چکیده:
The morphology of glacial valley can be described in terms of power law or quadratic equations fitted to valley cross-profiles. These two models are used to study the cross-profiles of 86 valley cross-profiles in the Zardkuh Mountain in order to understand the evolutional patterns of valleys. Assessment of using the power law function indicates that b values for both valley sides range from 1.0 to 2.5 with values showing an increase within this range as valley floor altitude increases. Analysis of b and FR of the valleys in the Zardkuh Mountains does not fit in with the Rocky Mountain model of Hirano and Aniya, but has a similar trend to the Patagonia-Antarctica model. The analyses also show a more efficient widening process in higher altitudes and a more efficient over deepening of valleys in lower altitudes. The results of the analysis show a relatively efficient glacial process in the elevated region of the Zardkuh. Application of quadratic function show similar conclusions and also indicates that most of the valleys are roughly symmetrical in the cross-profile. Apparently, greatest degree of "U-ness" showing glacial modifications was observed in altitudes above ELA during Last Glacial Maximum.
خلاصه ماشینی:
"The statistical parameters for Power Law coefficients and some morphometric factors (For example, FR and W) for valley cross profiles of both clusters on the northern slopes of Zardkuh are shown in Table 2.
Figure 11a shows the b and VFA regression relationship for valley cross profiles on the SW flanks of Zardkuh Mountain.
Statistical parameters of valley floor altitude (VFA), form ratio (FR), width of valley (W) and power law and quadratic model coefficients (b, A and C) of a cluster of valley cross profiles on the northern slope of Zardkuh Mountain Statistical Parameters VFA (m asl) C (x1000) W (m) b |A| FR (View the image of this page) Fig. 11.
The means of c values (x1000) for valley cross profiles (the NE flanks of Zardkuh) with floor altitudes above (ca) and below (cb) the altitude of the ELALGM (3100 m asl) have also been calculated (Table 3).
Similar analyses have not shown any significant relationship between b and floor altitudes in the first cluster of valley cross profiles on the NE flanks.
On the other hand, the statistical analyses have shown a relatively strong significant positive relationship between b and VFA in the second cluster of valley cross-profiles on the NE flanks of the Zardkuh.
Similar analysis for cross profiles on the NE flanks of Zardkuh demonstrates a moderate positive correlation indicating that b tends to increase as valley floor altitude increases."