| Popis: |
About 7.6 million depth measurements were collected along more than 930 miles (1,690 kilometers) of survey transects (fig.2) during the data-collection phase of this study. Sound-velocity profiles were obtained in conjunction with the bathymetric data to provide time-of-travel corrections to the depth calculations. Data were processed with commercial hydrographic software and exported into geographic information system (GIS) software for mapping and calculation of area and volume. Because of the shallow nature of the lake and the limitations of the instrumentation, contours above an altitude of 4,193 feet (1,278 meters) were digitized from existing USGS 1:24,000-scale topographic quadrangle maps. A triangulated irregular network generated from the bathymetric data and digitized contours were used for the calculations of area and volume. |
