ANALOGS OF YUMA TERRAIN IN THE SOUTHWEST UNITED STATES DESERT. VOLUME 1
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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To evaluate the adequacy and suitability of the Yuma Test Station as a test site representative of world desert conditions, it was necessary to determine to what extent Yuma terrain types occur in the Southwest United States SWUS desert and other world deserts. For valid comparisons, a uniform system of describing, mapping, and comparing desert terrain is necessary. In Vol II of this report, both the Yuma Test Station and the SWUS desert are mapped in terms of general geometry, ground, and vegetation factors. The data mapped for each terrain factor in each desert area were then synthesized to establish the degree of analogy of a particular SWUS area with selected portions of the Yuma area. Final terrain-type analog maps were prepared by superimposing the geometry, ground, and vegetation analog maps and stratifying the resulting combinations. Highly analogous SWUS desert tracts exhibit combinations of terrain-factor mapping units found at Yuma, and the degree of analogy decreasses as the similarity to such combinations decreases. Vol I of the report summarizes the analogy, and describes and discusses the factors used and the mapping technique. Appendix A in a general disucssion of the philosophy and problems associated with terrain analysis and comparison.