Environmental Engineering Reference
In-Depth Information
which is obscured in a closer examination. Binoculars enable closer examination of more
remote localities and land-based stereo-photographs have proved a useful method of
recording information for subsequent re-evaluation in the office.
The compilation of a geomorphological map as a basis for the succeeding stages in the
study involves the identification and location of all relevant features including changes in
slope, scarps, cracks, areas of seepage, displaced or rotated vegetation.
These features are recorded on the topographic map using one of the many systems of
symbols which have been developed. Most of the systems have a similar basis but differ in
detail depending on the site conditions experienced in the original study. The symbols
shown in
Figure 5.4
are often sufficient and commonly used. Any geomorphological map
should be accompanied by a comprehensive legend explaining the symbols.
Of particular relevance is the demarcation of boundaries of areas judged to be dis-
turbed by slope movements. Figure 5.5 is a large scale geomorphological map of a land-
slipped area above the abutment of O'Shannassy Dam.
Figure 5.5.
Large scale geomorphological plan of landslide area at O'Shannassy Dam, near Melbourne,
Australia (courtesy Jeffery and Katauskas, and MMBW).
