign objects, and influx of gases. Combined with other instruments, the borehole camera can greatly enhance the information derived from either individually. A camera has been used in conjunction with a pump or an electrical specific conductance meter to determine the location of water-bearing and non-water bearing fractures. The flow direction of water within the hole has been determined using the camera with a neutral-buoyancy tape attached. Subsidence features (e.g., fractures, sheared casing, and borehole offsets) have been documented using a borehole camera. |
