| Autor: |
Dan Dumitriu, Ionuț Cristea, Maria Rădoane, Ioana Perșoiu |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Springer Geography ISBN: 9783319325873 |
| DOI: |
10.1007/978-3-319-32589-7_18 |
| Popis: |
The contribution of Romanian geomorphology to the study of longitudinal profiles revolved mainly around the following question: how can the shape of long profiles be interpreted in order to identify the evolutionary traits of landforms? The approaches to providing an answer to this question can be ranked into following categories: longitudinal profiles and the knick-points and knickzones approach; tectonic and lithologic control on the evolution of the drainage network; longitudinal profiles concavity related to river age and channel bed material grain size. A range of new methods for determining river gradients, as well as modern facilities for processing large databases were employed in this study, assisting us in demonstrating that tectonics prevailed over lithology (as well as other secondary factors) in generating knickzones along longitudinal profiles. Furthermore, the differential uplift of major Carpathian structural units (e.g., the Carpathian flysch ot the peri-Carpathian molasse) was detected in the distribution of stream gradient index. Tectonic movements established the general evolution pattern of the drainage network and prompted rivers to constantly adapt in order to reach the equilibrium shape of longitudinal profiles. Regardless of age, the shape of longitudinal profiles continually adjusted to ensure that geomorphological work is performed by rivers under conditions of high variability of tectonic movements and geomorphic time. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
