| Autor: |
POP, Olimpiu, HORVÁTH, Csaba, HOLOBÂCĂ, Iulian Horea, RĂCHITĂ, Ionela Georgiana, IRIMUŞ, Ioan Aurel, ALEXE, Mircea, BUZILĂ, Liviu |
| Předmět: |
|
| Zdroj: |
Revista de Geomorfologie; 2023 Special Issue, Vol. 25, p23-23, 1p |
| Abstrakt: |
Mining activities for sulfur-rich ore extraction and processing resulted in significant morphological changes in Călimani Mountains (Eastern Carpathians, Romania). Hydrogeomorphic processes, i.e., debris flows originating in the spoil heap area produced in the last decades an increasing volume of sediments transferred along the stream channels. In this mining area, very limited information exists about the frequency and spatial extent of past debris flow activity. Dendrogeomorphic methods allow to document the spatial extent and temporal frequency of debris-flow activity with an annual or even a seasonal resolution. This dating method is based on the identification of growth anomalies (e.g., scars) recorded by the annual rings of trees disturbed by debris flows. The purpose of this study is to apply dendrogeomorphic methods to reconstruct debris flow chronology in mining area of Cǎlimani Mts. To this end, trees exhibiting clear external signs of mechanical disturbances (stem wounding) related to past debris-flow activity were sampled. The analysis of growth anomalies, e.g., scars, identified within the annual rings of the disturbed trees allowed to precisely date the occurrence year and season of past debris-flows events. Reconstructed debris flow frequencies and return periods spanning the period 1970–2021 indicate an increase of debris flow activity over the last two decades. Reconstructed debrisflow history will further be coupled with the analysis of spatio-temporal patterns of precipitation in the attempt to identify debris-flows’ triggering precipitation thresholds in the study area. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
