Solving Three Problems of Exploration and Engineering Geology by Digital Terrain Analysis
In the smooth-surface approximation, local accumulation of a flow is controlled by relative deceleration and convergence. Flow deceleration is determined by vertical curvature of the land surface, while flow convergence is controlled by horizontal curvature. There is a concurrent action of flow convergence and relative deceleration at areas marked by negative values of both of these curvatures. These areas are said to be relative accumulation zones. We describe basic principles of applying maps of relative accumulation zones to solve three problems of exploration and engineering geology: (1) exploration of alluvial placers; (2) prediction of landsliding on reservoir shores; and (3) prediction of soil degradation and contamination along pipelines. The deposition of placer minerals is most likely to occur in relative accumulation zones with slope steepness below 3°, all other factors being equal. The activation of slope instability is most probably to occur in relative accumulation zones with slope steepness beyond 15°, which are adjacent to, upslope the reservoir water level. Soil degradation (waterlogging and salinisation) may be observed in relative accumulation zones adjacent to, upslope a pipeline. After the pipeline failure, one can use a map of specific catchment area to determine paths of lateral migration of petroleum in the landscape. Petroleum products are most likely to concentrate in relative accumulation zones situated along a flow line originating at a pipeline hole. To refine the prediction, one should analyse accumulation zone maps together with geological, geophysical, geochemical, soil, plant, and remotely sensed data as well as with models of other topographic variables
Disclaimer/Regarding indexing issue:
We have provided the online access of all issues and papers to the indexing agencies (as given on journal web site). It’s depend on indexing agencies when, how and what manner they can index or not. Hence, we like to inform that on the basis of earlier indexing, we can’t predict the today or future indexing policy of third party (i.e. indexing agencies) as they have right to discontinue any journal at any time without prior information to the journal. So, please neither sends any question nor expects any answer from us on the behalf of third party i.e. indexing agencies.Hence, we will not issue any certificate or letter for indexing issue. Our role is just to provide the online access to them. So we do properly this and one can visit indexing agencies website to get the authentic information.