期刊名称：Studia Universitatis Babeş-Bolyai: Geographia
印刷版ISSN：1221-079X
电子版ISSN：2065-9571
出版年度：2012
期号：1
语种：English
出版社：Cluj University Press
摘要：Geomorphologic Aggradation,Expression of the Climatic Changes -Situations and Structures Specific for Romania – Transylvania. The geomorphostructures,when defined as formations of accumulation with dynamic and grading organisation,are considered to be the expression of the factors involved in the dislocation,transport and redepositing processes. Geomorphologic sensitivity plays,in this case,an essential role. The formation,the increase or decrease of the morphostructures set up through aggradation or degradation phenomena,give hints about the changes of the factors responsible with the dislocation,transport and depositing. At the same time,the changes in grading,as well as those in the mineralogical composition and configuration of the morphostructures,illustrate the differentiation in time and space of the control variables actions. The study of some geomorphostructures in the Transylvanian Basin,such as alluvial beds,deposit fan structures (gullies,torrents),basal glacisses,lake sediments,evidentiated the role of the climate as a relief factor. As regarding the slopes,due to an accelerate erosion,an increase of the alluvial fans and of the basal glacises was noticed. The lake basins in the Transylvanian Plain are also characterized by an increase in the sedimentary deposits as a result of the inputs from the surrounding areas. On the whole,the morphostructures dimension,referring both to their volumes and geometry (configuration),is influenced by the various material inputs and by differences in the dynamic (transport) process (slopes and river beds),all these in the context of a general increase of the “dryness” (aridity) phenomenon. The rhythmgrams of the various sediments (lake,fluvial) clearly illustrate the sequence of the climatic manifestations,as well as the general trend towards heating and dryness (aridization).
